| 摘要 |
<P>PROBLEM TO BE SOLVED: To surely restrain harmonic current even if a reactor exists between a high speed switch and a load, and load voltage is distorted by the harmonic current flowing into the reactor, in an active filter function device such as an instantaneous-drop compensation device having the active filter function. <P>SOLUTION: In order to restrain the harmonic current caused by the load 3, a control unit 10 outputs a command S for controlling the operation of a power converter 4 so as to output a compensation current from the power converter 4. The command S is made to include a deviation command according to a difference between a harmonic compensation command for compensating the harmonic components of the load current and an inverter output current, and include not only a reference voltage command indicating the reference voltage but also a deviation voltage command according to a difference between a reference voltage and the load voltage. Since the deviation voltage command is included in the command S, even if the load voltage is distorted, the compensation current, taking into consideration of the distortion of the load voltage, is output, to surely cancel the harmonic current caused by the load. <P>COPYRIGHT: (C)2009,JPO&INPIT |
