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• Monitoring Large-Scale PV Generation Infeed on Grid Frequency using Synchrophasor Measurement: Recent Perspective from Kyushu Island

  Kerdphol T., Matsukawa Y., Watanabe M., Mitani Y.

  Proceedings of the IEEE Power Engineering Society Transmission and Distribution Conference    2020-October   2020年10月  [査読有り]

   概要を見る

  © 2020 IEEE. The growing power in-feed of renewable/non-synchronous energy (e.g., solar/wind energy) in Japan power grid has raised serious concerns about frequency stability and control. The intermittent power output and lack of inertia property from large-scale solar/photovoltaic (PV) farms critically affect the balance between power generation and demand. Subsequently, the dynamic of grid frequency is severely deteriorated, resulting in rapid grid frequency deviations, and in the worst-case, power blackout. This paper proposes an advanced application of synchrophasor measurements for monitoring the dynamics and stability of Kyushu Island power system in the presence of large-scale solar penetration. In such a system, the dynamic analysis of the rate of change of frequency (RoCoF) is of great importance, reflecting the stability aspect of the system. Thus, contrastive scenarios of high-resolution synchrophasor measurements recorded in Kyushu region are analyzed against different levels of solar penetration. The results reveal that monitoring ROCOF and grid frequency variations in each scenario not only indicate the oscillatory behavior of the Kyushu power grid, but also provide useful information of the wide-area dynamic stability.

  DOI Scopus

• Fuel Cell Co-generation and PCS Control for Suppressing Frequency and Voltage Fluctuation due to PV Power

  Shuhei Yamamoto, Yasunori Mitani, Masayuki Watanabe, Akihiro Satake, Yoshiaki Ushifusa

  2020 7th International Conference on Power and Energy Systems Engineering      2020年09月  [査読有り]

• Adaptive Remedial Action Scheme based on Phasor Measurement Unit

  A.Y. Salile , N. Hariyanto, M. Watanabe, F.S. Rahman

  SEST 2020 - 3rd International Conference on Smart Energy Systems and Technologies      2020年09月  [査読有り]

   概要を見る

  © 2020 IEEE. Most of the blackout occurrences are caused by non-credible contingency events and often, the response to these situations is not prepared. One of such contingency event is the violation of transmission line limits leading to the disconnection of multiple highly loaded transmission lines. To prevent this event, knowing the loadability of the transmission line is important. In this research, a method to obtain the loadability of the transmission line is proposed. The data from the phasor measurement units are utilized to obtain the characteristics of the transmission lines (i.e. reactance, voltage drop pattern). Then, the loadability of the transmission lines in terms of thermal, voltage drop, and stability limits are calculated. The adaptive remedial action scheme (RAS) is also designed to maintain power transfer within a safe limit by load shedding and/or generation rejection. This scheme will update the total amount of load shedding or generation rejection and select the target based on the sensitivity of voltage to active power change. The method is applied to the Java-Bali system, in which a high amount of power is transferred from eastern to the western part through the transmission lines at the north and south corridors and hence, knowing the loadability limits of each corridor is important. Using the proposed method, the separation of western and eastern Java could be effectively prevented.

  DOI Scopus

• Stability assessment of multiple virtual synchronous machines for microgrid frequency stabilization

  Kerdphol T., Watanabe M., Mitani Y., Turschner D., Beck H.P.

  IEEE Power and Energy Society General Meeting    2020-August   2020年08月  [査読有り]

   概要を見る

  © 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 Scopus

• Fast Coherent Area-based Phasor Measurement Unit Placement for Power System Dynamic Vulnerability Assessment via Hierarchical Clustering

  Y. Matsukawa, M. Watanabe

  2020 IEEE Power and Energy Society Innovative Smart Grid Technologies Conference, ISGT 2020      2020年02月  [査読有り]

   概要を見る

  © 2020 IEEE. Phasor Measurement Unit (PMU) is one of the most important components of Wide Area Measurement System (WAMS) as the measurement device. However, since the PMU cost is still expensive, its location must be optimally determined. This paper proposes the optimal PMU placement scheme for the dynamic vulnerability assessment evaluating the Center-of-Inertia (COI) based frequency in fast coherent areas, identified by a novel Hierarchal Clustering (HC) method called HC-max which evaluates the clustering result via point biserial correlation coefficient. HC-max is superior in terms of clustering precision and less parameter compared to nonhierarchical clustering. After determination of fast coherent areas, PMUs are optimally placed via evaluation function which minimizes the COI based area frequency estimation error by bus frequency. The results show that the placed PMU can well estimate the COI based area frequency and detect the area out of step signature.

  DOI Scopus

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• Power System Monitoring and Control

  Hassan Bevrani, Masayuki Watanabe, Yasunori Mitani ( 共著 )

  Wiley-IEEE Press  2014年06月 ISBN: 978-1-118-45069-7

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• 位相・潮流情報を用いた系統慣性推定における位相観測地点決定手法

  西川倫太郎

  2020年度（第73回）電気・情報関係学会九州支部連合大会  2020年09月  -  2020年09月   

• 位相・潮流情報を用いた系統慣性推定手法に関する評価

  玉木貴裕

  電気学会電力技術・電力系統技術合同研究会  2020年09月  -  2020年09月   

• 燃料電池型コージェネレーションシステムの電力変換余力を活用した太陽光発電電力大量導入時の配電系統電圧変動調節手法

  山本周平

  電気学会電力技術・電力系統技術合同研究会  2020年09月  -  2020年09月   

• 二機系統モデルを用いた電力系統の慣性推定手法の検討

  永瀬健太

  電気学会電力技術・電力系統技術合同研究会  2020年09月  -  2020年09月   

• 同期位相計測を用いた系統周波数の時間変化率推定法

  武富大輝

  令和2年電気学会電力・エネルギー部門大会  2020年09月  -  2020年09月   

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• 電気設備学会全国大会発表奨励賞

  2011年11月25日   社団法人電気設備学会   日本国

  受賞者：  渡邊政幸

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• 再生可能エネルギー有効活用のための広域情報に基づく電力システム信頼度監視制御

  基盤研究(C)

  研究期間:  2015年04月  -  2018年03月

  研究課題番号:  15K05943

• 需要家電気エネルギーシステム監視制御による供給信頼度マネジメント

  若手研究(B)

  研究期間:  2012年04月  -  2014年03月

  研究課題番号:  24760236

• 小規模分散型電力供給システムオンライン監視に基づく協調運用制御

  若手研究(B)

  研究期間:  2009年04月  -  2011年03月

  研究課題番号:  21760217

• 広域位相計測に基づく電気エネルギーシステムオンライン適応制御

  若手研究(B)

  研究期間:  2007年06月  -  2009年03月

  研究課題番号:  19760198

• 自律分散型電気エネルギー流通監視システム

  基盤研究(A)

  研究期間:  2006年06月  -  2010年03月

  研究課題番号:  18206028

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