Graph optimization neural network with spatio-temporal correlation learning for multi-node offshore wind speed forecasting

• Published in: Renewable energy 2021-12, Vol.180, p.1014-1025
• Main Authors: Geng, Xiulin, Xu, Lingyu, He, Xiaoyu, Yu, Jie
• Format: Article
• Language: English
• Subjects: Channel-wise attention; Deep learning; Graph neural network; Long short-term memory; Spatio-temporal dependencies; Wind speed time series forecasting
• ISSN: 0960-1481; 1879-0682
• DOI: 10.1016/j.renene.2021.08.066

Wind speed accurate forecasting plays an important role in preserving the stability of offshore wind power. Most of current predictions are based on a single wind node. It is difficult for this methods to capture wind high dimensional features and latent spatio-temporal dependencies. In this paper, we propose a general graph optimization neural network specifically for multi-node offshore wind speed prediction named spatio-temporal correlation graph neural network. The proposed model firstly employs graph convolution, which performs Laplace transforms instead of the traditional convolution, to capture the potential spatial dependencies from the nodes' relationship and historical time series better. The channel-wise attention makes the original concentrated weights within a region constructed by adjacency matrix disperse to all input nodes, which distinguishes the nodes’ contributions and generates high dimensional spatial features. Long short-term memory is applied to extract temporal correlation from the high dimensional spatial features. The model has ability to excavate the full potential of spatial-temporal dependencies from multiple wind nodes to the utmost. Experiments select 120 wind nodes in the China sea for prediction. The results show that the proposed model can be very competitive with state-of-the-art methods and holds great performance on multi-node and multi-step wind speed forecasting. •A graph optimization model is proposed for multi-node offshore wind speed prediction.•The GCN module can capture multiple wind nodes relationships' spatial correlation.•Channel-wise attention distinguishes the nodes' contributions to spatial dimensions.•The parallel LSTMs is specifically adopted to further integrate time dependencies.•The proposed STGN can track actual wind speed tendencies and maintain stability.