Method for improving fault location accuracy of extra-high-voltage DC transmission line

Abstract

The invention provides a method for improving the fault location accuracy of an extra-high-voltage DC transmission line. According to the method, in case of a line fault, line defect information, a meteorological system and other real-time information are inquired according to position information of the fault to determine the real fault position and actual reasons which cause the line fault, so that solution suggestions can be put forward, the fault handling time is greatly shortened for staff, and economic loss caused by the fault is reduced.

Description

technical field [0001] The invention relates to the field of high-voltage power transmission in electric power systems, in particular to a method for improving the accuracy of fault location of ultra-high voltage direct current transmission lines. Background technique [0002] my country's economy continues to develop, and the requirements for power supply are getting higher and higher, so the power industry is also constantly developing in response to social requirements. In order to ensure sufficient power supply in coastal areas with dense power loads, China Southern Power Grid has formed 15 west-to-east power transmission channels of "seven direct currents and eight alternating currents" of 500 kV and above, all of which are more than 1,000 kilometers long. Longer, so the probability of failure on the line corridor is higher. These long transmission lines shoulder the important task of connecting the resource-rich areas in the west and the power load center in the east....

AI Technical Summary

Problems solved by technology

[0003] The current common fault location identification method relies on traveling wave distance measurement on overhead lines. It becomes relatively complicated, causing the background of the ranging device to calculate multiple possible fault locations, resulting in the failure of ranging; sometimes the same line is installed with fault ranging devices developed by different manufacturers, which will give different fault locations, resulting in failure Determine the real fault location; some line sections do not even install fault distance measuring devices at all; these factors have caused great obstacles to the line operating unit to quickly determine the fault location and organize line maintenance personnel to quickly deal with line faults

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