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A Frequency Domain Method for Fault Location of HVDC Grounding Electrode Line Based on Distributed Parameter Model

A distributed parameter model, high-voltage direct current technology, applied in the direction of fault location, information technology support system, etc., can solve the problems of low voltage level of the ground electrode line, affect the DC bipolar system, and cannot measure distance, etc., and achieve easy implementation and high measurement accuracy High, simple algorithm effect

Active Publication Date: 2017-04-12
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The voltage level of the ground electrode line is low, and the probability of line failure is relatively high. After the ground electrode line fails, it will affect the DC bipolar system, which not only has a great impact on the safe operation of the DC system, but also has a great impact on the stable operation of the backbone grid of the large power grid.
At present, most of the grounding electrode lines are equipped with pulse traveling wave ranging devices, but when the grounding electrode lead wire is faulty, the distance cannot be measured many times.

Method used

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  • A Frequency Domain Method for Fault Location of HVDC Grounding Electrode Line Based on Distributed Parameter Model
  • A Frequency Domain Method for Fault Location of HVDC Grounding Electrode Line Based on Distributed Parameter Model
  • A Frequency Domain Method for Fault Location of HVDC Grounding Electrode Line Based on Distributed Parameter Model

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1: ±800kV DC ground electrode line such as figure 1 shown. The line parameters are as follows: the total length of the line is 80km, the DC impedance is 0.023165Ω / km, and the pole resistance is 0.2Ω. The data sampling rate is 6.4kHz. Ground electrode line l 2 A ground fault occurs 20km away from the measuring end, and the transition resistance is 20Ω.

[0041] (1) Using Fast Fourier Transform (FFT), Chebyshev window is selected as the window function, the data window length is N=128, and the dominant frequency component of the electrical quantity at the measurement terminal f=600 Hz is extracted. Calculate the voltage electric current The magnitude and phase of , calculate the voltage and current along the line:

[0042]

[0043]

[0044] (2) Voltage electric current Calculate pole voltage and current

[0045]

[0046]

[0047] (3) Utilize pole address point parameters and line l 1 electric current deduced line l 2 current

[00...

Embodiment 2

[0058] Example 2: ±800kV DC ground electrode line such as figure 1 shown. The line parameters are as follows: the total length of the line is 80km, the DC impedance is 0.023165Ω / km, and the pole resistance is 0.2Ω. The data sampling rate is 6.4kHz. Ground electrode line l 2 A ground fault occurs 40km away from the measuring end, and the transition resistance is 4Ω.

[0059] (1) Using Fast Fourier Transform (FFT), Chebyshev window is selected as the window function, the data window length is N=128, and the dominant frequency component of the electrical quantity at the measurement terminal f=600 Hz is extracted. Calculate the voltage electric current magnitude and phase, calculate the voltage and current along the

[0060]

[0061]

[0062] (2) Voltage electric current Calculate pole voltage and current

[0063]

[0064]

[0065] (3) Utilize pole address point parameters and line l 1 electric current deduced line l 2 current

[0066]

[0067]...

Embodiment 3

[0076] Example 3: ±800kV DC ground electrode line such as figure 1 shown. The line parameters are as follows: the total length of the line is 80km, the DC impedance is 0.023165Ω / km, and the pole resistance is 0.2Ω. The data sampling rate is 6.4kHz. Ground electrode line l 2 A ground fault occurs 70km away from the measuring end, and the transition resistance is 4Ω.

[0077] (1) Using Fast Fourier Transform (FFT), Chebyshev window is selected as the window function, the data window length is N=128, and the dominant frequency component of the electrical quantity at the measurement terminal f=600 Hz is extracted. Calculate the voltage electric current magnitude and phase, calculate the voltage and current along the

[0078]

[0079]

[0080] (2) Voltage electric current Calculate pole voltage and current

[0081]

[0082]

[0083] (3) Utilize pole address point parameters and line l 1 electric current deduced line l 2 current

[0084]

[0085]...

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Abstract

The invention relates to a frequency domain method of fault location of a high-voltage direct current earth electrode line based on a distributed parameter model, and belongs to the field of fault location technologies of power systems. The frequency domain method comprises the following steps of computing voltage distribution along the earth electrode line from a measuring end by utilizing the measured voltage and current of a fault line when the high-voltage direct current earth electrode line has an earth fault; calculating an electrode address point by utilizing the measured voltage and current of a non-fault line, and computing the voltage and the current of the electrode address point; computing the voltage distribution along the earth electrode line from an electrode address end by utilizing the voltage and the current of the electrode address point, writing out a fault location function according to pure resistivity of a transition resistor at the fault point, and computing a fault distance through solving the location function. The frequency domain method is capable of implementing the fault location of a single end of the earth electrode on the basis of the conventional fault measurement data, parameters of an opposite end are not needed, and the frequency domain method has the advantages of simple algorithm and easiness in implementation.

Description

technical field [0001] The invention relates to a frequency domain method for fault distance measurement of a high-voltage direct current grounding electrode line based on a distributed parameter model, and belongs to the technical field of power system fault distance measurement. Background technique [0002] The ground electrode line is an indispensable part of the DC transmission system, and the selection of the ground electrode location is relatively difficult in practice. In order to reduce the influence of the ground electrode current on the equipment of the converter station, the pole site of the ground electrode in the DC system is generally selected to be tens to more than one hundred kilometers away from the converter station. Ground electrode leads connected in parallel. [0003] The voltage level of the ground electrode line is low, and the probability of line failure is relatively high. After the ground electrode line fails, it will affect the DC bipolar system...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCY04S10/52
Inventor 束洪春张怿宁苏玉格田鑫萃董俊
Owner KUNMING UNIV OF SCI & TECH
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