CN109256861A - A kind of station domain failure protection system and method that more DC grid failures quickly isolate - Google Patents
A kind of station domain failure protection system and method that more DC grid failures quickly isolate Download PDFInfo
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- CN109256861A CN109256861A CN201811238822.8A CN201811238822A CN109256861A CN 109256861 A CN109256861 A CN 109256861A CN 201811238822 A CN201811238822 A CN 201811238822A CN 109256861 A CN109256861 A CN 109256861A
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Classifications
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- H02J13/0003—
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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
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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
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
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Abstract
The invention discloses a kind of station domain failure protection system and method that more DC grid failures quickly isolate; the Fault Isolation time can be foreshortened in 200ms by traditional 400ms; transient state energy impacts during reducing electric network fault; direct-current commutation failure risk caused by disturbing due to AC fault is reduced, power network safety operation level is greatly improved.The station domain failure protection system of proposition, by the layered configuration scheme of main website and substation, it can be achieved that whole station voltage, electric current and circuit breaker position data acquisition.Information exchange can be carried out between different main websites, realized the information exchanges such as associated substation breakers position, current data, route protection movement, expanded the sensing range of station domain failure protection system.By the differential ring design scheme for domain failure protection of standing, traditional failure protection criterion is substituted, realizes the quick identification and isolation of failure fault and dead-zone fault.
Description
Technical field
The present invention relates to a kind of station domain failure protection systems and scheme that more DC grid failures quickly isolate, and belong to electric power
System relay protection field.
Background technique
Extra-high voltage grid is built the transitional period, and power grid " tetanic weak friendship " feature is prominent, and the new energy equipment such as wind-powered electricity generation, photovoltaic is grid-connected
Capacity sustainable growth, power grid pattern and the great change of power supply architecture generation, the means of identification formed based on conventional AC system are prevented
Imperial theory, control technology have lagged behind extra-high voltage alternating current-direct current operation of power networks practice.It is domestic in recent years in succession generation repeatedly by
In fault in ac transmission system, cause the event of direct current system commutation failure.Alternating voltage amplitude falls caused by AC network failure
It falls, the distortion of waveform, causes change of current busbar voltage and fall and distort, small disturbance may be carried out power and put by direct current system
Greatly, and sending it is conducted between receiving end.
After short trouble occurs for AC system, failure, failure can not quickly may be cut off due to breaker breaker failure
Duration is elongated, increases the continuous commutation failure of direct current or direct current is latched risk, easily cause extensive power oscillation, the big model of trend
Transfer is enclosed, may cause other cascading failures, consequence is extremely serious.Extra-high voltage alternating current-direct current serial-parallel power grid occurs direct current reversing and loses
It loses, the power swing of power grid 200ms or so can be caused, cause a wide range of power flow transfer of power grid.Traditional failure protection actuation time
About 400ms, the study limitation about failure protection are optimized in using AC system criterion, are had some limitations, no
The influence of CT hangover can thoroughly be solved, it is difficult to substantially shorten failure protection and cut off fault time, direct current during failure can not be solved
Consequential commutation failure cannot fully meet extra-high voltage alternating current-direct current power grid operation requirement.
Summary of the invention
In order to solve the above-mentioned technical problems, the present invention provides a kind of station domains realizing more DC grid failures and quickly isolating
Failure protection system and method, effectively shorten mute time of failure fault and dead-zone fault, reduce due to fault in ac transmission system
The risk of direct-current commutation failure and locking is caused, ensures bulk power grid operational safety,
To achieve the above object, the technical solution adopted by the present invention, specific as follows:
A kind of station domain failure protection system that more DC grid failures quickly isolate, including station level, wall and process
Layer, from top to bottom using main website, the layered configuration of substation, substation configuration realizes the acquisition of substation operation data in wall, main
Configuration stand in station level, whole station information and station domain failure protection movement outlet are obtained by substation.
Main website is based on substation and is configured, and substation is based on string and is configured；
Each substation configures a main website, and main website obtains information of voltage, current information, the breaker of whole station by substation
Status information and relay protection action message；It is communicated to connect between adjacent substations main website, main website obtains the information of adjacent substations；
Master station access time synchronism apparatus signal；
Substation includes string substation and transformer substation, and string substation is based on substation's string and is configured, and each substation's string is matched
Set a string substation；Transformer substation is based on transformer configuration, and a transformer substation is separately configured in each transformer；Substation connects
Angle of incidence synchronizing device signal；
String substation obtains operation information in substation's string, and the interior operation information of substation's string includes: real-time in substation's string
Current information, information of voltage, circuit breaker position information and route protection information；Transformer substation obtains three side information of transformer
(high, medium and low three side of three-circuit transformer), three side information of transformer include the current information of real-time three side of transformer, information of voltage,
Circuit breaker position information and main transformer protection action message；It is sent on after substation acquisition string three side information of interior operation information or transformer
Main website；
Main website obtains the information of the information and transformer substation sent on each string substation, receives bus protection action message, leads to
It crosses adjacent main website and obtains substation's phase connecting lines opposite side information and opposite side route protection action message.
A kind of station domain failure protection method that more DC grid failures quickly isolate, comprising the following steps:
Step 1: to main website, main website obtains complete for operation information and three side information of transformer in control sub-station Shang Song substation string
It stands information；
Step 2: adjacent main website exchange correlation line information, main website obtain universe information；
Step 3: according to grid collapses, main website is differential according to relay protection action message and position of the switch information architecture
Ring, carries out differential ring configuration, and relay protection issues action message；
Step 4: initiating station domain failure protection logic, according to the action message that relay protection issues, control sub-station blocks phase
Answer the current transformer of breaker；
Step 5: according to the information of block current transformer, main website starts differential ring Protection criteria；Differential ring Protection criteria
Substitute traditional failure protection criterion；
Step 6: domain failure protection of standing movement outlet, circuit breaker trip, differential ring difference current return.
Step 1 specifically includes the following steps:
(101), string substation obtains operation information in substation's string, and string substation gets the real time information in substation's string
Afterwards, processing is synchronized according to data markers；
(102), three side information of substation transformer is accessed in transformer substation, and transformer substation gets substation transformer
Real time information after, processing is synchronized according to data markers；
(103), it send in the real time information that string substation and transformer substation will acquire to main website, bus differential ring protection will be moved
Make information it is real-time on be sent to main website, main website gets whole station information；
(104), main website synchronizes processing to whole station information, main website obtains complete according to the timescale data in whole station information
Target whole station information when standing unified.
Step 2 specifically includes the following steps:
(201) real time information of adjacent main website exchange correlation route, main website get the reality of all breakers in substation
When information；
(202) processing is synchronized according to the timescale data in the real time information of adjacent main website exchange, main website gets tool
Target universe information when having unified.
Differential ring includes Line Differential ring and bus differential ring；Line Differential ring is that the electric current of the breaker around route is mutual
The minimum differential area that sensor (CT) is surrounded；Bus differential ring is is surrounded around the current transformer of the breaker of bus
Minimum differential area；Line Differential ring includes first line differential ring and the second Line Differential ring；First line differential ring is side
The minimum differential area that the current transformer of switch disconnector is surrounded；Second Line Differential ring is the electric current of middle switch disconnector
The minimum differential area that mutual inductor is surrounded.
Step 3 specifically includes the following steps:
(301), differential ring configuration is configured according to bus differential ring and Line Differential ring；
Bus differential ring is configured according to bus, one bus differential ring of a bus bar configuration；Non-failure conditions flow down
The vector current for entering bus differential ring is zero, after bus differential ring is for route protection movement, side malfunctioning switch tripping；
Line Differential ring is configured according to route, one Line Differential ring of a line configuring；Line Differential ring includes
The middle switch disconnector of the two sides substation of connection line and side switch disconnector flow into Line Differential ring under non-failure conditions
Vector current is zero；
(302) if line failure, route protection movement will after string substation receives route protection action message
It is sent in route protection action message to main website；
(303) if bus breaks down, bus differential ring protection movement sends bus differential ring protection action message
To main website.
Step 4 specifically includes the following steps:
(401) if bus differential ring protection acts, side switching dead failure occurs, substation receives side switch disconnector
Position is jumped, main website, which monitors side switch disconnector by substation, to be become jumping position from coincidence；The substation gone here and there where the switch disconnector of side receives
After jumping position to side switch disconnector, the current sensor of side switch block breaker side, substation uploads side switch disconnector side electricity
Flow sensor electric current is zero；
(402) after in case of bus differential ring protection movement, side switch disconnector failure refuses to jump, side switch disconnector institute
Breaker is not received in string substation and jumps position, and main website does not receive the side switch disconnector sent on substation and jumps position；
The switch disconnector failure when substation where switch disconnector judges, side switch disconnector are refused to jump；Substation is opened by side
Breaker is closed to refuse to send in jump result to main website；
Main website receives the side switch disconnector protection signal of bus differential protection, and it is disconnected to receive the side switch sent on substation
Road device is refused to jump signal；
Current transformer corresponding to the switch disconnector of side is blocked in substation, above send to the electric current of the side switch disconnector of main website
It is zero,
Stand domain failure protection main website building first line differential ring difference current, difference current is out-of-limit；
(403) after in case of route protection movement, side switch disconnector failure tripping；Main website receives side switch open circuit
Device, which is jumped, orders；
Current sensor corresponding to breaker is blocked in substation, and above sending the electric current to the breaker of main website is zero,
Stand domain failure protection main website building bus differential ring difference current, difference current is out-of-limit；
(404) after in case of route protection movement, middle switch disconnector failure tripping；Main website receives middle switch open circuit
Device, which is jumped, orders；
Current transformer corresponding to switch disconnector, above send to the electric current of the middle switch disconnector of main website in the block of substation
It is zero,
The stand main website of domain failure protection constructs the difference current of the second Line Differential ring, and difference current is out-of-limit.
Differential ring Protection criteria specifically includes the following steps:
Stand domain failure protection main website building differential ring difference current, difference current is out-of-limit, start rotating ring failure protect
Shield；Differential ring has y branch, and the electric current of each branch is IΦx(x=1,2...y), the failure protection routine ratio of the differential ring
The difference current of the differential starting element of example are as follows:
Wherein, Φ indicates any one phase of three-phase current A, B, C, IdΦFor difference current,For differential starting threshold value；
The Sudden Changing Rate difference current of the failure protection Sudden Changing Rate ratio differential starting element of the differential ring are as follows:
Wherein, Δ IdΦFor Sudden Changing Rate difference current,For the differential starting threshold value of Sudden Changing Rate, Δ IΦxFor branch current
Sudden Changing Rate；
It is to patrol between the differential starting element of failure protection conventional ratio and failure protection Sudden Changing Rate ratio differential starting element
Collect the relationship of "or"；
Difference current, stalling current and the differential starting threshold value of Sudden Changing Rate of the failure protection ratio differential element of differential ring
Are as follows:
Wherein, IrΦFor stalling current, IsetFor differential current threshold value,For difference current action value, KrFor conventional ratio
Rate restraint coefficient；
Difference current, the Sudden Changing Rate difference current of the failure protection Sudden Changing Rate ratio differential element of the differential ring are as follows:
Wherein, Kr' it is Sudden Changing Rate proportional brake coefficient；ΔIrΦFor Sudden Changing Rate difference current；
Failure protection ratio differential element and failure protection Sudden Changing Rate ratio differential element are the relationship of "or".
Beneficial effect of the present invention includes: that the present invention discloses a kind of station domain failure protection that more DC grid failures quickly isolate
System, by the layered configuration scheme of main website and substation, it can be achieved that whole station voltage, electric current and circuit breaker position data acquisition.No
With information exchange can be carried out between main website, the information such as associated substation breakers position, current data, route protection movement are realized
Interaction expands the sensing range of station domain failure protection system.By the differential ring design scheme for domain failure protection of standing, substitution is passed
The failure protection criterion of system realizes the quick identification and isolation of failure fault and dead-zone fault.
The invention proposes a kind of station domain failure protection methods realizing more DC grid failures and quickly isolating, and guarantee in electricity
After net generation dead-zone fault or when breaker failure tripping, fault clearing time can be foreshortened to 200ms or so by 400ms.
Due to using the application station domain failure protection system, method, when dead-zone fault or breaker tripping failure occur for direct current drop point near region,
Substantially accelerate failure removal speed.Low-voltage decreased duration during electric network fault, direct current occur repeatedly continuous commutation and lose
The probability lost reduces, and greatly reduces the power grid transient state energy impact caused by direct current, reduces power grid since transient state energy impacts
It is horizontal to improve extra-high voltage alternating current-direct current serial-parallel power grid safe and stable operation for the unstability risk of initiation.With Jiangsu Power Grid simulation analysis
As a result for, failure protection is acted after the line-breaker tripping of part, and after shortening fault clearing time, 3 continuous commutations occur
The direct current of failure, may only occur 2 continuous commutation failures, and system stability greatly improves.The present invention realizes dead-zone fault
It is quickly identified with the failure of breaker failure tripping, improves the failure removal speed of failure protection and dead-zone fault, improve
Electric power netting safe running is horizontal.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples；
Fig. 1 is a kind of station domain failure protection system structure signal realizing more DC grid failures and quickly isolating of the invention
Figure；
Fig. 2 is the configuration method of main website of the invention and substation；
Fig. 3 is a kind of station domain failure protection method flow diagram realizing more DC grid failures and quickly isolating of the present invention；
Fig. 4 is differential ring Protection criteria flow chart of the present invention；
The position Fig. 5 station domain failure protection logical flow chart of the invention.
Specific embodiment
The invention will be further described with reference to the accompanying drawing and by specific embodiment, and following embodiment is descriptive
, it is not restrictive, this does not limit the scope of protection of the present invention.
In order to make technological means of the invention, creation characteristic, workflow, application method reach purpose and effect, and it is
It is easy to understand the evaluation method with reference to specific embodiments the present invention is further explained.
The invention will be further described with reference to the accompanying drawings and in conjunction with example.
As shown in Figure 1, a kind of station domain failure protection system that more DC grid failures quickly isolate, including station level,
Interlayer and process layer, from top to bottom using main website, the layered configuration of substation, substation configuration realizes substation operation in wall
Data acquisition, main website configuration obtain whole station information and station domain failure protection movement outlet in station level, by substation.
Zhan Yu failure protection main website will station domain failure protection action message by MMS communication (IEC-61850 message specification)
It is sent to SCADA system (data acquisition and supervisor control-Supervisory Control And Data
Acquisition)。
It is configured as shown in Fig. 2, main website is based on substation, substation is based on string and is configured；
Each substation configures a main website, and main website obtains information of voltage, current information, the breaker of whole station by substation
Status information and relay protection action message；It is communicated to connect between adjacent substations main website, main website obtains the information of adjacent substations；
Master station access time synchronism apparatus signal, has data synchronizing capacity.
Substation includes string substation and transformer substation, and string substation is based on substation's string and is configured, and each substation's string is matched
Set a string substation；Transformer substation is based on transformer configuration, and a transformer substation is separately configured in each transformer；Substation connects
Angle of incidence synchronizing device signal, has data synchronizing capacity.
Go here and there substation obtain substation go here and there in operation information, comprising: substation string in real-time current information, information of voltage,
Circuit breaker position information and route protection information；Transformer substation obtains three side information of transformer, and (three-circuit transformer is high, medium and low
Three sides), three side information of transformer includes current information, information of voltage, circuit breaker position information and the master of real-time three side of transformer
Become protection act information；Main website is sent on after substation acquisition string three side information of interior operation information or transformer.
Main website obtains the information of the information and transformer substation sent on each string substation, receives bus protection action message, leads to
It crosses adjacent main website and obtains substation's phase connecting lines opposite side information and opposite side route protection action message.
As shown in figure 3, a kind of station domain failure protection method that more DC grid failures quickly isolate, comprising the following steps:
Step 1: to main website, main website obtains complete for operation information and three side information of transformer in control sub-station Shang Song substation string
It stands information；
Step 2: adjacent main website exchange correlation line information, main website obtain universe information；
Step 3: according to grid collapses, main website is differential according to relay protection action message and position of the switch information architecture
Ring, carries out differential ring configuration, and relay protection issues action message；
Step 4: initiating station domain failure protection logic, according to the action message that relay protection issues, control sub-station blocks phase
Answer the current transformer of breaker；
Step 5: according to the information of block current transformer, main website starts differential ring Protection criteria；Differential ring Protection criteria
Substitute traditional failure protection criterion；
Step 6: domain failure protection of standing movement outlet, circuit breaker trip, differential ring difference current return.
Step 1 specifically includes the following steps:
(101), string substation obtains the interior operation information A of substation's string, and the change including substation's string is believed in operation in substation's string
Real-time current information, information of voltage, circuit breaker position information and route protection information in the string of power station；String substation gets power transformation
After the real time information of the different interval, equipment stood in string, processing is synchronized according to data markers；
(102), three side information of substation transformer is accessed in transformer substation, and three side information of transformer includes three side of transformer
Current information, information of voltage, circuit breaker position information and main transformer protection action message, transformer substation get substation change
After the real time information of the different interval, equipment of depressor, processing is synchronized according to data markers；
(103), it send in the real time information that string substation and transformer substation will acquire to main website, bus differential ring protection will be moved
Make information it is real-time on be sent to main website, main website gets whole station information；
(104), main website synchronizes processing to whole station information, main website obtains complete according to the timescale data in whole station information
Target whole station information when standing unified.
Step 2 specifically includes the following steps:
(201) real time information of adjacent main website exchange correlation route, line voltage distribution, current data including associated circuitry,
Route protection action message and line-breaker location information, main website get the real time information of all breakers in substation；
(202) processing is synchronized according to the timescale data in the real time information of adjacent main website exchange, main website gets tool
Target universe information when having unified.
As shown in figure 4, differential ring includes Line Differential ring and bus differential ring；Line Differential ring is the open circuit around route
The minimum differential area that the current transformer (CT) of device is surrounded；Bus differential ring is the Current Mutual Inductance of the breaker around bus
The minimum differential area that device is surrounded；Line Differential ring includes first line differential ring and the second Line Differential ring；First line
The minimum differential area that differential ring is surrounded by the current transformer of side switch disconnector；Second Line Differential ring is that middle switch is disconnected
The minimum differential area that the current transformer of road device is surrounded.
Step 3 specifically includes the following steps:
(301) differential ring configuration is configured according to bus differential ring and Line Differential ring, after relay protection movement occurs,
Main website starts differential ring action logic, calculates abort situation and failure protection actuating range, executes station domain failure by substation and protects
Action logic is protected, respective circuit breakers are disconnected, cuts off failure.
Bus differential ring is configured according to bus, one bus differential ring of a bus bar configuration；Bus differential ring includes
Current bus and its all branches, flowing into the vector current of bus differential ring under non-failure conditions is zero, and bus differential ring is used for
After route protection movement, side malfunctioning switch tripping.
Line Differential ring is configured according to route, one Line Differential ring of a line configuring；Line Differential ring includes
The middle switch of the two sides substation of connection line and side switch, and the vector current that Line Differential ring is flowed under non-failure conditions is
Zero.Line Differential ring refuses jump, side switching dead failure for bus protection movement back malfunctioning switch, or other one with string
Middle malfunctioning switch is refused to jump after route protection movement.
(302) if line failure, route protection movement will after string substation receives route protection action message
It is sent in route protection action message to main website；
(303) if bus breaks down, bus differential ring protection movement sends bus differential ring protection action message
To main website.
As shown in figure 5, step 4 specifically includes the following steps:
(401) if bus differential ring protection acts, side switching dead failure occurs, such as schemes F2 point and breaks down, substation
It receives side switch disconnector DL21 and jumps position, main website, which monitors side switch disconnector DL21 by substation, to be become jumping position from coincidence；Side
After the substation gone here and there where switch disconnector DL21 receives side switch disconnector DL21 jump position, the side switch block side breaker DL21
CT, substation upload the side side switch disconnector DL21 CT electric current be zero；
The failure protection of first line differential ring is handled by stabilization and time delays, and movement outlet is executed by substation
2 breaker of differential ring is jumped in failure protection movement, protection.
(402) after in case of bus differential ring protection movement, side switch disconnector DL21 failure refuses to jump, side switch open circuit
String substation where device DL21 does not receive breaker DL21 and jumps position, and main website does not receive the side switch disconnector DL21 sent on substation and jumps
Position；
The switch disconnector DL21 failure when substation where switch disconnector DL21 breaker judges, breaker are refused to jump；Son
It stands to refuse to jump in result by side switch disconnector DL21 and send to main website.
Main website receives the side switch disconnector DL21 protection signal of bus differential protection, receives the side sent on substation and opens
Breaker DL21 is closed to refuse to jump signal；
CT corresponding to side switch disconnector DL21 is blocked in substation, above send to the electric current of the side switch disconnector DL21 of main website
It is zero,
Stand domain failure protection main website building first line differential ring difference current, difference current is out-of-limit；
The failure protection of first line differential ring is handled by stabilization and time delays, and movement outlet is executed by substation
Failure protection movement, protects the first differential ring of jumping circuit (differential ring 2 in attached drawing 4) breaker.
(403) after in case of route protection movement, side switch disconnector DL21 failure tripping.Main website receives side switch
Breaker DL21, which is jumped, to be ordered；
CT corresponding to breaker DL21 is blocked in substation, and above sending the electric current to the breaker DL21 of main website is zero,
Stand domain failure protection main website building bus differential ring (4 differential ring 1 of attached drawing) difference current, difference current gets over
Limit starts the station domain failure protection logic of bus differential ring.
The failure protection of bus differential ring is handled by stabilization and time delays, and movement outlet executes failure by substation
Poor bus differential ring breaker is jumped in protection act, protection.
(404) after in case of route protection movement, middle switch disconnector DL22 failure tripping；Main website receives middle switch
Breaker DL22, which is jumped, to be ordered.
CT corresponding to switch disconnector DL22, above send to the electric current of the middle switch disconnector DL22 of main website in the block of substation
It is zero,
Stand domain failure protection main website building the second Line Differential ring (4 differential ring 3 of attached drawing) difference current, difference current
It is out-of-limit；
The failure protection of second Line Differential ring is handled by stabilization and time delays, and movement outlet is executed by substation
The second Line Differential ring breaker is jumped in failure protection movement, protection.
Differential ring Protection criteria specifically includes the following steps::
Stand domain failure protection main website building differential ring difference current, difference current is out-of-limit, start rotating ring failure protect
Shield；Differential ring has y branch, and the electric current of each branch is IΦx(x=1,2...y), the failure protection routine ratio of the differential ring
The difference current of the differential starting element of example are as follows:
Wherein, Φ indicates any one phase of three-phase current A, B, C, IdΦFor difference current,For differential starting threshold value；
The Sudden Changing Rate difference current of the failure protection Sudden Changing Rate ratio differential starting element of the differential ring are as follows:
Wherein, Δ IdΦFor Sudden Changing Rate difference current,For the differential starting threshold value of Sudden Changing Rate, Δ IΦxFor branch current
Sudden Changing Rate.
It is to patrol between the differential starting element of failure protection conventional ratio and failure protection Sudden Changing Rate ratio differential starting element
The relationship of "or" is collected, as long as any starting element starts, broadens 500ms automatically.
Difference current, stalling current and the differential starting threshold value of Sudden Changing Rate of the failure protection ratio differential element of differential ring
Are as follows:
Wherein, IrΦFor stalling current, IsetFor differential current threshold value,For difference current action value, the present embodiment etc.
In differential current threshold value, KrFor conventional ratio brake coefficient；The present embodiment KrValue 0.4, double-bus, double female double segmentations, double mothers
It is single to be segmented small differential proportional brake coefficient KrValue 0.5, big differential proportional brake coefficient KrValue 0.3.
Difference current, the Sudden Changing Rate difference current of the failure protection Sudden Changing Rate ratio differential element of the differential ring are as follows:
Wherein, Kr' it is Sudden Changing Rate proportional brake coefficient, take fixed value 0.65；ΔIrΦFor Sudden Changing Rate difference current.
Failure protection ratio differential element and failure protection Sudden Changing Rate ratio differential element are the relationship of "or".
Those skilled in the art can to the present invention be modified or modification design but do not depart from think of of the invention
Think and range.Therefore, if these modifications and changes of the present invention belongs to the claims in the present invention and its equivalent technical scope
Within, then the present invention is also intended to include these modifications and variations.
Claims (9)
1. a kind of station domain failure protection system that more DC grid failures quickly isolate, which is characterized in that including station level, interval
Layer and process layer, from top to bottom using main website, the layered configuration of substation, substation configuration realizes substation operation number in wall
According to acquisition, main website configuration obtains whole station information and station domain failure protection movement outlet in station level, by substation.
2. the station domain failure protection system that a kind of more DC grid failures according to claim 1 quickly isolate, feature
It is,
Main website is based on substation and is configured, and substation is based on string and is configured；
Each substation configures a main website, and main website obtains information of voltage, current information, the circuit-breaker status of whole station by substation
Information and relay protection action message；It is communicated to connect between adjacent substations main website, main website obtains the information of adjacent substations；Main website
Turn-on time synchronizing device signal；
Substation includes string substation and transformer substation, and string substation is based on substation's string and is configured, each substation's string configuration one
A string substation；Transformer substation is based on transformer configuration, one transformer substation of each transformer configuration；Substation turn-on time is same
Walk device signal；
String substation obtains operation information in substation's string, and the interior operation information of substation's string includes: the real-time current in substation's string
Information, information of voltage, circuit breaker position information and route protection information；Transformer substation obtains three side information of transformer, transformation
Three side information of device includes current information, information of voltage, circuit breaker position information and the main transformer protection movement of real-time three side of transformer
Information；Main website is sent on after substation acquisition string three side information of interior operation information or transformer；
Main website obtains the information of the information and transformer substation sent on each string substation, receives bus protection action message, passes through phase
Adjacent main website obtains substation's phase connecting lines opposite side information and opposite side route protection action message.
3. a kind of station domain failure protection method that more DC grid failures quickly isolate, which comprises the following steps:
Step 1: to main website, main website obtains whole station letter for operation information and three side information of transformer in control sub-station Shang Song substation string
Breath；
Step 2: adjacent main website exchange correlation line information, main website obtain universe information；
Step 3: according to grid collapses, main website according to relay protection action message and position of the switch information architecture differential ring,
Differential ring configuration is carried out, relay protection issues action message；
Step 4: initiating station domain failure protection logic, according to the action message that relay protection issues, control sub-station block is corresponding disconnected
The current transformer of road device；
Step 5: according to the information of block current transformer, main website starts differential ring Protection criteria；Differential ring Protection criteria substitution
Traditional failure protection criterion；
Step 6: domain failure protection of standing movement outlet, circuit breaker trip, differential ring difference current return.
4. the station domain failure protection method that a kind of more DC grid failures according to claim 3 quickly isolate, feature
It is,
Step 1 specifically includes the following steps:
(101), string substation obtains operation information in substation's string, after string substation gets the real time information in substation's string, root
Processing is synchronized according to data markers；
(102), three side information of substation transformer is accessed in transformer substation, and transformer substation gets the reality of substation transformer
When information after, processing is synchronized according to data markers；
(103), it is sent in the real time information that string substation and transformer substation will acquire to main website, movement is believed in bus differential ring protection
Breath is sent to main website in real time, and main website gets whole station information；
(104), main website synchronizes processing to whole station information, main website obtains whole station system according to the timescale data in whole station information
A period of time target whole station information.
5. the station domain failure protection method that a kind of more DC grid failures according to claim 3 quickly isolate, feature
It is,
Step 2 specifically includes the following steps:
(201) real time information of adjacent main website exchange correlation route, main website get the real-time letter of all breakers in substation
Breath；
(202) processing is synchronized according to the timescale data in the real time information of adjacent main website exchange, main website, which is got, has system
A period of time target universe information.
6. the station domain failure protection method that a kind of more DC grid failures according to claim 3 quickly isolate, which is characterized in that
Differential ring includes Line Differential ring and bus differential ring；Line Differential ring is the current transformer of the breaker around route
The minimum differential area surrounded；Bus differential ring is differential for the minimum surrounded around the current transformer of the breaker of bus
Region；Line Differential ring includes first line differential ring and the second Line Differential ring；First line differential ring is side switch open circuit
The minimum differential area that the current transformer of device is surrounded；Second Line Differential ring for middle switch disconnector current transformer institute
The minimum differential area surrounded.
7. the station domain failure protection method that a kind of more DC grid failures according to claim 6 quickly isolate, feature
It is,
Step 3 specifically includes the following steps:
(301), differential ring configuration is configured according to bus differential ring and Line Differential ring；
Bus differential ring is configured according to bus, one bus differential ring of a bus bar configuration；It is flowed under fault-free conditions female
The vector current of line differential ring is zero, after bus differential ring is for route protection movement, side malfunctioning switch tripping；
Line Differential ring is configured according to route, one Line Differential ring of a line configuring；Line Differential ring includes connection
The middle switch disconnector of the two sides substation of route and side switch disconnector flow into the vector of Line Differential ring under fault-free conditions
Electric current is zero；
(302) if line failure, route protection movement, after string substation receives route protection action message, by route
It is sent in protection act information to main website；
(303) if bus breaks down, bus differential ring protection action message is sent master by bus differential ring protection movement
It stands.
8. the station domain failure protection method that a kind of more DC grid failures according to claim 7 quickly isolate, feature
It is,
Step 4 specifically includes the following steps:
(401) if bus differential ring protection acts, side switching dead failure occurs, substation receives the jump of side switch disconnector
Position, main website, which monitors side switch disconnector by substation, to be become jumping position from coincidence；The substation gone here and there where the switch disconnector of side receives
After side switch disconnector jumps position, the current sensor of side switch block breaker side, substation uploads side switch disconnector side electric current
Sensor current is zero；
(402) after in case of bus differential ring protection movement, side switch disconnector failure refuses to jump, string where the switch disconnector of side
Substation does not receive breaker and jumps position, and main website does not receive the side switch disconnector sent on substation and jumps position；
The switch disconnector failure when substation where switch disconnector judges, side switch disconnector are refused to jump；Substation switchs side disconnected
Road device is refused to jump and be sent in result to main website；
Main website receives the side switch disconnector protection signal of bus differential protection, receives the side switch disconnector sent on substation
It refuses to jump signal；
Current transformer corresponding to the switch disconnector of side is blocked in substation, above send the electric current to the side switch disconnector of main website to be
Zero,
Stand domain failure protection main website building first line differential ring difference current, difference current is out-of-limit；
(403) after in case of route protection movement, side switch disconnector failure tripping；Main website receives side switch disconnector quilt
Jump order；
Current sensor corresponding to breaker is blocked in substation, and above sending the electric current to the breaker of main website is zero,
Stand domain failure protection main website building bus differential ring difference current, difference current is out-of-limit；
(404) after in case of route protection movement, middle switch disconnector failure tripping；Main website receives middle switch disconnector quilt
Jump order；
Current transformer corresponding to switch disconnector in the block of substation, above send the electric current to the middle switch disconnector of main website to be
Zero,
The stand main website of domain failure protection constructs the difference current of the second Line Differential ring, and difference current is out-of-limit.
9. the station domain failure protection method that a kind of more DC grid failures according to claim 3 quickly isolate, feature
It is,
Differential ring Protection criteria specifically includes the following steps:
Stand domain failure protection main website building differential ring difference current, difference current is out-of-limit, starts the failure protection of differential ring；
Differential ring has y branch, and the electric current of each branch is IΦx(x=1,2...y), the failure protection conventional ratio of the differential ring
The difference current of differential starting element are as follows:
Wherein, Φ indicates any one phase of three-phase current A, B, C, IdΦFor difference current,For differential starting threshold value；
The Sudden Changing Rate difference current of the failure protection Sudden Changing Rate ratio differential starting element of the differential ring are as follows:
Wherein, Δ IdΦFor Sudden Changing Rate difference current,For the differential starting threshold value of Sudden Changing Rate, Δ IΦxFor xth branch current
Sudden Changing Rate；
It is logic between the differential starting element of failure protection conventional ratio and failure protection Sudden Changing Rate ratio differential starting element
The relationship of "or"；
Difference current, stalling current and the differential starting threshold value of Sudden Changing Rate of the failure protection ratio differential element of differential ring are as follows:
Wherein, IrΦFor stalling current, IsetFor differential current threshold value,For difference current action value, KrFor conventional ratiometric
Dynamic coefficient；
Difference current, the Sudden Changing Rate difference current of the failure protection Sudden Changing Rate ratio differential element of the differential ring are as follows:
Wherein, Kr' it is Sudden Changing Rate proportional brake coefficient；ΔIrΦFor Sudden Changing Rate difference current；
Failure protection ratio differential element and failure protection Sudden Changing Rate ratio differential element are the relationship of "or".
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