Distribution network fault location method and system with high permeability distributed power source

Abstract

The invention discloses a distribution network fault location method and system with a high permeability distributed power source. The method comprises the following steps that: S1: when a distribution network with a high permeability distributed power grid fails to work, a power grid power detection point and a distributed power supply grid-connected point detect sudden changes and collect A-phase, B-phase and C-phase currents and voltages of a current transformer and a voltage transformer at the power grid power detection point and the distributed power supply grid-connected point; S2, Thevenin equivalent processing is performed on a distributed power supply, positive-sequence, negative-sequence, zero-sequence Thevenin equivalent impedances of the distributed power supply are calculated,and thus a bus impedance matrix is established; S3, a fault indicator is constructed to identify a fault interval; and S4, a virtual bus positioning fault point is constructed. According to the invention, the distributed power supply is normalized and a model adapting to various power supplies is established; and the established bus impedance matrix is independent of the distributed power supplytype.

Description

technical field

[0001] The invention relates to the technical field of distribution network fault location, in particular to a method and system for fault location of a distribution network containing distributed power sources with high penetration rate. Background technique

[0002] As fossil fuel reserves are depleted and global energy demand continues to grow, the prominence of renewable energy continues to rise. Distributed power generation improves the efficiency of clean energy utilization and solves the problem of power supply in remote rural areas through renewable energy such as wind power and solar energy. It has become one of the important measures for countries around the world to promote energy conservation and emission reduction and address climate change. However, the access of distributed power to the distribution network will change the original single power supply and radial structure characteristics of the power grid, making the distribution network a netw...

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