| 摘要 |
PURPOSE:To stop reverse electric power from an inverter to a commerical AC power source by detecting and comparing reactive power supplied by the inverter and reactive power which is consumed by a load with each other. CONSTITUTION:A device consists of a solar battery 1, the inverter 2, a system linkage reactor 4, the commercial power source 3, the load 5, a phase converter 6, converter transformers 7 and 13, an active power detector 8, a phase control circuit 10, reactive power detectors 9 and 14, a voltage control circuit 12, and an inverter driving circuit 11. The phase control circuit 10 inputs the output P of the detector 8 and sends a command to the inverter driving circuit 11 on the basis of the input value so that the output of the solar battery 1 is invariably maximum. The voltage control circuit 12 inputs the outputs Q and Q' of the detectors 9 and 14 and sends a command to the inverter driving circuit 11 so that Q does not exceeds Q'. A power failure of the commercial power source is detected from the certain-time continuation of Q>=Q' and the inverter 2 and commercial power source 3 are paralleled off in this case.
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