柔性直流输电系统中IGBT阀的故障诊断方法

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Abstract

Open-circuit failure of IGBT valve in voltage sourced converters based high voltage direct current(VSC-HVDC) system may lead to abnormal operation of converters, and the research on its fault diagnosis has great significance for the safety and reliability of the whole system. In this paper, based on two-level VSC-HVDC, three-phase current at alternating side when open-circuit fault occurs in IGBT valve is analyzed. The variation law of direct current component in fault phase is obtained. Furthermore, the influence of transmission power saltation on fundamental component of three-phase alternating current is studied. Accordingly, a simple and high-speed locating method for fault switch is put forward. According to the phase difference of fundamental component of each phase current, the method determines the system state at first. On the premise of excluding power mutation, the per-unit value of direct current component is used as diagnostic variable to locate fault power switch. Finally, the condition that open-circuit fault occurs in a IGBT valve after power flow reversal is simulated, and the diagnosis is conducted with the proposed method. The results show that the method presented in this paper not only locates rapidly and accurately the faults location, but also avoids misdiagnosis caused by power mutation.

Key words： Voltage sourced converter based high voltage direct current IGBT valve open-circuit fault diagnosis short-time Fourier transform

Received: 25 January 2013 Published: 05 November 2014

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TM461

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	Sun Xiaoyun
	Tong Xiangqian
	Gao Xin

Cite this article:

Sun Xiaoyun,Tong Xiangqian,Gao Xin. Research on the Fault Diagnosis of IGBT Valve in VSC-HVDC[J]. Transactions of China Electrotechnical Society, 2014, 29(8): 235-241,264.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2014/V29/I8/235

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