6. Rotor Fault Slot Positioning of Doubly Fed Induction Generators Based on Wavelet Decomposition

Doubly fed induction generator (DFIG) is widely used in the field of wind power, and the rotor windings inter-turn short-circuit fault of DFIG is one of the focuses of the current domestic and international research. Taking into account the special characteristics of the structure and operational, it is difficult to make accurate positioning of inter-turn short-circuit fault of DFIG. In this chapter, the finite element theory and Ansoft are used to simulate and analyze the diffidence of flux density between the DFIG running in normal and rotor windings inter-turn fault, getting the variation characteristics. It is indicated the feasibility of locating a fault slot from the perspective of the magnetic properties. Then, the position of fault slots is located by the data, collecting by the combination of the detection coil and optoelectronic devices, and detecting by wavelet decomposition.