Study on Unified Analysis Method and Characteristics in Fault Currents of Doubly-Fed Induction Generators
Xiao Fan1, Zhang Zhe2, Lai Qinghua2, Liu Huiyuan3, Liu Wei3
1. State Grid Hubei Electric Power Research Institute Wuhan 430077 China; 2. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China; 3. Yangjiang Power Supply Bureau of Guangdong Power Grid Corporation Yangjiang 529500 China
Abstract：The analysis for the fault current characteristics of the new energy sources is the basis in relay protection and fault analysis of the power grid. For generators of doubly-fed type, due to its special structure and complicated transient characteristics, especially under asymmetric fault conditions, the fault current characteristics of doubly-fed induction generator (DFIG) are related to low-voltage through control strategy, and there are a lot of control strategies. In order to address this issue, the unified analysis method in the fault currents of a DFIG is studied. Firstly, the mathematical model of a DFIG under the asymmetric fault conditions is proposed. Then, the equivalent models of inner rotor current control loop are established by considering the dynamic response of a rotor-side converter (RSC) and the notch filters, and the simplified calculation models of rotor fault current are established. As a result, the unified fault current analytical expressions of a DFIG are obtained, which is applicable for different control strategies. Finally, simulation examples in PSCAD/EMTDC verify the theoretical analysis results.
肖繁, 张哲, 赖清华, 刘慧媛, 刘玮. 双馈型电源短路电流统一解析方法及特性分析研究[J]. 电工技术学报, 2018, 33(14): 3319-3331.
Xiao Fan, Zhang Zhe, Lai Qinghua, Liu Huiyuan, Liu Wei. Study on Unified Analysis Method and Characteristics in Fault Currents of Doubly-Fed Induction Generators. Transactions of China Electrotechnical Society, 2018, 33(14): 3319-3331.
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2018, Vol. 33 
