Multi-Level Single Phase Grid Connected Converter for Renewable Distributed System

Abstract: a single phase grid-connected converter is usually adopted In low power renewable distributed systems. This paper deals with a A review of the multi level topologies , a theoretical power loss comparison with the proposed solution is realized. The proposed converter is full-bridge architecture with two extra power switches and to the midpoint of the dc link two diodes are connected . Since the two more levels are obtained when two capacitor of dc link is discharge, the balancing of the midpoint voltage is achieved with pulse width modulation (PWM) strategy, Multilevel converters have been under research and development for found successful industrial application. This is still a technology under development and many new commercial topologies have been reported in the last few years advances made in modulation and control of multilevel converters are also mention. A great part of this paper is to show non traditional applications powered by multilevel converters and how multilevel converters are becoming an enabling technology in more industrial areas.This technology developed for renewable energy scheme where unity power factor required . a variation of the proposed topology which allows four-quadrant operations.

Keywords: Cascaded Full-Bridge, Hybrid Five-Level Topologies, SPWM, THD, DC to AC Conversion Distributed power Generation, grid- connected converters, Single – phase system multilevel converters. Multilevel power conversion; Power quality; Harmonic reduction