Considering The Coordinated Dispatching Of Grid-connected Micro-grids Including Electric Vehicles

The human needs for the material economy continue to grow.Energy is the basis for meeting this demand.With the depletion of traditional fossil fuels and the increasing severity of environmental problems,this series of problems has become one of the major problems that the world urgently needs to solve.With the continuous development of distributed generation technologies,distributed generation technologies can not only alleviate the depletion crisis of traditional energy sources,but also reduce the pollution caused to the environment.A large number of distributed power sources directly connected to the grid will cause certain negative effects on the large power grid.Impact,such as frequency offset,voltage offset,etc.,and the micro-grid system as an effective way to integrate a variety of distributed power supply can effectively solve the related negative impact of distributed power supply directly connected to the grid.With the continuous development of battery technology and control technology,electric vehicles have gradually entered the field of vision of human beings.Due to the characteristics of“electricity to oil”,electric vehicles can ease human dependence on traditional energy sources and can also achieve zero pollution to the environment.With the advent of V2 G technology,EVs can be used as a type of energy storage device to charge and discharge electricity.Considering EVs accessing micro-grids,they can be ordered and charged and discharged by micro-grids,which can reduce the energy storage of micro-grids.The capacity allocation,to a certain extent,can also ease the power supply pressure of the large power grid.This article has modeled each power generation unit of the micro-grid,including wind power generation system,photovoltaic power generation system,micro gas turbines,and accumulators,etc.The difference in the power generation of each power generation unit in the micro-grid system has resulted in different operating costs for each power generation unit.This article divides electric vehicles into schedulable and non-schedulable private electric vehicles.Based on V2 G technology,the charging and discharging behaviors of electric vehicles are analyzed,and the daily load model of electric vehicles is established by randomly charging and orderly charging and discharging electric vehicles.The Monte Carlo method solves the model.Also need to consider the cost of the electricvehicle dispatching costs,that is set up the objective function for the micro-grid operating costs,electric vehicle scheduling costs,and micro-grid and large grid transaction costs and other costs,by considering the output constraints of the micro-grid power generating units As well as the constraint conditions of SOC state constraints of energy storage equipment,based on the scheduling strategy,the improved NSGA-II algorithm is used to optimize the calculation of the examples,and the comparison considers the economic operation of the electric vehicle and the micro-grid under consideration of the electric vehicle.Simulation analysis shows that the economic dispatching operation of the micro-grid considering electric vehicles is better.