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High-voltage DC transmission line lightning interference recognition method based on S transform

A technology of transmission line and identification method, which is applied in the direction of fault location and fault detection according to conductor type, etc., can solve the problems of high resistance fault affecting threshold value setting, lack of anti-interference sensitivity, etc., and achieves high practical value, fast action speed, Reliable effect

Inactive Publication Date: 2018-11-27
STATE GRID TIANJIN ELECTRIC POWER +1
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AI Technical Summary

Problems solved by technology

Although data synchronization at both ends is not required, high-impedance faults affect threshold setting
[0006] It can be seen that the existing research on the identification of lightning strikes on HVDC transmission lines does not have a method with strong anti-interference and high sensitivity

Method used

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  • High-voltage DC transmission line lightning interference recognition method based on S transform
  • High-voltage DC transmission line lightning interference recognition method based on S transform
  • High-voltage DC transmission line lightning interference recognition method based on S transform

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Embodiment Construction

[0030] Embodiments of the present invention are described in further detail below in conjunction with the accompanying drawings:

[0031] The invention discloses an S-transform-based lightning strike recognition method for a high-voltage direct current transmission line, which includes the following steps:

[0032] Step 1. Collect the voltage at the protection element connected to each pole of the DC transmission line in real time at the protection installation place on the rectification side of the system;

[0033] Step 2. After filtering the voltage at the protection element collected in step 1, extract the voltage fault component 5ms after the fault, and calculate the line-mode voltage;

[0034] Step 3. S-transform the line-mode voltage component at the installation place of the system protection to obtain its complex time-frequency S matrix, obtain the S-transform transient energy GL of the frequency band below 100 Hz and the S-transform transient energy GH of the frequenc...

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Abstract

The invention relates to a high-voltage DC transmission line lightning interference recognition method based on S transform. The method is technically characterized by comprising the following steps:1, voltage at a protection element connected with each pole of the DC transmission line is acquired in real time at a system rectifier side protection and mounting place; 2, after the voltage acquiredin the first step at the protection element is filtered, a voltage fault component 5 ms after fault is extracted, and line mode voltage is obtained through calculation; and 3, S transform is carriedout on the line mode voltage at the system protection and mounting place to obtain a complex-time frequency S matrix, the S transform transient energy and the GL under a frequency band below 100Hz andthe S transform transient energy and the GH under a frequency band above 200Hz are solved, the ratio k of the two is calculated, the k value and a lightning interference recognition criterion are compared, and whether the intraregional interference is lightning interference or intraregional fault can be recognized accurately. The lightning interference can be recognized accurately, the reliability is strong, the action speed is quick, the recognition is accurate, and engineering realization is easy.

Description

technical field [0001] The invention belongs to the technical field of high-voltage direct current transmission line maintenance, and relates to a lightning strike interference identification method for a high-voltage direct current transmission line, in particular to an S-transform-based lightning strike interference identification method for a high-voltage direct current transmission line. Background technique [0002] UHVDC transmission technology originated in the 1960s. Due to the development of converter equipment, HVDC transmission technology has been widely used in the world. It has stable power transmission, large transmission capacity, high transmission efficiency, and line self-protection capabilities. It has the advantages of being strong and capable of long-distance power transmission. It has become an important way for power transmission of large energy bases and interconnection of asynchronous power grids. It is also an important means for the country to develo...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCG01R31/085
Inventor 魏赟豪李钊
Owner STATE GRID TIANJIN ELECTRIC POWER
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