Conformalized temporal convolutional quantile regression networks for wind power interval forecasting

• Published in: Energy (Oxford) Vol. 248; p. 123497
• Main Authors: Hu, Jianming, Luo, Qingxi, Tang, Jingwei, Heng, Jiani, Deng, Yuwen
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.06.2022; Elsevier BV
• Subjects: Algorithms; Conformalized quantile regression; Decision making; Electric power; Electric power systems; Forecasting; Iterative methods; Mathematical models; Predictions; Regression; Renewable energy; Temporal convolutional network; Wind power; Wind power interval prediction; Temporal convolutional network; Conformalized quantile regression; Wind power interval prediction
• DOI: 10.1016/j.energy.2022.123497
• ISSN: 0360-5442

Wind power interval prediction is an effective technique for quantifying forecasting uncertainty caused by the intermittent and fluctuant characteristics of wind energy. Valid coverage and short interval length are the two most critical targets in interval prediction to attain reliable and accurate information, providing effective support for decision-makers to better control the risks in the power planning. This paper proposes a novel interval prediction approach named conformalized temporal convolutional quantile regression networks (CTCQRN) which combines the conformalized quantile regression (CQR) algorithm with a temporal convolutional network (TCN), without making any distributional assumptions. The proposed model inherits the advantages of quantile regression and conformal prediction that is fully adaptive to heteroscedasticity implicated in data, and meets the theoretical guarantee of valid coverage. As opposed to conventional RNN-based approaches, the adopted TCN architecture frees from suffering iterative propagation and gradient vanishing/explosion, and can handle very long sequences in a parallel manner. Case studies on two different geographical wind power datasets show that the proposed model has a distinct edge over benchmark models in goals of valid coverage and narrow interval bandwidth, which can help to ensure the economic and secure operation of the electric power system. •A novel interval prediction model for wind power is proposed.•The TCN architecture is used to output the initial upper and lower bounds of the prediction intervals (PIs).•The conformalized quantile regression (CQR) algorithm is applied to calibrate the original prediction interval.•The proposal is adaptive to heteroscedasticity and shortens the generated PIs while satisfying the coverage requirement.