Abstract
This paper presents a comparative study of some of the topologies of asymmetrical multilevel inverters (MLI), which have been the focus of work of many researchers due to its many advantages over the conventional two-level inverter. Reduction in the total harmonic distortion (THD), lesser electromagnetic interference and increased fault-tolerant capability are some of the merits of MLIs. They can be classified into symmetrical and asymmetrical structures. The asymmetrical MLIs have a different magnitude of DC sources which results in obtaining more number of levels. The different modulation techniques used in MLIs are also discussed. The comparison parameters between the different topologies are the number of switches, number of driver circuits, number of DC sources, and number of levels. Comparison has been shown in the tabular form. Graphical analysis of the comparison has also been added in the paper for a better understanding.
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