一种新型多电平逆变器及其模块化分析

doi:10.19595/j.cnki.1000-6753.tces.211002

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摘要为改善传统多电平逆变器有源器件数量较多以及扩展结构复杂的问题,该文提出一种降低器件数量且可模块化扩展的多电平逆变器。该逆变器由分压电容单元、开关电容单元和两个半桥组成,使用1个直流电源、4个电容、8个开关管和2个二极管实现2倍电压增益和九电平交流输出电压。该逆变器通过2个半桥代替后端H桥转换输出电压极性,可以有效降低开关管总电压应力;在所提逆变器的模块化扩展结构中,电容逐级充电的工作方式进一步提高了电压增益和输出电平数。该文研究逆变器的工作状态、调制策略、电容分析、参数计算并进行拓扑对比。最后,通过仿真与实验验证了所提逆变器的可行性和理论分析的正确性。

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	王要强
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	梁军

关键词 ：逆变器, 多电平, 开关电容, 电压自平衡, 模块化

Abstract：In order to improve the problems of the large number of active components and the complex expansion structure of the traditional multilevel inverter, this paper proposes a multilevel inverter that reduces the number of components and can be modularly expanded. The inverter is composed of a voltage divider capacitor unit, a switched capacitor unit and two half bridges. It uses 1 DC power supply, 4 capacitors, 8 switches and 2 diodes to achieve double voltage gain and a nine-level AC output voltage. Two half-bridges are used in the proposed inverter instead of the back-end H-bridge to convert the output voltage polarity, which can effectively reduce the total voltage stress of the switches. In the modular expansion structure of the proposed inverter, the step-by-step charging method of the capacitors further improves the voltage gain and the output level number. This paper includes the working states, modulation strategy, capacitance analysis, parameter calculation, and topology comparison of the proposed inverter. Finally, the feasibility of the proposed inverter and the correctness of the theoretical analysis are verified through simulation and experiment.

Key words： Inverter multilevel switched capacitor voltage self-balancing modular

收稿日期: 2021-07-07

PACS:

TM464

基金资助:国家自然科学基金项目（51507155）、河南省高等学校青年骨干教师项目（2019GGJS011）和河南省重点研发与推广专项项目（222102520001）资助

通讯作者: 赵朝阳男,1992年生,博士,讲师,主要研究方向为电力电子功率变换理论及其应用。E-mail: zhaoyangzhao@zzu.edu.cn

作者简介: 王要强男,1982年生,博士,副教授,主要研究方向为电力电子变换、可再生能源发电、电机驱动控制等。E-mail: WangyqEE@163.com

引用本文:

王要强, 李娜, 赵朝阳, 陈天锦, 梁军. 一种新型多电平逆变器及其模块化分析[J]. 电工技术学报, 2022, 37(18): 4676-4687. Wang Yaoqiang, Li Na, Zhao Zhaoyang, Chen Tianjin, Liang Jun. A New Type of Multilevel Inverter and Its Modular Analysis. Transactions of China Electrotechnical Society, 2022, 37(18): 4676-4687.

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