Control strategy of battery energy storage system to participate in the second frequency regulation

BESS (Battery Energy Storage System) has a series of characteristics, i.e. fast response, high creep speed, accurate power control, and so on. Controlling the charge and discharge power of large-scale BESS can effectively adjust the power system frequency. In this paper, the traditional unit is compared with the BESS in technology and economy respectively, and the control strategy of BESS´ participation in the second frequency regulation of power grid is proposed. In the second frequency regulation, the integral element is introduced in the traditional droop control to realize the zero-error regulation. The value of the integral coefficient is determined according to the quantity of the load change. At last, the simulation case is carried out to verify the efficiency of the proposed strategy.