A single phase AC-DC bidirectional converter with integrated ripple steering

Abstract

Charging or discharging of batteries connected to the grid usually requires bulky capacitors on the battery side to filter out the large double grid frequency current ripple. This paper proposes a novel single phase ac-dc bidirectional (BD) converter that improves the utilization of the filtering capacitor by actively steering the ripple into it and thereby cycling it through a large portion of its operating voltage range. This greatly reduces the overall capacitance required to filter the double grid frequency current ripple and results in a low cost solution with high power density.