Design and Analysis of Symmetric and Asymmetric Type Cascaded H-Bridge Multilevel Inverters

Abstract

A comparative analysis between symmetric and asymmetric type cascaded H-bridge (CHB) multilevel inverters (MLI) are presented in this paper. Then, the best topology with respect to power consumption, performance and cost effectiveness is identified between them. Here, multiple voltage sources having the same value are used in the symmetric MLIs, whereas voltage sources having different values are used in the asymmetric MLIs. After that, a comparative analysis is done between thirteen-level symmetric and asymmetric type MLIs, and it is found that a lesser amount of switches and voltage sources are required in the asymmetric type CHBMLIs than that of the symmetric ones. The outputs of these two topologies are compared from the view of preparing a better sinusoidal waveform from each topology. Besides, the proposed asymmetric 13-level inverter is matched with the available structures in literature, and found that the essential switches and dc sources for the suggested design are considerably lower and more cost efficient. Eventually, the proposed asymmetric CHBMLI can be utilized in renewable power generation systems to achieve a cost-efficient power conversion process.