Patent ID: 7710747

Claim:
A voltage-source inverter apparatus comprising: a rectifying circuit that rectifies a three-phase AC voltage of an AC input power supply; a voltage command generating unit that generates a voltage command signal having a frequency set by a frequency setting unit; and an inverter circuit that converts a DC voltage rectified by the rectifying circuit into a three-phase AC output voltage having predetermined frequency and amplitude, which is subjected to pulse width modulation (PWM) control, on the basis of the output voltage command signal generated by the voltage command generating unit, wherein the inverter apparatus is a voltage-source inverter, and wherein the voltage command generating unit is provided with a voltage synchronizing unit that synchronizes the output voltage command signal generated by the voltage command generating unit with a ripple voltage generated by a DC intermediate circuit provided between the rectifying circuit and the inverter circuit to synchronize the three-phase AC output voltage of the inverter with the ripple voltage generated by the DC intermediate circuit.