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Positive current traveling-wave principle component cluster analysis-based closing fault identification method

A technology of forward current and cluster analysis, which is applied in the direction of fault location, electrical components, emergency protection circuit devices, etc., and can solve the problems of insufficient traveling wave identification methods, etc.

Active Publication Date: 2015-11-25
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to improve the power supply reliability of single-phase reclosing lines and the stability of parallel operation of the system in view of the current situation that the current traveling wave identification method from closing to fault is not perfect enough, and proposes a method based on forward current traveling wave Closing-to-fault identification method based on principal component cluster analysis to solve the above problems

Method used

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  • Positive current traveling-wave principle component cluster analysis-based closing fault identification method
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  • Positive current traveling-wave principle component cluster analysis-based closing fault identification method

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: as figure 1 The simulation system model of 500kV transmission line shown, the line to be protected is MN, and the line length is L PM = 150km, L MN = 150km, L NQ =220km, the sampling rate is 1MHz. Assume that the A-phase circuit breaker at the N-terminal of the protected line is in the open state, and the A-phase circuit breaker at the M-terminal end of the protected line performs the closing operation, assuming that there is no fault in the line MN and that a phase-A ground fault occurs 149km away from the M-terminal , the transition resistance is 10Ω, and the initial phase angle is 60°.

[0027] The three-phase current traveling wave and the three-phase voltage traveling wave generated by the closing measurement terminal M of the line are collected. The three-phase voltage and three-phase current traveling waves are transformed into phase-mode using equations (1) and (2), and three line-mode voltage components Δu are extracted α , Δu β and Δu γ a...

Embodiment 2

[0033] Embodiment 2: as figure 1 The simulation system model of 500kV transmission line shown, the line to be protected is MN, and the line length is L PM = 150km, L MN = 150km, L NQ =220km, the sampling rate is 1MHz. Assume that the B-phase circuit breaker at the N-end of the protected line is in the open state, and the B-phase circuit breaker at the M-end of the protected line’s measurement end performs the closing operation, assuming that there is no fault in the line MN and a B-phase ground fault occurs 60km away from the M-end , the transition resistance is 50Ω, and the initial phase angle is 60°.

[0034] The three-phase current traveling wave and the three-phase voltage traveling wave generated by the closing measurement terminal M of the line are collected. The three-phase voltage and three-phase current traveling waves are transformed into phase-mode using equations (1) and (2), and three line-mode voltage components Δu are extracted α , Δu β and Δu γ and the ...

Embodiment 3

[0040] Embodiment 3: as figure 1 The simulation system model of 500kV transmission line shown, the line to be protected is MN, and the line length is L PM = 150km, L MN = 150km, L NQ =220km, the sampling rate is 1MHz. Assume that the A-phase circuit breaker at the N-end of the protected line is in the open state, and the A-phase circuit breaker at the M-end of the measured end of the protected line performs the closing operation, assuming that there is no fault in the line MN and a C-phase ground fault occurs 90km away from the M-end , the transition resistance is 10Ω, and the initial phase angle is 30°.

[0041] The three-phase current traveling wave and the three-phase voltage traveling wave generated by the closing measurement terminal M of the line are collected. The three-phase voltage and three-phase current traveling waves are transformed into phase-mode using equations (1) and (2), and three line-mode voltage components Δu are extracted α , Δu β and Δu γ and th...

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Abstract

The invention relates to a positive current traveling-wave principle component cluster analysis-based closing fault identification method, and belongs to the technical field of power system relay protection. According to the method, after a power transmission line is in a single-phase-to-ground fault, by a single-phase recloser, a positive current traveling-wave is constructed by line-mode current and line-mode voltage travelling waves which are obtained by a measurement end; principle component cluster analysis is carried out by absolute value data of the positive current traveling-wave within a fixed time window after closing; identification is carried out according to a projection value of sample data in a principle component analysis cluster space; if the projection value q1 is greater than a threshold value q1,set, a closing fault is judged; and if the projection value is less than or equal to q1,set, the condition that the circuit is free of a fault is judged. Simulation verification shows that the condition of a closing fault circuit can be reliably identified, and secondary impact to the circuit is avoided.

Description

technical field [0001] The invention relates to a method for identifying a switch from closing to a fault based on cluster analysis of principal components of forward current traveling waves, and belongs to the technical field of relay protection of electric power systems. Background technique [0002] In the power system, the closing operation of the transmission line circuit breaker can be divided into two cases: no-load closing at one end of the line and automatic reclosing. But no matter what the situation is, it is necessary for the relay protection to correctly and reliably identify the line condition. When there is a fault in the line, it should act quickly to cut off the faulty line, and the protection should not act when there is no fault. At present, there are still problems in using the principle of traveling wave protection to realize the correct and reliable identification of line conditions for traveling wave protection. In the early stage, traveling wave pol...

Claims

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Application Information

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IPC IPC(8): H02H7/26G01R31/08
Inventor 束洪春吕蕾杨竞及高利
Owner KUNMING UNIV OF SCI & TECH
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