To study the transient current characteristics of doubly fed induction wind turbines(DFIG)under symmetrical and a-symmetrical voltage surges in the power grid,and to improve their fault tolerance,this article provides a detailed analysis on the transient transition process of the stator and rotor flux linkage of DFIG under symmetrical and asymmetric voltage surge faults in the power grid.On this basis,the stator and rotor transient current expressions of doubly fed wind turbines were derived,and their fault current characteristics were studied.Using the MATLAB/Simulink simulation platform,the obtained analytical ex-pressions were compared with the time-domain simulation results.The simulation waveform and theoretical waveform were in good agreement,verifying the correctness of DFIG fault current characteristics and providing a direct basis for accurately analy-zing DFIG fault tolerance.
关键词
双馈感应风力发电机/故障电流特性/暂态特性/高电压穿越
Key words
doubly-fed induction generator/fault current characteristics/transient process/high voltage ride through
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