Fault Diagnosis based on Current Signature Analysis for Stator Winding of Doubly Fed Induction Generator in Wind Turbine

With the development of wind power industry, early detection and diagnosis of incipient faults are desirable for the wind generators. A suitable model enables generator faults to be simulated and it is particularly useful for gaining an insight into their dynamic behavior and electro-mechanical interaction. In this paper a model of DFIG (Doubly-Fed Induction Generator) affected by stator inter-turn short circuit fault is presented. The mathematical model is established to simulate healthy and inter-turn fault conditions based on synchronous rotating reference frame. In the simulation, the negative-sequence component of stator currents and phase differences between any two phases are as detection features. The results of the simulation confirmed the validity of the model.