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Multilevel inverter plays a crucial role in industrial applications. The performance of cascaded multilevel inverter (CMLI) with reduced switch count is analyzed in this paper. If the switches have been increased the switching loss and THD will increase. The preferred topology is simulated for seven level and fifteen level by considering isolated DC source and PV. The reduced % THD is identified compare to other topologies. Four switches continuously working at fundamental switching frequency is considered as one of the advantage of the topology.

In recent years multilevel inverters have been extensively worn in high voltage and high power applications for their unique performance. Reliability of the power electronic equipment is very essential to make sure that inverter operation should be stable and it is most important to detect and locate the faults as speedily as possible. This paper deals with open switch-fault finding method in a multilevel inverter using wavelet transformation tool. A fault diagnosis procedure is proposed and executed using MATLAB.

In the modern industrial drive system, power electronic converters are employed not only to control the electromechanical energy conversion process, but also facilitate energy efficiency and continued automation. In the drive system, induction motor (IM) is a preferred energy conversion device because of its inherent features. Nowadays, power converters using MLI’s playing vital role in the energy conversion process also multilevel configuration allow raising the power-handling capability of the system. Thus, in this paper fifteen level cascaded MLI fed closed loop V/f controlled IM drive is developed and its performance indicators have been analyzed for multicarrier carrier PWM strategy executed using MATLAB/Simulink.