基于半桥变换器和倍压器的超级电容均压策略  

Voltage balancing strategy based on half-bridge inverter and voltage multiplier for supercapacitor

作　　者：汪玉凤[1] 周宏胭[1] 颜廷武[2] 王旭生[1] 

机构地区：[1]辽宁工程技术大学电气与控制工程学院,辽宁葫芦岛125105 [2]辽宁省电力有限公司阜新供电公司,辽宁阜新123000

出　　处：《电工电能新技术》2015年第1期17-22,61,共7页Advanced Technology of Electrical Engineering and Energy

基　　金：辽宁省创新团队基金(2008T079)资助项目

摘　　要：串联超级电容器组中的单体电压不均衡会降低电容器的储存能量,缩短其使用寿命。传统的电压均衡方法电路拓扑结构复杂,开关器件和磁性元件数量较多,体积较大。鉴于这些不足之处,本文采用一种基于半桥变换器和倍压器组合的电压均衡策略,该策略可以自动地均衡超级电容器的电压,电路结构简单,且开关频率和占空比恒定,不需要反馈控制环节。本文介绍了超级电容器电压均衡模型及其工作原理,并利用推导的直流等效电路分析了电压均衡原理。仿真及实验测试结果表明:该均压策略具有均压速度快的优点,并且可以明显提高系统的能量转换效率。Cell voltage imbalance of series-connected supercapacitor strings can decrease the energy storage level ofthe capacitors and shorten its service life. The circuit topologies of traditional voltage balancing methods are complex,and require a number of switching devices and magnetic components,so its size tends to increase. In view of these deficiencies,a voltage balancing strategy is proposed in this paper,which is based on the combination of a half-bridge inverter and a voltage multiplier that can automatically balance the voltage of capacitors,and the circuit structure is simple. Furthermore,feedback control can be eliminated when the system is operated with a fixed switching frequency and duty ratio. The supercapacitor voltage balancing model and its working principle are introduced,and the voltage balancing principle is analyzed with the derived dc equivalent circuit. The simulation and experimental results show that the proposed strategy has the advantage of fast equalization speed and can improve the power conversion efficiency of the system obviously.

关 键 词：电压均衡 半桥变换器 倍压器 超级电容 

分 类 号：TM53[电气工程—电器]