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A single-ended traveling wave ranging method for lines with statcom based on the distribution characteristics of fault traveling waves along the line

A distance measurement method and single-ended traveling wave technology, applied in the fault location, measuring electricity, measuring device and other directions, can solve the problem of not being able to obtain the fault location, destroying the impedance uniformity of the entire transmission line, etc.

Active Publication Date: 2020-04-03
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the compensation device in the line destroys the uniformity of the impedance of the transmission line, the single-ended impedance method of power frequency measurement often cannot obtain the correct fault location.

Method used

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  • A single-ended traveling wave ranging method for lines with statcom based on the distribution characteristics of fault traveling waves along the line
  • A single-ended traveling wave ranging method for lines with statcom based on the distribution characteristics of fault traveling waves along the line
  • A single-ended traveling wave ranging method for lines with statcom based on the distribution characteristics of fault traveling waves along the line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] Embodiment 1: with figure 1 Taking the transmission line shown as an example, a ground fault occurs at the left side of the STATCOM element 30km away from the M terminal.

[0099] According to step 1 in the manual, the traveling wave data with a time window length of 1.5l / v is obtained at the M terminal; according to step 2, the voltage traveling wave is constructed by using the current traveling wave and wave impedance of the adjacent sound line to obtain u M = i k × Z c ;According to step 3, calculate the distribution u of the voltage traveling wave and current traveling wave along the line x,s (x,t) and i x,s (x,t); According to step 4, calculate the forward traveling wave and reverse traveling wave u + x,s and u - x,s ;According to step 5, calculate and extract the sudden change of forward traveling wave and reverse traveling wave and and energy and According to step 6, construct the ranging function. get ranging function f uI (x), f uII (x). Obta...

Embodiment 2

[0100] Embodiment 2: with figure 1 Taking the transmission line shown as an example, a ground fault occurs at the right side of the TCSC element 70km away from the M terminal.

[0101] According to step 1 in the manual, the traveling wave data with a time window length of 1.5l / v is obtained at the measurement terminal M; according to step 2, the voltage traveling wave is constructed by using the current traveling wave and wave impedance of the adjacent sound line to obtain u M = i k × Z c ;According to step 3, calculate the distribution u of the voltage traveling wave and current traveling wave along the line x,s (x,t) and i x,s (x,t); According to step 4, calculate the forward traveling wave and reverse traveling wave u + x,s and u - x,s ;According to step 5, calculate and extract the sudden change of forward traveling wave and reverse traveling wave and and energy and According to step 6, construct the ranging function. get ranging function f uI (x), f uII ...

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Abstract

The invention relates to a STATCOM-contained line single-end traveling wave distance measurement method based on fault traveling wave line distribution characteristics, and belongs to the technical field of electric power system relay protection. When a line has a fault, a measuring end high-speed collection device obtains measuring end fault current travelling wave data, and voltage travelling waves are constructed by current travelling waves and wave impedance of an adjacent healthy line; secondly, phase-model conversion operation including a faulted phase is carried out to obtain line-model voltage travelling waves and line-model current travelling waves; according to line-model currents and line-model voltages, a Bergeron transmission equation is utilized to calculate the line distribution of voltage and current traveling wave abrupt changes, wherein a line calculation step is 0.1 m; and finally, in time windows [t0, t0+1 / (2v)] and [t0+1 / (2v), t0+1 / v], the absolute values of the traveling wave abrupt changes are calculated and then are integrated to obtain distance measurement functions fuI(x) and fuII(x), and distance measurement of the fault is realized according to the distribution rule of distance measurement function line abrupt changes.

Description

technical field [0001] The invention relates to a single-end traveling wave ranging method for a line containing STATCOM based on the distribution characteristics of fault traveling waves along the line, and belongs to the technical field of electric power system relay protection. Background technique [0002] Installing compensation equipment on ultra-high voltage transmission lines can enhance the steady-state transmission power capability of the line and improve the transient stability margin of the system through different compensation methods, optimize line power flow and reduce line loss, etc. Since the compensation device included in the line destroys the uniformity of the impedance of the transmission line, the single-ended impedance method of power frequency measurement often cannot obtain the correct fault location. Generally, STATCOM can be regarded as connected to the system through a connecting inductor (usually a transformer), and the output power to the system...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 束洪春田鑫萃
Owner KUNMING UNIV OF SCI & TECH
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