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Electric energy quality detection method on basis of generalized morphological open-close and close-open wavelet transform

A technology of wavelet transform and power quality, applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems that positive pulses cannot be eliminated well, and negative pulses cannot be eliminated well by closed elements.

Active Publication Date: 2015-04-08
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

However, the opening-closing and closing-opening operations based on a single structural element also have deficiencies: for the opening-closing operation, the closing element cannot eliminate the negative pulse increased by the opening operation; for the closing-opening operation, the opening operation cannot eliminate Positive pulse augmented by closing operation

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  • Electric energy quality detection method on basis of generalized morphological open-close and close-open wavelet transform
  • Electric energy quality detection method on basis of generalized morphological open-close and close-open wavelet transform
  • Electric energy quality detection method on basis of generalized morphological open-close and close-open wavelet transform

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Embodiment

[0113] This embodiment discloses a power quality detection method based on generalized morphological open-close and closed-open wavelet transform, such as figure 1 As shown, the steps of the power quality detection method in this embodiment are as follows:

[0114] 1) Collect the signal that needs to be tested for power quality, and normalize the signal to the interval [-1,1] to obtain the normalized signal x of the power quality detection signal 0 , where x 0 (n) is x 0 The sampling value at the sampling point n, n=1, 2, 3...; the power quality detection signal collected in this embodiment is a voltage signal or a current signal.

[0115] 2) For the power quality detection signal x collected in step 1) 0 Carry out the first layer of generalized morphological opening and closing and closing and opening wavelet transform processing, and then extract the signal features of notch and transient oscillation from the detail signals processed by the first layer of generalized morp...

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Abstract

The invention discloses an electric energy quality detection method on the basis of generalized morphological open-close and close-open wavelet transform, which comprises the following steps: 1, acquiring a signal for electric energy quality detection and carrying out normalization; 2, carrying out a first layer of generalized morphological open-close and close-open wavelet transform processing on the normalized sginal and then extracting signal characteristics of a trapped wave and transient oscillation; 3, carrying out a second layer of generalized morphological open-close and close-open wavelet transform processing on an approximate signal obtained after the first layer of generalized morphological open-close and close-open wavelet transform processing and then extracting signal characteristics of a harmonic wave; 4, carrying out a third layer of generalized morphological open-close and close-open wavelet transform processing on an approximate signal obtained after the second layer of generalized morphological open-close and close-open wavelet transform processing and then extracting signal characteristics of voltage swell, temporary voltage drop and voltage momentary interruption; 5, according to the extracted signal characteristics, judging electric energy quality. The electric energy quality detection method has the advantages of small calculated amount, high response speed and strong resistance to noise interference.

Description

technical field [0001] The invention relates to a power quality detection method, in particular to a power quality detection method based on generalized morphological open-close and closed-open wavelet transform. Background technique [0002] In the past few decades, the power quality problem has caused huge economic losses in the power system, and the power quality problem has been paid more and more attention by researchers and engineers. When the current or voltage signal in the power system is disturbed by power quality problems, the amplitude and frequency components of the current or voltage signal will change. According to the characteristics of different changes, we can divide common power quality problems into two categories: first, power quality problems mainly based on amplitude changes, such as voltage swells, voltage sags, and voltage instantaneous interruptions; second Types of power quality problems that are dominated by changes in frequency components, such ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00G06F19/00
Inventor 吴青华张银季天瑶李梦诗
Owner SOUTH CHINA UNIV OF TECH
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