FEM analysis on interturn fault of rotor wingding in DFIG

The stable operation of Doubly-fed induction generator (DFIG) is vital to wind power overall system reliability. The rotor winding inter-turn short circuit fault is one of the common electrical faults in DFIG, so it is necessary to research the fault features of DFIG with rotor winding inter-turn short circuit fault. The finite element model (FEM) of DFIG was presented and used to simulate the electromagnetic field distribution of DFIG under different degree of rotor inter-turn short circuit fault. The phase angle difference, the harmonic content of rotor currents and the harmonic content of air gap flux density were also explored. The approach presented in this paper will provide the basis for the protection of DFIG with rotor inter-turn short circuit fault.