Authors : Varsha Singh, Shubhrata Gupta and Swapnajit Pattnaik
Abstract: Multilevel inverters are being utilized widely and has generated immense interest in industry and research. While the conventional topologies have proved to be viable options for high power and medium voltage applications, a lot of research in this field is leading to continuous emergence of newer topologies aimed at reducing power losses while increasing the efficiency of the inverter. In this study, a distinct topology of MLI has been proposed that is recognizably different from the conventional topology. This new design uses fewer number of DC sources to generate maximum voltage levels, accordingly the count of power switches also lessens, leading to better spectrum and minimum distortion. Asymmetrical topology is used to generate 15 level stepped voltage output and addition of voltage Level Incremental Cell (LIC) in the same topology, further improves the voltage level up to 29 levels for single phase inverter resulting in lowering of Total Harmonic Distortion (THD). The capability of the experimental prototype for proposed MLI topology to produce intended voltage levels are further corroborated by the simulation results generated using MATLAB/Simulink.
Varsha Singh, Shubhrata Gupta and Swapnajit Pattnaik, 2018. A New Design of a Voltage Source MLI and Analysis of its Applicability for Medium Power Requirements. Journal of Engineering and Applied Sciences, 13: 700-708.