A Fast and Accurate Global Maximum Power Point Tracking Method for Solar Strings under Partial Shading Conditions

This paper presents a model-based approach for the global maximum power point (GMPP) tracking of solar strings under partial shading conditions. In the proposed method, the GMPP voltage is estimated without any need to solve numerically the implicit and nonlinear equations of the photovoltaic (PV) s...

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Main Authors: S.M. Hashemzadeh, M. Hejri
Format: Article
Language:English
Published: University of Mohaghegh Ardabili 2020-12-01
Series:Journal of Operation and Automation in Power Engineering
Subjects:
Online Access:http://joape.uma.ac.ir/article_878_fe17a8252c83e74e600dfbd7f73284cd.pdf
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author S.M. Hashemzadeh
M. Hejri
author_facet S.M. Hashemzadeh
M. Hejri
author_sort S.M. Hashemzadeh
collection DOAJ
description This paper presents a model-based approach for the global maximum power point (GMPP) tracking of solar strings under partial shading conditions. In the proposed method, the GMPP voltage is estimated without any need to solve numerically the implicit and nonlinear equations of the photovoltaic (PV) string model. In contrast to the existing methods in which first the locations of all the local peaks on the P-V curve are estimated and next the place of the GMPP is selected among them, the suggested method estimates directly the GMPP without any need for the evaluation of the other local peaks. The obtained GMPP voltage is then given as a reference value to the input voltage controller of a DC-DC boost converter to regulate the output voltage of the solar string at the GMPP voltage in various irradiation conditions. Furthermore, the values of the temperature and irradiation level of each PV module within the PV string are estimated, and therefore, the proposed method does not need to thermometers and pyranometers. This makes it as a reliable and low-cost GMPP tracking method. The theoretical aspects on which the proposed GMPP algorithm is established are also discussed. The comparison of the numerical results of the suggested GMPP tracking scheme with the existing methods at different environmental conditions shows the satisfactory operation of the proposed technique from the speed and accuracy point of views.
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spelling doaj.art-698f082acc4d4a5bb6c6e849291624372022-12-22T01:32:58ZengUniversity of Mohaghegh ArdabiliJournal of Operation and Automation in Power Engineering2322-45762020-12-018324525610.22098/joape.2020.6190.1468878A Fast and Accurate Global Maximum Power Point Tracking Method for Solar Strings under Partial Shading ConditionsS.M. Hashemzadeh0M. Hejri1Department of Electrical Engineering, Sahand University of Technology, Tabriz, IranDepartment of Electrical Engineering, Sahand University of Technology, Tabriz, IranThis paper presents a model-based approach for the global maximum power point (GMPP) tracking of solar strings under partial shading conditions. In the proposed method, the GMPP voltage is estimated without any need to solve numerically the implicit and nonlinear equations of the photovoltaic (PV) string model. In contrast to the existing methods in which first the locations of all the local peaks on the P-V curve are estimated and next the place of the GMPP is selected among them, the suggested method estimates directly the GMPP without any need for the evaluation of the other local peaks. The obtained GMPP voltage is then given as a reference value to the input voltage controller of a DC-DC boost converter to regulate the output voltage of the solar string at the GMPP voltage in various irradiation conditions. Furthermore, the values of the temperature and irradiation level of each PV module within the PV string are estimated, and therefore, the proposed method does not need to thermometers and pyranometers. This makes it as a reliable and low-cost GMPP tracking method. The theoretical aspects on which the proposed GMPP algorithm is established are also discussed. The comparison of the numerical results of the suggested GMPP tracking scheme with the existing methods at different environmental conditions shows the satisfactory operation of the proposed technique from the speed and accuracy point of views.http://joape.uma.ac.ir/article_878_fe17a8252c83e74e600dfbd7f73284cd.pdfpv stringspartial shadingglobal maximum power point (gmpp)model-based gmpp techniques (gmpp)
spellingShingle S.M. Hashemzadeh
M. Hejri
A Fast and Accurate Global Maximum Power Point Tracking Method for Solar Strings under Partial Shading Conditions
Journal of Operation and Automation in Power Engineering
pv strings
partial shading
global maximum power point (gmpp)
model-based gmpp techniques (gmpp)
title A Fast and Accurate Global Maximum Power Point Tracking Method for Solar Strings under Partial Shading Conditions
title_full A Fast and Accurate Global Maximum Power Point Tracking Method for Solar Strings under Partial Shading Conditions
title_fullStr A Fast and Accurate Global Maximum Power Point Tracking Method for Solar Strings under Partial Shading Conditions
title_full_unstemmed A Fast and Accurate Global Maximum Power Point Tracking Method for Solar Strings under Partial Shading Conditions
title_short A Fast and Accurate Global Maximum Power Point Tracking Method for Solar Strings under Partial Shading Conditions
title_sort fast and accurate global maximum power point tracking method for solar strings under partial shading conditions
topic pv strings
partial shading
global maximum power point (gmpp)
model-based gmpp techniques (gmpp)
url http://joape.uma.ac.ir/article_878_fe17a8252c83e74e600dfbd7f73284cd.pdf
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AT smhashemzadeh fastandaccurateglobalmaximumpowerpointtrackingmethodforsolarstringsunderpartialshadingconditions
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