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Method and system for judging fault section of multi-terminal DC transmission system based on polar wave energy

A technique for fault sections, transmission systems, applied in the direction of fault locations, detection of faults by conductor type, electrical components, etc.

Active Publication Date: 2018-09-18
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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  • Method and system for judging fault section of multi-terminal DC transmission system based on polar wave energy
  • Method and system for judging fault section of multi-terminal DC 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 DC transmission system based on polar wave energy. The method comprises the steps of: recording a fault start moment, acquiring electrical quantities in time segments before and after the fault start moment, and calculating aerial mode components of a voltage and a current at a protection installation part by utilizing the electrical quantities; calculating a polar wave value of each sampling point at a designated moment at the protection installation part in the time segments according to the aerial mode components of the voltage and the current; extracting a polar wave wavelet coefficient of each sampling point at an arbitrary layer in the time segments, and calculating polar wave wavelet coefficient energy;acquiring the maximum value of the polar wave wavelet coefficient energy at the protection installation part in the time segments, regarding the maximum value of the polar wave wavelet coefficient energy as a reference sampling point, taking at least one sampling point after the reference sampling point, and calculating a sum of the polar wave wavelet coefficient energy of the reference samplingpoint and the at least one sampling point; and judging the sum of the polar wave wavelet coefficient energy, and determining the fault section as an intra-cell fault if the sum of the polar wave wavelet coefficient energy is greater than a setting value set in advance.

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 Applications(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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