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Research On The Pure Electric Vehicles Composite Energy Storage Regenerative Braking System

Posted on:2016-07-24Degree:MasterType:Thesis
Country:ChinaCandidate:G H SuFull Text:PDF
GTID:2272330467988155Subject:Power electronics and electric drive
Abstract/Summary:PDF Full Text Request
Vehicle is an indispensable part of modern life. But the traditional vehicleexacerbated the oil shortage and pollution of the atmosphere undoubtedly. Because theshrinking of the non-renewable energy and more serious environmental problems. It isimperative that development of the electric vehicle. However the endurance mileage ofelectric car is not ideal due to the restriction of battery technology. The problem can besolved effectively by regenerative braking system. It can be achieved that energyconservation and emissions reduction.Based on large number of references and the results of previous studies, thisdissertation analyzes the research status at home and abroad about regenerative brakingand studies the circuit structure. In motor applications, choose brushless DC motor ischosen as a drive motor by considering the requirement of electric vehicle driving and thecharacteristics of regenerative braking. This dissertation lists the mathematical model ofbrushless DC motor and analyzes the working state of the power switches in the motorcontroller under the model studies. In power applications, super capacitor is selected asthe energy storage element for braking energy. The composite energy storage iscomposed by super capacitor and lithium battery pack. In the analysis of the commondistribution strategy of regenerative braking and mechanical braking, this dissertationoptimizes and simulation demonstrates the distribution strategy by combining fuzzycontrol theory.Based on theoretical analysis and simulation verification of the whole system, thisdissertation designs the hardware and software of the experiment platform, and gives themain hardware circuit and software flow chart. Different road conditions were simulatedthrough the dynamometer. The pilot signal is simulated through brake pedal. It can bemonitoring the main parameters and real-time condition through the host computer.Finally, this dissertation set up the experimental platform and analysis theexperiment result of pure electric vehicles composite energy storage regenerative braking system. The experimental results show that the composite energy storage with supercapacitor as the energy storage element can recovery braking energy of pure electricvehicle effectively, and can satisfy the power requirement of the moment of startup andacceleration.
Keywords/Search Tags:regenerative braking, composite energy storage, brushless DC motor, fuzzycontrol, experimental platform
PDF Full Text Request
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