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

AC Fault Protection Method Using MMC Injection Signal Characteristics

A fault protection and signal injection technology, which is applied in the direction of automatically disconnected emergency protection devices, emergency protection circuit devices, electrical components, etc., can solve the problem of fast decay of electromagnetic energy in the line, improve the recombination efficiency, and realize self-adaptive discrimination , to achieve the effect of rapid recovery

Active Publication Date: 2019-12-24
XIAN XIRUI CONTROL TECH CO LTD
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When there is no shunt reactor on the line, after the three-phase fault circuit breaker trips, the electromagnetic energy of the line attenuates quickly, and there is no feasible method for identifying the nature of the fault for three-phase reclosing.

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
  • AC Fault Protection Method Using MMC Injection Signal Characteristics
  • AC Fault Protection Method Using MMC Injection Signal Characteristics
  • AC Fault Protection Method Using MMC Injection Signal Characteristics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] In the following, an AC fault protection method using MMC injection signal characteristics of the present invention will be further described with reference to the accompanying drawings:

[0030] The AC fault protection method using MMC injection signal characteristics proposed by the present invention realizes adaptive reclosing in the AC system of overhead line transmission occasions, realizing adaptive discrimination of fault nature and reclosing time, helping to improve the recombination power, and realizing The rapid recovery of system power transmission is achieved.

[0031] The present invention provides an AC fault protection method using MMC injection signal characteristics, including:

[0032] Establish in PSCAD software such as figure 1 The MMC shown, build a flexible AC / DC transmission system on this basis, such as figure 2 As shown, when the AC multi-circuit transmission line fails or the AC single-circuit transmission line has an asymmetrical fault, the AC circ...

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 an AC fault protection method using MMC injection signal characteristics. The method comprises the following steps: after an AC line fault occurs in a flexible AC-DC hybrid power grid, AC circuit breakers at both ends of the fault line are tripped; within the interval of fault isolation and reclosing, the amplitude of the modulation wave of an MMC is controlled, so that theAC voltage of the MMC temporarily drops, the voltage disturbance of normal lines is coupled in the AC fault line, and a characteristic signal is sensed by the AC fault line. The propagation characteristic of the characteristic signal differs when the AC line fault exists and disappears. The difference is used to determine the fault nature of the AC fault line, and then determine whether the circuit breakers in the faulty transmission line should be reclosed to achieve AC line fault protection. The AC fault protection method of the invention has important significance for the improvement of the reliability of power supply and the safe and stable operation of the AC overhead transmission line.

Description

Technical field [0001] The invention belongs to the field of AC line fault protection, and particularly relates to an AC fault protection method using MMC injection signal characteristics. Background technique [0002] The majority of power system faults are transmission line faults. The higher the voltage level, the greater the probability of single-phase faults. Transmission line faults are mostly instantaneous. After the line fails, the circuit breakers on both sides are opened, and the power supply can be restored after the arc is extinguished and the insulation is restored. Therefore, automatic reclosing is widely used in EHV / UHV AC systems. However, if the recloser is a permanent fault, the power system will suffer two consecutive fault impacts in a short period of time, reducing the insulation of electrical equipment and reducing its service life. Therefore, research on adaptive reclosing that can identify the nature of the fault has certain prospects. [0003] In the AC sy...

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
IPC IPC(8): H02H7/26H02H3/06
CPCH02H3/066H02H7/262H02H7/263
Inventor 宋国兵王婷张晨浩吴磊
Owner XIAN XIRUI CONTROL TECH CO LTD
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