Patent ID: 8503206

Claim:
A three-phase voltage source DC-AC power converter comprising: a three-phase voltage source DC-AC power converting circuit that converts power from a DC voltage source into three-phase AC power according to a pulse width of gate signals that are generated based on a PWM scheme, and outputs the three-phase AC power from an AC terminal; target current, producing means that includes a filter voltage vector command device and a voltage controller, the filter voltage vector command device generating a filter voltage command vector that becomes a reference of the three-phase AC power output from the AC terminal, the three-phase AC output voltage at the AC terminal being input as an input signal to the voltage controller, the voltage controller including an integrator which integrates a difference between the filter voltage command vector from the filter voltage vector command device and the three-phase AC output voltage at the AC terminal and specifies an internal equivalent impedance of the three-phase voltage source. DC-AC power converting circuit, the target current producing means outputting a PWM command such that a DC component included in the three-phase AC output voltage at the AC terminal becomes zero; and an M conversion circuit that converts the input signal input to the target current producing means into a signal on an αβ coordinate space having an α-axis and a β-axis, the α-axis and the β-axis being orthogonal to each other based on one of three phases, the M conversion circuit inputting the signal on the αβ coordinate space to the target current producing means.