In order to solve underdamping oscillation of doubly fed induction generator (DFIG) aroused by grid fault,a flux damping control method for DFIG based on equivalent rotor voltage was proposed.State equation of the stator flux linkage was established.The oscillation frequency and damping ratio of stator flux linkage by means of solving the characteristic root was analyzed.The rotor voltage feedforward compensation with the addition of the stator flux linkage derivative feedback compensation could get equivalent rotor voltage reference.The mechanism about how to improve underdamping character of stator flux linkage and accelerate the speed of attenuation of transient flux dc component was proposed.The simulation results demonstrated that the proposed method suppressed the oscillation of the stator flux linkage and enhanced the DFIG voltage fault ride through capability.
