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Differentiation of multiple maximum power points of partially shaded photovoltaic power generators

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Differentiation of multiple maximum power points of partially shaded photovoltaic power generators. / Mäki, Anssi; Valkealahti, Seppo.

In: Renewable Energy, Vol. 71, 11.2014, p. 89-99.

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@article{fc87bced012244138ff0ee49c0ba78c1,
title = "Differentiation of multiple maximum power points of partially shaded photovoltaic power generators",
abstract = "Partial shading conditions have a major effect on the electrical characteristics of photovoltaic (PV) power generators. In this paper, the effects of partial shading on maximum power points (MPPs) of a PV power generator have been systematically studied by using Simulink simulation model of a PV power generator composed of 18 series-connected PV modules. It is shown that the local MPPs can be classified into MPPs at low and high voltages based on the MPP operating point of the PV generator. The results also show that based on the MPP current and voltage it is possible to directly know if the MPP at high voltages is a local or a global MPP. The differentiation between local and global MPPs at high voltages is based on the voltage difference between the actual MPP voltage at high voltages and the theoretical MPP voltage under corresponding uniform conditions. This differentiation method was also tested to work correctly by utilizing experimental measurements of the Tampere University of Technology Solar PV Power Station Research Plant. By using this method, it can be identified if the system is operating at a local or a global MPP. This method can further be utilized to develop global MPP tracking algorithms. (C) 2014 Elsevier Ltd. All rights reserved.",
keywords = "Global maximum power point, Maximum power point, Maximum power point tracking, Partial shading, Photovoltaic power generator, CURRENT-VOLTAGE CHARACTERISTICS, PARTIAL SHADING CONDITIONS, SOLAR-CELLS, THERMAL-MODEL, PV MODULE, ARRAYS, SIMULATION, TRACKING, SYSTEMS, MISMATCH",
author = "Anssi M{\"a}ki and Seppo Valkealahti",
note = "Contribution: organisation=dee,FACT1=1<br/>Portfolio EDEND: 2014-06-17<br/>Publisher name: Pergamon",
year = "2014",
month = "11",
doi = "10.1016/j.renene.2014.05.018",
language = "English",
volume = "71",
pages = "89--99",
journal = "Renewable Energy",
issn = "0960-1481",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Differentiation of multiple maximum power points of partially shaded photovoltaic power generators

AU - Mäki, Anssi

AU - Valkealahti, Seppo

N1 - Contribution: organisation=dee,FACT1=1<br/>Portfolio EDEND: 2014-06-17<br/>Publisher name: Pergamon

PY - 2014/11

Y1 - 2014/11

N2 - Partial shading conditions have a major effect on the electrical characteristics of photovoltaic (PV) power generators. In this paper, the effects of partial shading on maximum power points (MPPs) of a PV power generator have been systematically studied by using Simulink simulation model of a PV power generator composed of 18 series-connected PV modules. It is shown that the local MPPs can be classified into MPPs at low and high voltages based on the MPP operating point of the PV generator. The results also show that based on the MPP current and voltage it is possible to directly know if the MPP at high voltages is a local or a global MPP. The differentiation between local and global MPPs at high voltages is based on the voltage difference between the actual MPP voltage at high voltages and the theoretical MPP voltage under corresponding uniform conditions. This differentiation method was also tested to work correctly by utilizing experimental measurements of the Tampere University of Technology Solar PV Power Station Research Plant. By using this method, it can be identified if the system is operating at a local or a global MPP. This method can further be utilized to develop global MPP tracking algorithms. (C) 2014 Elsevier Ltd. All rights reserved.

AB - Partial shading conditions have a major effect on the electrical characteristics of photovoltaic (PV) power generators. In this paper, the effects of partial shading on maximum power points (MPPs) of a PV power generator have been systematically studied by using Simulink simulation model of a PV power generator composed of 18 series-connected PV modules. It is shown that the local MPPs can be classified into MPPs at low and high voltages based on the MPP operating point of the PV generator. The results also show that based on the MPP current and voltage it is possible to directly know if the MPP at high voltages is a local or a global MPP. The differentiation between local and global MPPs at high voltages is based on the voltage difference between the actual MPP voltage at high voltages and the theoretical MPP voltage under corresponding uniform conditions. This differentiation method was also tested to work correctly by utilizing experimental measurements of the Tampere University of Technology Solar PV Power Station Research Plant. By using this method, it can be identified if the system is operating at a local or a global MPP. This method can further be utilized to develop global MPP tracking algorithms. (C) 2014 Elsevier Ltd. All rights reserved.

KW - Global maximum power point

KW - Maximum power point

KW - Maximum power point tracking

KW - Partial shading

KW - Photovoltaic power generator

KW - CURRENT-VOLTAGE CHARACTERISTICS

KW - PARTIAL SHADING CONDITIONS

KW - SOLAR-CELLS

KW - THERMAL-MODEL

KW - PV MODULE

KW - ARRAYS

KW - SIMULATION

KW - TRACKING

KW - SYSTEMS

KW - MISMATCH

U2 - 10.1016/j.renene.2014.05.018

DO - 10.1016/j.renene.2014.05.018

M3 - Article

VL - 71

SP - 89

EP - 99

JO - Renewable Energy

JF - Renewable Energy

SN - 0960-1481

ER -