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Method for reproducing power transmission line fault current traveling waveform based on multiband decomposition

A transmission line and fault current technology, applied in the direction of only measuring current, fault location, measuring current/voltage, etc., can solve the problems of more utilization of transmission line fault traveling wave waveform information and insufficient data mining.

Active Publication Date: 2016-11-09
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, more utilization and data mining of transmission line fault traveling wave waveform information have not been fully explored.

Method used

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  • Method for reproducing power transmission line fault current traveling waveform based on multiband decomposition
  • Method for reproducing power transmission line fault current traveling waveform based on multiband decomposition
  • Method for reproducing power transmission line fault current traveling waveform based on multiband decomposition

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Embodiment Construction

[0059] The preferred embodiments of the present invention will be given below in conjunction with the drawings and described in detail.

[0060] Created in PSCAD as figure 1 Transmission line model. The line adopts the frequency-dependent model, F is the lightning fault point, and three detection points are set up along the line 20km, 40km and 70km along the fault point in order to collect the fault current traveling wave waveform. The tower of the transmission line is a model of the actual tower ZB1.

[0061] The line was struck by lightning at point F in 0.2 seconds. A high-frequency pulse signal was used to simulate in pscad to generate transient current traveling waves propagating along the line. Attenuation and distortion were detected at downstream detection points 1, 2, and 3 respectively The current traveling wave waveform after figure 2 As shown, the sampling frequency of the traveling wave waveform is 1MHz.

[0062] by figure 2 It can be seen that after the failure of ...

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Abstract

The invention discloses a method for reproducing a power transmission line fault current traveling waveform based on multiband decomposition. The method is characterized by installing a fault traveling wave detection device on a power transmission line, setting an objective function based on a frequency-dependent model by virtue of a least square method according to fault point current traveling waves detected at two points, and obtaining a distribution parameter of the power transmission line by virtue of inversion by using a genetic algorithm which is an intelligent search algorithm; verifying the correctness of the distribution parameter by means of inversion of detection point waveform of another section of the same power transmission line and comparison, and accurately obtaining the fault current traveling waveform of any unknown point on the fault power transmission line via inversion by mean of the inversion method. The method has an absolute error not more than 3[mu]s and a relative error not more than 6%.

Description

Technical field [0001] The invention relates to the technical field of power transmission line fault equipment detection, in particular to a method for reproducing the traveling wave waveform of a power transmission line fault current based on multi-band decomposition. Background technique [0002] Transmission lines are the most fault-prone equipment in power systems. Scholars have conducted many studies on fault location and fault location of transmission lines. For transmission line failures, the defense capability can only be passively increased to reduce the probability of transmission line failures. However, in the application of the actual line partial reconstruction project, due to the lack of fault data as support, the reconstruction work cannot be targeted, thus wasting a lot of manpower and material resources. If the development process of the failure can be repeated to realize the visual status of the entire process of the transmission line failure, it has great prac...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R31/08
CPCG01R19/0092G01R31/085G01R31/088Y04S10/52
Inventor 刘亚东胡琛临梁函卿王小匆盛戈皞江秀臣
Owner SHANGHAI JIAO TONG UNIV