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A Single-Phase Hybrid Six-Leg AC–DC–AC Multilevel Converter
IEEE Transactions on Industry Applications ( IF 4.4 ) Pub Date : 2021-05-11 , DOI: 10.1109/tia.2021.3079219
Andre Elias Lucena da Costa , Cursino Brandao Jacobina , Nady Rocha

This article presents a single-phase hybrid six-leg ac–dc–ac multilevel converter. The configuration is composed of a three-leg neutral point clamped converter connected in series with a three-leg two-level converter. The proposed converter provides a sinusoidal input current with unitary input power factor and it feeds the load with a stable ac voltage. The system model, operation principles, and a control strategy are presented and discussed. Additionally, a space-vector puslewidth modulation technique is developed to control the dc-link capacitors, to produce optimal voltage waveforms, and to reduce the switching losses. The converter can generate 9-level and 11-level output voltages when operating with symmetrical and asymmetrical dc-link voltages. Experimental and simulation results are presented to validate the theoretical studies.

中文翻译:

一种单相混合六脚 AC-DC-AC 多电平转换器

本文介绍了一种单相混合六腿 ac-dc-ac 多电平转换器。该配置由一个三腿中性点钳位转换器与一个三腿两电平转换器串联组成。建议的转换器提供具有单一输入功率因数的正弦输入电流,并以稳定的交流电压为负载供电。介绍并讨论了系统模型、操作原理和控制策略。此外,开发了一种空间矢量脉冲宽度调制技术来控制直流链路电容器,以产生最佳电压波形并减少开关损耗。在对称和非对称直流链路电压下运行时,转换器可以产生 9 级和 11 级输出电压。提供了实验和模拟结果来验证理论研究。
更新日期:2021-07-20
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