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Unsymmetrical short circuit current analysis of doubly fed induction generators with crowbar protection
Author(s): 
Pages: 7-12
Year: Issue:  2
Journal: Relay

Keyword:  doubly fed induction generators (DFIG)unsymmetrical faultcrowbar protectionshort-circuit current characteristicsfault analysis;
Abstract: Electromagnetic transient characteristics of doubly fed induction generator (DFIG) are very complex during the terminal voltage severely dips. One issue that has not received much attention so far is the contribution of DFIG to the asymmetrical short-circuit fault. In order to describe the DFIG’s asymmetrical short-circuit current characteristics accurately, positive and negative sequence vector model of DFIG are established based on space vector theory and sequence component method. Considering the different initial operating power of DFIG, the accurate mathematical expressions of the stator and rotor flux after crowbar insertion is deduced through mathematical analysis. After that, then the accurate expressions of the stator and rotor short circuit current are derived. The method is also suitable for the calculation of DFIG short circuit when symmetrical fault occurs. Finally, the mathematical expressions of stator current are verified according to the standard DFIG model in MATLAB/SIMULINK under the cases of symmetrical and asymmetrical voltage dips respectively.
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