Power distribution network fault section positioning method based on Hausdroff algorithm

Abstract

The invention discloses a power distribution network fault section positioning method based on a Hausdroff algorithm. The method comprises the following steps: when a single-phase earth fault occurs,acquiring transient zero-sequence current data within td time after the moment of the single-phase earth fault by using a zero-sequence current acquisition terminal installed in a power distribution network to form a fault transient zero-sequence current sequence; judging a faulty feeder line according to a zero-sequence current sequence acquired by a zero-sequence current acquisition terminal, closest to the bus, of each feeder line; for a fault feeder line, analyzing the fault transient zero-sequence current similarity of two adjacent sampling points, and according to the characteristics that the zero-sequence waveform similarity of the same side of a fault position is high and the zero-sequence waveform similarity of the different side of the fault position is low, selecting the two adjacent sampling points with the maximum similarity calculation value to determine the fault position. According to the method, accurate fault positioning can be realized, the influence caused by branchlines is avoided, and the method is not influenced by a cable overhead hybrid line.

Description

technical field [0001] The invention relates to smart grid technology, in particular to a method for locating a distribution network fault section based on a Hausdroff algorithm. Background technique [0002] Existing single-phase ground fault section location methods in non-effectively grounded distribution networks can be roughly divided into two categories according to their use of different information: one is the fault section location method based on externally injected signals; the other is the use of single-phase ground fault section location methods. The fault section location method can be divided into the fault section location method based on the fault steady-state component, the fault section location method based on the fault transient component and the comprehensive location method. According to the actual application experience in the field, the segment positioning method based on the similarity comparison of the uploaded transient zero-sequence current chara...

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Problems solved by technology

However, the structure of the on-site medium-voltage power distribution line is complex. For the mixed line of cables and overhead lines, the zero-sequence current will change greatly before and after the junction position; The characteristics of the collected zero-sequence current will also change greatly, which seriously affects the correctness of the traditional section positioning method based on the similarity comparison of the uploaded transient zero-sequence current characteristics

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