Abstract：Owing to its maturity, stability and economy, doubly-fed induction generator (DFIG) is dominant in wind power generation system. In the actual operation process, the alternating thermal stress caused by random wind speed and changes in operating condition makes the reliability of the wind power converter gradually decrease. Most of the reliability evaluation models of wind power converter only consider the large load action or adopt the Miner linear fatigue cumulative model, while ignoring the influence of the small load and the health status on module remaining life. In this paper, the two factors are considered, and the two-stage fatigue accumulative model is used to establish the reliability evaluation model of converter. The power cycle test is designed to validate this model. At the same time, a 1.5MW doubly-fed wind power converter is analyzed under the actual wind speed, and the influence of the switching frequency and environment temperature on the reliability of doubly-fed wind power converter is compared under different health conditions. The results show that the switching frequency and the ambient temperature have great effects on the reliability of the converter, and the failure rate of the wind power converter rises significantly with the aging of the power device.
黄涛, 陈民铀, 赖伟, 徐盛友, 罗丹. 计及疲劳累积及健康状态的风电变流器可靠性评估模型[J]. 电工技术学报, 2018, 33(20): 4845-4854.
Huang Tao, Chen Minyou, Lai Wei, Xu Shengyou, Luo Dan. Reliability Evaluation Model of Wind Power Converter Considering Fatigue Accumulation and Health Status. Transactions of China Electrotechnical Society, 2018, 33(20): 4845-4854.
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2018, Vol. 33 
