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Multi-infeed direct current system commutation failure prediction control and coordination control improvement method

A multi-feed DC, predictive control technology, applied in the direction of power transmission AC network, etc., can solve the problems of increasing the commutation process, the control effect needs to be further improved, and the trigger angle in advance.

Active Publication Date: 2021-07-06
STATE GRID JIANGSU ECONOMIC RES INST +1
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Problems solved by technology

Among them, CFPREV detects the voltage signal after the fault, and outputs the trigger angle in advance to increase the margin of the commutation process to suppress the commutation failure, but it lacks the consideration of the influence of reactive power interaction characteristics between the DC circuits, and the control effect of suppressing successive commutation failures remains to be seen. further improvement

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  • Multi-infeed direct current system commutation failure prediction control and coordination control improvement method
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  • Multi-infeed direct current system commutation failure prediction control and coordination control improvement method

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Embodiment Construction

[0099] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0100] An improved method for commutation failure predictive control coordinated control of a multi-infeed DC system, the improved method comprising the following steps:

[0101] S1: Consider voltage harmonics and DC current changes to predict the arc extinguishing angle of the subsequent commutation process of each DC circuit, mainly including:

[0102] S11: Commutation voltage fitting

[0103] The commutation voltage is fitted based on the general law of the sys...

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Abstract

The invention discloses a multi-infeed direct current system commutation failure prediction control and coordination control improvement method, whichcomprises the following steps: predicting an extinction angle of direct current of each circuit in a subsequent commutation process by considering voltage harmonics and direct current changes; and multiplying the predicted extinction angle by an electrical coupling factor so as to guide the output of commutation failure prediction control. According to the improvement method, by considering the change of alternating voltage and direct current, the extinction angle of each system in the subsequent commutation process is predicted; a coupling coefficient considering the electrical distance between direct currents of all the circuits is proposed, and is multiplied by the margin predicted in the subsequent commutation process of the direct currents of all the circuits so as to obtain the margin evaluation index of the direct currents of all the circuits considering the reactive interaction influence is obtained, so that guidance and adjustment of commutation failure prediction control output are achieved; and the successive commutation failure of the multi-infeed direct current system can be effectively suppressed, and compared with an existing method, the response speed is improved to a certain extent, and meanwhile, the coupling relation between all circuits of direct current is considered.

Description

technical field [0001] The invention relates to the field of safety and stability analysis and control of electric power systems, in particular to an improved method for commutation failure prediction control coordination control of multi-feed direct current systems. Background technique [0002] The HVDC power transmission project based on thyristor commutation has been widely used due to its advantages of large transmission capacity and long distance. However, DC densely feeds into the AC system to form a complex multi-infeed DC system, which poses new challenges to the safe and stable operation of the power system. The electrical distance of the DC landing point in the multi-infeed system is getting closer and closer, and its dynamic reactive power coupling relationship is getting closer and closer. The commutation failure caused by a single-circuit DC fault will lead to successive commutation failures of other DCs. Current commutation failure suppression strategies for ...

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 谢珍建张文嘉黄成辰许偲轩郭莉黄俊辉顾锐郑晨一汤奕
Owner STATE GRID JIANGSU ECONOMIC RES INST
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