A Protection Method for DC Transmission Lines Based on Mathematical Morphology Gradient and Mathematical Morphology Entropy

A technology of direct current transmission lines and mathematical forms, applied in the direction of measuring electricity, measuring electrical variables, instruments, etc., can solve the problems of slow recognition speed, poor resistance to high resistance, etc., achieve accurate and fast filtering, eliminate the influence of noise singularities, Effects with strong ability to handle nonlinear signals

Active Publication Date: 2020-02-18
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcomings and deficiencies of the existing methods for high-voltage DC protection, and propose a DC transmission line protection method based on mathematical morphological gradient and mathematical morphological entropy. For the problem of slow speed, using mathematical morphology to construct protection schemes can realize fast and accurate identification of HVDC transmission line faults

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  • A Protection Method for DC Transmission Lines Based on Mathematical Morphology Gradient and Mathematical Morphology Entropy
  • A Protection Method for DC Transmission Lines Based on Mathematical Morphology Gradient and Mathematical Morphology Entropy
  • A Protection Method for DC Transmission Lines Based on Mathematical Morphology Gradient and Mathematical Morphology Entropy

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Embodiment Construction

[0058] The present invention will be further described below in conjunction with specific embodiments.

[0059] like figure 1 As shown, the DC transmission line protection method based on mathematical morphology gradient and mathematical morphology entropy provided by this embodiment includes the following steps:

[0060] 1) Collect the DC line voltage signal, and perform line-to-line conversion on the voltage signal.

[0061] Due to the electromagnetic coupling of the positive and negative lines, the line-mode conversion of the two-pole voltage signal becomes two independent components. The change formula is:

[0062]

[0063] Among them, U 1 is the line-mode voltage, U 0 is the ground mode voltage, U a and U b are the positive and negative voltages, respectively.

[0064] 2) Construct an improved morphological filter to filter out the noise singularities in the line mode voltage signal, and perform multi-scale morphological gradient processing, and construct the fau...

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Abstract

The invention discloses a direct current transmission line protection method based on mathematical morphological gradient and mathematical morphological entropy, which comprises the following steps: 1) acquiring a direct current line voltage signal and carrying out line-mode conversion on the voltage signal; 2) constructing an improved morphological filter, filtering out noise singular points in aline mode voltage signal, performing multi-scale morphological gradient processing, and constructing a fault starting criterion according to the processing result; 3) carrying out multi-scale mathematical morphological gradient processing on the fault signals, constructing mathematical morphological entropy, a fault criterion of an inner region and an outer region and a fault criterion of an anode and a cathode by utilizing mathematical morphological gradient processing results under different scales. The direct current transmission line protection method based on mathematical morphological gradient and mathematical morphological entropy can quickly filter out the noise singular points in the signal, and quickly and accurately achieve fault identification through multi-scale mathematicalmorphological gradient and morphological entropy.

Description

technical field [0001] The invention relates to the technical field of fault diagnosis and relay protection, in particular to a direct current transmission line protection method based on mathematical shape gradient and mathematical shape entropy. Background technique [0002] Due to the advantages of simple asynchronous interconnection, low transmission loss, easy system control and small short-circuit current, HVDC transmission technology plays an important role in long-distance and large-capacity transmission. However, due to the complex and harsh environment that DC lines are exposed to, the phenomenon of DC line failures is not uncommon. Statistics show that DC line faults account for about 36.8% of DC transmission system faults, which means that the existing current protection algorithms are less reliable. Therefore, the DC transmission system needs to be equipped with reliable line protection to reliably cut off the fault and prevent the fault from spreading. [000...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/088
Inventor 季天瑶林伟斌李梦诗吴青华
Owner SOUTH CHINA UNIV OF TECH
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