Design and Implementation of PV Fed Single Switch High Gain Hybrid Converters

Abstract

The seasonal and unsteady nature of non- conventional energy sources newlinecombined with their low dc output often calls for high power conditioning circuits for use newlinein various applications like pumping water, heating, electricity generation, battery newlinecharging in electric vehicles etc. Apparently, power electronic converters with high gain newlineare required for efficient power conversion from such sources. Classical boost converters newlinehave gain limitations attributed to their internal losses and semiconductor switching newlinestress. newlineTherefore, new converter topologies with high voltage step-up ratio are being newlinedeveloped in recent times. These topologies however have their own merits and newlinedrawbacks when employed in renewable energy applications. The drawbacks include newlinehigh input current ripple, high stress across semiconductor switches, high switching losses newlineand therefore low efficiency. Researchers have attempted to overcome all these newlinedrawbacks by adopting different control strategies, soft switching techniques, topological newlinemodifications and introducing additional circuits to name a few. newlineThough these attempts were successful in overcoming certain drawbacks, all newlinethe drawbacks could not be rectified in one converter configuration. Therefore, efforts to newlineintegrate two converter topologies are undertaken so that the benefits of both can be newlinecombined to overcome the drawbacks successfully. Different combinations of converter s newlineare tried with an aim to improve the gain simultaneously having minimal switch count, newlineminimal ripple and stress. newlineIn the present work, a single stage converter has been implemented due to newlineseveral advantages when compared to a two-stage converter. The advantages are a single newlineswitch, single control circuitry, less size, more economical and high efficiency newline