CN106532659B - A kind of parallel-connection structure extra-high voltage direct-current engineering direct current change-over switch controls guard method - Google Patents
A kind of parallel-connection structure extra-high voltage direct-current engineering direct current change-over switch controls guard method Download PDFInfo
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- CN106532659B CN106532659B CN201611159846.5A CN201611159846A CN106532659B CN 106532659 B CN106532659 B CN 106532659B CN 201611159846 A CN201611159846 A CN 201611159846A CN 106532659 B CN106532659 B CN 106532659B
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Classifications
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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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—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 for distribution gear, e.g. bus-bar systems; for switching devices for switches
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Abstract
The present invention relates to a kind of parallel-connection structure extra-high voltage direct-current engineering direct current change-over switches to control guard method, step：Judge loop state according to two fracture information of direct current change-over switch；When performing direct current change-over switch sub-switching operation, Control protection system sends out the separating brake order of auxiliary fracture first, is receiving point position state of auxiliary fracture and after preset delay, is sending out the separating brake order of main fracture；If not receiving auxiliary fracture point position state or a point position state duration being unsatisfactory for presetting delay, sequential control is automatically stopped；When performing direct current change-over switch closing operation, Control protection system sends out main fracture combined floodgate order first, in the conjunction position state for receiving main fracture and after preset delay, sends out the combined floodgate order of auxiliary fracture；If not receiving, main fracture closes position state or conjunction position state duration is unsatisfactory for presetting delay, and sequential control is automatically stopped.The present invention can be widely used in the control and protection of extra-high voltage direct-current engineering direct current change-over switch.
Description
Technical field
The present invention relates to a kind of direct current change-over switches to control guard method, especially with regard to a kind of extra-high straightening of parallel-connection structure
Flow the control guard method of engineering direct current change-over switch.
Background technology
In extra-high voltage direct-current engineering, to realize Ground return operation and the conversion of the metallic return method of operation, earthing pole
The conversion of earthing mode and the transfer of fault current in ground connection and station are configured with metallic return change-over switch, big in current conversion station
Earthing switch in earthed return change-over switch, neutral switch and station, direct current change-over switch use double-fracture series system.According to straight
The difference of position and effect of the change-over switch in major loop is flowed, DC control and protection system is configured with control adaptable therewith
Defencive function processed, in sequential control and relay protective scheme double-fracture cascaded structure direct current change-over switch by single break carry out control and
Protection, two fractures of series connection realize synchronization action by change-over switch.
It is extra-high voltage direct-current Project Realization voltage class, defeated with the continuous development of scientific and technological level and equipment manufacturing technology
Double promotions of capacity are sent, project under construction voltage is promoted to ± 1100kV by ± 800kV, and rated current is promoted to by 5000A
6250A.Due to the promotion of rated current, double-fracture cascaded structure direct current change-over switch can not meet wanting for direct current through-current capability
It asks, therefore, rated capacity 10000MW extra-high voltage direct-current engineerings have used the direct current change-over switch of parallel-connection structure, using three fractures
Series connection again and a single break or single break again and the structure of a single break, three fractures or single break are main fracture, fracture in parallel
To assist fracture.
Since direct current change-over switch employs parallel-connection structure, will be unable to that its control protection work(is configured according to single break switch
Can, existing direct current change-over switch control and protection method is no longer applicable in, it is necessary to be considered new with direct current change-over switch arrangement phase
The control guard method of adaptation.
As shown in Figure 1 and Figure 2, prior art extra-high voltage direct-current engineering uses double 12 pulse conversion devices series wiring modes,
It is made of converting plant, DC line and Inverter Station, capital equipment includes transverter, converter power transformer, smoothing reactor and direct current
The equipment such as change-over switch.Extra-high voltage direct-current engineering direct current change-over switch mainly has metallic return change-over switch (MRTB), the earth to return
Line change-over switch (GRTS), neutral switch (NBS), stand in earthing switch (NBGS), wherein metallic return change-over switch and big
Earthed return change-over switch is only configured in converting plant.
As shown in Figure 3, Figure 4, the direct current change-over switch generally use double-fracture series system of non-parallel-connection structure is controlled in sequence
Double-fracture cascaded structure direct current change-over switch is controlled and is protected by single break in system and relay protective scheme, two fractures of series connection
Synchronization action is realized by change-over switch.The direct current change-over switch of parallel-connection structure, using the series connection of three fractures again and a single break or list
Fracture is again and the structure of a single break, three fractures or single break are main fracture, and fracture in parallel is auxiliary fracture.
Invention content
In view of the above-mentioned problems, the object of the present invention is to provide a kind of parallel-connection structure extra-high voltage direct-current engineering direct current change-over switches
Guard method is controlled, the contradiction that may occur simultaneously is overlapped with protection which obviate control system separating brake, has ensured switch motion
Independence and operational safety.
To achieve the above object, the present invention takes following technical scheme：A kind of parallel-connection structure extra-high voltage direct-current engineering direct current
Change-over switch controls guard method, it is characterised in that includes the following steps：1) sentenced according to two fracture information of direct current change-over switch
Disconnected loop state；2) when performing direct current change-over switch sub-switching operation, Control protection system sends out the separating brake of auxiliary fracture first
Order is receiving point position state of auxiliary fracture and after preset delay, is sending out the separating brake order of main fracture；If it does not receive
It is unsatisfactory for presetting delay to auxiliary fracture point position state or a point position state duration, then sequential control is automatically stopped；3)
When performing direct current change-over switch closing operation, Control protection system sends out main fracture combined floodgate order first, is receiving main fracture
Conjunction position state and after preset delay, send out auxiliary fracture combined floodgate order；If not receiving main fracture closes position state
Or close position state duration and be unsatisfactory for presetting delay, then sequential control is automatically stopped；4) DC operation electric current is more than to appoint
During the electric current tolerance of one fracture, direct current change-over switch overcurrent protection alert simultaneously sends out automatic drop power command；
5) in the direct current protecting of triple modular redundant during the equal failure of main fracture loop current mutual inductor, current transformer correlation protection work(is exited
Can, and forbid carrying out the conversion operation of direct current change-over switch；6) when only having main fracture conjunction position, Control protection system carries out direct current and turns
Change the comparison of switching circuitry electric current and main fracture loop current, alert when current differential is more than definite value.
In the step 1)：When existing control system judges the mode of connection, break when main fracture and with the auxiliary of main fracture simultaneously
Mouthful any one be in close position when, then judge circuit for connection status；When two fractures are point position, judge circuit to disconnect shape
State.
In the step 2), if auxiliary fracture separating brake failure, treated that direct current turns according to filtered for direct current protecting
It changes switching circuitry electric current and the difference triggering direct current change-over switch of filtered treated main fracture electric current is protected, protection act hair
Go out to overlap auxiliary fracture order.
In the step 2), if main fracture separating brake fails, direct current protecting is according to the main fracture electric current after filtering process
It triggers the protection of direct current change-over switch quick fraction or treated that direct current change-over switch loop current triggering direct current turns according to filtered
Changing switch, section is protected at a slow speed, and protection act sends out main fracture and overlaps order, and auxiliary fracture is sent out after the delay being set and is overlapped
Order.
The present invention has the following advantages due to taking above technical scheme：1st, the present invention is in direct current change-over switch separating brake
During with closing operation, control system sends separating brake and closes a floodgate and orders respectively to main fracture and auxiliary fracture, and control sequence is clear and definite, point
It is set in lock and making process by rational logic, avoids control system separating brake and overlap the lance that may occur simultaneously with protection
Shield has ensured the independence of switch motion.2nd, the present invention by main fracture and assists fracture overcurrent, the event of main fracture current transformer
The functions such as barrier, arrester and parallel oscillation loop inner fault monitoring are unified in the control protection of direct current change-over switch to be realized, control
Protection system processed can carry out real-time judge, therefore can be with the fortune of full-scope safeguards direct current change-over switch to the information of direct current change-over switch
Row safety.It present invention can be widely used in the control and protection of extra-high voltage direct-current engineering direct current change-over switch.
Description of the drawings
Fig. 1 is extra-high voltage direct-current engineering main electrical scheme schematic diagram in the prior art；
Fig. 2 is position view of the direct current change-over switch in extra-high voltage direct-current engineering in the prior art；
Fig. 3 is non-parallel-connection structure direct current change-over switch schematic diagram in the prior art；
Fig. 4 is the direct current change-over switch schematic diagram for having in the prior art parallel-connection structure；
Fig. 5 is direct current change-over switch separating brake process time diagram of the present invention；
Fig. 6 is direct current change-over switch making process time diagram of the present invention.
Specific embodiment
The extra-high voltage direct-current engineering direct current change-over switch control guard method of the parallel-connection structure of the present invention is by " main fracture and simultaneously
Connection auxiliary fracture " two parts carry out control defencive function design, the present invention are carried out with reference to the accompanying drawings and examples detailed
Description.
As shown in Figure 5, Figure 6, the present invention provides a kind of parallel-connection structure extra-high voltage direct-current engineering direct current change-over switch control and protects
Maintaining method includes the following steps：
1) judge loop state according to two fracture information of direct current change-over switch；
When existing control system judges the mode of connection, when main fracture and with the auxiliary fracture of main fracture simultaneously, any one is in conjunction
During position, then judge circuit for connection status；When two fractures are point position, judge circuit for off-state；
2) when performing direct current change-over switch sub-switching operation, Control protection system sends out the separating brake life of auxiliary fracture first
It enables, is receiving point position state of auxiliary fracture and after preset delay, sending out the separating brake order of main fracture；If it does not receive
Auxiliary fracture point position state or a point position state duration are unsatisfactory for presetting delay, then sequential control is automatically stopped；
If 2.1) auxiliary fracture separating brake failure, direct current protecting is according to filtered treated direct current change-over switch circuit
The difference triggering direct current change-over switch of electric current and filtered treated main fracture electric current is protected, and protection act sends out coincidence auxiliary
Fracture order；
If 2.2) main fracture separating brake fails, direct current protecting turns according to the main fracture current trigger direct current after filtering process
Change the protection of switch quick fraction or according to filtered treated direct current change-over switch loop current triggering direct current change-over switch at a slow speed
Section protection, protection act send out main fracture and overlap order, and auxiliary fracture is sent out after the delay being set and overlaps order；
3) when performing direct current change-over switch closing operation, Control protection system sends out main fracture combined floodgate order first,
It receives the conjunction position state of main fracture and after preset delay, sends out the combined floodgate order of auxiliary fracture；If it does not receive main disconnected
Mouth closes position state or closes position state duration and is unsatisfactory for presetting delay, then sequential control is automatically stopped；
4) when DC operation electric current is more than the electric current tolerance of any fracture, direct current change-over switch overcurrent protection sends out report
Alert information simultaneously sends out automatic drop power command；
5) in the direct current protecting of triple modular redundant during the equal failure of main fracture loop current mutual inductor, current transformer correlation is exited
Defencive function, and forbid carrying out the conversion operation of direct current change-over switch；
6) it is monitoring arrester circuit and the short trouble of parallel oscillation loop inner, when only main fracture closes position, control
Protection system carries out the comparison of direct current change-over switch loop current and main fracture loop current, and current differential is sent out when being more than definite value
Warning message.
The various embodiments described above are merely to illustrate the present invention, and structure and size, installation position and the shape of each component are all can be with
It is varied from, on the basis of technical solution of the present invention, all improvement carried out according to the principle of the invention to individual part and waits
With transformation, should not exclude except protection scope of the present invention.
Claims (4)
1. a kind of parallel-connection structure extra-high voltage direct-current engineering direct current change-over switch controls guard method, it is characterised in that including following step
Suddenly：
1) judge loop state according to two fracture information of direct current change-over switch；
2) when performing direct current change-over switch sub-switching operation, Control protection system sends out the separating brake order of auxiliary fracture first,
It receives point position state of auxiliary fracture and after preset delay, sends out the separating brake order of main fracture；If auxiliary is not received
Fracture point position state or a point position state duration are unsatisfactory for presetting delay, then sequential control is automatically stopped；
3) when performing direct current change-over switch closing operation, Control protection system sends out main fracture combined floodgate order first, is receiving
The conjunction position state of main fracture and after preset delay sends out the combined floodgate order of auxiliary fracture；If main fracture conjunction is not received
Position state or conjunction position state duration are unsatisfactory for presetting delay, then sequential control is automatically stopped；
4) when DC operation electric current is more than the electric current tolerance of any fracture, direct current change-over switch overcurrent protection sends out alarm signal
It ceases and sends out automatic drop power command；
5) in the direct current protecting of triple modular redundant during the equal failure of main fracture loop current mutual inductor, current transformer correlation protection is exited
Function, and forbid carrying out the conversion operation of direct current change-over switch；
6) when only having main fracture and closing position, Control protection system carries out direct current change-over switch loop current and main fracture loop current
Compare, alert when current differential is more than definite value.
2. a kind of parallel-connection structure extra-high voltage direct-current engineering direct current change-over switch control guard method as described in claim 1,
It is characterized in that：In the step 1)：When existing control system judges the mode of connection, break when main fracture and with the auxiliary of main fracture simultaneously
Mouthful any one be in close position when, then judge circuit for connection status；When two fractures are point position, judge circuit to disconnect shape
State.
3. a kind of parallel-connection structure extra-high voltage direct-current engineering direct current change-over switch control guard method as described in claim 1,
It is characterized in that：In the step 2), if auxiliary fracture separating brake failure, treated that direct current turns according to filtered for direct current protecting
It changes switching circuitry electric current and the difference triggering direct current change-over switch of filtered treated main fracture electric current is protected, protection act hair
Go out to overlap auxiliary fracture order.
4. a kind of parallel-connection structure extra-high voltage direct-current engineering direct current change-over switch control guard method as described in claim 1,
It is characterized in that：In the step 2), if main fracture separating brake fails, direct current protecting is according to the main fracture electric current after filtering process
It triggers the protection of direct current change-over switch quick fraction or treated that direct current change-over switch loop current triggering direct current turns according to filtered
Changing switch, section is protected at a slow speed, and protection act sends out main fracture and overlaps order, and auxiliary fracture is sent out after the delay being set and is overlapped
Order.
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| CN107769240B (en) * | 2017-10-27 | 2019-12-03 | 南方电网科学研究院有限责任公司 | The control method and device of direct current change-over switch |
| CN110896225B (en) * | 2019-11-29 | 2021-08-03 | 南方电网科学研究院有限责任公司 | Method and device for online putting third station of multi-terminal conventional direct-current power transmission system into operation and storage medium |
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| JP2011041427A (en) * | 2009-08-18 | 2011-02-24 | Nissin Electric Co Ltd | Power unit for uninterruptible power work |
| EP2523204B1 (en) * | 2011-05-12 | 2019-09-04 | ABB Schweiz AG | Circuit arrangement and method for interrupting a current flow in a DC current path |
| WO2015062644A1 (en) * | 2013-10-30 | 2015-05-07 | Abb Technology Ltd | Circuit breaker |
| CN204597623U (en) * | 2015-05-14 | 2015-08-26 | 贵州大学 | A kind of solid converting switch |
| CN205283110U (en) * | 2016-01-04 | 2016-06-01 | Abb技术有限公司 | Direct current change over switch |
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