High-voltage DC constant reactive power AC fault recovery method and device

A technology of constant reactive power and fault recovery, applied in the direction of emergency treatment AC circuit layout, power transmission AC network, etc., can solve the problem of high probability of commutation failure, reduce the probability of commutation failure, improve voltage stability and, The effect of improving failover performance

Active Publication Date: 2019-08-27
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Based on this, it is necessary to provide a high-voltage DC constant reactive power AC fault recovery method and device for the high probability of commutation failure during the AC fault recovery process.

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  • High-voltage DC constant reactive power AC fault recovery method and device
  • High-voltage DC constant reactive power AC fault recovery method and device
  • High-voltage DC constant reactive power AC fault recovery method and device

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Embodiment Construction

[0025] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings. The preferred embodiment of the invention is shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more related listed items....

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Abstract

The invention relates to a high-voltage DC constant reactive power AC fault recovery method and device. The high-voltage DC constant reactive power AC fault recovery method comprises the steps of differencing the reactive power consumed by a converter and the reactive power provided by a reactive power compensation device of a converter station according to converter bus voltage and direct current to obtain an exchange reactive power allowance range of an AC system and the converter station, selecting an exchange reactive power expected value from the exchange reactive power allowance range, and generating a direct current instruction value; and performing AC fault recovery on the converter station based on the direct current instruction value. In the AC fault recovery process, the exchange reactive power of the AC system and the converter station can be quantitatively controlled at the expected value, thereby improving the fault recovery performance of the system, and reducing the probability of commutation failure during the AC fault recovery process; and the high-voltage DC constant reactive power AC fault recovery method improves the voltage stability of a multi-infeed direct current system and the fault recovery performance of the system, and has importance significance for improving the stability of a direct current transmission system.

Description

Technical field [0001] The invention relates to the technical field of high-voltage direct current, in particular to a high-voltage direct current constant reactive power AC fault recovery method and device. Background technique [0002] HVDC has been widely used in long-distance high-power transmission and non-synchronous grid interconnection occasions. There are more than 30 DC transmission lines in operation and under construction in my country. my country's power grid has become the world's most complex AC / DC hybrid operation grid. The converters at both ends of the DC system consume a large amount of reactive power during operation. In general, the reactive power consumed by the rectifier and inverter is about 30%-50% and 40%-60% of the transmitted active power, respectively. When the AC system fails, the DC voltage and the converter bus voltage near the converter station will drop rapidly. If the DC system is still working at rated power or rated current, the reactive power...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/36
CPCH02J3/001H02J3/36Y02E60/60
Inventor 傅闯汪娟娟黄梦华李瑶佳李子林王子民龚英明黄星海
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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