ABSTRACT Controlled Diode Bridge Clamped (CDBC) three level inverter configuration is the optimized version of T-type voltage source inverter in terms of power switches and their associated gate driver components. After a brief introduction of CDBC VSI, this paper implements the concept of Z-source inverter into this configuration. The three level SVPWM technique has been used for the generation of gating pulses. It has been pointed out that, in contrast to three level VSI, the switching frequency of three level ZSI depends on the modulation index for any particular carrier frequency. Also, a new switching state pattern has been suggested for optimizing the switching frequency of the power switches using max constant boost (MCB) and simple boost control (SBC) approach of voltage boosting. Comparing the same category of MCB or SBC control, the proposed switching pattern offers minimum switching frequency of power switches without affecting total harmonic distortion of line voltage/current as compared to the existing PWM switching patterns of three level ZSI. The condition of nearest three vector switching has been followed to ensure better output waveform quality. Simulation and experimental results verify the proposed inverter configuration and its PWM technique.

中文翻译：

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可控二极管桥钳位三电平Z源逆变器及其PWM控制

摘要 可控二极管桥式钳位 (CDBC) 三电平逆变器配置是 T 型电压源逆变器在功率开关及其相关栅极驱动器组件方面的优化版本。在简要介绍了 CDBC VSI 之后，本文将 Z 源逆变器的概念实现到该配置中。三级 SVPWM 技术已用于生成门控脉冲。已经指出，与三级 VSI 相比，三级 ZSI 的开关频率取决于任何特定载波频率的调制指数。此外，还提出了一种新的开关状态模式，用于使用最大恒定升压 (MCB) 和简单升压控制 (SBC) 升压方法来优化电源开关的开关频率。比较同类别的MCB或SBC控制，与现有的三电平 ZSI PWM 开关模式相比，所提出的开关模式提供了功率开关的最小开关频率，而不会影响线电压/电流的总谐波失真。遵循最近的三矢量切换条件，以确保更好的输出波形质量。仿真和实验结果验证了所提出的逆变器配置及其 PWM 技术。