A Review on Recent Advancements in Multilevel Inverter Topologies with Reduced Number of Power Switch

Multilevel inverters (MLI) are commonly used for grid integration of renewable energy sources (RES) and for high-power industrial applications. MLI has excellent characteristics, such as high-level output voltage with minimal distortion of harmonics, meeting the requirements of power efficiency. General MLI topologies have a more complicated circuit, with more part numbers, high total cost and area of installation. This paper thus provides a synthesis of knowledge of the various topologies of the MLI and maps the knowledge gaps. The conceptual diagram with the switching sequence table and mathematical equations of the topology has been defined and also covers most of the newly formed MLI, and this paper has effectively outlined the useful information. The need for the hour, along with the required modulation method, is due to a huge number of power semiconductor switch and control circuit isolation, less electronic power switches and dc source. In this article, some of the configurations with less power switches and MLI configuration for induction motor drive are checked.