CN105811446B - A kind of DC converter station and DC transmission system - Google Patents
A kind of DC converter station and DC transmission system Download PDFInfo
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- CN105811446B CN105811446B CN201610270353.2A CN201610270353A CN105811446B CN 105811446 B CN105811446 B CN 105811446B CN 201610270353 A CN201610270353 A CN 201610270353A CN 105811446 B CN105811446 B CN 105811446B
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- converter station
- earthing pole
- converter
- earthing
- transmission system
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The present invention discloses a kind of DC converter station, is related to direct current transportation field, can reduce DC converter station brought maximally potential rise in the process of running, alleviates DC converter station to invasion caused by ambient enviroment.The specific scheme is that the DC converter station connects the first earthing pole, wherein first ground connection is extremely allocated to the earthing pole of the DC converter station；The DC converter station is also connected at least one second earthing pole, wherein second ground connection is extremely allocated to the earthing pole of other DC converter stations, wherein each DC converter station configures a corresponding earthing pole；The DC converter station passes through first earthing pole and at least one described second earthing pole to ground discharge in the process of running.Deployment connection of the present invention for DC converter station in DC transmission system.
Description
Technical field
The present invention relates to direct current transportation field more particularly to a kind of DC converter stations and DC transmission system.
Background technique
The sending end of DC transmission system is completed to hand over/directly conversion, transmits electric energy to receiving end with DC form, receiving end is complete
It exports and exchanges to power grid after Cheng Zhi/friendship conversion.DC converter station in DC transmission system is connected by an earthing pole and the earth
It connects.DC transmission system in the process of running, has very big DC current by earthing pole and flows into the earth from DC converter station,
Or DC converter station is flowed into from the earth.In extra-high voltage DC transmission system, DC converter station by being injected at earthing pole or
The DC current of extraction can be up to several kiloamperes.
In engineering practice, the earthing pole and metal buried metal pipeline, especially long range On The Oil And Gas Transportation of DC converter station
Piping laying address is close to each other inevitable.And long range metal buried metal pipeline surface corrosion-resistant layer cleaner is inevitably deposited
In breaking point.When the both ends of pipeline anticorrosion coating breaking point are there are when potential difference, electric current will flow in metallic conduit, generate pipe
Potential difference between ground potential and segmented conduit.Electric current generates anode reaction when flowing into the earth by pipeline, form hot spot.Separately
Outside, the potential difference between pipe to soil potential, segmented conduit will affect pipe-line wrapping and personal safety.
Electric current between the earthing pole and the earth of DC converter station, forms staircase signal distribution in the soil and soil is spuious
Electric current can have an impact neighbouring buried metal pipeline.
In the faster coastal region in east China of economic development, the especially areas such as Guangdong, Shanghai, energy-output ratio is big, as very
The receiving end of more DC transmission engineerings is that direct current grounding pole is distributed the region concentrated, while the still dense region of oil-gas pipeline, directly
It is more significant to flow influence of the electric current between converter station and the earth to buried metal pipeline.
In the prior art, usually in a manner of reinforcing buried metal pipeline protection, the Potential distribution in soil is reduced to burying
The influence of ground metallic conduit, however this mode is often with high costs, under the strong invasion caused by kilo-ampere electric current, prevents
It is limited to protect effect.Therefore, how to reduce DC converter station itself to invasion caused by ambient enviroment, become one it is urgently to be resolved
The problem of.
Summary of the invention
The application provides a kind of DC converter station and DC transmission system, can reduce DC converter station in the process of running
Brought maximally potential rise alleviates DC converter station to invasion caused by ambient enviroment.
In order to achieve the above objectives, the application adopts the following technical scheme that
In a first aspect, providing a kind of DC converter station, the DC converter station connects the first earthing pole, wherein described first
Ground connection is extremely allocated to the earthing pole of the DC converter station；
The DC converter station is also connected at least one second earthing pole, wherein second ground connection is extremely allocated to it
The earthing pole of its DC converter station, wherein each DC converter station configures a corresponding earthing pole；The DC converter
It stands and passes through first earthing pole and at least one described second earthing pole in the process of running to ground discharge.
Second aspect, provides a kind of DC transmission system, and the DC transmission system includes being located at same power supply area
The receiving end of at least two DC power transmission lines, wherein each receiving end includes at least one DC converter station, each direct current is changed
One corresponding earthing pole of stream station configuration；
At least one described DC converter station includes the first DC converter station, first DC converter station be it is described at least
Any one DC converter station in one DC converter station；First DC converter station connects the first earthing pole, wherein institute
State the earthing pole that the first ground connection is extremely allocated to first DC converter station；
The DC converter station is also connected at least one second earthing pole, wherein second ground connection is extremely allocated to institute
The earthing pole of other DC converter stations in DC transmission system is stated, the DC converter station passes through described first in the process of running
Earthing pole and at least one described second earthing pole are to ground discharge.
DC converter station and DC transmission system provided by the embodiment of the present invention, by by a DC converter station
Multiple at least two earthing poles are connected, the earth current of DC converter station is effectively shunted, are reduced single when DC converter station operation
Maximally potential rise around earthing pole to reduce the maximally potential rise in entire earthing pole cluster regions, and makes entire
The ground potential liter distribution of each point is more balanced in earthing pole cluster regions, to reduce DC converter station to the shadow of surrounding enviroment
It rings.Have benefited from the homogenization of the maximally reduction of potential rise and Potential distribution, the current potential subtractive between buried metal pipeline is each
Small, the DC current of flow ipe reduces, to be easier to take safeguard procedures.Equally, the electromagnetism in earthing pole cluster regions
Environment accordingly improves, to reduce the protection threshold of electromagnetic equipment.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, embodiment will be described below
Needed in attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only of the invention some
Embodiment for those of ordinary skill in the art without creative efforts, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is the connection schematic diagram of DC converter station and earthing pole provided by the embodiment of the present invention；
Fig. 2 is another connection schematic diagram of DC converter station and earthing pole provided by the embodiment of the present invention；
Fig. 3 is another connection schematic diagram of DC converter station and earthing pole provided by the embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In the process of running, DC current passes through earthing pole from DC converter station to DC converter station in DC transmission system
The earth is flowed into, or flows into DC converter station from the earth." DC converter station to ground discharge " retouches in the embodiment of the present invention
It states for referring to above-mentioned two situations.
DC converter station forms the electric current between the earthing pole of DC converter station and the earth, in the soil to ground discharge
The distribution of current potential ladder and soil stray electrical current are formed, periphery electromagnetic environment is caused to deteriorate, causes to generate buried metal pipeline rotten
The adverse consequences such as erosion, electromagnetic equipment damage.The maximum that brought ground potential rises when by DC converter station to ground discharge
Value, referred to as maximally potential rise, it is an object of the invention to discuss how to reduce maximally potential rise, to reduce DC converter station
Influence to surrounding enviroment, to weaken the negative effect to circumferential metal, electromagnetic equipment etc., below in conjunction with implementation of the invention
Example is to solving the problems, such as that this scheme illustrates.
Embodiment
The embodiment of the present invention provides a kind of DC converter station, as shown in connection with fig. 1, the connection of DC converter station 10 at least two
Earthing pole, including the first earthing pole 101 and at least one second earthing pole 102, Fig. 1 show the quantity of the second earthing pole 102
The case where being 1.
First ground connection is extremely allocated to the earthing pole of DC converter station 10, usually and in the converter valve of DC converter station 10
Property point is apart from nearest earthing pole.
In the earthing pole that at least one second earthing pole 102 is disposed by 10 location of DC converter station, select nearby
It is allocated to the earthing pole of other DC converter stations.For example, with the huge power supply area of electrical energy demands as Shanghai, as very much
The receiving end of DC transmission engineering, construction have multiple DC converter stations, and each DC converter station configures corresponding earthing pole, Duo Gezhi
Stream converter station and multiple earthing poles are distributed in the power supply area everywhere.Signified DC converter station 10, Ke Yiwei in the present embodiment
It is distributed in any one in a power supply area in multiple DC converter stations.DC converter station 10 and at least two earthing poles connect
It connects, including the first earthing pole 101 and at least one second earthing pole 102, the second earthing pole 102 is according in power supply area
The case where earthing pole actual deployment, what is selected nearby is allocated to the earthing pole of other DC converter stations.
DC converter station 10 passes through at least two earthing poles (first earthing pole 101 and at least one in the process of running
A second earthing pole 102) to ground discharge.
DC converter station 10 causes ground potential to rise to ground discharge, in the soil formed current potential ladder distribution, pass through by
Direct current changes converter station 10 and connect at least two earthing poles, and at least two earthing poles share discharge current, compares DC converter station
By an earthing pole to the scheme of ground discharge, maximally potential rise is reduced brought by single earthing pole, reduces and connects
Influence of the earth polar to surrounding enviroment.
In addition, multiple earthing poles enter ground since the electric current between at least two earthing poles and the earth is DC current
Synergistic effect between ground potential caused by electric current plays the role of cancelling out each other or weaken, and further decreases multiple connect
Each point maximum potential difference that may be present in the region of earth polar reduces influence of the DC converter station to surrounding enviroment.
For ease of description, being referred to by the first earthing pole and the second earthing pole at least two earthing poles in the present embodiment
Two earthing poles.
Optionally, the first earthing pole 101 and/or the second earthing pole 102 are also connect with other converter stations.Wherein "and/or"
Indicate may exist three kinds of relationships, the first earthing pole 101 and/or the second earthing pole 102 indicate, the first earthing pole of individualism
101 or second earthing pole 102 the case where being connect with other converter stations, the first earthing pole 101 and the second earthing pole 102 with it is other
The case where converter station connects.
As shown in connection with fig. 2, DC converter station 10 is connected with the first earthing pole 101 and the second earthing pole 102 is connect, wherein
First earthing pole 101 is also connect with DC converter station 20 and DC converter station 30, and the second earthing pole 102 only connects DC converter station
10.DC converter station 20 and DC converter station 30 can respectively connect other earthing poles, be not drawn into Fig. 2.
On the basis of connection relationship shown in Fig. 2, if the later period builds new DC converter station 30, and DC converter station 30
Position be closely located to the second earthing pole 102, then DC converter station 30 can be connect with the second earthing pole 102, and further
Connect the close earthing pole (being not drawn into Fig. 3) of other positions.Pass through the connection of multi-to-multi between DC converter station and earthing pole
One electric current between DC converter station and the earth is distributed to multiple earthing poles by relationship.Meanwhile two or more
DC converter station can share same earthing pole.Ground potential liter caused by different earthing poles is cancelled out each other or is weakened.It is single
It is directly proportional to the size of current injected at this that ground potential around one earthing pole rises approximation, when between DC converter station and earthing pole
When being reduced to 1/N by the electric current that multi-to-multi interconnection injects an earthing pole, the ground potential liter near the earthing pole also declines
For 1/N, the potential difference that buried metal pipeline longitudinally undertakes also falls to 1/N, it is seen that earthing pole is caused by buried metal pipeline
Influence substantially reduces.
DC converter station provided by the embodiment of the present invention has by the connection relationship of multi-to-multi between earthing pole
Effect shunts the earth current of DC converter station, reduces maximally electric in entire earthing pole cluster regions when DC converter station operation
Position rises, and keeps the ground potential liter distribution of each point in entire earthing pole cluster regions more balanced, to reduce DC converter station
Influence to surrounding enviroment.
Have benefited from the homogenization of the maximally reduction of potential rise and Potential distribution, the current potential between buried metal pipeline is each
Difference reduces, and the DC current of flow ipe reduces, to be easier to take safeguard procedures.Equally, in earthing pole cluster regions
Electromagnetic environment accordingly improves, to reduce the protection threshold of electromagnetic equipment.
The embodiment of the present invention also provides a kind of DC transmission system, and DC transmission system includes being located at same power supply area
At least two DC power transmission lines receiving end, wherein each receiving end includes at least one DC converter station, each DC converter
It stands and configures a corresponding earthing pole.
At least one DC converter station in DC transmission system includes the first DC converter station, and the first DC converter station is
Any one DC converter station at least one DC converter station.It can be with reference to straight to illustrating for the first DC converter station
Stream changes converter station 10, and details are not described herein again.
First DC converter station connects the first earthing pole, wherein the first ground connection is extremely allocated to connecing for the first DC converter station
Earth polar.It is closer to be advisable with the first DC converter station and the first earthing pole in engineering practice, therefore the first earthing pole can be
Converter valve neutral point with straight first-class converter station is apart from nearest earthing pole.
First DC converter station is also connected at least one second earthing pole, wherein to be extremely allocated to direct current defeated for the second ground connection
The earthing pole of other DC converter stations in electric system in engineering practice, from the earthing pole that power supply area is disposed, selects nearby
The earthing pole for being allocated to other DC converter stations in DC transmission system as the second earthing pole.
First DC converter station passes through the first earthing pole and at least one second earthing pole to greatly putting in the process of running
Electricity.
DC transmission system provided by the embodiment of the present invention passes through multi-to-multi between DC converter station and earthing pole
Connection relationship effectively shunts the earth current of DC converter station, reduces entire earthing pole cluster regions when DC converter station operation
Interior maximally potential rise, and keep the ground potential liter distribution of each point in entire earthing pole cluster regions more balanced, to reduce
Influence of the DC converter station to surrounding enviroment.
Have benefited from the homogenization of the maximally reduction of potential rise and Potential distribution, the current potential between buried metal pipeline is each
Difference reduces, and the DC current of flow ipe reduces, to be easier to take safeguard procedures.Equally, in earthing pole cluster regions
Electromagnetic environment accordingly improves, to reduce the protection threshold of electromagnetic equipment.
More than, it is merely preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto, it is any
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, such as
Various replacements etc. to transformer in bipolar MMC-HVDC transmission system, should be covered by the protection scope of the present invention.
Protection scope of the present invention should be subject to the protection scope in claims.
Claims (6)
1. a kind of DC converter station, which is characterized in that
The DC converter station connects the first earthing pole, wherein first ground connection is extremely allocated to connecing for the DC converter station
Earth polar；
The DC converter station is also connected at least two second earthing poles, wherein second ground connection be extremely allocated to it is other straight
The earthing pole of converter station is flowed, wherein each DC converter station configures a corresponding earthing pole；The DC converter station exists
Pass through first earthing pole and at least two second earthing pole in operational process to ground discharge；Described at least two
In the two ground connection earthing poles that extremely DC converter station location is disposed, what is selected nearby is allocated to connecing for other DC converter stations
Earth polar.
2. DC converter station according to claim 1, which is characterized in that
First ground connection is extremely with the converter valve neutral point of the DC converter station apart from nearest earthing pole.
3. DC converter station according to claim 2, which is characterized in that
First earthing pole and/or second earthing pole are also connect with other converter stations.
4. a kind of DC transmission system, which is characterized in that
The DC transmission system includes the receiving end of at least two DC power transmission lines positioned at same power supply area, wherein each
Receiving end includes at least one DC converter station, and each DC converter station configures a corresponding earthing pole；
At least one described DC converter station includes the first DC converter station, first DC converter station be it is described at least one
Any one DC converter station in DC converter station；First DC converter station connects the first earthing pole, wherein described the
One ground connection is extremely allocated to the earthing pole of first DC converter station；
First DC converter station is also connected at least two second earthing poles, wherein second ground connection is extremely allocated to institute
The earthing pole of other DC converter stations in DC transmission system is stated, first DC converter station passes through described in the process of running
First earthing pole and at least two second earthing pole are to ground discharge；The extremely described power supply of at least two second ground connection
In the earthing pole that region is disposed, what is selected nearby is allocated to the ground connection of other DC converter stations in the DC transmission system
Pole.
5. DC transmission system according to claim 4, which is characterized in that
First ground connection is extremely with the converter valve neutral point of the DC converter station apart from nearest earthing pole.
6. DC transmission system according to claim 4, which is characterized in that
First earthing pole also in the DC transmission system in addition to first DC converter station it is other at least one
Converter station connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610270353.2A CN105811446B (en) | 2016-04-26 | 2016-04-26 | A kind of DC converter station and DC transmission system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610270353.2A CN105811446B (en) | 2016-04-26 | 2016-04-26 | A kind of DC converter station and DC transmission system |
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| CN105811446A CN105811446A (en) | 2016-07-27 |
| CN105811446B true CN105811446B (en) | 2018-12-18 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5644482A (en) * | 1995-07-06 | 1997-07-01 | Asea Brown Boveri Ab | HVDC transmission system with multiple converter stations |
| CN201226416Y (en) * | 2008-07-03 | 2009-04-22 | 上海市电力公司超高压输变电公司 | Special grounding network for restraining DC magnetic bias phenomena transformer neutral point |
| CN103913655A (en) * | 2014-03-17 | 2014-07-09 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Direct-current common grounding electrode state monitoring system and state assessment method |
-
2016
- 2016-04-26 CN CN201610270353.2A patent/CN105811446B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5644482A (en) * | 1995-07-06 | 1997-07-01 | Asea Brown Boveri Ab | HVDC transmission system with multiple converter stations |
| CN201226416Y (en) * | 2008-07-03 | 2009-04-22 | 上海市电力公司超高压输变电公司 | Special grounding network for restraining DC magnetic bias phenomena transformer neutral point |
| CN103913655A (en) * | 2014-03-17 | 2014-07-09 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Direct-current common grounding electrode state monitoring system and state assessment method |
Non-Patent Citations (1)
| Title |
|---|
| "常规接地极与公用接地极的接地性能与技术经济比较";郭剑;《电力建设》;20110930;第32卷(第9期);第37-41页 * |
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| CN105811446A (en) | 2016-07-27 |
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Effective date of registration: 20210810 Address after: 510663 3 building, 3, 4, 5 and J1 building, 11 building, No. 11, Ke Xiang Road, Luogang District Science City, Guangzhou, Guangdong. Patentee after: China Southern Power Grid Research Institute Co.,Ltd. Patentee after: TSINGHUA University Address before: 510080 West Tower, Yuedian building, No.8 shuijungang, Dongfeng East Road, Yuexiu District, Guangzhou City, Guangdong Province Patentee before: China Southern Power Grid Research Institute Co.,Ltd. Patentee before: CSG POWER GRID TECHNOLOGY RESEARCH CENTER Patentee before: TSINGHUA University |
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