Fault-Tolerant Control Strategy for Half Bridge ANPC based DAB Converter with Enhancing Reliability

Dual active bridge (DAB) DC/DC converters are commonly used in a range of applications because they offer several benefits, including as effective electrical isolation, high power density, and the ability to transfer power in both directions. However, the increasing demand for high voltage levels and large power capacities necessitates the adoption of multilevel circuits to enhance DAB performance while reducing complexity. This paper focuses on the 3/2 level single-phase DAB converter with half bridge ANPC, proposing a novel fault-tolerant control strategy tailored to this configuration. The approach incorporates redundant module implementation and modified switching patterns to maintain three-level voltage at the primary side, ensuring maximum power flow even in the presence of faults. Validation through real time simulations confirms the efficacy of the proposed strategy under real-world conditions.