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Global Solar Radiation Forecasting Using Square Root Regularization-Based Ensemble
Joint Authors
Source
Mathematical Problems in Engineering
Issue
Vol. 2019, Issue 2019 (31 Dec. 2019), pp.1-20, 20 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2019-05-14
Country of Publication
Egypt
No. of Pages
20
Main Subjects
Abstract EN
In recent decades, the integration of solar energy sources has gradually become the main challenge for global energy consumption.
Therefore, it is essential to predict global solar radiation in an accurate and efficient way when estimating outputs of the solar system.
Inaccurate predictions either cause load overestimation that results in increased cost or failure to gather adequate supplies.
However, accurate forecasting is a challenging task because solar resources are intermittent and uncontrollable.
To tackle this difficulty, several machine learning models have been established; however, the forecasting outcomes of these models are not sufficiently accurate.
Therefore, in this study, we investigate ensemble learning with square root regularization and intelligent optimization to forecast hourly global solar radiation.
The main structure of the proposed method is constructed based on ensemble learning with a random subspace (RS) method that divides the original data into several covariate subspaces.
A novel covariate-selection method called square root smoothly clipped absolute deviation (SRSCAD) is proposed and is applied to each subspace with efficient extraction of relevant covariates.
To combine the forecasts obtained using RS and SRSCAD, a firefly algorithm (FA) is used to estimate the weights assigned to individual forecasts.
To handle the complexity of the proposed ensemble system, a simple and efficient algorithm is derived based on a thresholding rule and accelerated gradient method.
To illustrate the validity and effectiveness of the proposed method, global solar radiation datasets of eight locations of Xinjiang province in China are considered.
The experimental results show that the proposed RS-SRSCAD-FA achieves the best performances with a mean absolute percentage error, root-mean-square error, Theil inequality coefficient, and correlation coefficient of 0.066, 20.21 W/m2, 0.016, 3.40 s, and 0.98 in site 1, respectively.
For the other seven datasets, RS-SRSCAD-FA still outperforms other approaches.
Finally, a nonparametric Friedman test is applied to perform statistical comparisons of results over eight datasets.
American Psychological Association (APA)
Dong, Yao& Jiang, He. 2019. Global Solar Radiation Forecasting Using Square Root Regularization-Based Ensemble. Mathematical Problems in Engineering،Vol. 2019, no. 2019, pp.1-20.
https://search.emarefa.net/detail/BIM-1200739
Modern Language Association (MLA)
Dong, Yao& Jiang, He. Global Solar Radiation Forecasting Using Square Root Regularization-Based Ensemble. Mathematical Problems in Engineering No. 2019 (2019), pp.1-20.
https://search.emarefa.net/detail/BIM-1200739
American Medical Association (AMA)
Dong, Yao& Jiang, He. Global Solar Radiation Forecasting Using Square Root Regularization-Based Ensemble. Mathematical Problems in Engineering. 2019. Vol. 2019, no. 2019, pp.1-20.
https://search.emarefa.net/detail/BIM-1200739
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1200739