Regime-dependent short-range solar irradiance forecasting

T. C. Mccandless, G. S. Young, S. E. Haupt, L. M. Hinkelman

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


This paper describes the development and testing of a cloud-regime-dependent short-range solar irradiance forecasting system for predictions of 15-min-average clearness index (global horizontal irradiance). This regime-dependent artificial neural network (RD-ANN) system classifies cloud regimes with a k-means algorithm on the basis of a combination of surface weather observations, irradiance observations, and GOES-East satellite data. The ANNs are then trained on each cloud regime to predict the clearness index. This RD-ANN system improves over the mean absolute error of the baseline clearness-index persistence predictions by 1.0%, 21.0%, 26.4%, and 27.4% at the 15-, 60-, 120-, and 180-min forecast lead times, respectively. In addition, a version of this method configured to predict the irradiance variability predicts irradiance variability more accurately than does a smart persistence technique.

Original languageEnglish (US)
Pages (from-to)1599-1613
Number of pages15
JournalJournal of Applied Meteorology and Climatology
Issue number7
StatePublished - 2016

All Science Journal Classification (ASJC) codes

  • Atmospheric Science


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