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A method for identifying the last circuit breaker of valve group based on Dijkstra algorithm

A final circuit breaker and identification method technology, applied in the direction of circuit devices, complex mathematical operations, emergency protection circuit devices, etc., can solve problems such as large amount of calculation, and achieve the effect of simple identification method, simple method, and strong practicability

Active Publication Date: 2021-01-29
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, when there are many paths between the valve group and the AC line, the final circuit breaker judgment method based on path coincidence requires a large amount of calculation

Method used

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  • A method for identifying the last circuit breaker of valve group based on Dijkstra algorithm
  • A method for identifying the last circuit breaker of valve group based on Dijkstra algorithm
  • A method for identifying the last circuit breaker of valve group based on Dijkstra algorithm

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example

[0052] Example: figure 2 The electrical main wiring diagram of the AC field is given. The AC field includes 2 valve groups P1 and P2, 2 bus tie circuit breakers 5101 and 5102, 5011~5073 are interval series circuit breakers, and the lines are represented by L1~L7. T1-T9 represent the intersection of the AC line or the valve group and the AC string.

[0053] In the initial stage of DC project construction, figure 2 Only the first 6 interval strings are put into operation in the AC field, so the adjacency matrix C of the AC field is established as follows:

[0054]

[0055] The vertex set of the shortest path from valve group P1 to line convergence point L obtained by Dijkstra algorithm is P={P1, T4, 5033, B2, 5013, T2, L}.

[0056] Thus, the shortest path circuit breaker vertex set U={5013, 5033} corresponding to this set is obtained. Set the circuit breakers in the set to open in turn, and set the row and column elements of the circuit breaker in the adjacency matrix to...

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Abstract

The invention discloses a method for identifying the final circuit breaker of a valve group based on the Dijkstra algorithm. According to the topological structure of the AC field, it is abstracted into an undirected connected graph, and an adjacency matrix is ​​constructed; the switching state of the circuit breaker in the AC field collected in real time is updated. Adjacency matrix, transforming the final circuit breaker judgment problem into Dijkstra algorithm to solve the problem of the shortest path from the valve group vertex to the AC line collection vertex; when a certain circuit breaker vertex on the path is set to open state, continue to search the valve group vertex to the AC line Convergence vertex, if there is a path between the valve group vertex and the AC line convergence vertex, then this vertex is the last circuit breaker; otherwise, this vertex is not the last circuit breaker. The invention is simple and effective, and can judge the last circuit breaker of the valve group in real time when the operation mode of the AC field changes, without preparing the last circuit breaker retrieval table in all operating states of the AC field in advance, and has good flexibility and versatility .

Description

technical field [0001] The invention relates to the technical field, in particular to a method for identifying a final circuit breaker of a valve group based on a Dijkstra algorithm. Background technique [0002] The final circuit breaker of the converter station of the DC transmission system is a key circuit breaker connecting the DC valve group and the AC transmission line, mainly to prevent the sudden load shedding of the converter station from causing the overvoltage of the converter station. The insulation coordination problem caused by overvoltage is one of the issues that must be considered in the safe operation of the AC / DC hybrid system. The last circuit breaker is the key circuit breaker connecting the DC system to the AC system, and the tripping of the last circuit breaker will cause the DC system to be disconnected from the AC system. Since a large number of reactive power compensation devices on the converter bus cannot be removed immediately, the DC system wil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/10H02H1/00G06F17/16
CPCG06F17/16H02H1/0092H02H7/10
Inventor 童晓阳张广骁
Owner SOUTHWEST JIAOTONG UNIV
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