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A Coordinated Control Method to Suppress Continuous Commutation Failure

A technology of coordinated control and commutation failure, applied in the direction of irreversible DC power input conversion to AC power output, output power conversion device, AC power input conversion to DC power output, etc., can solve valve group blocking, multi-circuit Simultaneous or successive DC commutation failures, DC system derating operation, etc.

Active Publication Date: 2021-08-20
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, traditional DC transmission uses thyristors without self-shutoff capability as commutation components, and accidents such as AC faults can easily lead to commutation failures.
Commutation failure will cause unfavorable factors affecting system operation such as DC voltage drop and short-term increase of DC current; continuous commutation failure will easily cause derating operation of the DC system, and even cause valve group blocking or pole blocking
With the increase of MIDC scale and the decrease of the electrical distance between DC landing points, when the AC system at the receiving end fails, multiple DC commutation failures may occur simultaneously or successively; when the AC fault is serious, multiple DC commutation failures may occur. The occurrence may lead to the interruption of DC power transmission, which seriously threatens the safe and stable operation of the DC system

Method used

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  • A Coordinated Control Method to Suppress Continuous Commutation Failure
  • A Coordinated Control Method to Suppress Continuous Commutation Failure
  • A Coordinated Control Method to Suppress Continuous Commutation Failure

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Embodiment Construction

[0066] figure 1 It is a general model diagram of an inverter station coordinated control method according to an embodiment of the present invention. The coordinated control method includes: constant DC voltage control, constant DC current control, fixed turn-off angle control, low-voltage current-limiting control, and additional turn-off angle adjustment dynamic control and additional DC current control; the constant DC voltage control, constant DC current control and constant turn-off angle control act together on the dynamic change of the trigger angle of the inverter station in advance to control the stable operation of the entire inverter station; the constant DC voltage control and low voltage current limit control are connected in turn. The initial control configuration of the inverter station includes constant DC voltage control, constant DC current control, constant turn-off angle control and low-voltage current-limiting control. Based on the initial control link, the...

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PUM

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Abstract

The invention discloses a coordinated control method for suppressing continuous commutation failure. When the inverter station is in normal operation, through the initial configuration, that is, constant DC voltage control, constant DC current control, constant turn-off angle control and low-voltage current limiting control. The inverter station performs stability control. At this time, the additional turn-off angle adjustment dynamic control and the additional DC current control do not work, and they have no effect on the normal operation control; when a single-phase ground fault occurs on the AC side of the inverter station, based on the principle of constant minimum turn-off area and The additional shut-off angle adjustment dynamic control specifically affected by the single-phase fault starts to work and dynamically adjusts the set value of the shut-off angle to ensure the shut-off margin of the converter valve. The invention can be widely applied to the control of the traditional direct current transmission system.

Description

technical field [0001] The invention relates to the field of direct current transmission system control, in particular to a coordinated control method for suppressing continuous commutation failure. Background technique [0002] The traditional DC transmission system has a large power transmission capacity, and at the same time takes into account the advantages of low transmission loss, fast and flexible transmission power adjustment or reversal, high transmission reliability, and strong asynchronous contact capability. It is widely used in power transmission and other aspects. At present, my country has become the country with the most direct current transmission lines and the largest transmission capacity in the world. [0003] However, traditional DC transmission uses thyristors without self-shutoff capability as commutation components, and accidents such as AC faults easily lead to commutation failures. Commutation failure will cause unfavorable factors affecting syste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36H02M7/00H02M7/48
CPCH02J3/36H02M7/00H02M7/48Y02E60/60
Inventor 罗安欧素妤周小平杨苓谭文娟姜劲松洪乐荣王霞
Owner HUNAN UNIV
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