Hybrid approaches based on deep whole-sky-image learning to photovoltaic generation forecasting

Weicong Kong, Youwei Jia, Zhao Yang Dong, Ke Meng and Songjian Chai

Applied Energy, 2020, vol. 280, issue C, No S0306261920313465

Abstract: With the ever-increased penetration of solar energy in the power grid, solar photovoltaic forecasting has become an indispensable aspect in maintaining power system stability and economic operation. At the operating stage, the forecasting accuracy of renewables has a direct influence on energy scheduling and dispatching. In this paper, we propose a series of novel approaches based on deep whole-sky-image learning architectures for very short-term solar photovoltaic generation forecasting, of which the lookahead windows concern the scales from 4 to 20 min. In particular, multiple deep learning models with the integration of both static sky image units and dynamic sky image stream are explicitly investigated. Extensive numerical studies on various models are carried out, through which the experimental results show that the proposed hybrid static image forecaster provides superior performance as compared to the benchmarking methods (i.e. the ones without sky images), with up to 8.3% improvement in general, and up to 32.8% improvement in the cases of ramp events. In addition, case studies at multiple time scales reveal that sky-image-based models can be more robust to the ramp events in solar photovoltaic generation.

Keywords: Solar generation forecasting; Deep learning; Whole Sky image; Convolutional LSTM (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (29)

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DOI: 10.1016/j.apenergy.2020.115875

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