String complement capacitance transmission line distance protecting method based on model recognition

A technology of model identification and distance protection, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of low protection sensitivity, destroy the linear relationship between transmission line impedance and distance, etc., to improve sensitivity and overcome the influence of distance protection. Effect

Active Publication Date: 2008-08-27
XI AN JIAOTONG UNIV +1
View PDF0 Cites 30 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the series compensation capacitor destroys the linear relationship between the impedance of the transmission line and the distance. When the traditional distance protection is applied to the series compensation line, the capacitive reactance Z of the series compensation capacitor m

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
  • String complement capacitance transmission line distance protecting method based on model recognition
  • String complement capacitance transmission line distance protecting method based on model recognition
  • String complement capacitance transmission line distance protecting method based on model recognition

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Referring to Figure 1, a protection device is provided at the M end of the line. The protection device measures the three-phase voltage and current at the M end of the line through a voltage transformer TV and a current transformer TA, and passes the analog measurement value through a low-pass filter, sample holder and After the A / D converter, it is sent to the microcomputer processor (DSP), and the microcomputer processor transmits the judgment result to the relay through the photoelectric isolator to perform the corresponding protection action.

[0023] Refer to Figure 2, which is a diagram of the fault model before the series compensation capacitor. There is an equation for a single-phase (take A phase as an example) ground fault u Am = R ( i Am + k R i m ...

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 the field of distance protection research for power transmission line with series compensation capacitor, in particular to a series compensation capacitor power transmission line distance protection method based on model identification. In the method, model identification technology is adopted, a front fault model before the series compensation capacitor is built up, the sampled current and voltage values at the protected site are input into the model for parameters estimation, and at last the error coefficient EF is worked out; the position of the fault point relative to the series compensation capacitor can be determined according to the relationship between the error coefficient and the fixed value, and the fault within the protection range can be detected with the cooperation of an impedance element; in this way the motion of the protection device can be controlled. The method can tell the position of single phase grounding fault point in a series compensation line relative to the series compensation capacitor; combined with the impedance element, the method can eliminate the influence on distance protection from the series compensation capacitor and can improve the sensitivity of the protection device.

Description

Technical field [0001] The invention relates to the research field of distance protection for series compensation lines, and more particularly to a distance protection method for transmission lines with series compensation capacitors based on model recognition. Background technique [0002] Series capacitance compensation is an effective means to improve the economy and reliability of transmission lines. Its main function is to improve the transmission capacity of the power system by controlling the power flow; improve the stability of the power system; improve voltage quality and reactive power balance; reduce system Line loss improves line transmission capacity. It also has the function of improving the transient stability of the system, optimizing the power flow of the transmission line and reducing the loss of the system. [0003] However, the series compensation capacitor destroys the linear relationship between the impedance of the transmission line and the distance. The ca...

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): H02H7/26
Inventor 索南加乐顾嘉粟小华张健康
Owner XI AN JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products