电工技术学报  2022, Vol. 37 Issue (zk1): 235-245    DOI: 10.19595/j.cnki.1000-6753.tces.L90425
电力电子 |
适用于储能系统的准Z源模块化多电平双向DC-DC变换器的设计与控制
刘乐, 毕恺韬, 朱一昕, 樊启高, 颜文旭
江南大学物联网工程学院 无锡 214122
Design and Control of Quasi-Z-Source Modular Multilevel Bidirectional DC-DC Converter for Energy Storage System
Liu Yue, Bi Kaitao, Zhu Yixin, Fan Qigao, Yan Wenxu
School of internet of Things Engineering Jiangnan University Wuxi 214122 China
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摘要 为了解决传统模块化多电平变换器应用于储能系统中存在的问题,该文提出一种新型阻抗源模块化双向功率变换器。该变换器将双向准Z源与半桥子模组相结合,构成阻抗源子模组。双向准Z源的引入改变了模块化多电平变换器的能量转换模式,使得系统能够以降压形式进行能量存储,以升压方式进行能量释放,从而解决了传统变换器在母线电压瞬时升高时的过电流问题。此外,双向准Z源可提高半桥变换器的输入电压,从而减少串联模组数量,有助于简化系统控制结构,提升系统可靠性。该文详细分析了变换器的子模组工作原理、调制方法,并设计了系统控制策略,通过搭建的储能系统物理实验平台进行了有效验证。理论分析及实验结果表明所提变换器相较于传统模块化多电平变换器更适用于储能系统应用。
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关键词 模块化多电平变换器阻抗源储能系统双向DC-DC变换器    
Abstract:A novel impedance source modular bidirectional power converter is proposed to solve the problems of traditional modular multilevel converter applied in energy storage system. The converter combines bi-directional quasi-Z-source with half-bridge sub-module to form impedance source sub-module. The introduction of bi-directional quasi-Z-source changes the energy conversion mode of modular multilevel converter, which enables the system to store energy in buck mode and release energy in boost mode, thus solving the over-current problem of traditional converter when the bus voltage increases instantaneously. Besides, the bi-directional quasi-Z-source can increase the input voltage of the half bridge converter, thus reducing the number of series modules, which is helpful to simplify the system control structure and improve the system reliability. In this paper, the working principle and modulation method of the sub-module of the converter are analyzed in detail, and the control strategy of the system is designed. Based on the theoretical analysis and experimental results, the proposed converter is more suitable for energy storage system than the traditional modular multilevel DC-DC converter.
Key wordsModular multilevel converter    impedance source    energy storage system    bidirectional DC-DC converter   
收稿日期: 2020-07-11     
PACS: TM46  
通讯作者: 毕恺韬 男,1989年生,讲师,研究方向为多电平变换器、储能系统和控制算法。E-mail:8201905068@jiangnan.edu.cn   
作者简介: 刘 乐 男,1992年生,硕士,研究方向为电力电子技术。E-mail:liuyue@stu.jiangnan.edu.cn
引用本文:   
刘乐, 毕恺韬, 朱一昕, 樊启高, 颜文旭. 适用于储能系统的准Z源模块化多电平双向DC-DC变换器的设计与控制[J]. 电工技术学报, 2022, 37(zk1): 235-245. Liu Yue, Bi Kaitao, Zhu Yixin, Fan Qigao, Yan Wenxu. Design and Control of Quasi-Z-Source Modular Multilevel Bidirectional DC-DC Converter for Energy Storage System. Transactions of China Electrotechnical Society, 2022, 37(zk1): 235-245.
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