Patent ID: 6812592
Filing Date: 2004-11-02
Classification: H02J,H02M,Y02E

Abstract:
A voltage fluctuation compensating apparatus for suppressing fluctuation of a voltage supplied to a load, comprising:a detection/control portion for detecting a voltage dip in a power system, and controlling power feeding in accordance with detection of a voltage dip; and a plurality of voltage compensating circuits connected to the power system in series, each of the voltage compensating circuits including a plurality of energy storage units respectively having charging voltages different from one another, the voltage compensating circuits converting DC voltages of the respective energy storage units into AC voltages and outputting the AC voltages, wherein the charging voltages of the energy storage units in the voltage compensating circuits are used as bit signals for a reference value to check a voltage dip amount of the power system with the reference value and to convert the voltage dip amount into a binary signal, and a combination of the voltage compensating circuits is selected from the plurality of voltage compensating circuits in accordance with the binary signal so that a sum of output voltages of the voltage compensating circuits selected compensates for the voltage dip of the power system.