Font Size: a A A

Capacity Optimal Configuration Of Grid Connected Microgrid Considering Electric Vehicles

Posted on:2019-01-10Degree:MasterType:Thesis
Country:ChinaCandidate:X H WuFull Text:PDF
GTID:2382330551458719Subject:Power system and its automation
Abstract/Summary:PDF Full Text Request
At present,the excessive use of fossil fuels in the world has led to a deteriorating global environment.The development of renewable clean energy such as wind power and photovoltaics is imminent.Microgrids can effectively use renewable energy sources and have attracted widespread attention from countries around the world.As an effective way to ease the energy and environmental crisis,electric vehicles have also achieved rapid development.However,on the one hand,the renewable energy output has an intermittent nature.After it is connected to the power grid,it seriously affects the safe and reliable operation of the power grid.On the other hand,the structure of China's primary energy sources determines that the electric vehicles connected to the grid cannot achieve a true sense of significance.zero emission.Therefore,it is possible to connect electric vehicles to microgrids and use renewable energy to directly charge electric vehicles.This will not only reduce the “indirect” carbon emissions of electric vehicles,but also enable local consumption of renewable energy sources and weaken the negative impact on the grid..Therefore,it is of theoretical and practical significance to study the capacity allocation of the electric vehicle to the microgrid.This article first summarizes the domestic and foreign research status of microgrid,electric vehicle charging facilities,microgrid capacity allocation,and electric vehicle access,and concludes that it is necessary and meaningful to study the capacity configuration of the electric vehicle to access the microgrid.Based on this,the working principles and mathematical models of three kinds of distributed energy sources in wind,photovoltaic,and storage batteries in the microgrid are studied.Secondly,the charging and discharging model and grid-connected scheduling strategy of electric vehicle are studied.Firstly,it outlines the advantages and disadvantages of the classification of electric vehicles,the three charging modes,and the scope of application.It determines the objectof this article—the slow charging of pure electric vehicles;then it analyzes the impact of electric vehicles on the grid and introduces the impact of electric After the main factors of vehicle charge and discharge load,the disordered charging and orderly charge and discharge loads of electric vehicles were modeled.Finally,a study was conducted to optimize the configuration of the microgrid integration structure for electric vehicles and renewable energy.Combining the current power market reforms and the profitability model of microgrids,a commercial operation model of a grid-connected microgrid-power sales company was proposed;in this model,in order to simultaneously take into account the revenue of microgrid power sales companies and the users of electric vehicles.Based on the benefits,an integrated energy dispatching strategy for electric vehicles under different management modes was designed;on this basis,a wind/light/storage capacity optimization configuration model that comprehensively considers the revenue and loss rate of the sales of microgrid power sales companies was established.Improved NSGA-? algorithm that can maintain good population diversity.Solving the effects of different management modes of electric vehicles on capacity allocation by example simulation;comparing conventional loads in a day,considering disordered charging and orderly distribution of electric vehicles.The total load under the condition of charge and discharge is analyzed to analyze the influence of disordered charging and orderly charge and discharge of electric vehicles on the load;and the optimal configuration of microgrid under the non-sequential charging mode of electric vehicles is also calculated using NSGA-? and NSGA-?,respectively.The solution verifies the superiority of improving NSGA-?.
Keywords/Search Tags:Microgrid, Charging and discharging of electric vehicles, microgrid operating model, Integrated energy scheduling strategy, Improved NSGA-?, Capacity optimization
PDF Full Text Request
Related items