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Research On Technologies Of Energy Management And Energy Saving For Electric Mining Truck

Posted on:2020-10-16Degree:DoctorType:Dissertation
Country:ChinaCandidate:W ZhangFull Text:PDF
GTID:1362330575478641Subject:Mechanical engineering
Abstract/Summary:PDF Full Text Request
In the face of increasingly serious energy and environmental problems,traditional fuel vehicles are being increasingly criticized for their high energy consumption and serious pollution.Compared with traditional fuel vehicles,pure electric vehicles have the advantages of high efficiency and zero emissions,and have incomparable advantages in energy conservation and environmental protection.The pure electric mining dump truck(hereinafter referred to as the pure electric mining truck)uses the battery as the energy device,which can basically meet the requirements of the driving range of the vehicle.However,batteries have much lower energy density than fuel,so pure electric mining trucks cannot squander energy like fuel trucks.In addition,the high specific power and high specific energy demand during the operation of the pure electric mining truck will have a large impact on the battery,which will reduce the battery efficiency and shorten the service life.Adding ultracapacitor to the energy system to form a battery-ultracapacitor hybrid energy storage system,which can exert different energy advantages,can simultaneously meet the specific energy and specific power demand of pure electric mining truck,reduce the impact on the battery,extend the battery life,improve the efficiency of the vehicle energy storage system and increase the driving range of pure electric mining truck.Regenerative braking is an important feature distinguishing pure electric mining trucks from traditional mining trucks.It can recover vehicle kinetic energy,improve vehicle energy utilization efficiency,and extend vehicle driving range.It can be seen that in order to realize the full utilization of the limited energy of pure electric mining truck,improve energy utilization efficiency,and extend battery life,it is of great significance to study energy management and energy saving technologies.This paper chooses pure electric mining truck hybrid energy storage system and regenerative energy recovery storage control to study its energy management and saving technologies.The specific research contents are as follows:Firstly,it introduces the research background of the subject,reviews the development history of pure electric vehicles and mining dump trucks,and the development status at home and abroad,summarizes the key technologies of pure electric vehicles,analyzes the importance of energy management and energy-saving technologies for the development of pure electric mining trucks,and studies the current research status and deficiencies.MATLAB/Simulink and ADVISOR 2002 vehicle simulation software are used as research tools.Many ADVISOR 2002 top-level files are modified to establish pure electric mining truck simulation model.Secondary development of ADVISOR 2002 is carried out to realize its hybrid energy simulation function.A variety of regenerative braking control strategies are developed based on MATLAB/Simulink platform and embed into ADVISOR 2002 to expand its function.The basic structure and working principle of pure electric mining truck are analyzed and its dynamic model is established.The hybrid energy storage system is studied and the battery and ultracapacitor model are established.The structure of DC/DC power converter is given and working principle and characteristics are analyzed.A drive cycle of pure electric mining truck is established according to the drive condition data collected by a certain mine road in China,In order to evaluate the effect of hybrid energy storage system on extending the cycle life of LiFePO4 battery,based on the existing fixed-capacity cycle life model of small-capacity LiFePO4 battery,the fixed discharge rate cycle life prediction model of large capacity LiFePO4 battery is established according to its experimental data of fixed discharge rate,and its cycle life prediction model under driving cycles is also given.In view of the deficiencies of single energy,lithium iron phosphate(LiFeP04)battery-ultracapacitor hybrid energy storage system is used.The topology structure and simulation model of hybrid energy are given,and the mass ratio and mixing ratio of the hybrid energy are matched.A rule-based hybrid energy control strategy is proposed,and a multi-objective optimization method for strategy parameters is proposed.The simulation results show that the hybrid energy can improve the energy efficiency of the vehicle,extend the cycle life of the battery,and improve the economic performance and dynamic performance of the pure electric mining truck.The structure and principle of the regenerative braking system are analyzed,and the vehicle"can provide "regenerative braking force model is established.The vehicle slope dynamics model is established.A regenerative braking priority control strategy is proposed and four regenerative braking strategies are established accordingly.Simulation results show that,for the pure electric mining truck studied,under the driving cycle established prior,the regenerative braking with the front wheel can recover more regenerative braking energy.Regenerative braking technology can reduce the energy consumption of pure electric mining truck and improve the economic performance of the whole vehicle.
Keywords/Search Tags:pure electric mining truck, energy management, hybrid energy, regenerative braking
PDF Full Text Request
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