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COMPARATIVE ANALYSIS OF CASCADE H-BRIDGE MULTILEVEL VOLTAGE SOURCE INVERTER ABSTRACT 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. Cascade H-Bridge Multi level inverters also have a feature of high modularity index because each inverter module will be seems like a module with similar circuit topology, modulation and, control structure. So, in the case of fault in any one of these modules, it is possible to replace it with another one quickly and easily. Moreover, with a particular control strategy, it is possible to bypass and disconnect the faulty module without interrupting the entire load, bringing an almost continuous overall availability. This paper presents basics of cascaded H-Bridge multilevel inverters, its working principle, circuit topologies, control techniques, simulation & comparative analysis in terms of THD and FFT of different level H Bridge topologies. 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. Block diagram for proposed system DESIGNG SOFTWARE AND TOOLS: MAT LAB /SIMULATION Software and sim power systems tools are used. Mainly control system tools, power electronics and electrical elements tools are used.