SOLD POWER/PURCHASED POWER ZERO CONTROL POWER RECEIVING/GENERATING SYSTEM AND METHOD IN INTERCONNECTION SYSTEM WITH REVERSE POWER FLOW

摘要

PROBLEM TO BE SOLVED: To attain effect of energy saving, economy, and safety in a power supply system, having "reverse power flow" function.;SOLUTION: The power supply system comprises a first switch for turning the commercial power supply line to a load on/off, a second switch for turning the output line from a generator to the load on/off, a means of measuring consumed electric power and a single operation detector. The generator is brought into operating state, when a first set value of consumed electric power is measured; AC voltage, frequency and phase are synchronized between the commercial power supply line and the generator output line, the second switch is turned on, when they are synchronized; and then received power/purchased power zero control is performed thus bringing received power and purchased power of the commercial power supply to zero. Interruption of commercial power supply is detected by the single operation detector, and the first switch is turned off, and uninterruptible power supply from the generator is set.;COPYRIGHT: (C)2005,JPO&NCIPI