小功率非隔离型单开关双Buck型三端口变换器.doc


小功率非隔离型单开关双 Buck 型三端口变
换器#
文刚,陈宇,康勇**
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(华中科技大学强电磁工程与新技术国家重点实验室,华中科技大学电气学院,武汉
430074)
摘要:本文介绍了一种适用于小功率非隔离应用场合的新型双 buck 型三端口变换器,该变
换器用单个功率开关控制两路 buck 电路独立运行,可用于可再生能源系统中,连接新能
源、储能元件及负载,且具有以下优点:(1)仅包含一个功率开关,可省去复杂的驱动电
路与散热系统,电路成本低;(2)通过控制开关器件的占空比和开关频率实现三端口之间
的能量流动,控制电路简单;(3)电源与负载之间存在直接的能量转移通路,储能元件只
需平衡差额能量,储能元件的使用寿命得到延长。本文介绍了所提变换器的电路结构、工
作模式及参数设计方法,给出了适用的变带宽滑模控制策略,并在此基础上分析了能量管
理策略。最后通过实验结果证明以上论述的正确性。
关键词:三端口变换器;可再生能源系统;能量管理;滑模控制
中图分类号:
Low Power Non-isolated Single-Switch Double Buck
Three-Port Converter
WEN Gang, CHEN Yu, KANG Yong
(State Key Laboratory of Adwanced ic Engineering Technology (AEET) also
School of Electrical and Electronic Engineering (SEEE), Huazhong University of Science &
technology, Wuhan 430074)
Abstract: A new double buck three-port converter using in low power non-isolated application is
presented in this paper. This new converter uses one power switch to control two buck circuits
working independently, and can be used in the renewable energy systems to connect the new
energy resource, energy storage element and load. The attractive features are: (1) only have one
power switch, so the drive circuits are simple, the cooling system is small, and the cost of the
device is low; (2) the duty cycle and switching frequency are utilized for balancing the energy
among the three ports, and control circu