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Fault Diagnosis and Fault-tolerant Operation of Current Source Inverter for Safety-Critical Applications

机译：安全关键应用电流源逆变器的故障诊断和容错操作

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摘要

This paper presents the fault-tolerant current source inverter based motor-drive system, which can diagnose the open-circuit failure of the switches and restructure the topology of the inverter to keep the inverter operating in the post-fault condition. The proposed diagnostic method is able to detect the open-circuit fault both in the main switches and those of the redundant switches. During fault-tolerant operation, the identified faulty switch is fully replaced by one of the switches from the fourth leg to ensure full rating operation of the inverter without any extra overrating requirements for switches. In addition, wide bandgap (WBG) devices are employed to conFigure the redundant fourth leg. During normal operation, soft switching is enabled across all the silicon IGBTs, while just WBG devices in the fourth leg undertake hard switching. Thus, the inverter efficiency is improved and the thermal stress in the IGBTs is relieved.
机译：本文提出了一种基于容错电流源逆变器的电动机驱动系统，该系统可以诊断开关的开路故障并重构逆变器的拓扑结构，以使逆变器在故障后的状态下仍能正常工作。所提出的诊断方法能够检测主开关和冗余开关中的开路故障。在容错操作过程中，已识别的故障开关完全由第四分支中的一个开关取代，以确保逆变器完全额定运行，而对开关没有任何额外的过额定要求。另外，采用宽带隙（WBG）设备来配置冗余第四分支。在正常操作期间，将在所有硅IGBT上启用软开关，而第四步中只有WBG器件会进行硬开关。因此，提高了逆变器效率并且减轻了IGBT中的热应力。

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