Partial Power Rated Ripple Power Compensation Strategies for $1-\phi$ Bidirectional AC-DC Matrix Converters

Compensation of ripple power required during the $\mathbf{1}-\phi$ operation of direct matrix converters needs to be addressed in order to improve their power density, reliability, cost effectiveness, etc. Literature survey reveals that compensation strategies relevant to matrix converters are usually implemented either at the low frequency AC side of the matrix converter or at the DC port side. In such cases, the entire ripple power needs to be handled by the compensation block, thereby effecting metrics such as voltage or current stresses, losses, power density, etc. In view of this, two circuits are described in this paper that perform active ripple power compensation of direct matrix converter based isolated bidirectional AC-DC converters while handling a fraction of the actual ripple power. The compensation circuits are operated at the high frequency link of the AC-DC converter on the DC port side. Relevant explanation of the working principle of the topologies are given, and simulation results for a 3.45 $\mathbf{kW}$ electric vehicle charger, with a 230 V (RMS) AC grid input, feeding a 400 V battery are presented to illustrate the findings.