CN104408272A - System and method for evaluating influence of direct current bias in mountainous area environment - Google Patents
System and method for evaluating influence of direct current bias in mountainous area environment Download PDFInfo
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- CN104408272A CN104408272A CN201410794811.3A CN201410794811A CN104408272A CN 104408272 A CN104408272 A CN 104408272A CN 201410794811 A CN201410794811 A CN 201410794811A CN 104408272 A CN104408272 A CN 104408272A
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Abstract
The invention relates to a system and a method for evaluating influence of direct current bias in a mountainous area environment. The evaluation system comprises a mountainous area model building module, an evaluation model building module and an evaluation result acquisition module, wherein the mountainous area model building module is used for establishing a mountainous area environment model which conforms to the actual environment; the evaluation model building module is sued for adding a power grid topology model to the mountainous area environment model to form a complete evaluation model; and the evaluation result acquisition module is used for acquiring and outputting an influence result of direct current bias in the mountainous area environment. Compared with the prior art, the system and the method have the advantages of high accuracy, suitability for complicated environment and the like.
Description
Technical field
The present invention relates to transforming plant DC magnetic saturation control field, especially relate to the DC magnetic biasing effect appraise system and method under the environment of a kind of mountain area.
Background technology
China experiences more than two decades from introducing DC transmission system, and current existing DC line number and planning construction DC transmission system scale are first of the world.In recent years along with the economic development of eastern region, it also grows with each passing day to the demand of electric power.The concentrated of electric load has caused series of problems, it is also proposed unprecedented challenge to the development of power technology.The external DC transmission system earthing pole built up is selected, in meagrely-populated river, river, lake and coastal area, often to impact slighter to other system usually.But for East China, because the factors such as populous, urbanization speed cause the difficulty of the earthing pole addressing of straight-flow system.Earthy marked change can be caused when straight-flow system monopolar operation, and then have influence on the equipment of AC transmission system, communication system and other above earth potential sensitivities.
Although had more research in the earth potential that grounding electrode electric current causes when direct current transportation monopolar operation and earth current distribution, but for the earth potential under the complicated terrain environments such as inland, mountain area, basin and DC magnetic biasing impact evaluation aspect, still there are some difficult problems and not yet solve.
Summary of the invention
Object of the present invention be exactly provide to overcome defect that above-mentioned prior art exists that a kind of accuracy is high, DC magnetic biasing effect appraise system and method under the mountain area environment that is applicable to complex environment.
Object of the present invention can be achieved through the following technical solutions:
A DC magnetic biasing effect appraise system under the environment of mountain area, comprising:
Module set up by mountain area environmental model, for setting up the mountain area environmental model conformed to actual environment;
Module set up by evaluation model, for adding power grid topology model on the environmental model of described mountain area, forms complete evaluation model;
Evaluation result acquisition module, affects result for the DC magnetic biasing obtained under the environment of mountain area according to described evaluation model and exports.
Described mountain area environmental model comprises mountain range model and basin model.
Described evaluation result acquisition module comprises:
DC current calculates unit, for calculating the DC current that AC transformer neutral point flows through according to evaluation model;
Evaluation result output unit, obtaining DC magnetic biasing according to the DC current calculated affects result and exports.
A DC magnetic biasing effect appraise method under the environment of mountain area, comprises the following steps:
1) the mountain area environmental model conformed to actual environment is set up;
2) on the environmental model of described mountain area, add power grid topology model, form complete evaluation model;
3) DC magnetic biasing obtained under the environment of mountain area according to described evaluation model affects result and exports.
Described step 1) in set up mountain area environmental model comprise mountain range model and basin model.
Described step 1) in, when setting up basin model, its electric resistance of soil is horizontal slice structure, and each layer soil resistivity is independently arranged.
Described step 1) in, mountain range model and basin model intersect formation mountain area environmental model, and its interface place, electric resistance of soil is horizontal vertical structure.
Described step 3) be specially:
301) according to the DC current that evaluation model calculating AC transformer neutral point flows through;
302) DC current calculated obtains DC magnetic biasing to be affected result and exports.
Described step 301) in, adopt the DC current that CDEGS software for calculation acquisition AC transformer neutral point flows through.
Compared with prior art, the present invention has the following advantages:
(1) the present invention carries out Accurate Model to actual mountain area environment, improves the accuracy of DC magnetic biasing effect appraise, can be applicable to containing the complicated geological environment such as mountain range, basin.
(2) the present invention is simply effective, and computational accuracy is high.
Accompanying drawing explanation
Fig. 1 is schematic flow sheet of the present invention;
The mountain area environmental model schematic diagram that Fig. 2 sets up for the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.The present embodiment is implemented premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
The embodiment of the present invention provides the system of the DC magnetic biasing effect appraise under the environment of a kind of mountain area, comprises that module set up by mountain area environmental model, module set up by evaluation model and evaluation result acquisition module.Mountain area environmental model sets up module for setting up the mountain area environmental model conformed to actual environment, and the mountain area environmental model set up comprises mountain range model and basin model.Evaluation model sets up module for adding power grid topology model on the environmental model of described mountain area, forms complete evaluation model, and power grid topology model is the model of the existing description electrical network distribution generally used.The DC magnetic biasing that evaluation result acquisition module is used for obtaining under the environment of mountain area according to described evaluation model affects result and exports.Wherein, the evaluation result acquisition module DC current comprised for calculating the DC current that AC transformer neutral point flows through according to evaluation model calculates unit and obtains DC magnetic biasing according to the DC current calculated affects result and exports and evaluation result output unit.
As shown in Figure 1, the evaluation method of the DC magnetic biasing effect appraise system under the environment of above-mentioned mountain area specifically comprises the following steps:
In a step 101, the mountain area environmental model, mountain range model and the basin model that conform to actual environment is set up.Wherein, what mountain range model described is the mountain range that topsoil resistivity is very high, and its soil is based on rock, and soil resistivity is more than several thousand ohms, and when setting up mountain range model, soil resistivity can be specified arbitrarily.What basin model described is the basin that topsoil resistivity is lower, and its soil, with in horizontal slice structure, may contain underground water, topsoil resistivity is lower, and lower soil resistivity is higher, when setting up basin model, electric resistance of soil is horizontal slice structure, and each layer resistivity can independently be arranged.The mountain range model set up and basin model intersect formation mountain area environmental model, and its interface place, electric resistance of soil is horizontal vertical structure.
In a step 102, mountain area environmental model adds power grid topology model, form complete evaluation model.
In step 103, according to the DC current that evaluation model adopts CDEGS software for calculation calculating AC transformer neutral point to flow through.
At step 104, the DC current of calculating obtains DC magnetic biasing affects result and exports.
For the DC magnetic biasing proficiency assessment result of actual area electrical network, validity of the present invention is described below.
Have the regional power grid near a direct current grounding pole, need assessment DC magnetic biasing to affect level, range of value is 500kV AC Substation 2,220kV AC Substation 9.
Traditional DC magnetic biasing evaluation profile do not considered in the situation of mountain range, the present invention and measured result contrast are as shown in table 1.Do not consider the DC magnetic biasing evaluation profile in the situation of mountain range, result of calculation that the present invention obtains and actual measurement deviation situation as shown in table 2.
Table 1 transformer station exchanges in the every phase winding of main transformer flows through DC magnetic bias current (unit: A)
| Transformer station | Electric pressure | Conventional model | Model of the present invention | Actual measurement |
| A | 500kV | 4.26 | 6.45 | 3.3 |
| B | 500kV | 2.75 | 0.41 | 2.2 |
| C | 220kV | 13.11 | 6.75 | 6.4 |
| D | 220kV | 20.05 | 23.60 | 20.6 |
| E | 220kV | 1.93 | 3.10 | 2.6 |
| F | 220kV | 1.09 | 4.61 | 1.9 |
| G | 220kV | 2.22 | 4.30 | 4.6 |
| H | 220kV | 0.26 | 3.39 | 3.7 |
| I | 220kV | 16.33 | 17.64 | 21.8 |
| J | 220kV | 0.07 | 8.70 | 3.2 |
| K | 220kV | 2.01 | 0.63 | 0.03 |
Table 2 result of calculation deviation profile statistical form (unit: A)
By table 2 result show result of calculation of the present invention and measured result deviation less, more tally with the actual situation.
Claims (9)
1. the DC magnetic biasing effect appraise system under the environment of mountain area, is characterized in that, comprising:
Module set up by mountain area environmental model, for setting up the mountain area environmental model conformed to actual environment;
Module set up by evaluation model, for adding power grid topology model on the environmental model of described mountain area, forms complete evaluation model;
Evaluation result acquisition module, affects result for the DC magnetic biasing obtained under the environment of mountain area according to described evaluation model and exports.
2. the DC magnetic biasing effect appraise system under the environment of mountain area according to claim 1, is characterized in that, described mountain area environmental model comprises mountain range model and basin model.
3. the DC magnetic biasing effect appraise system under the environment of mountain area according to claim 1, is characterized in that, described evaluation result acquisition module comprises:
DC current calculates unit, for calculating the DC current that AC transformer neutral point flows through according to evaluation model;
Evaluation result output unit, obtaining DC magnetic biasing according to the DC current calculated affects result and exports.
4. the DC magnetic biasing effect appraise method under the environment of mountain area, is characterized in that, comprise the following steps:
1) the mountain area environmental model conformed to actual environment is set up;
2) on the environmental model of described mountain area, add power grid topology model, form complete evaluation model;
3) DC magnetic biasing obtained under the environment of mountain area according to described evaluation model affects result and exports.
5. the DC magnetic biasing effect appraise method under the environment of mountain area according to claim 4, is characterized in that, described step 1) in set up mountain area environmental model comprise mountain range model and basin model.
6. the DC magnetic biasing effect appraise method under the environment of mountain area according to claim 5, is characterized in that, described step 1) in, when setting up basin model, its electric resistance of soil is horizontal slice structure, and each layer soil resistivity is independently arranged.
7. the DC magnetic biasing effect appraise method under the environment of mountain area according to claim 5, is characterized in that, described step 1) in, mountain range model and basin model intersect formation mountain area environmental model, and its interface place, electric resistance of soil is horizontal vertical structure.
8. the DC magnetic biasing effect appraise method under the environment of mountain area according to claim 4, is characterized in that, described step 3) be specially:
301) according to the DC current that evaluation model calculating AC transformer neutral point flows through;
302) DC current calculated obtains DC magnetic biasing to be affected result and exports.
9. the DC magnetic biasing effect appraise method under the environment of mountain area according to claim 8, is characterized in that, described step 301) in, adopt the DC current that CDEGS software for calculation acquisition AC transformer neutral point flows through.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106021651A (en) * | 2016-05-09 | 2016-10-12 | 国网上海市电力公司 | A method for finite element calculation of direct currents under complicated geological conditions |
| CN109510199A (en) * | 2018-12-18 | 2019-03-22 | 上海电力设计院有限公司 | A kind of distributed generation resource access grid simulation method and system |
| CN112070327A (en) * | 2019-06-10 | 2020-12-11 | 西安建筑科技大学 | Site selection method, device and storage medium for urban cultural land planning |
Citations (1)
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| JP2004304628A (en) * | 2003-03-31 | 2004-10-28 | Tdk Corp | Multilayer substrate for power amplifier module, and power amplifier module |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004304628A (en) * | 2003-03-31 | 2004-10-28 | Tdk Corp | Multilayer substrate for power amplifier module, and power amplifier module |
Non-Patent Citations (1)
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| 蒋伟: "UHVDC输电引起变压器直流偏磁及其抑制措施的研究", 《中国博士学位论文全文数据库 工程科技Ⅱ辑》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106021651A (en) * | 2016-05-09 | 2016-10-12 | 国网上海市电力公司 | A method for finite element calculation of direct currents under complicated geological conditions |
| CN106021651B (en) * | 2016-05-09 | 2019-03-22 | 国网上海市电力公司 | The finite element method of DC current under a kind of complex geological condition |
| CN109510199A (en) * | 2018-12-18 | 2019-03-22 | 上海电力设计院有限公司 | A kind of distributed generation resource access grid simulation method and system |
| CN112070327A (en) * | 2019-06-10 | 2020-12-11 | 西安建筑科技大学 | Site selection method, device and storage medium for urban cultural land planning |
| CN112070327B (en) * | 2019-06-10 | 2023-06-16 | 西安建筑科技大学 | Site selection method, device and storage medium for urban cultural land planning |
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