Power transmission line pilot protection method based on Kendall Tau coefficient

A transmission line, longitudinal protection technology, applied in circuit devices, emergency protection circuit devices, measuring electricity and other directions, can solve problems such as identifying faults

Active Publication Date: 2019-09-17
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention provides a kind of transmission line longitudinal protection method based on Kendall Tau coefficient, it can effectively solve the technical problem of identification fault line when characteristic sequence waveform change trend consistency

Method used

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  • Power transmission line pilot protection method based on Kendall Tau coefficient
  • Power transmission line pilot protection method based on Kendall Tau coefficient
  • Power transmission line pilot protection method based on Kendall Tau coefficient

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0101] Use PSCAD / EMTDC software to build an IEEE 10-machine 39-node system, such as figure 2 shown. figure 2 middle, Represent generator, T1~T9 represent transformer, B 1 ~B 39 is the serial number of each busbar, L 1 ~ L 33 is the number of each line, the system voltage level is 345kV, the frequency is 60Hz, and the sampling frequency is 3kHz. Set the fault in the IEEE 10-machine 39-node system, take out the fault data, and program in MATLAB to realize the protection algorithm.

[0102] (1) Validation of the algorithm

[0103] In order to verify the effectiveness of the proposed method, the figure 2 In the shown IEEE10 machine 39 node test system, set the line L 19 at distance from bus B 18 A two-phase ground fault (ABG) occurs at 0.3s at k1 point at 95% of image 3 and Figure 4 Give the fault line L respectively 19 and the adjacent normal line L 18 Phase A characteristic sequence waveforms at both ends.

[0104] At the fault instant, the fault line L 19 T...

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Abstract

The invention discloses a power transmission line pilot protection method based on a Kendall Tau coefficient, and relates to the technical field of power system relay protection. When an internal fault or an external fault occurs, currents on the two sides of the power transmission line MN have different characteristics. When an internal fault occurs, the current directions of the two sides of a faulty line are the same, the waveform change trends are the same, but the amplitude difference of current waveforms is large, and the current waveforms on the two sides have certain similarity and present a certain positive correlation. When an external fault occurs, the current directions of the two sides of the power transmission line MN are opposite, the current waveform change trends are opposite, the amplitudes of the current waveforms are approximately equal, and negative correlation exists between the current waveforms on the two sides. According to the obvious difference of current waveforms of faults inside and outside the line area, the Kendall Tau coefficient is used for representing and measuring the difference between characteristic sequence waveforms on the two sides of the line, a matched protection criterion of current waveforms is formed, and reliable identification of the fault line is achieved.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection. Background technique [0002] Pilot protection of transmission lines can quickly and selectively remove faults in the system, so it plays an important role in the transmission system. Among them, longitudinal direction protection and current differential protection are the most widely used. The longitudinal directional protection has good adaptability to load changes, system oscillation and non-full-phase operation. However, its directional element does not perform well in the case of strong power supply, high-impedance fault, and TV disconnection. The longitudinal current differential protection is not affected by the change of system operation mode and has absolute selectivity. However, its operating performance is susceptible to issues such as distributed capacitive current, CT saturation, and data synchronization. [0003] Aiming at some problems faced by co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/26H02H1/00G01R31/08
CPCG01R31/086G01R31/088H02H1/0007H02H7/26
Inventor 张广骁童晓阳
Owner SOUTHWEST JIAOTONG UNIV
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