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Regional power grid fault isolation method based on Floyd-Warshall algorithm

A regional power grid, fault isolation technology, applied in the direction of electrical components, circuit devices, emergency protection circuit devices, etc.

Active Publication Date: 2019-07-23
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to aim at the above-mentioned deficiencies in the prior art, to provide a kind o

Method used

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  • Regional power grid fault isolation method based on Floyd-Warshall algorithm
  • Regional power grid fault isolation method based on Floyd-Warshall algorithm
  • Regional power grid fault isolation method based on Floyd-Warshall algorithm

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Embodiment

[0138] refer to figure 2 , the main wiring of a typical 220kV substation. In this figure, CB1, CB2, ..., CB19 are circuit breakers; L1, L2, ..., L7 are lines; B1, B2, ..., B8 are bus bars; T1, T2 are transformers, and the above components Corresponding to numbers 1 to 36 respectively.

[0139] when figure 2 When all the circuit breakers and isolating switches are closed, the protected element-circuit breaker adjacency matrix W can be obtained 1 and the circuit breaker adjacency matrix W 2 . Then the corresponding adjacency matrix is ​​corrected according to the real-time status of circuit breakers and disconnectors in the power grid.

[0140] Such as figure 2 The isolating switch between CB2 and B1 and CB5 are both off, then according to formula (11), the protected element-circuit breaker adjacency matrix W 1 middle element r 2,27 ,r 27,2 , r 5,29 , r 29,5 , r 5,30 , r 30,5 The value of is modified from 1 to ∞; according to formula (12), the circuit breaker adja...

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Abstract

The invention discloses a regional power grid fault isolation method based on a Floyd-Warshall algorithm. The method comprises the following steps: an adjacent matrix reflecting a power grid topological structure is constructed according to real-time switch state information in a power grid, a real-time adjacent matrix is searched by using the Floyd-Warshall algorithm, to obtain the distances forconnecting protected elements and circuit breakers and a plurality of shortest paths corresponding to the distances, the shorter the distance is, the closer the end point circuit breaker of the shortest path is to be protected, and for a single fault or multiple faults, circuit breaker failure and transformer substation direct-current power supply disappearance, the nearest isolation circuit breaker can be correctly found, and corresponding trip-out decisions can be executed. According to the invention, a flexible trip-out strategy is formulated from a global perspective, the method can effectively adapt to the change of the main wiring mode and the system operation mode of a power station, enables the fault isolation area to be kept minimum, constructs a trip-out circuit breaker set according to the real-time power grid topological structure before a fault occurs, and effectively prevents a fault trigger type trip-out circuit breaker searching mode from occupying unnecessary fault processing time.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and in particular relates to a fault isolation method of a regional power grid based on a Floyd-Warshall algorithm. Background technique [0002] The power system is a tightly coupled system, and the dependencies between various system components are strong. When the system fails, in addition to reliably and effectively identifying the fault components, the relay protection system also needs to disconnect the fault part in the system to prevent or limit the destructive effect of the fault. Therefore, the fault isolation system must have the characteristics of fast, safe, sensitive, and strong adaptability, so as to ensure the rapid and effective isolation of system faults. [0003] The existing protection tripping configuration method is a point-to-point direct tripping method, in which a tripping command is sent by a protection system based on local measurement in...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H7/28H02H1/00
CPCH02H1/0092H02H7/26H02H7/28
Inventor 童晓阳张广骁
Owner SOUTHWEST JIAOTONG UNIV