Efficiency Optimization of Three-Phase DAB Converter Based on APWM Cascade SPS Control

In order to expand the soft-switching range of three-phase DAB under light load and improve the conversion efficiency, This paper analyzes the working principle and soft-switching characteristics of three-phase DAB, and then derives its power expression and soft-switching operating range. Based on theoretical analysis results, an APWM cascade SPS optimization control strategy for expanding the soft-switching operating range is proposed. Finally, The simulation results on the Matlab/Simulink platform show that the proposed control strategy can achieve full-range soft-switching under different load power conditions, and effectively reduce the loss and improve the efficiency.