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Method and system for multi-stage distance protection of high-voltage direct current line based on single-ended quantity

A high-voltage direct current, distance protection technology, applied in the direction of emergency protection circuit devices, measuring electricity, measuring devices, etc., can solve the problems of low reliability, high sampling rate, lack of clear setting basis for high-voltage direct current lines, etc., to achieve high reliability, The effect of simple criterion and fast action speed

Active Publication Date: 2019-01-15
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

[0003] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method and system for multi-stage distance protection of high-voltage DC lines based on single-ended measurement, thereby solving the lack of clear setting basis, sampling A series of technical problems such as high rate and low reliability

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  • Method and system for multi-stage distance protection of high-voltage direct current line based on single-ended quantity
  • Method and system for multi-stage distance protection of high-voltage direct current line based on single-ended quantity
  • Method and system for multi-stage distance protection of high-voltage direct current line based on single-ended quantity

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[0032] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0033] Aiming at a series of problems existing in the existing high-voltage direct current circuit protection, the present invention proposes a multi-stage distance protection based on single-ended quantities suitable for high-voltage direct current circuits. According to the length of the line to be protected, set the corresponding number of protection sections. This protection can quickly and...

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Abstract

The invention relates to a single-ended-data-based multi-segment distance protection method and system of a high-voltage direct-current line. The method comprises: voltage and current information at relay protection device installation locations of p-pole and n-pole lines of a direct-current transmission system are collected and the collected information is sent to respective signal processing units of all segments of protection units of the two poles of lines to carry out low-pass filter processing with different cutoff frequencies; according to line parameters and measurement signals after filtering of all segments of protection units, compensation voltages of set points of all segments of protection units of the two poles of lines are calculated; and ratios of the compensation voltages of set points of all segments of protection units of the two poles of lines to corresponding filtered measurement voltages of the segments are calculated and internal and external faults in the high-voltage direct-current line zone are determined based on the negative or positive state of the ratios. The criterion is simple; the reliability is high; and the set basis does not rely on simulation; and thus a series of problems that the existing high-voltage direct-current line protection is lack of clear setting basis and the reliability is low are solved.

Description

technical field [0001] The invention belongs to the technical field of electric power system relay protection, and more specifically relates to a method and system for multi-stage distance protection of high-voltage direct current lines based on single-ended measurement. Background technique [0002] In recent years, HVDC transmission projects have developed rapidly in my country. HVDC transmission has the advantages of large transmission capacity, low line loss, and easy access to distributed energy sources. However, since HVDC transmission systems are usually used to transmit electric energy over long distances, they will inevitably face various harsh weather and natural environments. Therefore, its transmission lines are extremely prone to failure. However, the existing HVDC transmission line protection has various deficiencies, such as high sampling rate requirements for traveling wave protection, imprecise theory, susceptible to lightning interference, difficult wave ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26G01R31/08
CPCG01R31/085G01R31/088H02H7/263H02H7/268
Inventor 文明浩秦瑜郑俊超蔡宜君王玉玺
Owner HUAZHONG UNIV OF SCI & TECH
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