The power difference of the wind farm in the AC and DC hybrid grid system can be transferred to the main network, the wind farm and the main network have the frequency stability problem, and the energy storage and VSC-HVDC additional control is proposed to adjust the frequency of the power system and optimize the frequency characteristics of the wind farm and the main network system. First, a VSC-HVDC frequency additional control based on the change of wind farm frequency is added to the wind farm side VSC-HVDC converter station to improve the frequency characteristics of the wind farm. Secondly, the energy storage system is connected to the DC line between the wind farm and the main network in parallel through the converter to compensate for the frequency deterioration of the main network caused by the additional DC control on the wind farm side and to improve the frequency characteristics of the main network. Finally, the frequency model of AC/DC hybrid grid connected wind farm system with energy storage and VSC-HVDC additional control is established. The example analysis shows that the frequency fluctuation of wind farm and main network can be effectively reduced by the combination of energy storage and VSC-HVDC additional control when the power balance of the wind farm is destroyed.