SINGLE-PHASE VOLTAGE TYPE AC-DC CONVERSION DEVICE

PROBLEM TO BE SOLVED: To provide a single-phase voltage type AC-DC conversion device that enables such an autonomous parallel operation that an individual device autonomously controls an output deviation in the case that a plurality of devices are connected in parallel to perform a parallel operation by a single-phase AC.SOLUTION: A single-phase AC having a predetermined phase difference from a phase of a single-phase AC output voltage of an AC terminal is generated, and the generated single-phase AC and the single-phase AC output voltage of the AC terminal are utilized to perform PWM control of an inverter. That is, the single-phase AC output voltage of the AC terminal is used as a first axis corresponding to an α-axis component at the time when a three-phase AC is M-converted. The single-phase AC having the predetermined phase difference is used as a second axis corresponding to a -axis component at the time when the three-phase AC is M-converted. A single-phase voltage type AC-DC conversion device independently controls the first axis and the second axis to make the single-phase AC output voltage follow a frequency of a power system by utilizing a unique electric angle generated by a frequency control circuit.