DISTRIBUTED POWER SUPPLY SYSTEM

To level the life of a power conditioner, while preventing reverse flow power in a distributed power supply system.SOLUTION: A distributed power supply system comprises: a power generator (20); a plurality of power conditioners (10) that are connected such that they can perform master-slave type communication; detection means (6a, 6b) that detect an output power; and system power measuring means (7) that includes input means for inputting the detected output power to the power conditioners and is independent of the plurality of power conditioners. A master machine includes a control unit (12) that, when the maximum value of the output power in a past predetermined period is smaller than a threshold at which a reverse flow to a commercial power system (1a) can occur, performs load follow-up control of causing output changing means (13) to increase the output power by a predetermined amount. A slave machine includes a control unit that supplies a power to a load in accordance with the output power in the past predetermined period transmitted from the master machine and information on the load follow-up control.SELECTED DRAWING: Figure 3 【課題】分散型電源システムにおける逆潮流電力を防止しつつ、パワーコンディショナの寿命を平準化する。【解決手段】発電装置（２０）と、マスタ・スレーブ方式の通信が可能に接続された複数のパワーコンディショナ（１０）と、出力電力を検知する検知手段（６ａ、６ｂ）と、検出された出力電力をパワーコンディショナに入力する入力手段とを含み、複数のパワーコンディショナとは独立する系統電力計測手段（７）とを備え、マスタ機は、過去の所定期間における出力電力の最大値が、商用電力系統（１ａ）への逆潮流が生じ得る閾値より小さい場合には、出力変更手段（１３）に出力電力を所定量だけ増加させる負荷追従制御を行う制御部（１２）を備え、スレーブ機は、マスタ機から送信された過去の所定期間における出力電力と、負荷追従制御に関する情報とにしたがって負荷に電力を供給する制御部を備える。【選択図】図３