Research On Coordinated Operation Of Electric Vehicles And Multi-microgrid Based On Blockchain Technology

The rapid development of the electric vehicle industry in recent years is very suitable for the economic transformation advocated today-a low-carbon and green economy.Therefore,in the eyes of governments,the electric vehicle industry is a development industry that deserves support and promotion.However,for the power grid,the electric vehicle charged into the grid is equivalent to an additional load,and the larger the scale,the greater the load,which has a certain impact on the stability and safety of the system operation,and may further threaten.From other perspectives,from the current people’s use of fossil energy,the use of simple electric vehicles,that is,when charging electric vehicles in the network,has not reduced the use of fossil energy,nor has it been able to reduce people’s dependence on them.Renewable energy is the main energy source of microgrids in today’s energy Internet,and because of its advantages of flexible control and rapid adjustment,it is used as a tough system support and excellent background,which is especially prominent when electric vehicles are connected to the system on a large scale.Therefore,in this paper,considering the problem of large-scale electric vehicles connecting to the microgrid and causing the load fluctuation of the microgrid,this paper studies the coordinated operation scheme between electric vehicles and multi-microgrids from the perspective of safe and economic operation of the microgrid.The main research contents are as follows:（1）Research on the prediction of dispatchable capacity of electric vehicles.Firstly,consider the charging and discharging time in this prediction model relative to the information of other electric vehicles is more important,so with it as a reference basis,establish an electric vehicle model,and study the user demand response problem,for electric vehicles,consider their responsiveness,and build its demand response model;Secondly,the dual characteristics of storage and load are the fundamentals of electric vehicles that can respond to microgrid dispatch,and then guide them to participate in the coordinated operation of microgrids,count their ability to participate in microgrid operation capacity,and design a scheme that predicts the dispatchable capacity of electric vehicles;Finally,in order for users to actively respond to the optimal dispatch of microgrid,the corresponding incentive means are to be available,and the electricity price is the focus of the user’s attention,so consider the problem of the electricity price when the user is charged and discharged,establish a virtual electricity price model,and conduct a comparative simulation analysis of the above prediction scheme to verify the superiority of the scheme.（2）Research on economic dispatching strategy of microgrid.First,consider the main micro-source output forms of today’s microgrids and the storage characteristics of electric vehicles to establish a basic model of microgrids;Then consider the uncertain situation in the microgrid,including the diversity of renewable energy output and user load,and establish a renewable energy and load forecasting model;Finally,on the basis of the above model,design a strategy,the strategy takes the microgrid as the optimization body,with its lowest operating cost as the goal,in order to achieve the economic operation of the microgrid,which can reduce the cost of the microgrid.The above strategies are solved,the solution method is improved particle swarm algorithm,and the simulation analysis verifies the feasibility of the economic scheduling strategy.（3）A collaborative optimization method for charging and discharging electric vehicles and economic dispatching of microgrids.On the basis of the above economic dispatching strategy,in order to achieve the purpose of electric vehicle users responding to the optimization and dispatch of the microgrid more actively,consider a collaborative optimization scheme that takes into account different subjects,one is the problem of electricity price change when the electric vehicle is charged and discharged,and the other is how the microgrid realizes economic dispatch,based on the above,the two collaborative optimization model is established,the solution method is the same as the third chapter,three kinds of simulated scenarios are established,and the simulation analysis is carried out on whether the charging and discharging price of the electric vehicle participates in the synergy.The microgrid and user costs in different scenarios are analyzed to verify the effectiveness of this collaborative optimization model.