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

High-voltage direct-current transmission line lightning stroke interference identification method based on current attenuation ratio

A high-voltage DC, interference identification technology, applied in emergency protection circuit devices, measuring electricity, electrical components and other directions, can solve the problems of inapplicability of classification standard power system, difficult ultra-high-speed transient protection, modal aliasing, etc. Satisfy the protection swiftness, avoid the effects of long time window and low calculation speed

Pending Publication Date: 2021-05-28
XUCHANG XJ SOFTWARE TECH +1
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the extraction of waveform features in the time domain needs to be based on a long time window, which is difficult to cooperate with ultra-high-speed transient protection
In the frequency domain, methods such as wavelet transform and HHT are usually used, which can effectively extract the difference in energy distribution of interference and fault spectrum. However, the selection of wavelet base and the determination of parameters in the former have strong experience, while the latter has unavoidable modal aliasing. Phenomenon
The artificial intelligence method avoids complex mathematical operations, and the purpose of distinguishing interference and faults can be achieved through offline learning of the training set, but there are few actual examples that can be used as the training set, and it needs to be based on a large number of simulation results. May not be applicable in actual power system

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
  • High-voltage direct-current transmission line lightning stroke interference identification method based on current attenuation ratio
  • High-voltage direct-current transmission line lightning stroke interference identification method based on current attenuation ratio
  • High-voltage direct-current transmission line lightning stroke interference identification method based on current attenuation ratio

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0030] figure 1 It is a ±500kV hybrid HVDC power transmission system using LCC at the sending end and MMC at the receiving end. Among them, the LCC side converter station uses a twelve-pulse converter, and the inverter side uses a 301-level modular multi-level converter, which is a true bipolar structure. This model adopts various parameters of a ±500kV DC transmission project with a rated power of 3000MW and a total length of 1000km.

[0031] When the high-voltage direct current transmission line is 200km away from the rectifying side protection installation place and the lightning strikes the top of the tower, the method provided by the invention can eliminate the lightning strike interference. Assume that the lightning current waveform is 1.2 / 50μs, the amplitude is -50kA, and the line is not faulty. The identification scheme includes the...

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 high-voltage direct-current transmission line lightning stroke interference identification method based on a current attenuation ratio, and the method comprises the steps: carrying out the phase-mode transformation of a rectification side positive and negative current signal fault component in a data window T with a certain length (usually 0.8-1ms), and obtaining a line-mode current fault component; secondly, solving a maximum value of an absolute value of a line mode current fault component, an absolute value integral of the line mode current fault component and a nominal average value of the line mode current fault component in sequence; and finally, calculating a line mode current fault component attenuation ratio, comparing the line mode current fault component attenuation ratio with a threshold value, and judging lightning stroke interference or faults. The lightning stroke interference can be accurately identified, and the reliability of the ultrahigh-speed transient state quantity protection of the direct-current line is improved.

Description

technical field [0001] The invention belongs to the field of power systems, relates to the field of relay protection of high-voltage direct current transmission lines, and in particular relates to a method for identifying lightning strike interference of high-voltage direct current transmission lines based on the current attenuation ratio. Background technique [0002] With the depletion of fossil energy and the prominence of global climate and environmental issues, clean energy is gradually playing an important role in the global energy structure. As an effective way to solve the problem of clean energy transmission, in addition to the advantages of low line cost, simple structure, large transmission capacity, small loss, and long transmission distance, HVDC transmission has the advantages of long-distance transmission of electric energy, asynchronous networking of power systems, distributed It is also widely used in resource grid connection and urban cable power supply. 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): H02H7/26G01R31/08
CPCH02H7/268G01R31/085G01R31/088
Inventor 倪传坤戴国安李传西李卓凡付艳叶冬萌谢凡郝治国
Owner XUCHANG XJ SOFTWARE TECH
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