Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A traveling wave protection method, lightning strike interference judgment method and device for flexible straight system

A technology of traveling wave protection and power transmission system, which is applied in the direction of emergency protection circuit devices, fault locations, power transmission AC networks, etc. It can solve the problems of low fault judgment efficiency, improve judgment efficiency, reduce calculation amount, and reduce power grid outage losses Effect

Active Publication Date: 2020-07-17
XJ ELECTRIC +2
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a traveling wave protection method for a flexible direct current system, a method and a device for judging lightning strike interference, which are used to solve the problem of low efficiency in fault judgment of a flexible direct current transmission system in the prior art

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 traveling wave protection method, lightning strike interference judgment method and device for flexible straight system
  • A traveling wave protection method, lightning strike interference judgment method and device for flexible straight system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] The specific embodiment of the present invention will be further described below in conjunction with accompanying drawing:

[0026] Embodiment of traveling wave protection method for flexible direct current transmission system

[0027] The invention provides a traveling wave protection method for a flexible direct current transmission system. Firstly, by collecting the voltage signal and current signal of the flexible direct current transmission system, the voltage signal is subjected to S transformation to obtain a two-dimensional complex time-frequency matrix; then according to the two-dimensional complex time The frequency matrix extracts the amplitude of each sampling point in the set frequency range, and judges the change trend of the amplitude of the sample points in the set frequency range. If the change trend of the amplitude meets the set conditions, it is judged that the flexible direct current transmission system line has a lightning strike Interference, if t...

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 provides a travelling wave protection method and a lightning stroke interference determining method and device of a flexible DC system. Voltage signal of the flexible DC transmission system are collected, and S transformation is carried out on the voltage signals to obtain a 2D multi-time-frequency matrix; and amplitudes of sampling points in the set frequency band are extracted fromthe 2D multi-time-frequency matrix, the change trend of the amplitudes of the sampling points in the set frequency band is determined, if the amplitude change trend satisfies a set condition, it is determined that a lightning stroke interference occurs in a line of the flexible DC transmission system, and otherwise, it is determined that a fault occurs in the flexible DC transmission system, anda travelling wave protection motion is made. According to the methods and device, the computational complexity is low, less time is consumed, a computing process is simple, the travelling wave fault determining efficiency of the DC transmission system is improved, faults can be removed rapidly, equipment damage caused by fault of the power line can be reduced greatly, impact on the AC grid is reduced, power failure loss of the power grid is reduced, severe power failure accidents due to instability of the primary power grid can be prevented, and the reliability of the DC power grid is improved.

Description

technical field [0001] The invention belongs to the technical field of DC transmission relay protection, and in particular relates to a traveling wave protection method for a flexible DC system, a lightning strike interference judgment method and a device. Background technique [0002] With the development of power electronics technology, the flexible DC transmission system has continuously obtained new breakthroughs on this basis. Flexible DC transmission technology is considered to be the development direction of future power transmission. Compared with AC transmission systems, DC systems have high stability and low transmission loss. Especially with the development of high-voltage and large-capacity power devices and the realization of high-voltage DC circuit breakers, DC The grid already has the technical basis to replace the AC grid. Since there is no commutation failure problem in flexible DC transmission, and the voltage harmonic content is small, the output frequency...

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 Patents(China)
IPC IPC(8): H02H7/26G01R31/08H02J3/36
CPCG01R31/086H02H7/265H02H7/268H02J3/36Y02E60/60
Inventor 李传西黄金海戴国安田培涛吴庆范付艳范子强许朋见霍城辉车强飞陈传奇
Owner XJ ELECTRIC
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com