Patent ID: 7696730
Filing Date: 2010-04-13
Classification: H02M

Abstract:
1. A control apparatus for an AC-AC direct converter in which a multiphase AC voltage is directly converted into a multiphase AC voltage having a desired amplitude and frequency by turning semiconductor switching elements ON/OFF in response to at least voltage commands outputted from the control apparatus, comprising: a first means for calculating a phase command value of an output voltage of the converter; a second means for calculating at least one of two current components of two orthogonal axes by using output currents of the converter and the phase command value calculated by the first means; a third means for detecting a pulsation component contained in the at least one of two current components; a fourth means for calculating a phase correction magnitude by using the pulsation component so as to decrease the pulsation component; fifth means for correcting the phase command value by using the phase correction magnitude to provide a corrected phase command value; and a rotating coordinate transformation means that outputs the voltage commands, the rotating coordinate transformation means receiving the corrected phase command value.