Power distribution network fault hierarchical positioning method considering FTU missing report and false report

Abstract

The invention discloses a power distribution network fault hierarchical positioning method considering FTU missing report and false report. The method comprises the following steps: 1, carrying out fault positioning: carrying out two-port equivalence on each branch of a power distribution network; 2, constructing a power distribution network fault hierarchical model considering missing report andfalse report; 3, collecting fault information; 4, positioning a first layer of fault port. The method has advantages that the missing report and the false report of the FTU node and the feeder line section are directly used as fault hypothesis variables, and the dimensionality of the fault positioning analysis model variable can be increased by several times. In order to reduce the dimension of the variable, the dimension of the variable to three times of the number of nodes is reduced by using a fault contradiction hypothesis on the algorithm. Then, by constructing a layered positioning model, the whole fault positioning is divided into two times, namely a primary fault port positioning and a secondary fault section positioning, so that the accuracy and the fault-tolerant capability of the fault positioning after the missing report and the false report are considered to be greatly improved.

Description

Technical field [0001] The present invention relates to the technical field of a method for locating faults in a distribution network, and more specifically to the technical field of a hierarchical analysis model for fault locating of a distribution network that takes into account FTU false alarms and false alarms. Background technique [0002] With the increasing power load and the large number of distributed power sources (DG) connected to the grid, the structure and trend of the power distribution system are becoming larger and more complicated, and the traditional single-source radial network fault location method is no longer applicable. . Due to its high fault-tolerant performance and simple principle, the artificial intelligence algorithm-based fault location method of distribution network has been studied a lot in recent years and has achieved fruitful results. [0003] Genetic algorithm was the first to be used in the location of distribution network sections, and then an...

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Problems solved by technology

The common point of the above distribution network section positioning methods is that they only use the section state hypothesis as a variable, and do not take into account the node's missed and false positives, resulting in multi-point distortion of the node state variable during the communication process. Will not be able to accurately locate the faulty segment

Some methods include false alarms and false alarms in the section location model (Zhang Yong, Dong Ming, Zhang Yan, Wen Fushuan, Dai Yan, Sun Weizhen. Fault location including alarm errors in distributed power distribution systems [J]. Electric Power System Automation, 2012,36(15):57-62+82.), but did not propose a method to reduce the particle dimension. When the number of nodes in the distribution network is large, the fault hypothesis variable increases exponentially. The accuracy of fault location will decrease instead

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