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Open AccessArticle

Fault Current Characteristics of the DFIG under Asymmetrical Fault Conditions

State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan 430074, China
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Author to whom correspondence should be addressed.
Academic Editor: Frede Blaabjerg
Energies 2015, 8(10), 10971-10992; https://doi.org/10.3390/en81010971
Received: 20 July 2015 / Revised: 7 September 2015 / Accepted: 16 September 2015 / Published: 30 September 2015
(This article belongs to the Collection Wind Turbines)
During non-severe fault conditions, crowbar protection is not activated and the rotor windings of a doubly-fed induction generator (DFIG) are excited by the AC/DC/AC converter. Meanwhile, under asymmetrical fault conditions, the electrical variables oscillate at twice the grid frequency in synchronous dq frame. In the engineering practice, notch filters are usually used to extract the positive and negative sequence components. In these cases, the dynamic response of a rotor-side converter (RSC) and the notch filters have a large influence on the fault current characteristics of the DFIG. In this paper, the influence of the notch filters on the proportional integral (PI) parameters is discussed and the simplified calculation models of the rotor current are established. Then, the dynamic performance of the stator flux linkage under asymmetrical fault conditions is also analyzed. Based on this, the fault characteristics of the stator current under asymmetrical fault conditions are studied and the corresponding analytical expressions of the stator fault current are obtained. Finally, digital simulation results validate the analytical results. The research results are helpful to meet the requirements of a practical short-circuit calculation and the construction of a relaying protection system for the power grid with penetration of DFIGs. View Full-Text
Keywords: wind power; doubly-fed induction generator (DFIG); fault current characteristics; non-severe fault; asymmetrical fault wind power; doubly-fed induction generator (DFIG); fault current characteristics; non-severe fault; asymmetrical fault
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MDPI and ACS Style

Xiao, F.; Zhang, Z.; Yin, X. Fault Current Characteristics of the DFIG under Asymmetrical Fault Conditions. Energies 2015, 8, 10971-10992.

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