CN104834819B - A kind of method for determining to draw outer earth mat optimal location - Google Patents
A kind of method for determining to draw outer earth mat optimal location Download PDFInfo
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- CN104834819B CN104834819B CN201510239511.3A CN201510239511A CN104834819B CN 104834819 B CN104834819 B CN 104834819B CN 201510239511 A CN201510239511 A CN 201510239511A CN 104834819 B CN104834819 B CN 104834819B
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- resistance
- earth
- earth mat
- grounding electrode
- earthed system
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Abstract
The invention discloses a kind of method for determining and drawing outer earth mat optimal location, it is characterised in that：Set up main earth mat and draw outer earth mat not equipotential model, be calculated earthed system earth resistance.Set up with the minimum object function of earthed system earth resistance, to connect line length as the mathematic optimal model of variable.Its optimal connection line length is obtained using genetic algorithm, thus may determine that drawing outer earth mat optimum position so that draw outer earth mat resistance reducing effect and reach preferably while taking into account economy.
Description
Technical field
The invention discloses a kind of method for determining and drawing outer earth mat connecting line optimization length, it is related to Grounding Technology of Modern Power System
Field, it is adaptable to using outer earth mat reduction earth resistance is drawn in power engineering construction field, draw the determination of outer earth mat position.
Background technology
As modern power network develops towards the direction such as super-pressure, Large Copacity, remote, for power system security, stabilization
Service requirement more and more higher, it is therefore desirable to good earthed system.To reduce the earth resistance of transmission transformer station earthed system, it is ensured that
The safe and reliable operation of power system, drop resistance is carried out in engineering frequently with auxiliary earth measure.
There is certain impedance in itself due to connecting line, therefore connection line length can influence to draw the resistance reducing effect of outer earth mat.
Draw outer earth mat apart from main earth mat it is near when, due to there is larger screen effect, draw outer earth mat resistance reducing effect unobvious；Draw outer earth mat
Apart from main earth mat farther out when, connecting line originally has certain impedance, and the resistance reducing effect for drawing outer earth mat is negligible, it is thus determined that drawing
The position of outer earth mat has great importance for resistance reducing effect and economy.
The content of the invention
In order to overcome drawbacks described above, the technical problems to be solved by the invention to be：It is optimal that outer earth mat is drawn in a kind of determination of offer
The method of position, the method can determine that the optimal location i.e. optimization length of connecting line for drawing outer earth mat.
To realize above-mentioned technical purpose, the present invention is achieved through the following technical solutions：One kind determines to draw outer earth mat connecting line
The method of optimal location, the method includes following steps：
The first step:Earthed system not equipotential model is set up, earthed system earth resistance is obtained；
Second step:Set up with the minimum object function of earthed system earth resistance, connection line length l is the optimization of independent variable
Model；
3rd step:Using genetic algorithm, connecting line optimization length is obtained, and obtain the minimum earth resistance of earthed system
Value.
In the first step, the earthed system earth resistance of the not equipotential model is：
Wherein：Main earth mat is designated as R from resistance11, draw outer earth mat and be designated as R from resistance22, connect line resistance and be designated as REven, main earth mat and draw
Mutual resistance between outer earth mat is designated as R12。
In second step, following mathematic optimal model is set up
Wherein：L is connection line length, and R (l) is earthed system earth resistance.
The detailed process of the 3rd step is：Real coding is carried out to connection line length, the population of individuality is randomly generated, by R
L () is calculated the fitness value in population at individual as the fitness function of genetic algorithm.And the individuality in population is carried out
Selection, intersection, mutation operation, concrete operations are as follows：
1st, select：Selection operation constitutes new population, the something lost from old population with the excellent individuality of certain probability selection
, using wheel disc bet method, i.e. individual adaptation degree individuality high, the probability chosen is big, so ensures excellent for propagation algorithm selection operation
Body retains.
2nd, intersect：Because individuality uses real coding, i.e., according to certain crossover probability, randomly choose crossover location.
3rd, make a variation：Under given mutation probability, variable position is randomly choosed.
Investigate again and whether meet termination condition (whether reaching maximum iteration), optimal connection line length is obtained if meeting
Degree and corresponding grounding resistance, are such as unsatisfactory for, then be back to selection operation.
For the present invention is better described, by main earth mat and outer earth mat is drawn and has been replaced with two vertical grounding electrodes respectively, vertically
It is connected by connecting line between earthing pole.
Beneficial effects of the present invention are：The resistance reducing effect for drawing outer earth mat can be made full use of, it is obtained and is drawn outer earth mat most
Excellent placement location, takes into account economy and resistance reducing effect.
Brief description of the drawings
Fig. 1 is earthed system not equipotential model；
Fig. 2 is not equipotential model under vertical grounding electrode；
Fig. 3 is connecting line length change, earthed system earth resistance change curve；
Fig. 4 is genetic algorithm flow chart.
Specific embodiment
Technical solution of the present invention is described in further detail with specific embodiment below in conjunction with the accompanying drawings.Wherein it is grounded
Pole #1, earthing pole #2 are illustrated using vertical grounding electrode.So that those skilled in the art can be better understood from this hair
It is bright and can be practiced, but illustrated embodiment is not as a limitation of the invention.
Fig. 1 is earthed system not equipotential model, draws outer earth mat by the main earth mats of #1 and #2 and connecting line is constituted；It is described
The main earth mats of #1 voltage be V1, the electric current for flowing into the earth is I1；The voltage that described #2 draws outer earth mat is V2, flow into the earth
Electric current is I2；The electric current of the connecting line is I2。
Fig. 2 is not equipotential model under vertical grounding electrode, by vertical grounding electrode #1, vertical grounding electrode #2 and ground wire structure
Into by taking #1, #2 vertical grounding electrode positioned at uniform soil (resistivity is ρ) as an example, thus model can obtain its earthed system
Earth resistance.
--- system earth resistance
Wherein：--- vertical grounding electrode #1 hinders certainly
--- vertical grounding electrode #2 hinders certainly
REven=R0L--- connects line resistance
--- #1 and #2 vertical grounding electrode mutual resistance
Wherein：ρ is uniform soil resistivity, Ω m
L1It is the length of vertical grounding electrode 1, m
L2It is the length of vertical grounding electrode 2, m
A is vertical grounding electrode radius, m
L is the length between earthing pole, m
R0It is connecting line unit resistance, Ω/m
I is earthed system earth current, A
V1It is vertical grounding electrode #1 voltages, V
I1It is the electric current that the earth is flowed into by vertical grounding electrode #1, A
I2It is the electric current that the earth is flowed into by vertical grounding electrode #2 electric currents, A
Setting vertical grounding electrode #1, #2 length is 40m, and soil resistivity is 1000 Ω m.Vertical grounding electrode and connection
Line radius is 0.1m, and connecting line unit resistance is 0.5 Ω/km.
Fig. 3 is with connecting line length change, the change curve of earthed system earth resistance, it can be seen that depositing
In an optimal connection line length so that earthed system earth resistance is minimum.Therefore the optimal value is obtained using genetic algorithm.
Fig. 4 is the flow chart of genetic algorithm.By the optimizing of genetic algorithm, obtain when connection line length is 2222.84m meters
When, earthed system earth resistance reaches minimum value, and minimum value is 13.30 Ω.Emulated through CDEGS simultaneously, when connection line length is
During 2222.84m, its earth resistance is 12.85 Ω.Both differences are 3.3%, illustrate that above-mentioned earth resistance calculates the accurate of formula
Property.
Embodiments of the invention are these are only, the scope of the claims of the invention is not thereby limited, it is every to be said using the present invention
Equivalent structure or equivalent flow conversion that bright book and accompanying drawing content are made, or directly or indirectly it is used in other related skills
Art field, is included within the scope of the present invention.
Claims (1)
1. a kind of method that outer earth mat connecting line optimal location is drawn in determination, the method includes following steps：
The first step:Earthed system not equipotential model is set up, earthed system earth resistance is obtained；The not equipotential model connects
Ground system earth resistance be：
Wherein：Main earth mat is designated as R from resistance11, draw outer earth mat and be designated as R from resistance22, connect line resistance and be designated as REven, main earth mat and draw other places
Mutual resistance between net is designated as R12；Main earth mat and drawing connected by connecting line between outer earth mat；
Earthed system is in equipotential model, main earth mat and draws outer earth mat and is respectively set as vertical grounding electrode #1, vertical grounding electrode #
2,
Wherein：
REven=R0L--- connects line resistance
ρ is uniform soil resistivity, Ω m
L1It is the length of vertical grounding electrode #1, m
L2It is the length of vertical grounding electrode #2, m
A is vertical grounding electrode radius, m
L is the length between earthing pole, m
R0It is connecting line unit resistance, Ω/m
I is earthed system earth current, A
V1It is vertical grounding electrode #1 voltages, V
I1It is the electric current that the earth is flowed into by vertical grounding electrode #1, A
I2It is the electric current that the earth is flowed into by vertical grounding electrode #2 electric currents, A；
Second step:Set up with the minimum object function of earthed system earth resistance, connection line length is the mathematical optimization of independent variable
Model；Set up following mathematic optimal model
Wherein：L is connection line length；
R (l) is earthed system earth resistance,
3rd step:Using genetic algorithm, connecting line optimization length is obtained, and obtain the minimum grounding resistance of earthed system；Tool
Body process is：Real coding is carried out to connection line length, the population of individuality is randomly generated, using R (l) as genetic algorithm
Fitness function, is calculated the fitness value in population at individual；And the individuality in population is selected, is intersected, make a variation behaviour
Make, then investigate whether meet termination condition, i.e., whether reach maximum iteration, such as meet if obtain it is optimal connect line length and
Corresponding grounding resistance, is such as unsatisfactory for, then be back to genetic algorithm selection operation；Selection：Selection operation from old population with
The excellent individuality of certain probability selection constitutes new population, and the genetic algorithm selection operation uses wheel disc bet method, i.e., individual
Fitness individuality high, the probability chosen is big, so ensures that defect individual retains；Intersect：Because individuality is compiled using real number
Code, i.e., according to certain crossover probability, randomly choose crossover location；Variation：Under given mutation probability, random selection becomes dystopy
Put.
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| CN201510239511.3A CN104834819B (en) | 2015-05-07 | 2015-05-07 | A kind of method for determining to draw outer earth mat optimal location |
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| CN104834819B true CN104834819B (en) | 2017-07-04 |
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| CN105738703B (en) * | 2016-03-31 | 2018-09-04 | 南京信息工程大学 | A kind of the on-line measurement device and measurement method of ground resistance |
Citations (3)
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|---|---|---|---|---|
| CN101900766A (en) * | 2009-05-26 | 2010-12-01 | 上海市电力公司 | Method for determining position of voltage electrode in measurement of grounding resistance in transformer substation by short-distance method |
| CN103594826A (en) * | 2013-11-12 | 2014-02-19 | 国家电网公司 | Conductive concrete module grounding grid |
| CN104090169A (en) * | 2014-06-25 | 2014-10-08 | 河海大学 | Method for measuring ground resistance of ground screen in layered slope soil structure |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101114999B1 (en) * | 2010-10-11 | 2012-03-06 | (주)옴니엘피에스 | A device for assessing the length of carbon ground electrode module based on a two-level distributed parameter circuit model and the method thereof |
| US9465067B2 (en) * | 2013-04-08 | 2016-10-11 | ECOLE POLYTECHNIQUE FéDéRALE DE LAUSANNE | Efficient method based on the electromagnetic time reversal to locate faults in power network |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900766A (en) * | 2009-05-26 | 2010-12-01 | 上海市电力公司 | Method for determining position of voltage electrode in measurement of grounding resistance in transformer substation by short-distance method |
| CN103594826A (en) * | 2013-11-12 | 2014-02-19 | 国家电网公司 | Conductive concrete module grounding grid |
| CN104090169A (en) * | 2014-06-25 | 2014-10-08 | 河海大学 | Method for measuring ground resistance of ground screen in layered slope soil structure |
Non-Patent Citations (2)
| Title |
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| 双层土壤地网接地电阻的简化计算;潘文霞等;《高电压技术》;19920930(第8期);第26-30页 * |
| 考虑接触电压的风电机组接地网优化设计;宋景博等;《电瓷避雷器》;20131231(第6期);第56-59页 * |
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