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Short-Term Solar Irradiance Forecasting Using Random Forest-Based Models with a Focus on Mountain Locations
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Short-Term Solar Irradiance Forecasting Using Random Forest-Based Models with a Focus on Mountain Locations
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Short-Term Solar Irradiance Forecasting Using Random Forest-Based Models with a Focus on Mountain Locations
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Journal Article
Short-Term Solar Irradiance Forecasting Using Random Forest-Based Models with a Focus on Mountain Locations
2026
Overview
Photovoltaic (PV) power forecasting has become a key tool for the intelligent management of electrical grids. Since the largest source of error in PV power forecasting originates from uncertainties in solar irradiance prediction, improving the accuracy of solar irradiance forecasts has emerged as an active research topic. This study evaluates multiple random tree-based model versions using a challenging dataset collected at globally distributed stations, spanning elevations from sea level to nearly 4000 m and covering a wide range of climate classes. The originality of the study lies in the synergistic contribution of two elements: the innovative inclusion of diffuse irradiance among the predictors and a comparative analysis of forecast quality across lowland and mountainous locations. In such environments, accurate solar resource forecasting is particularly important for the intelligent management of stand-alone PV systems deployed at high altitudes and in remote, off-grid areas. Overall, the results identify Extremely Randomized Trees (XTRc) as the best-performing model. XTRc achieves Skill Scores ranging from 0.087 to 0.298 across individual stations. The model accuracy remains high even at mountain stations, provided that sky-condition variability is low.
Publisher
MDPI AG
