This paper proposes a wind turbine virtual inertia control strategy for high frequency problems in power systems based on virtual inertia technology. According to the strategy, the wind turbines under moderate or low wind speed zone are available to engage in primary frequency control for high frequency problems. Based on proportion-differential(PD) virtual inertia method, this strategy recovers MPPT control process of wind turbines in frequency control period when the rotor speeds of the turbines reach their limits. It also demands the wind turbines exit inertia control when the system frequency reaches the highest point, and sets the limitation of the electromagnetic power corresponding with the reference value of electromagnetic torque. Applying this strategy, system simulation is carried out for the directly-driven wind turbines under different wind speeds ranged in moderate or low wind speed zone which encountering a frequency ascend fault. The results show that the strategy can effectively decrease the highest level of the system frequency in power systems penetrated by wind powers, and the strategy is available for wind turbines under different wind speeds ranged in moderate or low wind speed zone to engage in primary frequency control.