| 摘要 |
PURPOSE:To obtain an unbalance compensator capable of suppressing harmonic current by comprising a converter control circuit which controls a both power converter on the basis of command signals from a power interchange control circuit, a reactive power compensation circuit, and a harmonic circuit. CONSTITUTION:A power converter 10 communicates power in both directions between AC power of an M connection power source circuit on the secondary side of a Scott connection transformer 2 and DC power of a DC intermediate circuit, and a power converter 11 between AC power of a T connection power source circuit and DC power of the DC intermediate circuit. A power interchange control circuit 15, a DC voltage control circuit 16, a reactive power compensation circuit 17, and a harmonic compensation circuit 18 output command signals complying with control targets, which are synthesized in a batch by a current command operational circuit 19, so that the power converters 10,11 undergo on-off switching control through a current control circuit 20 and a PWM control circuit 21 on the basis of the command signal. As a result, two-phase side active power becomes equal, and simultaneously reactive power and harmonic current are compensated to provide a complete equalization of current. |
