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Online switch-off device and method for hybrid direct-current transmission system converter

A power transmission system, hybrid DC technology, applied in power transmission AC network and other directions, can solve problems such as lack of versatility

Active Publication Date: 2019-02-15
NR ELECTRIC CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN106655125A proposes a method based on a single-valve group online input and exit in a hybrid DC system. The proposed method uses a voltage source converter with a full-bridge sub-module, which is not suitable for a voltage source with a half-bridge sub-module. type converter, not universal

Method used

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  • Online switch-off device and method for hybrid direct-current transmission system converter
  • Online switch-off device and method for hybrid direct-current transmission system converter
  • Online switch-off device and method for hybrid direct-current transmission system converter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] The control unit specifically performs the following steps when the discrimination unit detects that the hybrid direct current transmission system needs to perform an online exit operation of the converter:

[0095] The rectifier performs the following steps:

[0096] (1) Control the operation of the rectification converter station to increase the trigger angle to 90 degrees or more;

[0097] (2) Control the thyristor bypass pair in the rectifier station;

[0098] (3) The parallel bypass switch of the thyristor converter in the combined rectification and converter station;

[0099] (4) Blocking the thyristor converter of the rectification converter station;

[0100] (5) Control the parallel switch and knife switch assembly of the thyristor converter in the rectification converter station to isolate the converter;

[0101] The inverter station performs the following steps:

[0102] (21) Blocking the voltage source converter of the inverter converter station;

[0103...

Embodiment 2

[0106] The control unit specifically performs the following steps when the discrimination unit detects that the hybrid direct current transmission system needs to perform an online exit operation of the converter:

[0107] The rectifier performs the following steps:

[0108] (1) Control the operation of the rectification converter station to increase the trigger angle to 90 degrees or more;

[0109] (2) Control the thyristor bypass pair in the rectifier station;

[0110] (3) The parallel bypass switch of the thyristor converter in the combined rectification and converter station;

[0111] (4) Blocking the thyristor converter of the rectification converter station;

[0112] (5) Control the parallel switch and knife switch assembly of the thyristor converter in the rectification converter station to isolate the converter;

[0113] The inverter station performs the following steps:

[0114] (31) When the DC current is lower than the threshold value, the parallel bypass circui...

Embodiment 3

[0128] The online exit method of the converter includes the following steps. After obtaining the online exit signal of the converter in the hybrid direct current transmission system, the rectifier station performs the following steps:

[0129] (1) Control the operation of the rectification converter station to increase the trigger angle to 90 degrees or more;

[0130] (2) Control the thyristor bypass pair in the rectifier station;

[0131] (3) The parallel bypass switch of the thyristor converter in the combined rectification and converter station;

[0132] (4) Blocking the thyristor converter of the rectification converter station;

[0133] (5) Control the parallel switch and knife switch assembly of the thyristor converter in the rectification converter station to isolate the converter;

[0134] The inverter station performs the following steps:

[0135] (21) Blocking the voltage source converter of the inverter converter station;

[0136] (22) When the DC current is low...

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Abstract

The invention discloses an online switch-off device and method for a hybrid direct-current transmission system converter. The method comprises the following content that a converter online switch-offcommand is initiated by a master control station, a thyristor converter of a rectifier converter station is controlled to increase a trigger angle, a thyristor bypass pair is switched off, a direct-current side parallel bypass switch is switched on, the thyristor converter is locked, and a bypass knife switch assembly is controlled to isolate the converter; and an inverter converter station is controlled to switch on a direct-current side parallel bypass circuit, a voltage source converter is locked, and the bypass knife switch assembly is controlled to isolate the converter. The difficult problem in online switch-off of the hybrid converter can be effectively solved; online safe switch-off of the VSC is realized; and the safety of the direct-current transmission system can be better protected.

Description

technical field [0001] The invention belongs to the field of hybrid direct current transmission, and in particular relates to an online exit device and method for a converter of a hybrid direct current transmission system. Background technique [0002] HVDC systems can be divided into two types: conventional HVDC systems based on thyristor technology (LCC-HVDC) and flexible HVDC systems based on fully controlled voltage source converters (VSC-HVDC). Among them, the conventional direct current transmission system (LCC-HVDC) has the advantages of low cost, low loss, and mature operation technology. The station occupies a large area. The new generation of flexible DC transmission system has the advantages of decoupling control of active power and reactive power, power supply to passive network, compact structure, small footprint, and no commutation failure on the inverter side. There are defects such as high cost and large loss. In recent years, the hybrid DC transmission te...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 赵文强徐斌王永平俞翔黄志岭杨建明卢宇田杰
Owner NR ELECTRIC CO LTD
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