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Energies 2017, 10(2), 248; doi:10.3390/en10020248

A New Model for Estimating the Diffuse Fraction of Solar Irradiance for Photovoltaic System Simulations

1
Valentin Software GmbH, Stralauer Platz 34, 10243 Berlin, Germany
2
Leibniz Universität Hannover, Institute for Meteorology and Climatology, Herrenhäuser Straße 2, 30419 Hannover, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Senthilarasu Sundaram
Received: 21 December 2016 / Revised: 6 February 2017 / Accepted: 13 February 2017 / Published: 18 February 2017
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Abstract

We present a new model for the calculation of the diffuse fraction of the global solar irradiance for solar system simulations. The importance of an accurate estimation of the horizontal diffuse irradiance is highlighted by findings that an inaccurately calculated diffuse irradiance can lead to significant over- or underestimations in the annual energy yield of a photovoltaic (PV) system by as much as 8%. Our model utilizes a time series of global irradiance in one-minute resolution and geographical information as input. The model is validated by measurement data of 28 geographically and climatologically diverse locations worldwide with one year of one-minute data each, taken from the Baseline Surface Radiation Network (BSRN). We show that on average the mean absolute deviation of the modelled and the measured diffuse irradiance is reduced from about 12% to about 6% compared to three reference models. The maximum deviation is less than 20%. In more than 80% of the test cases, the deviation is smaller 10%. The root mean squared error (RMSE) of the calculated diffuse fractions is reduced by about 18%. View Full-Text
Keywords: diffuse; diffuse fraction; irradiance; model; photovoltaic (PV); simulation; irradiation; Baseline Surface Radiation Network (BSRN) diffuse; diffuse fraction; irradiance; model; photovoltaic (PV); simulation; irradiation; Baseline Surface Radiation Network (BSRN)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Hofmann, M.; Seckmeyer, G. A New Model for Estimating the Diffuse Fraction of Solar Irradiance for Photovoltaic System Simulations. Energies 2017, 10, 248.

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