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Direct current transmission line protection method based on mathematical morphological gradient and mathematical morphological entropy

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

Active Publication Date: 2019-03-19
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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  • Direct current transmission line protection method based on mathematical morphological gradient and mathematical morphological entropy
  • Direct current transmission line protection method based on mathematical morphological gradient and mathematical morphological entropy
  • Direct current transmission line protection method based on mathematical morphological gradient and mathematical morphological entropy

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Embodiment Construction

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

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

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

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

[0062]

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

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

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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 DC transmission line protection method based on mathematical form gradient and mathematical form entropy. Background technique [0002] Due to the advantages of simple asynchronous interconnection, low transmission loss, convenient system control and small short-circuit current, HVDC transmission technology plays an important role in long-distance and large-capacity transmission. However, since DC lines are exposed to complex and harsh environments, DC line failure phenomena are 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. [0003] At present, traveling ...

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Application Information

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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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