Patent ID: 6154379
Filing Date: 2000-11-28
Classification: H02M

Abstract:
An electric power conversion device connected between a direct current power system and an alternating current power system for transferring electric power between the direct current power system and the alternating current power system, said device comprising:an alternating current section connected to said alternating current power system;a direct current section connected to said direct current power system;a switching section which is connected between said direct current section and said alternating current section and performs power conversion by switching operation; anda control section for controlling said switching section;wherein said direct current section is provided with a ripple detection means for detecting a ripple component emerging in a direct current side and for generating a ripple detection signal; andsaid control section receives said ripple detection signal from said ripple detection means, generates a direct current component compensation signal for controlling a direct current component included in a current of said alternating current section based on said ripple detection signal, and controls said switching section by a control signal including said direct current component compensation signal to compensate the direct current component included in said alternating current section.