This paper proposes a novel T-type multilevel inverter (MLI) based on the switched-capacitor technique. The proposed inverter not only achieves that the maximum voltage stress of the switches is less than the input voltage but also has a voltage boost capability, which makes it suitable in high voltage applications. It is worth mentioning that the proposed inverter features two topology extension schemes which help it achieve a higher output level and voltage gain. With the merit of low voltage stress and reduced power devices, a seven-level inverter can be achieved using only two capacitors. Moreover, capacitor voltage self-balancing capability can simplify the complexity of the circuit and control. The topology, operating principle, modulation strategy and analysis of the capacitor of the inverter are presented. The superiorities of the proposed inverter are investigated by comparing with recently proposed hybrid MLIs and switched-capacitor MLIs. Finally, a seven-level prototype is constructed to validate the correctness of the theoretical analysis and the feasibility and effectiveness of the proposed inverter.

中文翻译：

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具有低压应力和自平衡功能的T型开关电容器多电平逆变器

本文提出了一种基于开关电容技术的新型T型多电平逆变器（MLI）。所提出的逆变器不仅实现了开关的最大电压应力小于输入电压，而且还具有升压能力，使其适合于高电压应用。值得一提的是，拟议的逆变器具有两种拓扑扩展方案，可帮助其实现更高的输出电平和电压增益。凭借低电压应力和低功耗设备的优点，仅使用两个电容器即可实现七电平逆变器。此外，电容器电压自平衡能力可以简化电路和控制的复杂性。介绍了逆变器电容器的拓扑结构，工作原理，调制策略和分析。通过与最近提出的混合MLI和开关电容器MLI进行比较，研究了提出的逆变器的优势。最后，构建了一个七级原型来验证理论分析的正确性以及所提出的逆变器的可行性和有效性。