| 摘要 |
PROBLEM TO BE SOLVED: To avoid a counter power flow caused by a sudden load fluctuation while a private generator and a commercial power supply are in operation in parallel with each other without giving large burdens upon a generator and an engine. SOLUTION: In a counter power flow preventive device, the decline of a received power to a value lower than a lowest receiving power set value is detected by a receiving power converter 30, before a counter power flow against a commercial power supply 35 is produced by a power generated by a private generator 22 when a plant load 20 is suddenly reduced. If the decline of the received power continues for a time longer than a high speed control start set time, a governer controller 25 turns a changeover switch 25a to a high speed control calculator 27 side, and controls the fuel supply rate of an engine governer 24 to be limited so as to have the output power generated by the private generator 22 reduced by a predetermined generation value. If the received power is recovered by the decline of the output power of the private generator 22, the control of the fuel supply rate of the engine governer 24 is returned to the normal speed control by a speed control calculator 26. |
