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Method for increasing current converter protection region for extra-high voltage converter station

A protection area and converter technology, applied in emergency protection circuit devices, conversion devices for converting AC power input to DC power output, and output power, etc., can solve the problem of high failure rate and complex UHV DC wall bushing technology , manufacturing difficulty, etc., to achieve the effect of improving safety and reliability, increasing the range of differential protection, and reducing the operation of transferring to the metal return line

Active Publication Date: 2016-04-06
STATE GRID CORP OF CHINA +1
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AI Technical Summary

Problems solved by technology

[0002] UHV DC wall-piercing bushings are complex in technology, difficult to manufacture, and have a high failure rate. The fault of the wall-piercing bushing in the valve hall belongs to the fault in the pole bus area. The DC pole bus differential protection operates, and the DC blocking pole

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  • Method for increasing current converter protection region for extra-high voltage converter station

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Embodiment Construction

[0007] A method for increasing the protection area of ​​a converter in an UHV converter station, comprising the following steps: first, the photocurrent transformer in the valve hall is moved to the outside of the PLC reactor in the DC field, thereby incorporating the DC wall bushing of the converter into the Protective area of ​​the converter. When both poles of the UHV converter station are operated with double converters, the communication between the converter stations at both ends is normal and the active power control mode of each pole of the two stations is in the bipolar power control mode, that is, each All poles are assigned the same current reference value, and if the operating voltages of both poles are equal, the transmitted power of each pole is equal. After one of the DC wall bushings of the converter fails, the single pole where the faulty converter is located is first blocked to realize arc extinguishing at the fault point, and after the faulty converter is is...

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Abstract

The invention relates to a method for increasing a current converter protection region for an extra-high voltage converter station. The method is characterized by comprising the following steps: firstly, moving an optic current transformer on a direct current wall bushing valve hall side to the outer side of a direct current field PLC electric reactor so as to enable the wall bushing to be in the protection region of the current converter; when the double poles of the extra-high voltage converter station are both dual current converters in operating, the communication between the two ends of the converter stations is normal, and the active power control mode of the each pole of the two stations is under the dual-pole power control mode; after the direct current wall bushing of one current converter is in failure, the single pole of the fault current converter is locked firstly for realizing arc blowout of the fault point; after the fault current converter is isolated, the normal current converters are started for realizing balance operation of the dual-pole three-current-converters. The method can be applied to all extra-high voltage converter stations in operation; and after the direct current wall bushing of a single current converter is in failure in a dual-pole four-valve-group operation, new operation logic is implemented so as to ensure the stable operation of the direct current system.

Description

technical field [0001] The invention relates to a method for increasing the protection area of ​​a converter in an ultra-high voltage converter station. Background technique [0002] The UHV DC wall bushing is complex in technology, difficult to manufacture, and has a high failure rate. The fault of the valve hall wall bushing belongs to the pole bus area fault, the DC pole bus differential protection action, and the DC blocking pole. For example, since 2015, DC wall bushing external insulation flashover and internal insulation flashover have occurred in Zhongzhou Station and Jinhua Station respectively, resulting in two single-pole lockouts. Contents of the invention [0003] The purpose of the present invention is to provide a method for increasing the protection area of ​​the converter of the UHV converter station, which can improve the safety and reliability of the overall operation of the converter station, and avoid the grounding caused by the unipolar operation of t...

Claims

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Application Information

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IPC IPC(8): H02H7/12H02H7/26H02M1/00H02M7/00
CPCH02H7/12H02H7/26H02M1/00H02M7/003
Inventor 韦鹏史磊张立明刘若鹏朱颖高海洋窦俊廷李宁宋海龙王豪舟柴斌吕军高梓栩雷战斐刘钊刘书吉祁迎宾宁复茂谢伟锋
Owner STATE GRID CORP OF CHINA
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