Optimal Operation Strategy of Battery Energy Storage System in Distribution Networks With Consideration of Power Losses

Generally the peak load shifting is regarded as the optimization objective for the operation of battery energy storage system(BESS) connected to distribution network,on this basis the network loss reduction is also taken into account in this paper.Based on the radial structure of distribution network a simplified network loss computing method is designed so as to establish an optimal operation model of BESS.Utilizing the operational features of BESS,the established model is solved by bi-level optimization.In the outer layer the genetic algorithm(GA) is utilized to optimize the charging/discharging states of BESS,while in the inner layer the quadratic programming(QP) is employed to measure individual fitness of GA used in outer layer,thus the optimal charging and discharging states under specified conditions can be obtained.During the case study,the influences of network-connected position of BESS and its operational scheme under load curve with different characteristics on network loss are analyzed,and the optimization results under different charging/discharging times within the research period are compared.The simulation results show that the proposed method is also applicable to make medium/long term optimal operation strategy of BESS.