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An adaptive reclosing method and system for transmission lines based on multi-source information

A transmission line, multi-source information technology, applied in the direction of circuit devices, emergency protection circuit devices, electrical components, etc., can solve the problems of DC blocking, DC system impact, etc., to improve stable operation capabilities and reduce DC side commutation failures problem effect

Active Publication Date: 2022-07-26
STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the AC side line coincides with a permanent fault, the impact on the DC system is relatively large, and in severe cases, it may cause DC blocking

Method used

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  • An adaptive reclosing method and system for transmission lines based on multi-source information
  • An adaptive reclosing method and system for transmission lines based on multi-source information
  • An adaptive reclosing method and system for transmission lines based on multi-source information

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Embodiment Construction

[0029] In order to make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described in this application are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the spirit of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0030] The multi-source information interactive communication system proposed by the present invention is as follows: figure 1 shown.

[0031] The specific processing software flow provided by the present invention is as follows: figure 2 shown.

[0032] An adaptive reclosing method for transmission lines based on multi-source information, the m...

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Abstract

An adaptive reclosing method and system for transmission lines based on multi-source information. When a single-phase AC side protection device trips, the active power variation is calculated for the received sound phase voltage and current on the converter station side. When the phase-to-phase active power meets the predetermined conditions, the power fluctuation start flag is set; after the AC side protection device judges that the power fluctuation starts, it adjusts the line closing sequence, and the reclosing strategy is adjusted to be fixed by the remote end of the converter station and put into adaptive reclosing. The gate transient fault residual voltage criterion, the AC side protection device judges the commutation failure information received from the opposite side after the power fluctuation is activated. By comprehensively judging the commutation failure information of the DC system and the AC side fault information, the invention can reduce the problem of DC side commutation failure caused by the permanent fault of the AC side of the receiving end grid, and improve the stable operation capability of the system.

Description

technical field [0001] The invention belongs to the technical field of power system relay protection, and relates to an adaptive reclosing method and system for transmission lines based on multi-source information. Background technique [0002] With the wide application of UHV AC and DC transmission technology, our country has entered the era of UHV AC / DC hybrid grid. When the AC side of the receiving end grid fails, it is easy to cause DC commutation failure, especially the coincidence of permanent faults. After that, it is more likely to cause multiple commutation failures of the DC system, which brings risks to the safe and stable operation of the power grid. Before the present invention, there is no information exchange interface between the DC control protection and the AC system protection of the converter station. When the AC side line coincides with a permanent fault, the impact on the DC system is relatively large, and it can lead to DC blocking in severe cases. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/06H02H7/26
CPCH02H3/066H02H7/268
Inventor 张太升李旭李文正贾云飞段文岩韩伟陈楷杜兴伟王中玉李宝伟
Owner STATE GRID HENAN ELECTRIC POWER ELECTRIC POWER SCI RES INST