CN109301801A - It is a kind of mutually to use earthing pole wiring construction and bipolar neutral conductor differential protection method of operating - Google Patents
It is a kind of mutually to use earthing pole wiring construction and bipolar neutral conductor differential protection method of operating Download PDFInfo
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- CN109301801A CN109301801A CN201811391312.4A CN201811391312A CN109301801A CN 109301801 A CN109301801 A CN 109301801A CN 201811391312 A CN201811391312 A CN 201811391312A CN 109301801 A CN109301801 A CN 109301801A
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- Prior art keywords
- direct current
- earthing pole
- isolation switch
- pole
- switch
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/268—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for dc systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
Earthing pole wiring construction and bipolar neutral conductor differential protection method of operating are mutually used the present invention relates to a kind of; it includes the first isolation switch; it returns on two DC lines and is connected with back two DC earthing polar circuits; first isolation switch one end is in parallel with two direct current grounding pole circuit on one side are returned, and the first isolation switch other end is connected through the second isolation switch with third isolation switch one end；The third isolation switch other end is in parallel with time direct current grounding pole circuit on one side being connected to back on a DC line；It is in series with EBS switch between the first isolation switch and the second isolation switch, the 2nd IDE_OBP is provided between EBS and the second isolation switch；The first IDE_OBP is provided between third isolation switch and a time DC line.This invention ensures that protection is without dead zone, it is ensured that safe and reliable operation when double back direct current mutually uses earthing pole；And ensure that the normal operation of non-faulting direct current as far as possible, improve the reliability of DC operation.
Description
Technical field
The present invention relates to a kind of extra-high voltage direct-current engineering field, mutual especially with regard to a kind of double back direct current is connect with earthing pole
Cable architecture and bipolar neutral conductor differential protection method of operating.
Background technique
Earthing pole is an important component in D.C. high voltage transmission, provides zero potential for DC loop and clamps down on a little,
And in monopolar ground return operation, circuit is constituted by earthing pole and the earth.Prior art extra-high voltage direct-current engineering is using whole
Flow station, DC line, ground electrode circuit and Inverter Station composition.Once earthing pole is unavailable (break down or overhaul), then directly
Flow forced outage.In order to reduce engineering outage rate, increase economic efficiency, two DC engineerings neighbouring for site can be used mutually
Earthing pole, when the earthing pole of one of DC engineering is unavailable, the earthing pole for borrowing another engineering constitutes transmitting loop, just
Normal transmission power.In order to achieve the above object, as shown in Figure 1, two DC engineerings that site is closed on can be set mutually with ground connection
The equipment such as pole link circuit and relevant change-over switch, disconnecting link, are grounded the mutual use of pole, improve DC operation reliability and
Economic benefit.
When twice direct currents mutually use earthing pole, due to changing bipolar and ground connection polar region connection type, the guarantor in the region
Shield configuration and action policy also need to adjust.Important protection of the bipolar neutral conductor differential protection as bi-pole area, for detecting therefrom
Sexupara line needs to adjust its protection act when twice direct currents mutually use earthing pole to the ground fault between ground connection polar curve lead
Strategy, to adapt to new connection type.
Summary of the invention
In view of the above-mentioned problems, the object of the present invention is to provide a kind of mutually differential with earthing pole wiring construction and the bipolar neutral conductor
Protection act method can guarantee protection without dead zone, it is ensured that safe and reliable operation when double back direct current mutually uses earthing pole.
To achieve the above object, the present invention takes following technical scheme: it is a kind of mutually with earthing pole wiring construction, it is arranged and exists
It returns a direct current and returns on the earthing pole connecting line between two direct currents, it is characterised in that including the first isolation switch, the second isolation knife
Lock, third isolation switch, EBS, the first IDE_OBP and the 2nd IDE_OBP；Wherein, EBS is earthing pole line connection switch, IDE_
OBP is mutually to measure CT with grounding electrode electric current；It is connected with back two DC earthing polar circuits on described time two DC lines, described first
Isolation switch one end is in parallel with described time two direct current grounding pole circuit on one side, and the first isolation switch other end is through described second
Isolation switch is connected with third isolation switch one end；It the third isolation switch other end and is connected to and described returns a direct current
A direct current grounding pole circuit on one side parallel connection is returned on route；Between first isolation switch and second isolation switch
It is in series with the EBS, the 2nd IDE_OBP is provided between the EBS and second isolation switch；Positioned at described
The first IDE_OBP is provided between third isolation switch and a described time DC line.
It is further, in parallel between second isolation switch and the third isolation switch that there are two ground branch；It is described
It is provided with grounding switch in two ground branch, described grounding switch one end is connected to second isolation switch and described the
On earthing pole connecting line between three isolation switch, the grounding switch other end ground connection.
Further, a described time direct current grounding pole circuit connects by ground electrode circuit with two DC earthing polar circuits are returned
Ground.
A kind of bipolar neutral conductor differential protection method of operating when mutual based on above-mentioned wiring construction is with earthing pole comprising
Following steps: 1) when EBS switch is in coincidence, twice direct currents are mutually to use earthing pole state；When EBS switch is in quartile,
Twice direct currents are earthing pole independent operating state；2) when twice direct currents mutually use earthing pole, IDE_OBP is included in twice direct currents
In the criterion of bipolar neutral conductor differential protection；3) when mutually using earthing pole, if certain returns the movement of DC bipolar neutral conductor differential protection,
It is given while this time direct current execution protection act and mutually uses another time direct current sending action signal of earthing pole, and is judged whether
For bipolar operation；4) if protection still acts, whether the not available direct current of locking grounding electrode judges the available direct current of earthing pole
For bipolar operation, and pull open EBS；5) if protection still acts, the available direct current of locking grounding electrode；6) when twice direct currents restore
When earthing pole independent operating, the criterion of bipolar neutral conductor differential protection no longer adopts IDE_OBP, and action policy reverts to independence
Strategy when operation.
Further, in the step 3), if judging whether it is bipolar operation the following steps are included: 3.1) the bipolar neutral conductor
It is bipolar operation that differential protection, which acts back, then executes pole balance；If monopolar operation, then executes phase shift and restart；If 3.2) and its
It is mutually bipolar operation with another time direct current of earthing pole, then sends pole balancing command to another time direct current；If with it mutually with ground connection
Another time direct current of pole is monopolar operation, then sends phase shift reset command.
Further, in the step 4), judge whether the available direct current of earthing pole is bipolar operation, comprising the following steps:
4.1) if the available direct current of earthing pole is that bipolar operation directly pulls open EBS after the not available direct current locking of earthing pole；And
This judges whether protection still acts, and is that then the available direct current of locking grounding electrode, the available direct current of on the contrary then earthing pole are normally transported
Row；4.2) if the available direct current of earthing pole is monopolar operation, after the not available direct current locking of earthing pole, earthing pole is available straight
Stream executes phase shift order, and the electric current of EBS to be passed through pulls open EBS after being less than preset definite value again.
The invention adopts the above technical scheme, which has the following advantages: 1, mutual use earthing pole wiring knot of the invention
The earthing pole that twice direct currents may be implemented in structure is mutually used, and when earthing pole is unavailable, the earthing pole for borrowing another time direct current is normally defeated
Electricity improves the economic benefit of direct current transportation.2, bipolar neutral conductor differential protection range of the invention covers double back earthing pole
Connecting line region ensure that protection without dead zone, it is ensured that when double back direct current mutually uses earthing pole so that related protection zone overlaps each other
Safe and reliable operation.3, Preservation tactics flexibility and reliability of the invention ensure that non-event while removing and isolated fault as far as possible
The normal operation for hindering back direct current system improves the reliability of DC operation.
Detailed description of the invention
Fig. 1 is twice DC engineering main electrical scheme schematic diagrames for mutually using earthing pole；
Fig. 2 is that double back direct current of the present invention mutually uses earthing pole wiring schematic diagram；
Fig. 3 be it is of the invention mutually with earthing pole when bipolar neutral conductor differential protection motion flow schematic diagram.
Specific embodiment
The present invention is described in detail below with reference to the accompanying drawings and embodiments.
As shown in Fig. 2, the present invention provides a kind of mutual earthing pole wiring construction, a direct current and time two direct currents are being returned in setting
Between earthing pole connecting line on comprising the first isolation switch Q31, the second isolation switch Q32, third isolation switch Q33, connect
Earth polar line connection switch (EBS), the first IDE_OBP (return the mutual of a direct current and measure CT with grounding electrode electric current) and the 2nd IDE_OBP
(return the mutual of two direct currents and measure CT with grounding electrode electric current).
It returns on two DC lines and is connected with back two DC earthing polar circuits, first one end isolation switch Q31 and time two direct currents
Earthing pole circuit on one side is in parallel, and the first isolation switch Q31 other end is through the second isolation switch Q32 and third isolation switch Q33 mono-
End series connection.33 other end of third isolation switch and time direct current grounding pole circuit on one side being connected to back on a DC line are simultaneously
Connection.EBS switch is in series between the first isolation switch Q31 and the second isolation switch Q32；Positioned at EBS and the second isolation knife
The 2nd IDE_OBP is provided between lock Q32；The first IDE_ is provided between third isolation switch 33 and a time DC line
OBP。
In above-described embodiment, in parallel between the second isolation switch Q32 and third isolation switch Q33 there are two ground connection branch
Road.Grounding switch is provided in two ground branch, grounding switch one end is connected to the second isolation switch Q32 and is isolated with third
On earthing pole connecting line between disconnecting link Q33, grounding switch other end ground connection.
In the various embodiments described above, a time direct current grounding pole circuit is identical as two DC earthing polar circuits are returned, by ground connection
Pole line-to-ground.
To sum up, it is of the invention it is mutual with earthing pole wiring construction in use, when the first isolation switch on earthing pole connecting line
Q31, the second isolation switch Q32, third isolation switch Q33, EBS switch are closed state, and grounding switch is in an open state, and is mutually used
Ground connection extremely connection status, fault ground extremely isolation when, then it is assumed that double back direct current be mutually use earthing pole state.
As shown in figure 3, being based on above-mentioned wiring construction, mutually use bipolar neutral conductor when earthing pole poor the present invention also provides a kind of
Dynamic protection act method, comprising the following steps:
1) when EBS switch is in coincidence, twice direct currents are mutually to use earthing pole state；When EBS switch is in quartile, two
Returning direct current is earthing pole independent operating state；
2) when twice direct currents mutually use earthing pole, IDE_OBP is included in the bipolar neutral conductor differential protection of twice direct currents
In criterion；
3) when mutually using earthing pole, if certain returns the movement of DC bipolar neutral conductor differential protection, it is dynamic that this time direct current executes protection
As while give it and mutually use another time direct current sending action signal of earthing pole, and judge whether it is bipolar operation；
If 4) protection still act, the not available direct current of locking grounding electrode, judge the available direct current of earthing pole whether be
Bipolar operation, and pull open EBS；
5) if protection still acts, the available direct current of locking grounding electrode；
6) when twice direct currents restore earthing pole independent operating, the criterion of bipolar neutral conductor differential protection no longer adopts IDE_
OBP, action policy revert to strategy when independent operating.
Above-mentioned steps 3) in, judge whether it is it is bipolar operation the following steps are included:
If 3.1) it is bipolar operation that the bipolar neutral conductor differential protection, which acts back, pole balance is executed；If monopolar operation,
Phase shift is then executed to restart；
If 3.2) mutually using another time direct current of earthing pole with it is bipolar operation, pole balance life is sent to another time direct current
It enables；If being mutually monopolar operation with another time direct current of earthing pole with it, phase shift reset command is sent.
Above-mentioned steps 4) in, judge the available direct current of earthing pole whether be it is bipolar operation the following steps are included:
4.1) if the available direct current of earthing pole is that bipolar operation is directly pulled open after the not available direct current locking of earthing pole
EBS；And judge whether protection still acts herein, it is that then the available direct current of locking grounding electrode, on the contrary then earthing pole are available straight
Stream operates normally；
4.2) if the available direct current of earthing pole is monopolar operation, after the not available direct current locking of earthing pole, earthing pole can
Direct current executes phase shift order, and the electric current of EBS to be passed through pulls open EBS after being less than preset definite value again.
The various embodiments described above are merely to illustrate the present invention, and structure, setting position and the step of each component are all can be
Variation, based on the technical solution of the present invention, improvement that all principles according to the present invention carry out individual part and step and
Equivalents should not exclude except protection scope of the present invention.
Claims (6)
1. a kind of mutually uses earthing pole wiring construction, a direct current is set back and is returned on the earthing pole connecting line between two direct currents,
It is characterized by comprising the first isolation switch, the second isolation switch, third isolation switch, EBS, the first IDE_OBP and second
IDE_OBP；Wherein, EBS is earthing pole line connection switch, and IDE_OBP is mutually to measure CT with grounding electrode electric current；
Be connected with back two DC earthing polar circuits on described time two DC lines, first isolation switch one end with described time two
Direct current grounding pole circuit on one side is in parallel, and the first isolation switch other end is isolated through second isolation switch with the third
The series connection of disconnecting link one end；The third isolation switch other end returns a direct current grounding pole with described return on a DC line is connected to
Circuit on one side is in parallel；It is in series with the EBS between first isolation switch and second isolation switch, is located at described
The 2nd IDE_OBP is provided between EBS and second isolation switch；Positioned at the third isolation switch and described time one
The first IDE_OBP is provided between DC line.
2. wiring construction as described in claim 1, it is characterised in that: second isolation switch and the third isolation switch it
Between in parallel there are two ground branch；Grounding switch, grounding switch one end connection are provided in described two ground branch
To the earthing pole connecting line between second isolation switch and the third isolation switch, another termination of grounding switch
Ground.
3. wiring construction as claimed in claim 1 or 2, it is characterised in that: a described time direct current grounding pole circuit and time two direct currents
Ground connection polar circuit passes through ground electrode circuit ground connection.
4. it is a kind of based on as described in any one of claims 1 to 3 wiring construction it is mutual with earthing pole when the bipolar neutral conductor it is differential
Protection act method, it is characterised in that the following steps are included:
1) when EBS switch is in coincidence, twice direct currents are mutually to use earthing pole state；When EBS switch is in quartile, twice straight
Stream is earthing pole independent operating state；
2) when twice direct currents mutually use earthing pole, IDE_OBP is included in the criterion of the bipolar neutral conductor differential protection of twice direct currents
In；
3) when mutually using earthing pole, if certain returns the movement of DC bipolar neutral conductor differential protection, this time direct current executes protection act
Giving it mutually uses another time direct current sending action signal of earthing pole simultaneously, and judges whether it is bipolar operation；
4) if protection still acts, the not available direct current of locking grounding electrode judges whether the available direct current of earthing pole is bipolar
Operation, and pull open EBS；
5) if protection still acts, the available direct current of locking grounding electrode；
6) when twice direct currents restore earthing pole independent operating, the criterion of bipolar neutral conductor differential protection no longer adopts IDE_OBP,
Its action policy reverts to strategy when independent operating.
5. method as claimed in claim 4, it is characterised in that: in the step 3), it includes following for judging whether it is bipolar operation
Step:
If 3.1) it is bipolar operation that the bipolar neutral conductor differential protection, which acts back, pole balance is executed；If monopolar operation, then hold
Row phase shift is restarted；
If 3.2) mutually using another time direct current of earthing pole with it is bipolar operation, pole balancing command is sent to another time direct current；
If being mutually monopolar operation with another time direct current of earthing pole with it, phase shift reset command is sent.
6. method as claimed in claim 4, it is characterised in that: in the step 4), judge the available direct current of earthing pole whether be
Bipolar operation, comprising the following steps:
4.1) if the available direct current of earthing pole is that bipolar operation directly pulls open EBS after the not available direct current locking of earthing pole；
And judge whether protection still acts herein, it is the then available direct current of locking grounding electrode, the available direct current of on the contrary then earthing pole is just
Often operation；
4.2) if the available direct current of earthing pole is monopolar operation, after the not available direct current locking of earthing pole, earthing pole is available
Direct current executes phase shift order, and the electric current of EBS to be passed through pulls open EBS after being less than preset definite value again.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811391312.4A CN109301801B (en) | 2018-11-21 | 2018-11-21 | Mutual grounding electrode wiring structure and bipolar neutral line differential protection action method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811391312.4A CN109301801B (en) | 2018-11-21 | 2018-11-21 | Mutual grounding electrode wiring structure and bipolar neutral line differential protection action method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109301801A true CN109301801A (en) | 2019-02-01 |
| CN109301801B CN109301801B (en) | 2023-09-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811391312.4A Active CN109301801B (en) | 2018-11-21 | 2018-11-21 | Mutual grounding electrode wiring structure and bipolar neutral line differential protection action method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110120653A (en) * | 2019-04-30 | 2019-08-13 | 天津大学 | A kind of vertical traveling-wave differential protection method suitable for symmetrical bipolar DC link |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204230894U (en) * | 2014-10-24 | 2015-03-25 | 中国南方电网有限责任公司超高压输电公司广州局 | A kind of One Common Earthing Electrode operation interlock circuit |
| CN205283127U (en) * | 2015-11-13 | 2016-06-01 | 南方电网科学研究院有限责任公司 | Topological structure of many times high voltage direct current sharing earthing poles |
| CN105790211A (en) * | 2015-12-31 | 2016-07-20 | 国家电网公司 | Method for protecting earth electrode line |
| CN106385010A (en) * | 2016-09-09 | 2017-02-08 | 南京南瑞继保工程技术有限公司 | Ultra-high voltage direct current earth electrode earth electrode lead double end unbalance protection method |
| CN106385047A (en) * | 2016-11-18 | 2017-02-08 | 中国能源建设集团广东省电力设计研究院有限公司 | Full-bridge topological bipolar wiring flexible DC converter station and neutral line wiring apparatus thereof |
-
2018
- 2018-11-21 CN CN201811391312.4A patent/CN109301801B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204230894U (en) * | 2014-10-24 | 2015-03-25 | 中国南方电网有限责任公司超高压输电公司广州局 | A kind of One Common Earthing Electrode operation interlock circuit |
| CN205283127U (en) * | 2015-11-13 | 2016-06-01 | 南方电网科学研究院有限责任公司 | Topological structure of many times high voltage direct current sharing earthing poles |
| CN105790211A (en) * | 2015-12-31 | 2016-07-20 | 国家电网公司 | Method for protecting earth electrode line |
| CN106385010A (en) * | 2016-09-09 | 2017-02-08 | 南京南瑞继保工程技术有限公司 | Ultra-high voltage direct current earth electrode earth electrode lead double end unbalance protection method |
| CN106385047A (en) * | 2016-11-18 | 2017-02-08 | 中国能源建设集团广东省电力设计研究院有限公司 | Full-bridge topological bipolar wiring flexible DC converter station and neutral line wiring apparatus thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110120653A (en) * | 2019-04-30 | 2019-08-13 | 天津大学 | A kind of vertical traveling-wave differential protection method suitable for symmetrical bipolar DC link |
| CN110120653B (en) * | 2019-04-30 | 2021-03-23 | 天津大学 | Pilot traveling wave differential protection method suitable for symmetrical bipolar direct current line |
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| Publication number | Publication date |
|---|---|
| CN109301801B (en) | 2023-09-29 |
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