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Electric energy quality disturbance detection method and device based on matching pursuit sparse decomposition

A technology of power quality disturbance and sparse decomposition, applied in measurement devices, measurement of electrical variables, measurement of electricity, etc., can solve problems such as differences in detection accuracy, and achieve the effects of improved calculation speed, intuitive data visualization, and easy manual matching operations.

Inactive Publication Date: 2019-09-17
NORTHEAST GASOLINEEUM UNIV
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Problems solved by technology

[0004] However, there are only basic theories in the existing technology. In reality, different detection companies use different detection methods, and there are large differences in detection accuracy. Therefore, a complete and optimized power quality disturbance detection scheme is urgently needed

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  • Electric energy quality disturbance detection method and device based on matching pursuit sparse decomposition
  • Electric energy quality disturbance detection method and device based on matching pursuit sparse decomposition
  • Electric energy quality disturbance detection method and device based on matching pursuit sparse decomposition

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Embodiment Construction

[0025] The present invention is described further below:

[0026] refer to figure 1 , figure 2 and image 3 , this power quality disturbance detection method based on matching pursuit sparse decomposition includes the following steps:

[0027] S1: Establish a redundant dictionary, use a set of function waveforms with extensive time-frequency local characteristics as a redundant dictionary in the sparse decomposition, and each waveform as an atom a in the redundant dictionary γ (t), the method of establishing a redundant dictionary is:

[0028] A1: Take the direction of the waveform toggling amplitude as the Y-axis direction, and the wave propagation direction as the X-axis direction. In column A of the Excel sheet, input the X-axis coordinate values ​​corresponding to the first waveform along the propagation direction. In the Excel sheet, In column B, input the Y-axis coordinate values ​​corresponding to the first waveform along the amplitude direction in turn to form the...

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Abstract

The invention relates to an electric energy quality disturbance detection method and device based on matching pursuit sparse decomposition. The electric energy quality disturbance detection method based on matching pursuit sparse decomposition comprises the following steps: 1, establishing a redundant dictionary; 2, carrying out matching pursuit decomposition; 3, carrying out discretization on atomic parameters; and 4, carrying out power quality disturbance parameter detection based on an MP algorithm, carrying out inner product operation on the residual error of the signal and all atoms in the discrete Gabor dictionary in a traversal manner in each iteration, and finding out a matched atom with the maximum absolute value of the residual error inner product. The fast operation of MP is realized by combining the inner product recursion calculation, the synthetic dictionary is designed, the extraction of the power quality disturbance matching waveform and the fast detection of parameters are finally realized, the calculation speed is greatly improved, the disturbance waveform is extracted from the white noise by adopting less iteration, and the good anti-noise performance is shown.

Description

technical field [0001] The invention relates to a method for detecting and monitoring power quality disturbances, in particular to a method and device for detecting power quality disturbances based on matching pursuit sparse decomposition. Background technique [0002] During the use of electrical equipment, electromagnetic waves will be emitted to the external space to affect the working quality of other electrical equipment. With the increasing use of electrical equipment, it is very important to detect and monitor power quality disturbances. [0003] In recent decades, researchers in related fields at home and abroad have published a large number of documents on the sources, hazards, detection and suppression of harmonics and interharmonics. However, there are still many difficulties in the accurate measurement of harmonic and inter-harmonic parameters. Therefore, the detection of harmonics and inter-harmonics has been an important research direction in power quality moni...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/14G06F17/11G01R31/00
CPCG06F17/14G06F17/11G01R31/00
Inventor 李占友陈雷曹雪张利国李红霞贾茉
Owner NORTHEAST GASOLINEEUM UNIV