Control method for single-phase voltage-type AC-DC conversion circuit and single-phase voltage-type AC-DC converter

摘要

PROBLEM TO BE SOLVED: To provide a single-phase voltage type AC-DC converter enabling an autonomous parallel operation having each device autonomously controlling output deviations when a plurality of machines are connected in parallel and parallel running is conducted on single-phase AC.;SOLUTION: A single-phase AC having a predetermined phase difference with the phase of the single-phase AC output voltage of an AC terminal is generated, and PWM control over an inverter is conducted by using the generated single-phase AC and the single-phase AC output voltage of the AC terminal. 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 a time when the three-phase AC is M-converted. The single-phase AC having the predetermined phase difference is used as a second axis corresponding to a β-axis component when the three-phase AC is M-converted. The single-phase voltage type AC-DC converter independently controls the first axis and the second axis, and makes the single-phase AC output voltage follow the frequency of a power system by using a specific electrical angle generated by a frequency control circuit.;COPYRIGHT: (C)2009,JPO&INPIT