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Route selection method for analyzing first principal component by utilizing principal component of zero-sequence current matrix of faulty feeder line

A technology of principal component analysis and zero-sequence current, applied in the direction of fault location, etc., can solve the problem of low reliability of line selection

Active Publication Date: 2013-12-04
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the problem that the traditional line selection method is affected by the interference signal when the grounding current is weak, and the reliability of the line selection is not high. line selection method

Method used

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  • Route selection method for analyzing first principal component by utilizing principal component of zero-sequence current matrix of faulty feeder line
  • Route selection method for analyzing first principal component by utilizing principal component of zero-sequence current matrix of faulty feeder line
  • Route selection method for analyzing first principal component by utilizing principal component of zero-sequence current matrix of faulty feeder line

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Experimental program
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Effect test

Embodiment 1

[0059] Embodiment 1: as figure 1 Shown is a 35kV distribution network composed of 6 feeder lines whose neutral point is grounded through an arc suppression coil. G in this network is an infinite power supply; T is the main transformer with a transformation ratio of 110 kV / 35kV, and the connection group is YN / d11; the distribution voltage side of the main transformer in my country's distribution network is generally connected in a triangle, and there is no neutral point in the system. When the system adopts the resonance grounding method, it is necessary to obtain a neutral point that can be grounded by the arc suppression coil. Adding a grounding transformer is The best way, here T Z It is a zigzag transformer specially used for grounding of the compensation grid; L is the arc suppression coil, and R is the damping resistance of the arc suppression coil. The line adopts three types of lines: overhead line, overhead line-cable hybrid line and cable line. The numbers of the six ...

Embodiment 2

[0066] Embodiment 2: as figure 1 In the distribution network system shown in which the neutral point is grounded through the arc suppression coil, the system parameters are the same as those in the embodiment. Now assume the feeder L 2 A single-phase ground fault occurs in phase A 5 kilometers away from the beginning, the ground resistance is 20Ω, the fault angle is 90°, and the fault occurrence time is 0.025s. For this system, the line selection process of the first principal component analysis using the fault feeder zero-sequence current matrix principal component is still as follows: figure 2 shown.

[0067] First, intercept the wave recording data of the zero-sequence current of each feeder in the 0.4ms time window after the fault, such as Figure 9-14 As shown, use the formula (1) to calculate the absolute value of the sum of the zero-sequence current of each feeder I ∑ =1.6A, and the threshold of the system is set to I set =100A. because I ∑ =1.6A I set =100...

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Abstract

The invention relates to a route selection method for analyzing a first principal component by utilizing a principal component of a zero-sequence current matrix of a faulty feeder line, belonging to the technical field of relay protection of a power system. The route selection method comprises the steps of: after single-phase earth fault happens to a distribution network with a neutral point grounded through an arc suppression coil, starting up a route selection device to firstly calculate an absolute value of a sum of zero-sequence currents of all the feeder lines in a short time window after the fault, and then realize the judgment of a bus fault and a feeder line fault through the size relationship of the value and a set threshold value; when the feeder line fault is determined, building a zero-sequence current matrix of each feeder line to analyze the principal component so as to obtain each principal component value of each zero-sequence current matrix, and multiplying a sign function of each element of the first principal component by a sign function of the sum of the sign functions of each element of the first principal component, respectively; finally, realizing the fault route selection reliably based on the size relationship of the value and a zero value. The route selection method for analyzing the first principal component by utilizing the principal component of the zero-sequence current matrix of the faulty feeder line improves accuracy and reliability of route selection.

Description

technical field [0001] The invention relates to a line selection method for analyzing the first principal component by using the principal component of the fault feeder zero-sequence current matrix, and belongs to the technical field of electric power system relay protection. Background technique [0002] The distribution network covers a wide area and provides electricity services directly to users. According to statistics, single-phase ground faults account for about 80% of distribution network faults. The resonant grounding system of the distribution network is the neutral point grounding system through the arc suppression coil, which is a small current grounding system. A fault in the small current grounding system will affect the voltage of the non-fault phase ground and cause it to rise, and the voltage rise will damage the insulation of the grid equipment; especially the intermittent arc grounding will cause arc overvoltage, which will destroy the system insulation a...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 束洪春高利段瑞敏朱梦梦
Owner KUNMING UNIV OF SCI & TECH
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