Method and system for protecting double ends of direct-current transmission line with increased opposite-end current break variable

A technology for DC transmission lines and sudden changes, which can be used in the measurement of electrical variables, current/voltage measurement, emergency protection circuit devices, etc., and can solve problems such as poor single-ended electrical quantity protection performance.

Pending Publication Date: 2019-10-15
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

[0004] In order to solve the technical problem of poor protection performance of only relying on single-ended electrical quantity protection in the case of high-resistance faults at the end of the DC transmission line in the prior art, the present invention provides a double-terminal protection of the DC transmission line that boosts the increase in the sudden change of the opposite-end current method, said method comprising:

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  • Method and system for protecting double ends of direct-current transmission line with increased opposite-end current break variable
  • Method and system for protecting double ends of direct-current transmission line with increased opposite-end current break variable
  • Method and system for protecting double ends of direct-current transmission line with increased opposite-end current break variable

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[0059]Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0060] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or overl...

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Abstract

The invention provides a method and a system for protecting double ends of a direct-current transmission line with an increased opposite-end current break variable. The method and the system determinethe current difference value and the current break variable of a line by collecting the current of the direct-current transmission line, start direct-current protection when the current difference value of the line meets a protection starting criterion, determine whether the preset opposite-end current break variable boost criterion is established or not according to the current difference valueof the line and the current break variable, and finally determine whether the direct-current protection action is output or not according to the determination result. The method and the system for protecting the direct-current transmission line with increased opposite-end current break variable can greatly improve the protection action speed of the whole-line metallic fault, the whole-line high-resistance fault, the tail-end high-resistance fault and the metallic fault in the direct-current transmission line region, and can better improve the protection performance of the direct-current transmission line.

Description

technical field [0001] The present invention relates to the field of relay protection of power systems, and more specifically, to a method and system for double-terminal protection of a direct current transmission line that boosts the sudden increase of opposite-terminal current. Background technique [0002] Compared with the traditional AC transmission system, the HVDC transmission system has the advantages of large transmission capacity, long transmission distance, and low loss. It has been widely used in long-distance power transmission, large-area grid interconnection, and underground cable transmission. High-voltage direct current transmission lines shoulder the heavy responsibility of power transmission in energy production areas and load center time periods. The transmission distance is long, the operating conditions are harsh, and the failure rate is higher than other parts of the direct current system, accounting for about 50% of direct current system failures. The...

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Application Information

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IPC IPC(8): H02H7/26G01R19/165
CPCH02H7/268G01R19/16538Y02E60/60
Inventor 曹虹周泽昕柳焕章吕鹏飞杜丁香刘丹王兴国药韬王英英龙崦平李勇
Owner CHINA ELECTRIC POWER RES INST
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