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Minimizing the Uncertainty in the Power Rating of CPV Modules
M. Martínez, I. Antón Hernández, P.J. Trujillo, J.P. Ferrer Rodríguez, R. Núñez, F. Rubio Berenguel, G. Sala
Qualification and Testing, Thermal Performance, Concentrator, Spectral Correction
Material Studies, New Concepts and Ultra-High Efficiency
Subtopic: Terrestrial Concentrator Systems
Event: 27th European Photovoltaic Solar Energy Conference and Exhibition
Session: 1BO.11.6
137 - 141
ISBN: 3-936338-28-0
Paper DOI: 10.4229/27thEUPVSEC2012-1BO.11.6
0,00 EUR
Document(s): paper


The standardization of the Power Rating methods of CPV modules and systems is a great challenge which is currently being discussed in the WG7-TC82 of the IEC committee (IEC62670 draft). This paper covers the key issues for the Outdoor Power Rating of CPV modules and systems. A first approach is to make restrictive filtering to the surrounding conditions while making the measurements. This approach results in very low dispersion in the CSOC Power calculations, around a 3%, but then very few days are suitable for carrying out the characterization. Perhaps, it could be acceptable in the Power Rating of CPV modules but it is not suitable for rating CPV systems once they are installed, when the main goal is to carry out a short term characterization to determine the real power installed in the CPV plant according to the contractual conditions. Therefore, this work proposes an alternative solution that will permit making a more relaxed filtering to the ambient conditions, increasing then the suitable days for making an Outdoor Power Rating of a CPV system. It is proposed to use an equivalent normal irradiance measurement spectrally corrected by using a Tri-band Spectro-heliometer. Also, a solution for dealing with the thermal management of a CPV system is being tested based in making a correlation of the module temperature with the ambient conditions with an outdoor thermal characterization of the technology. What has been shown is that, using this methodology for calculating the CSOC Power of a CPV system, results in a dispersion of ±2.4% using the Tri-band-Spectro-heliometer, smaller than the one obtained with a Pyrheliometer that it is of ±4.5%. Currently, this methodology is being tested with several technologies with different designs to prove its capability as a standard method for rating CPV modules and systems with an acceptable uncertainty.