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High-voltage capacitor imbalance protecting method for high-voltage DC transmission system

A technology for high-voltage capacitors and power transmission systems, applied in DC network circuit devices, emergency protection circuit devices, instruments, etc., can solve problems such as hidden dangers of safe and stable operation of high-voltage capacitors, and achieve the effect of enhancing adaptability and improving reliability.

Active Publication Date: 2010-07-14
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The actual operation shows that the capacitor unbalance protection based on this principle has refused to operate several times when a small number of components inside the capacitor are damaged, which has brought hidden dangers to the safe and stable operation of high-voltage capacitors.

Method used

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  • High-voltage capacitor imbalance protecting method for high-voltage DC transmission system
  • High-voltage capacitor imbalance protecting method for high-voltage DC transmission system
  • High-voltage capacitor imbalance protecting method for high-voltage DC transmission system

Examples

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Embodiment

[0041] The method for unbalanced protection of high-voltage capacitors in a high-voltage direct current transmission system of the present invention comprises the following steps:

[0042] 1) Analyze the unbalanced current when the high-voltage capacitor of the HVDC transmission system breaks down during the fault development process;

[0043] 2) Judging the symmetrical or asymmetrical fault of the high-voltage capacitor of the HVDC transmission system;

[0044] 3) For symmetrical and asymmetrical faults, put forward corresponding setting principles and action strategies.

[0045] The above-mentioned high-voltage capacitors include capacitors in the form of H-shaped connections and capacitors in the form of branch connections. The specific wiring of capacitors in the form of H-shaped wiring is attached Picture 1-1 As shown, C1-C4 in the figure is a capacitor branch circuit connected by multiple capacitive elements in a certain series-parallel manner, TA dCurrent transformer...

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Abstract

The invention relates to a high-voltage capacitor imbalance protecting method for a high-voltage DC transmission system, comprising the following steps of: (1) analyzing imbalance current of a high-voltage capacitor in breakdown of a capacitor element during failure development in a high-voltage DC transmission system; (2) judging a symmetrical or dissymmetrical failure of the high-voltage capacitor in the high-voltage DC transmission system; and (3) proposing a corresponding setting principle and an action strategy aiming at the symmetrical or dissymmetrical failure. The high-voltage capacitor imbalance protecting method for a high-voltage DC transmission system has simple structure, convenience and practicability.

Description

technical field [0001] The invention belongs to the technical field of relay protection for high-voltage direct current transmission systems, in particular to a method for unbalanced protection of high-voltage capacitors in high-voltage direct current transmission systems, and belongs to an innovative technology for unbalanced protection methods for high-voltage capacitors in high-voltage direct current transmission systems. Background technique [0002] In the investment of the AC / DC filter of the high voltage direct current transmission system (referred to as the HVDC (High Voltage Direct Current) system), the investment of the high voltage capacitor accounts for the majority. The high-voltage capacitors of the AC / DC filter bear the power frequency voltage drop of the AC bus and the DC voltage drop of the DC line respectively. In addition, they also bear most of the harmonic voltage drop. When there are components in the high-voltage capacitor short circuit or open circuit,...

Claims

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Application Information

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IPC IPC(8): H02H7/16H02J1/00G01R31/00G01R29/16
Inventor 李银红傅创梅念黎小林饶宏李鸿鑫刘登峰左剑
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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