Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Validation of the satellite products CAMS-RAD and Solcast: A case study for Petrolina-PE, using the Brazilian Irradiance Data from the National Institute of Spatial Research
Submission Author:
Mirella Martins Camelo , CE , Brazil
Co-Authors:
Mirella Martins Camelo, Paulo Alexandre Costa Rocha, Maria Eugenia V. da Silva
Presenter: Mirella Martins Camelo
doi://10.26678/ABCM.COBEM2021.COB2021-2299
Abstract
Due to the increase of research efforts focused on improvements of solar energy utilization, there is, in the last years, an expressive relevance about the analysis and validation of the accuracy of irradiance data from satellite products. This occurs according to the advantages related to these satellite products services: the simple and easy access to the internet, the low-cost purchase (some of them are free data services) and the wide data availability for essentially the entire global territory. For these reasons, one can obtain radiation data without the need of expensive measurement equipment, thus reducing costs for academic or commercial purposes. In this sense, this paper aims to validate the satellite products CAMS Radiation Service and Solcast using the comparison against the radiation data of Global Horizontal Radiation (GHI) and Normal Direct Radiation (DNI) of a ground-based measurement station located in the city of Petrolina, Northeastern Brazil, under a tropical climate. The station belongs to the Brazilian National Institute of Spatial Research (INPE). In addition, this work has also the purpose of analyzing the causes of possible variability in the accuracy obtained, such as the effects of the seasons on the local climate. Furthermore, the accuracy verification of the satellite products are done with the calculation of the error metrics: Root Mean Squared Error (RMSE), Mean Absolute Error (MAE) and R² correlation. The error metrics are applied on a solar radiation database for the years ranging from 2004-2018, with a 60-minute temporal resolution. As the first results, regarding the CAMS-RAD products, the RMSE values are 181.06 W/m² (GHI) and 313.31 W/m² (DNI). Similarly, the RMSE values of Solcast are 82.36 W/m² (GHI) and 250.98 W/m² (DNI). Previously, we can state that the DNI error is higher for both products, since the satellite modeling procedures about the clouds influence do not reach enough spatial resolution.
Keywords
Solar Energy, Satellite products, solar radiation, Copernicus Atmosphere Monitoring Service, Solcast
