A hybrid DC transmission line traveling wave protection method and system based on dual tree complex wavelet transform

A technology of hybrid DC and transmission lines, which is used in emergency protection circuit devices, electrical components, etc.

Active Publication Date: 2018-12-18
CHINA ELECTRIC POWER RES INST +1
View PDF9 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A hybrid DC transmission line traveling wave protection method and system based on dual tree complex wavelet transform
  • A hybrid DC transmission line traveling wave protection method and system based on dual tree complex wavelet transform

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0059] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for the purpose of this thorough and complete disclosure 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 are not intended to limit the invention. In the drawings, the same elements / elements are given the same reference numerals.

[0060] Unless otherwise defined, terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is to be understood that terms defined in commonly used dictionaries should be construed as having meanings consistent with the context in the related art, and should not be construed as idealized or overly formal...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a hybrid DC transmission line traveling wave protection method and system based on dual tree complex wavelet transform, and the method comprises the following steps: calculating voltage difference modulus and voltage common modulus according to DC voltage of positive and negative electrodes collected; The dual-tree complex wavelet transform is used to calculate the voltagedifference modulus, and the protection is judged whether to start or not according to the high sensitivity start-up. When the protection is started, the fault type is judged and the corresponding protection action is carried out according to the dual tree complex wavelet transform of voltage common modulus and voltage difference modulus and the corresponding fault extremum by using the fault judgment basis of the hybrid DC transmission line. The invention can quickly distinguish the faults of the hybrid HVDC transmission line, can reliably carry out fault pole selection, greatly reduces the translation sensitivity in the common real wavelet transform, can remarkably improve the accuracy of fault analysis in the long-distance transmission line, and realizes the fast identification of the faults of the hybrid DC transmission line.

Description

technical field [0001] The present invention relates to the technical field of relay protection in electrical technology, and more particularly, to a method and system for traveling wave protection of hybrid direct current transmission lines based on dual tree complex wavelet change. Background technique [0002] Line Commutated Converter (LCC-HVDC) system 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 direct current transmission system (Voltage SourceConverter, VSC-HVDC) based on the voltage source converter has the advantages of independent control of active power and reactive power, can work in passive systems, and is not affected by commutation failure. However, it has the disadvantages of high cost and large operating loss. Hybrid DC transmission system (LCC-VSC) is a new type of DC t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap