Method and device for online fault search positioning of multi-branch complex distribution network

Abstract

The invention provides a method and a device for online fault search positioning of a multi-branch complex distribution network. The method comprises collecting topology information and electric capacity information of the distribution network to perform calculation to obtain voltage values of all nodes and current values of circuits of the distribution network; then establishing a distribution network equivalent model; determining fault types and fault phases of the distribution network by means of the fault line selection technique, and performing load compensation on the load fluctuation of the distribution network according to real-time data of initial end voltage and current of a feeder line of the distribution network; and performing sectional flow calculation on the distribution network, performing fault positioning algorithm on the current distribution network load value obtained by load compensation, and performing searching section by section until a fault section and a fault point are found out. The method and the device for the online fault search positioning of the multi-branch complex distribution network can be applied to the multi-branch complex distribution network, are capable of achieving online fault positioning, shorten fault repairing time, improve positioning accuracy and reduce investment cost.

Description

technical field [0001] The present application relates to the field of power grid fault search and location, and in particular to a method for online fault search and location of a multi-branch complex distribution network, and a device for online fault search and location of a multi-branch complex distribution network. Background technique [0002] Today, with the highly developed power technology, the power grid is also becoming more and more developed. In the complex distribution network, there are often power line failures, so it is very valuable for the fault location of the distribution network, and it is also beneficial to improve the speed of maintenance for the regulation of the fault line. [0003] There are mainly four existing fault location methods: traveling wave method, impedance method, S signal injection method and fault indicator. [0004] The traveling wave method can only be used in distribution networks with fewer branches, and it is an offline method, ...

AI Technical Summary

Problems solved by technology

[0005] The impedance method can only be applied to distribution networks with simple lines, and is not suitable for complex distribution networks;

[0006] The energy injected by the S signal injection method is limited. If the fault point is grounded through a large resistance or the fault point is far away from the beginning of the line, the signal will be very weak and cannot be measured accurately;

[0007] The use effect of the fault indicator is not very ideal, the accuracy rate is not high, and there is often no response when a single-phase ground fault occurs in the power grid, and there are many installations in the power grid, which requires a large investment

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