Power distribution network fault accurate positioning method based on multi-terminal traveling wave head calibration and wave velocity inversion

By combining optimal phase mode transformation and dual-mode derivative detection with the ESMD-VMD-TEO adaptive method, a multi-terminal traveling wave localization equation set was established and an energy spectrum correlation matrix was constructed. This solved the problems of wave velocity uncertainty, wavehead calibration difficulty, and insufficient multi-terminal data coordination in distribution network fault localization, and achieved high-precision fault localization.

CN122260038APending Publication Date: 2026-06-23HENAN INST OF ENG
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Patent Information

Application Number
CN202610613561.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-05-07
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

Existing fault location methods for power distribution networks suffer from problems such as wave velocity uncertainty, difficulty in wavefront calibration, poor adaptability to phase mode transformation, and insufficient multi-terminal data coordination, resulting in low location accuracy, especially in complex power distribution networks where high-precision location is difficult to achieve.

Method used

The optimal phase mode transformation is used to extract the line mode components. The wavefront is calibrated by combining dual-mode derivative detection and ESMD-VMD-TEO adaptive method. A multi-terminal traveling wave positioning equation set is established and the energy spectrum correlation matrix is ​​constructed through weighted least squares inversion to identify fault branches, thereby achieving high-precision positioning.

Benefits of technology

It achieves precise pole-level location of faults in complex power distribution networks with a positioning error of less than 50 meters. It is applicable to various complex topologies and different environmental conditions, and has good adaptability and robustness.

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Abstract

The invention provides a power distribution network fault accurate positioning method based on multi-terminal traveling wave head calibration and wave velocity inversion, and belongs to the technical field of power distribution network fault positioning. The method comprises the following steps: installing traveling wave acquisition terminals at a plurality of nodes of a power distribution network, and synchronously sampling to obtain fault traveling wave signals; performing optimal phase-mode transformation to extract an optimal line-mode component, and determining an initial traveling wave head coarse positioning moment; performing high-precision calibration on the optimal line mode component by adopting an ESMD-VMD-TEO adaptive method to obtain the wave head position of each measurement point; establishing a multi-end traveling wave positioning equation set based on the relationship between the wave head arrival time of each measurement point and the wave head position; constructing a weighted least square objective function based on a multi-end traveling wave positioning equation set, and performing joint inversion on a fault position, a traveling wave velocity and a fault occurrence moment through a Levenberg-Marquardt algorithm; constructing an energy spectrum correlation matrix to perform fault branch discrimination; and outputting the accurate position of the fault point, the traveling wave velocity and the positioning error confidence interval. According to the method, the tower-level accurate positioning of the complex power distribution network fault is realized.
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