In recent years

the new energy grid-connected power generation in Mengdong area has increased rapidly

and the conventional grid structure has caused some new energy power generation to be unable to be consumed in time

leading to a problem of wind power and solar power abandoning. In this paper

the power flow calculation model of the energy storage system connected to the power grid is established

by taking the northern part of Tongliao Power Grid

namely the Zuozhong Substation—Shebotu Substation—Chengyuan Substation—Baolongshan Substation

as the research object. The improved particle swarm optimization(PSO) algorithm is used to solve the optimal installation location and capacity of the energy storage system. The simulation results show that

reasonable location and capacity configuration of the energy storage system can effectively improve the power flow distribution of the large-scale wind farms in northern Tongliao area after grid connection

thus to improve the new energy consumption capacity and relieve the peak shaving pressure of conventional thermal power units.