Research on Control Strategy Taking into Account Operational Economy of Enengy Storage System Participating Secondary Frequency Regulation of Power Grid

Abstract

At present, with the high proportion of new energy and power electronic equipment connected to the power grid, battery energy storage system (BESS) has been widely concerned as a new frequency regulation mean. Aiming at the characteristics of high energy storage capacity and power demand on the power generation side, a distributed coordinated control strategy of multiple distributed energy storage joint participation in automatic generation control (AGC) of the power grid considering the system operation economy is proposed. Firstly, the AGC dynamic model of regional power grid with distributed energy storage is established; On this basis, the operating cost model of energy storage participating in the secondary frequency regulation of the power grid is constructed; Finally, with the goal of minimizing the operating cost of energy storage frequency regulation, distributed consistency algorithm is used to coordinate the control of distributed energy storage, so as to realize the refined management of their respective output power. The simulation results show that the control strategy can give full play to the technical characteristics of different distributed energy storage, while ensuring the frequency stability of the power grid, avoiding the excessive loss of electricity in the energy storage system and realizing economic operation.