Automatic construction method of power grid fault traveling wave fault location equation

A technology of traveling wave distance measurement and power grid fault, applied in the direction of fault location, etc., can solve the problems of poor reproducibility, low efficiency, lack of general machine analysis and construction methods, etc., and achieve the effect of enhancing interpretability

Pending Publication Date: 2022-03-15
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traveling wave ranging algorithm for complex scenes lacks general machine analysis and construction methods, and the ranging algorithm construction for new network topologies and the result verification after obtaining the ranging results have to rely on professional manual analysis, which is inefficient and difficult to adapt flexibly Changes in topology, poor reproducibility

Method used

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  • Automatic construction method of power grid fault traveling wave fault location equation
  • Automatic construction method of power grid fault traveling wave fault location equation
  • Automatic construction method of power grid fault traveling wave fault location equation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: a method for automatically constructing a power grid fault traveling wave ranging equation, the specific steps are:

[0034] Step1: Carry out engineering processing on the grid method of grid line fault wave process analysis.

[0035] Step2: Generate the total extended branch time record table and the extended branch record table based on the measuring points from the recursive data of the wave process grid method, and write the traveling wave propagation path equation in parallel.

[0036] Step3: On the basis of obtaining the expression of the traveling wave path equation, take the fault distance and fault time as unknown parallel equations, and judge the linear equations according to the relationship between the rank of the coefficient matrix, the number of equations and the number of unknowns Whether it can be solved, if yes, the corresponding ranging formula can be obtained through symbolic operation, if not, the ranging formula cannot be formed.

[0...

Embodiment 2

[0058] Embodiment 2: with figure 1 The 220kV transmission network shown is taken as an example, and the realization process of the proposed scheme is given. Line, zero-mode wave impedance Z c1 =243Ω, Z c0 =598Ω, line zero-mode wave velocity v 1 =2.92×10 5 km / s, v 0 =1.93×10 5 km / s, current traveling wave measuring points are measured in O 1 , O 2 , O 3 , O 4 Marked in the figure, the line lengths are FC=80km, AF=30km, FH=20km, HD=90km, DG=40km, GB=25km, GC=50km.

[0059] Such as Figure 5 As shown, an automatic construction method of grid fault traveling wave ranging equation, the specific implementation steps are:

[0060] Step1: Carry out engineering processing on the grid method of grid line fault wave process analysis, the specific steps are as follows figure 2 shown.

[0061] Step1.1: Use vertices and edges to abstract transmission lines, number the lines, specify fault lines, and generate line-length adjacency matrix. Let line 1 be the fault line, and the ...

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Abstract

The invention relates to a power grid fault traveling wave fault location equation automatic construction method, and belongs to the technical field of power system protection. According to the invention, engineering processing is carried out on a grid method for power grid line fault wave process analysis; generating a total extension branch time record table and an extension branch record table based on a measuring point according to recursive data of a wave process grid method, and writing a wave propagation path equation in parallel; and on the basis of obtaining the traveling wave path equation expression, assigning unknown numbers and establishing an equation set in parallel, judging whether the linear equation set can be solved or not according to the relationship among the rank of the coefficient matrix, the number of equations and the number of the unknown numbers, if so, obtaining a corresponding distance measurement formula through symbolic operation, and if not, not forming the distance measurement formula.

Description

technical field [0001] The invention relates to an automatic construction method of a power grid fault traveling wave ranging equation, belonging to the technical field of electric power system protection. Background technique [0002] Quickly and accurately determining the location of transmission line faults plays an important role in reducing blindness in line inspections, speeding up fault repairs, reducing power outage losses, and enhancing the pertinence of hidden trouble detection. Traveling wave ranging is an important technology for transmission line fault location, which has extremely high theoretical positioning accuracy and time-domain waveform resolution. With the continuous deepening of power electronics in power systems, traveling wave ranging has been widely used in scenarios such as DC lines where traditional impedance method ranging is not applicable, and has expanded from AC transmission networks to low-voltage secondary transmission networks and even dist...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08
CPCG01R31/08
Inventor 张广斌杨春黄杨孙勇束洪春
Owner KUNMING UNIV OF SCI & TECH
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