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A Transmission Line Fault Detection Method Based on Spearman Correlation Coefficient

A technology of correlation coefficient and fault detection, which is applied in the direction of fault location, fault detection according to conductor type, measurement of electricity, etc., can solve the problems of insufficient sensitivity and achieve the effects of low synchronization requirements, fast action speed, and insensitive abnormal data

Active Publication Date: 2020-02-07
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

[0007] The purpose of the present invention is to provide a transmission line fault detection method based on Spearman's correlation coefficient, which can effectively solve the problem of insufficient sensitivity of the protection algorithm in the case of high-impedance ground fault, abnormal sampling value, information asynchronous, CT saturation, etc. question

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  • A Transmission Line Fault Detection Method Based on Spearman Correlation Coefficient
  • A Transmission Line Fault Detection Method Based on Spearman Correlation Coefficient
  • A Transmission Line Fault Detection Method Based on Spearman Correlation Coefficient

Examples

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Embodiment

[0059] Use the electromagnetic transient simulation software PSCAD / EMTDC to build the IEEE39 node system, the system structure is as follows figure 2 Shown. figure 2 The G with a circle in the middle represents the generator, and the serial numbers 1 to 39 are the numbers of each bus. The system voltage level is 345kV, the frequency is 60Hz, and the sampling frequency is 3kHz. Set the fault in the IEEE39 node system, take out the fault data, and program the fault line detection algorithm in MATLAB.

[0060] In the following calculation example, AG represents a phase A ground fault, ABG represents a two-phase ground short-circuit fault A and B, AB represents a short-circuit fault between A and B phases, and ABC represents a three-phase A, B, and C short-circuit fault.

[0061] Example 1

[0062] In the IEEE39 node system, the line L17-18 is set to fail at 5%, 50%, and 95% of the bus 17 respectively. The fault types are AG, ABG, AB, ABC, among which a transition resistance of 300Ω i...

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Abstract

The invention discloses a transmission line fault detection method based on Spearman's correlation coefficient. Collect the instantaneous value of the three-phase current on both sides of the line at each moment, calculate and obtain the instantaneous value of the positive sequence fault component, negative sequence, and zero sequence current on both sides of the line, and construct the comprehensive current of the fault component on one side of the line as the positive sequence current at the same time The superposition of instantaneous values ​​of fault component current, negative sequence current and zero sequence current. Taking one cycle as the time window, using the comprehensive current of the fault component in the time window, constructing two characteristic sequences of a certain line, and calculating the Spearman correlation coefficient between the two characteristic sequences. The Spearman correlation coefficient of the line is calculated every time the time window moves forward. When the correlation coefficient is greater than the threshold value 0, the line is judged as a faulty line. This method is not affected by transition resistance, abnormal data, current transformer saturation, etc., and can detect faulty lines even in non-full-phase operation and power flow transfer, and has low requirements for information synchronization.

Description

Technical field [0001] The invention relates to the technical field of fault detection of power transmission lines of a power grid. Background technique [0002] Most of the existing protection algorithms are based on the fundamental phasor system, using the Fourier algorithm to obtain the power frequency phasor and then performing protection calculations, but the Fourier algorithm will be affected by the attenuated DC component in the fault current, and the protection action speed will be filtered. The limitation of the algorithm data window also has problems such as insufficient anti-interference ability. In response to the above problems, domestic and foreign scholars have begun to study protection algorithms based on the instantaneous value of current waveforms. However, in the case of high-resistance ground faults, abnormal sampling values, asynchronous information, current transformer (CT) saturation, etc., there are existing fault detection algorithms There are certain de...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/085G01R31/088
Inventor 童晓阳温豪
Owner SOUTHWEST JIAOTONG UNIV