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Sigma Converter for Partial Shading Problem in PV System

Author(s):

Arathy Davis , VIDYA ACADEMY OF SCIENCE AND TECHNOLOGY; Praveesh V V, VIDYA ACADEMY OF SCIENCE AND TECHNOLOGY

Keywords:

Photovoltaic Systems, Partial Shading, Series configuration, Parallel Configuration, Bypass Diodes, Sigma Converter

Abstract

The search for new energy sources gained momentum in the 1970s following the oil crisis when the price of energy in the form of fossil fuel rose dramatically and energy insecurity was felt. The obvious choice of a clean energy source which is abundant and could provide security for the future development and growth is suns energy using photovoltaic PV system. A major challenge in using a solar PV source containing a number of cells in series and parallel is to deal with its nonlinear characteristics and non-uniform radiation. Often PV modules are subject to non-uniform radiation and shading over the surface. Shade is a significant design factor and measuring the extent of shade on a solar array can be challenging due to the fact that shadows moves as the position moves throughout the day and the year. This is further complicated by the changes in the source of shade itself. For example a tree can sway in the wind or lose its leaves during winter, changing the type of shade it cast on solar array. Shade impact depends on its severity and area on PV panel. It may cause current mismatch among PV panel which results in loss of PV power. In this paper study of partial shading, design and simulation of a converter based on sigma conversion concept which enables module level dc/dc converters for eliminating the reduction in output power due to partial shading, soiling etc. has done. Converters are designed such that it will provide a constant output voltage even though shading occurs on certain PV modules. Thus the system is simple, power can be extracted from unshaded module and reliable.

Other Details

Paper ID: IJSRDV5I51222
Published in: Volume : 5, Issue : 5
Publication Date: 01/08/2017
Page(s): 1682-1690

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