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Energies 2011, 4(7), 1087-1101; doi:10.3390/en4071087
Article

Improved Bagging Algorithm for Pattern Recognition in UHF Signals of Partial Discharges

, * ,
 and
State Key Laboratory of Power Transmission Equipment& System Security and New Technology, College of Electrical Engineering, Chongqing University, Chongqing 400030, China
* Author to whom correspondence should be addressed.
Received: 25 April 2011 / Revised: 24 June 2011 / Accepted: 14 July 2011 / Published: 21 July 2011
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Abstract

This paper presents an Improved Bagging Algorithm (IBA) to recognize ultra-high-frequency (UHF) signals of partial discharges (PDs). This approach establishes the sample information entropy for each sample and the re-sampling process of the traditional Bagging algorithm is optimized. Four typical discharge models were designed in the laboratory to simulate the internal insulation faults of power transformers. The optimized third order Peano fractal antenna was applied to capture the PD UHF signals. Multi-scale fractal dimensions as well as energy parameters extracted from the decomposed signals by wavelet packet transform were used as the characteristic parameters for pattern recognition. In order to verify the effectiveness of the proposed algorithm, the back propagation neural network (BPNN) and the support vector machine (SVM) based on the IBA were adopted in this paper to carry out the pattern recognition for PD UHF signals. Experimental results show that the proposed approach of IBA can effectively enhance the generalization capability and also improve the accuracy of the recognition for PD UHF signals.
Keywords: power transformer; partial discharge; ultra-high-frequency (UHF) detection; sample information entropy; re-sampling power transformer; partial discharge; ultra-high-frequency (UHF) detection; sample information entropy; re-sampling
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Jiang, T.; Li, J.; Zheng, Y.; Sun, C. Improved Bagging Algorithm for Pattern Recognition in UHF Signals of Partial Discharges. Energies 2011, 4, 1087-1101.

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