Abstract

Multilevel inverters (MLIs) have become more popular due to the high-quality output waveform with higher voltage levels, lower voltage stress across the power switches, and lower harmonic distortion of the output voltage. This paper introduces two new structures of MLI based on a modified T-type inverter and switched-diode cell. Proposed inverter topologies cascaded in series due to its generalized structure. Inherent property to generate the negative voltage levels without using any full H-bridge circuit is a key feature of the proposed topology. The merit of the proposed inverter is the reduction in power electronic components, the assessment has been carried out with some recent MLI topologies, and graphs relating to the performance parameters have also been incorporated as well. Besides, total standing voltage (TSV) and the level to switch ratio (LSR) is calculated for further clarification of the proposed inverter, and the parameters are compared with the newly developed MLI topologies. A multi-carrier pulse width modulation strategy (MC-PWM) is adopted for the generation of the switching pulses.

摘要

由于高品质的输出波形具有更高的电压电平，更低的电源开关电压应力以及更低的输出谐波失真，多电平逆变器（MLI）变得越来越流行。本文介绍了基于改进的T型逆变器和开关二极管单元的MLI的两种新结构。拟议的逆变器拓扑由于其通用结构而串联起来。无需使用任何完整的H桥电路即可产生负电压电平的固有特性是所建议拓扑的关键特征。拟议中的逆变器的优点是减少了功率电子元件，已经使用一些最新的MLI拓扑进行了评估，并且还引入了与性能参数有关的图表。除了，计算总站立电压（TSV）和电平开关比（LSR），以进一步阐明所建议的逆变器，并将参数与最新开发的MLI拓扑进行比较。采用多载波脉冲宽度调制策略（MC-PWM）来生成开关脉冲。