Service Restoration Method Considering Simultaneous Disconnection of Distributed Generators by One Bank Fault of Distribution System

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  • Takano Hirotaka
    Dept. of Electrical and Electronics Engineering, University of Fukui
  • Hayashi Yasuhiro
    Dept. of Electrical and Electronics Engineering, University of Fukui
  • Matsuki Junya
    Dept. of Electrical and Electronics Engineering, University of Fukui
  • Kobayashi Naoki
    Distribution Engineering, Distribution Department, Tokyo Electric Power Company

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Other Title
  • 配電系統のバンク事故による分散型電源の一斉解列を考慮した事故復旧手法
  • ハイデン ケイトウ ノ バンク ジコ ニ ヨル ブンサンガタ デンゲン ノ イッセイカイレツ オ コウリョ シタ ジコ フッキュウ シュホウ

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Abstract

Distributed generators (DGs) such as fuel cells and solar cells etc. are going to be installed in demand side of distribution systems. The distributed generators can reduce distribution loss by appropriate allocation. However, there are several problems to install DGs such as service restoration of distribution system with DGs and so on. When one bank fault of distribution substation occurs in distribution system, since DGs are simultaneously disconnected from the system, it is not easy to restore isolated load by one bank switching in distribution substation. Therefore, a service restoration method to determine restoration configuration and restoration procedures (switching procedure from normal configuration to restoration configuration) taking into account simultaneous disconnection of DGs is needed. In this paper, the authors propose a computation method to determine the optimal restoration configuration and the restoration procedure considering simultaneous disconnection of DGs by one bank fault of distribution system. In the proposed algorithm, after all of restoration configuration candidates are effectively enumerated under the operational constraints, the optimal configuration to restore the isolated load is selected among enumerated configuration candidates. After determining the optimal restoration configuration, the optimal restoration procedures are obtained by greedy algorithm. Numerical simulations are carried out for a real scale system model with 237 sectionalizing switches (configuration candidates are 2237) and 21DGs (total output is 5250kW which is 3% of total load) in order to examine the validity of the proposed algorithm.

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