Enhanced Fault-Tolerant Triple Active Bridge Converter for DC Microgrid

The development of DC microgrids has accelerated due to their excellent compatibility with DC sources and loads. In these systems, the Triple Active Bridge (TAB) converters have emerged as key components, establishing a versatile three-port network that integrates distributed energy resources (DERs), battery energy storage systems (BESS), and loads. Given the susceptibility of these systems to disturbances and failures, ensuring fault-tolerant operation is essential. This paper proposes an enhanced TAB converter design with enhanced fault-tolerant capabilities, achieved through the addition of only two IGBTs and one diode to the conventional topology. Furthermore, a novel control strategy is presented for the proposed TAB, enabling seamless transition to Buck/Boost mode during short-circuit faults and rapid mitigation of open-circuit faults in switches, thereby ensuring continuous operation. The effectiveness of the proposed topology and control strategy is validated through simulation.