Design of a new prototype of a MLI

Abstract

This paper presents design of a T-type multilevel inverters (MLI). Now-a-days, MLIs are usually require lesser number of elements like switches, capacitors as compared to conventional two-level inverters. Hence, MLIs are becoming very vital component in the area of power Electronics applications. Therefore, lots of research works are going on in this field for improvement in the topologies of MLIs. The main area of investigation in the design of MLIs are to maintain fixed level of voltage, less modulation index and switching losses. In this paper, a new type MLI such as a five-level based T-type MLI is designed and implemented. For that a prototype of the MLI is constructed. Then its performance is analyzed with appropriate simulation and experimental results. Again, its results are compared with that of another topology called five-level Cascaded H-Bridge type MLI. For better comparison, same type of modulation technique; Sinusoidal Pulse Width Modulation technique is used in both cases. The comparison is based on circuit complexity, modulation index and Total Harmonic Distortion (THD) of output voltage. From the analysis it is found that performance of the proposed MLI is better compared to that of the Cascaded H-Bridge type MLI.