Research Article
Multistep Wind Speed Forecasting Based on a Hybrid Model of VMD and Nonlinear Autoregressive Neural Network
Table 1
Central frequency (ωk) of IMF at different k values.
| | k | IMF 1 | IMF 2 | IMF 3 | … | IMF 16 | IMF 17 | IMF 18 | IMF 19 | IMF 20 | IMF 21 |
| | 2 | 5.55 | 606.58 | — | — | — | — | — | — | — | — | | 3 | 3.67 | 366.12 | 948.61 | — | — | — | — | — | — | — | | … | … | … | … | — | — | — | — | — | — | — | | 16 | 0.47 | 78.32 | 204.12 | … | 4661.06 | — | — | — | — | — | | 17 | 0.47 | 78.20 | 203.67 | … | 4155.91 | 4712.45 | — | — | — | — | | 18 | 0.47 | 78.04 | 203.01 | … | 3688.31 | 4164.82 | 4713.35 | — | — | — | | 19 | 0.47 | 77.92 | 202.55 | … | 3652.16 | 4070.63 | 4499.30 | 4851.58 | — | — | | 20 | 0.47 | 77.85 | 202.32 | … | 3284.23 | 3674.42 | 4077.48 | 4493.20 | 4845.27 | — | | 21 | 0.47 | 77.77 | 202.07 | … | 2974.13 | 3299.55 | 3684.33 | 4083.22 | 4493.84 | 4844.38 |
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