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

Current transient quantity principal component cluster analysis direction protection method for power transmission line with static synchronous series compensator

A series compensation, static synchronization technology, applied in the fault location and other directions, can solve the problem of difficult identification of line faults with static synchronization series compensator equipment, and achieve the effect of high reliability and reliable identification

Active Publication Date: 2014-04-30
KUNMING UNIV OF SCI & TECH
View PDF4 Cites 13 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a protection method for current transient principal component cluster analysis direction protection of transmission lines with static synchronous series compensators to solve the problem of difficult identification of line faults with static synchronous series compensators

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
  • Current transient quantity principal component cluster analysis direction protection method for power transmission line with static synchronous series compensator
  • Current transient quantity principal component cluster analysis direction protection method for power transmission line with static synchronous series compensator
  • Current transient quantity principal component cluster analysis direction protection method for power transmission line with static synchronous series compensator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: A current transient principal component clustering analysis direction protection method for a transmission line with a static synchronous series compensator. Principal component analysis is performed on the line-mode current data containing the fault phase in the time window. According to the sample data in the first principal component (PC 1 ) projection on the axis q 1 To distinguish the forward fault from the reverse fault: first estimate the fault initial angle, when the fault initial angle is between 0° and 90°, if the projected value q 1 The sign of is positive, it is judged as a positive fault, if the projection value q 1 If the sign of is negative, it is judged as a reverse fault; when the initial fault angle is between -90° and 0°, if the projection value q 1 The sign of is negative, it is judged as a positive fault, if the projection value q 1 If the sign of is positive, it is judged as a reverse fault.

[0034] The specific steps of the...

Embodiment 2

[0047] Example 2: 500kV line with static synchronous series compensator such as figure 1 shown. The line parameters are as follows: the total length of the line is 150km for the PM section, 150km for the MN section, and 220km for the NQ end. Fault location: A single-phase ground fault occurs 63km away from the M terminal on the MN section. The grounding impedance is 0Ω, the fault time is 0.474s, the initial fault angle is -90°, and the sampling rate is 20kHz.

[0048] (1) According to step 1 to step 3 in the manual, construct the principal component clustering analysis space with different initial fault angles, and obtain the principal component clustering formed by clustering the fault current sample data with initial fault angles of 90° and -90° respectively at the M terminal Analysis space such as 3, Figure 5 shown;

[0049] (2) Put the fault sample into the principal component clustering space that responds to the initial fault angle according to step 4 in the specifi...

Embodiment 3

[0051] Example 3: 500kV line with static synchronous series compensator such as figure 1 shown. The line parameters are as follows: the total length of the line is 150km for the PM section, 150km for the MN section, and 220km for the NQ end. The grounding impedance is 10Ω, the fault time is 0.4715s, the initial fault angle is -30°, and the data sampling rate is 20kHz. A single-phase ground fault occurs at a distance of 97km from the M terminal on the MN section.

[0052] (1) According to step 1 to step 3 in the manual, construct the principal component clustering analysis space with different initial fault angles, and obtain the principal component clustering formed by clustering the fault current sample data with initial fault angles of 90° and -90° respectively at the M terminal Analysis space such as 3, Figure 5 shown;

[0053] (2) Put the fault sample into the principal component clustering space that responds to the initial fault angle according to step 4 in the spec...

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 relates to a current transient quantity principal component cluster analysis direction protection method for a power transmission line with a static synchronous series compensator, and belongs to the technical field of relay protection of power systems. The method includes the steps that when a failure occurs in the power transmission line with the static synchronous series compensator, principal component analysis is conducted on line mode current data with failure phases, wherein the line mode current data are acquired at the measurement end of the line in a window at 1ms; whether the failure is the forward failure or the reverse failure is distinguished according to whether the projection q1 of the sample data on a first principal component (PC1) axis. Through principal component cluster analysis direction protection of line mode currents with failure phases, whether the failure is the forward failure or the reverse failure can be reliably distinguished, whether the forward failure is located on the left side of the SSSC or the right side of the SSSC can also be distinguished, and sections of the failure can be reliably recognized, and therefore a basis for highly reliably recognizing the property of the forward failure and the property of the reverse failure is provided.

Description

technical field [0001] The invention relates to a method for protecting the direction of a current transient quantity principal component clustering analysis direction of a transmission line with a static synchronous series compensator, and belongs to the technical field of electric power system relay protection. Background technique [0002] In recent years, due to the application of a large number of FACTS devices in the power grid, the transient process of power grid faults has become increasingly complicated, and higher requirements have been put forward for relay protection. In a system containing FACTS components, since the control parameters of FACTS components may change according to different operating conditions of the system, the amplitude and frequency of harmonics and transient components generated by faults will also vary depending on different components and fault locations The changes not only brought difficulties to the adjustment of traditional protection, ...

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): G01R31/08
Inventor 束洪春苏玉格高利曹璞璘黄沈峰
Owner KUNMING UNIV OF SCI & 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