Self-adaptive lightning stroke interference identification method by using pole line voltage traveling wave

A technology of interference identification and voltage traveling wave, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc. The effect of simple method and easy extraction

Active Publication Date: 2015-12-16
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the lightning surge that did not cause the flashover of the line insulator, for the line relay protection, there is a large transient energy disturbance on the line in the short time window after the lightning strike. For the case of no delay link and the fault data of the short time window No matter how high or low its sampling rate is, the relay protection of
[0003] The current traveling wave protection sampling rate of DC transmission lines is 10kHz, and the judgment is extended by 5 sampling intervals. It is short-window transient protection, but lightning interference is not considered, and lightning interference identification components are not configured. In theory, lightning interference causes The risk of false activation and misjudgment of traveling wave protection, operating experience also shows that HVDC line lightning interference sometimes causes misjudgment and misresponse of existing traveling wave main protection

Method used

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  • Self-adaptive lightning stroke interference identification method by using pole line voltage traveling wave
  • Self-adaptive lightning stroke interference identification method by using pole line voltage traveling wave
  • Self-adaptive lightning stroke interference identification method by using pole line voltage traveling wave

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: The simulation system of ±800kV DC transmission line is as follows figure 1 shown. A lightning strike occurred 550km away from the M terminal on the positive line, and the lightning protection line was not faulty.

[0033] According to the above step (3), the pole-line voltage within the 1ms time window of the test data is projected on the PCA space, and the test data is obtained in the PCA space. 1 Axis and PC 2 The projected value of (q′ 1 ,q′ 2 ).

[0034] According to step (4), the projection value of the test data (q' 1 ,q′ 2 ) and each cluster center N 1 (q 1 ,q 2 ), N 2 (q 1 ,q 2 ), N 3 (q 1 ,q 2 ) and N 4 (q 1 ,q 2 ) Euclidean distances are d 1 =4.9617×10 4 , d2 =4.0782×10 4 , d 3 =3.2984×10 4 , d 4 = 446.8166. According to step (5) and step (6), get d min = d 4 , it can be judged that it is lightning strike interference.

Embodiment 2

[0035] Embodiment 2: The simulation system of ±800kV DC transmission line is as follows figure 1 shown. A lightning strike occurs at a distance of 980km from the M terminal to the positive pole line, and the lightning protection line is not faulty.

[0036] According to the above step (3), the pole-line voltage within the 1ms time window of the test data is projected on the PCA space, and the test data is obtained in the PCA space. 1 Axis and PC 2 The projected value of (q′ 1 ,q′ 2 ).

[0037] According to step (4), the projection value of the test data (q' 1 ,q′ 2 ) and each cluster center N 1 (q 1 ,q 2 ), N 2 (q 1 ,q 2 ), N 3 (q 1 ,q 2 ) and N 4 (q 1 ,q 2 ) Euclidean distances are d 1 =2.2249×10 4 , d 2 =1.1328×10 4 , d 3 =4.4948×10 4 , d 4 =2.9831×10 4 . According to step (5) and step (6), get d min = d 2 , it can be judged that it is a lightning strike fault.

Embodiment 3

[0038] Embodiment 3: The simulation system of ±800kV DC transmission line is as follows figure 1 shown. The positive line is 120km away from the M terminal, and the lightning protection line is not faulty.

[0039] According to the above step (3), the pole-line voltage within the 1ms time window of the test data is projected on the PCA space, and the test data is obtained in the PCA space. 1 Axis and PC 2 The projected value of (q′ 1 ,q′ 2 ).

[0040] According to step (4), the projection value of the test data (q' 1 ,q′ 2 ) and each cluster center N 1 (q 1 ,q 2 ), N 2 (q 1 ,q 2 ), N 3 (q 1 ,q 2 ) and N 4 (q 1 ,q 2 ) Euclidean distances are d 1 =4.7967×10 4 , d 2 =4.007×10 4 , d 3 =100.7772, d 4 =3.5452×10 3 . According to step (5) and step (6), get d min = d 3 , it can be judged that it is lightning strike interference.

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Abstract

The invention relates to a self-adaptive lightning stroke interference identification method by using pole line voltage traveling wave, and belongs to electric power system direct current power transmission line relay protection technology field. Simulation traversal is carried out every 10km of the line to obtain a voltage waveform of lightning stroke interference and lightning stroke fault with a lightning stroke lead and a lightning conducter, and the voltage waveform curve is projected in a PCA space; and lightning stroke interference identification elements with different PCA structures are distributed. When the line is suffering from a lightning stroke, the obtained pole line voltage curve is projected in the PCA space; the Euler's distance tolerance is used to test the distance dmin between the PCA projection and the PCA space cluster center of the sample curve cluster obtained by simulation; and the lightning stroke interference and the lightning stroke fault are determined by valuing the dmin. A lot of simulation verification shows that the method has a good effect and high reliability.

Description

technical field [0001] The invention relates to a method for identifying lightning strike interference by using pole-line voltage traveling waves for principal component analysis, and belongs to the technical field of relay protection for DC transmission lines in power systems. Background technique [0002] Usually, lightning is harmful to high-voltage and ultra-high-voltage transmission lines when the lightning falls directly on the line, that is, direct lightning strikes. If the lightning directly strikes the HVDC line and causes the line insulator to flashover, it is said that the line has a lightning strike fault; if the lightning strikes the line and does not cause the line insulator to flashover, it means that the lightning strike line is not faulty. The lightning current surge injected at the lightning point of the line without lightning strike on the line is lightning interference to the line relay protection. Generally speaking, lightning interference has a great i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/00
Inventor 束洪春郑蔚晨田鑫萃
Owner KUNMING UNIV OF SCI & TECH
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