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| Fault Currents of the Doubly Fed Induction Generator with Constant AC Excitation |
| ZHANG Luhua,GUO Jiahu,CAI Xu,CAO Yunfeng,CHENG Mengzeng |
| (Wind Power Research Center, Shanghai Jiaotong University, Shanghai 200240, China) |
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Abstract This paper systematically analyzed the dynamic responses of doubly fed induction generator(DFIG) stator and rotor currents when threephase 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 squirrelcage induction machine subjected to threephase 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.
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Received: 18 March 2009
Published: 28 July 2010
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