We studied that the capacity configuration of lithium titanate battery in whole grid frequency regulation on the rate characteristic

to solve the contradiction between the requirements of grid frequency regulation capacity and the opportunity cost of frequency regulation capacity under the extreme event of power grid.Through analyzing coupling features of the primary and second frequency regulation in the grid that energy storage battery participates in

we put forward a method of energy storage battery capacity configuration by combining with the equivalent conversion method of using the time of action at different charge/discharge rate characteristics of lithium titanate batteries.Moreover

taking emergency（extreme） accidents occurring in the grid（sudden tripping of the generator or increasing in load） for example

We simulated and analyzed the capacity configuration of energy storage battery in frequency regulation by model of regional power grid.The results show that the capacity required for the lithium titanate battery in high rate is lower than that without considering the rate characteristics in terms of the same perturbation conditions.The simulation verifies the effectiveness of the proposed method and the advantages of the energy storage battery considering the charge/discharge rate characteristics in frequency regulation.