Large scale wind power integration will decrease the system’s frequency control capability and increase its cost as the speed of DFIG is decoupled from the grid frequency. To enhance primary frequency control ability of DFIG in all wind conditions and combine the advantages of auxiliary inertial control, over-speed control and pitch control, this paper proposes a new strategy that in maximum power tracking area coordinated inertia and over-speed control strategy is adopted while in other operate areas, pitch angle control and auxiliary inertial control are combined to achieve frequency regulation. Because of the complicated nonlinear relationship between wind energy utilization coefficient and pitch angle and tip speed ratio, this paper adds a pitch angle compensation and a frequency response module into traditional pitch control, which simplifies the pitch control strategy. Lastly, simulation results verify the validity of proposed method. This work is supported by National High-tech R & D Program of China (863 Program) (No. 2012AA050201).