A power distribution network fault identification and positioning method, system, device and medium

By collecting and analyzing the background noise and active input impedance spectrum of the distribution network, the fault-sensitive frequency band is locked, and a frequency sweep excitation signal is adaptively generated. Combined with the virtual characteristic impedance cancellation principle, the problem of low efficiency and insufficient accuracy in complex fault location in the existing technology is solved, and efficient and accurate fault identification and location are achieved.

CN122043146BActive Publication Date: 2026-07-03STATE GRID ZHEJIANG ELECTRIC POWER CO LTD HANGZHOU POWER SUPPLY CO +1
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
STATE GRID ZHEJIANG ELECTRIC POWER CO LTD HANGZHOU POWER SUPPLY CO
Filing Date
2026-04-17
Publication Date
2026-07-03

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Abstract

The present application relates to the field of power system relay protection and automation, and discloses a power distribution network fault identification and positioning method, system, device and medium, after the triggering of the fault of the power distribution network, the background noise voltage spectrum and the active input impedance spectrum of the power distribution network are collected and mutual information analysis is performed thereon to obtain a local mutual information frequency domain spectrum; the fault sensitive frequency band in the local mutual information frequency domain spectrum is searched, and a sweep excitation signal is adaptively generated in combination with the active input impedance spectrum to be injected into the power distribution network to obtain impedance response data; the spectral entropy time-varying variance of the sweep excitation signal is calculated to identify the fault type of the power distribution network; the distributed parameter transmission line model of the fault line is constructed based on the impedance response data and solved by using the virtual characteristic impedance cancellation principle to obtain the fault positioning result of the power distribution network; the problem that the existing active positioning technology ignores the value of the background noise, sweeps blindly and has low efficiency is solved.
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