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A Grid Connected Hybrid Asymmetrical Nine level Inverter Topology Using Boost Converter

A Grid Connected Hybrid Asymmetrical Nine level Inverter Topology Using Boost Converter,G. Ravi Srikanth,K. Achyuth Charan,A. Mowmin,Syed Baji,V. Gopi

A Grid Connected Hybrid Asymmetrical Nine level Inverter Topology Using Boost Converter  
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This paper presents the distributed energy re-source (DER)-based single-phase inverter is usually adopted. In order to reduce conversion losses, the key is to save costs and size by removing any kind of transformer as well as reducing the power devices. This paper deals nine-level multi-string inverter topology for DERs-based dc/ac conversion system. Multilevel inverter (MLI) is a new breed of power converter that is suited for higher power applications. The various topologies of MLI are diode-clamped, capacitor clamped and cascaded H-bridge. This paper focuses on cascaded MLI using two unequal dc sources in order to produce nine-level output. In this study, a high step-up converter is introduced as a front-end stage to improve the conversion efficiency of conventional boost converters and to stabilize the output dc voltage of various DERs such as photovoltaic and fuel cell modules for use with the simplified MLI. The simplified MLI requires only eight active switches instead of the sixteen required in the conventional cascaded H-bridge MLI. This MLI offers strong advantages such as improved output waveforms, smaller filter size, and lower electromagnetic interference and total harmonics distortion. Simulation results show the effectiveness of the proposed solution.
Published in 2012.
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