PROBLEM TO BE SOLVED: To suppress a voltage flicker caused by a load and a harmonic filter in a load system provided with the harmonic filter.SOLUTION: A harmonic suppression control circuit 1a is mounted in a harmonic suppression device 10a, and receives a detection signal from a current transformer 27 and a voltage transformer 27. The harmonic suppression control circuit 1a comprises: a HPF unit 3 for extracting a harmonic component of a load system 24; a gain adjustment unit 4 for calculating a first current command value iby multiplying the voltage extracted from the HPF unit 3 by a gain K and outputting the calculated command value; a current command arithmetic unit 5 for calculating, on the basis of detection signals of a load voltage VT and a load current iof the load system 24, a second current command value ifor compensating for a fluctuation component of reactive power arising from a load 25 and outputting the calculated command value; and a converter control unit 2a for calculating a compensation current value iby adding the first current command value iand the second current command value iand controlling the current of a self-excited converter 11 on the basis of the compensation current value i.
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