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Reproducibility Method of Traveling Wave Waveform of Transmission Line Fault Current Based on Wave Weight

A transmission line and fault current technology, which is applied in the directions of fault location, fault detection according to conductor type, electrical digital data processing, etc., can solve the problems of more utilization of transmission line fault traveling wave waveform information and insufficient data mining.

Active Publication Date: 2018-06-19
SHANGHAI JIAOTONG UNIV
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  • Summary
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  • 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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  • Reproducibility Method of Traveling Wave Waveform of Transmission Line Fault Current Based on Wave Weight
  • Reproducibility Method of Traveling Wave Waveform of Transmission Line Fault Current Based on Wave Weight
  • Reproducibility Method of Traveling Wave Waveform of Transmission Line Fault Current Based on Wave Weight

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Embodiment Construction

[0058] Below in conjunction with the drawings, preferred embodiments of the present invention are given and described in detail.

[0059] Created in PSCAD as figure 1 model of the transmission line. The line adopts the frequency-dependent model, F is the lightning fault point, and three detection points are set up along the fault point at 20km, 40km and 70km in turn for the collection of fault current traveling wave waveforms. The tower of the transmission line is a model of the actual tower ZB1.

[0060] The line was struck by lightning at point F at 0.2 seconds. A high-frequency pulse signal was used for simulation 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 subsequent traveling current waveform is as figure 2 As shown, the sampling frequency of the traveling wave waveform is 1MHz.

[0061] Depend on figure 2 It can be seen that...

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Abstract

The invention discloses a power transmission line fault current traveling-wave waveform recurrence method based on wave weights. A fault traveling-wave detecting device is installed on a power transmission line, a frequency-dependent model based objective function is firstly set by adopting a least square method according to fault point current traveling waves detected by two of points, and distribution parameters of the power transmission line are inverted out by adopting an intelligent search algorithm simulated annealing algorithm. The correctness of the distribution parameters is verified by inverting waveforms of detection points of another section of the same line and comparing the waveforms with really detected waveforms, and finally fault current traveling-wave waveforms of any known points on a faulted line can be accurately inverted by adopting the inversion method. An absolute error of the method does not exceed 3 microseconds, and a relative error does not exceed 6%.

Description

technical field [0001] The invention relates to the technical field of transmission line fault equipment detection, in particular to a method for reproducing traveling wave waveforms of transmission line fault currents based on wave weights. 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 faults, the defense capability can only be passively increased to reduce the probability of transmission line failures. However, in the application of local reconstruction projects of actual lines, due to the lack of fault data as support, the reconstruction work cannot be targeted, thus wasting a lot of human and material resources investment. If the development process of the fault can be replayed, the status and situation of the entire process of the transmission line fault can be visualized, which will have great pr...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08G06Q50/06G06F17/50G06F17/15
CPCG01R31/085G06F17/15G06Q50/06G06F30/367Y04S10/52
Inventor 刘亚东胡琛临梁函卿张烁盛戈皞江秀臣
Owner SHANGHAI JIAOTONG UNIV