A Fast Open-Circuit Fault Detection and Diagnosis Method for Sub-Modules of Modular Multilevel Converters
Liu Zuochen, Lin Lei, Yin Tianxiang, Huang Yihong, Shi Xiaojie
State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan 430074 China
Abstract：Based on the abnormal change of capacitor voltage caused by the fault of the modular multilevel converter (MMC) sub-module (SM) switching device, a fast fault detection and diagnosis method was proposed in this paper. The local outlier factor (LOF) algorithm was used to analyze the stepwise summation value of capacitor voltages of all sub-modules in one arm, so as to detect and locate the faulty SM(s) rapidly and simultaneously. Then, from the capacitor voltage variation of the healthy SM in the same arm, the faulty switching device can be quickly identified and the fault classification can be completed. Because the proposed method can analyze local abnormal characteristics, it can be applied to any fault types including single fault, multiple faults in the same arm and multiple faults in different arms. The proposed method is not affected by the uncertainty of system parameters, and has strong applicability and fast diagnostic speed. Simulation and experimental results verify the effectiveness of the proposed method.
刘座辰, 林磊, 殷天翔, 黄一洪, 时晓洁. 一种模块化多电平换流器子模块开路故障的快速检测与诊断方法[J]. 电工技术学报, 2022, 37(19): 4883-4894.
Liu Zuochen, Lin Lei, Yin Tianxiang, Huang Yihong, Shi Xiaojie. A Fast Open-Circuit Fault Detection and Diagnosis Method for Sub-Modules of Modular Multilevel Converters. Transactions of China Electrotechnical Society, 2022, 37(19): 4883-4894.
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