Patent ID: 7821802
Filing Date: 2010-10-26
Classification: H02M

Abstract:
1. A control method for a power converter, comprising the steps of: converting a first AC voltage directly into a second AC voltage of a desired magnitude and a desired frequency by turning bidirectional switches on and off without employing an energy buffer; providing output phase voltage command values; providing supply voltages; obtaining final output phase voltage command values by limiting peak values of the output phase voltage command values in accordance with magnitudes of the supply voltages; and controlling the power converter according to the final output voltage command values, wherein final modulation signals, which have been obtained by adding a correction signal to modulation signals generated from the output phase voltage command values whose maximum value and minimum value are limited, are used as control commands for the power converter, and the correction signal is set so that the final modulation signal for at least one phase of an output side of the power converter may become 1.0 or −1.0 per unit, relative to a maximum phase voltage of the supply.