Method for recognizing lightning interference by utilizing average sampling value of short-window inner polar wave

A technology of lightning interference and identification method, which is applied in the direction of fault location, etc., to achieve the effect of good robustness, strong practicability, and strong performance

Active Publication Date: 2011-08-17
KUNMING UNIV OF SCI & TECH
4 Cites 3 Cited by

AI-Extracted Technical Summary

Problems solved by technology

But at the same time, traveling wave protection and transient protection will also face more high-frequency interference. Lightnin...
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Abstract

The invention relates to a method for recognizing lightning interference by utilizing an average sampling value of a short-window inner polar wave, comprising the steps of: after a protection element starts, solving polar wave voltage according to polar line voltage and polar line current which are obtained through measurement at a relay installed place and according to formulas; directly utilizing the sampling values of the polar wave voltage and the steady-state polar line voltage in a short window; solving a ratio of the polar wave voltage to the polar line voltage which runs in a steady state; and recognizing the lightning interference by utilizing the size of the ratio, wherein the sampling frequency is 10kHz, the time widow is 5ms, the sampling is not influenced by a control system,and the time-delay protection is in a ms level. By utilizing the method, the lightning interference in a full-length range of a line can be accurately recognized. The method has good robustness, verystrong performance of tolerating a transition resistance and stronger practicality and is not influenced by the interference. Proved by vast simulation results, the method provided by the invention has good effect.

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  • Method for recognizing lightning interference by utilizing average sampling value of short-window inner polar wave
  • Method for recognizing lightning interference by utilizing average sampling value of short-window inner polar wave
  • Method for recognizing lightning interference by utilizing average sampling value of short-window inner polar wave

Examples

  • Experimental program(1)

Example Embodiment

[0028] Simulation model such as figure 1 As shown, a lightning strike to the positive line at a distance of 100km from the M terminal is a fault. The time window length is 5ms and the sampling frequency is 10kHz.
[0029] (1) According to the DC voltage and DC current measured at the protection installation, find the positive line pole wave voltage P 1 ( k )for
[0030]
[0031] Where Z p Is the polar wave impedance of the DC transmission line, u 1 ( k ) Is the positive DC voltage, i 1 ( k ) Is the positive direct current, u 2 ( k ) Is the negative DC voltage, i 2 ( k ) Is the negative DC current, k =1, 2, 3.... N , N Is the length of the sampling sequence;
[0032] (2) According to the formula, calculate the ratio of the average pole-wave voltage to the steady-state pole-line voltage λ
[0033]
[0034] Where Is the polar wave voltage, Is the pole line voltage during steady state operation;
[0035] (3) The ratio of the average polar wave voltage to the steady-state polar line voltage =0.8, it is judged that the lightning strike is not faulty.
[0036] In the present invention, the PSCAD simulation software is used to figure 1 A simulation experiment is shown to verify the criterion proposed in this paper. With different transition resistances, the ratio of the average polar wave voltage to the steady-state polar line voltage λ Distributed along the line like image 3 Shown.
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