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DC Commutation Failure Discrimination Method Considering AC-DC Interaction

An AC-DC interaction and commutation failure technology is applied in the field of DC commutation failure judgment considering AC-DC interaction, which can solve the problems of long time consumption and low AC-DC cascading failure accuracy, and achieve high accuracy and fast operation speed. Effect

Active Publication Date: 2021-11-16
CHINA ELECTRIC POWER RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] This application aims to solve the problem of low accuracy and long time-consuming when searching for possible AC-DC cascading faults caused by AC faults in multi-infeed AC-DC hybrid power systems in the prior art

Method used

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  • DC Commutation Failure Discrimination Method Considering AC-DC Interaction
  • DC Commutation Failure Discrimination Method Considering AC-DC Interaction
  • DC Commutation Failure Discrimination Method Considering AC-DC Interaction

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Embodiment Construction

[0017] 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.

[0018] 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 DC commutation failure considering AC-DC interaction, including: k Occurs, at least one DC link D in the grid where commutation failure occurs kj , where j is a positive integer greater than or equal to 1, the DC circuit D kj DC circuit for direct commutation failure; for each of the DC circuits D kj , identified in the AC fault mode F k occurs, and in the DC link D kj When commutation fails, at least one DC link H in the power grid where commutation fails kji , the DC loop H kji DC link for secondary commutation failure. The discriminant method has fast calculation speed and high accuracy.

Description

technical field [0001] The invention belongs to the field of power system safety and stability analysis, and more specifically relates to a method for judging DC commutation failure considering AC-DC interaction. Background technique [0002] In recent years, DC transmission projects have developed rapidly in my country. The multi-infeed DC transmission system with the receiving end on the same AC grid has been formed in the grid, forming a number of ultra-large-scale multi-infeed AC-DC hybrid power systems. system. A fault in the AC system may cause commutation failures in multiple converter stations at the same time, which will have a serious impact on system stability. [0003] Tracking the operation mode of the power grid and quickly searching online for AC-DC cascading faults that may cause multiple DC simultaneous commutation failures is of great significance to guide the operation of the power grid. The existing method uses simulation scanning, which requires a large...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/00
CPCG01R31/00
Inventor 吕颖谢昶田芳沙倩雨马超王轶禹于之虹姚伟锋冯长有解梅鲁广明戴红阳康建东史东宇高波
Owner CHINA ELECTRIC POWER RES INST