THREE-PHASE POWER CONVERSION DEVICE

摘要

A three-phase power conversion device is provided with single-phase inverters (100a-100c) the alternating-current output terminals of which are respectively connected in series to respective phases of a three-phase alternating-current track, a control unit (200) for PWM-controlling each of the single-phase inverters (100a-100c) on the basis of a voltage command (V*), and an alternating-current voltage detection circuit (15) for detecting the phase and voltage amplitude of three-phase alternating-current voltage. The control unit (200) generates the voltage command (V*) by adding a zero-phase component (Vo) common to three phases to a basic command (Vx*) for each of the phases. The zero-phase component (Vo) is generated by applying an amplitude (a) calculated on the basis of the phase and voltage amplitude to a set reference zero-phase voltage (Voo) to reduce the peak of the voltage command (V*) for each of the single-phase inverters (100a-100c).