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Ratio braking pole selection method and system for direct current transmission line

A DC transmission line, ratio braking technology, applied in circuit devices, emergency protection circuit devices, electrical components, etc., can solve the problems of lack of high reliability and easy malfunction of non-fault pole line protection

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

[0004] In order to solve the technical problem in the prior art that the protection of non-faulty poles in DC transmission lines is prone to misoperation due to the lack of highly reliable pole selection methods, the present invention provides a DC transmission line ratio braking pole selection method. The methods described include:

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  • Ratio braking pole selection method and system for direct current transmission line
  • Ratio braking pole selection method and system for direct current transmission line
  • Ratio braking pole selection method and system for direct current transmission line

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Embodiment Construction

[0063] 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.

[0064] 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 over...

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Abstract

The invention provides a ratio braking pole selection method and system for a direct current transmission line. The method and the system determine the current difference value and the current break variable of the line by collecting a current of a direct-current transmission line, start direct-current protection when the current difference value of the line meets a protection starting criterion,determine whether a pole selection criterion of a ratio braking current is established or not according to the current break variable, and finally determine whether the started direct-current protection is output or not according to the determination result. According to the ratio braking pole selection method and system, when a certain direct-current transmission line has a metallic or high-resistance fault, the pole selection criterion of the ratio braking current of the fault pole is established, the line protection acts, the ratio braking current pole selection criterion of the non-fault pole is not established, the line protection of the non-fault pole does not act, the problem that the line protection of the non-fault pole acts mistakenly when the direct-current transmission line hasthe fault is solved well, and the protection performance of the direct-current transmission line is improved.

Description

technical field [0001] The present invention relates to the field of relay protection of electric power systems, and more specifically, to a DC transmission line ratio brake pole selection method and system. 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. Therefore, high-performance HVDC transmission line protection is of great si...

Claims

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Application Information

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IPC IPC(8): H02H7/26H02H3/00
CPCH02H7/268H02H3/006
Inventor 吕鹏飞柳焕章周泽昕阮思烨曹虹杨国生王兴国杜丁香李勇龙崦平
Owner CHINA ELECTRIC POWER RES INST
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