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A Power Quality Disturbance Detection Method Based on Adaptive Fitting and Enhanced Wavelet Packet Noise Reduction Analysis

A technology of power quality disturbance and detection method, which is applied in the direction of measuring electrical variables, measuring electricity, measuring devices, etc., can solve the problems of power quality monitoring signals containing background noise, difficulty in classifying and identifying disturbances, and judging severity.

Inactive Publication Date: 2021-12-10
BEIJING INSTITUTE OF GRAPHIC COMMUNICATION
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Problems solved by technology

In practice, power quality monitoring signals often contain background noise, which will cause great difficulties in the classification and identification of disturbances and the determination of their severity

Method used

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  • A Power Quality Disturbance Detection Method Based on Adaptive Fitting and Enhanced Wavelet Packet Noise Reduction Analysis
  • A Power Quality Disturbance Detection Method Based on Adaptive Fitting and Enhanced Wavelet Packet Noise Reduction Analysis
  • A Power Quality Disturbance Detection Method Based on Adaptive Fitting and Enhanced Wavelet Packet Noise Reduction Analysis

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Embodiment Construction

[0027] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] Such as figure 1 As shown, the process of detecting the power quality disturbance signal is mainly divided into the following two steps:

[0029] In the first step, the power supply voltage signal with a sample length of L is collected from the monitoring terminal, and four new wavelets constructed based on data fitting and lifting algorithms in the present invention are selected to perform two-layer redundant lifting wavelet packet decomposition. Each node signal x to be decomposed i,j (i=1,2 is the current decomposition level; j=1,K,2 i-1 , x i,j is the j-th node signal of the i-th layer) After decomposing, four groups of high-frequency detail signals d can be obtained correspondingly i,j,k (k=1,2,3,4); for the four, obtain the normalized l respectively according to the formula P Norm ||P i,j,k || p for:

[0030]

[0031] T...

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Abstract

The invention discloses a power quality disturbance detection method for self-adaptive fitting and improved wavelet packet noise reduction analysis. First, four different new wavelets are constructed, and the node signals to be decomposed are decomposed by redundant wavelet packets one by one; each The node signal is decomposed to obtain four groups of high-frequency detail signals, and the four groups are normalized respectively p Norm, the wavelet corresponding to the smallest norm value is the optimal wavelet matching the node signal; similarly until the decomposition of all node signals in each layer is completed, the modulus of the topmost high-frequency detail signal obtained by decomposing each layer is extremely large Values ​​are averaged to obtain the final judgment value of the disturbance start time and end time; secondly, for the noise-reduced signal from the disturbance start time to the whole cycle time corresponding to the power frequency, there will be no whole cycle of modulus maximum value The absolute value ratio of the voltage value at the moment and the voltage value at the start of the disturbance is taken, and the type and severity of the disturbance are determined according to the ratio result.

Description

technical field [0001] The invention belongs to the technical field of power quality detection, and in particular relates to a power quality disturbance detection method for self-adaptive fitting and upgrading wavelet packet noise reduction analysis. Background technique [0002] Electric energy, as a very important energy in the development of modern society and national economic life, its high-quality, reliable and stable transmission is of great significance to ensure the normal progress of all walks of life and people's daily life. [0003] However, with the increasingly complex equipment and environment, power quality issues have become increasingly prominent in recent years. In the power system, the power quality problems mainly include steady state and transient state, and the short-term voltage change in the transient power quality problem is becoming the most common typical problem in engineering practice. When a short-term voltage change occurs, the amplitude of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 阳子婧曹军威
Owner BEIJING INSTITUTE OF GRAPHIC COMMUNICATION