Voltage sag source identification method and identification device based on variational mode decomposition

A technology of variational mode decomposition and voltage sag source, which is applied to pattern recognition in signals, character and pattern recognition, complex mathematical operations, etc., and can solve problems such as large losses for industrial users and society

Active Publication Date: 2019-10-22
STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When an industrial process (or equipment) is interrupted (or fails) due to a voltage sag, the losses to industrial users and society are enormous

Method used

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  • Voltage sag source identification method and identification device based on variational mode decomposition
  • Voltage sag source identification method and identification device based on variational mode decomposition
  • Voltage sag source identification method and identification device based on variational mode decomposition

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Embodiment 1

[0090] First of all, the technical problem to be solved by the present invention is to identify the source of voltage sags. Before understanding the technical logic of the present invention, it is necessary to have a certain understanding of the existing technology in the field to solve the identification of voltage sag sources.

[0091] The current identification of voltage sag sources mainly uses signal processing, deep learning and the combination of the two methods.

[0092] (1) The method of signal processing:

[0093] The voltage sag signal is obtained by S-transformation to obtain the modulus-time-frequency matrix, and the global template is obtained by scale transformation. From the global template, the specific part that can best reflect the source of this type of sag is selected as the only standard template. Finally, by solving the unknown temporary The similarity between the local template of the sag source signal and the standard template is used to identify the t...

Embodiment 2

[0157] Since the present invention has summarized an identification method in Embodiment 1, it can be directly packaged according to the above-mentioned parameters, so as to directly obtain an identification device adapted to the above-mentioned method.

[0158] Voltage sag source identification device based on variational mode decomposition,

[0159] include:

[0160] The input device for obtaining the original voltage sag signal;

[0161] A construction device for constructing a variational modal decomposition model. When constructing a variational modal decomposition model, the preset decomposition scale K value is encapsulated as 6;

[0162] Processing output device for 6 modal components obtained by variational modal decomposition processing;

[0163] An acquisition device for obtaining the IMF No. 6 modal component, the IMF No. 3 modal component, and the IMF No. 4 modal component among the six modal components;

[0164] An extraction device for extracting the sag star...

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Abstract

The invention discloses a voltage sag source identification method and identification device based on variational mode decomposition. The identification method comprises the following steps: acquiringan original voltage sag signal from an electric energy quality monitoring wave recording device; normalizing the original voltage sag signal to obtain an original time domain signal; carrying out variational modal decomposition on the original time domain signal to obtain K modal components; screening out a modal component IMF N which can represent different sag sources at the same time from theK modal components; and according to the waveform of the unique modal component of each type of sag source after the sag starting moment T of the modal component IMF N, corresponding to the characteristic of the unique modal component of each type of sag source, carrying out identification.

Description

technical field [0001] The invention relates to the field of grid power quality detection and discrimination, in particular to a voltage sag source identification method based on variational mode decomposition. Background technique [0002] Voltage sag (voltage sag) refers to the short-term voltage fluctuation phenomenon that the effective value of voltage drops to between 0.1 and 0.9 p.u under power frequency conditions and lasts for 0.5 cycles to 1 minute. Voltage sag is an inevitable short-term disturbance phenomenon during the normal operation of the system. Faults in the upper transmission network, remote distribution network and local distribution network, transformer excitation, starting of large motors, and switching of loads cause voltage sags The main reason, while the system impedance, fault impedance, transformer parameters, protection and relay protection installation and parameter settings, etc., also have an important impact on the voltage sag. [0003] Howev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K9/00G06K9/62G06F17/11
CPCG06F17/11G06F2218/02G06F2218/12G06F18/2134
Inventor 徐琳李训张华汪颖
Owner STATE GRID SICHUAN ELECTRIC POWER CORP ELECTRIC POWER RES INST
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