Diagnostic and fault tolerant control by adaptive observer of doubly-fed induction generators with inter-turn rotor and stator fault based wind turbine

The aim of this paper is to develop a doubly-fed induction generator (DFIG) wind turbine model suitable for the simulation of this generator in the healthy mode and faulty mode. The dynamic model of a DFIG with rotor and stator inter-turn short circuit fault is proposed. A model (abc) is developed, which can represent both the healthy and faulty conditions. The DFIG is directly connected to the grid whereas the rotor winding is fed by back-to-back PWM converters the Control schemes for active and reactive power regulation are designed firstly. Under different wind speed, maximum power point tracing (MPPT) control is implemented to ensure the optimum active power output. The numerical simulation developed in Matlab/Simulink studies the effects of rotor and stator inter-turn short-circuit in the DFIG. Afterward, the application of Approach technique of Adaptive Observer is used to detect this type of fault. Simulation results for this faults are shown and elucidated.