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Control optimization method and device for suppressing high-voltage direct current transmission commutation failure

A high-voltage DC transmission and commutation failure technology, which is applied in the field of power transmission and distribution, can solve the problems that the trigger angle control output does not meet the commutation requirements and the high risk of commutation failure, so as to improve the system fault recovery ability and reduce commutation failure Probability of Occurrence Effect

Active Publication Date: 2017-06-23
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a control optimization method and device for suppressing HVDC commutation failure, which solves the problem in the prior art that the trigger angle control output does not meet the commutation requirements and commutation fails when the traditional HVDC AC system fails higher risk issues

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  • Control optimization method and device for suppressing high-voltage direct current transmission commutation failure
  • Control optimization method and device for suppressing high-voltage direct current transmission commutation failure
  • Control optimization method and device for suppressing high-voltage direct current transmission commutation failure

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Embodiment 1

[0043] Embodiment 1. The embodiment of the present invention provides a control optimization method for suppressing HVDC commutation failure, such as figure 1 Shown include:

[0044] S101. Detect whether an AC fault occurs in the inverter station.

[0045] S102. Correcting the triggering angle of the rectifying station and changing the triggering time of the thyristors of the rectifying station when an AC fault occurs in the inverter station is detected.

[0046] Obtain the commutation voltage zero-crossing offset and commutation voltage amplitude change of the inverter station, calculate the cut-off angle adjustment value of the inverter station according to the commutation voltage and the commutation voltage zero-crossing offset, and adjust the inverter station The setting value of the fixed turn-off angle.

[0047] It should be noted that in actual applications, the cut-off angle setting value is calculated as an output, which is superimposed on the setting value of the i...

Embodiment 2

[0049] Embodiment 2. The embodiment of the present invention provides a control optimization method for suppressing HVDC commutation failure, such as figure 2 Shown include:

[0050] S1010. Detect whether an AC fault occurs in the inverter station.

[0051] It should be noted that in actual applications, the method used to judge whether an AC fault occurs in the inverter station is the voltage sine and cosine component detection method; wherein, when there is no AC fault in the inverter station, the rectifier station operates according to preset parameters, and the inverter station operates according to the preset parameters. The substation always adjusts the setting value of the fixed off angle.

[0052] Preferably, in S102, when an AC fault occurs in the inverter station, correct the trigger angle of the rectifier station, and change the trigger time of the thyristors in the rectifier station; obtain the commutation voltage zero-crossing point offset and commutation The v...

Embodiment 3

[0073] Embodiment 3. The embodiment of the present invention provides a control optimization device 10 for suppressing commutation failure of HVDC transmission, such as Figure 5 Shown include:

[0074] The fault detection unit 101 is configured to detect whether an AC fault occurs in the inverter station.

[0075] The control unit 102 is configured to correct the trigger angle of the rectifier station and change the trigger time of the thyristors of the rectifier station when the fault detection unit 101 detects that an AC fault occurs in the inverter station.

[0076] The data acquiring unit 103 acquires the commutation voltage zero-crossing offset and the commutation voltage of the inverter station.

[0077] The processing unit 104 is used to calculate the cut-off angle adjustment value of the inverter station according to the commutation voltage obtained by the data acquisition unit 103 and the offset of the zero-crossing point of the commutation voltage, and adjust the s...

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Abstract

The invention provides a control optimization method and device for suppressing high-voltage direct current transmission commutation failure and belongs to the power transmission and distribution technical field. With the method and device adopted, the problem of high risk of commutation failure caused by a condition that triggering angle control output dose not satisfy a commutation requirement when a high-voltage direct-current transmission alternating-current system malfunctions in the prior art can be solved. The method includes the following steps that: whether an alternating-current fault occurs on an inverter station is detected; when it is detected that an alternating-current fault occurs on the inverter station, the triggering angle of a rectifier station is corrected, so that the triggering time of the thyristor of the rectifier station can be changed; the commutation voltage zero-crossing offset quantity and commutation voltage amplitude change quantity of the inverter station are obtained; and the turn-off angle adjustment value of the inverter station is calculated according to commutation voltage and the commutation voltage zero-crossing offset quantity, and the setting value of the fixed turn-off angle of the inverter station is adjusted. The control optimization method and device provided by the embodiments of the present invention are applied to optimizing the commutation process of high-voltage direct current transmission.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution, in particular to a control optimization method and device for suppressing commutation failure of high-voltage direct current transmission. Background technique [0002] Traditional high-voltage direct current transmission (full name in English: Line Commutated Converter High Voltage Direct Current, abbreviated as: LCC-HVDC), with its unique advantages in technology and economy, plays an important role in my country's electric power industry in terms of long-distance, large-capacity power transmission and national networking. development plays a very important role. However, LCC-HVDC uses ordinary thyristors without self-shutoff capability as commutation components, and requires a certain strength of AC system to provide commutation voltage. A commutation failure occurs, which causes a large loss of DC power. With the massive construction of DC transmission projects, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 李春华李明黄莹饶宏曹润彬郭铸黄伟煌刘涛陈怡静李婧靓童宁
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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