低应力高电平开关电容逆变器及其调制策略

doi:10.19595/j.cnki.1000-6753.tces.210241

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摘要为了提高可再生能源发电系统中逆变器的升压能力并改善输出电能质量,该文提出一种低应力高电平开关电容逆变器。所提拓扑使用1个直流电源、3个电容和15个开关器件实现4倍电压增益和十七电平交流电压输出。与其他拓扑相比,所提逆变器能以较少的开关器件产生更多的电平,有效地降低了逆变器的输出谐波含量;无需后端H桥即可实现逆变过程,有效地降低了开关器件的电压应力。此外,所提逆变器的电容电压纹波小,且电容电压自平衡的优点简化了控制器的复杂度。该文详细给出所提逆变器的拓扑结构、工作机理与调制策略,分析电容电压纹波计算,并与其他类似拓扑结构进行对比,最后通过实验证明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 ：多电平逆变器, 开关电容, 低应力, 高输出电平, 电容电压自平衡

Abstract：In order to improve the boost capability and output power quality of inverters in the renewable energy power generation system, this paper proposed a switched capacitor inverter with low voltage stress and high-level characteristics. The proposed topology has one input DC source, three capacitors and fifteen switching devices, which can achieve four times voltage gain and seventeen-level output waveform. Compared with other topologies, the performance of the proposed inverter can generate more output levels with fewer switching devices, reducing the voltage stress of switching devices and the harmonic content of inverter output voltage. Moreover, the inversion process can be realized without a back-end H-bridge, and the voltage stress of switches is reduced effectively. In addition, the proposed inverter has small voltage ripple, and the capacitor voltage self-balancing performance simplifies the complexity of the controller. The paper introduces the topology, working principle, and modulation strategy of the proposed inverter in detail, and analyzes the calculation of voltage ripples. The proposed inverter shows excellent performance compared to various switched capacitor topologies. Finally, the feasibility of the proposed inverter and the correctness of the theoretical analysis are verified by the experimental results.

Key words： Multilevel inverter switched capacitor low voltage stress high output level capacitors voltage self-balancing

收稿日期: 2020-03-01

PACS:

TM464

基金资助:国家自然科学基金项目（51507155）和河南省高等学校青年骨干教师项目（2019GGJS011）资助

通讯作者: 赖锦木男,1990年生,博士,讲师,主要研究方向为电力电子变换与控制技术及其在交直流灵活配电等方面的应用。E-mail:laijinmu@126.com

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、柔性交直流输配电、电机驱动控制等。E-mail: WangyqEE@163.com

引用本文:

王要强, 张亨泰, 赖锦木, 王克文, 梁军. 低应力高电平开关电容逆变器及其调制策略[J]. 电工技术学报, 2021, 36(20): 4237-4248. Wang Yaoqiang, Zhang Hengtai, Lai Jinmu, Wang Kewen, Liang Jun. Topology and Modulation Strategy for Switched Capacitor Inverter with Low Voltage Stress and High Level. Transactions of China Electrotechnical Society, 2021, 36(20): 4237-4248.

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