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| 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 |
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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.
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Received: 10 May 2017
Published: 27 July 2018
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2018, Vol. 33 
