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A Method and System for Judging Fault Sections of Multi-Terminal Direct Current Transmission System Based on Polar Wave Energy

A technology for fault sections and power transmission systems, applied to fault locations, detecting faults according to conductor types, electrical components, etc., to achieve rapid identification, fast protection action, and cost-saving effects

Active Publication Date: 2021-08-17
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology

[0004] The present invention provides a method for judging the fault section of the multi-terminal direct current transmission system based on the polar wave energy to solve the problem of how to realize the judgment of the faulty section of the multi-terminal direct current transmission system based on the polar wave energy

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  • A Method and System for Judging Fault Sections of Multi-Terminal Direct Current Transmission System Based on Polar Wave Energy
  • A Method and System for Judging Fault Sections of Multi-Terminal Direct Current Transmission System Based on Polar Wave Energy
  • A Method and System for Judging Fault Sections of Multi-Terminal Direct Current Transmission System Based on Polar Wave Energy

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[0048] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0049] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...

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Abstract

The invention discloses a method for judging a fault section of a multi-terminal direct current transmission system based on polar wave energy: record the fault start time, collect the electric quantity in the time section including before and after the fault start time, and use the electric quantity to calculate the protection The linear mode components of the voltage and current at the installation site; according to the linear mode components of the voltage and current, calculate the extreme wave value of each sampling point in the time segment at the specified moment to protect the installation site; extract each sampling point in the time segment at any time Calculate the energy of the polar wavelet coefficient for the polar wavelet coefficient of the first layer; obtain the maximum energy value of the polar wave wavelet coefficient at the protection installation in the time zone, use the maximum energy value of the polar wave wavelet coefficient as a reference sampling point, and take at least One sampling point, calculate the energy sum of the polar wavelet coefficients of the reference sampling point and at least one sampling point; judge the energy sum of the polar wavelet coefficients, if the energy sum of the polar wavelet coefficients is greater than the preset setting value, then judge the faulty section In-zone failure.

Description

technical field [0001] The present invention relates to the technical field of power system protection, and more specifically, to a method and system for judging a faulty section of a multi-terminal direct current transmission system based on polar wave energy. Background technique [0002] In the multi-terminal DC power grid, due to the small damping value of the DC line and the direct interconnection of each converter station with the DC line, once a fault occurs anywhere in the DC field, all DC lines will quickly over-current. Therefore, the fast and reliable action of DC grid protection is an inevitable requirement for the development of DC grid. At present, in the existing HVDC transmission system, traveling wave protection has been widely used, but it has inherent shortcomings such as high sampling rate requirements and weak ability to withstand transition resistance; overcurrent protection has poor anti-transition resistance ability and requires DC disconnection The ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26H02H1/00G01R31/08
CPCG01R31/086H02H1/0007H02H7/268
Inventor 李伟周泽昕李斌李仲青王兴国杨国生艾淑云张逸帆夏烨王惠平何佳伟李晔
Owner CHINA ELECTRIC POWER RES INST
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