Modeling a Series Topology for 27-Level Multilevel Inverter with reduced number of switches and voltage sources

Abstract

From a simple power backup system for home to high power HVDC transmission of electricity, inverter plays a vital role in converting the DC power into sinusoidal AC. From the prospective of utilization of renewable energy, solar power comes first among all and it is only capable of giving DC power as its output. Again, in order to utilize that DC power to run our household appliances, inverter comes into picture. Since the invention of inverter is constantly undergone many technological advancements, starting from development of switching gates, advancement in the power handling capacities and increasing efficiency. Reducing the switching loss, increasing the level, reducing harmonics and improvement in triggering circuitry is now the research area in the field of inverter. This paper presents the modelling and control of multilevel inverter. Here the series topology is implemented to attain 27 voltage levels using 13 switch counts. The proposed model presented in this paper have been simulated in MATLAB/Simulink software package and the THD of the respective output from the model has been determined by FFT Analysis option provided in software.