Patent ID: 8743571

Claim:
A distributed power supply system, comprising: an inverter circuit that converts a direct current power generated by a direct current power supply to an alternating current power, and that supplies the alternating current power to a power system having a three-phase alternating current power supply; a voltage detector that detects system voltage of the power system; and an inverter control circuit for carrying out a PWM control by the inverter circuit, wherein the inverter control circuit includes a three-phase voltage command signal generation unit that comprises: a three-phase fundamental wave command signal generation unit that generates three-phase fundamental wave command signals from two phase components of voltage detected by the voltage detector; and a third harmonic signal generation unit that adds together respective third harmonics of said three phase fundamental wave command signals each having a predetermined amplitude that are calculated based on said three-phase fundamental wave command signals to generate a third harmonic signal, wherein the three-phase voltage command signal generation unit adds said third harmonic signal to the three-phase fundamental wave command signals, respectively, thereby generating three-phase voltage command signals.