Improved dual-tree complex wavelet transform denoising method
An improved dual-tree complex wavelet technology, which is applied in the directions of instruments, calculations, character and pattern recognition, etc., can solve the problems of discontinuity in the hard threshold method and constant deviation in the soft threshold method, so as to avoid constant deviation, simplify the amount of calculation, The effect of improving the accuracy of analysis
Active Publication Date: 2021-11-02
ZHAOTONG POWER SUPPLYING BUREAU OF YUNNAN POWER GRID
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[0002] Power quality signal processing of power equipment, the traditional wavelet threshold denoising method, including soft threshold method and hard threshold method, but the hard threshold method is discontinuous, while the soft threshold method has a constant deviation
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[0041] The present invention will be further described in detail below in conjunction with the examples. The examples are only for illustrating the present invention and should not be construed as limiting the scope of the present invention.
[0042] Those skilled in the art will understand that the following examples are only for illustrating the present invention and should not be considered as limiting the scope of the present invention. If no specific technique or condition is indicated in the examples, it shall be carried out according to the technique or condition described in the literature in this field or according to the product specification. The materials or equipment used are not indicated by the manufacturer, and they are all conventional products that can be obtained through purchase.
[0043] The nouns that the present invention relates to are as follows:
[0044] Power quality disturbance signal (power quality disturbance signal, PQDS);
[0045] Improved th...
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The invention discloses an improved dual-tree complex wavelet transform denoising method, which belongs to the technical field of electric power quality signal processing of electric equipment. The method includes the steps of power quality signal acquisition, filter processing, dual-tree complex wavelet transform, improved threshold function, and combination of improved threshold function and dual-tree complex wavelet. The method of the present invention effectively analyzes and processes common parameter fluctuations of power quality, makes targeted improvements, effectively processes voltage fluctuations, frequency changes, load imbalances, flicker and other factors to power quality noise, and greatly simplifies calculations At the same time, the method of the present invention greatly improves the quality of the power quality signal, reduces the influence of noise on the operation of later equipment and signal processing, and lays a solid foundation for further processing and analysis later.
Description
technical field [0001] The invention belongs to the technical field of power quality signal processing of electric equipment, and in particular relates to an improved double-tree complex wavelet transform denoising method. Background technique [0002] For power quality signal processing of power equipment, wavelet threshold denoising methods are traditionally used, including soft threshold method and hard threshold method, but the hard threshold method is discontinuous, while the soft threshold method has a constant deviation. [0003] The traditional wavelet threshold denoising method is to use the multi-scale characteristics of wavelet analysis. Firstly, wavelet transform is performed on the noisy signal, and then the obtained wavelet coefficients are subjected to threshold processing, and then the processed wavelet coefficients are reconstructed. In this way, Signal after denoising. [0004] The specific steps for denoising the noisy transponder signal are as follows: ...
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IPC IPC(8): G06K9/00
CPCG06F2218/04
Inventor 姜毅张国荣张兴霖李锐
Owner ZHAOTONG POWER SUPPLYING BUREAU OF YUNNAN POWER GRID