In the procedure of carbon peaking and carbon neutrality energy revolution,large-scale renewable energy is aggrandizing frequency regulation capacity of power grid. How to make the best use of new rapid resources,represented by battery energy storage systems (BESS),in the secondary frequency regulation is the key to solve the problem. Firstly,a three-layer frame is designed,embodying area,cluster and plant,which can satisfy the needs for access monitoring and classification decision of various regulation resources in automatic generation control (AGC) system. Secondly,a coordination control strategy including BESS is proposed,and so is the strategy of regulation requirements assignment based on state of charge (SOC) effecting factor in BESS group. Finally,simulations are conducted for continuous disturbance cases from an actual power system,as well as simulations for tripping fault disturbances. The results show that the proposed strategy can improve the SOC consistency between the respective BESS,promoting the availability of BESS,and improve the performance of network frequency response characteristics either.