考虑基频结温波动的风电变流器可靠性评估

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Abstract On the basis of taking into account a mission profile of wind power converter for a long time, the existing lifetime estimation methods for power converters hardly consider the effect of fundamental frequency junction temperature fluctuations on the reliability of power converters. So a junction temperature iterative algorithm, which can quickly calculate junction temperature of power devices, is proposed in this paper. Compared with electro-thermal simulation, the proposed iterative method ensures more accurate, and greatly reduces the calculation time. Besides, a 1.2MW wind energy conversion system is regarded as a case study; junction temperature of power device is quickly calculated by means of the proposed method considering the actual wind speed and air temperature data, and then this paper utilizes the Bayerer life model and linear cumulative damage theory to assess the reliability of power converters. Finally, the evaluation results are verified, the reliability of the generator side converter is compared with that of the grid side converter, and the effect of fundamental frequency fluctuations and low frequency fluctuations on reliability of power converters are also discussed in this paper. The results show that for the high-power wind energy conversion system, the reliability of the generator side converter can be poorer, and reliability evaluation of power converters should not ignore the impact of fundamental frequency junction temperature fluctuations.

Key words： Reliability evaluation fundamental frequency junction temperature fluctuations low frequency junction temperature fluctuations iterative algorithm

Received: 08 December 2013 Published: 29 June 2015

PACS:	TM46
	TM71

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	Du Xiong
	Li Gaoxian
	Sun Pengju
	Zhou Luowei

Cite this article:

Du Xiong,Li Gaoxian,Sun Pengju等. Reliability Evaluation of Wind Power Converters Considering the Fundamental Frequency Junction Temperature Fluctuations[J]. Transactions of China Electrotechnical Society, 2015, 30(10): 258-265.

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https://dgjsxb.ces-transaction.com/EN/ OR https://dgjsxb.ces-transaction.com/EN/Y2015/V30/I10/258

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