A novel sensorless control strategy of doubly fed induction generator

Available sensorless speed control strategies of doubly fed induction generator (DFIG) usually fail around the synchronous speed or limited by the operation mode (motor or generator). A novel control strategy is proposed in this paper. It uses the stator flux magnetizing current to estimate the rotor position and speed. This strategy works properly in the whole speed range. The principle of the speed and position estimation is explained and the corresponding speed regulation system is built. The proposed control strategy is examined in Simulink. The simulation results demonstrate the feasibility of the stator flux magnetizing current based rotor position and speed estimation as well as the control behaviors of the speed regulation system.