Power distribution line single-phase earth fault positioning technology and self-healing decision-making method

Abstract

The invention discloses a power distribution line single-phase earth fault positioning technology and a self-healing decision making method, and the method comprises the steps: (1) building a grounding model for actual grounding recording data of a power distribution network through FFT and WPD, and extracting transient steady-state fault features; (2) carrying out high-speed sampling on the voltage and current of the line by the power distribution terminal, combining transient protection of wavelet packet transformation, and adopting a multi-time-window multi-protection algorithm to carry outweighted comprehensive grounding fault detection; (3) uploading the fault information to a main station by adopting a GPS/Beidou synchronization technology; and (4) arranging an integrated wide-areainformation decision module in the main station judges the position of a fault point according to the fault information of each power distribution terminal, positioning a fault section and giving an optimal self-healing decision method. According to the invention, transient state and steady state comprehensive detection of the grounding fault is realized, and the grounding protection level is improved; accurate positioning of a fault section is realized, an optimal self-healing scheme of a grounding fault is automatically formed, and a power failure surface is reduced.

Description

technical field [0001] The invention relates to a single-phase ground fault location technology and a self-healing decision-making method of a distribution line, belonging to the technical field of distribution network fault location and self-healing. Background technique [0002] More than 85% of power outages in my country are caused by distribution network faults, and single-phase ground faults account for 70% of them. Equipment and personal safety hazards, affecting power supply reliability. At present, there are dozens of different methods of grounding line selection devices hanging on the grid, but the application effect is generally not ideal. After a fault, manual inspection is required, it is difficult to quickly locate the fault and eliminate it, and the load is prone to power outages. The technical route of relying on local information and a single algorithm to deal with the distribution network grounding problem has certain limitations. Contents of the inventio...

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Problems solved by technology

[0002]More than 85% of power outages in my country are caused by distribution network faults, and single-phase ground faults account for 70% of them. After that, it can run for 1~2 hours, but it will bring a series of safety hazards involving equipment and personal, which will affect the reliability of power supply.

At present, there are dozens of different methods of grounding line selection devices hanging on the grid, but the application effect is generally not ideal. After a fault, manual inspection is required, it is difficult to quickly locate the fault and eliminate it, and the load is prone to power outages.

The technical route of relying on local information and a single algorithm to deal with the distribution network grounding problem has certain limitations

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