Wavelet-based data compression of power system disturbances using the minimum description length criterion

This paper introduces a compression technique for power disturbance data via discrete wavelet transform (DWT) and wavelet packet transform (WPT). The data compression leads to a potential application for remote power protection and power quality monitoring. The compression technique is performed thr...

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Bibliographic Details
Published in:IEEE transactions on power delivery 2002-04, Vol.17 (2), p.460-466
Main Authors: Hamid, E.Y., Kawasaki, Z.-I.
Format: Article
Language:English
Subjects:
Coding
Criteria
Data compression
Discrete wavelet transforms
Disturbances
Filters
Grounds
Longitudinal waves
Power quality
Power system protection
Power systems
Remote monitoring
Signal reconstruction
Signal resolution
Wavelet
Wavelet packets
Wavelet transforms
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Summary:This paper introduces a compression technique for power disturbance data via discrete wavelet transform (DWT) and wavelet packet transform (WPT). The data compression leads to a potential application for remote power protection and power quality monitoring. The compression technique is performed through signal decomposition up to a certain level, thresholding of wavelet coefficients, and signal reconstruction. The choice of which wavelet to use for the compression is of critical importance, because the wavelet affects reconstructed signal quality and the design of the system as a whole. The minimum description length (MDL) criterion is proposed for the selection of an appropriate wavelet filter. This criterion permits selection not only of the suitable wavelet filter but also the best number of wavelet retained coefficients for signal reconstruction. The experimental study has been carried out for a single-phase to ground fault event, and the data compression results of using the suitable wavelet filter show that the compression ratios are less than 11 % and are reduced to more than a half of that percentage value by implementing an additional lossless coding.
ISSN:0885-8977
1937-4208
DOI:10.1109/61.997918