| 摘要 |
During the normal operation of a commercial power supply, a quick current limiting/interrupting part (3) supplies power from the commercial power supply to a load via a DC reactor, while an auxiliary power supplying part (4) performs a PQ control in such a manner that both the active and reactive powers to be supplied to the load (9) are zero. Additionally, the responsiveness of the PQ control is set to be longer than the accident detection period of the commercial power supply in an accident detecting part (2), thereby causing the auxiliary power supplying part (4) to supply power to the load (9) and an accident point without any instantaneous interruption until the accident detecting part (2) detects the accident. Moreover, the impedance of the DC reactor (14) is set to be equal to or greater than (100Z)/A, thereby inhibiting the voltage of the load (9) from being below an allowable voltage drop rate during the accident. If any power supply accident is detected by the accident detecting part (2), then the PQ control by the auxiliary power supplying part (4) is halted, and the interruptions by quick switches (13a,13b) are done.
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