Power distribution network single-phase high-resistance grounding fault line selection method, system and device

Abstract

The invention discloses a power distribution network single-phase high-resistance grounding fault line selection method, system and device. According to the invention, a plurality of fault characteristic quantities are obtained, a weight is distributed to each fault characteristic quantity, the significance degree of each fault characteristic quantity is quantitatively represented, normalization processing is performed on each fault characteristic quantity after weight distribution, the information of each feeder line when a single-phase high-resistance fault occurs in a system is reflected, and dimensionality reduction processing is performed on each fault characteristic normalization value, so that data redundancy can be reduced, and the calculation speed can be improved; and finally, afinal line selection result is obtained by a fusion line selection model constructed by combining a support vector machine, a Logistic regression classifier and a random forest classifier. The line selection accuracy of the fusion line selection model is improved by acquiring a plurality of fault characteristic quantities and combining a plurality of classifiers, and the technical problem that a line selection result is wrong when the fault characteristic quantity is very weak in a line selection method based on a single fault characteristic quantity in the prior art is solved.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a single-phase high-resistance grounding fault line selection method, system and equipment of a power distribution network. Background technique [0002] The vast majority of distribution networks in my country adopt the operation mode of ungrounded neutral point or grounded through arc suppressing coil, which is called neutral point non-effectively grounded system, also known as small current grounded system. 80% of the faults in the system are single-phase grounding faults. At this time, since the neutral point is not directly grounded, there is no loop on the circuit, and there is almost no short-circuit current flowing in the line, only a small one formed by the line-to-ground capacitance. Therefore, the system is allowed to continue running for 1 to 2 hours under the condition of single-phase grounding, so as to avoid personal safety and property loss caused by sudden power fai...

AI Technical Summary

Problems solved by technology

[0006] The invention provides a single-phase high-resistance grounding fault line selection method, system and equipment in a distribution network, which are used to solve the problem of selecting a line based on a single fault feature when a single-phase high-resistance grounding fault occurs in the distribution network in the prior art. The line method has limitations, and there is a technical problem of wrong line selection results when the fault characteristic quantity is very weak

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