Abstract: Multilevel inverter has appeared as one of the important topologies in the area of high power and medium voltage situation. These “multilevel inverters” have attracted numerous applications irrespective of the power ratings because they can efficiently realize lower harmonics with reduced switching frequency and also produce high voltages with reduced “total harmonic distortion” (THD). This paper uses MOSFETs and IGBTs to model “Diode clamped” and “Cascaded H-bridge multilevel inverter” and analyse the harmonic content. In addition, through a comparative analysis of the topologies, this paper demonstrates the features of the different “multilevel inverter” topologies. The performance of the proposed topologies is realised using MATLAB/Simulink.
Keywords: Multilevel Inverter (MLI), Diode Clamped Multilevel Inverter (DCMLI), Cascaded H-bridge Inverter (CHB), Pulse Width Modulation (PWM), Total Harmonic Distortion (THD).