Abstract
Multilevel inverter circuits are widely used in the field of power generation, power quality devices, energy transmission, etc. Existing MLI have some limitations like a higher percentage of THD and reduced voltage magnitude. In this paper, two different topologies of the cascaded H-bridge MLI are discussed. The first topology uses a single DC voltage source that is shared by all MLI bridges, providing better output results. This topology is the combination of H-bridges connected in parallel at the source side, reducing the voltage sources required. The second topology, on the other hand, does have fewer switches and uses capacitors as a secondary source instead of voltage sources. H-bridges connected in this type of MLI are in series. Such two topologies are designed and simulated in MATLAB simulation software and compared as well. The said article presents a comparison within each topology based on its input DC voltage, percentage THD, Vrms, number of switches, as well as H-bridge prerequisite, among other factors.
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