Convolutional Neural Network for High-Resolution Cloud Motion Prediction from Hemispheric Sky Images

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Crisosto, C.; Luiz, E.W.; Seckmeyer, G.: Convolutional Neural Network for High-Resolution Cloud Motion Prediction from Hemispheric Sky Images. In: Energies : open-access journal of related scientific research, technology development and studies in policy and management 14 (2021), Nr. 3, 753. DOI: https://doi.org/10.3390/en14030753

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Sum total of downloads: 73




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A novel high-resolution method for forecasting cloud motion from all-sky images using deep learning is presented. A convolutional neural network (CNN) was created and trained with more than two years of all-sky images, recorded by a hemispheric sky imager (HSI) at the Institute of Meteorology and Climatology (IMUK) of the Leibniz Universität Hannover, Hannover, Germany. Using the haze indexpostprocessing algorithm, cloud characteristics were found, and the deformation vector of each cloud was performed and used as ground truth. The CNN training process was built to predict cloud motion up to 10 min ahead, in a sequence of HSI images, tracking clouds frame by frame. The first two simulated minutes show a strong similarity between simulated and measured cloud motion, which allows photovoltaic (PV) companies to make accurate horizon time predictions and better marketing decisions for primary and secondary control reserves. This cloud motion algorithm principally targets global irradiance predictions as an application for electrical engineering and in PV output predictions. Comparisons between the results of the predicted region of interest of a cloud by the proposed method and real cloud position show a mean Sørensen–Dice similarity coefficient (SD) of 94 ± 2.6% (mean ± standard deviation) for the first minute, outperforming the persistence model (89 ± 3.8%). As the forecast time window increased the index decreased to 44.4 ± 12.3% for the CNN and 37.8 ± 16.4% for the persistence model for 10 min ahead forecast. In addition, up to 10 min global horizontal irradiance was also derived using a feed-forward artificial neural network technique for each CNN forecasted image. Therefore, the new algorithm presented here increases the SD approximately 15% compared to the reference persistence model.
License of this version: CC BY 4.0 Unported
Document Type: Article
Publishing status: publishedVersion
Issue Date: 2021
Appears in Collections:Fakultät für Mathematik und Physik

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pos. country downloads
total perc.
1 image of flag of Germany Germany 36 49.32%
2 image of flag of United States United States 16 21.92%
3 image of flag of China China 5 6.85%
4 image of flag of Spain Spain 2 2.74%
5 image of flag of Morocco Morocco 1 1.37%
6 image of flag of Iran, Islamic Republic of Iran, Islamic Republic of 1 1.37%
7 image of flag of Indonesia Indonesia 1 1.37%
8 image of flag of France France 1 1.37%
9 image of flag of Denmark Denmark 1 1.37%
10 image of flag of Canada Canada 1 1.37%
    other countries 8 10.96%

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