Optimal configuration of battery energy storage system in primary frequency regulation

Abstract

This article proposes a novel capacity optimization configuration method of battery energy storage system (BESS) considering the rate characteristics in primary frequency regulation to improve the power system frequency regulation capability and performance. By analyzing the charge or discharge rate characteristics of BESS, combined with the equivalent conversion method of the action time at different rates, the capacity optimization configuration method of BESS for frequency regulation considering the rate characteristic is proposed. Taking typical peak load working condition of a certain power grid as an example, the capacity configuration of three batteries (BESS 1, BESS 2 and BESS 3) considering the rate characteristics under different control methods is compared and analyzed. The results show that rate characteristics take most advantages of the corresponding control method and the high rate battery, and BESS requires a much lower capacity configuration for the same effect in grid frequency regulation. This indicates that the proposed optimal configuration method for BESS considering rate characteristics in frequency regulation can effectively reduce the configuration capacity, and this helps to realize the economic potential of BESS.