Rotor winding inter-turn fault analysis of doubly-fed induction generator based on negative sequence component

Inter-turn short circuit fault is the main fault type of doubly-fed induction generator (DFIG), so online monitor and fault diagnose are particularly necessary for DFIG. However, due to the presence of the generator external imbalances, winding inter-turn fault diagnosis is difficult. Based on the finite element model, we analyzed the negative sequence current and harmonic components generated by the rotor winding inter-turn fault of DFIG. We get the features of rotor inter-turn fault in DFIG, and the fault characteristics in the case of grid imbalance.