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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
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Problems solved by technology

But at the same time, traveling wave protection and transient protection will also face more high-frequency interference. Lightning shock is the most important interference factor. Lightning strike failure is the lightning interference of transient protection.

Method used

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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

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Embodiment Construction

[0028] Simulation model such as figure 1 As shown in the figure, if lightning strikes the positive line 100km away from the M terminal, it 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 place, calculate the positive line pole voltage P 1 ( k )for

[0030]

[0031] In the formula, 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 DC 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 pole line voltage in steady state operation lambda

[0033]

[0034] In the formula, is the pole wave voltage, is the pole-to-line voltage during steady-state operation;

[...

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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.

Description

technical field [0001] The invention relates to the technical field of electric power system relay protection, in particular to a lightning interference identification method for ultra-high voltage direct current transmission using the average voltage average value of polar waves within a short window. Background technique [0002] Transmission line protection based on transient quantities should quickly identify faults and remove faults. But at the same time, traveling wave protection and transient protection will also face more high-frequency interference. Lightning shock is the most important interference factor. Lightning strike failure is the lightning interference of transient protection. The DC line protection using du / dt as the criterion of traveling wave protection is affected by lightning disturbance. Contents of the invention [0003] The object of the present invention is to provide a lightning interference identification method using the average sampling valu...

Claims

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Application Information

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IPC IPC(8): G01R31/08
Inventor 束洪春田鑫萃张广斌孙士云刘可真朱梦梦
Owner KUNMING UNIV OF SCI & TECH
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