Due to the operation characteristics, the doubly-fed induction generator no longer has the inertial response ability of synchronous generator, weakening the inertial response ability in the power system on the large scale grid connected doubly-fed induction generator. After the power disturbance of the system, it is not enough to maintain the frequency change in the prescribed range, which has an adverse effect on the stable operation of the power system. In this paper, the influence of wind turbine on power system is analyzed at first, on this basis,the virtual inertial control strategy of additional speed optimization of doubly-fed induction generator is proposed,and the speed optimization module is added to the traditional virtual inertial control, and combine with speed control, so that the rotor releases or absorbs more energy in a smoother way ,reducing the impact on the rotor releases or absorbs more energy in a smoother way, reducing the impact on the power grid, and in the control strategy. The rotor speed protection module is added to prevent the rotor speed from being too low or too high,which will cause the rotor to cut out the power grid or cause damage to the rotor, so that the doubly-fed induction generator unit has the same characteristics as the conventional synchronous generators. Finally, in the case of load mutation in the power grid, the additional speed optimization virtual inertia control and integrated control are introduced for simulation. The virtual inertia control integrated control are introduced to simulate and verify the effectiveness of the propoesed control strategy if the system inertia is further reduced.