Asymmetrical Short-Circuit Response of the Wound Rotor Brushless Doubly-Fed Generator in Wind Turbines

This paper studies the dynamic response of the wound rotor brushless doubly-fed generator (BDFG) in asymmetrical fault conditions in the wind turbine. Physical behaviors under asymmetrical short-circuits are described by generalized analytical solutions and the relationship between flux linkage vectors is derived. The symmetrical components theory is applied to calculate the asymmetrical short-circuit current. Simulations by Simulink are carried out and results are compared with analytical calculations. The agreement of all results verifies the proposed analytical method in predicting the asymmetrical fault response of the BDFG.