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...
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Published in | Electric power systems research Vol. 48; no. 2; pp. 133 - 140 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier B.V
15.12.1998
Elsevier |
Subjects | |
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Abstract | 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. |
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AbstractList | 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. |
Author | Makram, Elham B. Zheng, Tongxin |
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Keywords | Voltage flicker Wavelet transform Power quality Multiresolution analysis Wavelet transformation Voltage Problem solving Power supply Experimental study Flicker Quality management |
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PWRD contributor: fullname: Santoso – volume: 10 start-page: 483 issue: 1 year: 1995 ident: 10.1016/S0378-7796(98)00099-6_BIB3 article-title: Investigation of transmission system voltage flicker due to multiple AC and DC furnace operations publication-title: IEEE Trans. PWRD contributor: fullname: Mendis – volume: 12 start-page: 1250 issue: 3 year: 1997 ident: 10.1016/S0378-7796(98)00099-6_BIB14 article-title: Power quality disturbance data compression using wavelet transform methods publication-title: IEEE Trans. PWRD contributor: fullname: Santoso – year: 1992 ident: 10.1016/S0378-7796(98)00099-6_BIB7 contributor: fullname: Chui – volume: 10 start-page: 116 issue: 1 year: 1995 ident: 10.1016/S0378-7796(98)00099-6_BIB4 article-title: Digital multirate algorithms for measurement of voltage, current, power and flicker publication-title: IEEE Trans. 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Snippet | 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... |
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SubjectTerms | 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 |
Title | Wavelet representation of voltage flicker |
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