Electric Vehicle Ordered Charging And Discharging Strategy Based On The Demand Side Response

At present,the continuous development of the global economy has also brought about the problem of energy shortages and environmental pollution,and the energy used is mainly non-renewable fossil energy.Therefore,the transformation of energy structure cannot be delayed,and it is urgent to develop and utilize new energy sources.The problem of exhaust emissions from traditional fuel vehicles should not be ignored,and electric vehicles have become the development direction of automobile industry in the future because of its low energy consumption and low pollution.Electric vehicles have not been widely used in our country,and the planning and construction of electric power supply facilities matched with electric vehicles have a greater impact on the development of electric vehicles.Therefore,the construction of reasonable,efficient and convenient electric power supply facilities for electric vehicles is conducive to the application of electric vehicles.At the same time,When large-scale electric vehicles are randomly connected to the grid for charging,it will adversely affect the operation of the power system,resulting in a phenomenon of “peak peaking” in the system load.As the vehicle to Grid(V2G)technology matures,it can be regarded as a special energy storage,as a buffer for the grid and renewable energy,reverse power transmission to the grid,participate in peak-shaving of power system and so on.Therefore,firstly,this thesis studies the planning of electric vehicle power supply facilities,determines the location of charging and switching stations,then considers the disorderly charging of electric vehicles at charging stations,and analyses the adverse impact of disorderly charging on the system load.Finally,in order to improve this adverse impact,an orderly charging and discharging strategy is proposed to rationally regulate the charging and discharging behavior of electric vehicles.In the planning of charging and switching power stations for electric vehicles,based on the prediction of the number of electric vehicles in the planned area,combined with the date of driving characteristics of electric vehicles,the total switching demand of electric vehicles is calculated,and the joint planning model for charging and switching power stations are established,which is solved by weighted Voronoi diagram and adaptive particle swarm optimization algorithm.The results of the example show that the scale result satisfies the power supply demand of users,and at the same time,the average annual comprehensive cost of the charging and switching stations is optimized.Aiming at the influence of disorderly charging of electric vehicles on the power grid,the factors affecting the charging load are determined,including battery characteristics and user behavior characteristics,research on the disorderly charging of vehicles in charging stations,the mathematical model of disorderly charging is established and solved by Monte Carlo method.The example shows that when the electric vehicle is connected to the grid through the charging station in the disordered state,it will increase the peak-valley difference of load,aggravate the fluctuation of load curve,and affect the safe and stable operation of power grid.In terms of orderly charging and discharging of electric vehicles,the main types of demand response are analyzed.The time-of-use price in price-based demand response is selected.The method of setting up the upper and lower limits of charging and discharging prices for electric vehicles is studied.The model is established to optimize the charging and discharging period,and use the NSGA-II algorithm to solve the model.The example shows that under the guidance strategy of price-demand side response,it can effectively realize the “peak-shaving and valley-filling” of power system load and ensure the user’s participation in V2 G revenue.