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Technical Brief

Validation of a Simulation Model for Analysis of Shading Effects on Photovoltaic Panels

[+] Author and Article Information
Samuel K. Nashih, Carlos A. F. Fernandes

Instituto de Telecomunicações,
Lisboa 1049-001, Portugal

João Paulo N. Torres

Instituto de Telecomunicações,
Lisboa 1049-001, Portugal
e-mail: joaotorres@tecnico.ulisboa.pt

João Gomes

Department of Building,
Energy and Environmental Engineering,
University of Gävle,
Gävle 801 76, Sweden

P. J. Costa Branco

LAETA/IDMEC,
Instituto Superior Técnico,
Universidade de Lisboa,
Lisboa 1049-001, Portugal

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received November 25, 2015; final manuscript received May 12, 2016; published online June 14, 2016. Assoc. Editor: M. Keith Sharp.

J. Sol. Energy Eng 138(4), 044503 (Jun 14, 2016) (6 pages) Paper No: SOL-15-1399; doi: 10.1115/1.4033646 History: Received November 25, 2015; Revised May 12, 2016

Numerical simulation results and modeling on the electrical features of concentrating photovoltaic-thermal (PVT) using the free circuit simulation package from linear technology corporation (LTSPICE) are presented. The effects of partial shading of cell strings and temperature are analyzed, showing very good agreement with the results obtained experimentally in lab, at Lisbon University, and under outdoor testing using similar receivers, at the SME Solarus Sunpower AB, a Swedish company whose mission is the development, production, and marketing of concentrated solar technology to the world market. The potential of the used methodology for the design of the solar cell configuration is emphasized as an important tool to optimize PV and PVT performances in the energy conversion process.

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Figures

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Fig. 1

Single-diode model of a solar cell: (a) ideal solar cell model and (b) real solar cell model

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Fig. 2

Stationary characteristic I(V,G) of a photodiode under illumination

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Fig. 3

Module formed by two groups of solar cells associated in series

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Fig. 4

(a) View of Solarus PVT collector and (b) picture of a receiver and the test setup table, including the IV tracer

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Fig. 5

Solarus 4-15-15-4 test receiver

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Fig. 7

Circuit assembly in lab at Lisbon University

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Fig. 8

I(V) and P(V) experimental circuit results (dashed lines) and simulation results (solid lines): 25 °C (case A for power and case C for current) and 40 °C (case B for power and case D for current) for the configuration 20-20-20-20

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Fig. 9

I(V) and P(V) experimental circuit results (dashed lines) and simulation results (solid lines): 25 °C (case A for power and case C for current) and 40 °C (case B for power and case D for current) for the configuration 5-20-20-20

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Fig. 10

I(V) and P(V) experimental circuit results (dashed lines) and simulation results (solid lines): 25 °C (case A for power and case C for current) and 40 °C (case B for power and case D for current) for 20-5-20-20

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