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Research On Control Strategy And Harmonic Characteristics Of Charging And Discharging System Of Electric Vehicle Based On V2G

Posted on:2019-05-23Degree:MasterType:Thesis
Country:ChinaCandidate:X G YinFull Text:PDF
GTID:2392330578472625Subject:Power system and its automation
Abstract/Summary:PDF Full Text Request
With the continuous prosperity of global industrialization,energy crisis and environmental pollution are becoming more and more serious,which has become the focus of attention of all mankind.As a clean and environmentally friendly vehicle,the widespread application of electric vehicles can effectively promote the development of low-carbon transportation.The technology of V2G(Vehicle to Grid,V2G),which combines the power Grid and electric vehicles is the focus of the future development of electric vehicle technology,therefore,the charging and discharging system of electric vehicle which can realize the two-way flow of electric energy between power grid and electric vehicle is becoming a hot spot of research.In this thesis,the significance of realizing V2G technology is introduced,and the importance of studying the charging and discharging system of electric vehicle is emphasized,the main circuit of charging and discharging system of electric vehicle and its working principle are introduced in detail.The system control strategy involved in the charging and discharging process of electric vehicle is studied and designed emphatically,which provides sufficient theoretical support for the subsequent simulation experiment.The simulation model of the charging and discharging system of the electric vehicle is built in the PSCAD/EMTDC software,and the specific working characteristics of the electric vehicle under different charging and discharging modes are simulated.Finally,on the basis of the equivalent simplification of the charging system of electric vehicle,the harmonic characteristics in the network side current are compared and analyzed when the electric vehicle is charged through the different types of charger;According to the principle of dq0 harmonic detection,a low harmonic content PWM charger is designed by improving the control system of PWM converter.The simulation results show that the whole control system designed in this thesis can effectively accomplish the control task and realize the two-way flow of electric energy between the power grid and the electric vehicle,the harmonic characteristics in the network side current are obtained when the electric vehicle is charged through the different types of charger,and the feasibility of the low harmonic content PWM charger is verified.
Keywords/Search Tags:Electric vehicle, V2G, PSCAD/EMTDC, charging and discharging control strategy, harmonic characteristics
PDF Full Text Request
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