A novel hybrid model based on extreme learning machine, k-nearest neighbor regression and wavelet denoising applied to short-term electric load forecasting

Journal article


Li, Weide, Kong, Demeng and Wu, Jinran. (2017). A novel hybrid model based on extreme learning machine, k-nearest neighbor regression and wavelet denoising applied to short-term electric load forecasting. Energies. 10(5), p. Article 694. https://doi.org/10.3390/en10050694
AuthorsLi, Weide, Kong, Demeng and Wu, Jinran
Abstract

Electric load forecasting plays an important role in electricity markets and power systems. Because electric load time series are complicated and nonlinear, it is very difficult to achieve a satisfactory forecasting accuracy. In this paper, a hybrid model, Wavelet Denoising-Extreme Learning Machine optimized by k-Nearest Neighbor Regression (EWKM), which combines k-Nearest Neighbor (KNN) and Extreme Learning Machine (ELM) based on a wavelet denoising technique is proposed for short-term load forecasting. The proposed hybrid model decomposes the time series into a low frequency-associated main signal and some detailed signals associated with high frequencies at first, then uses KNN to determine the independent and dependent variables from the low-frequency signal. Finally, the ELM is used to get the non-linear relationship between these variables to get the final prediction result for the electric load. Compared with three other models, Extreme Learning Machine optimized by k-Nearest Neighbor Regression (EKM), Wavelet Denoising-Extreme Learning Machine (WKM) and Wavelet Denoising-Back Propagation Neural Network optimized by k-Nearest Neighbor Regression (WNNM), the model proposed in this paper can improve the accuracy efficiently. New South Wales is the economic powerhouse of Australia, so we use the proposed model to predict electric demand for that region. The accurate prediction has a significant meaning.

Keywordselectric load; predict; ELM; KNN regression; wavelet denoising
Year2017
JournalEnergies
Journal citation10 (5), p. Article 694
PublisherMultidisciplinary Digital Publishing Institute (MDPI AG)
ISSN1996-1073
Digital Object Identifier (DOI)https://doi.org/10.3390/en10050694
Scopus EID2-s2.0-85024400504
Open accessPublished as ‘gold’ (paid) open access
Page range1-16
FunderNational Natural Science Foundation of China (NSFC)
Publisher's version
License
File Access Level
Open
Output statusPublished
Publication dates
Online16 May 2017
Publication process dates
Accepted09 May 2017
Deposited07 Jul 2023
Grant ID41571016
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