Research On Day-ahead Optimal Dispatching Method Of Distribution Network Considering Fast Charging Station With Photovoltaic And Energy Storage

As a type of transportation that uses clean energy,electric vehicles are being more and more widely used around the world.With the increase of the number of electric vehicles in the road traffic network,the charging demand of electric vehicles is increasing,and the access of a large number of charging stations has an impact on the safe operation of the power grid.Compared with the slow charging load,the fast charging load has the characteristics of higher instantaneous power and shorter duration,which increases the difficulty of grid regulation.Therefore,how to evaluate the fast charge demand in the region has become a focus of this study.On the other hand,in order to reduce the impact of the fast charging load on the safe operation of the distribution network,based on the modeling of fast charging,the research on the optimal scheduling of the distribution network of the fast charging power station with photovoltaic and energy storage battery is carried out.The main work of this article is as follows:1)A modeling method for fast charging of electric vehicles is proposed.According to the regional traffic road model,considering the types of electric vehicles and driving energy consumption,the "vehicle-road-station" information interaction system is used to plan the travel path and charging place for the electric vehicle users,and the cellular automata model is introduced to simulate the driving situation of electric vehicles on the road in detail.Finally,the scene analysis method is used to obtain the typical scenes of the charging load of each fast charging station in a 13-node road network area,and the effectiveness of the proposed method is verified.2)In view of the possible negative influence of fast charging load on the operation of distribution network,photovoltaic and energy storage battery are introduced into the charging station to reduce the impact of fast charging load on site,and a stochastic/robust hybrid optimal scheduling method is proposed for the distribution network.Taking the minimum operating cost of the distribution network as the objective function,considering the uncertainty of the fast charging load of the electric vehicle,the conventional load of the distribution network and the photovoltaic output,based on the second-order cone relaxation and strong duality theory,a stochastic/robust hybrid optimal dispatching model is built for the distribution network considering fast charging station with photovoltaic and energy storage to realize the scheduling decision of the energy storage system in the charging station under stochastic uncertain scenarios and thereby improving the reliability and economy of the distribution network operation.Finally,the effectiveness of the proposed method is verified in a 13-node network and the improved ieee-33 node distribution system coupling network.