The Detection Method of an Inter-turn Short Circuit Fault in the DFIG Stator Based on the Voltage and Current

Nowadays, a doubly-fed induction generator (DFIG) performs an important role in wind power generation. Stator inter-turn short circuit faults are one of the major faults in DFIGs and can adversely affect the operation of DFIGs. Therefore, it is crucial to detect the inter-turn short circuit fault for the proper operation of the DFIG. In this paper, a voltage and current method, without additional sensors and complex operations, is proposed to diagnose the short circuit fault. Firstly, a doubly-fed wind power generation system model is established by using MATLAB/Simulink software. The voltage and current of phase A stator windings under the normal state and inter-turn short circuit faults are obtained by this model. Then, Lissajous figures under different states of phase A stator windings are synthesized from the above voltage and current. Finally, the feasibility of the proposed voltage and current method for detecting the short circuit between turns of the stator winding is proved by comparing the Lissajous under normal and fault conditions, and the variation characteristics of the Lissajous figure are deduced. The simulation results show that using the voltage and current method to detect DFIG stator inter-turn short circuit faults is feasible.