恒定交流励磁时双馈感应发电机的短路电流

系统地分析了三相机端短路状况下,双馈感应发电机(DFIG)定、转子电流的动态响应,提出了计算DFIG短路电流的新方法.将三相机端短路的DFIG等效为稳态运行的转子励磁异步电机和三相机端短路的鼠笼型异步电机,运用空间矢量的方法分别求解,得到DFIG短路电流的解析表达式,确定了最大短路电流及其出现时刻,同时分析了短路电流中的主要成分以及它们之间的相互关系.以上结论通过Matlab/Simulink仿真进行了验证.

Fault Currents of the Doubly Fed Induction Generator with Constant AC Excitation

This paper systematically analyzed the dynamic responses of doubly fed induction generator(DFIG) stator and rotor currents when three phase short circuit occurs at stator terminals, and also presented a new approach in which the DFIG under fault condition is equivalent to a rotor excited induction machine running in a steady state and a squirrel cage induction machine subjected to three phase short circuit, to get the fault currents. Space vector analysis was introduced to get the analytical expression of fault currents. The maximum rotor and stator short circuit currents as well as the times when they appear were proposed. Furthermore, main components of the short circuit currents and their relations were presented. Finally, all above results are validated in Matlab/Simulink.