Automatic Fault Location Method for Distributed Feeder in Active Distribution Network

Abstract

The invention provides an active power distribution network distributed feeder automation fault locating method which is a novel active power distribution network distributed feeder automation (FA) fault locating method implemented by using an intelligent distributed FA terminal arranged for a switch on a distributing line based on fault current overcurrent status information and fault current phase difference information; during site implementation, a distributed power is connected to a power distribution network through a breaker, and intelligent distributed FA terminals are arranged on distributed power side breakers, a transformer substation outlet breaker and load switches of a circuit; the intelligent distributed FA terminals are used for determining fault sections respectively through statistics and analyzing of the failure current overcurrent state and failure current phase; failure determination is accurate, the problems of high permeability access of a distributed power source and fault location of multi-branch line distribution network are effectively solved, the reliability is high, the project implementation is strong, and the dependency on communication network is effectively reduced.

Description

technical field [0001] The invention relates to the technical field of feeder automation in active distribution networks, in particular to a fault location method for distributed feeder automation in active distribution networks. Background technique [0002] Distributed Generator (DG), as a new form of energy, has been widely used all over the world. However, with the high penetration rate of distributed power, the distribution network has become a multi-terminal power structure, and its power flow and short-circuit current may flow in both directions, thus bringing new challenges to the relay protection and feeder automation of the distribution network. question. Affected by the short-circuit current injected by distributed power sources, traditional fault location methods based on overcurrent protection may fail. [0003] At present, for the fault location of the active distribution network, some papers refer to solutions such as the matrix method, the coordination meth...

AI Technical Summary

Problems solved by technology

Affected by the short-circuit current injected by the distributed power supply, the traditional fault location method based on overcurrent protection may fail

[0003] At present, for the fault location of the active distribution network, some papers refer to solutions such as the matrix method, the coordination method of distributed power generation off-grid and reclosing, and the method of current mutation direction. There are some drawbacks in the secondary reclosing and reliability, etc., or it can only be applied to lines with relatively simple topology

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