Research On Optimal Scheduling Strategy Of Electric Vehicle Charging And Discharging In Microgrid Environment

With the continuous development and progress of human society,the pressure of energy shortage and environmental pollution is becoming more and more great.Microgrid in which renewable energy power accounting for a larger proportion and electric vehicles which are on the vehicle power supply get more and more attention.The fluctuation of renewable energy and the randomness access of electric vehicle bring great difficulties to the power balance of microgrid.Because of electric vehicles' dual characteristics of load and energy storage unit,how to use its power battery to serve microgrid becomes hot spots of domestic and abroad research.On the basis of in-depth study of the impact of renewable energy and electric vehicles on microgrid,the optimization scheduling method of electric vehicle charging and discharging is proposed,which can provide an effective solution for the large-scale application of renewable energy and electric vehicles in microgrid environment.In order to absorb renewable energy and reduce the equivalent load fluctuation variance,optimization scheduling strategy of electric vehicles charging and discharging is put forward m which collaborative optimization of electric vehicles and renewable energy sources.The proposed algorithm takes the minimum equivalent load peak valley difference as the objective function,and considers the constraint of the electric vehicle charge,the charging and discharging cycle.The model is considered as a dynamic programming problem,and adopt CPLEX/YALMIP optimizer to solve.The proposed algorithm can effectively reduce the consumption of renewable energy,the peak and valley load difference.Electric vehicles access to the microgrid will cause the phenomenon of peak on peak,in order to ensure the safe and efficient operation of the microgrid,an optimal scheduling strategy for charging and discharging of electric vehicles with the consideration of the operation cost is proposed.The proposed algorithm takes the minimum of the cost of fuel,operation and maintenance cost,the cost of pollutant emission reduction and peak valley difference as the objective function,and consider the power balance of power system,the minimum start-off time constraint,the upper and lower bounds of power output,the electric vehicle charging and discharging power constraints,etc,based on piecewise linear cost curve of micro power,by the CPLEX/YALMIP optimizer to solve,the charging and discharging scheduling method electric vehicle is obtained.The proposed method can effectively solve the problem of peak to peak caused by random access of the electric vehicle in the microgrid,and gives full play to the economic benefits of the microgrid,environmental benefits,and provides a solution for the large-scale application of electric vehicles in the microgrid environment.