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A hybrid direct current transmission system converter online withdrawal device and method

A power transmission system and hybrid DC technology, applied in power transmission and AC networks, etc., can solve problems such as lack of versatility, and achieve the effect of protecting safety and reducing the impact of AC and DC currents.

Active Publication Date: 2022-01-14
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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  • A hybrid direct current transmission system converter online withdrawal device and method
  • A hybrid direct current transmission system converter online withdrawal device and method
  • A hybrid direct current transmission system converter online withdrawal device and method

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 exit device and method for a converter in a hybrid direct current transmission system, which includes the following content: the online exit command of the converter is initiated by the main control station, and the thyristor converter of the rectification converter station is controlled to increase the trigger angle, and the switching Thyristor bypass pair, combined with the DC side parallel bypass switch, blocking the thyristor converter, controlling the bypass knife switch component to isolate the converter; controlling the inverter converter station combined with the DC side parallel bypass circuit, blocking the voltage source converter , to control the bypass knife switch assembly to isolate the converter. The invention can effectively solve the problem of online withdrawal of the hybrid converter, realize the safe online withdrawal of the VSC converter, and better protect the safety of the AC / DC power transmission system.

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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Patent Type & Authority Patents(China)
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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