A bidirectional AC-DC converter for charging piles with a backflow power optimization control strategy

Abstract This paper proposes a single-stage isolated converter with a backflow power optimization method for V2G charging piles. The modulation algorithm is optimized, and the phase shifts are designed to minimize the backflow power. Due to the suppression of backflow power during the switching period, the power factor correction (PFC) is realized within the line frequency. Meanwhile, the transformer RMS current is decreased under both the V2G and G2V modes, which improves the efficiency of the converter. To verify the proposed strategy, simulations are carried out in PLECS and validate the effectiveness of the proposed bidirectional converter.