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Method and device for preventing from DC blocking

A DC blocking and DC system technology, applied in power transmission and AC networks, etc., can solve problems such as failure to avoid DC blocking logic, multi-DC feeding into the receiving end power grid frequency drop, load loss, etc., to avoid the occurrence of logic criteria. , Reduce the number of DC continuous commutation failures, and suppress the effect of DC blocking

Active Publication Date: 2019-04-19
CHINA ELECTRIC POWER RES INST +3
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Problems solved by technology

In view of the logic action of DC blocking caused by DC continuous commutation failure, the frequency of multiple DC feed-in receiving end grids drops or even falls below the threshold of the action of the three lines of defense, resulting in serious load loss;
[0004] At present, there is no relevant research on avoiding DC blocking logic startup, therefore, a related method or device for avoiding DC blocking logic startup is urgently needed

Method used

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  • Method and device for preventing from DC blocking
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  • Method and device for preventing from DC blocking

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Embodiment Construction

[0040] The specific implementation manners of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0041] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0042] At this stage, due to the influence of heavy loads of power lines and large-scale DC feed-in, etc., the static voltage support capacity of the power grid in UHV DC drop-off areas is insu...

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Abstract

The invention relates to a method and a device for preventing from DC blocking. The method comprises the steps of: acquiring a pre-established fault set; and controlling a DC power transmission systemto perform a DC fallback according to the fault set, wherein the fault set is established by employing the number of times of commutation failure of all the DC transmission system accessed in an AC grid after faults are generated. Through adoption of a fallback DC power mode, the drop amplitude of the voltage is reduced when faults are generated, the voltage recovery feature is improved, the number of times of DC continuous commutation failure is reduced, and DC blocking caused by DC continuous commutation failure is avoided.

Description

technical field [0001] The invention relates to the field of power system planning and operation, in particular to a method and device for preventing DC blocking. Background technique [0002] HVDC transmission is a technology that uses power electronics technology to realize power transmission. With the continuous growth of DC scale, the probability of DC continuous commutation failure increases. [0003] The "National Research Center's Notice on Printing and Distributing the Minutes of the UHV DC Commutation Failure Protection Acceleration Section and Grounding Pole Unbalance Protection Logic Adjustment Seminar" stipulates that the three major DCs in operation in East China are allowed to fail consecutive commutations according to the arranged power. For the specified number of times, the protection logic of continuous commutation failure blocking is started, and the DC is blocked. In view of the logic action of DC blocking caused by DC continuous commutation failure, the...

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 张玉红姜懿郎郭小江宋墩文庄侃沁缪源诚陈浩毕振覃琴韩家辉贺海磊张一驰高超张彦涛秦晓辉周勤勇
Owner CHINA ELECTRIC POWER RES INST
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