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Grid line relay protection method applicable to double line faults

A line fault and line technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of insufficient sensitivity, long operation time, hidden dangers of large power grids, etc., to achieve fast protection action speed, short calculation time, and improve safety and stability. sexual effect

Active Publication Date: 2014-04-30
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] 1) The coordination relationship of backup protection is complex and the action time is long
In severe cases, it may not meet the limit cut-off time required by the stability of the power system, and then become a hidden danger to the safety of the large power grid
[0004] 2) It is very difficult to configure and set the backup protection, and it cannot track the changes in the operation mode of the power system, and there may even be protection mismatch or insufficient sensitivity
[0005] 3) The backup protection cannot distinguish between the internal fault and the power flow transfer caused by the fault removal, which may lead to chain tripping of the backup protection under heavy load conditions
[0006] In a blackout accident, although the backup protection of the power system operates correctly according to the design principles, it objectively accelerates the system collapse.

Method used

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  • Grid line relay protection method applicable to double line faults
  • Grid line relay protection method applicable to double line faults
  • Grid line relay protection method applicable to double line faults

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Embodiment Construction

[0022] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0023] figure 1 It is a flowchart of a power grid line relay protection method applicable to double line faults of the present invention. In this embodiment, the wide-area backup protection system uses the existing wide-area measurement system of the power grid to simultaneously measure the voltage and current phasors of each substation in the power grid to obtain synchronous data of the power grid.

[0024] If the circuit breakers at both ends of line i and line j are tripped, the wide-area backup protection system calculates the n×n-dimensional correlation matrix ζ=YA between the currents of each line in the power grid T (AYA T ) -1 A; where Y is the grid branch admittance matrix; A is the grid node correlation matrix; i=1,...,n; j=1,...,n; line i and line j are different lines; n is the total number of grid lines .

[0025] The wide-ar...

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Abstract

The invention relates to a grid line relay protection method applicable to double line faults. According to the method, when a grid topology structure changes after double line fault tripping occurs on a grid, a grid branch admittance matrix and a grid node incidence matrix do not need to be amended, and then the variable quantity of current flowing through each line after the grid double line fault tripping occurs can be calculated directly, so that the calculation time is short, the protection action speed is high and is higher than of a line backup protection algorithm based on the local amount decision, the line can be reliably locked before a line overload relay protection faulty operation, other faulty lines can be isolated rapidly in a tripping mode, and the operation safety and stability of the grid are improved.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, and more specifically, relates to a power grid line relay protection method applicable to double line faults. Background technique [0002] The task of relay protection is to reflect the failure and abnormal operation status of the protected components. According to the function, it can be divided into main protection and backup protection. Among them, the main protection is only responsible for the task of quickly removing the faults of the protected components, and is basically not affected by the operation mode of the system. With the application of fiber optic channel, the main protection technology of high-voltage and extra-high-voltage systems based on double-terminal electrical quantities has become more and more mature. The backup protection is also responsible for the remote backup protection of adjacent electrical components. Due to the possibility of fai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26
Inventor 林富洪
Owner STATE GRID CORP OF CHINA
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