Control Strategy of Working Mode Optimization for Three-Phase Single-Stage Isolated AC-DC Converter

This paper proposes a control strategy of working mode optimization for a three-phase single-stage isolated AC-DC converter based on the dual active bridge (DAB). The optimum working mode is analyzed and implemented. The current vectors are decomposed by space vector modulation, and the two current vectors are respectively controlled in adjacent switching cycles. The two vectors are implemented by the optimum working modes. The operating mode of the circuit changes with the amplitude of the input voltage and the output load, and ensure to realize unit power factor. Finally, the feasibility and correctness of the control strategy are verified by the experimental results.