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Alternating current filter switching strategy for preventing commutation failure during unlocking process of alternating current power transmission system

A technology of DC transmission system and AC filter, applied in AC network to reduce harmonics/ripples, electrical components, harmonic reduction devices, etc., can solve problems such as commutation failure, improve accuracy and increase investment costs , the effect of improving operational reliability

Inactive Publication Date: 2016-02-03
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that commutation failure is prone to occur during the unlocking process of the DC transmission system caused by the weak AC system at the receiving end, and provides a filter switching strategy to prevent commutation failure during the unlocking process of the DC project

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  • Alternating current filter switching strategy for preventing commutation failure during unlocking process of alternating current power transmission system

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Embodiment Construction

[0025] The AC filter switching strategy for preventing commutation failure in the unlocking process of the DC transmission system according to the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] like figure 1 As shown, in one embodiment, the specific steps for implementing the AC filter switching strategy of the present invention to prevent commutation failure during the unlocking process of the DC power transmission system are:

[0027] S1. After the unlocking command is issued, first put into the A-type AC filter;

[0028] S2. Detect and calculate the range of reactive power exchanged by the system, determine whether the reactive power exceeds the limit, and if it exceeds the limit, put in a reactor of corresponding capacity;

[0029] S3. On the premise that the reactive power does not exceed the limit, put into the B-type AC filter;

[0030] S4. Detect and calculate the range of reactive po...

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Abstract

The invention relates to an alternating current filter switching strategy for preventing commutation failure during an unlocking process of an alternating current power transmission system. By virtue of the original alternating current filter and electric reactor of the alternating current power transmission system and based on the characteristic that the alternating current filter effectively reduces characteristic subharmonic waves, in the unlocking process of an alternating current engineering, a smallest filter group and the electric reactor are switched on at first and then the unlocking operation is carried out, and thus the commutation failure in the unlocking process can be effectively suppressed, especially for the alternating current engineering of a weak alternating current system at a receiving end.

Description

technical field [0001] The invention relates to the field of electric power, in particular to a filter switching strategy for preventing commutation failure in the unlocking process of a DC project. Background technique [0002] The AC filter is a very important part of the DC transmission system. Its main function is to provide reactive power support for the system and filter out system harmonics at the same time. For direct current transmission systems, [0003] At present, the AC filter switching strategy usually adopted when the DC transmission system is unlocked is: when the DC current I>I 1 When the A-type AC filter is used, when the DC current I>I 2 , put into B-type AC filter (where I 2 > I 1 , usually I 1 = 10A, I 2 =50A). However, there is usually a delay of several seconds between the input of the filter and the action of the actuator, so that when the B-type AC filter is actually switched on, the DC current is much greater than I 2 , when the B-t...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J5/00H02J3/01
CPCY02E40/40
Inventor 辛清明杨煜张祖安李欢
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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