Reliability Evaluation Of Distribution Network Including Orderly Charging And Discharging Of Electric Vehicles And Wind/Solar/Storage Microgrid

A large number of electric vehicles and wind/light/storage microgrids are connected to the distribution network,which will affect their reliability.The output of wind power and photovoltaic power is random.As a charging load,electric vehicles are also affected by time and space factors,which will affect the reliability of power supply of the distribution network.If electric vehicles are charged disorderly in the distribution network,they may cause peaks to be added to the peaks due to the accumulation of conventional loads.Compared with disordered charging,V2 G technology can avoid the negative impact of disordered charging of electric vehicles on the distribution network.V2 G charges during the low load period of the distribution network and discharges during the peak load period;for electric vehicles and wind/light It is not only economical and environmentally friendly,but also to greatly improve the operational reliability of the distribution network.A fine electric vehicle load model can more accurately assess the impact of electric vehicle load on the reliability of the distribution network.For this reason,a travel chainbased method is proposed to simulate the time and space charging load of electric vehicles.First,the travel chain method is used to describe electric vehicles.Driving characteristics,and then using Gauss Markov to simulate the driving state of electric vehicles;on this basis,with peak and valley time-of-use electricity prices as the background,the orderly charging and discharging strategies of electric vehicles with power constraints are determined,and finally obtained by Monte Carlo simulation Electric vehicle charging and discharging load curve,constructing electric vehicle load and wind/light/storage microgrid balance operating state space model,using sequential Monte Carlo simulation method to evaluate the orderly charging and discharging of electric vehicle and wind/light/storing microgrid pairing The influence of power grid reliability: Based on the IEEE-RBTS Bus6 system,the simulation analysis of the number of electric vehicles connected,the connected location,and the impact of different capacity ratios of wind/light/storage power on the reliability of the distribution network.The main conclusions are as follows:(1)The orderly charging and discharging strategy determined in this paper can play a good role in peak shaving and valley filling;the analysis of the simulation results shows that the orderly charging and discharging of electric vehicles is compared to the orderly charging and disorderly charging connected to the distribution network The annual failure time of the load point is reduced,and the expected value of the total power supply shortage is reduced,thereby improving the reliability of the distribution network as a whole.It shows that when electric vehicles are connected to the distribution network,Compared with disorderly charging,orderly charging and discharging strategies that are reasonable in orderly charging modes can effectively improve the operational reliability of the distribution network.(2)By evaluating the location of electric vehicles connected to the microgrid and the impact of the number of accesses on the reliability of the distribution network,when the number of electric vehicles is certain,the closer the connected location is to the microgrid,the lower the reliability.When connected to the same location,as the number increases,the reliability also decreases;It shows that the reasonable access location and number of electric vehicles can improve the reliability of the distribution network.(3)When analyzing the different capacity of wind/photovoltaic/storage microgrid in a distribution network containing electric vehicles,analyze the impact on the reliability of the distribution network,and conclude that increasing the energy storage capacity can effectively smooth the peak load fluctuations and improve the distribution network.The power supply reliability of the power grid;it shows that the capacity of energy storage can directly affect the power supply reliability of the distribution network.