Computation of Locational and Hourly Maximum Output of a Distributed Generator Connected to a Distribution Feeder

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  • Hayashi Yasuhiro
    Graduate School of Electrical and Electronics engineering, University of Fukui
  • Matsuki Junya
    Graduate School of Electrical and Electronics engineering, University of Fukui
  • Hanai Yuji
    Graduate School of Electrical and Electronics engineering, University of Fukui
  • Hosokawa Shinpei
    Graduate School of Electrical and Electronics engineering, University of Fukui
  • Kobayashi Naoki
    Distribution Engineering Group, Distribution Department, Power Network Division, Tokyo Electric Power Company

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Other Title
  • 分散型電源の地点別時間別連系可能最大出力の算定
  • ブンサンガタ デンゲン ノ チテン ベツ ジカン ベツレンケイ カノウ サイダイ シュツリョク ノ サンテイ

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Recently, the total number of distributed generation such as photovoltaic generation system and wind turbine generation system connected to distribution network is drastically increased. Distributed generation utilizing renewable energy can reduce the distribution loss and emission of CO2. However the distribution network with the distributed generators must be operated keeping reliability of power supply and power quality. In this paper, the authors propose a computation method to determine the maximum output of a distributed generator under the operational constrains ((1) voltage limit, (2) line current capacity, and (3) no reverse flow to bank) at arbitrary connection point and hourly period. In the proposed method, three-phase iterative load flow calculation is applied to evaluate the above operational constraints. Three-phase iterative load flow calculation has two simple procedures: (Procedure1) addition of load currents from terminal node of feeder to root one, and (Procedure2) subtraction of voltage drop from root node of feeder to terminal one. In order to check the validity of the proposed method, numerical simulations are accomplished for a distribution system model. Furthermore, characteristics of locational and hourly maximum output of distributed generator connected to distribution feeder are analyzed by several numerical examples.

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