摘要
双馈变流器广泛应用于风力发电系统,双馈异步发电机在实际运行中存在超同步、亚同步和同步速3种工作状态,相对于其它两种状态,同步速工作模式下变流器存在严重三相电流不均衡的现象,直接导致三相IGBT模块的发热状态存在差异。根据IGBT温度纹波理论,对变流器在同步速工况下IGBT模块的过电流能力进行了深入研究,给出了一种可靠实用的分析方法。应用实例表明:所提分析方法对同步速下变流器的运行状态及IGBT模块的过流能力评估具有重要的指导意义。
The doubly-fed converter has been widely used for wind power generation system. During the operation of doubly-fed induction generator（DFIG）, there are three modes consist of super-synchronous speed, sub-synchronous speed and synchronous speed. Different from other two modes, the imbalance of three-phase current of converter occurs when DFIG is working in the synchronous speed mode. It can lead to the unbalanced heating of three-phase IGBT.The over-current capability of IGBT under the synchronous speed mode was analyzed according to the temperature ripple theory of IGBT. Moreover, a reliable and practical analysis method was presented. The examples of application illustrate that this proposed analysis method makes contribution to the evaluation of the operating state of converter and the over-current ability of IGBT under the synchronous speed mode.
出处
《电气传动》
北大核心
2015年第4期37-40,共4页
Electric Drive
关键词
双馈异步发电机
同步速
IGBT
变流器
doubly-fed induction generator（DFIG）
synchronous speed
insulated gate bipolar transistor（IGBT）
converter
