Section fault detection and location method for distribution network with distributed generation

Abstract

A fault detection and location method for a section of a distribution network with distributed power sources, including two parts: fault judgment and location and fault type identification. Its fault judgment and location method detects the fault and identifies the fault phase by comparing the relationship between the absolute value of the phase angle difference of each phase current in each power system section and the threshold value, finds out the section where the fault point is located, and removes it in time fault zone to complete the protection action. Its fault type identification method is based on identifying the fault phase, comparing the zero-sequence current amplitude at the nodes at both ends of the fault section at the time of fault judgment with the set threshold, and judging the fault at the time of fault judgment. Whether the zero-sequence current amplitudes of the zero-sequence currents are all less than or equal to the set threshold, so as to determine whether the fault is a phase-to-phase fault or a ground fault. The invention can be used for section fault detection and location of distribution network with distributed power under high penetration rate.

Description

Section fault detection and location method for distribution network with distributed generation technical field The invention relates to a method for detecting and locating faults in a distribution network containing distributed power sources. Background technique The fault detection and location of the distribution network is an important part of the relay protection of the distribution network power system, which is of great significance to the safe operation of the distribution network and an important guarantee for the self-healing of the distribution network. After the fault, the fault area is removed in time, so that the entire system is affected by the fault to a minimum. With the development of distributed power generation technology, more and more distributed generators (Distributed Generators, DG) are connected to the distribution network, resulting in changes in the network structure of the distribution network and changes in the magnitude and direction of faul...

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Problems solved by technology

The purpose of the present invention is to solve the problem of insufficient self-adaptability in the fault detection and positioning of the existing distribution network containing distributed power, and propose a section fault detection and positioning of the distribution network containing distributed power method

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