Method for judging tail end of faults when multiple faults occur in open-loop peer-to-peer network

Abstract

The invention provides a method for judging the tail end of faults when multiple faults occur in an open-loop peer-to-peer network. Electric switches meeting the following conditions are judged to be at the tail end of the faults: in terms of a common switch, fault currents flow through the common switch, and at least one electric switch adjacent to the common switch and with the fault currents flowing through exists on one and only one side of two sides of the common switch; in terms of a boundary switch, the fault currents flow through the boundary switch, and electric switches adjacent to the boundary switch have no fault current flowing through; in terms of an end switch, the fault currents flow through the end switch. The method can solve the problem of how to judge multiple faults. When multiple faults occur simultaneously, multiple fault sections can be accurately judged simultaneously, impact frequency of the fault currents on a power grid is reduced, time of power failure caused by the faults is shortened, the influence range of the faults is reduced, and reliability and security of the power grid are improved in the operation process.

Description

technical field [0001] The invention relates to a distribution automation fault processing technology, in particular to a fault judgment method in a power grid using an open-loop peer-to-peer network. Background technique [0002] The peer-to-peer network protection algorithm can have two modes. The first mode is the algorithm of the peer-to-peer network protection in the radial operation mode, also known as the open-loop mode of the peer-to-peer network protection. The second mode is the algorithm of the peer-to-peer network protection in the parallel power supply mode of multiple power sources, which is also called the closed-loop mode of the peer-to-peer network protection. In the prior art, there is a fault judgment method designed for a power grid based on an open-loop peer-to-peer network, which is used to locate the end of the fault. However, there are limitations in the prior art for the fault judgment method of the switch-to-peer network. If only one fault occurs ...

AI Technical Summary

Problems solved by technology

However, there are limitations in the prior art for the fault judgment method of the switch-to-peer network. If only one fault occurs on the line, the prior art judgment method can accurately determine the fault end and the fault section; if multiple faults occur simultaneously on the line , the prior art judgment method has missed judgments, resulting in failure to contain the impact of fault current on the power grid in time, affecting the reliability and safety of power grid operation

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