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A Single-Ended Fault Location Method for Lines Containing TCSC Based on the Distribution Characteristics of Fault Traveling Waves Along the Line

A technology of fault distance measurement and distribution characteristics, which is applied to the fault location, fault detection according to the conductor type, and electrical measurement. It can solve the problems of not being able to obtain the fault location and destroying the impedance uniformity of the entire transmission line.

Active Publication Date: 2019-07-05
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 Fault Location Method for Lines Containing TCSC Based on the Distribution Characteristics of Fault Traveling Waves Along the Line
  • A Single-Ended Fault Location Method for Lines Containing TCSC Based on the Distribution Characteristics of Fault Traveling Waves Along the Line
  • A Single-Ended Fault Location Method for Lines Containing TCSC Based on the Distribution Characteristics of Fault Traveling Waves Along the Line

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] Embodiment 1: with figure 1 Taking the transmission line shown as an example, a ground fault occurs 60km away from terminal M on the left side of the TCSC element.

[0105] 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 terminal); according to step 2, the voltage traveling wave is constructed by using the current traveling wave and wave impedance of the adjacent healthy 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 with and energy with According to step 6, construct the ranging function. get ranging function f uI (x...

Embodiment 2

[0106] Embodiment 2: with figure 1 Taking the transmission line shown as an example, a ground fault occurs at a distance of 140km from the M terminal on the right side of the TCSC element.

[0107] 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 with and energy with According to step 6, construct the ranging function. get ranging function f ...

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Abstract

The invention relates to a single-ended fault location method containing a TCSC line based on a fault traveling wave distribution characteristic along a line, and belongs to the technical field of relay protection of an electric power system. Firstly, an M-end high-speed acquisition device obtains fault current traveling wave data at a measurement terminal, and an adjacent sound line current traveling wave and wave impedance are used to construct a voltage traveling wave. Secondly, a line mode voltage traveling wave and a line mode current traveling wave are obtained through the phase mode transformation operation containing a fault phase. And then the distribution along the line of the saltations of the voltage and current traveling waves is calculated by using the Bergeron transmission equation according to the line mode current and the line mode voltage and by taking a calculation step length along the line of 0.1m. Finally in time windows of [t0, t0+l / (2v)] and [t0+l / (2v), t0+l / v], location functions fuI(x) and fuII(x) are obtained by carrying out the absolute value on the traveling wave saltations and carrying out integral, and the fault location is realized according to a location function saltation distribution rule along the line.

Description

technical field [0001] The invention relates to a single-end fault distance measurement method for a TCSC line 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. Since it takes a certain amount of time for the compensation device to respond to changes in operating conditions, it is feasible to use the fault traveling wave...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor 束洪春田鑫萃
Owner KUNMING UNIV OF SCI & TECH
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