双馈风电变流器IGBT模块损耗及结温的计算分析及变化规律研究

Doubly Fed Wind Power Converter Module IGBT Loss and Junction Temperature Calculation and Variation Research

针对双馈风电机组变流器由于IGBT模块失效造成高故障率的问题,提出了在不同工况下其IGBT模块结温的准确计算方法及其变化规律分析。首先,建立了机侧及网侧变流器IGBT模块基于开关周期的损耗及结温计算模型;其次,在全工况运行下对机侧及网侧变流器IGBT模块损耗和稳态结温的变化规律进行了分析。结果表明,随着风速的不断增加,机侧及网侧变流器IGBT模块的损耗总体呈增大趋势,二者变化趋势局部不同;机侧变流器IGBT模块结温变化要比网侧的更为剧烈。

Aiming at the problem of the high failure rate caused by the IGBT module of the converter of double fed wind turbine generator,a calculation model under different working conditions of IGBT junction temperature and effect analyses were investigated.Firstly,a calculation model based on the switching period of machine side and grid side converter IGBT module was presented.Secondly,the effects of the IGBT steady state junction temperature were analyzed under conditions of different wind speed.Results showed that,with increasing wind speed,the overall loss of machine side and grid side converter IGBT module showed increasing trend,the change trend of the two parts was different in the local area.The temperature change of the IGBT module of the machine side converter is more severe than that of the net side.