Due to flexible location

short construction cycle and rapid cost reduction

chemical energy storage has been applied to power grid peak load regulation in recent years. However

re-search on factors sensitive to optimal capacity of battery energy storage system suitable for peak load regulation is still insufficient.A model about optimal capacity of battery energy storage for peak load regulation is constructed. The model takes lowest social energy consumption cost as a goal

and planned or forecasted data of allkinds of power source and load in target planning year as boundary condition. The model makes full time production simulation foreach alternative capacity scheme of battery energy storage through-out the year

and solves it by mixed integer linear programming.Based on the work above

the sensitive factors that affect the optimal capacity of battery energy storage are summarized

and empirical research and analysis on the mode and degree of its influence are carried out. The results show that the energy storage factor

including unit investment cost and operating years

as well as demand factor such as peak load supply and low load adjustment

caninfluence the optimal capacity of battery energy storage and the total system cost.