Method, system and device for diagnosing and positioning direct-current side fault of alternating-current and direct-current overline fault

By collecting and analyzing the amplitude-frequency characteristics and wavelet coefficients of the DC current signal in the AC-DC transmission system, combining topological information and spatial distribution of current fluctuations, accurately positioning the DC-side fault position of the AC-DC span line fault, solving the problems of long fault response time and inaccurate positioning in the existing technology, and improving the fault positioning efficiency and power system stability.

CN120161279APending Publication Date: 2025-06-17STATE GRID JIANGSU ELECTRIC POWER CO LTD RESEARCH INSTITUTE +2
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Patent Information

Application Number
CN202510250026.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-03-04
Publication Date
2025-06-17

AI Technical Summary

Technical Problem

In AC-DC transmission systems, AC-DC cross-line fault causes the main protection of the DC system to fail to operate, resulting in a long fault response time, causing large power fluctuations in the AC system, and it is difficult for the prior art to accurately locate the fault location.

Method used

By collecting the current signals on the rectifying side and inverting side in the DC bipolar network in real time, extracting the amplitude and frequency characteristics of the current signal, identifying instantaneous changes and abnormal fluctuations, calculating the wavelet coefficients, and performing fault diagnosis based on the set predetermined threshold. Finally, combining topological information and spatial distribution of current fluctuations, the fault occurrence location is positioned.

Benefits of technology

Accurate positioning of DC-side faults is achieved, and the identification ability of complex fault modes, fault positioning efficiency and power system stability are improved.

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Abstract

The invention relates to the technical field of alternating-current and direct-current power transmission, in particular to an alternating-current and direct-current overline fault direct-current side fault diagnosis and positioning method, system and device, and the method comprises the steps: collecting current signals of a rectification side and an inversion side in a direct-current bipolar network in real time, and extracting the amplitude-frequency characteristics of the current signals; identifying instantaneous change and abnormal fluctuation in the current signal according to the amplitude-frequency characteristics, and calculating a wavelet coefficient of the current signal; performing fault diagnosis on the difference value of the wavelet coefficients based on a set preset threshold value; and according to a diagnosis result, combining topological information of the direct-current bipolar network and spatial distribution of current fluctuation to position a fault occurrence position. According to the invention, the direct current side fault diagnosis rapid detection and positioning problem of the alternating current and direct current overline fault is effectively solved.
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