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Open-circuit Fault Diagnosis Method for Four-wire T-type Three Level Rectifier

机译:四线T型三电平整流器开路故障诊断方法

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Four-wire T-type three level rectifier (four-wire 3LT2R) as a kind of multilevel rectifier topologies has different operation states and modulation strategies, compared with three-wire systems and two-level topologies. Therefore, the fault diagnosis algorithms for the latter cannot be directly applied to the former. In this paper, an open-circuit fault diagnosis method for the four-wire 3LT2R systems is presented. By analyzing the operation situation of the system under different switching states and the currents in different directions, the abnormal condition of dc-link capacitive voltages in the case of an open circuit fault of a switch element is explained. Except the voltage imbalance between the upper and lower capacitors and the grid voltage angle, an open-circuit fault diagnosis method doesn’t use other features. Simulation results verified the robustness and the effectiveness of the proposed fault detection method.
机译:四线制T型三电平整流器(四线制3LT 2 R)作为一种多级整流器拓扑,与三线系统和两级拓扑相比,具有不同的工作状态和调制策略。因此,后者的故障诊断算法不能直接应用于前者。本文针对四线制3LT的开路故障诊断方法 2 介绍了R系统。通过分析系统在不同的开关状态和不同方向的电流下的运行情况,解释了在开关元件开路故障的情况下直流母线电容性电压的异常情况。除上下电容器之间的电压不平衡和电网电压角外,开路故障诊断方法不使用其他功能。仿真结果验证了所提故障检测方法的鲁棒性和有效性。

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