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A hybrid line-based DC transmission fault restart method and device

A hybrid line and direct current transmission technology, which is applied to the fault location, circuit device, emergency protection circuit device, etc., can solve the problems of automatic restart of the line and the inability to accurately distinguish the fault area, so as to prolong the service life, improve the availability rate and Economical effect

Active Publication Date: 2021-07-30
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, for DC transmission lines based on cables and overhead lines, because the current measuring point and protection system configuration cannot accurately distinguish the fault area, it is impossible to perform targeted automatic restart operations after a line fault occurs

Method used

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  • A hybrid line-based DC transmission fault restart method and device
  • A hybrid line-based DC transmission fault restart method and device
  • A hybrid line-based DC transmission fault restart method and device

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Embodiment Construction

[0043] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0044] see figure 1 , is a schematic flowchart of a hybrid line-based DC transmission fault restart method provided by an embodiment of the present invention, and the method includes steps S1 to S4:

[0045] S1. Obtain the current calculation results of the protection devices in the converter stations at both ends of the hybrid line after the DC transmission system fails, and determine the positions of the measurement points corresponding to the two current values ...

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Abstract

The invention discloses a method and a device for restarting a direct current transmission fault based on a hybrid line. The method comprises the steps of: acquiring the current calculation results of the protection devices in the converter stations at both ends of the hybrid line, and determining two currents whose current calculation results are greater than a threshold value. The position of the measurement point corresponding to the value; determine the type of the corresponding line between the two measurement points; when the corresponding line is a cable line, send the first control command to the converter valve of the converter station to make the converter valve perform Phase-shifting and blocking actions; when the corresponding line is an overhead line, send a second control command to the converter valve to make the converter valve perform phase-shifting and restarting actions, and then judge whether the fault disappears; if so, the restart is successful; If not, continue to send the second control command to the converter valve, when the total number of sending times reaches three times and the fault has not disappeared, send the third control command to the converter valve to lock the converter valve. The present invention can carry out the restarting action in a targeted manner according to the line type.

Description

technical field [0001] The invention relates to the technical field of electric power market, in particular to a hybrid line-based DC transmission fault restart method and device. Background technique [0002] In recent years, high-voltage power transmission technology has developed rapidly, and high-voltage power transmission has played an increasingly important role in the field of long-distance, large-capacity power transmission and power transmission in urban centers. High-voltage transmission lines mainly use overhead lines, and cables are used in some areas. With the expansion of the application range of high-voltage power transmission technology, the application scenarios are becoming more and more complex. There are situations that require the use of hybrid lines connected by overhead lines and cables, such as island networking, power supply in urban centers, etc. In the seabed and urban center areas, cables are required, while in island land and urban suburbs, it i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H3/06H02H3/28H02H1/00G01R31/08
CPCG01R31/083G01R31/085H02H1/0007H02H1/0061H02H3/06H02H3/28H02H7/268
Inventor 彭发喜黄伟煌李岩许树楷刘涛辛清明雷博
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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