Segmentation Optimization Strategy of Energy Storage System for Frequency Regulation Requirements of Regional Grid

The rapid deployment of renewable energy generation systems challenges the frequency safety of power system. Aiming at the problems faced by multi-energy storage systems when participating in secondary frequency regulation, this paper proposes a segmentation optimization strategy of energy storage system for frequency regulation requirements of regional grid. Firstly, all energy storage units are classified into three state intervals according to different health state of SOC, and then the objective functions reflecting SOC recovery and frequency regulation costs are designed respectively. By choosing appropriate objective functions in different intervals, the solution can be optimized. Simulation results prove that the proposed strategy can enable the energy storage system to meet the secondary frequency regulation needs of regional grid.