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

A voltage sag source location method based on limited power quality monitoring points

A technology of power quality monitoring and voltage sag source, which is applied in the field of voltage sag source location based on limited power quality monitoring points, and can solve problems such as failure to truly realize sag source judgment

Active Publication Date: 2016-08-31
STATE GRID CORP OF CHINA +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods are all for the purpose of judging whether the sag source is located upstream or downstream of the monitoring device, and cannot really realize the judgment of the specific location of the sag source

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 voltage sag source location method based on limited power quality monitoring points
  • A voltage sag source location method based on limited power quality monitoring points
  • A voltage sag source location method based on limited power quality monitoring points

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0106] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0107] Such as figure 1 , the present invention provides a voltage sag source location method based on limited power quality monitoring points, said method comprising the following steps:

[0108] Step 1: Form a network node impedance matrix;

[0109] Step 2: Arrange monitoring points;

[0110] Step 3: judging the fault type of the faulty line;

[0111] Step 4: Locate the sag source.

[0112] In the step 1, the branch addition method is used to form the network node impedance matrix, and the network node impedance matrix uses Z (s) means, where s=0,1,2, then Z (1) ,Z (2) and Z (0) Represent the positive, negative and zero-sequence node impedance matrices of the network, respectively.

[0113] Such as figure 2 , the step 2 includes the following steps:

[0114] Step 2-1: According to the network node impedance matrix Z (s) , to determine the voltag...

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 voltage sag source locating method based on limited electric energy quality monitoring points. The method includes the steps that network node impedance matrixes are formed; the monitoring points are arranged; the fault types of faulty lines are judged; voltage sag source locating is carried out. According to the method, the fault types are estimated according to monitored node voltage vectors, virtual fault points are supposed in the possible faulty lines, calculated values of voltages of the monitoring points are acquired through a fault distance distribution function, a voltage sag fault source is located according to analysis results of errors between the calculated values and measured values, and false fault points can be dealt with.

Description

technical field [0001] The invention relates to a positioning method, in particular to a voltage sag source positioning method based on limited power quality monitoring points. Background technique [0002] Voltage sag refers to a short-term voltage fluctuation phenomenon in which the root mean square value of a node in the power supply system decreases to between 0.1p.u and 0.9p.u. and lasts for 10ms to 1min. Short-circuit faults in power systems are the main cause of voltage sags. Voltage sag can cause computer systems, electronic equipment, industrial process equipment, etc. to fail to work normally, and has become the most important power quality problem, which has attracted the common attention of power companies and power users around the world. [0003] At present, the power quality monitoring system has been widely used. Most power companies and users have installed power quality monitoring devices according to their own needs, so that power quality problems such as...

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): G01R31/08G01R31/02
Inventor 刘颖英王同勋丁宁冯丹丹周胜军
Owner STATE GRID CORP OF CHINA
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