基于波形实时分析的动车组三电平逆变器故障诊断技术

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Abstract Multilevel inverters have widely applied in high-voltage and high-power applications. Therefore, fault diagnosis of such circuits is becoming more and more important. Diagnosis of single device open circuit fault for a three-level inverter is discussed in this paper. According to direction of the modulation voltage and corresponding phase current, working period of the inverter is divided into four working ranges. When the fault of device open circuit occurrs in different working range, the bridge voltage is analyzed in detail and three fault diagnosis criterions is proposed. Based on the bridge voltage level and its duration, a kind of circuit is designed to achieve automatic diagnosis for device open circuit fault. The experimental result shows that the method can isolate fault patterns proposed exactly and quickly.

Key words： Three-level inverter fault diagnosis bridge voltage real-time waveform analysis

Received: 21 March 2012 Published: 05 November 2014

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TM464

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	Chen Danjiang
	Ye Yinzhong
	Hua Rong

Cite this article:

Chen Danjiang,Ye Yinzhong,Hua Rong. Fault Diagnosis for Three-Level Inverter of CRH Based on Real-Time Waveform Analysis[J]. Transactions of China Electrotechnical Society, 2014, 29(6): 106-113.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2014/V29/I6/106

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