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Powerline fault traveling wave head precision positioning method based on S-transform

A technology for precise positioning and transmission lines, applied in the direction of fault location, complex mathematical operations, etc., can solve the problems of inaccurate sampling points and inaccurate location of wave head time

Active Publication Date: 2009-03-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the engineering application of traveling wave head detection, the cubic B-spline wavelet is considered to be a wavelet base with good signal singularity detection ability, and mathematical morphology also constructs unique flat structural elements with different origins, combined with multi-resolution morphology Gradient, to achieve a good effect of signal singularity detection, but these methods are still unable to accurately locate the wave head moment because they cannot be accurate to the sampling point when reflecting the wave head position

Method used

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  • Powerline fault traveling wave head precision positioning method based on S-transform
  • Powerline fault traveling wave head precision positioning method based on S-transform
  • Powerline fault traveling wave head precision positioning method based on S-transform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] (1) Obtain the traveling wave data source of the transmission line fault: When the line fails, the fault traveling wave analysis device is activated to perform fast and high sampling rate (1MHz) wave recording, and the traveling wave data file is truncated, see Figure 4 (a) Curve, select 1.5ms data time window before and after the fault;

[0074] (2) Perform S transformation on the original truncated data selected in step (1) according to equations (8), (9), (10):

[0075] S [ m , n ] = Σ k = 0 N - 1 X [ n + k ] e - 2 π 2 k ...

Embodiment 2

[0085] In this example, there is no noise interference, and the steps to distinguish between wave heads and noise may not be performed, but traveling wave heads of different polarities are included.

[0086] (1) Obtain the fault traveling wave data source of the transmission line: when the line fails, the fault traveling wave analysis device is activated to perform fast and high sampling rate (1MHz) wave recording;

[0087] (2) Truncate the traveling wave data file, see figure 1 (a) Curve, select 1.5ms data time window before and after the fault;

[0088] (3) Calculate according to the same formulas (8), (9) and (10) as in Example 1, to obtain the S transformation result matrix S[m, n] of the original truncated data selected in step (2), and its elements Take the modulus value to obtain the S transform modulus matrix;

[0089] (4) Select the 750th, 45th, and 15th rows of the S transform modulus matrix in step (3). According to the same formula (12) as in Example 1, the frequency ...

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Abstract

The invention relates to an S-transform based transmission fault traveling wave heat positioning method and belongs to the technical field of relay protection of a power system. The method comprises the following steps: carrying out data window truncation of a fault traveling wave signal and S-transform of a small quantity of key data, with amplitude-time-frequency information of the traveling wave signal expressed by an S-transform modular matrix; basically filtering influence of noise and initially determining the position of a head of the traveling wave according the different performance of the head of the traveling wave and the noise in different frequency range; intensively inspecting an amplitude-time graph at a point of the highest frequency in which a point of maximum amplitude represents a point of the most intensive vibration of the head of the traveling wave, namely a point of the arrival time of the head of the traveling wave; and marking polarity information of the head of the traveling wave according to the characteristics of an original signal near the point of the arrival time of the head of the traveling wave. Principle analysis and simulation data and engineering data verification show that the method can accurately indicate the arrival time of the head of the fault traveling wave and is advantageous to the prior method.

Description

Technical field [0001] The invention relates to a method for accurately positioning the traveling wave head of a transmission line fault based on S transformation, and belongs to the technical field of power system relay protection. Background technique [0002] Compared with the traditional fault location technology based on power frequency quantity, the fault location technology based on traveling wave [1-6] The accuracy is high, and it is not easily affected by the system operation mode, transition resistance, CT saturation, and line distributed capacitance. Therefore, it has become one of the hot research topics in the field of relay protection. The precise positioning of the arrival time of the traveling wave head is one of the key technologies to improve the accuracy of ranging. Wavelet analysis [4，7，8] , Mathematical Morphology [9-10] And the combination of wavelet and mathematical morphology [12] The application of the method in the positioning of the arrival time of the ...

Claims

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Application Information

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IPC IPC(8): G01R31/08G06F17/14
Inventor 束洪春程春和王永治董俊刘志坚刘可真孙士云唐岚邱革非
Owner KUNMING UNIV OF SCI & TECH
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