Spatiotemporal Optimization for Short-Term Solar Forecasting Based on Satellite Imagery

Energies

ChangKi Kim¹  Myeongchan Oh¹  Boyoung Kim¹  Changyeol Yun¹  Yong-Heack Kang¹  Hyun-Goo Kim¹ 

[1] New & Renewable Energy Resource Map Laboratory, Korea Institute of Energy Research, Daejeon 34129, Korea;

关键词: solar forecasting;    spatial analysis;    satellite images;    cloud motion vector (CMV);    spatiotemporal;    optimization;   

DOI  :  10.3390/en14082216

来源: DOAJ

【 摘 要 】

Solar forecasting is essential for optimizing the integration of solar photovoltaic energy into a power grid. This study presents solar forecasting models based on satellite imagery. The cloud motion vector (CMV) model is the most popular satellite-image-based solar forecasting model. However, it assumes constant cloud states, and its accuracy is, thus, influenced by changes in local weather characteristics. To overcome this limitation, satellite images are used to provide spatial data for a new spatiotemporal optimized model for solar forecasting. Four satellite-image-based solar forecasting models (a persistence model, CMV, and two proposed models that use clear-sky index change) are evaluated. The error distributions of the models and their spatial characteristics over the test area are analyzed. All models exhibited different performances according to the forecast horizon and location. Spatiotemporal optimization of the best model is then conducted using best-model maps, and our results show that the skill score of the optimized model is 21% better than the previous CMV model. It is, thus, considered to be appropriate for use in short-term forecasting over large areas. The results of this study are expected to promote the use of spatial data in solar forecasting models, which could improve their accuracy and provide various insights for the planning and operation of photovoltaic plants.

【 授权许可】

Unknown