Abstract：A probability model for lifetime evaluation of power electronics devices is established in this paper firstly,which can consider the effect of wind speed probability distribution on the lifetime of power devices.Reliabilities of power devices for different wind energy conversion systems (WECS) at various wind sites are evaluated,and then the relationship between the wind speed distribution and the lifetime of power devices is deeply analyzed.Finally,the conclusions are further discussed and verified.The results show that the great majority of the lifetime of power devices due to the fundamental frequency thermal junction temperature fluctuation at actual wind sites is consumed in the specific wind range,which is higher than the specific value close to the rated speed,with small probability.To reduce the lifetime consumption of power devices efficiently,the operation conditions of WECS within different wind speed ranges can be managed via two different strategies.This paper provides a new idea for extending the lifetime of wind power converters.
杜 雄 ,李高显 ,刘洪纪, 孙鹏菊, 周雒维. 风速概率分布对风电变流器中功率器件寿命的影响[J]. 电工技术学报, 2015, 30(15): 109-117.
Du Xiong Li, Gaoxian ,Liu Hongji, Sun Pengju ,Zhou Luowei. Effect of Wind Speed Probability Distribution on Lifetime of Power Semiconductors in the Wind Power Converters. Transactions of China Electrotechnical Society, 2015, 30(15): 109-117.
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2015, Vol. 30 
