To enhance the accuracy of short-term wind turbine power forecasting
a forecasting model based on variational mode decomposition (VMD) is proposed. The model constructs a long-term trend forecasting module (LTTFM) and a short-term periodic forecasting module (STPFM) for multi-time scale classification forecasting. Firstly
considering the non-stationarity of the wind power sequence
the original power sequence is decomposed by VMD
and the intrinsic mode functions are categorized into low-frequency components
high-frequency components
and residuals based on their correlation. Then
according to the characteristics of each component
different forecasting modules are designed. Long-term trend forecasting module based on GRU is constructed for the forecasting of low-frequency components. Short-term periodic forecasting module containing dimensional transformation and 2D-CNN is constructed for the forecasting of high-frequency components and residuals. Finally
the final power is obtained by synthesizing the forecasting results of each component. The proposed model is verified using actual operation data from a wind turbine
and the results show that the mean absolute error (MAE) of the proposed model is reduced by 34.9%-44.1% compared to commonly used models
indicating that the proposed model has a higher forecasting accuracy.
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