Optimization Of BESS Locating And Sizing For The Gird With Comprehensive Consideration Of Planning And Operation

With the increasing scale of intermittent energy integration,the safe and stable operation of power grid will face more severe challenges.The battery energy storage system has the characteristics of rapid response and the ability to shift the energy in time and space,which is of great significance for realizing peak load shifting,solving the problem of blocking the section of regional power transmission and improving the utilization rate of the equipment.Therefore,how to improve the economical efficiency of the power grid by rationally configuring the grid-side energy storage system has become an important research topic.In this paper,considering the influence of charge-discharge strategy on cycle life,the optimal allocation methods of single position and multi position for grid-side energy storage are proposed respectively to achieve the optimal comprehensive benefits of the whole system.Firstly,the paper analyzes the role of energy storage system on the grid side,and expounds the impact of grid-side energy storage system on the system,intermittent energy and conventional units,and then establishes the mathematical model of battery energy storage system.On this basis,the comprehensive benefit of the energy storage system on the grid side is analyzed quantitatively.Then,aiming at the maximum comprehensive benefit of the energy storage system on the grid side,the paper establishes a single-position optimization configuration model for the energy storage facing the grid and a multi-position optimization configuration model for energy storage with comprehensive consideration of planning and operation,respectively,and realizes the locating and sizing of the energy storage system.The former considers the single-position two-stage optimization method adapted to the scheduling plan and takes the case of no energy storage as the reference,which proves that the grid can obtain positive benefits after entering the energy storage system and achieve a win-win situation.The latter is based on two-layer decision making,and the second-order cone relaxation programming method is used to quickly solve the optimal power flow.Through the analysis and comparison of the optimal allocation results of energy storage under four scenarios,the following conclusions are obtained: compared with the single position,it is more reasonable and superior to choose multi position for energy storage allocation and the comprehensive benefits.In addition,the sensitivity of the model is analyzed in terms of time-of-use power price difference and investment cost.The analysis shows that increasing time-of-use power price difference or reducing the investment cost of energy storage system can promote the allocation of energy storage to the power grid to be more economical.