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Extra-high-voltage DC power transmission line area internal and external fault identification method

A UHV DC and fault identification technology, applied to fault locations, emergency protection circuit devices, electrical components, etc., can solve problems such as unreliable criteria and inability to realize full-line protection

Active Publication Date: 2015-10-14
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for identifying faults inside and outside the UHV DC transmission line, which is used to distinguish faults outside the rectifier side, faults inside the fault and faults outside the inverter side, and solve the problem that the current method proposed by electric power scholars cannot realize full-line protection Or the problem that the full-line protection can be realized but the criterion is unreliable

Method used

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  • Extra-high-voltage DC power transmission line area internal and external fault identification method
  • Extra-high-voltage DC power transmission line area internal and external fault identification method
  • Extra-high-voltage DC power transmission line area internal and external fault identification method

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Embodiment 1

[0057] Embodiment 1: as Figure 1-3 As shown, a method for identifying faults inside and outside the UHV DC transmission line area, the specific steps of the method are as follows:

[0058] Step1. After a fault occurs in the UHV DC transmission system, the data acquisition device on the rectification side collects the fault current data within the time window 5ms after the arrival of the first wave of the fault current traveling wave;

[0059] Step2. By comparing the polarity of the fault current detected at the rectification side protection installation at the waveform mutation point, determine the direction of the current traveling wave, and then judge whether the fault signal comes from outside the rectification side area, inside the area or outside the inverter side area;

[0060] First, the detected fault current signal is subjected to morphological MMG transformation, and one layer of MMG transformation coefficients is selected for analysis;

[0061] When the polarity o...

Embodiment 2

[0070] Embodiment 2: as Figure 1-3 As shown, a method for identifying faults inside and outside the UHV DC transmission line area, the specific steps of the method are as follows:

[0071] Step1. After a fault occurs in the UHV DC transmission system, the data acquisition device on the rectification side collects the fault current data within the time window 5ms after the arrival of the first wave of the fault current traveling wave;

[0072]Step2. By comparing the polarity of the fault current detected at the rectification side protection installation at the waveform mutation point, determine the direction of the current traveling wave, and then judge whether the fault signal comes from outside the rectification side area, inside the area or outside the inverter side area;

[0073] First, the detected fault current signal is subjected to morphological MMG transformation, and one layer of MMG transformation coefficients is selected for analysis;

[0074] When the polarity of...

Embodiment 3

[0086] Embodiment 3: as Figure 1-3 As shown, a method for identifying faults inside and outside the UHV DC transmission line area, the specific steps of the method are as follows:

[0087] Step1. After a fault occurs in the UHV DC transmission system, the data acquisition device on the rectification side collects the fault current data within the time window 5ms after the arrival of the first wave of the fault current traveling wave;

[0088] Step2. By comparing the polarity of the fault current detected at the rectification side protection installation at the waveform mutation point, determine the direction of the current traveling wave, and then judge whether the fault signal comes from outside the rectification side area, inside the area or outside the inverter side area;

[0089] First, the detected fault current signal is subjected to morphological MMG transformation, and one layer of MMG transformation coefficients is selected for analysis;

[0090] When the polarity o...

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Abstract

The invention relates to an extra-high-voltage DC power transmission line area internal and external fault identification method, and belongs to the technical field of high-voltage DC power transmission system relay protection. Fault current data are acquired firstly, current traveling wave direction is determined by comparing polarity of fault current at waveform mutation points, and then whether a fault signal comes from the outside of a rectification side area or the inside or the outside of an inversion side area is judged. A problem of double-end information interaction can be solved by adopting a single-end current transient protection method so that whole line protection is realized, and the method is used for distinguishing the fault outside the rectification side area, the fault inside the area and the fault outside the inversion side area.

Description

technical field [0001] The invention relates to a method for identifying faults inside and outside the area of ​​an extra-high voltage direct current transmission line, and belongs to the technical field of relay protection for high voltage direct current transmission systems. Background technique [0002] Currently, traveling wave protection is the main protection in DC line protection, with differential undervoltage protection and differential protection as backup protection. Traveling wave protection and differential undervoltage protection tend to refuse to operate when there is a high-impedance ground fault, and the sensitivity of current differential protection is not high, and the protection action is slow. Transient protection using the attenuation characteristics of boundaries to high-frequency quantities is the development direction of UHV DC transmission line protection. Due to the attenuation characteristics of long transmission lines, full-line protection in th...

Claims

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Application Information

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IPC IPC(8): G01R31/08H02H7/26
Inventor 陈仕龙曹蕊蕊毕贵红杨具瑞李兴旺荣俊香谢佳伟王彦武罗璐李建平黄钰淇
Owner KUNMING UNIV OF SCI & TECH
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