电工技术学报  2021, Vol. 36 Issue (23): 5014-5026    DOI: 10.19595/j.cnki.1000-6753.tces.200963
电力电子 |
三端口隔离DC-DC变换器软开关特性
余雪萍, 涂春鸣, 肖凡, 刘贝, 郭祺
湖南大学国家电能变换与控制工程技术研究中心 长沙 410082
Soft Switching Characteristics of the Three-Port Isolated DC-DC Converter
Yu Xueping, Tu Chunming, Xiao Fan, Liu Bei, Guo Qi
National Electric Power Conversion and Control Engineering Technology Research Center Hunan University Changsha 410082 China
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摘要 三端口隔离三有源桥(TAB)DC-DC变换器作为新能源接入的一种积极探索与尝试,在分布式光伏接入、新能源汽车及多电压等级直流用电需求等领域得到了广泛关注。软开关能力作为TAB应用的关键优势之一,可以有效地降低开关损耗、提升变换效率。然而,由于开关管数量增多,TAB的工作模式及移相控制方法较双有源桥(DAB)DC-DC变换器出现了成倍增加的现象,现有DAB的零电压开通(ZVS)已不利于推广至TAB。该文在分析TAB工作原理的基础上,从开关管驱动信号出发,将TAB的等效电路进行了分解,构建双电源作用下电感电流的统一表达式。基于叠加定理,TAB每个开关管开通时刻的电感电流均可以由多个双方波电压源作用下的电感电流相加得到,并且不受移相控制方法的影响,计算简便。基于TAB等效电路的分解模型,该文绘制不同移相控制方法下TAB的全开关ZVS区域,并对其进行讨论分析。最后搭建实验平台,验证了该方法的可行性与有效性。
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余雪萍
涂春鸣
肖凡
刘贝
郭祺
关键词 软开关隔离式DC-DC变换器电感电流移相控制    
Abstract:As an active exploration, the triple active bridge (TAB) has been widely concerned in the fields of distributed photovoltaic access, new energy vehicles, and multi-voltage level DC power demand. Soft switching is one of the key advantages of TAB, which can effectively reduce switching loss and improve conversion efficiency. However, due to the increase in the number of switches, the working mode and phase shift control method of TAB have multiplied compared with the dual active bridge (DAB), and the existing ZVS method of DAB is not applicable to TAB. Based on the analysis of TAB working principle, the equivalent circuit of TAB is decomposed from switching signals, and the uniform expression of the inductor current under dual-power supply is constructed. According to the superposition theorem, the inductor current at the opening time of certain switch can be obtained by adding the inductor current under multiple dual-power supplies. Moreover, it is not affected by the phase shift method, and the calculation is simple. Based on the decomposition circuit model, this paper draws and analyzes the ZVS region of TAB under different phase shift control methods. Finally, an experimental platform is built to verify the feasibility and effectiveness of the proposed method.
Key wordsSoft switching    isolated DC-DC converter    inductor current    phase shift control   
收稿日期: 2020-08-01     
PACS: TM46  
基金资助:国家重点研发计划资助项目(2018YFB0904100)
通讯作者: 余雪萍 女,1990年生,博士研究生,研究方向为多端口直流变换器等。E-mail: Xuepingyu@163.com   
作者简介: 涂春鸣 男,1976年生,博士,教授,主要研究方向为电能质量与控制、电力电子技术在电力系统中的应用等。E-mail: chunming_tu@263.net
引用本文:   
余雪萍, 涂春鸣, 肖凡, 刘贝, 郭祺. 三端口隔离DC-DC变换器软开关特性[J]. 电工技术学报, 2021, 36(23): 5014-5026. Yu Xueping, Tu Chunming, Xiao Fan, Liu Bei, Guo Qi. Soft Switching Characteristics of the Three-Port Isolated DC-DC Converter. Transactions of China Electrotechnical Society, 2021, 36(23): 5014-5026.
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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.200963          https://dgjsxb.ces-transaction.com/CN/Y2021/V36/I23/5014