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Research On Composite Energy Storage And Regenerative Braking System In Electric Vehicles

Posted on:2019-07-30Degree:MasterType:Thesis
Country:ChinaCandidate:Z H LiuFull Text:PDF
GTID:2382330542487760Subject:Power electronics and electric drive
Abstract/Summary:PDF Full Text Request
With the continuous innovation of the automobile manufacturing process,the sales price of the vehicle has been decreasing,more and more families choose the automobile as the necessity of the family.However,a series of issues such as automobile noise,fog and haze and greenhouse effect have become the focus of the society.Compared with fuel vehicles,electric vehicles have the advantages of low noise and zero emission,which can alleviate the problems of life,environment and resources,and become the main development targets of new energy vehicles.However,the battery as the power supply of electric vehicles,it has the disadvantages of low power,short mileage and cannot be frequently high current charge and discharge.These disadvantages have become the bottleneck of the development for electric vehicles.In this dissertation,composite energy storage device composed by the super capacitor and battery and regenerative braking technology are studied,making full use of the advantages of high specific power of super capacitor and high energy of battery,improving recovery rate of the regenerative braking energy,making the mileage and dynamic performance of electric vehicle improved.In this dissertation,the characteristic curve of the battery,super capacitor and bi-directional DC/DC converter is analyzed,studying the topological structure and working mode of the composite energy storage device,analyzing the principle of regenerative braking system,working mode and braking force distribution etc.Then the logic threshold and fuzzy control strategy is design,building the model of control strategy and vehicle simulation of composite energy storage and regenerative braking for electric vehicle in Matlab and Cruise used for electric vehicle individually,validating the system of composite energy storage and regenerative braking by road cycle conditions of China's City and Europe's NEDC.The simulation results verify the rationality and effectiveness of the control strategyof the system for composite energy storage and regenerative braking.To design the corresponding hardware and software according to the requirements of the system of composite energy storage and regenerative braking,the hardware design mainly includes digital signal processor control circuit,power conversion circuit,protection circuit of power circuit.Finally,building experimental test platform of the system of composite energy storage and regenerative braking,electric dynamometer can simulate load during the driving process of electric vehicles.The experimental results show that the system of composite energy storage and regenerative braking can improve the dynamic performance,recovery rate of power and mileage.
Keywords/Search Tags:electric vehicle, composite energy storage, regenerative braking, control strategy, experimental test platform
PDF Full Text Request
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