In this paper, a three-level quasi-switched boost T-type inverter (3L qSBT2I) is proposed. A new pulse-width modulated (PWM) control method is presented to reduce the inductor current ripple of the qSBT2 I. In the introduced PWM technique, the shoot-through duty cycle is maintained constant to keep the modulation index as high as possible. Then, the only control parameters of the qSBT2I are the duty cycles of the two additional switches. By controlling the duty cycles of the two additional switches, the voltage gain of the proposed qSBT2 I can be improved to a value larger than that of the conventional 3L impedance source inverters. The steady-state analysis, operating principles, and comparisons with the impedance source-based 3L inverters are presented. A 1-kW prototype is constructed to verify the operating principle of the 3L qSBT2I. An indirect dc-link voltage regulator and a capacitor voltage-balance controller are applied to the proposed qSBT2I. Simulation and experimental results are presented.

中文翻译：

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三电平准开关升压 T 型逆变器：分析、PWM 控制和验证

本文提出了一种三电平准开关升压T型逆变器(3L qSBT2I)。提出了一种新的脉宽调制 (PWM) 控制方法来降低 qSBT2 I 的电感电流纹波。在引入的 PWM 技术中，直通占空比保持恒定以保持尽可能高的调制指数。然后，qSBT2I 的唯一控制参数是两个附加开关的占空比。通过控制两个附加开关的占空比，所提出的 qSBT2 I 的电压增益可以提高到比传统 3L 阻抗源逆变器更大的值。介绍了稳态分析、工作原理以及与基于阻抗源的 3L 逆变器的比较。构建了一个 1 kW 原型来验证 3L qSBT2I 的工作原理。间接直流链路电压调节器和电容器电压平衡控制器应用于建议的 qSBT2I。给出了模拟和实验结果。