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Wind speed big data forecasting using time-variant multi-resolution ensemble model with clustering auto-encoder
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DOI：10.1016/j.apenergy.2020.115975.png)
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摘要
En 中文
The fluctuation of wind speed brings difficulty for wind energy utilization. Wind speed forecasting can improve safety of wind power integration. To better forecast fluctuating wind speed, a time-variant multi-resolution ensemble model is proposed, which contains three stages. In stage I, the proposed model uses low-resolution and high-resolution datasets to build base forecasting models. In this manner, the additional fluctuation information in the high-resolution big data is used for better forecasting. In stage II, the wind speed is clustered with a clustering auto-encoder algorithm, and an ensemble weight set is obtained by optimizing weights on each cluster respectively. The clustering auto-encoder algorithm can analyze the nonlinear fluctuation, and generate clustering-friendly features. In stage III, by switching ensemble weights over time, the time-variant ensemble forecasting results can be obtained by combining the base models. The time-variant structure can track the changes of fluctuating characteristics over time, further improving forecasting performance. Four groups of real wind speed high-resolution big data with 51,840 sample points and the corresponding low-resolution data with 8640 sample points are utilized for case study. The forecasting results indicate: (a) the proposed model can effectively predict the wind speed. Taking 1-step forecasting as an example, the mean absolute errors of the proposed model for dataset #1, #2, #3 and #4 are 0.6318 m/s, 0.6957 m/s, 0.6121 m/s and 0.6175 m/s, respectively; (b) the proposed model outperforms other benchmark models.
Keyword:
Wind speed forecasting
Time series multi-step forecasting
Deep learning
Time-variant model
Big data forecasting
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期刊
IF:
11
论文数:
2.6W
被引数:
17.8W
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