Optimal Economic Dispatch Of Microgrid With Electric Vehicles

With the exhaustion of energy resources and the increasingly serious environmental pollution,the development of renewable energy is the only way for the sustainable development of our society.Microgrid,as the main method for absorbing distributed power in an environmentally friendly way,has attracted more and more attention.At the same time,in order to ease the gradual depletion of energy and environmental pollution,electric vehicles gradually replace the internal combustion engine cars,has won a large-scale popularization.In the condition of meeting the load demand and a variety of constraints,economic dispatch is implemented to coordinate the power outputs and decrease the system operating costs to the minimum.Because of the diversity of the distributed generation units in the microgrid,the generation cost is not the same.So it is necessary to carry out the economic dispatch of the generating units in the microgrid system.When the electric vehicle is involved in the microgrid,the disordered charging and discharging will bring obvious adverse effects on the safe and economic operation of the microgrid.Therefore,it is necessary to study the access of large-scale electric vehicle to micro grid and establish a good scheduling strategy,which makes the microgrid and electric vehicle users beneficial.Based on the microgrid containing wind turbine,photovoltaic cells,batteries and gas turbines,this paper established the objective function whose aim is minimizing the total cost of operation cost,fuel cost,dispatch cost of electric vehicle and power transaction cost.Considering microgrid power constraint of each unit,the power constraints of electric car and battery,the electric vehicles are classified into schedulable electric vehicles and private electric vehicles.Time charge method and Monte Carlo simulation method are used to calculate the total charging and discharging power of electric vehicles in a day.Finally,the moth catching flame optimization algorithm is used to optimize the power output per hour for gas turbine.The operation cost in a day for microgrids containing electric vehicles and the ones without electric vehicles are compared.The results of numerical examples show that the microgrid with electric vehicles is more economical than that without electric vehicles.