Research Article
Wind Speed Forecasting by Wavelet Neural Networks: A Comparative Study
Table 1
Model parameters of the three wavelet neural networks and BP networks.
| | Test station | Model | Wavelet preprocessing module | Neural network prediction module | Wavelet
function | Decomposition
coefficients | Structure of network | Transfer function of hidden layer | Transfer function of output layer | Training algorithm |
| | Test station 1 |
BPNN | | | 4-12-1* | tansig | purelin | trainlm | |
CWNN | | | 4-9-1 | Morlet | purelin | trainlm | |
LWNN | | , , , | : 3-11-1 | tansig | purelin | trainlm | | db4 | : 4-7-1 | tansig | purelin | trainlm | | | : 4-12-1 | tansig | purelin | trainlm | | | : 4-12-1 | tansig | purelin | trainlm | |
LCWNN | | , , , | : 3-9-1 | tansig | purelin | trainlm | | db4 | : 4-7-1 | tansig | purelin | trainlm | | | : 4-7-1 | tansig | purelin | trainlm | | | : 4-12-1 | tansig | purelin | trainlm |
| | Test station 2 |
BPNN | | | 4-11-1 | tansig | purelin | trainlm | |
CWNN | | | 3-8-1 | Morlet | purelin | trainlm | |
LWNN | | , , | : 3-8-1 | tansig | purelin | trainlm | | db3 | : 4-7-1 | tansig | purelin | trainlm | | | : 4-12-1 | tansig | purelin | trainlm | |
LCWNN | | , , | : 3-9-1 | tansig | purelin | trainlm | | db3 | : 3-10-1 | tansig | purelin | trainlm | | | : 4-11-1 | tansig | purelin | trainlm |
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*
m-n-p denotes structure pattern of neural network. m, n, p are the numbers of the input, the hidden, and the output layer nodes, respectively.
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