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Method and a system for evaluating the adaptability of an AC/DC power network to the restoration of a DC system

A technology of DC system and AC system, which is applied in the direction of power transmission AC network, etc., can solve the problem of adaptability assessment of DC system restoration, cannot directly apply multi-infeed DC system restoration, etc., to ensure technical security, Ensure static voltage stability and fully utilize the effect

Active Publication Date: 2019-01-11
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +2
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Problems solved by technology

Some of the existing literatures only consider the starting conditions of the DC system in the case of black start in the single-infeed DC system, but do not involve the recovery of the multi-infeed system; the generalized short-circuit ratio (GSCR) can be used to give the system voltage static stability. Safety constraints, the multi-infeed DC system voltage interaction can be calculated using the multi-infeed interaction factor (MIIF), but these theories cannot be directly applied to the recovery of multi-infeed DC systems
[0005] From the above analysis, it can be seen that the existing technology does not solve the problem of adaptability assessment of the AC / DC grid to the restoration of the DC system during the restoration process of the multi-infeed DC system

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  • Method and a system for evaluating the adaptability of an AC/DC power network to the restoration of a DC system

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[0062] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0063] It should be noted that the terminology used here is only used to describe specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0064] For the recovery of multi-infeed DC systems, due to the dense location of each converter station, the e...

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Abstract

The invention discloses a method and a system for evaluating the adaptability of an AC / DC power network to the restoration of a DC system, When the DC system starts, the voltage and frequency safety of the AC system are evaluated according to the active power, reactive power, short-circuit capacity of the DC converter bus and the frequency modulation ability of the AC system when the DC system starts. The static voltage stability of multi-infeed DC system is checked by using multi-infeed generalized short-circuit ratio when the DC system power rises to the rated value after the DC system starts up to meet the safety conditions. The static voltage stability of multi-infeed DC system is checked by using multi-feed generalized short-circuit ratio. After the static voltage stability of multi-feed HVDC system is restored, the risk of commutation failure in the restored HVDC system is evaluated by using the relationship between electrical parameters and mutual impedance. The invention ensures the technical safety of the multi-infeed DC system in restoring the early start-up DC system, and can make full use of the DC regulating ability and accelerate the process of system restoration.

Description

technical field [0001] The present disclosure relates to the technical field of power system automation, in particular to a method and system for evaluating the adaptability of an AC / DC power grid to DC system recovery. Background technique [0002] When the receiving ends of the multi-circuit DC transmission line are relatively concentrated and the electrical distance is relatively short, these DC systems and the receiving end AC grid form a multi-infeed DC system (MIDC). Due to the dense location of the converter stations, the electrical coupling between the inverter stations is strong, and the interaction mechanism becomes more complicated. At present, there is very little experience in recovery operations after a large-scale blackout in multi-feeder DC transmission systems at home and abroad. The recovery of major power grids in response to large-scale blackouts is to restore the AC first, and finally restore the DC strategy. [0003] The DC transmission system has the ...

Claims

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Application Information

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IPC IPC(8): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 王洪涛杨善栋刘玉田杨冬马欢赵康
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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