Abstract:Integrating distributed energy storage （DES） into the distribution network can effectively address the issue of supply-demand imbalance，but the cost of energy storage limits its large-scale adoption and application. To optimize the energy storage configuration，a DES configuration method based on bi-level optimization model is proposed. Firstly，considering of the coupling of DES planning and operation，taking the annual operating cost of the DES system as the optimization objective，and combining the constraints of DES deployment location and the charging state，a multi-objective nonlinear integer programming bi-level optimization model is proposed. Subsequently，the particle swarm optimization algorithm is applied to promote the configuration position of DES，connection power and capacity. The day-ahead operational strategy for the energy storage system is optimized by the incorporating time-of-use electricity pricing，the optimal configuration and operation strategy for DES are derived using the CPLEX solver. Finally，a simulation analysis is carried out through the IEEE 33-node distribution network system，and the simulation results verify the effectiveness of the proposed model and algorithm.