复合电源系统电动车仿真研究

发布时间：2018-05-28 22:09

本文选题：电动汽车 + 复合电源系统　；参考：《北京工业大学》2016年硕士论文

【摘要】：近年来,随着全球环境及能源状况日益严峻,新能源汽车特别是电动汽车成为人们关注的焦点。其中车用动力蓄电池是电动车辆性能指标及续航能力的决定性因素,但目前车用动力电池普遍存在“充得慢,跑不远”等现象,一定程度上制约了电动汽车的发展和普及。所以,在现阶段单一电源无法满足电动汽车能量需求的背景下,发展复合能源成为解决上述问题较为有效的途径。本文以一辆微型复合电源系统试验平台车为研究对象,分别对其复合电源系统建模、功率分配控制策略、整车仿真及硬件台架搭建等方面进行讨论分析,并结合单一电源系统,研究复合电源对整车性能的改善效果。首先,本文对复合电源系统中蓄电池、超级电容及DC/DC变换器的工作特性进行分析,并基于等效电路及ADVISOR仿真模型对其原理进行讨论,通过仿真结果分析模型的准确性;之后搭建复合电源系统Simulink仿真模型,为复合电源系统整车仿真奠定基础。其次,对复合电源系统基于逻辑门限值控制策略和基于车速的功率分配控制策略控制原理进行分析,并针对两种功率分配控制策略建立Simulink仿真模型,通过多种工况检验其功率分配效果,并确定本文采用基于逻辑门限值控制策略对复合电源系统进行功率分配。再次,利用试验平台车辆实际参数对复合电源系统进行参数匹配,基于复合电源系统原理分析结果及功率分配控制策略,结合多种道路循环工况进行整车仿真研究,并将仿真结果与单一电源系统进行比较。实验结果表明,超级电容能有效发挥“削峰填谷”的作用保护蓄电池,避免大功率充放电造成蓄电池循环寿命降低;同时复合电源系统能量消耗明显降低,从而提高了整车行驶效率。最后,基于参数匹配及整车仿真结果,对车辆关键子系统进行设计和选型,并完成四轮独立驱动试验平台车的搭建工作。
[Abstract]:In recent years, with the increasingly severe global environment and energy situation, new energy vehicles, especially electric vehicles, have become the focus of attention. The vehicle battery is the decisive factor of the performance index and the capability of the electric vehicle, but at present, the phenomenon of "filling slowly, running not far" and so on generally exists, which restricts the development and popularization of electric vehicle to a certain extent. Therefore, under the background that the single power supply can not meet the energy requirements of electric vehicles at present, the development of composite energy becomes a more effective way to solve the above problems. This paper takes a miniature compound power supply system test platform as the research object, discusses and analyzes its compound power system modeling, power distribution control strategy, vehicle simulation and hardware bench building respectively, and combines with a single power supply system. The improvement effect of compound power supply on vehicle performance is studied. Firstly, the working characteristics of battery, super capacitor and DC/DC converter in composite power system are analyzed, and the principle is discussed based on equivalent circuit and ADVISOR simulation model, and the accuracy of the model is analyzed by simulation results. Then the Simulink simulation model of the compound power supply system is built, which lays a foundation for the vehicle simulation of the compound power supply system. Secondly, the control principle of power distribution control strategy based on logic threshold and speed is analyzed, and the Simulink simulation model is established for two power allocation control strategies. The power distribution effect is tested by a variety of working conditions, and it is determined that the power distribution of the composite power supply system is based on the logic threshold control strategy in this paper. Thirdly, the actual vehicle parameters of the test platform are used to match the parameters of the composite power supply system. Based on the analysis results of the principle of the composite power supply system and the power distribution control strategy, combined with various road cycle conditions, the vehicle simulation research is carried out. The simulation results are compared with the single power supply system. The experimental results show that the super capacitor can effectively protect the battery by "cutting the peak and filling the valley" to avoid the cycle life of the battery due to the high power charge and discharge, and the energy consumption of the composite power supply system is obviously reduced. Thus, the driving efficiency of the whole vehicle is improved. Finally, based on the parameter matching and vehicle simulation results, the key subsystems of the vehicle are designed and selected, and the construction of the four-wheel independent driving test platform is completed.
【学位授予单位】：北京工业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U469.72

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