Approximate Analytical Solution of Transient Free Response of DFIG and Its Time Scale Analysis
Xue Ancheng1, Liu Ruihuang1, 2, Geng Jiyu1, 3, Bi Tianshu1, Wang Qing1
1. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electrical Power University Beijing 102206 China; 2. Jiangsu Electric Power Research Institute Co. Ltd Nanjing 211100 China; 3. State Grid Shanghai Municipal Electric Power Company Shanghai 200122
Abstract：In this paper, the second-order differential equation of double-fed induction generator (DFIG) in complex field is established based on the fifth-order model of the DFIG, considering the stator and the rotor transients as well as the Thevenin equivalent circuit of the external system. Then, the approximate analytical solutions to the free responses of the flux and current and the corresponding approximate time constants formula are obtained. Furthermore, the verification approach for the proposed approximation is suggested, and the verification simulations are carried out. Moreover, the impacts of faults position and faults resistance on the time scales of the free responses are analyzed by simulations. The results show that the fault characteristics have great impacts on the time scale of the stator and rotor transients of DFIG. Therefore, the transient analyses with different faults require different models. Finally, the adaptability of the electromechanical transient model with or without the stator or rotor transient in the electromechanical transient analysis is discussed.
薛安成, 刘瑞煌, 耿继瑜, 毕天姝, 王清. 双馈风力发电机暂态自由响应近似解析解及其时间尺度分析[J]. 电工技术学报, 2017, 32(24): 214-223.
Xue Ancheng, Liu Ruihuang, Geng Jiyu, Bi Tianshu, Wang Qing. Approximate Analytical Solution of Transient Free Response of DFIG and Its Time Scale Analysis. Transactions of China Electrotechnical Society, 2017, 32(24): 214-223.
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2017, Vol. 32 
