A single-phase high-resistance grounding fault line selection method, system and equipment in a distribution network

Abstract

The invention discloses a single-phase high-resistance grounding fault line selection method, system and equipment of a distribution network. The invention assigns weights to each fault feature by acquiring multiple fault feature quantities, and quantitatively expresses each fault feature quantity The significant degree of each fault feature after the weight distribution is normalized to reflect the information of each feeder when a single-phase high-resistance fault occurs in the system, and the dimensionality reduction process is performed on each fault feature normalized value to Reduce data redundancy and improve calculation speed; finally, use the fusion line selection model constructed by the combination of support vector machine, Logistic regression classifier and random forest classifier to get the final line selection result, by obtaining multiple fault features Quantities and multiple classifiers are combined to improve the line selection accuracy of the fusion line selection model, which solves the problem that the line selection method based on a single fault feature quantity in the prior art will cause a line selection result error when the fault feature quantity is very weak technical problems.

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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