Fault location method and system for double-ended dc transmission, storage medium and computer

By employing a dual-end DC transmission fault location method, utilizing precise signal processing and high-precision line modeling, combined with an intelligent search strategy, the problem of insufficient accuracy and reliability in ultra-high voltage DC transmission line location was solved, achieving high-precision fault location.

CN122109720APending Publication Date: 2026-05-29GUANGDONG UNIV OF TECH
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
GUANGDONG UNIV OF TECH
Filing Date
2026-03-23
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

Existing fault location methods for DC transmission lines suffer from insufficient accuracy and reliability in ultra-high voltage systems, especially in complex electromagnetic environments where they fail to meet engineering requirements.

Method used

A dual-end DC transmission fault location method is adopted. Through precise signal processing, high-precision line modeling and intelligent search strategy, the modal current signal is extracted by matrix transformation. Combined with Laguerre orthogonal basis matrix denoising and Bergeron time-domain equivalent model, a weighted energy density spatial distribution function is constructed, and a two-level iterative search strategy is used for fault location.

Benefits of technology

It achieves high sensitivity and strong noise resistance, enabling high-precision fault location at the sub-kilometer level in complex electromagnetic environments, and is unaffected by transition resistance.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122109720A_ABST
    Figure CN122109720A_ABST
Patent Text Reader

Abstract

The present application relates to a double-ended DC power transmission fault location method, system, storage medium and computer, the method first uses the energy structure characteristics of current signal to construct high sensitivity starting criterion, accurately records the fault time. Secondly, based on the voltage and current data before and after the fault time, the first modal counter-traveling voltage wave is extracted, and the method of Laguerre orthogonal matrix fitting combined with Hilbert transform is used for accurate denoising, and the noise interference is effectively filtered out. Then, the Bergeron time domain equivalent model of the double-ended DC power transmission system containing frequency variable loss is constructed, the denoised counter-traveling voltage wave is taken as the excitation, and the time domain fault voltage signal is solved. Finally, based on the fault voltage signal, the weighted energy density spatial distribution function is constructed, and the two-stage iterative search strategy is adopted to accurately locate the fault point. The present application has strong anti-interference ability, high location accuracy, and is not affected by the transition resistance.
Need to check novelty before this filing date? Find Prior Art