Abstract: Improper parameter settings in traditional virtual inertia control for DFIG may cause a risk of wind turbine stall, and a momentary decrease in DFIG active power output can lead to a secondary drop in frequency.To address these problems,this paper proposes an improved virtual inertia control strategy. The duration for maintaining the active power output is set based on the occurrence time of the frequency nadir to reduce the unnecessary rotor kinetic energy release. In wind turbine speed recovery stage,the active power output decreases slowly with time to the maximum power point tracking of the wind turbine,reducing the secondary frequency drop. Finally,a high proportion of wind power penetration power system is established based on EMTP-RV simulation platform,and the effectiveness and superiority of the proposed method are verified under different variable wind speed conditions.