Active power distribution network fault positioning method and system based on current polarity comparison

Abstract

The invention relates to an active power distribution network fault positioning method based on current polarity comparison. Each detection point of an active power distribution network feed line is provided with a switch and an FTU, the FTUs are in information interaction via communication network. The FTUs detect the fault current in real time, the current abrupt change time is taken as the fault starting point, the fault current signal of half cycle after the fault is recorded, the polarity is calculated according to the data of the half cycle, and the fault positioning is realized by comparing the polarity of the fault current of the adjacent detection points. In addition, when the fault positioning credibility is low and missed reporting occurs, the data detected at the downstream replaces the detection point data to realize the fault positioning, so that the method has a certain fault tolerance capability. The high-precision fault positioning of the active power distribution network including a distributed power supply can be realized, and the rapid fault positioning can be realized as well, so that the requirement of the active power distribution network can be met. The method further supports the power distribution network of the high-permeability distributed power supply, and facilitates the promotion of energy saving and emission reduction and smart grid construction.

Description

technical field [0001] The invention belongs to the technical field of power line fault location in electric power systems, and in particular relates to an active distribution network fault location method and system based on current polarity comparison. Background technique [0002] In the power system, fast and accurate fault location is a very important link to ensure the normal operation of the power system and reduce the average power outage duration index of the system. [0003] With a large number of distributed generation (Distributed Generation, DG) connected to the distribution network, the planning, operation and control of the distribution network have become hot issues in the smart distribution network. The active distribution network technology that can realize the functions of active planning, active management and active control is undoubtedly a new idea to solve these problems. The active distribution network has changed from the original radial network wit...

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Problems solved by technology

[0006] In order to solve the above problems, the present invention overcomes that the traditional fault location method cannot be applied to the active distribution network containing distributed power sources, or the traditional fault location method has low fault location accuracy and difficulty in identification when it is applied to the active distribution network. For the problem of requiring additional installation of equipment, a method and system for active distribution network fault location based on current polarity comparison are provided

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