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Comparison and validation of three global-to-beam irradiance models against ground measurements

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Published in Solar Energy. 2008, vol. 82, no. 6, p. 501-512
Abstract The study presents a comparison and validation of 3 state of the art-global-to-beam irradiance conversion models against ground measurements from 22 sites covering a wide range of latitudes, altitudes and climates. One of the 3 models takes into account a climatic turbidity and gives slightly better results in terms of bias and precision. On a hourly time step basis, the validation on over 100,000 station-hour values shows that the normal beam irradiance can be evaluated from the global horizontal component with a negligible bias and a precision of 85 W m−2 or 23%. When the models are used on data with a shorter time step, the performance decreases, but remains acceptable. With a modification of the DirIndex (or the DirInt) model, the performance can slightly be increased and reach a bias of 2% and a precision of 28% for 10 min data.
Keywords Global and beam irradianceDiffuse fractionModel validation
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Research groups Systèmes énergétiques
ISE Pôle Sciences
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INEICHEN, Pierre. Comparison and validation of three global-to-beam irradiance models against ground measurements. In: Solar Energy, 2008, vol. 82, n° 6, p. 501-512. https://archive-ouverte.unige.ch/unige:17199

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Deposited on : 2011-10-17

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