Research on Optimal Scheduling Method of Hybrid Energy Storage System Considering Health State of Echelon-Use Lithium-Ion Battery

In order to effectively improve the role of battery energy storage system in power system, this paper studies the optimal scheduling strategy of BESS in power grid. Firstly, taking the minimum power exchange cost between power grid and the penalty cost of node voltage deviation as the objective function, an optimal scheduling model of BESS in distribution grid based on mixed integer programming is proposed. Secondly, when BESS tracks the scheduling instruction, the life attenuation of each BESS is inconsistent due to the difference of operation conditions. A scheduling method considering the state of health (SOH) of BESS is proposed. Finally, the SOC and total charge and discharge capacity of each BESS are analyzed, and the change characteristics of SOC under different SOH conditions (0.8, 0.85, 0.9, 0.95, 1.0) are verified effectively, which indirectly verifies that this scheduling method can effectively reduce the scheduling loss.