一种中间电容谐振型级联双向DC-DC变换器

doi:10.19595/j.cnki.1000-6753.tces.211966

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摘要为满足分布式储能系统中蓄电池组与直流母线互联时对DC-DC变换器的高效率、高功率密度、宽电压调节范围的要求,该文提出一种中间电容谐振型级联双向DC-DC变换器。该级联变换器的低压侧采用改进的谐振型双有源桥（DAB）,与传统DAB不同,该结构利用DAB高频变压器漏感与级联拓扑的中间直流母线电容进行谐振,工作频率在2倍谐振频率且在最高效率点运行;高压侧采用传统双向Buck-Boost拓扑,以提升电路的整体电压调节范围。该级联变换器具有中间直流母线电容小、电压调节范围宽、控制复杂度低、效率高、功率密度高的优点。该文首先,分析了变换器的拓扑结构、工作原理和控制策略;其次,推导了关键状态变量和电压增益;然后,建立了变换器的损耗模型,并据此进行谐振参数设计;最后,搭建了一台额定功率7.5kW的样机,其功率密度为1.15W/cm³,满载效率为95.9%,实验验证了该级联变换器高效率、高功率密度和宽电压调节范围的特性。

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关键词 ：双有源桥（DAB）变换器, 宽电压调节范围, 损耗模型, 谐振参数设计

Abstract：In order to meet the requirements of high efficiency, high power density and wide voltage regulation range of DC-DC converters for the interconnection between battery banks and DC bus in the distributed energy storage system, a cascaded bidirectional DC-DC converter with intermediate capacitor resonance is proposed. The proposed converter adopts a modified resonant dual active bridge (DAB) on the low-voltage side. Different from the conventional DAB, it uses the leakage inductance of the high-frequency transformer to resonate with the intermediate DC bus capacitor. The modified DAB runs in open-loop mode to operate at the highest efficiency point. On the low-voltage side, a conventional bidirectional Buck-Boost topology is used to extend the voltage regulation range of the cascaded converter. This proposed cascaded converter has the advantages of small intermediate DC bus capacitance, wide voltage regulation range, low control complexity, high efficiency, and high-power density. Firstly, the topology, operating principle and control strategy of the converter are analyzed. Secondly, the key state variables and voltage-gain expression are derived. Thirdly, the loss model of the converter is established, and the resonant parameters are designed accordingly. Finally, a prototype with rated power of 7.5kW is built with the power density of 1.15W/cm³ and the full load efficiency of 95.9%, which verifies the characteristics of the converter with high efficiency, high power density and wide voltage regulation range.

Key words： Dual active bridge (DAB) converter wide voltage regulation range loss model resonant parameters design

收稿日期: 2021-12-01

PACS:

TM46

基金资助:山东省自然科学基金项目（ZR2021ME249）、中国科学院前沿重点项目（QYZDB-SSW-JSC024）、中国科学院先导A课题项目（XDA21050100）和国家科技部重点研发专项项目（2017YFB0903300）资助

通讯作者: 张国驹男,1984年生,博士,研究方向为分布式发电与电网技术、电力电子技术。E-mail: zhangguoju@mail.iee.ac.cn

作者简介: 李福男,2000年生,硕士研究生,研究方向为电力电子变换器。E-mail: lfxwj@mail.iee.ac.cn

引用本文:

李福, 邓红雷, 张国驹, 裴玮, 邓卫. 一种中间电容谐振型级联双向DC-DC变换器[J]. 电工技术学报, 2022, 37(20): 5253-5266. Li Fu, Deng Honglei, Zhang Guoju, Pei Wei, Deng Wei. A Cascaded Bidirectional DC-DC Converter with Intermediate Capacitor Resonance. Transactions of China Electrotechnical Society, 2022, 37(20): 5253-5266.

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