考虑配电网结构演化的光储充柔性互联规划方法OA

With the continuous popularization of electric vehicles(EVs),fast charging stations(FCSs)integrated with photovoltaic and energy storage gradually become an important load type of the distribution network.The operation status of integrated FCSs with photovoltaic energy storage and charging will affect the operation status of the distribution network.Aiming at the problem of the distribution network,this paper realizes the adjustment of the power flow distribution of the distribution network through flexible interconnection in cooperation with energy storage.And a flexible interconnection planning method is proposed for photovoltaic,energy storage and charging considering the structural evolution of the distribution network.This method realizes the planning in two layers.The upper layer realizes the simulation of the structural evolution of the distribution network based on Monte Carlo simulation.And the lower layer realizes the planning of the flexible interconnection device with the operation cost of the distribution network as the optimization objective.Firstly,taking the FCS,energy storage(ES)and soft open point(SOP)as the research objects,a charging load model of the FCS,a charging and discharging model of the energy storage,and a power interaction model of the SOP interconnection device are established.Secondly,considering the load demand of the distribution network,a probability model of the structural evolution of the distribution network based on the node degree and the connection distance is constructed.Thirdly,an SOP flexible interconnection planning model with the operation cost of the distribution network as the optimization objective is established.Then a two-layer solution algorithm is constructed.The upper-layer algorithm realizes the simulation of the structural evolution of the distribution network based on Monte Carlo simulation,so as to determine the evolution structure of the distribution network.The lower-layer algorithm makes a plan for the flexible interconnection location of the SOP based on the upper-layer evolution structure,taking into account the charging load,the charging and discharging conditions of the energy storage,and the power interaction conditions of the SOP.Finally,the method proposed in this paper is verified based on the 33-node system.The simulation results show that when the proposed method in this paper is adopted,the operation cost,active power loss and voltage violation situation of the distribution network are improved.