Abstract: On the basis of exploring the frequency regulation ability of doubly-fed induction machine pumped storage hydro（DFIMPSH）unit,a system frequency control method based on improved deep deterministic policy gradient（DDPG）algorithm is proposed.Firstly,based on the frequency regulation links of DFIM-PSH in generating and pumping modes,the frequency control model of singleregion system with DFIM-PSH considering wind power integration is constructed. Secondly,aiming at minimizing the system frequency deviation and unit’s output for frequency regulation,improved DDPG algorithm is introduced to optimize the AGC instructions of each unit taking the unit’s operating constraints into account. By introducing random external disturbances and model parameter changes in the pre-learning process,the adaptability of AGC controller in environment with strong uncertainty is improved. Finally,on the basis of verifying the advantages of DFIM-PSH,simulations under different wind power integration and disturbance scenarios are carried out.The results show that the proposed frequency control method can effectively improve the frequency characteristics of power system and has strong robustness.