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Research Papers

An Assessment on Simple Modeling Approaches to the Electric Behavior of Two CIS PV Modules in a Sunny Climate

[+] Author and Article Information
G. Nofuentes

Grupo de Investigación y Desarrollo de Energía Solar, Escuela Politécnica Superior, University of Jaén, Campus de Las Lagunillas, s/n., 23071, Jaén, Spaingnofuen@ujaen.es

M. Fuentes, J. Aguilera, J. V. Muñoz

Grupo de Investigación y Desarrollo de Energía Solar, Escuela Politécnica Superior, University of Jaén, Campus de Las Lagunillas, s/n., 23071, Jaén, Spain

J. Sol. Energy Eng 131(3), 031013 (Jul 14, 2009) (10 pages) doi:10.1115/1.3142800 History: Received August 25, 2008; Revised February 14, 2009; Published July 14, 2009

Predicting both copper indium diselenide (CIS) module and generator performance outdoors is a crucial issue for designers and installers who use this technology. Three simple methods addressed to predict the behavior of two modules of this technology in a sunny climate have been empirically tried. A 12-month test and measurement campaign carried out using two calibrated CIS photovoltaic (PV) modules in the city of Jaén (Spain, latitude 38°N, longitude 3°W) has provided the necessary empirical data. Results show that the electric behavior of these CIS PV modules may be described with adequate accuracy—for PV engineering in sunny sites—assuming the fill factor remains constant through operation while short-circuit current and open circuit voltage vary linearly with incident global irradiance and cell temperature, respectively. Further, degradation has been of no concern—otherwise, this would have invalidated the above conclusions—as it stems from the small difference between the results of the initial calibration and those of a recalibration of the modules after their outdoor exposure. Additionally, high values of the module performance ratio lead to the same conclusion.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

I-V curve in STC of the CIS PV module A, as provided by both the manufacturer and the AIL. The terms AIL upper and lower bounds stand for the uncertainty limits related to the result of the measurement provided by the AIL.

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Figure 2

Diagram of the outdoor measurement system (IVCT) developed in the Solar Energy Laboratory of the High Technical School building of the University of Jaén

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Figure 3

Accumulated percentage of collected incident global irradiation distribution according to irradiance levels during the experimental campaign (Jun. 2006–May 2007). Data were measured by means of module A acting as a sensor.

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Figure 4

Scattering plot for the FFk method for modules A and B

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Figure 5

Monthly values of performance ratio of modules A and B

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Figure 6

Linear regression of maximum power—normalized to Gi∗=1000 W m−2—versus cell temperature for module A. Module maximum power figures at irradiances below 800 W m−2 have been disregarded to achieve a higher degree of linearity.

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Figure 7

Linear regression of maximum power—normalized to Gi∗=1000 W m−2—versus cell temperature for module B. Module maximum power figures at irradiances below 800 W m−2 have been disregarded to achieve a higher degree of linearity.

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