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

doi:10.19595/j.cnki.1000-6753.tces.211418

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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.

Key words： Modular multilevel converter (MMC) fault detection fault diagnosis local outlier factor (LOF)

Received: 08 September 2021

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TM46

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	Articles by authors
	Liu Zuochen
	Lin Lei
	Yin Tianxiang
	Huang Yihong
	Shi Xiaojie

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Liu Zuochen,Lin Lei,Yin Tianxiang等. A Fast Open-Circuit Fault Detection and Diagnosis Method for Sub-Modules of Modular Multilevel Converters[J]. Transactions of China Electrotechnical Society, 2022, 37(19): 4883-4894.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.211418 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I19/4883

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