| 摘要 |
PROBLEM TO BE SOLVED: To realize a parallel synchronous operations of respective distributed power supply devices, when the respective distributed power supply devices are paralleled off from a power system into self-contained operations, while synchronism is not obtained by exchanging information on output powers, output currents, etc., between the distributed power supply devices. SOLUTION: When a plurality of distributed power supply devices (solar generators 1) which are paralleled off from a power system 5 are put into self-contained operations, an inverter 3 of one of the respective distributed power supply devices is used as a reference inverter. The reference inverter is operated by a voltage control operation to form an AC voltage source. After the reference inverter generates a voltage, the inverters 3 of the remaining distributed power supply devices are operated by current control operation synchronously with the output voltage of the reference inverter. Through the current control operation, AC-current sources synchronous with the AC voltage source are respectively formed, and the parallel synchronous operations of the respective distributed power supply devices are realized. |
