THE DESIGN OF ROTOR POSITION OBSERVER FOR DFIG DURING TRANSIENT GRID VOLTAGE IMBALANCE

A rotor position observer based on hysteresis comparator (HC) was presented to acquire the rotor position angle of the Doubly-fed induction generator (DFIG) under unbalanced grid Voltage conditions. The position and velocity of DFIG's rotor were estimated by the observer with hysteresis comparator. The system structure is relatively simple, without adjusting any parameters, easy to achieve. Simulation model for wind energy generation system-with DFIG is set up. The simulation results show that the control strategy is feasible and efficient.