Distribution Network Reconstruction Method Considering Operation Optimization Of Battery Swapping Station

The rapid development of electric vehicles not only provides a greener way for modern transportation,but also provides enough profit space for battery charging and swapping station operators because of its inherent energy storage value of EV’s batteries.At the same time,the rapid growth of the charging load also put higher request on the economic and safe operation of the power grid.How to ensure the safe,reliable and economical operation of the distribution network while improving the operating efficiency of the battery swapping station operators has become a challenge for the development of smart grid technology..First of all,for analyzing the adverse impact on the local distribution network that the disordered charging load will cause,this paper uses K nearest neighbor algorithm to fit the electric vehicle travel chain data in different areas,and combining with the analysis and modeling of the operation mode of the battery swapping station,the disordered charging load in various areas can be obtained.By appling this disordered charging load to the basic load curve of the area,and further adverse impact of the different types of disordered charging load on the local distribution network can be estimated.Secondly,in view of the problem of improving the operating efficiency of the substation operator,the operating efficiency of the battery swapping station is set as the optimization target,the number of batteries in each state is set as the optimization variables,and the main constraint condition is the battery state transfer relationship determined by the travel demand of electric vehicles,then this mixed integer linear model can be establised.The model has been solved under two different battery modes(the module-split modes and the whole modes)by using Cplex.The result of an example verifies the effectiveness of the proposed orderly charging plan under bettery module-split modes in improving the operating efficiency of an battery swapping station.At the same time,this paper analyzes the influence of different electricity pricing strategies(step tariff and real-time tariff)on the operating efficiency of the battery swapping station and the local distribution network.Finally,in view of the problem of improving the economics of distribution network operation,a distribution network reconstruction model is proposed,which takes the reduction of daily network loss as the optimization objective,the number of interruption switch as the optimization variables,the power flow constraint and the topological constraint as the main constraints,and the particle swarm optimization algorithm is used to solve this non-convex nonlinear mixed integer model.By adding the charging load in each area obtained by the previous analysis to the modified 33-node test system for simulation,the result shows that the proposed distribution network reconfiguration scheme can effectively reduce the daily network loss under different permeability of charging load.