Patent ID: 8547713
Filing Date: 2013-10-01
Classification: H02M

Abstract:
1. A power conversion system comprising: a first power converter for converting AC to DC; a second power converter for converting the DC converted by the first power converter to AC having any frequency; a current detecting means for detecting a current of the second power converter; pulsation detecting means including effective power calculating means for calculating effective power based on an output of a voltage control means controlling the second power converter and based on the current detected by the current detecting means, the pulsation detecting means also including means for band-pass filtering the effective power to detect a rectification ripple frequency of the first power converter; voltage correcting means for outputting a correction amount of a voltage to be output to the second power converter on the basis of the rectification ripple frequency obtained from the pulsation detecting means; and the voltage control means for outputting a voltage instruction to be output to the second power converter on the basis of the correction amount obtained from the voltage correcting means.