Comparative analysis of cascade h-bridge multilevel voltage source inverter

In real time industrial applications, there are many limitations in extracting power from renewable energy sources. To meet the increasing power demand, multilevel inverter is widely used to extract power from solar cells. It synthesizes the desired ac output from several dc sources. This paper presents comparative analysis of different cascaded H-Bridge multilevel inverter topologies employing low switching frequency devices to reduce thermal stress and improve conversion efficiency. The inverter is operated on fundamental frequency switching strategy. The present topology provides high quality output power due to its more output levels, low thermal stress and high conversion efficiency. This multilevel topology enables to achieve high-quality output voltages and output currents and also immense availability because of their intrinsic switches redundancy. This paper presents comparative analysis in terms of THD and FFT of different level topologies. The different Multi level Inverter Topologies are simulated in PSIM.