| 摘要 |
PROBLEM TO BE SOLVED: To obtain a distributed power supply system enabling system interconnection with a single-phase three-wire commercial power system capable of supplying its own load with exclusive power even at the time of linkage or even at the time of self-support. SOLUTION: Contacts 5a for a first relay are fitted between an output from an inverter 4 and a single-phase three-wire commercial power system 1, an exclusive single-phase AC output terminal 6 is mounted between a neutral conductor N among the contacts 5a and the inverter 4 and one voltage line V, and both voltage lines V, U among the output terminal 6, the inverter 4 and the contacts 5a are connected through contacts 7a for a second relay. The contacts 5a are closed, the contacts 7a are opened, and the inverter 4 is operated synchronously with the commercial power system 1 at the normal time of the commercial power system 1, and the contacts 5a are opened, the contacts 7a are closed, and the inverter 4 is operated so that voltage between both voltage lines V, U reaches the single-phase AC voltage between the neutral conductor of the commercial power system 1 and either voltage line at the time of the service interruption of the commercial power system 1. |
