記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2020 IEEE. Due to the lack of system inertia driven by the increasing integration of renewable energy, a virtual synchronous machine (VISMA) concept has been developed to provide backup inertia, maintaining microgrid stability and resiliency. To enhance an inertia support in regards to frequency stability, this paper proposes a novel control approach using multiple VISMAs with different P-f droop characteristics. This approach can effectively enhance frequency stability of the microgrid under the situation of low system inertia. The stability difference and efficacy between single VISMA and multiple VISMAs are investigated over microgrid performance with contrastive scenarios. Transient and steady-state responses are also compared. The analysis results reveal that the multiple-VISMA configuration suppresses frequency oscillation better than the single VISMA configuration, maintaining stable microgrid operation. This work also provides a recent overview of a practical multiple-VISMA system in regards to frequency stability improvement.

DOI： 10.1109/PESGM41954.2020.9281491

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2020 Elsevier B.V. Recently, the large-scale photovoltaic (PV) penetration brings serious issues for system operators in monitoring and maintaining grid stability. The intermittent power output and loss of inertia property from high PV penetration critically affect the balance between generation and demand. These issues lead to larger frequency oscillations, generation tripping, and cascading failures. To overcome these challenges, this paper proposes an advanced application of phasor measurement units (PMUs) for monitoring dynamics of the system in the presence of high PV penetration. During such penetration, the data-driven analysis of the rate of change of frequency (ROCOF) is of great importance, reflecting the system stability. This approach is first demonstrated on Kyushu Island, and PMUs are installed at the domestic supply side. The contrastive scenarios of high-resolution PMUs recorded in each region are analyzed against different levels of PV penetration. The results reveal that monitoring system frequency and ROCOF variations not only indicate the oscillatory behavior of the grid, but also provide useful information for the wide-area dynamic stability. This paper also offers a recent overview of large-scale PV penetration infeed on frequency of the 60 Hz Japan power system, and it can be useful for improving a range of diagnostic/monitoring and control functionalities.

DOI： 10.1016/j.epsr.2020.106393

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2020 IEEE. Virtual inertia control has recently come into focus for various applications, reaching from inertia emulation for renewable power plants to frequency stabilization in microgrids. Supply of virtual inertia is achieved by an inverter based virtual synchronous machine (VISMA), or virtual synchronous generator (VSG), emulating a synchronous generator's behavior. Until today, virtual inertia control for power grid frequency stability has mainly been tested on either islanded microgrids, or grid-connected power systems. This research compares both situations. A model of a three-area power system is presented. Based on this model, it is shown, that the dynamic behavior of a multi-area power system comprised of island-optimized areas can lead to stability issues. Nevertheless, benefits of connecting islanded grid areas are not only increased redundancy, but also decreased amplitudes of frequency transients and reduced stress on mechanical components, as is shown by simulations. Therefore, in a situation where areas are islanded, the possibility of a connection to neighboring areas is important. It is proposed that connection stability issues may be resolved by virtual inertia control integrating damping properties. When combining virtual inertia and virtual damping, the unoptimized three-area system possesses a dynamic behavior superior to that of the optimized islanded system of equivalent configuration.

DOI： 10.1109/EEEIC/ICPSEurope49358.2020.9160690

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2020 IEEE. During the last decades, photovoltaic (PV) panels have been widely installed in Japanese residential areas to achieve clean and renewable energy. This work employs DSM (Digital Surface Model) layers to extract important elevations, such as trees and buildings, in conjunction with assumptions of cloud movement processes from GIS (Geographic Information System) to obtain realistic solar power affected by solar radiation shading on the PV panel. With GIS technology, the solar radiation shading effects are combined with distribution system modeling to observe the significant impact of shadows in the overall distribution system. Moreover, this research can facilitate a more effective distribution system planning by evaluating the influence of PV power variations, assuming a large number of installations.

DOI： 10.1109/EEEIC/ICPSEurope49358.2020.9160547

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記述言語：英語   掲載種別：記事・総説・解説・論説等（商業誌、新聞、ウェブメディア）

© 2020, Springer Nature Switzerland AG. This chapter provides a digital scheme of frequency control and over/underfrequency relay (OUFR) protection for an islanded microgrid (μG) considering high penetration of renewable energy sources (RESs). Reducing system inertia by replacing synchronous generators with a large amount of RESs causes undesirable influence on system frequency stability, leading to weakening of the μG. In addition, sudden changes in load and short circuits cause large frequency fluctuations that threaten the system security. Therefore, this chapter proposes a coordination scheme between the digital frequency controller, which is designed based on Tustin’s technique, and the digital OUFR, which operates for both conditions of over- and underfrequency, to protect the power system against high frequency variations. To evaluate the effectiveness of the proposed digital coordination scheme, the simulation results of the studied islanded μG are executed by MATLAB software. Thus, the obtained results emphasized that the proposed coordination scheme can effectively handle several disturbances and high system uncertainty. Moreover, it can regulate the μG frequency and guarantee robust performance to maintain the dynamic security of low-inertia islanded μG.

DOI： 10.1007/978-3-030-33455-0_3

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記述言語：英語   掲載種別：記事・総説・解説・論説等（商業誌、新聞、ウェブメディア）

© 2020, Springer Nature Switzerland AG. In view of the analysis and investigations presented, the main conclusions can be summarized as follows: 1. This book has proposed new frequency control techniques based on SMES system, virtual inertia control, and VSG for frequency stability enhancement of RPS considering high penetration level of RESs. 2. A new coordination of the secondary frequency control (i.e., LFC) and the SMES technology using a new optimal PID controller-based MSA has been proposed to enhance the frequency stability of the EPS concerning HWPP under the impact of different load profiles, random load variation, wind power fluctuations, and system uncertainties. 3. A suitable inertia control technique could be applied together with ESSs to emulate additional inertia power to the community or power system, improving system inertia and eliminating the stability issues. Therefore, this book has proposed a novel concept of frequency control incorporating a virtual inertia controller to emulate virtual inertia into the RPS control loop, thus stabilizing RPS frequency during high penetration of RESs. 4. This book has proposed a new frequency control strategy based on VSG, which emulates the characteristics of a real synchronous generator that are as follows: the inertia and damping properties through the concept of virtual rotor as well as frequency control loops (i.e., primary and secondary frequency control) through the virtual primary and secondary control, to compensate the reduction in system inertia that results from adding more RESs (e.g., non-inertia sources), thus stabilizing the system frequency during high penetration of RESs. 5. The proposed frequency control strategies have coordinated with digital OUFR in RPSs for improvement of the frequency stability and preservation of the dynamic security of RPSs because of the high integration level of the RESs.

DOI： 10.1007/978-3-030-33455-0_7

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記述言語：英語   掲載種別：記事・総説・解説・論説等（商業誌、新聞、ウェブメディア）

© 2020, Springer Nature Switzerland AG. This chapter presents a digital model of decentralized load frequency control (LFC) using an optimal PID controller in a real hybrid power system (e.g., Egyptian power system (EPS)) considering communication delays. The EPS includes both conventional generation sources (i.e., steam, gas, hydraulic power plants) with inherent nonlinearities and wind power, which is extracted from Zafarana wind farm, located in Egypt. Thus, the optimal digital controller-based Tustin’s technique is designed for every subsystem of the EPS separately to guarantee the stability of the overall closed-loop system. The efficiency of the proposed digital model is evaluated and compared with the analog model under variation in loading patterns, loading circumstances, system parameters, wind farm penetration, and communication delays. Results endorsed that the proposed digital model can effectively regulate the system frequency and guarantee robust performance under different conditions. It also provides a reliable performance at large sampling times, meaning a decrease in the cost of execution.

DOI： 10.1007/978-3-030-33455-0_6

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記述言語：英語   掲載種別：記事・総説・解説・論説等（商業誌、新聞、ウェブメディア）

© 2020, Springer Nature Switzerland AG. Renewable energy sources (RESs) are growing rapidly and highly penetrated in microgrids (μGs). However, there are some impacts resulting from integrating RESs such as power fluctuations caused by the intermittent nature of RESs, and lack of system inertia resulting from replacement of synchronous generators with RESs. Hence, in order to cope with this challenge and benefit from a maximum capacity of the RESs, this chapter presents a new frequency control strategy based on a virtual inertia control to emulate virtual inertia into the μG control loop, thus stabilizing μG frequency during high penetration of RESs. Moreover, the proposed virtual inertia control system based on an optimal proportional–integral (PI) controller is coordinated with digital over/underfrequency relay to improve the frequency stability and maintain the dynamic security of the μG considering high penetration of RESs. The studied system simulation results are conducted using MATLAB/Simulink® software to validate the efficacy of the proposed coordination scheme. Results endorsed that the proposed coordination scheme can efficiently regulate the μG frequency and ensure robust performance to maintain the dynamic security of μG with high penetration of RESs for various contingencies.

DOI： 10.1007/978-3-030-33455-0_4

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記述言語：英語   掲載種別：記事・総説・解説・論説等（商業誌、新聞、ウェブメディア）

© 2020, Springer Nature Switzerland AG. In this chapter, a comprehensive literature review on the issue of load frequency control (LFC) in the power system has been highlighted. The various power system model configurations and control techniques/strategies concerned with LFC problems have been discussed in both conventional and renewable power systems. In addition, the suggested LFC control strategies have been researched and classified into various control groups. Finally, the chapter highlights the study gaps and presents some new research directions in the field of LFC.

DOI： 10.1007/978-3-030-33455-0_1

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記述言語：英語   掲載種別：記事・総説・解説・論説等（商業誌、新聞、ウェブメディア）

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記述言語：英語   掲載種別：記事・総説・解説・論説等（商業誌、新聞、ウェブメディア）

© 2020, Springer Nature Switzerland AG. This chapter presents a coordination of secondary frequency control (i.e., load frequency control) and superconducting magnetic energy storage (SMES) technology using a new optimal PID controller in a real power system (e.g., Egyptian power system (EPS)) considering high wind power penetration (HWPP). This coordination scheme is proposed for compensating the system frequency deviation, preventing the conventional generators from exceeding their power ratings during load disturbances, and mitigating the power fluctuations from wind power plants. The EPS considering HWPP was tested by the MATLAB/Simulink simulation to prove the effectiveness of the proposed coordinated control strategy. The convention plants of the EPS are decomposed into three dynamics subsystems: hydro, reheat, and non-reheat power plants. Moreover, the physical constraints of the governors and turbines such as generation rate constraint (GRC) of power plants and speed governor dead-band are taken into consideration. The results show the superior robustness of the proposed coordination against all scenarios of various load profiles, and system uncertainties in the EPS considering HWPP. Furthermore, the results were verified by comparing it with both the optimal LFC with/without the effect of conventional SMES, which is without modifying the input control signal.

DOI： 10.1007/978-3-030-33455-0_2

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記述言語：英語   掲載種別：記事・総説・解説・論説等（商業誌、新聞、ウェブメディア）

© 2020, Springer Nature Switzerland AG. Today’s power systems have a high-level penetration of renewable energy sources (RESs). Therefore, the modern power systems become more susceptible to the system insecurity than conventional power systems due to lack of system inertia that results from replacing the conventional generators with RESs and frequency fluctuations that result from the intermittent nature of the RESs. Hence, this chapter presents a new strategy of frequency control including virtual inertia control based on virtual synchronous generator (VSG), which emulates the behavior of conventional synchronous generator in large power systems, thus adding some inertia to the system control loop virtually and accordingly stabilizing the system frequency during high penetration of RESs. Moreover, this chapter proposes an efficient coordination scheme of frequency control loops including the proposed virtual inertia control system-based VSG and digital over/underfrequency protection for maintaining the dynamic security of the renewable power systems because of the high integration level of the RESs. System modeling and simulation results are carried out using MATLAB/Simulink® software. Results approved that the proposed coordination scheme can effectively regulate the system frequency and guarantee robust performance to preserve the dynamic security of renewable power systems with high penetration of RESs for different contingencies.

DOI： 10.1007/978-3-030-33455-0_5

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© The Author(s) 2019. This article proposes a robust load frequency control using a new optimal proportional–integral–derivative controller–based genetic moth swarm algorithm for islanded microgrids considering high wind power penetration. In such microgrids, the replacement of conventional generator units with a large number of renewable energy sources reduces the system inertia, which in turn causes undesirable influence on microgrid frequency stability, leading to weakening of the microgrid. Furthermore, sudden load shedding, load restoring, and short circuits caused large frequency fluctuations which threaten the system security and could lead to complete blackouts as well as damages to the system equipment. In order to solve this challenge, this study proposes a new coordinated optimal load frequency control plus modified control signal to superconducting magnetic energy storage for compensating the microgrid frequency deviation (∆f). To prove the effectiveness of the proposed coordinated control strategy, an islanded microgrid was tested for the MATLAB/Simulink simulation. The physical constraints of the turbines such as generation rate constraints and speed governor dead band are considered in this study. The results confirmed the effectiveness and robustness of the proposed coordination performance against all scenarios of different load profiles, wind power fluctuation, and system uncertainties in microgrid integrated with high penetration of wind farms. Moreover, the results have been compared with both: the optimal load frequency control with/without the effect of conventional superconducting magnetic energy storage.

DOI： 10.1177/0309524X18824533

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© JES 2019. In modern power systems, the penetration level of Renewable Energy Sources (RESs) is strikingly increasing. Where, many synchronous generators are being replaced by the RESs-based the power electronic devices, this will reduce the overall system inertia. Moreover, the intermittent nature of the RESs causes several control problems such as frequency/voltage instability problem. Hence, these disturbances threaten preservation the power system stability and can lead to system collapse. In addition, the secondary frequency control action (i.e., Load Frequency Control (LFC) will not be sufficient to maintain the system frequency close to its scheduled value. Therefore, this paper proposes an application of Superconducting Magnetic Energy Storage (SMES) system based on an optimal PID controller, which is optimally designed by the Particle Swarm Optimization (PSO) to enhance the frequency stability of modern power systems due to high RESs penetration. From the perspective of the LFC, the proposed controlled SMES can be used as a feedback controller with the aim of supporting the frequency control loops for frequency stability enhancement of the power systems. Moreover, the effectiveness of the proposed control strategy is tested and verified through a real hybrid power system in Egypt (i.e., Egyptian Power System (EPS) that includes thermal, gas, hydraulic power plants, wind, and solar energy. The obtained simulation results by Matlab/Simulink software reveal that the proposed control strategy achieved superior dynamic responses satisfying the LFC requirements in all test scenarios. Consequently, the frequency stability is improved regarding peak undershoot, peak overshoot, and settling time.

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2019 by the authors. To integrate renewable energy into microgrids with a favorable inertia property, a virtual inertia control application is needed. Considering the inertia emulation capabilities, insufficient emulation of inertia power due to the lower and short-term power of storage systems could significantly cause system instability and failure. To enhance such capability, this paper applies a virtual inertia control topology to the superconducting magnetic energy storage (SMES) technology. The SMES-based virtual inertia control system is implemented in a microgrid with renewables to emulate sufficient inertia power and maintain good system frequency stability. The efficacy and control performance of the proposed control method are compared with those of the traditional virtual inertia control system. Simulation results show that the shortage of system inertia due to renewable penetration is properly compensated by the proposed control method, improving system frequency stability and maintaining the robustness of system operations.

DOI： 10.3390/en12203902

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2019 Association for Computing Machinery. In recent years, global warming is increasing due to the influence of greenhouse gas such as carbon dioxide. Therefore, in the automotive field, emission control has been conducted. Then, automakers are focusing on the EV development. This development still has some concern problems such as a short-distance driving range, long-period charging time, and small amount of charging infrastructure compared with the internal combustion engine vehicle. In addition, EV offers a special feature such as regenerative braking systems. Accordingly, our research team has used the Geographic Information System, road networks, elevation models, and EV driving data to derive the equations of estimated power consumption for each vehicle type individually. The driving support system that manages electric power of EV using this formula is constructed. This research standardized the derivation method of estimated power consumption formula based on previous research achievement. Furthermore, this research constructed a mechanism to collect driving data of the user, reviewing the estimated power consumption formula after the EV was sold. In the accuracy verification of the estimated power consumption, the estimated value calculated by the system was compared with the measured value and the WLTC value. As a result, it was confirmed that to reduce the error.

DOI： 10.1145/3362752.3362754

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2019 Elsevier Ltd The renewable power systems have become more susceptible to the system insecure than traditional power systems due to reducing of the total inertia and damping properties that result from replacing the conventional generators with Renewable Energy Sources (RESs) as well as decoupling of the RESs from the AC grid using power converters. Therefore, maintaining the dynamic security of renewable power systems is the key challenge for integrating more RESs. This paper addresses a new strategy of frequency control including virtual inertia control based on Virtual Synchronous Generator (VSG), which emulates the behavior of conventional synchronous generators in large power systems, thus adding some inertia to the system control loop virtually and accordingly stabilizing the system frequency during high penetration of RESs. Moreover, the proposed virtual inertia control system-based VSG is coordinated with digital frequency protection for improvement the frequency stability and preservation the power system dynamic security because of the high integration level of the RESs. The effectiveness of the proposed coordination scheme is tested and verified through small and large scales of power systems, Microgrid (µG) and real hybrid power system in Egypt, respectively. System modelling and simulation results are carried out using Matlab/Simulink® software. The simulation results validated that the proposed coordination scheme can effectively regulate the system frequency and ensure robust performance to maintain the dynamic system security with high share of RESs for different contingencies.

DOI： 10.1016/j.ijepes.2019.02.007

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2019 IEEE. This paper proposes current-channel-selectable multi objective optimal Phasor Measurement Unit (PMU) placement problem with measurement uncertainty propagation. In proposed Multi Objective Optimal PMU Placement (MOOPP) problem, allocation of the current phasor channel of the PMU can be selected for reducing the total PMU placement cost. However, in practice, uncertainty of measurement makes the estimation error bigger because of use of pseudo measurement by the current channel selection. This paper proposes the optimal PMU placement method considering minimizing both the total PMU placement cost and the state estimation error with uncertainty propagation. The result of the numerical experiment demonstrates the advantage of considering the measurement uncertainty propagation, compared to the conventional method which ignores it, in IEEE New England 39-bus test system. As a result, the proposed method obtained a better Pareto solution compared to the conventional methods because of consideration of measurement uncertainty in the pseudo measurements.

DOI： 10.1109/GTDAsia.2019.8715873

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2019 IEEE. According to the growing share of renewable energy and power electronic interfaces in power systems, the inertia/damping of power systems are critically decreased, which introduce the new stability issues, leading to system instability and power failures. Confronted with this problem, this research proposes an extended design of virtual inertia control based on a practical system to emulate inertia and damping properties simultaneously, improving system frequency stability and performance. The proposed control loop uses the derivative control technique, which creates a second-order characteristic, enabling higher-level application of inertia and damping into the system. The results show that the stabilizing effect of the presented technique is superior to the conventional virtual inertia control under different test scenarios including the reduction of system inertia and damping, load changes, and change in RESs penetration.

DOI： 10.1109/GTDAsia.2019.8715859

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2019 Elsevier B.V. In applying virtual synchronous generator (VSG) to solve low inertia problem due to high renewable energy sources (RESs) penetration in the power system, selecting proper value for its parameters is important to maintain frequency stability of the system subject to dynamic events and contingencies. For this purpose, several methods have been proposed. However, in those methods, VSG parameters are selected without considering system frequency protection scheme. Therefore, the setting of the existing frequency protection scheme might be inadequate for the application in low inertia condition. In this paper, a method to select proper virtual inertia constant of VSG by taking the system frequency protection scheme into account is proposed. The dynamic change of the virtual inertia constant is shown under different system inertia and penetration level of RESs. Using the proposed method, optimal virtual inertia support from VSG for different system inertia condition could be achieved in line with the existing system frequency protection scheme and thus, the reconfiguration of the existing frequency protection scheme is not necessary for the application in low inertia condition.

DOI： 10.1016/j.epsr.2019.01.025

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2019, International Journal of Electrical and Electronic Engineering & Telecommunications. The suppression of photovoltaic power generation output fluctuation has been investigated by using thermal radiative cooling/heating system. The thermal radiative cooling/heating system is novel equipment that can provide an energy-saving, comfortable and healthy living environments by utilizing heat pump technology and an active radiative heat transfer. The characteristic of this system is to maintain the thermal environment with respect to power fluctuations. Photovoltaic power generation has a characteristic that the amount of power generation varies according to the weather. When a large amount of photo-voltaic power generation is installed, the short-term supply and demand imbalance occurs, which causes the frequency deviation. Then, a method to suppress such power fluctuation by thermal radiative cooling/heating system is proposed. As a result of the numerical experiment, the proposed method shows efficient suppression performance.

DOI： 10.18178/ijeetc.8.3.146-151

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2019 IEEE. Indonesia state electric company (PLN) through the Electricity Business plan (RUPTL) 2018-2027 is targeted to realize 23% of energy mix on the renewable energy system. Photovoltaic (PV) is one of the alternative solutions considered due to its environmentally friendly energy and the trend of its price decline. However, PV penetration on the grid may affect the grid frequency stability due to their intermittency. Hence, in this paper, the cost-benefit analysis was conducted to calculate the amount of the PV penetration, and then, its impact on frequency stability is analyzed. The South-Central Kalimantan system is used as the study case. The simulations show that PV penetration reduced the NPC (Net Present Cost) and LCOE (Levelized Cost of Energy) of the system. Also, the system frequency deviation was affected by the size of the system load and PV capacity. To maintain the frequency according to the grid code of 49.5 Hz, the use of the battery is required in several scenarios.

DOI： 10.1109/ISGT-Asia.2019.8880875

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2019 Wiley Periodicals, Inc. The optimal phasor measurement unit (PMU) placement problem in power systems has been considered and investigated by many researchers for accurate and fast state estimation by PMUs. However, the current channel cost of the PMU affects the total placement cost. This paper proposes a novel formulation in the multi-objective optimal PMU placement, which minimizes the PMU placement cost with the current channel selection and the state estimation error. The current channel selection is represented as a decision variable in the optimization. For trade-off objective functions, the Pareto approach by nondominated sorting genetic algorithm II (NSGA-II) is applied in the optimization. The result of the numerical experiment in this paper demonstrates the advantage of considering the appropriate PMU current channel allocation, compared with the conventional method that ignores it, in the modified IEEE New England 39-bus test system. As a result, the proposed method obtained a better Pareto solution compared with the conventional one because of the consideration for the current channel selection. An advantage of the proposed PMU placement is that it is able to reduce the total PMU placement cost while maintaining the state estimation accuracy.

DOI： 10.1002/eej.23208

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© School of Engineering, Taylor’s University. This paper proposes a decentralized design of Load Frequency Control (LFC) for a real hybrid power system in Egypt with the integration of Renewable energy Sources (RESs). The Egyptian Power System (EPS) is decomposed into three dynamic subsystems; non-reheat, reheat and hydraulic power plants. Moreover, the physical constraints of the speed governors and turbines (i.e., Governor Deadband (GDB) and Generation Rate Constraints (GRCs)) are taken into consideration. Whereas, each subsystem has its own characteristics compared to the others. Therefore, each subsystem controller has been designed independently to guarantee the stability of the overall closed-loop system. Hence, an optimal PID controller-based Particle Swarm Optimization (PSO) is proposed for every subsystem separately to regulate the frequency and to track the load demands of the EPS. The performance of the proposed decentralized PID controller of each subsystem is compared with the centralized one under variation in loading patterns, system parameters, and RESs penetration level. System modelling and simulation results are carried out using Matlab/Simulink® software. The simulation results reveal the proposed decentralized model gives superior dynamic responses satisfying the LFC requirements in all test scenarios. Consequently, the frequency stability is improved regarding peak undershoot, peak overshoot, and settling time.

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© The Institution of Engineering and Technology 2018. With rapid growth of renewable energy sources (RESs) in modern power systems, the microgrids (μGs) have become more susceptible to the disturbances (e.g. large frequency/voltage fluctuations) than the conventional power systems due to decreasing their inertia constant. This low system inertia issue could affect the μGs stability and resiliency in the situation of uncertainties, thus threaten their dynamic security. Hence, preserving μG dynamic security is one of the important challenges, which is addressed in this study. Therefore, this study proposes a novel concept of frequency control incorporating a virtual inertia control-based optimal proportional-integral controller to emulate virtual inertia into the μG control loop, thus stabilising μG frequency during high penetration of RESs. Moreover, the proposed virtual inertia control system is coordinated with digital over/under frequency protection for enhancement of the frequency stability and preservation of the μG dynamic security because of the high integration level of the RESs. The simulation results of the studied μG are carried out using MATLAB/Simulink® software to validate the effectiveness of the proposed coordination scheme. Results approved that the proposed coordination scheme can effectively regulate the μG frequency and guarantee robust performance to preserve the dynamic security of μG with high penetration of RESs for different contingencies.

DOI： 10.1049/iet-rpg.2018.5513

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2018 IEEE. Due to widespread utilization of renewable energy sources (RESs), communities with high RESs penetration are facing a new stability issue as the power converters-based RESs create the significant lack of inertia power, causing system instability and power blackouts. To overcome the problem, this paper presents a novel application of virtual inertia emulation using energy storage systems (ESS) to emulate inertia power, improving frequency performance and stability. The derivative control method has been applied for advanced-level control of inertia emulation. Therefore, the proposed technique has a second order characteristic, which generates virtual inertia power into the community-based high RESs penetration, improving dynamic frequency stability and avoiding power blackouts. The effects of virtual inertia control gain against the system stability-based high RESs penetration are also investigated. The efficiency of the proposed technique over stability enhancement has been evaluated through a microgrid test system considering high penetration level of RESs in different scenarios. This work also demonstrates a detailed needs-Assessment of community-based high RESs which can influence the potential sustainable energy solution.

DOI： 10.1109/GHTC.2018.8601755

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2019 IEEE. Renewable energy sources (RESs) are growing rapidly and highly penetrated in microgrids (MGs). As a result of the replacement of the synchronous generators with a large amount of RESs, the overall system inertia might be dramatically reduced which negatively affected the MG dynamics and performance in face of uncertainties, leading to weakening of the MG stability, which considers being a serious challenge in such grids. Therefore, in order to cope with this challenge and benefit from a maximum capacity of the RESs, robust control strategy must be applied. Hence, in this paper, a new application of robust virtual inertia control-based coefficient diagram method (CDM) controller is proposed in an islanded MG considering high-level RESs penetration for enhancement the system's validity and robustness in face of disturbances and parametric uncertainties. The proposed controller's proficiency has been checked and compared with H-infinite controller using MATLAB/Simulink which approved that the CDM controller achieved superior dynamic responses in terms of accurate reference frequency tracking and disturbance reduction over H-infinite in all test scenarios. Thus, the proposed controller alleviates the difficulties of H-infinite controller such as the experience and necessary abilities to design the form of the weighting functions for the system. Consequently, the frequency stability is improved and approved that the proposed CDM-based virtual inertia controller can significantly support a low-inertia islanded microgrid against RESs and load fluctuations.

DOI： 10.1109/ACCESS.2019.2894840

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2019 Walter de Gruyter GmbH, Berlin/Boston 2019. This paper presents an assortment study between the virtual inertia control (VIC)-based a new optimal PID controller, load frequency control (LFC), and the digital protection for an islanded microgrid (MG) taking into consideration the emerging level of renewable energy resources (RERs), which is a promising solution. However, the reduction in system inertia due to increasing the amount of RERs causes undesirable impact to MG dynamic stability, threatens the system security, and could lead to complete blackouts as well as damages to the system equipment. Therefore, maintaining the dynamic security in MGs is one of the important challenges, which considered in this paper using a specific design of a digital over/under frequency relay (OUFR) with coordination of the VIC to protect the MG against high-frequency variations. To prove the effectiveness of the proposed coordination strategy, it has been tested considering sudden load change, high integration of RERs. Moreover, the sensitivity analysis of the presented technique was examined by varying the inertia level of MG system. The results stated that the proposed coordination can effectively regulate the MG frequency and maintain the dynamic stability and security.

DOI： 10.1515/ijeeps-2018-0136

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2019 IEEE. Virtual inertia control is considered as an important part of microgrids with high renewable penetration. Virtual inertia emulation based on the derivative of frequency is one of the effective methods for improving system inertia and maintaining frequency stability. However, in this method, the ability to provide virtual damping is usually neglected in its design, and hence, its performance might be insufficient in the system with low damping. Confronted with this issue, this paper proposes a novel design and analysis of virtual inertia control to imitate damping and inertia properties simultaneously to the microgrid, enhancing frequency performance and stability. The proposed virtual inertia control uses the derivative technique to calculate the derivative of frequency for virtual inertia emulation. Trajectory sensitivities have been performed to analyze the dynamic impacts of the virtual inertia and virtual damping variables over the system performance. Time-domain simulations are also presented to evaluate the efficiency of the virtual damping and virtual inertia in enhancing system frequency stability. Finally, the efficiency and robustness of the proposed control technique are compared with the conventional inertia control under a wide range of system operation, including the decrease in system damping and inertia and high integrations of load variation and renewable energy.

DOI： 10.1109/ACCESS.2019.2892747

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2019 The Institute of Electrical Engineers of Japan. The optimal Phasor Measurement Unit (PMU) placement problem in power systems has been considered and investigated by many researchers for accurate and fast state estimation by PMU. There is a problem that the current channel cost of the PMU affects the total placement cost. This paper proposes novel formulation in multi objective optimal PMU placement which minimizes the PMU placement cost with the current channel selection and the state estimation error. The current channel selection is represented as a decision variable in the optimization. For those trade-off objective functions, the Pareto approach by Non-dominated Sorting Genetic Algorithm II (NSGA-II) is applied in the optimization. The result of the numerical experiment in this paper demonstrates the advantage of considering the appropriate PMU current channel allocation, compared to the conventional method which ignores it, in the modified IEEE New England 39-bus test system. As a result, the proposed method obtained a better Pareto solution compared to the conventional one because of consideration for the current channel selection. The proposed PMU placement shows its advantage that it is able to reduce the total PMU placement cost while it keeps the state estimation accuracy.

DOI： 10.1541/ieejpes.139.84

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018, Engineering and Technology Publishing. All rights reserved. The use of photovoltaic (PV) systems is rapidly increasing worldwide as a source of renewable power generation. During operation, their power output is influenced by weather conditions. If the surface of the PV cell does not receive adequate sunlight due to shade or precipitation, less electricity will be generated. An optimal location for a PV system that receives enough solar radiation must therefore be determined by considering the influence of partial shadows. In this work, solar radiation data is analyzed using a geographic information system (GIS) and digital surface model (DSM). However, the resolution of the DSM provided by Kitakyushu City was not high enough to describe the necessary details of partial shadows. To overcome this problem, a method using a high-resolution DSM based on aerial photographs taken by a drone is proposed. The proposed high-resolution DSM was able to accurately reproduce the shape of the partial shadow and evaluate the detailed locations and shapes of partial shadows. Evaluating the solar radiation considering weather conditions by the data values obtained from a pyranometer indicated that a pyranometer could be used to correct the result of solar radiation analysis considering weather conditions.

DOI： 10.12720/sgce.8.1.48-53

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2019 Ain Shams University This paper presents a digital model of decentralized Load Frequency Control (LFC) using an optimal PID controller-based Particle Swarm Optimization (PSO) in Egyptian Power System (EPS) considering communication delays. The EPS includes both conventional generation units (i.e., non-reheat, reheat, and hydraulic power plants) with inherent non-linearities and wind power, which extracted from Zafarana wind farm, location in Egypt. Thus, the optimal digital controller-based Tustin's technique is designed for every subsystem of the EPS separately to guarantee the stability of the overall closed-loop system. The performance of the proposed digital model is tested and compared with the analog model under variation in loading patterns, loading conditions, system parameters, wind farm penetration, and communication delays. Results approved that, the proposed digital model can effectively regulate the system frequency and guarantee robust performance under different conditions. Also, it gives a reliable performance at large sampling times, which means a reduction of implementation cost.

DOI： 10.1016/j.asej.2019.01.004

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2013 IEEE. Maintaining frequency stability of low inertia microgrids with high penetration of renewable energy sources (RESs) is a critical challenge. Solving this challenge, the inertia of microgrids would be enhanced by virtual inertia control-based energy storage systems. However, in such systems, the virtual inertia constant is fixed and selection of its value will significantly affect frequency stability of microgrids under different penetration levels of RESs. Higher frequency oscillations may occur due to the fixed virtual inertia constant or unsuitable selection of its value. To overcome such a problem and provide adaptive inertia control, this paper proposes a self-adaptive virtual inertia control system using fuzzy logic for ensuring stable frequency stabilization, which is required for successful microgrid operation in the presence of high RESs penetration. In this concept, the virtual inertia constant is automatically adjusted based on input signals of real power injection of RESs and system frequency deviations, avoiding unsuitable selection and delivering rapid inertia response. To verify the efficiency of the proposed control method, the contrastive simulation results are compared with the conventional method for serious load disturbances and various rates of RESs penetration. The proposed control method shows remarkable performance in transient response improvement and fast damping of oscillations, preserving robustness of operation.

DOI： 10.1109/ACCESS.2019.2920886

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2019 The Authors. Published by Elsevier Ltd. This paper presents an effective solution for maintaining the frequency stability of the islanded microgrid (MG). This solution is based on the coordination of the load frequency control (LFC) using optimal proportional–integral–derivative (PID) controller-based new swarm algorithm and the superconducting magnetic energy storage (SMES) for compensating the MG frequency deviation. Due to SMES integration, the voltage and frequency will change, and the operation of the frequency relays may be affected. Therefore, the impact of the proposed coordination on the operation of the digital frequency relay (DFR) is presented. This relay will cover both over and under frequency conditions to protect the MG against high frequency variations. The proposed coordination and response of the DFR are validated using a small islanded MG in the MATLAB/SIMULINK considering high integration of renewable energy sources (RESs) and system uncertainties. The results proved the effectiveness of the proposed coordination to maintain the dynamic stability and security of the MG. In addition, the superiority of the DFR has been approved with and without using SMES.

DOI： 10.1016/j.egypro.2018.11.295

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2013 IEEE. Virtual inertia emulation could be regarded as an inevitable component of microgrids with renewable energy, enhancing microgrid inertia and damping properties. In applying this control technique, a phase-locked loop (PLL) is necessary to obtain the estimation of the system frequency data. However, the employment of PLL could cause larger frequency oscillation to the microgrid due to its dynamics. This issue would be exacerbated in a low-inertia microgrid driven by high renewable penetration, severely deteriorating the frequency stability. Thus, the effect of PLL with measurement delay is a critical issue in utilizing the virtual inertia control. To overcome such problem, this paper proposes a robust virtual inertia control for a low-inertia microgrid to minimize the undesirable frequency measurement effects, improving the microgrid frequency stability. The robust H∞ control design using a linear fractional transformation (LFT) technique is used to develop the virtual inertia control loop, considering the dynamics of PLL with measurement delay and the uncertainties of system inertia and damping. The efficacy of the proposed H∞ control method is compared to the conventional and optimum proportional-integral (PI)-based inertia control. The results show that the H∞ -based robust virtual inertia control is superior to both conventional virtual inertia control and optimum PI-based virtual inertia control against a wide range of microgrid operating conditions, disturbances, and parametric uncertainties.

DOI： 10.1109/ACCESS.2019.2913042

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018, The Author(s). With rapidly growing of Renewable Energy Sources (RESs) in renewable power systems, several disturbances influence on the power systems such as; lack of system inertia that results from replacing the synchronous generators with RESs and frequency/voltage fluctuations that resulting from the intermittent nature of the RESs. Hence, the modern power systems become more susceptible to the system instability than conventional power systems. Therefore, in this study, a new application of Superconducting Magnetic Energy Storage (SMES) (i.e., auxiliary Load Frequency Control (LFC)) has been integrated with the secondary frequency control (i.e., LFC) for frequency stability enhancement of the Egyptian Power System (EPS) due to high RESs penetration. Where, the coordinated control strategy is based on the PI controller that is optimally designed by the Particle Swarm Optimization (PSO) algorithm to minimize the frequency deviations of the EPS. The EPS includes both conventional generation units (i.e., non-reheat, reheat and hydraulic power plants) with inherent nonlinearities, and RESs (i.e., wind and solar energy). System modelling and simulation results are carried out using Matlab/Simulink® software. The simulation results reveal the robustness of the proposed coordinated control strategy to preserve the system stability of the EPS with high penetration of RESs for different contingencies.

DOI： 10.1186/s41601-018-0112-2

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018, The Author(s). This paper presents a coordination strategy of Load Frequency Control (LFC) and digital frequency protection for an islanded microgrid (MG) considering high penetration of Renewable Energy Sources (RESs). In such MGs, the reduction in system inertia due to integration of large amount of RESs causes undesirable influence on MG frequency stability, leading to weakening of the MG. Furthermore, sudden load events, and short circuits caused large frequency fluctuations, which threaten the system security and could lead to complete blackouts as well as damages to the system equipment. Therefore, maintaining the dynamic security in MGs is one of the important challenges, which considered in this paper using a specific design and various data conversion stages of a digital over/under frequency relay (OUFR). The proposed relay will cover both under and over frequency conditions in coordination with LFC operation to protect the MG against high frequency variations. To prove the response of the proposed coordination strategy, a small MG was investigated for the simulation. The proposed coordination method has been tested considering load change, high integration of RESs. Moreover, the sensitivity analysis of the presented technique was examined by varying the penetration level of RESs and reducing the system inertia. The results reveal the effectiveness of the proposed coordination to maintain the power system frequency stability and security. In addition, the superiority of the OUFR has been approved in terms of accuracy and speed response during high disturbances.

DOI： 10.1186/s41601-018-0093-1

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018, Engineering and Technology Publishing. All rights reserved. Nowadays, the interconnection issues of different power plants are interested and must be highlighted, such as the frequency stability and voltage stability, which are a basic principle in the power system operation. Many reasons such as, load shedding, load restoring, and short circuits cause large frequency fluctuations, which threaten the system security and could lead to complete blackouts as well as damages to the system equipment. Hence, this paper proposes a coordination of Load Frequency Control (LFC), which uses an optimized PID controller-based new Moth Swarm algorithm (MSA) and digital under/over frequency relay for a realistic multi-source power system considering different cases study of load shedding and restoring. The digital relay will be energized by the data conversion system under normal and fault conditions. The presented digital frequency relay will cover both over and under frequency conditions. To validate the effect of the proposed coordination, the Egyptian Power System (EPS), which contains three dynamics subsystems, hydro, reheat, and non-reheat power plants, was investigated for the MATLAB/SIMULINK considering the effect of system nonlinearity. The obtained results stated the effectiveness of the proposed coordination to maintain the power system frequency stability and security. Furthermore, the superiority of the under/over digital frequency relay has been approved.

DOI： 10.12720/sgce.7.4.240-251

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2018 IEEE. One of the solutions to solve the low inertia issue in the power system due to the integration of renewable energy sources (RESs) is by using a virtual synchronous generator (VSG). However, most of the VSG research is conducted focused on the area of power electronics using a simple generator-load system. In this paper, the results of an investigation on the placement of virtual synchronous generator (VSG) in a two-area, four-generator power system are presented. The effects of the placement of VSG at different locations in the system with reduced inertia are analyzed using time-domain and modal analysis.

DOI： 10.1109/ISGT-Asia.2018.8467826

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018, The Institution of Engineering and Technology. This study presents a digital coordination strategy of load frequency control (LFC) and Over/Under Frequency Relay (OUFR) protection for an isolated microgrid (MG) considering high penetration of renewable energy sources (RESs). In such MGs, the reduction in system inertia due to the replacement of traditional generating units with a large amount of RESs causes undesirable influence to MG frequency stability, leading to weakening of the MG. Furthermore, sudden load change and short circuits caused large frequency fluctuations which threaten the system security. In order to handle these challenges, this study proposes a specific design of the digital OUFR, which will operate for both conditions of over and under frequency in coordination with digital PID controller based on mapping technique in discretization process to protect the MG against highfrequency variations. To prove the effectiveness of the proposed digital coordination strategy, a small MG was investigated for the simulation considering load change, varying the penetration level of RESs and the system inertia. The results reveal the robustness of the proposed coordination to maintain the MG frequency stability and security. In addition, the superiority of the digital OUFR has been approved in terms of accuracy and speed response during high disturbances.

DOI： 10.1049/iet-gtd.2018.0264

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2018 IEEE. Nowadays, several microgrid (MG) integration issues are interested and must be highlighted. Due to wind power is highly dependent on wind speed, which is naturally variable, severe stability problems can be caused in power systems, especially when the wind power has a high penetration level. To improve the stability of the MG, the control actions need to be more robust and efficient. Hence, this paper proposes the use of an energy storage system (ESS) based on Superconducting Magnetic Energy Storage (SMES), which uses the Fuzzy Logic Control (FLC) with power electronic technology to control the power transfer from/to the MG. Furthermore, the reactive power of the SMES is controlled using voltage source converter (VSC) to mitigate the voltage fluctuations. This control strategy has been tested out using different scenarios of wind speed gust, load shedding and loads restoring, which highly influence the power system operation. To prove the efficient performance of the proposed control strategy, an isolated MG comprises of squirrel cage induction generators (SCIG) as a wind turbine generator (WTG) and diesel synchronous generators; was investigated for the simulation using MATLAB/Simulink. Moreover, the proposed technique is compared with the conventional energy storage device like DC batteries. The obtained simulation results stated that the SMES based-FLC achieved superior dynamic responses satisfying the stability requirements in all test scenarios.

DOI： 10.1109/EPECS.2018.8443537

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2018 IEEE. This paper presents a Load Frequency Control (LFC) design using a new optimal PID controller-based Moth Swarm Algorithm (MSA) in Egyptian power system (EPS) in the presence of wind farms. To improve the frequency stability of the EPS, the control action needs to be more robust and efficient. Hence, this study presents a coordination between the secondary control (i.e., LFC), and controlled Superconducting Magnetic Energy Storage (SMES) using the optimal PID controller-based MSA for frequency stability enhancement of the EPS. Moreover, the performance of the proposed coordination is compared with both; the optimal LFC with/without the uncontrollable SMES under different load profiles, wind power fluctuations, and system uncertainty. To prove the effectiveness of the proposed coordination, the EPS with inherent nonlinearity was tested using Matlab/SIMULINK® software. The results confirmed that the robustness of the proposed coordination in terms of reducing transient time, minimizing the frequency deviations, and preventing conventional generators from exceeding their power ratings during load disturbances.

DOI： 10.1109/EPECS.2018.8443496

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2018 IEEE. This paper presents a study on the transient air-gap torque of induction motors by the bus transfer. The phase difference between the source and the residual voltage of induction motors could cause a large torque on the motors. The peak air-gap torque is investigated based on the resultant vectorial Volts per Hertz between the source and the motor bus. The interaction between multiple motors, the influence of the inertia and loading condition have been analyzed by simulations.

DOI： 10.1109/EPECS.2018.8443500

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2018 IEEE. The main purpose of this paper is to propose an approach of the PSS (Power System Stabilizer) parameter tuning for interconnection system between Kalimantan Selatan - Tengah (Kalselteng) and Kalimantan Timur (Kaltim) in Indonesia. At this time, PSS module that exists on the generators in both of the subsystems have not been activated yet. This paper is expected to be a reference to determine the location and to tune the PSS parameter values for the other electrical power system in Indonesia. The location of PSS is determined by participation factor using DIgSILENT PowerFactory ® software, then the tuning is processed using Particle Swarm Optimization (PSO) method by MATLAB ®. After getting the tuned PSS parameter values, the response of the system towards the short-circuit simulation is compared with typical values of PSS parameter [7] as the validation process.

DOI： 10.1109/EPECS.2018.8443361

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2018 IEEE. In applying virtual synchronous generator (VSG) to solve the low system inertia issue in the microgrid, especially in a microgrid without secondary control loop, one aspect that should be considered is the allocation of the VSG active power output. It should be properly determined to maintain the frequency of microgrid within the allowable margin, including during a large system disturbance. This paper presents an approach to obtain a proper active power reference of VSG using particle swarm optimization (PSO) by also considering several operating scenarios. By using the obtained active power reference, the microgrid frequency could be restored within allowable limits in various scenarios with minimum average final frequency deviation after an occurrence of a large disturbance, thus prevent the unnecessary load shedding and improving overall system frequency stability.

DOI： 10.1109/EPECS.2018.8443565

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© The Institution of Engineering and Technology 2018. This study proposes a coordination of load frequency control (LFC) and superconducting magnetic energy storage (SMES) technology (i.e. auxiliary LFC) using a new optimal PID controller-based moth swarm algorithm (MSA) in Egyptian Power System (EPS) considering high wind power penetration (HWPP) (as a future planning of the EPS). This strategy is proposed for compensating the EPS frequency deviation, preventing the conventional generators from exceeding their power ratings during load disturbances, and mitigating the power fluctuations from wind power plants. To prove the effectiveness of the proposed coordinated control strategy, the EPS considering HWPP was tested by the MATLAB/SIMULINK simulation. The convention generation system of the EPS is decomposed into three dynamics subsystems; hydro, reheat and non-reheat power plants. Moreover, the physical constraints of the governors and turbines such as generation rate constraints of power plants and speed governor dead band (i.e. backlash) are taking into consideration. The results reveal the superior robustness of the proposed coordination against all scenarios of different load profiles, and system uncertainties in the EPS considering HWPP. Moreover, the results have been confirmed by comparing it with both; the optimal LFC with/without the effect of conventional SMES, which without modifying the input control signal.

DOI： 10.1049/iet-rpg.2018.5096

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2018 IEEE. Ahstract- The frequency stability is a basic principle in the power system operation. Various reasons such as, load shedding, load restoring, and short circuits cause large frequency fluctuations which threaten the system security and could lead to complete blackouts as well as damages to the system equipment. Hence, this paper proposes a coordination of Load Frequency Control (LFC), which uses an optimized PID controller-based Moth Swarm algorithm (MSA) and digital under/over frequency relay for a realistic multi-source power system protection considering different cases study of load shedding and restoring. The discrete-time data of system frequency which obtained from data conversion system is applied for energizing the digital frequency relay under the normal and faulted conditions. The presented digital frequency relay will include both over and under frequency functions. To prove the efficient effect of the proposed coordination, the Egyptian Power System (EPS), which contains three dynamics subsystems, hydro, reheat, and non-reheat power plants was investigated for the MATLAB/SIMULINK simulation considering the effect of system nonlinearity. The obtained simulation results stated the effectiveness of the proposed coordination to maintain the power system frequency stability and security. Furthermore, the superiority of the under/over digital frequency relay in terms of accuracy and speed has been approved.

DOI： 10.1109/ICEES.2018.8443194

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2018 IEEE. The frequency stability is a basic principle in the micro-grid (MG) system operation. Various reasons such as, the reduction in system inertia due to the replacement of traditional generating units with a large amount of renewable energy sources (RESs) cause undesirable influence to MG frequency stability, leading to weakening of the MG. Furthermore, sudden load shedding, load restoring, and short circuits cause large frequency fluctuations which threaten the system security and could lead to complete blackouts as well as damages to the system equipment. Hence, this paper proposes a coordination of Load Frequency Control (LFC) and digital under/over frequency relay for a small MG protection considering different cases study of load change and high integration of photovoltaic (PV) and wind farm. The discrete-time data of system frequency which obtained from data conversion system is applied for energizing the digital frequency relay under the normal and faulted conditions. The proposed digital frequency relay will include both over and under frequency functions. To prove the efficient effect of the proposed coordination, the MG was investigated for the MATLAB/ Simulation. The obtained simulation results stated the effectiveness of the proposed coordination to maintain the power system frequency stability and security. Furthermore, the superiority of the under/over digital frequency relay in terms of accuracy and speed has been approved.

DOI： 10.1109/SGCF.2018.8408943

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 Author(s). This paper addresses an intelligent control scheme using the artificial neural network (ANN) technique for modeling and simulating a central tower receiver (CTR) plant with thermal energy storage (TES). The multilayer perceptron neural network (MLPNN) was implemented with two input parameters, one output parameter, and one hidden layer. The inputs comprise the receiver inlet temperature and the receiver thermal power. The output includes the mass flow rate of heat transfer fluid. A total of 888 datasets and three types of training algorithms, Levenberg-Marquardt (LM), Quasi-Newton, and Scaled Conjugate Gradient, are applied for training the proposed MLPNN model. Among all the investigated learning algorithms, the adopted LM with 40 neurons in the first hidden layer displayed superior ability to efficiently estimate the required performance compared to other learning algorithms. Based on the statistical evaluations, the optimized LM delivered preferred values for the root mean square error (0.0037), the coefficient of variance (0.0011), and the coefficient of determination (0.9999) during the training process. Hence, the MLPNN with LM-40 is an effective technique to precisely control the mass flow rate and subsequently the receiver outlet temperature regardless of the variations in the direct solar radiation and receiver inlet temperature. Furthermore, the generation strategy was modified to regulate CTR/TES output through electricity generation according to the hot storage system conditions. The performance of the adopted CTR-ANN model is presented and compared with the System Advisor Model (SAM) results. The results demonstrate better compatibility between the adopted CTR-ANN model and SAM outputs. The simplicity and minimum required input data of our proposed model make it appropriate for evaluating the power system reliability by using the Monte Carlo method.

DOI： 10.1063/1.5029898

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2018 Author(s). Utilizing Renewable Energy Sources (RESs) is attracting great attention as a solution to future energy shortages. However, the irregular nature of RESs and random load deviations cause a large frequency and voltage fluctuations. Therefore, in order to benefit from a maximum capacity of the RESs, a robust mitigation strategy of power fluctuations from RESs must be applied. Hence, this paper proposes a design of Load Frequency Control (LFC) coordinated with Superconducting Magnetic Energy Storage (SMES) technology (i.e., an auxiliary LFC), using an optimal PID controller-based Particle Swarm Optimization (PSO) in the Egyptian Power System (EPS) considering high penetration of Photovoltaics (PV) power generation. Thus, from the perspective of LFC, the robust control strategy is proposed to maintain the nominal system frequency and mitigating the power fluctuations from RESs against all disturbances sources for the EPS with the multi-source environment. The EPS is decomposed into three dynamics subsystems, which are non-reheat, reheat and hydro power plants taking into consideration the system nonlinearity. The results by nonlinear simulation Matlab/Simulink for the EPS combined with SMES system considering PV solar power approves that, the proposed control strategy achieves a robust stability by reducing transient time, minimizing the frequency deviations, maintaining the system frequency, preventing conventional generators from exceeding their power ratings during load disturbances, and mitigating the power fluctuations from the RESs.

DOI： 10.1063/1.5039172

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2018 Author(s). Photovoltaic (PV) system integration in the electric grid has been increasing over the past decades. However, the impact of PV penetration on the electric grid, especially during the periods of higher and lower generation for the solar system at the middle of the day and during cloudy weather or at night respectively, limit the high penetration of solar PV system. In this research, a Concentrated Solar Power (CSP) with Thermal Energy Storage (TES) has been aggregated with PV system in order to accommodate the required electrical power during the higher and lower solar energy at all timescales. This paper analyzes the impacts of CSP on the grid-connected PV considering high penetration of PV system, particularly when no energy storages in the form of batteries are used. Two cases have been studied, the first when only PV system is integrated into the electric grid and the second when two types of solar energy (PV and CSP) are integrated. The System Advisor Model (SAM) software is used to simulate the output power of renewable energy. Simulation results show that the performance of CSP has a great impact on the penetration level of PV system and on the flexibility of the electric grid. The overall grid flexibility increases due to the ability of CSP to store and dispatch the generated power. In addition, CSP/TES itself has inherent flexibility. Therefore, CSP reduces the minimum generation constraint of the conventional generators that allows more penetration of the PV system.

DOI： 10.1063/1.5039224

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 by the authors. In this study, the active and reactive power control of a battery energy storage system (BESS) using fuzzy logic control to maintain the voltage and frequency stability of the islanded Mae Sariang microgrid is presented. The main scope of the presented study is to cogitate the effectiveness of the BESS controller in view of fluctuations of frequency/voltage subjected to a disturbance occurring in the islanded microgrid. In the Mae Sariang microgrid system, the electricity is produced from two renewable energy resources (RESs), i.e., hydro and solar PV. The use of these clean energy sources has become a main problem, envisaging the output power uncertainties from RESs. Further, such power uncertainty raises power quality problems and leads to power failure. To overcome such problems, the proposed fuzzy logic control (FLC) approach is applied for the BESS controller to improve the stability of the islanded Mae Sariang microgrid. The proposed FLC is intended to provide the BESS with well-established attributes of dynamical response to disturbance, which is analyzed by a predictive model. The proposed FLC has been investigated and compared with the robust control method, which is analyzed by a mathematical model using the system identification technique. The modeling of the microgrid system with BESS is implemented and verified on the DIgSILENT PowerFactory software. The simulation result illustrates that both of the control approaches allow the dynamic stability of the microgrid and the maintenance of frequency and voltage within acceptable ranges. However, the proposed BESS fuzzy logic control is less prone to uncertainty than the BESS robust control. Furthermore, in the proposed BESS fuzzy logic control, the microgrid frequency and voltage rapidly return to their normal steady-state condition and the size of the BESS is smaller than the BESS robust control.

DOI： 10.3390/su10051645

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 by the authors. Due to a rapid increase in the utilization of power converter-based renewable energy sources (RESs), the overall system inertia in an interconnected power system might be significantly reduced, increasing the vulnerability of the interconnected power system to the system instability. To overcome problems caused by the significant reduction in system inertia, this paper proposes a new application of virtual inertia control to improve frequency stability of the interconnected power system due to high penetration level of RESs. The derivative control technique is introduced for higher-level applications of virtual inertia emulation. Thus, the proposed virtual inertia control loop has a second-order characteristic, which provides a simultaneous enabling of damping and inertia emulations into the interconnected power system, enhancing frequency stability and resiliency. System modeling and simulation results are carried out using MATLAB/Simulink® (R2016b, MathWorks, Natick, MA, USA). Trajectory sensitivities are also performed to analyze the dynamic effects of virtual inertia control's parameters on the system stability. The effectiveness of the virtual inertia control concept on stability improvement is verified through a multi-area test system with high RESs penetration level for different contingencies.

DOI： 10.3390/en11040981

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2018 IEEE. This paper presents a discrete-time model of an optimal controller based on Particle Swarm Optimization (PSO) algorithm for Egyptian Power System-Load Frequency Control (EPS-LFC) with inherent nonlinearities. The realistic power system in Egypt is modeled as three dynamics subsystems which are non-reheat, reheat, and hydro power plants. Moreover, the effects of the physical constraints such as Generation Rate Constraints (GRC) and speed governor dead band are taking into consideration. Subsequently, an optimal controller is discretized to obtain optimal digital controller via bilinear transform method of mapping discretization technique for regulating the system frequency. The performance of the presented discrete-time model of EPS-LFC is compared with an analog model for different cases of disturbance and system parametric uncertainties. The results by nonlinear simulation Matlab/Simulink for the EPS-LFC approves that the digital model ensures frequency regulation performance and almost have the same performance as the analog one for different uses sampling intervals. However, the digital model produces a little larger amount of overshoot than analog model in case of large sampling time which satisfy the cost of hardware requirement.

DOI： 10.1109/ITCE.2018.8316636

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2017 IEEE. The world is turning towards smart grids. However, upgrading the existing systems could be the easiest solution for such approach. On the other hand, Load Frequency Control (LFC) is a critical issue in the dynamical operation of power systems. This paper presents LFC scheme for a realistic Power System operational in Egypt(EPS) with inherent nonlinearities. Moreover, the speed response of every subsystem is different from each other. The effects of the physical constraints such as Generation Rate Constraints (GRC) of power plants and speed governor dead band (blackash) are taken into consideration. In this paper, each subsystem controller has been designed independently to guarantee the stability of the overall closed loop system. Hence, optimal PID controllers based on Particle Swarm Optimization (PSO) algorithm are proposed for every subsystem separately to regulate the frequency and track the load. In order to investigate the ability of upgrading the system to smart grids, the performance of the proposed decentralized PID controller of each subsystems is compared with aggregate one. The proposed model can achieve a robust stability against changing the system parameters and operating load condition for the EPS with multi-source environment. The results by nonlinear simulation Matlab/Simulink for the EPS LFC approves that the decentralized model of the controller gives the same performance as the aggregated one. However, in case of large disturbances, the aggregated controller design cannot handle the fault while the decentralized scheme is more robust and effective against all disturbances and operating conditions. In contrast, in the advanced smart grids, the aggregated design would give a better flexible control strategy for the system.

DOI： 10.1109/ACCS-PEIT.2017.8303049

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2017 IEEE. In this paper, a developed model design to simulate a Concentrated Solar Power (CSP) output has been presented. Namely, Central Tower Receiver (CTR) has been designed with a control methodology based on Artificial Neural Network (ANN) technique. In this developed modeling technique, a model of an ANN technique based on MLP networks is used to evaluate the mass flow rate of the Heat Transfer Fluid (HTF) at any given value of the received solar thermal power at the tower receiver (Pth, tr) to adjust the receiver output temperature at the estimated value. The advantage of this model is the simplification and minimization of the required input data for modeling. On the other hand, the simulation result shows that the methodology in this research evaluates the performance of CTR model in a simple and fixable manner.

DOI： 10.1109/MEPCON.2017.8301357

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2017 IEEE. In this paper, a developed technique of Model Predictive Control (MPC) is proposed to decrease the execution time of the control algorithm for Modular Multilevel Converter (MMC) based on grouping the switching states. There are two stages in the control strategy to get the optimal switching state for the converter in the next sampling interval. Within the first stage, the allowable switching states of MMC are divided equally into (M) groups based on the number of sub-modules (SMs) per arm of a single-phase line. Therefore, the output of second-stage obtains the optimal state from each group of the switching states. In addition, all M groups are running simultaneously to reduce the execution time. Unlike the previous algorithm, the second stage of the proposed algorithm uses directly the optimal state and the corresponding cost function for each group from the first stage, then the optimal switching state is selected according to the minimum cost function from the M groups. Therefore, a reduction in the computational time of the MMC algorithm is achieved. The control objectives here are the injected grid currents, balancing the capacitor voltages of SMs at their setpoint, and minimizing the circulating currents in the MMC. The effectiveness of the proposed algorithm is verified by using the nonlinear simulation of MATLAB/SIMULINK.

DOI： 10.1109/MEPCON.2017.8301175

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2017 IEEE. This paper presents a decentralized Model Predictive Control (MPC) for Automatic Generation Control (AGC) of a realistic multi power system in Egypt with inherent nonlinearities. The Egyptian Power System (EPS) is decomposed into three dynamic subsystems which are non-reheat, reheat, and hydro power plants. Moreover, each subsystem has its private characteristics compared to the others. Therefore, each subsystem controller has been designed independently to guarantee the stability of the overall closed loop system. Hence, MPC is proposed for every subsystem separately to regulate the frequency and to track the load demands of EPS. The performance of the proposed decentralized MPC of each subsystem is compared with the centralized one at different operational scenarios. The results by nonlinear simulation MATLAB/SIMULINK for the generation control of EPS approves that the decentralized predictive model gives almost the same performance as the centralized one. However, the centralized model cannot address the large load disturbance and system parameters variation. In contrast, the decentralized MPC scheme is more robust and effective against all disturbances and operating conditions.

DOI： 10.1109/MEPCON.2017.8301183

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2017 IEEE. Recently, Modular Multilevel Converter (MMC) has become one of the most popular converters in medium/high power applications. Therefore, this paper presents a high-performance Model Predictive Control (MPC) in order to control the output voltage of the three phase MMC under various conditions and loads. Fast dynamic response, Low output harmonic distortion and voltage stability can be achieved through the proposed control system. The results by nonlinear simulation MATLAB/SIMULINK software for the MMC system approves that the proposed control system gives a high feasibility and better performance against several types of loads.

DOI： 10.1109/MEPCON.2017.8301323

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 In this paper, a novel optimal placement and parameter tuning approach for Power System Stabilizer (PSS) is proposed to damp both local and inter-area modes in mesh like power system. The design target is two-level PSS consisting of ΔP type local PSS and Δθ type Wide Area Damping Controller (WADC). For the PSS placement, modeshape with eigenvector sensitivity and coherency analysis are used to determine the appropriate placement of both local PSS and WADC. For the PSS parameter tuning, metaheuristics based approach via Mean Variance Mapping Optimization (MVMO) is employed in order to consider the time domain analysis. The proposed objective function designs at first the local PSS only to improve damping coefficient and damping ratio of eigenvalue. After that, it designs the WADC overlapping with already designed local PSS by time domain analysis, taking into account the transport delay in the remote signal between Phasor Measurement Unit (PMU) and PSS. The proposed method is applied in IEEE New England 39-Bus (NE 39-bus) system model. Then, modeshape and coherent grouping analysis give us understandable system aspect, the local PSS and the WADC optimized by using MVMO considering the transport delay improve both local and inter-area modes whereas a method ignoring the transport delay make system poorly damped.

DOI： 10.1016/j.ifacol.2018.11.477

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2013 IEEE. This paper presents robust virtual inertia control of an islanded microgrid considering high penetration of renewable energy sources (RESs). In such microgrids, the lack of system inertia due to the replacement of traditional generating units with a large amount of RESs causes undesirable influence to microgrid frequency stability, leading to weakening of the microgrid. In order to handle this challenge, the H ∞ robust control method is implemented to the virtual inertial control loop, taking into account the high penetration of RESs, thus enhancing the robust performance and stability of the microgrid during contingencies. The controller's robustness and performance are determined along with numerous disturbances and parametric uncertainties. The comparative study between H ∞ and optimal proportional-integral (PI)-based virtual inertia controller is also presented. The results show the superior robustness and control effect of the proposed H ∞ controller in terms of precise reference frequency tracking and disturbance attenuation over the optimal PI controller. It is validated that the proposed H ∞ -based virtual inertia controller successfully provides desired robust frequency support to a low-inertia islanded microgrid against high RESs penetration.

DOI： 10.1109/ACCESS.2017.2773486

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記述言語：日本語   掲載種別：記事・総説・解説・論説等（大学・研究所紀要）

電力・エネルギー部門（B部門）のみなさま，いつも部門の活動にご理解とご協力を賜りましてありがとうございます。本年度の電力・エネルギー部門大会は，明治大学での9月5日から7日にかけての開催となりました。2013年に開設された新しい中野キャンパスを使わせていただき，

DOI： 10.1541/ieejpes.138.61

Scopus

CiNii Article

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 Eastern Macedonia and Thrace Institute of Technology. This work presents a hybrid approach based on the genetic algorithm (GA) and moth swarm algorithm (MSA), namely genetic moth swarm algorithm (GMSA). Minimizing the electrical power loss in radial distribution systems (RDN) within the framework of system operation and under system constraints is the main objective of this study. In GMSA, the global search ability has been regulated by the incorporation of GA operations by the adaptive mutation operator on the reconnaissance phase using genetic pathfinder moths. In addition, the selection of artificial light sources has been expanded over the swarm. The representation of individuals within the three phases of MSA has been modified in term of quality and ratio. Elite individuals have been used to play different roles in order to reduce the design space and thus increase the exploitation ability. GMSA and other optimization methods have been carried out on the IEEE 33 and 69-bus power systems. The reduction of power loss and total system cost in addition to the improvement of the minimum bus voltage are simulated for the competitive algorithms under several power system constraints and conditions. The computational results proved the superiority of the GMSA compared with other techniques.

DOI： 10.25103/jestr.111.07

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018, Journal of Engineering Science and Technology Review. Recently, central tower receiver (CTR) power plant has been received a considerable attention as a promising technology for large solar thermal plants compared to different concentrated solar power (CSP) technologies. The present work adopted a facile controllable scheme using an artificial neural network (ANN) technique for modelling and simulating CTR plant with thermal energy storage (TES). Three different ANN models such as radial basis function (RBF), generalized regression neural network (GRNN), and multi-layer perceptron (MLP) were applied to assess the performance of CTR plant model. Based on statistical error analysis, MLP model was the optimal model compared to RBF and GRNN models. It is found that MLP model displays the best values for the coefficient of determination (R2=1), root mean square error (RMSE=0.003) and mean absolute error (MAE=0.0023) during ANN testing process. While, the values of R2, RMSE, and MAE were 0.999, 0.4817, and 0.32, respectively for GRNN model. Similarly, for RBF model, the values of R2, RMSE, and MAE were 0.9985, 0.2846, and 0.0674, respectively. The MLP provides a precise control over the discharge rate of the heat transfer fluid (HTF). Therefore, the receiver outlet temperature remains constant at the desired value regardless of the variations in direct solar radiation and receiver inlet temperature. Also, in this work, the algorithm of electrical generation methodology was modified for regulating CTR/TES output according to the hot storage tank (HST) conditions. The adopted model performance for a 40 MWe CTR power plant is validated by comparing its results with the obtained simulation results by System Advisor Model (SAM) software. The simulation results exhibit that the adopted CTR-ANN model and SAM results are in good agreement with each other. The reasonable simplicity and minimum required input data of CTR-ANN model make it an adequate tool to predict and analyse the performance of CTR technology in a simple and fixable manner.

DOI： 10.25103/jestr.116.13

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 This paper presents a Model Predictive Control (MPC) technique for frequency stabilization of renewable power systems with inherent nonlinearities. To prove the effectiveness of the proposed technique, the Egyptian Power System (EPS), which includes both conventional generation units (i.e., non-reheat, reheat and hydraulic power plants) and wind turbines is tested using Matlab/SIMULINK® software. Furthermore, the performance of the proposed MPC technique is compared with an optimal Proportional-Integral (PI) controller-based Particle Swarm Optimization (PSO) algorithm under different load profiles and system uncertainties. The simulation results emphasize the superior robustness of the proposed MPC-based LFC in comparison to the optimal PI controller.

DOI： 10.1016/j.ifacol.2018.11.715

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 This paper proposes a novel optimal Power System Stabilizer (PSS) design method to damp inter-area oscillations in power systems. As the input of PSS, remote signals which can be obtained by Phasor Measurement Units (PMUs) are used since remote signals represent global information of the power system. The method improves both small signal stability and transient stability, taking into consideration the fluctuation range of transport delay in the communication link between PMUs and PSSs, which may significantly affect the oscillation damping performance. In the design method, Mean Variance Mapping Optimization (MVMO) is employed to determine the PSS parameters. The proposed method is applied in IEEJ (The Institute of Electrical Engineers of Japan) WEST 10-machine system model. Then, network modeshape is used to select the most appropriate remote signal. As a result of optimal design, the PSSs with both local and remote signals can give better damping than the local PSS alone, even when maximum transport delay occurs, whereas PSS designed ignoring transport delay makes the system unstable in some cases of such delay.

DOI： 10.1016/j.ifacol.2018.11.683

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2018 Praise Worthy Prize S.r.l. - All rights reserved. This paper presents a real hybrid power system in Egypt, which includes both conventional generation units and Renewable Energy Sources (RESs) for studying the Load Frequency Control (LFC) problem. The conventional generation system in the Egyptian Power System (EPS) is decomposed into three dynamic subsystems; non-reheat, reheat and hydro power plants. Moreover, real wind speed data extracted from Zafarana location in Egypt is used for achieving a realistic wind power study. Each subsystem of the EPS has its own characteristics compared to the others. Moreover, the physical constraints of the governors and turbines such as Generation Rate Constraints (GRCs) of power plants and speed governor dead band (i.e., backlash) are taken into consideration. Therefore, this paper proposes a decentralized controller for each subsystem independently, to guarantee the stability of the overall closed-loop system. Hence, an optimal PID controller-based Particle Swarm Optimization (PSO) algorithm is proposed for every subsystem separately to regulate the frequency and track the load demands of the EPS. The performance of the proposed decentralized controller of each subsystem is compared to the centralized one under different operational scenarios. The EPS is tested using the nonlinear simulation by Matlab/SIMULINK. The obtained results reveal the superior robustness of the proposed decentralized controller against different load disturbance patterns, real wind power fluctuations and EPS uncertainties.

DOI： 10.15866/irecon.v6i1.14516

Scopus

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記述言語：日本語   掲載種別：研究論文（学術雑誌）

<p>1．はじめに</p><p>本稿では，「次世代電気エネルギーシステムにおける要素技術と発電・給配電技術の高機能協同研究委員会」における取組みの成果について紹介する。各技術の現状や実証事例から2030年をターゲットとし，想定される電気エネルギーシステムの姿を見据え今後の展望について情報発信</p>

DOI： 10.1541/ieejjournal.138.74

CiNii Article

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

New Zealand   Auckland   2017年12月04日  -  2017年12月07日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Malaysia   2017年11月14日  -  2017年11月15日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Malaysia   2017年11月14日  -  2017年11月15日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Malaysia   2017年11月14日  -  2017年11月15日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Malaysia   2017年11月14日  -  2017年11月15日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

China   Wehai   2017年07月04日  -  2017年07月07日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

China   Wehai   2017年07月04日  -  2017年07月07日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

China   Wehai   2017年07月04日  -  2017年07月07日

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2017 Praise Worthy Prize S.r.l. - All rights reserved. The use of capacitor banks is considered as the best-known technique for minimizing the line losses in various distribution networks. Therefore, the appropriate allocations and sizes of capacitors are very important because they affect the reduction of system losses and improvement of the system voltage profile. In this article, a novel algorithm called the moth swarm algorithm (MSA) is developed to optimally determine the locations and sizes for installing capacitor banks in various radial distribution systems (RDN). The objective function is adapted to reduce the system power losses and to reduce total system cost. Consequently, an increase in the annual net saving with inequity constraints on capacitor size and voltage limits considering multi-loading levels is obtained. The validation of the proposed algorithm has been tested and verified through small, medium and large scales of standard RDN of IEEE (22, 69, 85-bus) systems and also on ring main 33-bus system. In addition, the obtained results are compared with other algorithms to highlight the advantages of the proposed approach. Numerical results stated that the MSA can achieve optimal solutions for losses reduction and capacitor locations with the finest performance compared with many existing algorithms.

DOI： 10.15866/iree.v12i4.12492

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

©2006-2017 Asian Research Publishing Network (ARPN). All rights reserved.The concept of phasor measurement and its application in power system monitoring and control are introduced in this paper. The example of application of PMU in a Campus Wide Area Monitoring System (WAMS) is then elaborated. With the availability of synchrophasor data measurement, it makes possible to establish the power system monitoring by directly employing spectral analysis of power or phase angle response signals using Fourier Transforms or Short Time Fourier Transform, Prony or Wavelet analysis technique or any other combination among those methods. Moreover, using the wide area signal provided by PMU, power system stability control also gain benefit through the wide area control technique where the system provide a better response toward the inter-area oscillation compared to the conventional damping controller. Finally, at the end of this work, the application of phasor measurement technology in the small signal stability monitoring and the wide area control based on phasor measurement data are discussed.

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.3390/su9050773

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.4236/epe.2017.94B048

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.4236/epe.2017.94B047

記述言語：英語   掲載種別：研究論文（学術雑誌）

タイ   バンコク   2017年03月07日  -  2017年03月08日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2016 The Institute of Electrical Engineers of Japan. The electrical power system loses its synchronization when it is subjected to a sudden event, such as high or low voltage and/or current levels due to disturbances, for instance, short circuits, lightning and the switching of the inductive loads. This paper presents the analysis of a coordination technique of resistive type superconducting fault current limiter (RSFCL) and shunt Static synchronous compensator (STATCOM) to improve the power system transient stability. The main role of this combination model is to limit the fault current using superconducting technology and supporting the reactive power effectively using STATCOM. Transient stability investigations focus on studying the rotor oscillation of synchronous generators after the event of large unsettling influence. The objective is to demonstrate if the generator stays in synchronism after the fault eliminated. The output power, fault duration and generator rotor angle during the fault period are the most critical factors to be taken into consideration. A number of computer simulations using 'MATLAB/Simulink' were developed using single machine infinite bus (SMIB) to validate the models of RSFCL and STATCOM individually and combined at different fault duration.

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2016, International Consortium of Landscape and Ecological Engineering and Springer Japan. Ecosystem services in urban areas have deteriorated year on year due to increased urbanization. As a consequence of increased urbanization, floods threaten inhabitants of various cities in Japan. Although a conventional way of treating urban flooding is to construct sewage systems, alternative approaches have to be developed because of their expense in the context of the current financial crisis, especially in local governments. Rain gardens, a type of low-impact development, have recently been recommended as a best management practice for the treatment of stormwater runoff in Northern European countries, the USA, etc. While demand for rain gardens has been increasing in Japan, there is a lack of knowledge about their functions and characteristics. The present study aims to explain the function of rain gardens through a verification experiment and field survey. This study shows that rain gardens are suitable for dealing with low flow volumes of rainwater, although their suitability could be slightly changed by soil properties and catchment area. Our field survey indicated that rain gardens must be connected to a sewage system. In addition, like other green infrastructure, rain gardens require maintenance. The most frequent type of maintenance is the disposal of garbage, as garbage can block channels running between a rain garden and a conventional sewage system. Moreover, garbage build up can lead to the retention of rain water for more than 36 h, and this water can become a habitat for mosquito larvae.

DOI： 10.1007/s11355-016-0309-3

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2017 Universiti Putra Malaysia Press. Phasor Measurement Units (PMUs) are an important component in Wide Area Protection (WAP)- based operations in power systems. It is needed that a certain placement scheme of PMUs is suggested if power system scale gets larger. The optimal placement of PMU in power systems has been considered and formulated in order to reduce the number of installed PMUs while accomplishing a desired level of reliability of observation. Optimal PMU Placement (OPP) problem as the combinatorial optimization problem has been formulated to determine the minimum PMU location in the power system. In this paper, Disparity Evolution-type Genetic Algorithm (DEGA) based on disparity theory of evolution is applied. Genetic Algorithm (GA) is employed for the purpose of comparison with DEGA. The optimization model is solved for IEEE 118 standard bus system. DEGA can find better placement suggestion compared with GA because of the nature of evolution that models the double spiral structure of DNA to hold the diversity of population.

Scopus

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記述言語：日本語   掲載種別：記事・総説・解説・論説等（大学・研究所紀要）

<p>電力・エネルギー部門（B部門）のみなさま，いつも部門の活動にご理解とご協力を賜りましてありがとうございます。本年度の電力・エネルギー部門大会は，当初，熊本大学での開催を予定しておりましたが，ご存知のように昨年4月に発生した平成28年熊本地震の影響で開催地を急遽</p>

DOI： 10.1541/ieejpes.137.1

Scopus

CiNii Article

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記述言語：英語   掲載種別：研究論文（学術雑誌）

Concern of this work is analysis and short-term electricity demand forecasting under tropical condition using fuzzy approach. Two different demand models are proposed for dry season and rainy season to forecast a total load demand in Makassar, Indonesia for 24 hours ahead in each season. Based on the typical characteristic of seasonal demand, three inputs (time of load, temperature, and type of day) are used for load model in dry season, and four inputs (time of load, temperature, type of day, and rainfall) for load model in rainy season. Meanwhile, output is estimated load in related seasons. Some forecasting error analyses are applied to models. Under tested cases, both seasonal models have good forecasting results with MAPE values smaller than 2.95%. Estimated demand values when holidays and non-holidays in each season which are relatively close to actual load have confirmed effectiveness of the fuzzy based models.

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2016, Kerdphol et al.Background: An offline optimization approach based on energy storage management response in a microgrid was not fast and not reliable enough to control and adjust the system efficiently after the loss of the utility grid. Thus, it causes system inefficiency and collapse in the presence of violent changes of loads or outage of distributed generations. To solve such a problem, more real-time management is needed. Any changes in loads/generations should be compensated successfully by a battery energy storage system (BESS) in a short period of time. Methods: This paper presents a new method for the intelligent online management of both active and reactive power of a BESS based on a radial basis function neural network (RBFNN) incorporating particle swarm optimization (PSO) to prevent the stand-alone microgrid from instability and system collapse. BESS is centrally controlled by a controller developed by the proposed RBFNN. PSO is used to determine the optimized active and reactive power at every load/generation changing situation to monitor the effect of system frequency, voltage, and reference power regulation. These optimized power data are then employed as target data for the RBFNN generalization and training process. To enable the online updating of the operating parameters, the proposed RBFNN is implemented in the management process. With an appropriate RBFNN training, the optimum active and reactive power can directly be obtained without the necessity of performing the PSO optimization process at any change of load/generation. Results: The results show that the predictive results of the proposed RBFNN model only slightly differed from the target results based on PSO and have a minimum statistical error compared to the predictive results based on the multilayer perceptron neural network (MLPNN) model. Conclusions: The proposed RBFNN is suitable for the online estimation of the active and reactive power of BESS and can be used for real-time energy storage management as an online controller.

DOI： 10.1186/s13705-016-0071-2

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2016 Elsevier Ltd. All rights reserved.This article proposes a novel optimum sizing of battery energy storage system (BESS) using particle swarm optimization (PSO) incorporating dynamic demand response (DR) to improve a fast, smooth and secure system stability and performance, avoiding a microgrid from instability and system collapse during an emergency situation. An optimum size of BESS integrating DR can play an important role in frequency control of the microgrid in order to rapidly improve the system stability, restore the power equilibrium and prevent system collapse in the microgrid. The optimum size of BESS is evaluated by PSO incorporating DR based on frequency control of the microgrid. The results show that the optimum size of BESS-based PSO with DR can improve a fast, smooth and safe system performance and dynamic stability compared with the optimum size of BESS-based simulated annealing (SA) with DR and the conventional size. Nevertheless, the proposed sizing methods also determined the impact of BESS specified costs between modern and conventional BESS technologies. The capital cost, operating and maintenance cost of BESS were then investigated and compared in terms of economical performance for microgrid operations.

DOI： 10.1016/j.ijepes.2016.03.064

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

日本   千葉   2016年11月13日  -  2016年11月16日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2016 The Authors. Published by Elsevier Ltd.Due to the high penetration level of wind farms in the electrical grids, many grid connectivity issues interested and must be highlighted such as the improvement of Fault-ride through (FRT) capability of grid integrated doubly fed induction generators (DFIGs) based wind-turbine. In this paper the resistive superconducting fault current limiter (RSFCL) is proposed to minimize the fault current, enhance the FRT capability of DFIG, preserve DC-link voltage level and improve the power system quality under abnormal conditions. To achieve these objectives, the thermal modeling of the RSFCL is developed and its impact on the dynamic performance of DFIG is studied by using MATLAB/SIMULINK. The proposed scheme performance has been compared with the Outer Crowbar system to confirm its validity. Results stated that inserting the RSFCL during the fault is more effective than the Outer Crowbar in decreasing the rotor current and increasing the active power generation capacity of the wind turbine, thus enhancing the dc-link voltage, in addition to improve the fault ride-through (FRT) capability of the wind farm.

DOI： 10.1016/j.egypro.2016.10.152

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2016 The Authors. Published by Elsevier Ltd.The energy-saving operation in the thermal radiative cooling/heating system has been verified. The coefficient of performance (COP) has been experimentally evaluated by changing the water temperature and the flow rate to control the heat amount. The energy-saving operation has been achieved by increasing the flow rate for the same heat amount. The thermal comfort has also been evaluated by calculating the predicted mean vote (PMV). In the case of the energy-saving operation, it is expected that the heat amount by radiation is reduced and impair the thermal comfort. However, it is found that its reduction has a small effect on the thermal comfort.

DOI： 10.1016/j.egypro.2016.10.201

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2016 The Authors. Published by Elsevier Ltd.Recently, in Japan, the introduction of solar power generation has been rapidly increased for housing and even for non-residential buildings. Along with that, the maintenance and inspection operations are also expected to continue growing rapidly. Especially, as the solar power generation systems with an output more than 50 kW are obliged to be inspected by electrical chief engineer. Efficiency of the maintenance work of the solar power generation system has become an urgent task. Therefore, in our study, a model is constructed by the GIS (Geographic Information System) and GPS (Global Positioning System) and the UAV (Unmanned aerial vehicle) including infrared cameras and cloud computing and for the possible achievement of an efficient maintenance and asset management of the solar power generation system. Results show the arrangements can be done easily with providing enough data following the suggested scheme.

DOI： 10.1016/j.egypro.2016.10.133

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2016 The Authors. Published by Elsevier Ltd.Smart Grid construction within conventional network is a step to digitalize and optimize the present grid. However, smart grid itself should be a part of the solution rather than being a new burden. According to this research, Electric Vehicles (EV) in the form of Vehicle-to-Grid (V2G) can play their own role for frequency control in an isolated power system. On the other hand, Microgrids mostly use Renewable Energy Systems (RES) in electrical power production that are naturally fluctuating, in a time there are increasing trends to install the controllable loads such as Heat Pumps (HPs) and V2Gs. On the other hand, operating manners and uncertainties in power systems cause the classic controllers to be unable to provide a proper performance over a wide range of operating conditions. In order to overcome such issues, this paper addresses a control scheme approach using Coefficient Diagram Method (CDM) technique to enhance the system validity and robustness against uncertainties. The proposed scheme suggests a parallel connection of CDM and PI controllers in which the performance has been compared with only conventional controller showing that the proposed scheme has superior validity. Different operation schemes have been simulated showing the flexibility of V2G utilization in the modern power system.

DOI： 10.1016/j.egypro.2016.10.187

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2016 Elsevier Ltd. All rights reserved.The main challenge in integrating a Battery Energy Storage System (BESS) into a microgrid is to evaluate an optimum size of BESS to prevent the microgrid from instability and system collapse. The installation of BESS at a random size or non-optimum size can increase in cost, system losses and larger BESS capacity. Thus, this paper proposes the new method to evaluate an optimum size of BESS at minimal total BESS cost by using particle swarm optimization (PSO)-based frequency control of the stand-alone microgrid. The research target is to propose an optimum size of BESS by using the PSO method-based frequency control in order to prevent the microgrid from instability and system collapse after the loss of the utility grid (e.g., blackout or disasters) and minimize the total cost of BESS for 15 years installation in the microgrid. Then, the economical performance of BESS with modern different storage technologies is investigated and compared in the typical microgrid. Results show that the optimum size of BESS-based PSO method can achieve higher dynamic performance of the system than the optimum size of BESS-based analytic method and the conventional size of BESS. In terms of BESS economical performance with modern storage technologies, the installation of the polysulfide-bromine BESS is likely to be more cost-effective than the installation of the vanadium redox BESS for 15 years installation in the typical microgrid. It is concluded that the proposed PSO method-based frequency control can improve significantly power system stability, grid security, and planning flexibility for the microgrid system. At the same time, it can fulfill the frequency control requirements with a high economic profitability.

DOI： 10.1016/j.ijepes.2016.02.006

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Malaysia   Kuala Lumpur   2016年08月22日  -  2016年08月26日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Japan   Okinawa   2016年07月03日  -  2016年07月07日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Japan   Okinawa   2016年07月03日  -  2016年07月07日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Japan   Okinawa   2016年07月03日  -  2016年07月07日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Japan   Okinawa   2016年07月03日  -  2016年07月07日

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2015 IEEE. This paper analyses and evaluates the amount of solar radiation based on Digital Surface Model (DSM) information by using Geographic Information System (GIS). This study has developed an apparatus to evaluate suitable places for Photovoltaic (PV) panel installation based on the amount of solar radiation analysis. In this study, the area of Kitakyushu city is selected to be evaluated by the proposed tool as an example in the sense that PV panels can be installed optimally. The results show that the proposed tool based on DSM information by using GIS can precisely determine the amount of solar radiation considering the solar orbit under the condition of no clouds, and evaluate an optimum location for PV installation. In the future the results can be applied to a PV power generation analysis after superimposing a present weather condition or weather forecasting data.

DOI： 10.1109/APPEEC.2015.7380922

Scopus

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記述言語：英語   掲載種別：記事・総説・解説・論説等（学術雑誌）

© 2015 Elsevier Ltd. Published by Elsevier Ltd. Integration of Distributed Renewable Generation (DRG) to the future Smart Grid (SG) is one of the important considerations that is highly prioritized in the SG development roadmap by most of the countries including Malaysia. The plausible way of this integration is the enhancement of information and bidirectional communication infrastructure for energy monitoring and controlling facilities. However, urgency of data delivery through maintaining critical time condition is not crucial in these facilities. In this paper, we have surveyed state-of-the-art protocols for different Wireless Sensor Networks (WSNs) with the aim of realizing communication infrastructure for DRG in Malaysia. Based on the analytical results from surveys, data communication for DRG should be efficient, flexible, reliable, cost effective, and secured. To meet this achievement, IEEE802.15.4 supported ZigBee PRO protocol together with sensors and embedded system is shown as Wireless Sensor (WS) for DRG bidirectional network with prospect of attaining data monitoring facilities. The prospect towards utilizing ZigBee PRO protocol can be a cost effective option for full integration of intelligent DRG and small scale Building-Integrated Photovoltaic (BIPV)/Feed-in-Tariff (FiT) under SG roadmap (Phase4: 2016-2017) conducted by Malaysia national utility company, Tenaga Nasional Berhad (TNB). Moreover, we have provided a direction to utilize the effectiveness of ZigBee-WS network with the existing optical communication backbone for data importing from the end DRG site to the TNB control center. A comparative study is carried out among developing countries on recent trends of SG progress which reveals that some common projects like smart metering and DRG integration are on priority.

DOI： 10.1016/j.rser.2015.09.020

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2016 Praise Worthy Prize S.r.l. - All rights reserved.As an installation of Battery Energy Storage Systems (BESS) at a non-optimum size and location in a microgrid can cause stability issues, increase in cost, system losses and larger BESS size. Thus, the optimum size and location of BESS is a main challenge for combining BESS into a microgrid. For this reason, this paper proposes a novel method to evaluate an optimal size and location of the BESS using the Radial Basis Function Neural Networks (RBFNN). The proposed method consists of a two-stage based on an optimum size process and optimum location process. In the first stage, the optimal size of the BESS is evaluated using the RBFNN based on frequency and voltage control so that frequency and voltage of the microgrid can return to nominal values under the sudden changes in the microgrid. In the second stage, the optimal location of the BESS is determined using the RBFNN based on minimizing power losses in the microgrid. With a suitable RBFNN training, the results indicate that the proposed RBFNN method can achieve the superb performances in predicting the optimum size and location of the BESS with a minor change compared to the measured data based on the simulation. Therefore, it is obvious that if BESS is located at the optimum location and has the optimum size, it can save an enormous amount of power in a microgrid and can avoid the microgrid from instability and system collapse.

DOI： 10.15866/iree.v11i1.7718

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2015 IEEE. Network reliability of distribution system is one of the key performance indices to be realized with many efforts. Installing Distribution Generation (DG) on radial distribution network closer to the customers is one of the efforts, which can improve the indices. This paper will present a GA method to determine the best location and capacity of DG placement with minimum power losses as an objective function to achieve optimum result. By DG placement in the network, except improve the voltage profile and power losses also the reliability indices such as SAIDI, SAIFI and EENS. Therefore the reliability will experience an improvement than before. For calculating and analyzing the reliability indices it uses ETAP 12.6 software which is separate analysis with determine the position and capacity optimization method. This concept will realize by simulating in the 132 bus radial distribution system and considering into two schemes, the base load scheme and full load scheme.

DOI： 10.1109/ICEEI.2015.7352567

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2015 IEEE. Reliability improvement is one of the important things for electrical distribution company. By using some devices such as recloser and sectionalizing switch will reduce the amount of interrupted load during the fault. However, improvement of reliability need a cost, it can be said that reliability of the system and investment cost is comparable. In this paper, reliability of distribution network is assessed by considering reliability cost worth. A methodology based on cost worth analysis for optimal switch placement in distribution system network is proposed. This paper study has been conducted on the existing of Indonesian radial electrical distribution network.

DOI： 10.1109/ICEEI.2015.7352564

Scopus

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記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2015 Wiley Periodicals, Inc. This paper presents a simple analysis tool for torsional vibration of the rotor shaft of a turbine generator which is interconnected with a power system with self-commutated converters. The evaluation is based on analysis of measurement data in the field and instantaneous value-based power system simulation. A number of power converters with large capacity are installed in industrial power systems. Especially, interharmonics originating from self-commutated converters cause torsional vibration at the rotor shaft of rotating machines. The interaction between rotating machines and converters is known as sub-synchronous torsional interaction. The resonance between interharmonics from converters and the natural frequency of the rotor shaft causes large torsional vibrations, leading to shaft damage. In this paper, the influence of interharmonics on turbine generators is investigated. If there were air gap torque fluctuations with a frequency near the natural frequency caused by interharmonics, which have frequencies below 100 Hz of the sideband wave caused by asynchronous pulse width modulation, the rotor shaft may be damaged by the torsional vibration. In this paper, the emerging condition of the torsional vibration and the impact on the generator are investigated.

DOI： 10.1002/eej.22741

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

UAE   Sharjah   2015年11月24日  -  2015年11月26日

DOI： 10.1109/EPECS.2015.7368524

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

オーストラリア   ブリスベン   2015年11月15日  -  2015年11月18日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Thailand   Bangkok   2015年11月04日  -  2015年11月06日

DOI： 10.1109/ISGT-Asia.2015.7387074

Scopus

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Japan   Kitakyusyu   2015年09月10日  -  2015年09月12日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Japan   Kitakyusyu   2015年09月10日  -  2015年09月12日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Japan   Kitakyusyu   2015年09月10日  -  2015年09月12日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Japan   Kitakyusyu   2015年09月10日  -  2015年09月12日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Japan   Kitakyusyu   2015年09月10日  -  2015年09月12日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

中華人民共和国   香港   2015年07月05日  -  2015年07月09日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

中華人民共和国   香港   2015年07月05日  -  2015年07月09日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

中華人民共和国   香港   2015年07月05日  -  2015年07月09日

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2014 Published by Elsevier Ltd. This study employs the Hilbert-Huang transform (HHT), the wavelet transform (WLT) and the fast Fourier transform (FFT) to analyze the inter-area (global) oscillation characteristics of Western Japan 60 Hz power system. The data are collected from a network of distributed phasor measurement units (PMUs) through a national project called Campus wide area monitoring system (Campus WAMS). In the present paper the Campus WAMS is introduced, and then the recorded phase difference data are analyzed using WLT, FFT and HHT methods, respectively. A comprehensive comparison is performed, and it is demonstrated that HHT offers more flexibility in terms of detailed profile and enough description, which can be beneficial for power system small signal stability analysts following estimation of system low-frequency oscillation. The results could be useful for on-line tuning of power system stabilizers.

DOI： 10.1016/j.ijepes.2014.11.004

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84919786571&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.15866/iree.v10i2.5350

Scopus

記述言語：日本語   掲載種別：記事・総説・解説・論説等（大学・研究所紀要）

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84923879031&origin=inward

担当区分：筆頭著者   記述言語：日本語   掲載種別：記事・総説・解説・論説等（学術雑誌）

DOI： 10.1541/ieejpes.135.NL5_6

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/130005068031

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

エジプト   回路   2014年12月23日  -  2014年12月25日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Japan   Kitakyusyu   2014年12月20日  -  2014年12月21日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Japan   Kitakyusyu   2014年12月20日  -  2014年12月21日

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.1016/j.ijepes.2014.05.057

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2014 ACPE. Wind power is among the rapidly spreading renewable energy sources in the past years. It has been a trend that renewable energy sources including wind generators be either connected in the distribution level near the loads, or be operated in islanded operation. However, since wind generators are highly dependent on wind speed which changes throughout the day, wind output of wind power plants are highly expected to fluctuate. This paper proposes a pitch angle control method using Fuzzy logic and PI controllers for a wind power plant. The pitch angle control is designed to work with conventional PI controller to vary its parameters to smoothen the wind turbine output in cases of varying wind speeds. The effectiveness of the proposed control method is demonstrated through simulation in Matlab/Simulink environment.

DOI： 10.1109/AUPEC.2014.6966531

Scopus

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記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Japan   Kyoto   2014年11月17日  -  2014年11月20日

記述言語：英語   掲載種別：研究論文（学術雑誌）

© 2014 The Institute of Electrical Engineers of Japan. This paper presents a simple analysis tool for torsional vibration of the rotor shaft of turbine generator which is interconnected with a power system with self-commutated converters. The evaluation is based on the analysis of measurement data in the field and the instantaneous value based power system simulation. A number of power converters with large capacity are installed in industrial power systems. Especially, interharmonics originated from self-commutated converters cause the torsional vibration at the rotor shaft of rotating machines. The interaction between rotating machine and converters is known as sub-synchronous torsional interaction. The resonance between interharmonics from converters and the natural frequency of the rotor shaft cause the large torsional vibration, which leads to the shaft damage. In this paper, the influence of interharmonics to turbine generators is investigated. If there were air gap torque fluctuations with frequency near the natural frequency caused by interharmonics, which have frequency less than 100 Hz of sideband wave caused by asynchronous pulse width modulation, the rotor shaft might be damaged by the torsional vibration. In this paper, the emerging condition of the torsional vibration and the impact to the generator are investigated.

DOI： 10.1541/ieejpes.134.900

Scopus

CiNii Article

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84908482092&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

UAE   2014年10月29日  -  2014年10月31日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

UAE   Dubai   2014年10月29日  -  2014年10月31日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

U.A.E   Dubai   2014年10月29日  -  2014年10月31日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

U.A.E   Dubai   2014年10月29日  -  2014年10月31日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

U.A.E   Sharjah-Dubai   2014年10月29日  -  2014年10月31日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

U.A.E   Sharjah-Dubai   2014年10月29日  -  2014年10月31日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

トルコ   イスタンブール   2014年10月12日  -  2014年10月15日

DOI： 10.1109/ISGTEurope.2014.7028895

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

トルコ   イスタンブール   2014年10月12日  -  2014年10月15日

記述言語：英語   掲載種別：研究論文（学術雑誌）

© School of Engineering, Taylor’s University. In general, Light Emitting Diode (LED) is low power consumption, and Photovoltaic (PV) generation of Renewable Energy is effective as energy creation. However, LED applications have a problem of LED Circuit Radiation Noise and PV generation applications have a problem of the Output Power fluctuation in the weather. This paper will be proposed as an especial approach of the energy reduction to contribute to the realization of the low carbon society in the world. In this research, without using Common Mode Choke (CMC) Noise Cut filter, the Radiation Noise reduction result in World Standard Guideline by the selection of a simple circuit of the most effective LED lighting of various power reduction methods have been confirmed by the examinations. Additionally, in order to investigate the lighting specification, the simple Lighting evaluation equipment has been developed. As an energy fluctuation reduction research, the new control system of the PV fluctuation electric power using EV battery charge-discharge electric power that is able to be easily connected with a Power Conditioning System (PCS) input is proposed. A simulation result using the actual PV generator output data is provided to confirm the effectiveness of Simple Moving Average (SMA) method. Moreover, the outline of a new large area monitoring control GIS system for the implementation of the PV generator power prognostication without the weather estimation is introduced.

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84949670401&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

South Africa   Cape Town   2014年08月24日  -  2014年08月29日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

ポーランド   ヴロツワフ   2014年08月18日  -  2014年08月22日

DOI： 10.1109/PSCC.2014.7038303

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.1016/j.ijepes.2013.11.002

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© 2014 Power Systems Computation Conference. This paper presents a method for the tuning of a power system stabilizer (PSS) for damping inter-area low-frequency oscillations based on wide area phasor measurements and robust controller design with the linear matrix inequality (LMI) approach. The dynamics of a power system is identified as an approximate model based on voltage phasors obtained by the wide area measurement system (WAMS). Then, a PSS is designed by applying LMI approach on the approximate model. The inter-area mode should be damped effectively by a well-tuned PSS based on the state monitoring with the modeling error compensation considered. The proposed method has been applied to a simple two-area power system model to demonstrate the effectiveness of this approach.

DOI： 10.1109/PSCC.2014.7038434

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84946692454&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.1109/TSTE.2013.2290126

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

© IFAC. This paper presents the applications of Phasor Measurement Unit (PMU) for assessing the dynamics and stability of wide area interconnected power system. Wide area measurement system for the power system dynamical assessment which has been developed by our group is installed at the power outlets in some university campuses in Japan. Thus, it is called Campus WAMS, and the system was also applied to Singapore-Malaysia power system. Some results based on the long term continuous monitoring are described in this paper.

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84929791796&origin=inward

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Spain   Madrid   2013年10月20日  -  2013年10月23日

DOI： 10.1109/ICRERA.2013.6749846

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

USA   California   2013年10月20日  -  2013年10月23日

DOI： 10.1109/GHTC.2013.6713661

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（研究会，シンポジウム資料等）

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/10031200822

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Canada   Halifax   2013年08月21日  -  2013年08月23日

DOI： 10.1109/EPEC.2013.6802920

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Korea   Jeju   2013年07月08日  -  2013年07月11日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Korea   Jeju   2013年07月08日  -  2013年07月11日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Korea   Jeju   2013年07月08日  -  2013年07月11日

記述言語：日本語   掲載種別：研究論文（研究会，シンポジウム資料等）

CiNii Article

その他リンク： https://ci.nii.ac.jp/naid/10031155271

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

フランス   Toulouse   2012年09月02日  -  2012年09月05日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

フランス   Toulouse   2012年09月02日  -  2012年09月05日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

日本   金沢   2012年07月08日  -  2012年07月10日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

日本   金沢   2012年07月08日  -  2012年07月10日

担当区分：責任著者   記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

インドネシア   バリ   2012年07月03日  -  2012年07月05日

記述言語：英語   掲載種別：研究論文（学術雑誌）

This paper presents the applications of Phasor Measurement Unit (PMU) for monitoring the stability of wide area interconnected power system and node voltage measurement for monitoring the power flows inside a building. Wide area measurement system for the power system stability which has been developed by our group is installed at the power outlets in some university campuses in Japan. The system was also applied to Singapore-Malaysia power system. Others, the power flows on the wiring lines in a building are monitored by simultaneous measurements of node voltage at power outlets. Some results are shown in this paper.

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=84864691528&origin=inward

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Thailand   Phuket   2012年04月02日  -  2012年04月05日

DOI： 10.2316/P.2012.768-110

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Thailand   Phuket   2012年04月02日  -  2012年04月05日

DOI： 10.2316/P.2012.768-111

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Thailand   Phuket   2012年04月02日  -  2012年04月05日

DOI： 10.2316/P.2012.768-112

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

China   Shanghai   2012年03月27日  -  2012年03月29日

DOI： 10.1109/APPEEC.2012.6306935

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

China   Shangahai   2012年03月27日  -  2012年03月29日

DOI： 10.1109/APPEEC.2012.6307577

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

China   Shangahai   2012年03月27日  -  2012年03月29日

DOI： 10.1109/APPEEC.2012.6307496

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

China   Shanghai   2012年03月27日  -  2012年03月29日

DOI： 10.1109/APPEEC.2012.6306962

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

China   Shanghai   2012年03月27日  -  2012年03月29日

DOI： 10.1109/APPEEC.2012.6307705

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

China   Shanghai   2012年03月27日  -  2012年03月29日

DOI： 10.1109/APPEEC.2012.6307454

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.1109/TSG.2012.2196806

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

UAE   2011年11月15日  -  2011年11月17日

DOI： 10.1109/EPECS.2011.6126834

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

UAE   2011年11月15日  -  2011年11月17日

DOI： 10.1109/EPECS.2011.6126850

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

China   Beijing  

DOI： 10.1109/APAP.2011.6180662

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

DOI： 10.1109/IAS.2011.6074411

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Sweden   Stochholm   2011年08月22日  -  2011年08月26日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Hong Kong   Hong Kong   2011年07月10日  -  2011年07月14日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Hong Kong   Hong Kong   2011年07月10日  -  2011年07月14日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.1002/etep.446

Scopus

記述言語：英語   掲載種別：研究論文（学術雑誌）

Phasor Measurement Unit (PMU) is an apparatus which detects the absolute value of phase angle in sinusoidal signal. When more than two units are located distantly apart from each other, and they are synchronized with GPS signal which tells us the information on exact time, it becomes ready to get phase differences between two distant places. Thus, PMU with GPS receiver is applied to the monitoring of AC power system dynamics and usually installed at substations of transmission lines. The states of power network are uniquely determined by the active and reactive power and the magnitude and phase angle of voltage in each node. Among these values the phase angle had not been easily obtained until the scheme of time synchronism with GPS appeared. In this report, the history of GPS and PMU, and the current status of the applications in power systems in the world are presented. In Japan we are developing a power system monitoring system with PMUs installed at University's campuses with 100 V outlets, which is called Campus WAMS. This report also introduces some results from the Campus WAMS briefly. © 2010 The Institute of Electrical Engineers of Japan.

DOI： 10.1541/ieejpes.130.791

Scopus

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=78049460581&origin=inward

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Singapore   Singapore   2010年10月27日  -  2010年10月29日

DOI： 10.1109/IPECON.2010.5697043

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

UK   Cardiff   2010年08月31日  -  2010年09月03日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Korea   Pusan   2010年07月11日  -  2010年07月13日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Korea   Pusan   2010年07月11日  -  2010年07月13日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Korea   Pusan   2010年07月11日  -  2010年07月13日

記述言語：英語   掲載種別：研究論文（学術雑誌）

DOI： 10.1002/tee.20556

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

France   Paris   2010年05月31日  -  2010年06月04日

DOI： 10.1109/ISCAS.2010.5537070

Scopus

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

China   2010年03月28日  -  2010年03月31日

DOI： 10.1109/APPEEC.2010.5448425

Scopus

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

主要雑誌

記述言語：英語   掲載種別：研究論文（学術雑誌）

主要雑誌

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Singapore   Singapore   2009年11月23日  -  2009年11月26日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

China   瀋陽   2009年07月05日  -  2009年07月09日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

China   瀋陽   2009年07月05日  -  2009年07月09日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

China   瀋陽   2009年07月05日  -  2009年07月09日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

China   瀋陽   2009年07月05日  -  2009年07月09日

記述言語：英語   掲載種別：研究論文（学術雑誌）

主要雑誌

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Malaysia   Johor Bahru   2008年12月01日  -  2008年12月03日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Malaysia   Johor Bahru   2008年12月01日  -  2008年12月03日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Singapore   2008年11月24日  -  2008年11月27日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Singapore   2008年11月24日  -  2008年11月27日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

India   Hyderabad   2008年11月16日  -  2008年11月20日

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Scotland   Glasgow   2008年07月13日  -  2008年07月18日

主要論文集（会議） 代表的研究業績

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Okinawa   2008年07月06日  -  2008年07月10日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Okinawa   2008年07月06日  -  2008年07月10日

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

主要雑誌 代表的研究業績

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Singapore   2007年12月03日  -  2007年12月06日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Singapore   2007年12月03日  -  2007年12月06日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Singapore   Singapore   2007年11月03日  -  2007年11月06日

主要論文集（会議）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Singapore   Singapore   2007年11月03日  -  2007年11月06日

主要論文集（会議）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Switzerland   Lausanne   2007年07月01日  -  2007年07月05日

主要論文集（会議）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Switzerland   Lausanne   2007年07月01日  -  2007年07月05日

主要論文集（会議）

記述言語：英語   掲載種別：研究論文（学術雑誌）

代表的研究業績

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Thailand   Phuket   2007年04月  -  2007年04月

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Thailand   Phuket   2007年04月  -  2007年04月

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Thailand   Phuket   2007年04月  -  2007年04月

記述言語：英語   掲載種別：研究論文（学術雑誌）

主要雑誌

記述言語：日本語   掲載種別：研究論文（学術雑誌）

主要雑誌

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

2006年11月  -  2006年11月

主要論文集（会議）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

2006年11月  -  2006年11月

主要論文集（会議）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

主要雑誌

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Korea   2006年07月  -  2006年07月

記述言語：英語   掲載種別：研究論文（学術雑誌）

代表的研究業績

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Singapore   Singapore   2005年11月29日  -  2005年12月02日

主要論文集（会議）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Singapore   Singapore   2005年11月29日  -  2005年12月02日

主要論文集（会議）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Belgium   Liege   2005年08月22日  -  2005年08月26日

主要論文集（会議）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Belgium   Liege   2005年08月22日  -  2005年08月26日

主要論文集（会議）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Belgium   Liege   2005年08月22日  -  2005年08月26日

主要論文集（会議）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Belgium   Liege   2005年08月22日  -  2005年08月26日

主要論文集（会議）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Belgium   Liege   2005年08月22日  -  2005年08月26日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Russia   St. Petersburg   2005年06月27日  -  2005年06月30日

主要論文集（会議）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Russia   St. Petersburg   2005年06月27日  -  2005年06月30日

主要論文集（会議）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

Thailand   Krabi   2005年04月18日  -  2005年04月20日

記述言語：日本語   掲載種別：研究論文（学術雑誌）

代表的研究業績

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

シンガポール   シンガポール   2004年11月21日  -  2004年11月24日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

シンガポール   シンガポール   2004年11月21日  -  2004年11月24日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

シンガポール   シンガポール   2004年11月21日  -  2004年11月24日

記述言語：英語   掲載種別：研究論文（国際会議プロシーディングス）

シンガポール   シンガポール   2004年11月21日  -  2004年11月24日

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

アメリカ   New York   2004年10月  -  2004年10月

記述言語：英語   掲載種別：研究論文（学術雑誌）

アメリカ   New York   2004年10月  -  2004年10月

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

Sapporo   2004年07月  -  2004年07月

記述言語：英語   掲載種別：研究論文（学術雑誌）

Sapporo   2004年07月  -  2004年07月

記述言語：英語   掲載種別：研究論文（学術雑誌）

Sapporo   2004年07月  -  2004年07月

記述言語：英語   掲載種別：研究論文（学術雑誌）

Sapporo   2004年07月  -  2004年07月

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

カナダ   Tronto   2003年07月  -  2003年07月

記述言語：英語   掲載種別：研究論文（学術雑誌）

カナダ   Tronto   2003年07月  -  2003年07月

記述言語：英語   掲載種別：研究論文（学術雑誌）

カナダ   Tronto   2003年07月  -  2003年07月

記述言語：英語   掲載種別：研究論文（学術雑誌）

イタリア   Bologna   2003年06月  -  2003年06月

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

タイ   Bangkok   2003年05月  -  2003年05月

記述言語：英語   掲載種別：研究論文（学術雑誌）

イタリア   Bologna   2003年05月  -  2003年05月

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

アメリカ   2002年11月  -  2002年11月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2002年04月  -  2002年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2002年04月  -  2002年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2002年04月  -  2002年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2002年04月  -  2002年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2002年04月  -  2002年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2002年04月  -  2002年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2002年04月  -  2002年04月

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2001年04月  -  2001年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2001年04月  -  2001年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2001年04月  -  2001年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2001年04月  -  2001年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2001年04月  -  2001年04月

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2000年04月  -  2000年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2000年04月  -  2000年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2000年04月  -  2000年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2000年04月  -  2000年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

2000年04月  -  2000年04月

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

1999年04月  -  1999年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

1999年04月  -  1999年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

1999年04月  -  1999年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

1999年04月  -  1999年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

1999年04月  -  1999年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

1999年04月  -  1999年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

1999年04月  -  1999年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

1999年04月  -  1999年04月

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

1998年04月  -  1998年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

1998年04月  -  1998年04月

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

1997年04月  -  1997年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

1997年04月  -  1997年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

1997年04月  -  1997年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

1997年04月  -  1997年04月

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

1996年04月  -  1996年04月

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

1996年04月  -  1996年04月

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

1986年04月  -  1986年04月

記述言語：日本語   掲載種別：研究論文（その他学術会議資料等）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：日本語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（学術雑誌）

記述言語：英語   掲載種別：研究論文（その他学術会議資料等）

1982年04月  -  1982年04月