In this paper, a new SVPWM switching technique, named ZSVM_1TI, has been proposed for a three-level (3L) T-type Z-source inverter (ZSI). ZSVM_1TI is based on three main modifications of the existing PWM techniques for 3L inverters. First, the existing SVPWM of a 3L ZSI has been modified to double the frequency of the null interval. After that, an improved version of the maximum boost control (MBC) has been proposed based on modified SVPWM to eliminate the problem of the sixth frequency ripple components of inductor current with the existing MBC technique of ZSIs. Finally, a new switching pattern of a reduced common-mode voltage (CMV) PWM technique has been proposed to increase the switching frequency of the impedance network so that the size of the passive elements can be reduced. The proposed ZSVM_1TI has been compared with the existing PWM technique in terms of the size of the impedance network, the dc-link utilization, and the inductor current ripple profile. The above-mentioned findings have been successfully validated using theoretical analysis, simulations, and experimental results.

本文针对三级（3L）T型Z源逆变器（ZSI）提出了一种名为ZSVM_1TI的新SVPWM开关技术。ZSVM_1TI基于对3L逆变器的现有PWM技术的三个主要修改。首先，已对3L ZSI的现有SVPWM进行了修改，以使空间隔的频率加倍。之后，提出了一种基于改进的SVPWM的最大升压控制（MBC）的改进版本，以消除ZSI现有的MBC技术中电感电流的第六个频率纹波分量的问题。最后，提出了一种降低共模电压（CMV）PWM技术的新开关模式，以增加阻抗网络的开关频率，从而可以减小无源元件的尺寸。在阻抗网络的大小，直流链路利用率和电感器电流纹波方面，已将拟议的ZSVM_1TI与现有的PWM技术进行了比较。上述发现已使用理论分析，模拟和实验结果成功验证。