Three-level combined fault-tolerant inversion circuit

The invention discloses a three-level combined fault-tolerant inversion circuit. The three-level combined fault-tolerant inversion circuit comprises a three-phase bridge arm fault-tolerant module anda transformer fault-tolerant module. A three-phase output voltage waveform is optimized by a transformer during normal working of the inversion circuit, a fault bridge arm is removed after a fault, single-arm, dual-arm and three-arm fault tolerance can be achieved by a part of structure of the bridge arm, a two-phase voltage can be synthesized to a three phase to be output by the transformer, single-phase fault tolerance is achieved, and normal working of the circuit is ensured. The three-phase level inversion circuit fault-tolerant topology has a favorable fault-tolerant function, is simple to control and easy to implement and is simple in topological structure. 公开种三电平组合容错逆变电路，包括三相桥臂容错模块和变压器容错模块。利用变压器在逆变电路正常工作时对三相输出电压波形进行优化；故障后，将故障桥臂切除，可利用桥臂部分结构实现单臂、双臂、以及三臂故障容错；可利用变压器将两相电压合成三相进行输出，实现单相容错保证电路正常工作。三相电平逆变电路容错拓扑具有良好的