Abstract：Random change of the wind speed makes the wind power converter process changeable power, leading to temperature variation for power devices, which affects the converter reliability. Existing methods evaluate the converter reliability based on one operating point, where the impact of temperature fluctuation of power devices on the converter reliability can’t be shown. Given that the main failure mechanisms of power devices are wire bond off and solder fatigue, the corresponding model and method for reliability evaluation is presented considering both these failures to analyze the effect of switching frequency, power factor and thermal resistance of heat sink on the reliability of full size converter in the wind turbine. Then combined with actual wind speed and air temperature, a 1MW wind turbine of permanent magnetism synchronous generator(PMSG) is illustrated and the result is verified. The result shows that the switching frequency and thermal resistance of heat sink have relatively great influence on the converter reliability. According to the conclusion analyzed, considering the distribution of the wind speed, the feasibility of increasing the wind power converter reliability based on the change of switching frequency or thermal dissipated condition is discussed in view of actual work condition of the converter. The result indicates that the increase of the converter reliability can be achieved by changing them based on the wind condition.
杨珍贵,杜雄,孙鹏菊,周雒维. 风电全功率变流器参数对可靠性的影响分析[J]. 电工技术学报, 2015, 30(16): 137-145.
Yang Zhengui,Du Xiong,Sun Pengju,Zhou Luowei. Analysis of Effect of the Converter Parameters on Full-Rated Wind Power Converters Reliability. Transactions of China Electrotechnical Society, 2015, 30(16): 137-145.
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