风电全功率变流器参数对可靠性的影响分析

发布时间：2018-10-22 07:36

【摘要】：风速的随机变化使得风电变流器处理变化的功率,导致器件的温度产生波动,影响变流器的可靠运行。现有的基于一个工作状态下的风电变流器可靠性评估,无法反映负载随机变化造成器件温度波动对变流器可靠性的影响。功率器件失效的主要形式为铝键合线失效与焊料层疲劳,本文综合考虑这两种失效因素,给出了可靠性评估模型和评估方法,分析了开关频率、功率因数及散热热阻的变化对风电全功率变流器可靠性的影响,并以1MW永磁同步风力发电机为例结合实际的风速及气温数据进行了验证。实例结果表明,开关频率与散热热阻的变化对变流器可靠性的影响比较大。根据分析结论,讨论了针对风电变流器的实际工作环境,考虑风速的概率分布,对利用变频或变散热条件的控制措施以提高变流器可靠性的可行性。结果表明,可通过根据风速等工况来改变开关频率和散热条件来提高变流器的可靠性。
[Abstract]:The random variation of wind speed makes the wind power converter deal with the varying power, which leads to the fluctuation of the device temperature and affects the reliable operation of the converter. The existing reliability evaluation of wind power converter based on a working state can not reflect the effect of temperature fluctuation on the reliability of converter caused by random variation of load. The main forms of power device failure are aluminum bonding line failure and solder layer fatigue. In this paper, the reliability evaluation model and method are given, and the switching frequency is analyzed. The effect of power factor and heat dissipation resistance on the reliability of wind power converter is verified by 1MW permanent magnet synchronous wind generator (PMSG) combined with actual wind speed and temperature data. The results show that the change of switching frequency and heat dissipation resistance have great influence on the reliability of converter. According to the conclusion of the analysis, the feasibility of improving the reliability of the converter by using variable frequency or variable heat dissipation condition is discussed, considering the probability distribution of wind speed and considering the actual working environment of wind power converter. The results show that the reliability of the converter can be improved by changing the switching frequency and heat dissipation condition according to the wind speed and other working conditions.
【作者单位】：重庆大学输配电装备及系统安全与新技术国家重点实验室;
【基金】：国家自然科学基金重点资助项目(51137006) 重庆市杰出青年科学基金项目(CSTC2012JJJQ90004) 输配电装备及系统安全与新技术国家重点实验室重点资助项目(2007DA10512711101)
【分类号】：TM46;TM614

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