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A single-phase-to-ground fault location method in distribution network based on matching pursuit

A single-phase ground fault, matching tracking technology, applied in the fault location, detecting faults according to conductor types, measuring electricity and other directions, to achieve the effect of fast and accurate extraction and expansion of the range of signal description

Active Publication Date: 2019-12-03
HAINAN POWER GRID CO LTD ELECTRIC POWER RES INST +1
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Problems solved by technology

These classic non-adaptive algorithms often use the expansion of limited orthogonal basis functions to represent the actual complex signal, so the non-adaptive algorithm has limitations

Method used

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  • A single-phase-to-ground fault location method in distribution network based on matching pursuit
  • A single-phase-to-ground fault location method in distribution network based on matching pursuit
  • A single-phase-to-ground fault location method in distribution network based on matching pursuit

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Embodiment Construction

[0039] In order to better understand the technical content of the present invention, specific embodiments are provided below, and the present invention is further described in conjunction with the accompanying drawings.

[0040] see figure 1 , a method for locating single-phase-to-ground faults in a distribution network based on matching pursuit, characterized in that it includes the following steps:

[0041] S1. Constructed a complete atomic library;

[0042] S2. Collect the transient ground current signal f of different sections through the PMU, and extract the attenuated DC component i respectively L ;

[0043] S3. Perform sparse decomposition on the transient ground current signal f of a section based on the over-complete atomic library;

[0044] S6. Based on the decomposition result, select corresponding atoms that meet the characteristics of the attenuated DC component in the over-complete atomic library;

[0045] S7. Sparsely decompose the transient ground current s...

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Abstract

The invention provides a power-distribution-network single-phase grounding fault positioning method based on matching pursuit. The method is characterized by carrying out sparse expression on a transient grounding current through an atomic sparse decomposition theory; extracting an attenuation direct current component to divide a fault path; and further positioning a fault point. By using an adaptive atomic sparse decomposition theory, the limitations of a traditional non-adaptive algorithm can be avoided and a signal description range is enlarged, and the method is suitable for complex grounding transient signal decomposition. Through matching a tracking algorithm, an attenuation direct current component can be rapidly and accurately extracted, and on-line section positioning is realizedthrough combining a power distribution network topology structure.

Description

technical field [0001] The invention relates to the technical field of distribution network fault location, in particular to a single-phase ground fault location method for distribution network based on matching tracking. Background technique [0002] When a single-phase ground fault occurs in a small current grounding system, its transient voltage and current signals contain rich time domain and frequency domain characteristics. The transient ground current includes capacitive and inductive components. From the equivalent circuit diagram, it is easy to obtain that the transient capacitive current flows through the fault path and the non-fault path, and the inductive current is only distributed on the fault path. If the inductive current component can be quickly and accurately extracted from the transient ground current at each node of the distribution network, combined with the topology structure, the online section location of the fault point can be realized. The main man...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/08
CPCG01R31/086G01R31/088
Inventor 方连航林道鸿万信书吴强梁钰刘红岩林明健
Owner HAINAN POWER GRID CO LTD ELECTRIC POWER RES INST
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