| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To enable compactly and inexpensively obtaining reactive power of a load without increasing a circuit scale. <P>SOLUTION: In a reactive power compensator interlocked with a power system and controlling voltage fluctuation of the power system, in order to compensate the reactive power of the load, a multiplier 24 obtains an active power instantaneous value p by multiplying a voltage v1 of the system voltage by a load current if, a multiplier 15 obtains a reactive power instantaneous value q by multiplying a voltage v2 delayed by 90°from the system voltage by the load current if, and an adder 17 adds the difference between a differential value obtained by averaging the active power instantaneous value p for a predetermined period and a differential value obtained by averaging the reactive power instantaneous value q for a predetermined period to the reactive power instantaneous value q, thereby obtaining a reactive power quantity Q. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
