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Two-cable-section mixing direct current power transmission line fault section identification method based on mode identification

A hybrid DC and transmission line technology, applied in the direction of fault location, information technology support system, etc., can solve the problems of discontinuous wave impedance, increase the difficulty of fault identification of traveling wave head, and different propagation rules of traveling waves, and achieve amplitude and The effect of reduced steepness, high accuracy, and simple principle

Inactive Publication Date: 2015-12-02
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For cable hybrid DC transmission lines, due to the different characteristic impedance and propagation constants of the cable section and the overhead line section, the propagation rules of traveling waves in different sections are different; especially for the connection between the cable section and the overhead line section, due to the wave Impedance discontinuity makes the traveling wave refract and reflect at the connection, and the mutual superposition of waveforms further increases the difficulty of identifying the faulty traveling wave head

Method used

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  • Two-cable-section mixing direct current power transmission line fault section identification method based on mode identification
  • Two-cable-section mixing direct current power transmission line fault section identification method based on mode identification
  • Two-cable-section mixing direct current power transmission line fault section identification method based on mode identification

Examples

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Effect test

Embodiment 1

[0027] Example 1: 450kV two-section cable hybrid DC transmission line such as figure 1 shown. Its line parameters are as follows: the total length of the line is 50km in the MJ section, 100km in the JN section, smoothing reactor L M =L N =0.4H, relay R 1 Installed on the busbar side of the cable section. Fault location: A ground fault occurs at a distance of 5.6km from the M terminal to the positive pole of the MJ section (cable section). The transition resistance is 50Ω, and the sampling rate is 1MHz.

[0028] The first step is to set the fault point: set the fault point at equal intervals of 5km along the positive and negative poles of the cable hybrid DC transmission line. In order to better reflect the fault at the special location, set the fault point at 1km, 49km, 51km, and 149km , the fault type is ground fault, the fault traversal is carried out through the electromagnetic transient simulation software PSCAD, the relay R 1 Obtain positive and negative voltage tra...

Embodiment 2

[0032] Example 2: 450kV two-section cable hybrid DC transmission line such as figure 1 shown. The line parameters are as follows: the total length of the line is 50km for the MJ section, 100km for the JN section, smoothing reactor L M =L N =0.4H, relay R 1 Installed on the busbar side of the cable section. Fault location: A ground fault occurs at the positive pole of the JN section (overhead line section) 61.5km away from the M terminal. The transition resistance is 10Ω, and the sampling rate is 1MHz.

[0033]The first step is to set the fault point: set the fault point at equal intervals of 5km along the positive and negative poles of the cable hybrid DC transmission line. In order to better reflect the fault at the special location, set the fault point at 1km, 49km, 51km, and 149km , the fault type is ground fault, the fault traversal is carried out through the electromagnetic transient simulation software PSCAD, the relay R 1 Obtain positive and negative voltage trave...

Embodiment 3

[0037] Example 3: 450kV two-section cable hybrid DC transmission line such as figure 1 shown. Its line parameters are as follows: the total length of the line is 50km in the MJ section, 100km in the JN section, smoothing reactor L M =L N =0.4H, relay R 1 Installed on the busbar side of the cable section. Fault location: a ground fault occurred at the negative line of JN section (overhead line section) 148.6km away from M terminal. The transition resistance is 10Ω, and the sampling rate is 1MHz.

[0038] The first step is to set the fault point: set the fault point at equal intervals of 5km along the positive and negative poles of the cable hybrid DC transmission line. In order to better reflect the fault at the special location, set the fault point at 1km, 49km, 51km, and 149km , the fault type is a single-phase ground fault, and the fault traversal is carried out through the electromagnetic transient simulation software PSCAD, and the relay R 1 Obtain positive and negat...

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Abstract

The invention relates to a two-cable-section mixing direct current power transmission line fault section identification method based on mode identification, and belongs to the electric power system fault range finding technology field. When two sections of cables are mixed and a direct current power transmission line is out of order, an absolute value of fault pole voltage travelling wave data obtained at a cable measuring end is calculated, normalization processing is carried out, and discrimination of a cable mixing direct current power transmission line fault section is determined by utilization of a principal component clustering analysis method. The fault section is discriminated according to plus or minus of a projection q1 value of the voltage initial fault traveling wave on the first principal component (PC1) shaft, if the sign of the projection value q1 is positive, the overhead line fault is determined; otherwise, the cable line fault is determined. Principal component clustering analysis is carried out by utilization of the absolute value of the fault pole voltage, influences of fault line polarity to fault section discrimination are avoided effectively, the principle is simple, and the method is reliable and effective.

Description

technical field [0001] The invention relates to a method for identifying a fault section of a two-section cable hybrid DC transmission line based on pattern recognition, and belongs to the technical field of power system fault distance measurement. Background technique [0002] In recent years, with the development of the power industry, the voltage level and transmission capacity of transmission lines have gradually increased, and cable hybrid transmission lines have become more and more widely used in high-voltage transmission and distribution projects. When a cable hybrid transmission line fails, it is of great significance to quickly and accurately determine the fault point and eliminate the fault point to improve the reliability of power supply and reduce the power outage time. [0003] For cable hybrid DC transmission lines, due to the different characteristic impedance and propagation constants of the cable section and the overhead line section, the propagation rules ...

Claims

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Application Information

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IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 束洪春白冰田鑫萃
Owner KUNMING UNIV OF SCI & TECH
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