Based on the mathematical model of doubly-fed induction generator(DFIG)under harmonically distorted grid voltage conditions

the impact of power grid voltage harmonic on DFIG operation performance is analyzed. In order to suppress the 5th and 7th harmonics of stator current

the closed-loop control strategy of stator harmonic current is introduced based on the rotor current loop with proportional-integral-differential(PIR)regulator

avoiding the dependence of rotor current command calculation in conventional harmonic suppression control strategy on generator parameters. With the increasing of R regulator gain coefficient in stator harmonic current loop

the suppression on stator harmonics is more obvious

but it will decrease the anti-power disturbance. By introducing the harmonic damping control

the system anti-disturbance ability is enhanced on the basis of maximum suppressing stator current harmonics. Consequently

the system robustness is improved

and the system dynamic response is accelerated. Considering dynamic and steady state characteristics

the influence of parameters change on the system is analyzed. The effectiveness of the proposed control strategy is validated by the experiment and simulation. This work is supported by National Natural Science Foundation of China(No. 51277050)and State Grid Corporation of China(No. NY71-15-037).