考虑不同时间尺度的风电变流器功率模块可靠性评估模型

发布时间：2018-05-11 03:13

本文选题：风电变流器 + 可靠性评估　；参考：《电测与仪表》2016年21期

【摘要】：考虑到变风速运行下风电变流器功率模块的结温波动既受到风速的影响,同时也存在由换流引起的基频结温波动。为了综合衡量这两个时间尺度下结温波动对变流器可靠性的影响,提出考虑不同时间尺度下结温波动特点的可靠性评估模型。针对受风速影响较大的长时间尺度结温波动,根据FIDES可靠性评估导则,引入热应力因子和温度循环因子对不同风速均值、风速湍流强度运行状态下的可靠性影响进行评估。针对由换流引起的短时间尺度下的基频结温波动,采用多状态概率评估思想将风速大小进行概率划分,并基于功率模块失效机理评估不同风速对功率模块故障率的贡献。最后,以某风场变流器为例,对其可靠性进行评估,并分析设计参数对可靠性的影响。文中结论对于制定检修计划,提高功率模块设计可靠度提供了依据。
[Abstract]:Considering that the junction temperature fluctuation of the power module of wind power converter under variable wind speed is affected by the wind speed, there is also the fundamental frequency junction temperature fluctuation caused by the commutation. In order to synthetically measure the effect of junction temperature fluctuation on converter reliability, a reliability evaluation model considering the characteristics of junction temperature fluctuation at different time scales is proposed. According to the FIDES reliability evaluation guidelines, thermal stress factor and temperature cycle factor are introduced to evaluate the reliability of different mean wind speed and turbulent intensity of wind speed. In view of the fundamental frequency junction temperature fluctuation caused by commutation in a short time scale, the multi-state probability evaluation idea is used to divide the wind speed probability, and based on the failure mechanism of power module, the contribution of different wind speed to the failure rate of power module is evaluated. Finally, the reliability of a wind field converter is evaluated and the influence of design parameters on reliability is analyzed. The conclusion provides the basis for making maintenance plan and improving the reliability of power module design.
【作者单位】：重庆三峡学院信号与信息处理重点实验室;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;国网重庆市电力公司万州供电分公司;
【基金】：国家自然科学基金资助项目(51377184) 重庆市教委科学技术研究项目(KJ1501010)
【分类号】：TM46;TM614

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