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Research On Energy Management And Test Of Hybrid Powertrain System Combined Lithium Battery And Super Capacitor

Posted on:2017-07-07Degree:MasterType:Thesis
Country:ChinaCandidate:Y ZhengFull Text:PDF
GTID:2382330566453464Subject:Power electronics and electric drive
Abstract/Summary:PDF Full Text Request
Significant progress in electric propulsion systems and batteries has been made since about 1970 s resulting in the design and the building of electric and hybrid vehicles having performance and utility approaching that of conventional Internal Combustion Engine Vehicles(ICEV).To meet the need of EV and HEV power system,the power source of them have been developing by a single power supply for a combination of two or more energy storage devices.Therefore,in order to research the hybrid powertrain system combined lithium battery and super capacitor,this paper carried out a project that rebuilt the hybrid system and designed the energy management tactics,the main contents are as follows:In this thesis,a hybrid power system combined lithium battery and super capacitor was proposed and designed by using the super capacitor's advantages,such as high power density and better charge and discharge properties.Firstly,the characteristics of power lithium iron phosphate and super capacitors have been analyzed systematically,then the structure of the double energy system has been optimized on the basis of a typical hybrid system;meanwhile,the key technical parameters of the dynamic system were devised,too.The vehicle model was established based on ADVISOR.An electric hybrid system model has been designed,in the model,there were something to do,that to adjust the structure of electric vehicle,to architecture the hybrid system,to set and modify the key parameters of the various components,eventually to make the vehicle perform well and reach the expected goal.The research on energy management strategy of hybrid system combined lithium battery and super capacitor has carried out.Because of the analysis of common energy control algorithm,a dual energy management strategy based on fuzzy-PID control was proposed to adjust the three parameters of traditional PID controller through real-time online.Eventually,the system not only is robust and interference-free,but also has high control accuracy and fast response rate,the ultimate goal is to make the energy management strategy of the dual energy hybrid system available.At the same time,a powertrain in the loop test bench was established based on the AC electrical dynamometer.The backward test method was designed for the powertrain test bench.Finally,an UDDS driving cycle was carried out for the test of hybrid powertrain.The test results show that: the energy management strategy worked well,just as,the charge and discharge current of lithium battery pack was restricted below the 1C,and the most current fluctuation was undertaken by the super capacitor bank,which can protect the lithium battery pack.In a word,this article took the electric-electric hybrid power system structure and energy management strategy of Li-CAP Electric Vehicle as optimization object,and proposed one kind of double energy source hybrid power system structure,and adopted power system energy management strategy based on fuzzy-PID control.Finally,the simulation results had indicated this strategy's validity,which could provide a kind of reference on the aspect of optimizing power system structure of electric vehicle,system configuration and control strategy.
Keywords/Search Tags:Lithium battery, Super capacitor, Hybrid powertrain, Energy management of hybrid powertrain, Powertrain in the loop test
PDF Full Text Request
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