Wavelet representation of voltage flicker

Voltage flicker can be considered as a voltage magnitude modulated signal with a frequency ranging from 0.5 to 30 Hz. Wavelet transform is a powerful tool to analyze this kind of nonstationary, wide-range frequency signal. The wavelet representation of voltage flicker signal is presented in this pap...

Full description

Saved in:
Bibliographic Details
Published inElectric power systems research Vol. 48; no. 2; pp. 133 - 140
Main Authors Zheng, Tongxin, Makram, Elham B.
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 15.12.1998
Elsevier
Subjects
Applied sciences
Disturbances. Regulation. Protection
Electrical engineering. Electrical power engineering
Electrical power engineering
Exact sciences and technology
Multiresolution analysis
Operation. Load control. Reliability
Power networks and lines
Power quality
Voltage flicker
Wavelet transform
Voltage flicker
Wavelet transform
Power quality
Multiresolution analysis
Wavelet transformation
Voltage
Problem solving
Power supply
Experimental study
Flicker
Quality management
Online AccessGet full text

Cover

More Information
Summary:Voltage flicker can be considered as a voltage magnitude modulated signal with a frequency ranging from 0.5 to 30 Hz. Wavelet transform is a powerful tool to analyze this kind of nonstationary, wide-range frequency signal. The wavelet representation of voltage flicker signal is presented in this paper. The proposed scheme is implemented in three steps. Firstly, a low-pass demodulation filter is designed to find the magnitude of 60 Hz component. Accordingly, a high degree of accuracy may be achieved and the effect of the transient, harmonics and white noise may be eliminated. Secondly, a multiresolution analysis (MRA) scheme that is an orthonormal wavelet transform, can then be applied to decompose the demodulated signal into several components according to the scales. Components at high scale can be considered as white noise, while components at the low scale represent the voltage fluctuation. The smooth version left by the MRA scheme represents the DC component. Finally, the voltage flicker level can be estimated by the wavelet coefficients at different scales, which give the time and frequency information. Numerical examples are also presented in this paper to show the efficiency of the proposed scheme.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0378-7796
1873-2046
DOI:10.1016/S0378-7796(98)00099-6