Research On Converter And Schedule Control Technology For Electric Vehicles Charge-discharge

With the increasingly serious global oil shortage and environmental pollution, electricvehicles(EVs) will eventually become the inevitable development tendency of future cars, itinspired V2G, which is a technology of transfering energy between EVs and the power grid.However, when a large-scale EVs are beening charged and discharged from the grid, Grid willdefinitely be a huge impact, the converter technology and schedulecontrol strategies EVscharge-discharge will directly affect the massive popularity and reliable implementation ofV2G technology. Therefore, it is vital importance for the promotion of V2G technology thatstudying converter technology and control strategies of electric vehicles charge-discharge.At first,it introduces the research background and significance of V2G technology andoutlines the history of the development and status of V2G development of domestic andforeign in the paper.Then it’s present that a simple structure only for charging at the beginning of Evsdevelopment,which is called single-phase three-level rectifier. This structure was used doubleclosed-loop control strategy, and the outer loop is voltage control, the inner loop was usedhysteresis comparator. The voltage loop adopted ANFIS control strategy,it do well in thematter of stabilize DC voltage fluctuations and enhancing antijamming capability. Besides, Bytheoretical analysis, there is compensation design on the midpoint potential difference value.the simple SPWM modulation is used for switch modulating, and the superiority of thestructure and its control methods was verified.Then,aim at the development stage of Evs can exchange with grid, a bidirectionalconverter structure was put forward, it based on the first structure.For the bidirectionalconverter structure, a more sophisticated method of impulse control(SVPWM) is used, adouble hysteresis comparator is proposed to control the inner current loop. According to thesize of current error of the hysteresis comparator, the output of hysteresis comparator presentfour states, Combining the area of the voltage vector calculated by electromotive force andcurrent discretization prediction, the best switch output vector could be choosed,So thecurrent error can been quickly controlled within a range of the system requirements. it wasalso verified the superiority of the bidirectional converter structure and its control methods.Finally, it do research for the timing control issues of V2G. First it was established thatthe state model of vehicle and improve the thorough time-sharing electricity price structure,and build complete battery loss cost model, then the improved ant colony algorithm was used to optimize the user’s charge and discharge cost, reduced cost of battery life loss and gentlyreal-time load fluctuations, and to find the best path for timing control of a single vehiclecharge-discharge. In the simulation experiments, four kinds of car were refered, Results verifythe feasibility of the aco algorithm for the timing control model of the group of EVscharge-discharge.