Device for suppressing voltage fluctuation and higher harmonics.

摘要

A device for suppressing voltage fluctuation and higher harmonics of a power source system which supplies power to a load with large power fluctuation and large harmonic current. The device includes a self-commutated converter arranged in parallel with the load and a control circuit for controlling the self-commutated converter. The control circuit includes a compensation current variable calculation circuit for calculating a plurality of compensation current variables based on electrical quantities of the power source system and the load, a compensation gain calculation circuit for determining at least one compensation gain based on at least one of the compensation current variable, and a current instruction value calculation circuit for calculating a plurality of respective current instruction values based on the compensation gain and a plurality of the respective current compensation variables. The control circuit also includes an overall current instruction value calculation circuit for calculating an overall current instruction value by combining the current instruction values, and a current control circuit for controlling an output current of the self-commutated converter based on the overall current instruction value. <IMAGE>