Three-phase unbalance restraining method of same-tower multi-circuit transmission line

A technology for transmission lines and multiple circuits on the same tower

Inactive Publication Date: 2014-11-05
SHANGHAI UNIVERSITY OF ELECTRIC POWER
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is aimed at the problem that the unbalance degree of the transmission line cannot meet the requirements by using the optimal phase sequence arrangement of the line, and proposes a three-phase unbalance suppression method for multi-circuit transmission lines on the same tower. Compensate t

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
  • Three-phase unbalance restraining method of same-tower multi-circuit transmission line
  • Three-phase unbalance restraining method of same-tower multi-circuit transmission line
  • Three-phase unbalance restraining method of same-tower multi-circuit transmission line

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0027] A three-phase unbalance suppression method for multi-circuit transmission lines on the same tower includes the following steps:

[0028] S1) such as figure 1 The schematic diagram of the compensation asymmetry parameters of the double circuit line on the same tower is shown. According to the transmission line conductor type, conductor splitting method, tower type, etc., refer to the following formula to calculate the initial impedance matrix of the line.

[0029] Z nn = R + 0.05 + j 0.145 ( lg 2 l r e - 1 ) Ω / km Z mn = 0.05 + j 0.0145 ( lg 2 l d mn - 1 ) Ω / km

[0030] Where Z nn Is the self impedance of line n, Z mn Is the mutual impedance between line m and n, l is the length of the wire; R is the resistance of the wire or lightning conductor corresponding to line n; r e Is the effective radius of the wire or lightning line corresponding to line n; d mn Is ...

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 three-phase unbalance restraining method of a same-tower multi-circuit transmission line. A line impedance matrix is worked out according to the conductor type, the conductor division method, the rod tower type and the connecting method of a lightning conductor; the current and voltage equation of the transmission line is provided according to the conditions of the transmission line, the negative sequence and zero sequence current expressions each time are obtained through matrix transformation and conversion of symmetrical components; negative sequence and zero sequence current sensitive impedance parameters are found according to the obtained negative sequence and zero sequence current expressions; compensation capacitors are configured according to the obtained sensitive impedance parameters, the sensitive impedance parameters are compensated for to the minimum in order to restrain negative sequence and zero sequence current. By compensating for the negative sequence and zero sequence current sensitive impedance parameters, adjustment of line parameters is achieved, the unbalance problem of the same-tower multi-circuit transmission line can be effectively restrained, and theoretic basis and guidance for safe, stable and economical operation of the same-tower multi-circuit transmission line are provided.

Description

technical field [0001] The invention relates to the technical field of multi-circuit power transmission on the same tower, in particular to a method for suppressing three-phase unbalance of multi-circuit power transmission lines on the same tower. Background technique [0002] The multi-circuit power transmission technology on the same tower refers to a new type of power transmission technology that uses the same tower to erect two or more power transmission lines for power transmission. It has many advantages such as saving line corridors, increasing transmission capacity, and reducing power construction costs. It can well adapt to Due to the rapid economic development, the tension of transmission line corridors and the increase in power demand have been widely used throughout the country, and significant economic benefits have been achieved. [0003] Due to the compact structure of the multi-circuit transmission line on the same tower, the arrangement of the lines is compl...

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): H02J3/26
CPCY02E40/50
Inventor 王育飞薛花徐兴
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap