Patent ID: 7310253
Filing Date: 2007-12-18
Classification: H02M

Abstract:
1. A power conversion circuit control apparatus comprising: a power conversion circuit which is connected to an AC power system and a DC power supply circuit, and converts a DC voltage into an AC voltage; AC voltage detecting means for detecting an AC voltage of the AC power system; alternate current detecting means for detecting an alternate current; phase detecting means for detecting a reference phase from the detected value of the AC voltage; coordinate transforming means for detecting an active current component and a reactive current component from the detected value of the alternate current and the reference phase; current control means for controlling an alternate current of the power conversion circuit by adjusting a voltage command value in accordance with an active current component command, a reactive current component command, the active current component, and the reactive current component; polar coordinate transforming means for calculating an AC-voltage amplitude command value and an AC-voltage phase command value from an output from the current control means; AC voltage control means for controlling switching elements of the power conversion circuit in accordance with the AC-voltage amplitude command value, the AC-voltage phase command value, and the reference phase; voltage amplitude/phase detecting means for detecting a voltage amplitude and phase of each phase from the detected value of the AC voltage; and mean calculating means for detecting mean values of the voltage amplitudes and phases of individual phases, wherein the output from the current control means is corrected by the mean values of the voltage amplitudes and phases, and the AC-voltage amplitude command value and the AC-voltage phase command value are corrected by differences between the voltage amplitude and phase of each phase and the mean values of the voltage amplitudes and phases.