A distribution network fault line selection method based on Min's distance of characteristic frequency band convergence

A technology of distribution network faults and characteristic frequency bands, which is applied in the direction of fault location and fault detection according to conductor type, can solve the problems of extended power outage time, operation overvoltage and resonance overvoltage distribution network impact, etc., and achieve the goal of improving accuracy Effect
CN109188193BActive Publication Date: 2020-09-25KUNMING UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
KUNMING UNIV OF SCI & TECH
Publication Date
2020-09-25

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Abstract

The invention relates to a fault line selection method for a distribution network based on a convergence Minkowski distance of a feature band, and belongs to the technical field of power system relayprotection. The method comprises the steps of: collecting the zero-sequence current data of each feeder when a single-phase ground fault occurs in the distribution network; calculating the total energy of each feeder at each scale by using the wavelet transform on the zero-sequence current in a short-time window; determining the feature bands according to the energy and the maximum principle; calculating convergence Minkowski distances of the feature bands between each feeder to form a fault distance matrix of the feature bands; calculating comprehensive fault distances between each feeder line by using the fault distance matrix of the feature bands; obtaining relative probabilities of occurrence of the single-phase ground fault of each feeder according to the comprehensive fault distancesbetween the feeders; and performing fault line selections according to the relative probabilities of the fault occurrence. Theoretical analysis and extensive simulations show that the effect of the fault line selection method is good.
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Description

technical field

[0001] The invention relates to a distribution network fault line selection method based on characteristic frequency band convergence Min's distance, and belongs to the technical field of power system relay protection. Background technique

[0002] When a single-phase grounding fault occurs in the small-current grounding system of the distribution network, the non-faulty phase-to-ground voltage will rise, and the voltage rise will damage the insulation of the distribution network, and then develop into phase-to-phase or multi-point grounding faults, causing system overvoltage. Therefore, it is necessary to accurately and quickly find the faulty line and isolate the faulty line from the system in time. In order to find the faulty line, the traditional methods are as follows: (1) Manually pull the circuit, manually pull the brakes one by one to determine the faulty line, this method will cause an instantaneous power failure of the normal power supply line and r...

Claims

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