POWER GENERATION SYSTEM, CONTROL METHOD, AND PROGRAM

To prevent overcharge of a storage battery during an autonomous operation of a distributed power system comprising a power generation mechanism and a power storage mechanism.SOLUTION: A power converter comprises: a control unit; a first power conversion unit that converts a voltage of DC power generated by a power generation device on the basis of a control command related to maximum power point follow-up control from the control unit and supplies the voltage to a power bus; and a second power conversion unit that is connected with the power bus, converts the voltage of the DC power supplied to the power bus on the basis of a charge-discharge control command related to charge-discharge control from the control unit and charges a storage battery, or converts the voltage of the DC power discharged from the storage battery and supplies the voltage to the power bus. When an amount of power generated by the power generation device exceeds an amount of load power consumed by a load and a state of charge of the storage battery satisfies a predetermined condition during an autonomous operation, the control unit controls the first power conversion unit and the second power conversion unit to supply, to the power bus, the DC power obtained through discharge of storage power charged in the power storage battery preferentially over the DC power generated by the power generation device.SELECTED DRAWING: Figure 6 【課題】発電機構と蓄電機構とを備える分散型電源システムの自立運転時における蓄電池の過充電を防止する。【解決手段】電力変換器は、制御部と、制御部からの最大電力点追従制御に関する制御指令に基づいて発電装置で発電された直流電力の電圧を変換して電力バスに供給する第１電力変換部と、電力バスに接続され、制御部からの充放電制御に関する充放電制御指令に基づいて電力バスに供給された直流電力の電圧を変換して蓄電池に充電し、または、蓄電池から放電された直流電力の電圧を変換して電力バスに供給する第２電力変換部と、を備え、制御部は、自立運転の際に、発電装置の発電電力量が負荷で消費される負荷電力量を超え、蓄電池の充電状態が所定条件を満たすときには、蓄電池に充電された蓄電電力の放電による直流電力を、発電装置で発電された直流電力に優先させて電力バスに供給するように第１電力変換部および第２電力変換部を制御する。【選択図】図６