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Research Papers

Analysis and Performance of a Two-Axis PV Tracker in Southern Spain

[+] Author and Article Information
G. Almonacid, F. Baena, P. Pérez-Higueras, J. Terrados, M. J. Ortega

IDEA Research Group, Center of Advanced Studies in Energy and Environment, University of Jaén, Campus Las Lagunillas, CP 23071 Jaén, Spainemunoz@ujaen.es

E. Muñoz1

IDEA Research Group, Center of Advanced Studies in Energy and Environment, University of Jaén, Campus Las Lagunillas, CP 23071 Jaén, Spainemunoz@ujaen.es

The productivity is calculated, dividing the 40,158 kWh injected to the grid for 2 years by the 9.6 kWp of the generator nominal power at standard test conditions.

1

Corresponding author.

J. Sol. Energy Eng 133(1), 011004 (Jan 24, 2011) (7 pages) doi:10.1115/1.4003297 History: Received June 25, 2010; Revised December 17, 2010; Published January 24, 2011; Online January 24, 2011

El Girasol, a two-axis photovoltaic (PV) tracker system of 9.6 kWp connected to the grid at the Campus of the University of Jaén in Southern Spain, has reached an average yield of 2092kWh/kWp·year. As far as it is known, it is one of the highest productivity data reported up to now in PV systems. This paper presents a description of the system and the working analysis during 2 years of operation. Related to the system behavior, the following performances are highlighted: global efficiency of 10.4%, performance ratio of 73.1%, a yield increase versus a fixed and ideally faced PV system of 45.8%, and high operation reliability with minimal maintenance needs.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

The two-axis PV tracker: El Girasol (courtesy of Solfocus)

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Figure 2

Rear view of the two-axis PV tracker (courtesy of Solfocus)

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Figure 3

Electrical diagram of the system

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Figure 4

Subdivision in the PV generator

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Figure 5

Irradiance measured in the representative day (Jun. 21, 2007)

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Figure 6

Schematic draw of the system with operational data values for Jun. 21, 2007

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Figure 7

dc power data for the PV generator on Jun. 21, 2007

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Figure 8

ac power data for the PV generator on Jun. 21, 2007

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Figure 9

dc power of the PV tracking system versus fixed generator optimum tilted

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Figure 10

Shading of the PV system at dawn (left) and sunset (right)

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