基于FPGA的超级电容器电压管理系统研究

发布时间：2018-02-12 17:05

本文关键词： FPGA 超级电容器充放电电压均衡 VGA显示　出处：《电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：超级电容器是一种新型的绿色储能器件,具有功率密度高,充放电速度快,使用寿命长等优点,在电动汽车、新能源开发等领域具有广阔的发展空间。在实际使用中,为了满足系统对电压和能量等级的需求,必须通过若干个超级电容器的串并联组合构成电容组模块。串联电容组在充放电过程中,由于各单体之间参数的离散性,会出现电压不均衡现象,这将严重影响超级电容器的使用寿命和储能效率。因此,电压均衡技术的研究对超级电容器发展具有至关重要的意义。本文针对超级电容器充放电电压不均衡的问题,在对现有均衡技术分析的基础上,提出了一种新型充放电均衡系统,该系统采用FPGA为主控制器,还包括AD模块,开关网络1和2,电压转换电路以及VGA显示模块等。AD模块采集超级电容器组中各个单体的电压数据,FPGA对采集的数据进行处理,然后控制开关网络的切换,其中,开关网络1控制中间储能器件飞渡电容器,实现能量从高电压单体到低电压单体的转移;与此同时,开关网络2控制电压转换模块输出的稳定电压,给电容组中电压最低单体进行充电。与现有均衡技术相比,由于两路均衡措施同步运行,可以达到更好的均衡效果。另外,本系统还设有VGA显示模块,便于对系统运行状态的监控,极大地提高了系统的实用性。最后,对系统的均衡效果进行实验测试,通过数据分析可以看出,采用此系统进行均衡后,在充电过程中超级电容组单体电压具有较好的一致性。本系统在充电、放电、同时充放电环节都可以应用,而且系统体积较小,可用于便携场合。与现有均衡技术相比,在单体电压差较小时,本论文设计的方案具有更好的均衡效果,从而达到延长超级电容器使用寿命的目的。
[Abstract]:Supercapacitor is a new type of green energy storage device, with the advantages of high power density, fast charge and discharge speed, long service life, etc. It has a wide development space in electric vehicles, new energy development and other fields. In order to meet the demand of voltage and energy level of the system, the series and parallel combination of several supercapacitors must be used to form the capacitor group module. Voltage imbalance will occur, which will seriously affect the service life and energy storage efficiency of supercapacitors. The study of voltage equalization technology is of great significance to the development of supercapacitors. In this paper, based on the analysis of existing equalization techniques, the charge and discharge voltage imbalance of supercapacitors is discussed. In this paper, a new charging and discharging equalization system is proposed. The system adopts FPGA as the main controller, and also includes AD module. Switching network 1 and 2, voltage conversion circuit and VGA display module. AD module collects voltage data of each unit in supercapacitor bank and then controls switching of switch network. Switching network 1 controls the intermediate energy storage device to transfer energy from high voltage unit to low voltage unit, while switching network 2 controls the output voltage of voltage conversion module. Compared with the existing equalization technology, the two equalization measures can achieve better equalization effect. In addition, the system also has a VGA display module. It is convenient to monitor the running state of the system, which greatly improves the practicability of the system. Finally, the equilibrium effect of the system is tested experimentally. Through the data analysis, it can be seen that after the system is balanced, This system can be used in charge, discharge, charge and discharge links, and the system is small and can be used for portable applications. Compared with the existing equalization technology, the system can be used in portable applications. When the cell voltage difference is small, the scheme designed in this paper has better equalization effect, thus prolonging the service life of supercapacitor.
【学位授予单位】：电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM53

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