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首页> 外文期刊>IEEE Transactions on Power Electronics >A Redundant Unit to Form T-Type Three-Level Inverters Tolerant of IGBT Open-Circuit Faults in Multiple Legs
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A Redundant Unit to Form T-Type Three-Level Inverters Tolerant of IGBT Open-Circuit Faults in Multiple Legs

机译：冗余单元，以形成可容忍多支路IGBT开路故障的T型三电平逆变器

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摘要

T-type multilevel (T2ML) inverters feature low total harmonic distortion and high efficiency. Reliability improvement is particularly important for T2ML inverters because they have high power device count. Methods that provide T2ML inverters with the ability to tolerate simultaneous failures of multiple switches in several legs have not been addressed in the existing literature. This paper proposes a redundant unit that can be shared across phases in a T-type three-level inverter topology to manage open-circuit faults in multiple legs. The redundant unit includes two switches and six diodes, with the extra active switches connected by diodes to each middle switch of the base inverter. Under fault conditions, a standby parallel leg consisting of middle switches and the added redundant devices can be formed in each phase of the inverter to provide an extra current path connecting the dc bus and loads. The middle switches can share the redundant unit simultaneously to replace faulted half-bridge switches. By these means, open-circuit faults in multiple legs can be tolerated simultaneously and the rated output capacity can be maintained during faulted operation. Experimental tests are given to verify the effectiveness and feasibility of this proposed fault-tolerant method.
机译：T型多电平（T​​2ML）逆变器具有较低的总谐波失真和高效率。可靠性的提高对于T2ML逆变器尤为重要，因为它们具有大量的功率器件。现有文献中尚未解决使T2ML逆变器能够承受多个分支中的多个开关的同时故障的方法。本文提出了一种冗余单元，该单元可以在T型三电平逆变器拓扑中的各相之间共享，以管理多个分支中的开路故障。冗余单元包括两个开关和六个二极管，多余的有源开关通过二极管连接到基础逆变器的每个中间开关。在故障情况下，可以在逆变器的每一相中形成一个由中间开关和附加冗余设备组成的备用并联支路，以提供连接直流母线和负载的额外电流路径。中间的交换机可以同时共享冗余单元，以替换出现故障的半桥交换机。通过这些方法，可以同时容忍多条支路出现开路故障，并且在故障操作期间可以保持额定输出容量。给出了实验测试，以验证该提议的容错方法的有效性和可行性。

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