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针对牵引变流器中NPC型三电平逆变器在一相或两相桥臂发生复合故障后的容错控制问题,在给出三电平逆变器四桥臂容错拓扑及其控制方式的基础上,通过分析逆变器主桥臂冗余矢量容错能力,归纳出复合故障类型,并就不同类型故障提出相冗余与矢量冗余相结合的容错控制策略,最终通过仿真建模对复合故障容错控制策略进行验证。仿真结果表明,三电平逆变器两相桥臂同时发生故障时可实现自动容错,故障后系统仍可全额或降额持续运行,验证了所提控制策略的有效性。
Aiming at the fault-tolerant control problem of the NPC three-level inverter in a traction converter after a composite fault occurs in one or two-phase legs, the fault tolerant topology and the control method of the four-leg inverter in the three- Based on the analysis of the fault tolerant capacity of the inverter’s main-leg redundancy vector, the fault types of composite fault are summarized, and the fault-tolerant control strategies of phase redundancy and vector redundancy are proposed for different types of faults. Finally, Fault tolerant control strategy to verify. The simulation results show that the two-phase three-phase inverter can achieve automatic fault tolerance when the two-phase bridge faults simultaneously, and the system can still operate in full or derate after the fault, which verifies the effectiveness of the proposed control strategy.