Research on Soft Switching Optimization Control Strategy for ANPC Half-bridge DAB under Wide Voltage Range

In order to improve the operating efficiency of the ANPC half-bridge DAB, this paper proposes an optimized control strategy based on soft switching trajectory. First of all, by analyzing the ANPC half-bridge DAB device current to realize the control variable constraints of soft switching, and then determined the soft switching area of DAB in the PV. In order to achieve soft switching of the device in the wide voltage range and the full power range, a control variable adjustment trajectory is formulated, and a soft switching optimization control strategy containing mode selection is obtained. Simulation analysis shows that when the input voltage of the DAB is higher than the output voltage, the DAB device can achieve soft switching within the full power range. And when the input voltage of the DAB is lower than the output voltage and the transmission power of the DAB is higher, the device can also achieve soft switching. The simulation verifies the correctness of the theoretical analysis and the effectiveness of the proposed control strategy.