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Study of Fault Current Characteristics of DFIG Considering Impact of Crowbar Protection
Author(s): 
Pages: 1-10
Year: Issue:  8
Journal: Transactions of China Electrotechnical Society

Keyword:  Doubly-fed induction generator(DFIG)crowbar protectionstator flux linkagefault current characteristicsequivalent calculation;
Abstract: In order to study the fault current characteristics of doubly-fed induction generator(DFIG) under symmetrical and asymmetrical fault conditions, dynamic model of DFIG in stator stationary reference frame is developed. On condition that a severe fault occurs and crowbar protection is activated, the dynamic characteristics of stator flux linkage of DFIG are studied. Moreover, a simplified calculation model of stator flux linkage is established with consideration of accuracy as well as simplicity. Based on it, the fault current characteristics DFIG under conditions of symmetrical faults and asymmetrical faults are analyzed and the analytical expressions are obtained. Besides, the equivalent calculation models of fault current are built. Finally, the digital simulation results show that the theoretical analysis results have high accuracy in the first two cycles after the fault occurs which can meet the requirements of the study of relaying protection principle and setting calculation.
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