In the Model Reference Adaptive System (MRAS) rotor estimation method based on Doubly-Fed Induction Generator (DFIG) rotor current, the estimation speed amplitudes of DFIG show different degrees AC ripple because of stator, rotor voltage and current sample signal drift and AD transform deviation. On this basis, a control strategy based on PI and Proportional Resonant (PR) controller is proposed in the adaptive adjusting mechanism. AC ripple in the speed estimation caused by the angular frequency and slip frequency can be eliminated in the proposed method, accurate speed estimation is achieved and the power generation quality of doubly fed generator is improved. Experiments are carried out based on 10 kW doubly fed wind power generation simulation platform, the superiority is verified by comparing with PI control and PI parallel proportional resonant control. This work is supported by National Natural Science Foundation of China (No. 51207002), Industrial Science and Technology Research of Shaanxi Province (No. 2013K07-12 and 2016GY-130), and Natural Natural Scientific Research Program Funded by Shaanxi Province (No. 2014JM8347).