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首页> 外文期刊>Power Electronics, IET >Open-circuit fault diagnosis method for the T-type inverter based on analysis of the switched bridge voltage
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Open-circuit fault diagnosis method for the T-type inverter based on analysis of the switched bridge voltage

机译：基于开关电桥电压分析的t型逆变器开路故障诊断方法

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摘要

Multilevel inverter topologies have been widely used in applications of wide-power range. Therefore, fault diagnosis of such circuits is becoming more and more important. The T-type topology, which is one of many multilevel topologies, has an advantage in terms of efficiency compared to the neutral-point-clamped type. This study proposes a new diagnosis method of an open-circuit (OC) fault for a three-level T-type inverter (3LT(2)I). The proposed method is achieved by measuring the bridge voltage and its duration time. The bridge voltage includes information of switching states of 3LT(2)I but not affected by the load. First, according to polarity of the reference voltage and corresponding phase current, working period of the 3LT(2)I is divided into four working regions. Then, the bridge voltage is analysed in detail when an OC fault occurs in different working regions. At last, a fault diagnosis circuit is designed to achieve automatic diagnosis for the OC fault. Simulation and experimental results show that the proposed method can identify the faulty switch exactly and quickly.
机译：多电平逆变器拓扑已广泛用于宽功率范围的应用中。因此，这种电路的故障诊断变得越来越重要。与中性点钳位型相比，T型拓扑是许多多层拓扑之一，在效率方面具有优势。这项研究提出了一种新的三级T型逆变器（3LT（2）I）开路（OC）故障诊断方法。通过测量电桥电压及其持续时间可以实现所提出的方法。桥电压包括3LT（2）I的开关状态信息，但不受负载影响。首先，根据参考电压的极性和相应的相电流，将3LT（2）I的工作周期分为四个工作区域。然后，当在不同的工作区域中发生OC故障时，将详细分析电桥电压。最后，设计了故障诊断电路，以实现对OC故障的自动诊断。仿真和实验结果表明，该方法能够准确，快速地识别出故障开关。

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  • 来源
    《Power Electronics, IET》 |2019年第2期|295-302|共8页
  • 作者

    Chen Danjiang; Liu Yutian; Zhang Shaozhong;

  • 作者单位

    Zhejiang Wanli Univ, Fac Elect & Comp Sci, 8 South Qian Hu Rd, Ningbo, Zhejiang, Peoples R China;

    Zhejiang Wanli Univ, Fac Elect & Comp Sci, 8 South Qian Hu Rd, Ningbo, Zhejiang, Peoples R China;

    Zhejiang Wanli Univ, Fac Elect & Comp Sci, 8 South Qian Hu Rd, Ningbo, Zhejiang, Peoples R China;

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