Fault-Tolerant Multi-Parallel Three-Phase Two-Level Converters with Adaptive Hardware Reconfiguration

This letter proposes a fault-tolerant multi-parallel converter with adaptive hardware reconfiguration. The proposed topology maximizes open-switches fault tolerance with minimal hardware redundancy, efficiently covering a broad spectrum of potential fault scenarios. Another pivotal feature of the proposed topology is its adaptive hardware reconfiguration capability in the event of an insulated gate bipolar transistor failure (IGBT). Significantly, this adaptability is achieved without additional control circuits, simplifying the overall control complexity. The proposed topology achieves a more harmonic balance with minimal hardware redundancy, maximal fault coverage, and minimum control complexities. Finally, the prototype of the proposed fault-tolerant topology has been constructed. This prototype and the proposed post-fault control strategies have been thoroughly validated through experimental investigations, demonstrating their effectiveness and resilience.