标题: | 燃料电池供电系统之双锂电池充电效率控制 On Charging Efficiency of Dual Li-Ion Batteries for Fuel-Cell Electricity System |
作者: | 叶展嘉 Chan-Chia Yeh 董兰荣 Lan-Rong Dung 电控工程研究所 |
关键字: | 直接甲醇燃料电池;锂电池;直流转换器;数位控制;浓度控制;混合;DMFC;Li-Ion Battery;DC-DC;digital control;fuel sensor-less control;hybrid |
公开日期: | 2008 |
摘要: | 有别于传统之串联式与并联式架构锂电池使用寿命过短之议题,本论文提出一新颖的燃料电池与双锂电池混合供电系统。本系统之最大特色是采取双锂电池交互供电策略,一个锂电池专司负载放电,另一接受燃料电池电力充电,如此可避免锂电池在传统架构上遭受过充与过放使寿命减短之伤害。 本架构并结合燃料电池浓度控制、最大功率点追踪与高效率动态电流充电成一完整系统。利用最大功率点追踪电路结合脉冲响应燃料注入法,可将燃料槽之甲醇浓度准确的维持在一定值,并且不受温度等环境因子影响;高效率动态电流充电则可使锂电池有较快的充电速度与充电效率。此外,配合燃料电池在不同温度下最大输出功率之变化,本系统亦综合考量燃料电池在不同的电力供应能力下之负载平衡议题,提出合理的演算机制。 本论文另将类比控制器参数全数位化,采用数位控制器达成上述之演算法与电路机制,以求未来实作上将有机会进一步缩小控制器体积。并透过模拟软体,编辑C语言以实现数位逻辑运算功能,给予电路模型合理的控制命令。最后的模拟结果显示,在不同温度下此混合供电系统均可符合演算法预期之运作机制,可证明此燃料电池与双锂电池混合供电系统在实作上确实可行。 One of the important issues in traditional parallel and series structure of hybrid fuel cell/Li-Ion battery power supply is the battery life too short to use. In this paper, we propose a novel hybrid system that combines dual Li-Ion batteries with a fuel cell to deal with these issues. The control strategy presented in this paper is able to track the maximum power point of the fuel cell, sustain the fuel concentration in mixing tank and regulate the charginging current of the Li-Ion battery.The controller parameters are designed by discretization of analog controller. It will be easier to implement computational functions and more flexible in modifying the code for other applications. Simulating results present the feasibility and generality of the control strategies. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT079512521 http://hdl.handle.net/11536/41078 |
显示于类别: | Thesis |