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Research On Charging And Discharging Control Strategy Of Electric Vehicles And The Coordination With Wind And Photovoltaic Energy

Posted on:2017-03-31Degree:MasterType:Thesis
Country:ChinaCandidate:X T FanFull Text:PDF
GTID:2382330596457187Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
The development and application of the smart grid and the energy internet has enabled the electric vehicle not only to be used as a load to meet the owner's driving,but also can be used as energy storage unit for two-way interaction with the power grid of energy and information.Based on this,this paper takes electric vehicles interaction with power grid as the main research content,analysis electric vehicles charge and discharge model and coordination and optimization control strategy with wind and photovoltaic energy.Firstly,a charge/discharge model of a two-stage electric vehicle composed of a PWM converter and a bidirectional DC/DC converter based on LCL filter is proposed and establised.LCL filter can be a smaller filter inductance to achieve a better filtering effect.Electric vehicle charging using constant current and then constant voltage method and discharging using constant current method.LCL filter under some high-frequency input signal in the charge-discharge process can produce resonance spikes,leading to system instability.In order to suppress the resonance spike,an active damping control strategy is adopted on the PWM converter side and the bidirectional DC/DC converter side,respectively.In order to verify the correctness and superiority of the established model and its control strategy,simulation analysis is carried out in Matlab/Simulink.Secondly,in order to coordinate and optimizate with wind and photovoltaic energy under improve user response,Large-scale decentralization of electric vehicles interact with the power grid is need the intelligent management for its charge and discharge behavior.The different control methods of electric vehicles are compared and analyzed,and it is proposed that the intelligent control of electric vehicles can be taken into account by the hierarchical control strategy,which can fully consider the demand of power grid and electric vehicle owners,and achieve better coordination and optimization results.Finally,the grid control center and agent charging and discharging station are researched in the hierarchical zoning control.the grid control center makes the coordination and optimization model of electric vehicle charging and discharging with wind and photovoltaic energy.In order to minimize the actual load/output with dispatch deviation of the electric vehicle,the agent charging and discharging station sets up the evaluation system of charge and discharge priority of the electric vehicle,charge-discharge sequence and charge-discharge power of electric vehicle.The simulation results show that the reasonable electric vehicle charging and discharging control can not only stabilize the load fluctuation of the power grid,enhance the ability of the power system to accept the wind and photovoltaic energy,but also increase the profit of electric vehicle users,improve interactive response initiative.
Keywords/Search Tags:Electric vehicle, Charging and discharging model, Hierarchical partition, Network control center, Agent charging and discharging station
PDF Full Text Request
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