A Polar Coordinate Grid Search Method and System for Partial Discharge Source Location

A technology of grid search and discharge source, which is applied in the field of electric power, can solve the problems of direction angle error, large iterative solution error, and large calculation amount of grid search method, and achieve small calculation amount, high detection accuracy, and superior time performance Effect

Active Publication Date: 2020-06-05
GUANGDONG POWER GRID CO LTD DONGGUAN POWER SUPPLY BUREAU +1
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  • Description
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  • Application Information

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Problems solved by technology

Among them, when there is an error in the Newton iterative method, the error of the iterative solution is very large, even reaching the level of several kilometers, and it is related to the nature of the Newton iterative method itself, so it is difficult to change it by optimizing parameters
The grid search method has the disadvantages of large amount of calculation and errors in the direction angle.

Method used

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  • A Polar Coordinate Grid Search Method and System for Partial Discharge Source Location
  • A Polar Coordinate Grid Search Method and System for Partial Discharge Source Location
  • A Polar Coordinate Grid Search Method and System for Partial Discharge Source Location

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Example 1: Simulation of the positioning of partial discharge sources

[0063] First set the following parameters:

[0064] (1) if image 3 , there are four UHF sensors placed in

[0065] as well as

[0066] (2) A partial discharge source may arbitrarily appear within 1000 circles with a radius of 60 meters, and the center of the circle coincides with the center of the UHF sensor;

[0067] (3) The time delay used in the algorithm is based on the real time delay plus an obedience σ~U(-ε 0 ,ε 0 ) distributed random error, where ε 0 = 1 ns.

[0068] In the Cartesian coordinate system, in order to achieve the convergence condition that the search accuracy is 1 meter, if the search for a grid is used as a calculation, with the search condition set, the calculation amount can be between 675 and 1800, and more than 90% of the PD The source is positioned to within 2 degrees of error. In polar coordinates, by setting the initial search radius to 60 meters, the sear...

Embodiment 2

[0069] Example 2: On-site location of partial discharge sources

[0070] This algorithm is used to locate the partial discharge source in a 220Kv substation in China Southern Power Grid. like Figure 4 As shown, the antenna array is arranged on the roof of the central control room, and the coordinate distribution is S 1 (-7.8,3.75,1.2),S_2(7.8,3.75,1.2),S 3 (7.8,-3.75,-3.15) and S_4(7.8,-3.75,-3.15) array center point is o(0,0,0), and the creeping discharge on the insulator is used as the partial discharge source. A data set consisting of sixteen groups of time-delayed signals was acquired for algorithm calculation. The convergence angle in the polar coordinate system is 2 degrees, and the convergence side length in the rectangular coordinate system is 2 meters. Set the initial search radius to 30 meters in the polar coordinate system, the initial search angle to 40 degrees, the radius reduction multiple to 2, the angle reduction multiple to 5, and the Cartesian coordinate...

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Abstract

The present invention provides a polar coordinate grid search method and system for partial discharge source location. The method comprises the steps of: employing a system of polar coordinates to divide a search space into fan-shaped grids with radiuses of r, angles of [Theta] and quantities of nr; calculating a feature value array (A1, A2, ...An); and searching the minimum value Am in the feature value array, wherein the grid where the minimum value Am is located is a grid where a partial discharge point is located. It is determined whether the size of the grid where the minimum value Am islocated meets a precision demand or not, if yes, the grid where the minimum value Am is located is taken as the final solution, and if not, the grid where the minimum value Am is located is taken as anext space to be searched for grid division again. The present invention provides a method for accurate location of the partial discharge source on the angle through adoption of ultrahigh frequency time delay signals, the method is small in algorithm calculated amount and excellent in time performance, and has great improvement compared a current algorithm, and is simple and practicable, low in dependence on an external device environment and high in detection accuracy.

Description

technical field [0001] The invention relates to the field of electric power technology, in particular to a polar coordinate grid search method and system for locating a partial discharge source. Background technique [0002] Partial discharge is an important cause of insulation failure of power equipment. As an important part of insulation monitoring, partial discharge detection can detect defects and deterioration in the insulation medium of the equipment in time before the breakdown of the insulation medium occurs. Efficient partial discharge positioning is conducive to formulating maintenance plans, improving maintenance efficiency, reducing power outage maintenance time and preventing destructive failures, which is of great significance to maintaining the stability of the power system. [0003] When partial discharge occurs, it will be accompanied by corresponding sound, light, heat and electricity phenomena. Based on these characteristic quantities, many corresponding ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
CPCG01R31/1227
Inventor 薛峰魏东亮王植李通阙伟平刘珂刘勤锋何俊达林伯琴张雅洁吴秀全胡岳黄洪逸
Owner GUANGDONG POWER GRID CO LTD DONGGUAN POWER SUPPLY BUREAU
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