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Method of avoiding multi-circuit DC continuous commutation failure of multi-circuit DC power transmission feed-in system

A DC transmission system, commutation failure technology, applied to electrical components, circuit devices, emergency protection circuit devices, etc., can solve problems such as unstable operation of AC power transmission system, multiple DC continuous commutation failures, etc., to avoid instability running effect

Active Publication Date: 2020-02-25
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +2
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0009] The invention solves the continuous commutation of multiple DC circuits caused by a single AC system failure by establishing the signal interaction between the multi-infeed DC transmission control and protection systems, and setting the value of increasing the cut-off angle according to the commutation failure of other DC systems. The failure problem, to avoid the unstable operation of the AC transmission system caused by the continuous commutation failure of multiple DC circuits

Method used

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  • Method of avoiding multi-circuit DC continuous commutation failure of multi-circuit DC power transmission feed-in system

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Embodiment

[0053] The steps of a specific embodiment of the method for avoiding the failure of multi-circuit DC continuous commutation in the multi-circuit DC transmission feed-in system are as follows:

[0054] There are 4 circuits of DC transmission systems connected in a certain area. The 4 circuits of DC transmission systems are defined as DC A, B, C, and D, and DC A is used as the observed local DC.

[0055] Logic 1: Perform "logic OR" operation on the detected signals of DC B, C, and D phase commutation failures to obtain the output value X. When X is true, DC A increases the other turn-off angle by 8 degrees; when X When False, DC A increases the other back to the off-angle angle of 0 degrees.

[0056] Logic 2: Perform "logic AND" operation on the detected signals of DC B, C, and D phase commutation failures to obtain the output value Y. When Y is true, DC A increases the other turn-off angle by 15 degrees; when Y When False, DC A increases the other back to the off-angle angle o...

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Abstract

The invention discloses a method of avoiding multi-circuit DC continuous commutation failure of a multi-circuit DC power transmission feed-in system, which comprises the following steps of: 1, selecting any one circuit DC power transmission system as a current-circuit DC power transmission system to receive signals detected by commutation failure of other-circuit DC power transmission systems, andconsidering a commutation result of the current-circuit DC power transmission system, and 2, respectively judging the authenticity of the signals detected by the commutation failure of the current-circuit DC power transmission system and other-circuit DC power transmission systems. According to the method, signal interaction between multi-infeed DC power transmission control protection systems isestablished, the numerical value of a turn-off angle is set and increased according to the commutation failure conditions of other-circuit DC systems and the commutation failure conditions of the current-circuit DC system, so that the problem of continuous commutation failure of multi-circuit DC caused by the fault of a single AC system is solved, and unstable operation of an AC large power gridsystem caused by continuous commutation failure of multi-circuit DC is avoided.

Description

technical field [0001] The invention relates to the fields of AC and DC transmission hybrid systems and high-voltage DC transmission control and protection systems, and in particular to a method for avoiding the failure of multi-circuit DC continuous commutation in a multi-circuit DC transmission feed-in system. Background technique [0002] In the past two decades, China's (UHVDC) transmission projects have developed rapidly, and a large power grid system fed by multi-circuit DC transmission has been formed in East China, Guangdong, Shandong and other regions. The electrical power is enormous. (Special) In the single-control device technology of the thyristor converter valve used in the high-voltage direct current transmission project, it is very common that the grounding fault of the AC system causes the commutation failure of the direct current transmission system. In large power grid systems fed by multiple DC transmission circuits, faults such as grounding of a single ...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H1/00
CPCH02H1/0092H02H7/268
Inventor 李宽李玉敦邹强王俊生刘萌张国辉王昕柏传军赵斌超张婉婕杨超刘永刚史方芳王玉龙王永波李娜孙萌萌黄秉青李聪聪梁正堂
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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