A method and system for traveling wave protection of hybrid direct current transmission line based on dual tree complex wavelet variation

A technology of hybrid DC and power transmission lines, applied in emergency protection circuit devices, electrical components, etc., to reduce translation sensitivity, improve accuracy, and solve the effect of insufficient sensitivity

Active Publication Date: 2022-01-07
CHINA ELECTRIC POWER RES INST +1
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Problems solved by technology

[0004] The present invention proposes a hybrid DC transmission line traveling wave protection method and system based on dual tree complex wavelet changes to solve the problem of how to quickly determine the fault of a hybrid DC transmission line

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  • A method and system for traveling wave protection of hybrid direct current transmission line based on dual tree complex wavelet variation
  • A method and system for traveling wave protection of hybrid direct current transmission line based on dual tree complex wavelet variation

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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 over...

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Abstract

The invention discloses a hybrid direct current transmission line traveling wave protection method and system based on dual tree complex wavelet changes, including: calculating the voltage difference modulus and voltage common modulus according to the collected positive and negative DC voltages; The wavelet transform calculates the dual tree complex wavelet transform of the voltage difference modulus, and judges whether the protection is started according to the high-sensitivity start judgment basis; when the protection is determined to start, according to the dual tree complex wavelet transform and the corresponding The fault extreme value of the hybrid DC transmission line is used to judge the fault type and carry out corresponding protection actions. The invention can quickly distinguish the faults of the hybrid direct current transmission line, and can reliably select fault poles, greatly reduces the translation sensitivity in the usual real wavelet transform, and can significantly improve the accuracy of fault analysis in long-distance transmission lines , to realize the rapid identification of hybrid DC transmission line faults.

Description

technical field [0001] The present invention relates to the technical field of relay protection of electrical technology, and more specifically, relates to a hybrid direct current transmission line traveling wave protection method and system based on dual tree complex wavelet variation. Background technique [0002] The line commutated converter type HVDC transmission system (Line Commutated Converter, LCC-HVDC) based on thyristor technology has been widely used in long-distance large-capacity power transmission, asynchronous networking and other occasions, but it has the problem of commutation failure on the inverter side . The high-voltage DC transmission system (Voltage Source Converter, VSC-HVDC) based on the voltage source converter has been rapidly developed due to its independent control of active power and reactive power, the ability to work in passive systems, and not being affected by commutation failures. Development, but it has the disadvantages of high cost and...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/26
CPCH02H7/262
Inventor 陈争光王兴国杜丁香李岩军周泽昕王德林吕鹏飞刘宇刘丹郭雅蓉曹虹程琪
Owner CHINA ELECTRIC POWER RES INST
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