A Modified INC Method for PV String Under Uniform Irradiance and Partially Shaded Conditions

Due to the bypass diodes, the partially shaded photovoltaic (PV) string exhibits multiple peaks in the <italic>P-V</italic> curve. And the conventional Maximum Power Point Tracking (MPPT) methods are not capable of tracking the global peak (GP) under partially shaded condition (PSC). In...

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Autores principales:	Libin Xu, Ruofa Cheng, Jiajing Yang
Formato:	article
Lenguaje:	EN
Publicado:	IEEE 2020
Materias:	PV string maximum power point tracking (MPPT) global peak (GP) uniform irradiance condition (UIC) partially shaded condition (PSC) Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/0e1470b091754f77a1feebc78d895007
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spelling	oai:doaj.org-article:0e1470b091754f77a1feebc78d8950072021-11-19T00:05:11ZA Modified INC Method for PV String Under Uniform Irradiance and Partially Shaded Conditions2169-353610.1109/ACCESS.2020.3009668https://doaj.org/article/0e1470b091754f77a1feebc78d8950072020-01-01T00:00:00Zhttps://ieeexplore.ieee.org/document/9142227/https://doaj.org/toc/2169-3536Due to the bypass diodes, the partially shaded photovoltaic (PV) string exhibits multiple peaks in the <italic>P-V</italic> curve. And the conventional Maximum Power Point Tracking (MPPT) methods are not capable of tracking the global peak (GP) under partially shaded condition (PSC). In order to track the GP fast and efficiently under uniform irradiance condition (UIC) and PSC, a modified incremental conductance (INC) method is proposed in this paper. This method can not only detect the occurrence of PSC, but also determine if the other peaks need to be tracked under PSC by using the relationship between the minimum current at other peaks and the short circuit current to enhance the tracking speed. In order to improve efficiency, the converter duty cycle will be regulated slightly to ensure that the operating point reaches in the vicinity of GP, after the approximate GP is located. The Matlab simulation results show that the proposed method is faster and more efficient than other methods. It only requires 3 and 11 sampling cycles to locate the GP under UIC and PSC, respectively. Its overall tracking efficiency is increased by 13.61%, 4.28% and 0.42% under UIC, PSC and one-day irradiance profile respectively, compared to the conventional INC method.Libin XuRuofa ChengJiajing YangIEEEarticlePV stringmaximum power point tracking (MPPT)global peak (GP)uniform irradiance condition (UIC)partially shaded condition (PSC)Electrical engineering. Electronics. Nuclear engineeringTK1-9971ENIEEE Access, Vol 8, Pp 131340-131351 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	PV string maximum power point tracking (MPPT) global peak (GP) uniform irradiance condition (UIC) partially shaded condition (PSC) Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	PV string maximum power point tracking (MPPT) global peak (GP) uniform irradiance condition (UIC) partially shaded condition (PSC) Electrical engineering. Electronics. Nuclear engineering TK1-9971 Libin Xu Ruofa Cheng Jiajing Yang A Modified INC Method for PV String Under Uniform Irradiance and Partially Shaded Conditions
description	Due to the bypass diodes, the partially shaded photovoltaic (PV) string exhibits multiple peaks in the <italic>P-V</italic> curve. And the conventional Maximum Power Point Tracking (MPPT) methods are not capable of tracking the global peak (GP) under partially shaded condition (PSC). In order to track the GP fast and efficiently under uniform irradiance condition (UIC) and PSC, a modified incremental conductance (INC) method is proposed in this paper. This method can not only detect the occurrence of PSC, but also determine if the other peaks need to be tracked under PSC by using the relationship between the minimum current at other peaks and the short circuit current to enhance the tracking speed. In order to improve efficiency, the converter duty cycle will be regulated slightly to ensure that the operating point reaches in the vicinity of GP, after the approximate GP is located. The Matlab simulation results show that the proposed method is faster and more efficient than other methods. It only requires 3 and 11 sampling cycles to locate the GP under UIC and PSC, respectively. Its overall tracking efficiency is increased by 13.61%, 4.28% and 0.42% under UIC, PSC and one-day irradiance profile respectively, compared to the conventional INC method.
format	article
author	Libin Xu Ruofa Cheng Jiajing Yang
author_facet	Libin Xu Ruofa Cheng Jiajing Yang
author_sort	Libin Xu
title	A Modified INC Method for PV String Under Uniform Irradiance and Partially Shaded Conditions
title_short	A Modified INC Method for PV String Under Uniform Irradiance and Partially Shaded Conditions
title_full	A Modified INC Method for PV String Under Uniform Irradiance and Partially Shaded Conditions
title_fullStr	A Modified INC Method for PV String Under Uniform Irradiance and Partially Shaded Conditions
title_full_unstemmed	A Modified INC Method for PV String Under Uniform Irradiance and Partially Shaded Conditions
title_sort	modified inc method for pv string under uniform irradiance and partially shaded conditions
publisher	IEEE
publishDate	2020
url	https://doaj.org/article/0e1470b091754f77a1feebc78d895007
work_keys_str_mv	AT libinxu amodifiedincmethodforpvstringunderuniformirradianceandpartiallyshadedconditions AT ruofacheng amodifiedincmethodforpvstringunderuniformirradianceandpartiallyshadedconditions AT jiajingyang amodifiedincmethodforpvstringunderuniformirradianceandpartiallyshadedconditions AT libinxu modifiedincmethodforpvstringunderuniformirradianceandpartiallyshadedconditions AT ruofacheng modifiedincmethodforpvstringunderuniformirradianceandpartiallyshadedconditions AT jiajingyang modifiedincmethodforpvstringunderuniformirradianceandpartiallyshadedconditions
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A Modified INC Method for PV String Under Uniform Irradiance and Partially Shaded Conditions

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