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A Time-Domain Fault Location Method for HVDC Grounding Electrode Lines Based on Bergeron Model

A technology of high-voltage direct current and distance measurement method, which is applied in the direction of the fault location, etc., which can solve the problems of high probability of fault, low voltage of the ground electrode line, and inability to accurately measure the distance of the fault of the ground electrode line, so as to achieve high reliability of distance measurement and measurement High precision, easy to achieve effect

Active Publication Date: 2016-08-24
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 of the ground electrode line is low, and the probability of failure is relatively high. After the failure, it will not only affect the safe operation of the DC system, but also have a great impact on the stable operation of the backbone network frame of the power grid.
At present, although most of the grounding electrode lines are equipped with pulse traveling wave ranging devices, in the actual operation process, there are still many situations where the faults of the grounding electrode line cannot be accurately located

Method used

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  • A Time-Domain Fault Location Method for HVDC Grounding Electrode Lines Based on Bergeron Model
  • A Time-Domain Fault Location Method for HVDC Grounding Electrode Lines Based on Bergeron Model
  • A Time-Domain Fault Location Method for HVDC Grounding Electrode Lines Based on Bergeron Model

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: 800kV DC grounding 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 1MHz. Ground electrode line l 2 A ground fault occurred 10km away from the measuring end, and the transition resistances were 0.2Ω, 2Ω, and 5Ω.

[0031] The steps of the time-domain fault location method for HVDC grounding pole lines based on the Bergeron model are as follows:

[0032] (1) Extract the voltage u at the measuring terminal of the ground electrode lead M (t) and fault line current i dee2 (t), the voltage value on the left side of the fault point is estimated based on the voltage distribution formula along the Bergeron line model :

[0033] (1)

[0034] In the formula, r, , v are resistivity, characteristic impedance, wave velocity respectively, u M (t) is the measured terminal voltage at time t, i dee2 (t) is the faul...

Embodiment 2

[0045] Example 2: 800kV DC grounding 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 1MHz. Ground electrode line l 2 A ground fault occurred 40km away from the measuring end, and the transition resistances were 0.2Ω, 2Ω, and 5Ω.

[0046] The steps of the time-domain fault location method for HVDC grounding pole lines based on the Bergeron model are as follows:

[0047] (1) Extract the voltage u at the measuring terminal of the ground electrode lead M (t) and fault line current i dee2 (t), the voltage value on the left side of the fault point is estimated based on the voltage distribution formula along the Bergeron line model :

[0048] (1)

[0049] In the formula, r, , v are resistivity, characteristic impedance, wave velocity respectively, u M (t) is the measured terminal voltage at time t, i dee2 (t) is the faul...

Embodiment 3

[0060] Example 3: 800kV DC grounding 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 1MHz. Ground electrode line l 2 A ground fault occurred 70km away from the measuring end, and the transition resistances were 0.2Ω, 2Ω, and 5Ω.

[0061] The steps of the time-domain fault location method for HVDC grounding pole lines based on the Bergeron model are as follows:

[0062] (1) Extract the voltage u at the measuring terminal of the ground electrode lead M (t) and fault line current i dee2 (t), the voltage value on the left side of the fault point is estimated based on the voltage distribution formula along the Bergeron line model :

[0063] (1)

[0064] In the formula, r, , v are resistivity, characteristic impedance, wave velocity respectively, u M (t) is the measured terminal voltage at time t, i dee2 (t) is the faul...

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Abstract

The invention relates to a Bergeron model-based high-voltage direct-current earth electrode line time-domain fault range finding method, which belongs to the field of the power system fault range finding technology. When an earth fault occurs at the high-voltage direct-current earth electrode line, the front-end lead voltage and the two-loop outgoing line current of the earth electrode line are measured actually and according to the Bergeron model, a left-side voltage of the fault point of the earth electrode line is calculated by using the front-end voltage and current of the fault line; a pole-site voltage and a pole-site non-fault line current of the earth electrode line are calculated by using the front-end voltage and current of the non-fault line; a pole-site fault line current is calculated based on the pole-site boundary condition and a right-side voltage of the fault point of the earth electrode line is calculated by using the pole-site voltage and the pole-site fault line current; and according to the equal relation of the left-side voltage and the right-side voltage of the fault point, a fault positioning equation is written and a fault distance is obtained by solving the positioning equation. According to the invention, the single-end information content of the line is utilized; the principle is simple and the method can be realized conveniently; and the range finding reliability is high.

Description

technical field [0001] The invention relates to a method for time-domain fault distance measurement of a high-voltage DC grounding pole line based on a Bergeron 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 of the ground electrode line is low, and the probability of failure is high. After the failure, it will not only affect the safe operation of the DC system, but also have a great impact on the stable operation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
Inventor 束洪春王洪林龚石磊田鑫萃董俊
Owner KUNMING UNIV OF SCI & TECH
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