基于 SPWM 的直驱风电变流器功率模块分析

摘要:

基于新疆地区特殊的地理环境造成的风电变流器 IGBT 功率模块由于承受剧烈的交变热应力而失效的情况， 以某 1． 5 MW 直驱风电变流器为研究对象，建立了其仿真模型，并推导了网侧以及机侧变流器功率模块的损耗和结温 表达式。结合风电场实测风速，研究了变流器功率器件的损耗变化规律，分析了变流器各部件所受热应力冲击情况。 研究结果表明网侧变流器的 IGBT 模块损耗最高，最易损坏。

Abstract:

In view of the special geographical environment of Xinjiang，the IGBT power module of wind power converter bears the severe alternating thermal stress，so breakdown occurs frequently． Taking a 1． 5 MW direct － driven wind power converter as the research object，the simulation model is established，and the expressions of the loss and junction temperature are derived for converter power module at the machine side and the grid side． Based on the measured wind speed of wind farm，the variation law of power module is studied，and the thermal stress received by each component is evaluated． The results show that IGBT module at the grid side has the largest losses and is the most easily damaged．