CN103235198A - Method for determining phase sequence arrangement modes of conducting wires of same-tower double-circuit transmission lines - Google Patents

Method for determining phase sequence arrangement modes of conducting wires of same-tower double-circuit transmission lines Download PDF

Info

Publication number
CN103235198A
CN103235198A CN2013101270959A CN201310127095A CN103235198A CN 103235198 A CN103235198 A CN 103235198A CN 2013101270959 A CN2013101270959 A CN 2013101270959A CN 201310127095 A CN201310127095 A CN 201310127095A CN 103235198 A CN103235198 A CN 103235198A
Authority
CN
China
Prior art keywords
order
transmission line
phase
tower double
zero
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN2013101270959A
Other languages
Chinese (zh)
Other versions
CN103235198B (en
Inventor
唐震
张友富
张悦
梁建伟
赵云峰
张健
刘永鑫
陈广君
王皑
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
Original Assignee
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by State Grid Corp of China SGCC, Electric Power Research Institute of State Grid Shanxi Electric Power Co Ltd filed Critical State Grid Corp of China SGCC
Priority to CN201310127095.9A priority Critical patent/CN103235198B/en
Publication of CN103235198A publication Critical patent/CN103235198A/en
Application granted granted Critical
Publication of CN103235198B publication Critical patent/CN103235198B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a method for determining phase sequence arrangement modes of conducting wires of same-tower double-circuit transmission lines. By the aid of the method, the problem of highlighted imbalance of three-phase currents of a transmission system due to an existing unreasonable phase sequence arrangement mode of conducting wires of same-tower double-circuit transmission lines is solved. The method includes selecting a phase sequence arrangement mode of the conducting wires of the same-tower double-circuit transmission lines according to a tower type used by the same-tower double-circuit transmission lines and lengths of actual circuits, and then computing positive-sequence currents, negative-sequence currents and zero-sequence currents of the two circuits of the same-tower double-circuit transmission lines by an electromagnetic transient calculation process; and respectively computing imbalance degrees of the zero-sequence currents of the I<th> circuit and imbalance degrees of the zero-sequence currents of the II<th> circuit in all the phase sequence arrangement modes of the conducting wires of the same-tower double-circuit transmission lines so as to determine that the phase sequence arrangement mode, which corresponds to the lowest imbalance degrees of the zero-sequence currents, of the conducting wires is the optimal phase sequence arrangement mode of the conducting wires of the same-tower double-circuit transmission lines. The method for determining the optimal phase sequence arrangement mode of the conducting wires of the same-tower double-circuit transmission lines has the advantages of simplicity and practicality.

Description

Definite method that a kind of Traverse phase-order of same tower double back transmission line is arranged
Technical field
The present invention relates to a kind of definite method of Traverse phase-order arrangement of same tower double back transmission line, particularly how a kind of transmission pressure on same tower double back transmission line carries out definite method that the phase sequence arrangement just can reach the Traverse phase-order arrangement that the current imbalance degree is little and the counterattack lightning withstand level is high.
Background technology
Along with the continuous quickening of Urbanization in China and the quick growth of power load, the same tower double back transmission line that electricity is carried in a large amount of short distances appears in electrical network, this same tower double back transmission line generally adopts not replace and sets up, and its phase sequence is arranged the system's three-phase current unbalance problem that causes and become increasingly conspicuous.Phase sequence is arranged protection malfunctions such as can not only causing the transmission line of electricity zero sequence, and also influential to lightning protection properties.According to the designing requirement of transmission line of electricity, do not replace during completely less than 100 kilometers at transmission line of electricity.Along with increasing of weak point (or ultrashort) circuit and cut-offfing of some original full transposition circuits; and many common-tower double-returns all multifactor influences such as circuit puts into operation in succession that do not replace; cause the part electrical network to cause three-phase current obviously uneven because electric parameter is asymmetric; cause misoperation or the startup of relay protection and automatic safety device, had a strong impact on the safe operation of electrical network.
Summary of the invention
The invention provides a kind of definite method of Traverse phase-order arrangement of same tower double back transmission line, solve the Traverse phase-order unreasonable structure and arrangement of existing same tower double back transmission line, caused transmission system three-phase current unbalance and the lower technical matters of counterattack lightning withstand level.
The present invention overcomes the above problems by the following technical programs:
Definite method that a kind of Traverse phase-order of same tower double back transmission line is arranged may further comprise the steps:
The first step, according to the length of tower that same tower double back transmission line uses and actual track, a kind of Traverse phase-order on earlier selected this same tower double back transmission line is arranged, and uses I I Expression the IThe electric current of loop transmission line is used I II Expression the IIThe electric current of loop transmission line;
Second the step, utilize the electro-magnetic transient computing method, calculate positive and negative, the zero-sequence current in two loops of same tower double back transmission line;
The 3rd step, the following formula of utilization calculate the zero sequence circulation degree of unbalancedness of same tower double back transmission line:
Figure 852429DEST_PATH_IMAGE002
The 4th step, the following formula of utilization calculate the negative phase-sequence circulation degree of unbalancedness of same tower double back transmission line:
Figure 300727DEST_PATH_IMAGE004
；
The 5th step, the following formula of utilization calculate the zero sequence through unbalance degree of same tower double back transmission line:
；
The 6th step, the following formula of utilization calculate the negative phase-sequence through unbalance degree of same tower double back transmission line:
；
The 7th step, the IThe zero-sequence current degree of unbalancedness of loop transmission line is as follows:
Figure 821205DEST_PATH_IMAGE010
；
The 8th step, the IIThe zero-sequence current degree of unbalancedness of loop transmission line is as follows:
Figure 643667DEST_PATH_IMAGE012
；
The 9th step, other 35 kinds of Traverse phase-order of selected this same tower double back transmission line upper conductor are arranged successively again, arrange at every kind of Traverse phase-order, repeat above second step to the 8th step, calculate every kind of Traverse phase-order the under arranging IThe zero-sequence current degree of unbalancedness of loop transmission line and IIThe zero-sequence current degree of unbalancedness of loop transmission line;
The tenth step, the under every kind of Traverse phase-order arranged IThe zero-sequence current degree of unbalancedness of loop transmission line and IIThe zero-sequence current degree of unbalancedness summation back of loop transmission line obtains zero-sequence current degree of unbalancedness integrated value divided by 2,36 kinds of Traverse phase-order are arranged, size by this zero-sequence current degree of unbalancedness integrated value, sort from small to large, thereby determined the out-of-balance current preference ordering N that every kind of Traverse phase-order that these 36 kinds of Traverse phase-order are arranged is arranged;
A kind of Traverse phase-order on the 11 step, selected this same tower double back transmission line is arranged, and calculates the lightning current numerical value of the single back line flashover under this Traverse phase-order arrangement Lightning current numerical value with double-circuit line while flashover
Figure 388562DEST_PATH_IMAGE016
, according to formula: Calculate the comprehensive counterattack lightning withstand level under this Traverse phase-order arrangement
Figure 581963DEST_PATH_IMAGE020
Value;
The 12 goes on foot, selectes successively other 35 kinds of Traverse phase-order arrangements on this same tower double back transmission line, arranges at every kind of Traverse phase-order, and the tenth goes on foot more than repeating, and calculates every kind of comprehensive counterattack lightning withstand level under the Traverse phase-order arrangement
Figure 336292DEST_PATH_IMAGE020
Value; 36 kinds of Traverse phase-order are arranged, by comprehensive counterattack lightning withstand level The size of value sorts from small to large, thereby has determined the counterattack lightning withstand level preference ordering M of every kind of Traverse phase-order arrangement that these 36 kinds of Traverse phase-order are arranged;
Obtain final preference ordering W divided by 2 after the out-of-balance current preference ordering N that the 13 step, each Traverse phase-order during 36 kinds of Traverse phase-order are arranged are arranged and the counterattack lightning withstand level preference ordering M addition, compare the preference ordering W that 36 kinds of Traverse phase-order are arranged, the minimum corresponding Traverse phase-order of W value is arranged, for the Traverse phase-order of determined same tower double back transmission line is arranged.
The invention solves the Traverse phase-order unreasonable structure and arrangement of existing same tower double back transmission line, cause transmission system three-phase current unbalance, counterattack lightning withstand level lower technical matters, for the optimal arrangement of the Traverse phase-order of same tower double back transmission line provides a kind of simple and practical method.
Description of drawings
Fig. 1 is common-tower double-return line current synoptic diagram of the present invention.
Embodiment
Specific implementation process of the present invention is as follows:
1, at first according to using tower and phase sequence to arrange and actual track length, sets up emulation out-of-balance current computation model.
2, calculate positive and negative, the zero-sequence current of same tower double back transmission line and zero sequence, negative-sequence current degree of unbalancedness.
3, the phase sequence that changes the same tower double back transmission line lead is arranged, and arranges up to calculating 36 kinds of all phase sequences;
4, set up single time and double loop counterattack lightning withstand level computation model, the list that calculates institute's phase sequence of calculating arrangement in 3 returns and double-circuit line is strikeed back lightning withstand level.
5, according to the ordering of the ordering of current imbalance degree in the above-mentioned calculating and single time and double-circuit line counterattack lightning withstand level, choose the superior of the minimum and counterattack lightning withstand level of current imbalance degree (single time and double loop counterattack lightning withstand level gap minimum for optimum) and arrange for best phase sequence.
6, the computing method of current imbalance degree.
For the common-tower double-return circuit, the coupling between the two loop line roads causes two parameters of returning there are differences, and the same bus of common-tower double-return circuit two terminations, so certainly exist uneven circulation I between the double-circuit line h,
If the electric current on each loop line road of same tower double back transmission line is the order current vector, namely satisfy , size that then should imbalance circulation can be weighed the out-of-balance current difference between the double-circuit line, and it is defined as follows: (subscript I, II represent overhead transmission line respectively twice)
Zero sequence circulation degree of unbalancedness:
Figure DEST_PATH_IMAGE023
Negative phase-sequence circulation degree of unbalancedness:
Figure 88850DEST_PATH_IMAGE004
For other circuit outside the common-tower double-return circuit, the common-tower double-return circuit is reflected in total current after its parallel connection to the influence of out-of-balance current
Figure DEST_PATH_IMAGE025
So, the through unbalance degree of definable electric current, to reflect that it is to the influence of other circuit out-of-balance current of system:
Zero sequence through unbalance degree:
Negative phase-sequence through unbalance degree:
Figure 887490DEST_PATH_IMAGE008
According to above definition, be example with the zero sequence degree of unbalancedness, zero sequence circulation degree of unbalancedness and the addition of zero sequence through unbalance degree can be got:
Figure DEST_PATH_IMAGE027
；
In the ordinary course of things, have
Figure DEST_PATH_IMAGE029
, and
Figure DEST_PATH_IMAGE031
All much larger than
Figure DEST_PATH_IMAGE033
So following formula can be written as:
Figure 593278DEST_PATH_IMAGE010
；
In like manner have:
Figure DEST_PATH_IMAGE034
Therefore can be similar to and think, the zero-sequence current degree of unbalancedness on I loop line road be zero sequence through unbalance degree and zero sequence circulation degree of unbalancedness vector and, the zero-sequence current degree of unbalancedness on II loop line road is that zero sequence through unbalance degree and zero sequence circulation unbalance vector are poor.For the negative phase-sequence degree of unbalancedness, also can calculate equally.

Claims (1)

1. the Traverse phase-order of a same tower double back transmission line definite method of arranging may further comprise the steps:
The first step, according to the length of tower that same tower double back transmission line uses and actual track, a kind of Traverse phase-order on earlier selected this same tower double back transmission line is arranged, and uses I I Expression the IThe electric current of loop transmission line is used I II Expression the IIThe electric current of loop transmission line;
Second the step, utilize the electro-magnetic transient computing method, calculate positive and negative, the zero-sequence current in two loops of same tower double back transmission line;
The 3rd step, the following formula of utilization calculate the zero sequence circulation degree of unbalancedness of same tower double back transmission line:
Figure 2013101270959100001DEST_PATH_IMAGE002
The 4th step, the following formula of utilization calculate the negative phase-sequence circulation degree of unbalancedness of same tower double back transmission line:
；
The 5th step, the following formula of utilization calculate the zero sequence through unbalance degree of same tower double back transmission line:
Figure DEST_PATH_IMAGE006
；
The 6th step, the following formula of utilization calculate the negative phase-sequence through unbalance degree of same tower double back transmission line:
；
The 7th step, the IThe zero-sequence current degree of unbalancedness of loop transmission line is as follows:
Figure DEST_PATH_IMAGE010
；
The 8th step, the IIThe zero-sequence current degree of unbalancedness of loop transmission line is as follows:
Figure DEST_PATH_IMAGE012
；
The 9th step, other 35 kinds of Traverse phase-order of selected this same tower double back transmission line upper conductor are arranged successively again, arrange at every kind of Traverse phase-order, repeat above second step to the 8th step, calculate every kind of Traverse phase-order the under arranging IThe zero-sequence current degree of unbalancedness of loop transmission line and IIThe zero-sequence current degree of unbalancedness of loop transmission line;
The tenth step, the under every kind of Traverse phase-order arranged IThe zero-sequence current degree of unbalancedness of loop transmission line and IIThe zero-sequence current degree of unbalancedness summation back of loop transmission line obtains zero-sequence current degree of unbalancedness integrated value divided by 2,36 kinds of Traverse phase-order are arranged, size by this zero-sequence current degree of unbalancedness integrated value, sort from small to large, thereby determined the out-of-balance current preference ordering N that every kind of Traverse phase-order that these 36 kinds of Traverse phase-order are arranged is arranged;
A kind of Traverse phase-order on the 11 step, selected this same tower double back transmission line is arranged, and calculates the lightning current numerical value of the single back line flashover under this Traverse phase-order arrangement
Figure DEST_PATH_IMAGE014
Lightning current numerical value with double-circuit line while flashover
Figure DEST_PATH_IMAGE016
, according to formula:
Figure DEST_PATH_IMAGE018
Calculate the comprehensive counterattack lightning withstand level under this Traverse phase-order arrangement
Figure DEST_PATH_IMAGE020
Value;
The 12 goes on foot, selectes successively other 35 kinds of Traverse phase-order arrangements on this same tower double back transmission line, arranges at every kind of Traverse phase-order, and the tenth goes on foot more than repeating, and calculates every kind of comprehensive counterattack lightning withstand level under the Traverse phase-order arrangement
Figure DEST_PATH_IMAGE020A
Value; 36 kinds of Traverse phase-order are arranged, by comprehensive counterattack lightning withstand level
Figure DEST_PATH_IMAGE020AA
The size of value sorts from small to large, thereby has determined the counterattack lightning withstand level preference ordering M of every kind of Traverse phase-order arrangement that these 36 kinds of Traverse phase-order are arranged;
Obtain final preference ordering W divided by 2 after the out-of-balance current preference ordering N that the 13 step, each Traverse phase-order during 36 kinds of Traverse phase-order are arranged are arranged and the counterattack lightning withstand level preference ordering M addition, compare the preference ordering W that 36 kinds of Traverse phase-order are arranged, the minimum corresponding Traverse phase-order of W value is arranged, for the Traverse phase-order of determined same tower double back transmission line is arranged.
CN201310127095.9A 2013-04-14 2013-04-14 Method for determining phase sequence arrangement modes of conducting wires of same-tower double-circuit transmission lines Active CN103235198B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310127095.9A CN103235198B (en) 2013-04-14 2013-04-14 Method for determining phase sequence arrangement modes of conducting wires of same-tower double-circuit transmission lines

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310127095.9A CN103235198B (en) 2013-04-14 2013-04-14 Method for determining phase sequence arrangement modes of conducting wires of same-tower double-circuit transmission lines

Publications (2)

Publication Number Publication Date
CN103235198A true CN103235198A (en) 2013-08-07
CN103235198B CN103235198B (en) 2015-03-25

Family

ID=48883249

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310127095.9A Active CN103235198B (en) 2013-04-14 2013-04-14 Method for determining phase sequence arrangement modes of conducting wires of same-tower double-circuit transmission lines

Country Status (1)

Country Link
CN (1) CN103235198B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103795075A (en) * 2014-01-18 2014-05-14 国家电网公司 Phase sequence arrangement adjustment method for three-phase current unbalanced wires of transmission lines in transformer substation
CN103795074A (en) * 2014-01-18 2014-05-14 国家电网公司 Method for adjusting electric transmission line wire phase sequence arrangement according to current phase angles and amplitude values
CN103810329A (en) * 2014-01-18 2014-05-21 国家电网公司 Method for adjusting phase sequence arrangement of electric transmission line wire according to electric transmission line power
CN106097143A (en) * 2016-06-15 2016-11-09 国网江西省电力科学研究院 A kind of method choosing the optimum phase sequence arrangement mode of multiple-circuit on same tower

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101246190A (en) * 2008-03-25 2008-08-20 江苏省电力试验研究院有限公司 Idem lever multi-loop overhead transmission line zero sequence equivalent impedance computing method in different modes
CN101593964A (en) * 2009-06-30 2009-12-02 许继电气股份有限公司 The method for longitudinal zero-sequence power direction protection of double-circuit lines on the same pole
CN101871982A (en) * 2010-06-01 2010-10-27 佛山市中格威电子有限公司 Method and circuit for detecting phase sequence and asymmetrical voltage of three phase current
CN102916427A (en) * 2012-09-25 2013-02-06 广东电网公司电力科学研究院 Method for calculating integrated three-phase imbalance degree of multi-circuit transmission lines

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101246190A (en) * 2008-03-25 2008-08-20 江苏省电力试验研究院有限公司 Idem lever multi-loop overhead transmission line zero sequence equivalent impedance computing method in different modes
CN101593964A (en) * 2009-06-30 2009-12-02 许继电气股份有限公司 The method for longitudinal zero-sequence power direction protection of double-circuit lines on the same pole
CN101871982A (en) * 2010-06-01 2010-10-27 佛山市中格威电子有限公司 Method and circuit for detecting phase sequence and asymmetrical voltage of three phase current
CN102916427A (en) * 2012-09-25 2013-02-06 广东电网公司电力科学研究院 Method for calculating integrated three-phase imbalance degree of multi-circuit transmission lines

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103795075A (en) * 2014-01-18 2014-05-14 国家电网公司 Phase sequence arrangement adjustment method for three-phase current unbalanced wires of transmission lines in transformer substation
CN103795074A (en) * 2014-01-18 2014-05-14 国家电网公司 Method for adjusting electric transmission line wire phase sequence arrangement according to current phase angles and amplitude values
CN103810329A (en) * 2014-01-18 2014-05-21 国家电网公司 Method for adjusting phase sequence arrangement of electric transmission line wire according to electric transmission line power
CN106097143A (en) * 2016-06-15 2016-11-09 国网江西省电力科学研究院 A kind of method choosing the optimum phase sequence arrangement mode of multiple-circuit on same tower

Also Published As

Publication number Publication date
CN103235198B (en) 2015-03-25

Similar Documents

Publication Publication Date Title
Nayak et al. Wide-area measurement-based backup protection for power network with series compensation
CN103475004B (en) Suppress static reacance generator SVG and the control method of unbalanced load
Gao et al. Design and evaluation of a directional algorithm for transmission-line protection based on positive-sequence fault components
CN106684834B (en) A kind of power distribution network adaptive Current Protection system and method
CN109217302B (en) The evaluation method of Traditional DC receiving end grid strength in a kind of mixing multi-infeed systems
CN109901013B (en) Method for judging fault direction of power distribution network by using polarity of current and voltage sudden change
CN105024364A (en) Analysis method for influence on distance protection caused by access of large-scale wind power equipment to AC/DC hybrid system
CN109001592A (en) A kind of resonant earthed system fault line selection method for single-phase-to-ground fault based on transient
CN104901308A (en) Power system critical circuit identification method
CN104167726A (en) Calculation method of single-phase multi-feed-in interaction effect factor based on impedance matrix
CN103337840A (en) Control method of large AC-DC interconnected power grid short-circuit current limiter electromechanical transient model
CN103235198B (en) Method for determining phase sequence arrangement modes of conducting wires of same-tower double-circuit transmission lines
CN105071447A (en) Alternating current/direct-current hybrid connection multi-infeed direct-current receiving end power grid strength obtaining method
CN103412199A (en) Computing method of unbalancedness of multi-circuit power transmission lines on same tower
Marchesan et al. Method for distributed generation anti-islanding protection based on singular value decomposition and linear discrimination analysis
CN104237741A (en) Intelligent station domain information based double-circuit line fault phase selection method
CN112526396A (en) Multi-loop line ground fault analysis method and device, electronic equipment and storage medium
CN103795075B (en) Transmission line three-phase current unbalance Traverse phase-order arrangement adjusting method in transformer station
CN105738751A (en) Setting calculation method for bus differential protection current loop line disconnection alarm fixed value
CN107064727B (en) A kind of distribution network fault line selection method based on transient state energy difference
CN104410071A (en) 35KV high voltage distribution network loop-closing and loop-opening current estimation method
CN103760463A (en) Low-current line selection method based on DTU
CN104730417B (en) It is a kind of using negative-sequence current as the transmission line of electricity method of single end distance measurement of amount of polarization
CN107959276A (en) A kind of adaptive reclosing method of single loop line
CN203037723U (en) Measurement device of double-loop-on-same-tower power transmission line unbalanced current

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant