@Article{PorfirioCeba:2017:VaApOv,
author = "Porfirio, Anthony Carlos Silva and Ceballos, Juan Carlos",
affiliation = "{Instituto Nacional de Pesquisas Espaciais (INPE)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)}",
title = "A method for estimating direct normal irradiation from GOES
geostationary satellite imagery: Validation and application over
Northeast Brazil",
journal = "Solar Energy",
year = "2017",
volume = "155",
pages = "178--190",
month = "Oct.",
keywords = "Solar radiation, Direct normal irradiance, Satellite data,
Satellite-derived DNI.",
abstract = "The mapping and monitoring of Direct Normal Irradiance (DNI) is
most relevant for the proper installation of solar power plants
that use concentrating solar systems. This paper presents a
satellite-based method for estimating DNI and daily direct normal
irradiation (Qn) that uses a minimal set of regional
meteorological information and avoids empirical adjustment with
ground-based radiometric data. The focus of the validation and
application were on the Northeast Brazil region (NEB), which
exhibits high solar radiation levels throughout the year. Two
basic parameters for satellite-derived DNI estimates are: (i) DNI
under clear-sky conditions DNIclear (computed from the REST model)
and (ii) cloud cover C (estimated from GOES visible imagery). The
first validations were performed by comparison with measurements
from three radiometric stations of the SONDA network in the NEB
(Petrolina, Natal and S{\~a}o Lu{\'{\i}}s) during 20072008.
Overall, the results confirmed the good performance of the
proposed model. DNI daily cycles in conditions of clear and
partially cloudy skies were represented satisfactorily, with daily
average errors within ±25 W m\−2. Good linearity was found
between the measured and satellite-estimated Qn, with coefficients
of determination (R2) ranging from 0.84 to 0.89. The average
values of MBE (Mean Bias Error) and RMSE (Root Mean Square Error)
over all sites were \−1.7% and 18.7%, respectively. In
addition, seasonal and annual average maps of direct normal
irradiation were generated over NEB for 2008. It was found that
the spatialtemporal variability of Qn is strongly modulated by
meteorological systems acting in the region, such as the ITCZ
(Intertropical Convergence Zone). The mapped results reveal that
the highest value was approximately 22 MJ m\−2 on an annual
average basis, and higher values occurred in areas of semi-arid
climate. The proposed satellite-based model may be applied for
providing information of DNI (with a spatial resolution of 4 km),
particularly over regions without in situ measurements, and
suggests good accuracy for climatic and solar resource studies.",
doi = "10.1016/j.solener.2017.05.096",
url = "http://dx.doi.org/10.1016/j.solener.2017.05.096",
issn = "0038-092X",
language = "en",
targetfile = "porfirio.pdf",
urlaccessdate = "27 abr. 2024"
}