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The previous studies have shown the drawbacks of conventional inverters, specially for high power application. From the beginning of 21st century, drastic improvement in the harmonic profile and increased power rating of MLI made them highly popular for high power application. MLI's are widely utilized in industrial field employing motor drives, static VAR compensators and renewable energy systems, etc. Basically output voltage of a MLI has multiple levels as compare to conventional inverters. This increment in output voltage levels greatly affect the harmonic distortion due to which the output voltage is negligibly distorted and high quality of output waveform is obtained. Because of this features the MLI are highly preferred for high voltage and high power application. Up till now many topologies for MLI have been reported. Moreover, three major MLI structures are there, Cascaded H-bridge having isolated dc source, diode clamped and flying capacitor. Though there are various types of MLI are available, CHB MLI is one of the most productive topology among multilevel family.The CHB MLI is further divided in two configuration viz., symmetrical and asymmetrical CHB MLI. It depends on cascade connection of number of H-bridge inverter cells energies by the supplies which are in geometric progression (GP) with different ratios like 2,3 etc. This paper presents cascaded MLI approach for high voltage and high power output application, in which symmetrical and asymmetrical arrangements of seven level and nine level CHB MLI are investigated for structural and operational characteristics. Simulations are carried out in Matlab Simulink to analyzed the performance of Asymmetrical CHB MLI using SPWM technique. Simulation result for this proposed scheme are shown in this paper.

In 2011, India has approximately 171 GW of installed capacity using fossil fuels. The fossil energy sources in Maharashtra state India has been depleting and short fall in centralized energy generation is growing day by day with increasing demand and Maharashtra State Electricity Distribution Company Ltd (MSEDCL) has to carry out heavy forced load shedding. Renewable energy sector growth in India during last five years has been significant. The renewable energy sources are going to become the long-term solution for future energy. India has got large potential for renewable energy sources. In this paper, economic aspect of the renewable energy is analyzed. A case of MSEDCL is presented considering the centralized energy and decentralized energy in context to economic scaling.

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