CN103795075B - Transmission line three-phase current unbalance Traverse phase-order arrangement adjusting method in transformer station - Google Patents
Transmission line three-phase current unbalance Traverse phase-order arrangement adjusting method in transformer station Download PDFInfo
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- CN103795075B CN103795075B CN201410022007.3A CN201410022007A CN103795075B CN 103795075 B CN103795075 B CN 103795075B CN 201410022007 A CN201410022007 A CN 201410022007A CN 103795075 B CN103795075 B CN 103795075B
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- loop transmission
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- phase
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 115
- 238000000034 method Methods 0.000 title claims abstract description 10
- 238000000819 phase cycle Methods 0.000 claims abstract description 26
- 238000004364 calculation method Methods 0.000 claims abstract description 12
- 238000004088 simulation Methods 0.000 claims abstract description 8
- 230000001052 transient effect Effects 0.000 claims description 4
- 238000000205 computational method Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
Abstract
The invention discloses transmission line three-phase current unbalance Traverse phase-order arrangement adjusting method in a kind of transformer station; the three-phase current unbalance degree solved due to existing transmission line aggravates, and causes the problem that the misoperation of the bus of transformer station and power transmission line zero-sequence protection frequently occurs.The present invention be first according to transformer station entirely stand all transmission lines use tower and phase sequence arrangement and actual track length, set up the unsymmetrical current Simulation Calculation of each loop transmission line connected, then, calculate transformer station entirely to stand positive and negative, the zero-sequence current of every bar transmission line and zero sequence, negative-sequence current degree of unbalance.By changing the phase sequence arrangement of transmission line wire, the zero sequence of this loop transmission line and negative-sequence current degree of unbalance are controlled below 5%, until calculate all transmission lines of transformer station zero, negative-sequence current degree of unbalance is all less than 5%.For entirely the stand optimal arrangement of Traverse phase-order of all transmission lines of transformer station provides a kind of simple and practical method of adjustment.
Description
Technical field
The present invention relates to the method for adjustment of the Traverse phase-order arrangement of transmission line three-phase current unbalance in a kind of transformer station, be applicable to carry out rational phase sequence arrangement to the transmission pressure of the many back transmission lines of transformer station, make entirely the stand degree of unbalance of electric current of transformer station drop to minimum.
Background technology
Along with the quick growth of power load; a large amount of short-range single back transmission lines and same tower double back transmission line is there is in electrical network; these short-range transmission lines generally adopt the mode of the erection that do not replace; three-phase current unbalance degree is aggravated; cause the misoperation of the bus of transformer station and power transmission line zero-sequence protection frequently to occur, have influence on the safe operation of electrical network.Entangle its reason: one is the designing requirement according to transmission line, do not replace when transmission line is less than 100 kilometers completely, these short (or ultrashort) circuits not carrying out replacing increase too many; Two is impacts that many lists return the construction of line that not replace with common-tower double-return and in succession put into operation; These two reasons directly cause part power transmission line electrical parameter unbalance, and then cause three-phase current unbalance degree to increase.
Summary of the invention
The invention provides transmission line three-phase current unbalance Traverse phase-order arrangement adjusting method in a kind of transformer station; the three-phase current unbalance degree solved due to existing transmission line aggravates, and causes the technical problem that the misoperation of the bus protection of transformer station and power transmission line zero-sequence protection frequently occurs.
The present invention solves above technical problem by the following technical programs:
Transmission line three-phase current unbalance Traverse phase-order arrangement adjusting method in a kind of transformer station, comprises the following steps:
The first step, the N loop transmission line of entirely standing connected by transformer station sort, the electric current of the first loop transmission line is represented with subscript I, represented with subscript II by the electric current of second servo loop transmission line, by that analogy, the electric current of the N loop transmission line that transformer station stands entirely represents with subscript N;
The phase sequence arrangement of second step, entirely to stand for transformer station the actual track length of connected each loop transmission line, the tower used and transmission line, sets up the unsymmetrical current Simulation Calculation of respective loop transmission line respectively;
3rd step, the unsymmetrical current Simulation Calculation of the first loop transmission line set up according to second step, utilize EM transient calculation method, calculate the forward-order current of the first loop transmission line
, negative-sequence current
, zero-sequence current
;
4th step, following formulae discovery is utilized to go out the zero-sequence current degree of unbalance of the first loop transmission line and the negative-sequence current degree of unbalance of the first loop transmission line:
；
If the zero-sequence current degree of unbalance of the 5th step first loop transmission line
i 0
phI with the negative-sequence current degree of unbalance of the first loop transmission line
i 2
phI there is one more than 5%, then change the phase sequence arrangement of the first loop transmission line, repeat the step of above-mentioned second step to the 4th step, if the zero-sequence current degree of unbalance of the first loop transmission line newly calculated
i 0
phI with the negative-sequence current degree of unbalance of the first loop transmission line
i 2
phI still have one more than 5%, then change the phase sequence arrangement of the first loop transmission line, repeat the step of above-mentioned second step to the 4th step, until the zero-sequence current degree of unbalance of the first loop transmission line calculated
i 0
phI with the negative-sequence current degree of unbalance of the first loop transmission line
i 2
phI all be less than till 5%, the phase sequence of the first loop transmission line is now arranged as adjusts to the right place;
6th step, repeat second step to the step of the 5th step to second servo loop transmission line to N loop transmission line successively, the phase sequence arrangement phase sequence of second servo loop transmission line being aligned to N loop transmission line is all adjusted to the right place.
The invention solves the transmission system three-phase current unbalance that existing transformer station stands entirely because single back transmission line and double back transmission line cause due to Traverse phase-order unreasonable structure and arrangement; for entirely the stand optimal arrangement of Traverse phase-order of all transmission lines of transformer station provides a kind of simple and practical method of adjustment; overcome the bus protection of transformer station and the misoperation of power transmission line zero-sequence protection, ensure the safe operation of electrical network.
Embodiment
The present invention is described in detail below:
Transmission line three-phase current unbalance Traverse phase-order arrangement adjusting method in a kind of transformer station, comprises the following steps:
The first step, the N loop transmission line of entirely standing connected by transformer station sort, the electric current of the first loop transmission line is represented with subscript I, represented with subscript II by the electric current of second servo loop transmission line, by that analogy, the electric current of the N loop transmission line that transformer station stands entirely represents with subscript N;
The phase sequence arrangement of second step, entirely to stand for transformer station the actual track length of connected each loop transmission line, the tower used and transmission line, sets up the unsymmetrical current Simulation Calculation of respective loop transmission line respectively;
3rd step, the unsymmetrical current Simulation Calculation of the first loop transmission line set up according to second step, utilize EM transient calculation method, calculate the forward-order current of the first loop transmission line
, negative-sequence current
, zero-sequence current
;
4th step, following formulae discovery is utilized to go out the zero-sequence current degree of unbalance of the first loop transmission line and the negative-sequence current degree of unbalance of the first loop transmission line:
；
If the zero-sequence current degree of unbalance of the 5th step first loop transmission line
i 0
phI with the negative-sequence current degree of unbalance of the first loop transmission line
i 2
phI there is one more than 5%, then change the phase sequence arrangement of the first loop transmission line, repeat the step of above-mentioned second step to the 4th step, if the zero-sequence current degree of unbalance of the first loop transmission line newly calculated
i 0
phI with the negative-sequence current degree of unbalance of the first loop transmission line
i 2
phI still have one more than 5%, then change the phase sequence arrangement of the first loop transmission line, repeat the step of above-mentioned second step to the 4th step, until the zero-sequence current degree of unbalance of the first loop transmission line calculated
i 0
phI with the negative-sequence current degree of unbalance of the first loop transmission line
i 2
phI all be less than till 5%, the phase sequence of the first loop transmission line is now arranged as adjusts to the right place;
6th step, repeat second step to the step of the 5th step to second servo loop transmission line to N loop transmission line successively, the phase sequence arrangement phase sequence of second servo loop transmission line being aligned to N loop transmission line is all adjusted to the right place.
The present invention be first according to transformer station entirely stand all transmission lines use tower and phase sequence arrangement and actual track length, set up the unsymmetrical current Simulation Calculation of each loop transmission line connected, then, calculate transformer station entirely to stand positive and negative, the zero-sequence current of every bar transmission line and zero sequence, negative-sequence current degree of unbalance.Due to same tower double back transmission line Traverse phase-order be arranged with 36 kinds, single back transmission line phase sequence is arranged with 6 kinds, by changing the phase sequence arrangement of transmission line wire, the zero sequence of this loop transmission line and negative-sequence current degree of unbalance controlled below 5%.Constantly repeat above-mentioned computational methods, until calculate all transmission lines of transformer station zero, negative-sequence current degree of unbalance is all less than 5%, the conducting wire phase sequence so just determining all transmission lines in full station is arranged as the arrangement of best phase sequence.
The computational methods of current unbalance factor make use of EM transient calculation method, every bar transmission line positive and negative, zero-sequence current computational methods are as follows:
Wherein:
a=e j120 °
for the vector calculus factor;
Zero-sequence current degree of unbalance computing formula is:
Zero-sequence current degree of unbalance=(zero-sequence current/forward-order current) × 100%;
Negative-sequence current degree of unbalance computing formula is:
Negative-sequence current degree of unbalance=(negative-sequence current/forward-order current) × 100%.
Claims (1)
1. a transmission line three-phase current unbalance Traverse phase-order arrangement adjusting method in transformer station, comprises the following steps:
The first step, the N loop transmission line of entirely standing connected by transformer station sort, the electric current of the first loop transmission line is represented with subscript I, represented with subscript II by the electric current of second servo loop transmission line, by that analogy, the electric current of the N loop transmission line that transformer station stands entirely represents with subscript N;
The phase sequence arrangement of second step, entirely to stand for transformer station the actual track length of connected each loop transmission line, the tower used and transmission line, sets up the unsymmetrical current Simulation Calculation of respective loop transmission line respectively;
3rd step, the unsymmetrical current Simulation Calculation of the first loop transmission line set up according to second step, utilize EM transient calculation method, calculate the forward-order current of the first loop transmission line
, negative-sequence current
, zero-sequence current
;
4th step, following formulae discovery is utilized to go out the zero-sequence current degree of unbalance of the first loop transmission line and the negative-sequence current degree of unbalance of the first loop transmission line:
If the zero-sequence current degree of unbalance of the 5th step first loop transmission line
i 0
phI with the negative-sequence current degree of unbalance of the first loop transmission line
i 2
phI there is one more than 5%, then change the phase sequence arrangement of the first loop transmission line, repeat the step of above-mentioned second step to the 4th step, if the zero-sequence current degree of unbalance of the first loop transmission line newly calculated
i 0
phI with the negative-sequence current degree of unbalance of the first loop transmission line
i 2
phI still have one more than 5%, then change the phase sequence arrangement of the first loop transmission line, repeat the step of above-mentioned second step to the 4th step, until the zero-sequence current degree of unbalance of the first loop transmission line calculated
i 0
phI with the negative-sequence current degree of unbalance of the first loop transmission line
i 2
phI all be less than till 5%, the phase sequence of the first loop transmission line is now arranged as adjusts to the right place;
6th step, repeat second step to the step of the 5th step to second servo loop transmission line to N loop transmission line successively, the phase sequence arrangement phase sequence of second servo loop transmission line being aligned to N loop transmission line is all adjusted to the right place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410022007.3A CN103795075B (en) | 2014-01-18 | 2014-01-18 | Transmission line three-phase current unbalance Traverse phase-order arrangement adjusting method in transformer station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410022007.3A CN103795075B (en) | 2014-01-18 | 2014-01-18 | Transmission line three-phase current unbalance Traverse phase-order arrangement adjusting method in transformer station |
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| Publication Number | Publication Date |
|---|---|
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| CN103795075B true CN103795075B (en) | 2015-09-09 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108631341B (en) * | 2018-05-17 | 2021-12-21 | 福建奥通迈胜电力科技有限公司 | Zero-sequence current-based three-phase unbalance evaluation method for distribution transformer low-voltage side current |
| CN113752921A (en) * | 2021-10-20 | 2021-12-07 | 西南交通大学 | Method for erecting special power transmission line for electrified railway |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6738719B2 (en) * | 2001-09-13 | 2004-05-18 | Abb Power Automation Ltd. | Crossover fault classification for power lines with parallel circuits |
| CN102916427B (en) * | 2012-09-25 | 2014-09-17 | 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 |
| CN102938010A (en) * | 2012-12-10 | 2013-02-20 | 上海市电力公司 | Parallel circuit unbalance degree analysis method |
| CN103235198B (en) * | 2013-04-14 | 2015-03-25 | 国家电网公司 | Method for determining phase sequence arrangement modes of conducting wires of same-tower double-circuit transmission lines |
| CN103412199B (en) * | 2013-08-12 | 2016-05-25 | 上海电力学院 | A kind of computational methods of same many back transmission lines of tower degree of unbalancedness |
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