A generation circuit is configured to generate an output voltage command value Vor* for an inverter based on a three-phase reference value Vr, a zero-phase reference value, a detected value of a current sensor, and a detected value of a voltage sensor. A compensation circuit is configured to compensate for a voltage drop in a three-phase AC line when three-phase AC power is supplied from the inverter to an AC load. A corrector is configured to correct the output voltage command value Vor* based on a compensation command value Vol. A control circuit is configured to control the inverter based on an output voltage command value Vo* corrected by the corrector.