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The Design Of Electric Vehicle Charging And Discharging Device Obeyed Grid Dispatch

Posted on:2014-01-27Degree:MasterType:Thesis
Country:ChinaCandidate:W SunFull Text:PDF
GTID:2252330401988807Subject:Control theory and control engineering
Abstract/Summary:PDF Full Text Request
Due to energy depletion and environment problem, electric vehicle hasbecome developing direction of automotive industry. A large amount of electricvehicles which are connected to grid are large-power loads. If they are chargingdisorderly and directly, grid would be overloaded. However, many people payattention to electric vehicle battery’s character which can be used as the movingenergy storage device gradually and widely. Connecting vehicle to grid and obeyinggrid dispatch, bidirectional power flow between vehicle and grid is realized, whichhas been hot point of recent research.Since charging device cann’t be dispatched by grid nowadays, this paper aimsat designing a bidirectional charging/discharging device which is suitable forVehicle-to-Grid(V2G) technology. The control of device depends on the userrequirements, grid dispatch requirement and the battery real-time state provided byBattery Management System (BMS), to realize bidirectional power flow betweenvehicle and grid.Firstly, this paper introduces implement of V2G technology on electric vehiclecharging/discharging management in different situations, and some technical pointsneeds to be solved, and comes up with requirements on V2G charging/dischargingdevice. Since the designed device belongs to the off-board charger, according tostandard of DC charging interface, this paper design the entire structure of device.Secondly, in order to achieve V2G, traditional charging device is improvedmainly on topological mechanism, control strategy and communication. Thetopological mechanism of this device adopts a bidirectional DC/DC circuit and abidirectional DC/AC circuit for realizing bidirectional power flow. This articleanalyzes various working modes and control stategy of device mainly. This devicecommunicates with BMS through CAN bus, and communicates with coordinatecontroller by power line.The device also designs an Ethernet interface, an RS-232interface and an RS-485interface, which are supported for extension and upgradedin the future.In order to realize intellectualization, this device adopts the dual-core chipConcerto F28M35x of TI as the core processing unit. The C28x used as control subsystem controls the charging/discharging process of vehicle, and Cortex-M3used as master subsystem controls communication process. This paper carries outboth software and hardware design,which mainly comprises power supply module,sampling module, communication module and so on. At last, a simple testingenvironment is established, and it is verified that the device can realize power linecarrier communication with coordinate controller.
Keywords/Search Tags:V2G, Charging and Discharging, F28M35, Power Line CarrierCommunication
PDF Full Text Request
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