Boost Mode Analysis and ZVS-Guaranteed Control Strategy for Frozen Leg Operation of Three-Phase Dual Active Bridge Converters

The frozen leg method is an effective fault-tolerant approach for addressing open-circuit faults in three-phase dual active-bridge converters, requiring no additional hardware. This method isolates the faulty leg by disabling its two switches so that the converter can continue operating at reduced power levels. Prior literature on the frozen leg method primarily focuses on cases with unity voltage gain or buck mode. However, in boost mode where …