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A Method for Recognition of Power Quality Composite Disturbance Using Two-dimensional Morphological Noise Reduction

A technology of power quality and morphology, which is applied in the direction of measuring electrical variables, character and pattern recognition, measuring electricity, etc., can solve problems such as difficult design of decision tree classification system, different optimal classification thresholds, etc., and achieve good anti-noise performance and Robustness, good real-time performance, and the effect of reducing the influence of high-frequency noise

Active Publication Date: 2017-09-05
国网吉林省电力有限公司经济技术研究院 +2
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Problems solved by technology

Due to noise interference, the optimal classification thresholds of each node of the decision tree under different noise levels are different, so it is difficult to design a decision tree classification system that meets different noise levels
Similar research results can only be applied in the environment with high signal-to-noise ratio

Method used

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  • A Method for Recognition of Power Quality Composite Disturbance Using Two-dimensional Morphological Noise Reduction
  • A Method for Recognition of Power Quality Composite Disturbance Using Two-dimensional Morphological Noise Reduction
  • A Method for Recognition of Power Quality Composite Disturbance Using Two-dimensional Morphological Noise Reduction

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Embodiment Construction

[0065] The present invention is a method for recognizing composite power quality disturbances using two-dimensional morphological noise reduction, comprising the following steps:

[0066] 1) Power quality disturbance signal acquisition

[0067] Use the fault recorder and secondary equipment in the substation to collect and record the relevant disturbance signals. For the disturbance signals that cannot be collected, refer to the national standards "GB / T 12325-2008 Power Quality Supply Voltage Deviation", "GB / T T15543-2008 Power Quality Three-phase Voltage Unbalance", "GB / T 12326-2008 Power Quality Voltage Fluctuation and Flicker", "GB / T 14549-1993 Power Quality Harmonics of Public Power Grid", randomly generated by MATLAB 7.0 software ; MATLAB 7.0 software is the public software familiar to those skilled in the art;

[0068] 2) Perform multi-resolution fast S-transform on the disturbance signal

[0069] Considering the distribution of existing disturbance features comprehens...

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Abstract

The invention is a disturbance signal identification method using two-dimensional morphological filtering, which is characterized in that it includes power quality disturbance signal acquisition, multi-resolution fast S-transformation for the disturbance signal, two-dimensional morphological noise reduction, and disturbance signal feature extraction And the design of decision tree classifier to classify samples has the advantages of scientific and reasonable, simple and easy, no training, good real-time performance, can meet the requirements of field application, strong anti-noise ability, and high recognition accuracy.

Description

technical field [0001] The present invention is a power quality composite disturbance identification method using two-dimensional morphology noise reduction, which is applied to automatic classification and positioning of power quality transient disturbances, online monitoring and evaluation of equipment status, and power quality control in high-noise industrial environments. Background technique [0002] With the widespread application of power electronic equipment and the massive access of distributed power sources in recent years, the impact of power quality problems has become increasingly prominent. Accurate identification of power quality transient disturbances is the premise and foundation of power quality disturbance governance and power quality analysis. In recent years, researchers at home and abroad have done a lot of work on disturbance identification and achieved good identification results. However, the accuracy of existing disturbance recognition methods is su...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00G06T7/00G06K9/62
Inventor 黄南天蔡国伟张卫辉张书鑫
Owner 国网吉林省电力有限公司经济技术研究院
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