CN102684308A - Superconducting state information-based power distribution network self-healing system and method - Google Patents
Superconducting state information-based power distribution network self-healing system and method Download PDFInfo
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- CN102684308A CN102684308A CN2012101555022A CN201210155502A CN102684308A CN 102684308 A CN102684308 A CN 102684308A CN 2012101555022 A CN2012101555022 A CN 2012101555022A CN 201210155502 A CN201210155502 A CN 201210155502A CN 102684308 A CN102684308 A CN 102684308A
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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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
- Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
Abstract
The invention relates to a superconducting state information-based power distribution network self-healing system and method, wherein a first feeder line of a power distribution network is connected with a second feeder line by an interconnection switch, and substation outlet circuit breakers are arranged at the initial ends of the first feeder line and the second feeder line, and provided with a superconducting short circuit current limiter SFCL and a distributive FA controller; a feeder line automation control terminal FTU and a distributive FA controller are respectively arranged on section switches of the first feeder line and the second feeder line; and the feeder line automation control terminal FTU is connected on the feeder line of the power distribution network by a mutual inductor, the superconducting short circuit current limiter SFCL is directly connected on the feeder line of the power distribution network, and the distributive FA controllers conduct information interaction by an optical communication system. Based on the change information of the superconducting state of the superconducting short circuit current limiter SFCL in fault period of the power distribution network, the superconducting state information-based power distribution network self-healing system is established, the fault isolation and power restoration of the power distribution network can be realized before relay protection action of the power distribution network, and the fast self-healing function of the power distribution network under the condition of no power lose can be realized.
Description
Technical field
The present invention relates to field of distribution network, be specifically related to a kind of power distribution network self-healing system and method thereof of based superconductive state information, is that the information of application superconducting short-circuit demand limiter during the electrical network failed because is the distribution self-healing system of main criterion.
Background technology
Power distribution automation (DA) is a generalized information management system that integrates computer technology, transfer of data, control technology, sophisticated equipment and manage; Its objective is the raising power supply reliability; Improve the quality of power supply; Offer high-quality service to the user, reduce operating cost, alleviate operations staff's labour intensity.In industrially developed country, distribution system automation has received widely and having paid attention to.
China is along with the enforcement of new round power distribution automation pilot project; Intelligent distributed feed line automatization system (Feeder Automation; FA); Because of it does not rely on the global information of main website or substation, disposable handling failure, the change of distribution line is had better adaptability, is easy to safeguard etc. that characteristics receive user's favor gradually that " the power distribution automation pilot construction and upgrading engineering philosophy " that State Grid Corporation of China organized to set up in 2009 is listed intelligent distributed feed line automatization system in standard as a kind of principal mode with " Distribution Automation Technology guide rule ".Intelligent distributed feed line automatization system solution is summed up and is got up to mainly contain the distributed FA of substation level, the distributed FA of feeder line level, the distributed FA of switching stage, and the distributed FA of switching stage is divided into on-load switch pattern and circuit breaker pattern again.
Fail safe and reliability for the operation of assurance system; Comprise fault location, isolation and service restoration (Fault Location at present; Isolation and Supply Restoration, FA system FLISR) is many to provide the Fault Isolation enabling signal through transformer station's outlet protection; And after Fault Isolation is accomplished, then need manual work or system delay to produce the service restoration enabling signal.
Traditional power distribution network self-healing method needs power distribution network relaying protection action owing to short circuit current between age at failure is big, realizes that after power failure Fault Isolation and non-fault zone restore electricity, and the user must experience the process that has a power failure in short-term.
Superconductor critical temperature, critical magnetic is close and critical current density under resistivity be zero, and higher resistivity is arranged under normal operation, thereby good application prospects is arranged as the fault current limiter in the electrical network.Based on the short circuit current limiter of high temperature superconducting materia, the 35/10kV electrical network in a lot of countries and regions has the hanging net operation experience, realizes commercial application.Through utilizing the short circuit current limiting device to produce Fault Isolation and service restoration signal, possesses technological realization condition.The present invention utilizes the failure current limit technology of superconduction and the technology of obtaining of fault message, can before power distribution network relaying protection action, realize the Fault Isolation and the service restoration of power distribution network, realizes that whole power distribution network can rapidly self-healing under the situation of dead electricity.
Summary of the invention
The object of the present invention is to provide a kind of power distribution network self-healing system and method thereof of based superconductive state information; Can before power distribution network relaying protection action, realize the Fault Isolation and the service restoration of power distribution network, realize that whole power distribution network can the rapidly self-healing function under the situation of dead electricity.
For realizing above-mentioned purpose; The present invention provides a kind of power distribution network self-healing method of based superconductive state information; Utilize superconducting short-circuit demand limiter (Superconducting Fault Current Limiter; SFCL) for distributed feed line automatization system FA actuating signal is provided, method may further comprise the steps:
Steps A: whether superconducting short-circuit demand limiter SFCL differentiates according to the size of current of each test point is the fault point; When the electric current of the test point critical current more than or equal to superconducting short-circuit demand limiter SFCL, then test point is judged to the fault point, and then superconducting short-circuit demand limiter SFCL sends fault location signal and isolation signals to distributed feed line automatization system FA; When the electric current of test point critical current, do not carry out any step less than superconducting short-circuit demand limiter SFCL.
In the wherein said steps A, after fault took place, superconducting short-circuit demand limiter SFCL quench in 200 milliseconds prior to the relaying protection action, reduced short circuit current, does not influence original operational procedure; The superconducting device quench is just sent fault location information and isolation signals, and the reaction time is short, and reliability is high.Under the normal operating condition, superconducting short-circuit demand limiter SFCL is in superconducting state, and the FA system is in normal operating condition, and power distribution network operation is normal, gathers the metric data of each test point, whether differentiates needs isolated fault point according to the size of current of test point.
May further comprise the steps in the said steps A:
Steps A 1: superconducting short-circuit demand limiter SFCL gathers the metric data of each test point, relatively the critical current of the size of current of test point and superconducting short-circuit demand limiter SFCL size;
Steps A 2: when the electric current of test point critical current greater than superconducting short-circuit demand limiter SFCL; Then test point is judged to the fault point, and superconducting short-circuit demand limiter SFCL gets into the quench state and sends fault location signal and isolation signals to distributed feed line automatization system FA; When the electric current of the test point critical current smaller or equal to superconducting short-circuit demand limiter SFCL, superconducting short-circuit demand limiter SFCL is a superconducting state, and the FA system is in normal operating condition, and the power distribution network operation is normal, continues to gather the metric data of each test point.
Also comprise before the wherein said steps A 1: under normal operation, distributed feed line automatization system FA system can gather the real-time measurement data and upload main website or data center.
Step B: SFCL sends fault location signal and isolation signals according to the superconducting short-circuit demand limiter, and distributed feed line automatization system FA positions and implement the fault point to isolate;
Wherein, among the said step B, SFCL becomes the quench state when the superconducting short-circuit demand limiter, and when being high-impedance state, the current in the fault point of power distribution network and voltage are in stationary value basically, and distributed feed line automatization system data acquisition will be more accurate and stable.Among the said step B, during distributed feed line automatization system FA fault location, the operate time that consider flow restricter be converted into strong resistance state after, the fluctuation of system measurements data.
May further comprise the steps among the said step B:
Step B1: distributed feed line automatization system FA realizes localization of fault according to the distribution situation of the short circuit current between age at failure;
Step B2: after distributed feed line automatization system FA confirmed fault location point, distributed feed line automatization system FA implemented to isolate to the fault point through the block switch around the tripping fault point;
Wherein, Among the said step B2, because the influence of superconducting short-circuit demand limiter SFCL metering function, the size of current of fault point is restricted; Distributed feed line automatization system FA is after fault location; Directly the remote control block switch is in off-state, need not the outlet breaker tripping operation, therefore can realize not having the outage isolated fault.
Step C: after the fault point separate row is removed; Superconducting short-circuit demand limiter SFCL is a superconducting state from the quench recovering state; Simultaneously send the service restoration signal by superconducting short-circuit demand limiter SFCL to distributed feed line automatization system FA, distributed feed line automatization system FA restores electricity to non-fault zone (zone of promptly not breaking down);
Wherein, among the said step C, after distributed feed line automatization system FA got rid of fault, superconducting short-circuit demand limiter SFCL transferred superconducting state to, and service restoration is normal between bus and fault point; If distributed feed line automatization system FA can't excise fault, superconducting short-circuit demand limiter SFCL then is in the quench state all the time, trips until outlet breaker.
May further comprise the steps among the said step C:
Step C1: distributed feed line automatization system FA separate row is removed the fault point, and behind the elimination short circuit current, superconducting short-circuit demand limiter SFCL is a superconducting state from the quench recovering state;
Step C2: after superconducting short-circuit demand limiter SFCL confirmed that the fault point isolates successfully, superconducting short-circuit demand limiter SFCL sent non-fault zone load service restoration signal to distributed feed line automatization system FA;
Step C3: distributed feed line automatization system FA receives after the service restoration signal, and non-fault zone is restored electricity;
Wherein, Among the said step C2, after superconducting short-circuit demand limiter SFCL transfers superconducting state to, send the fault recovery signal after; Distributed feed line automatization system FA is that non-fault zone restores electricity; If fault for the second time takes place this moment, superconducting short-circuit demand limiter SFCL is quench once more, reduces the short circuit current size.
Step D: after the fault point fault is thoroughly got rid of (being after the fault point fault is isolated automatically), distributed feed line automatization system FA system will select former fault point on every side block switch carry out closing operation, realize former fault point service restoration.Wherein, before the said step D, the personnel that patrol and examine come the failure judgement point through the block switch position of separating brake.
The principle of the invention is following: when fault current surpassed the operating current of SFCL, SFCL utilizes superconductor, and characteristic jumpy got into high-impedance state and keeps constantly from superconducting state to the normal state impedance, and " quench " time t is a Millisecond.Utilize this characteristic, can be with SFCL " quench " Fault Isolation enabling signal as FA.The FA system receives after the Fault Isolation signal that SFCL sends, the fault point is isolated.After the fault point successfully isolates, SFCL will transfer " superconduction " attitude to from " quench " attitude, send non-fault zone load restoration signal, and the load power supply of non-fault zone recovers through the adjustment operational mode in the FA system.
The 10kV single-line to ground fault when taking place in electrical network, if fault current does not reach SFCL's " quench " electric current, the FA system does not carry out Fault Isolation, according to national current standard, keeps single-phase node running status.
Based on the distribution network failure of SFCL device and FA system dead electricity self-healing system (Advanced Feeder Automation not; AFA); Be easy to strengthen the reaction speed and the reliability of FLISR (fault location, isolation and recovery) through the SFCL device on Installation and Debugging and the high basis that adapts at inheriting tradition FA.
For realizing above-mentioned purpose; The present invention correspondingly provides a kind of power distribution network self-healing system of based superconductive state information; Comprise first feeder line, second feeder line, interconnection switch; Block switch, transformer station's outlet breaker, and superconducting short-circuit demand limiter SFCL, distributed FA controller and feeder automation detection and control terminal (Feeder Terminal Unit, FTU);
Wherein, Said first feeder line connects said second feeder line through said interconnection switch, said transformer station outlet breaker is installed and is correspondingly disposed said superconducting short-circuit demand limiter SFCL and said distributed FA controller at said first feeder line and the said second feeder line head end; On said first feeder line and said second feeder line said block switch is set respectively and correspondingly disposes said feeder automation detection and control terminal FTU and said distributed FA controller; Said distributed FA controller is connected in the power distribution network through instrument transformer, and superconducting short-circuit demand limiter SFCL directly is connected on the power distribution network circuit.
Distributed FA controller is the controller of power distribution network, and each test point of power distribution network is equipped with said block switch.
In sum; The present invention is based on the change information of the superconducting state of superconducting short-circuit demand limiter SFCL during distribution network failure; Set up the power distribution network self-healing system and the method thereof of based superconductive state information; The superconducting state information of superconducting short-circuit demand limiter SFCL before and after distribution network failure and the coordination mechanism of power distribution network self-healing system; Guarantee the Fault Identification and the startup of power distribution network self-healing system, before power distribution network relaying protection action, realize the Fault Isolation and the service restoration of power distribution network, realize the not rapidly self-healing function under the dead electricity situation of power distribution network.
In simple terms, the present invention adds the SFCL device in the feeder line exit, reduces the impact of short circuit current to system; According to " quench " attitude of SFCL, isolate enabling signal as the FA system failure; According to " quench recovery " state of SFCL, as FA system non-fault zone load restoration signal.The present invention makes it compared with prior art owing to adopted above technical scheme, and the present invention has the following advantages:
1, the present invention realizes full self-healing notion with SFCL and FA systems incorporate.Insert the distribution rack of SFCL and FA system, after fault takes place, through fault location, the realization self-healing of Fault Isolation and service restoration.
2, utilize SFCL to produce Fault Isolation and fault recovery signal, need not to change existing transforming plant protecting setting, Installation and Debugging are simple.
3, SFCL itself possesses verifying function.If the FA system runs into extreme case, can't normal running, the SFCL system can guarantee 3 ~ 4 times of states operation down at normal running current, the reliability of increase whole system.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is a workflow sketch map of the present invention.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is made detailed explanation, but following enforcement row are not to be used to limit the present invention.
Fig. 1 is a structural representation of the present invention.
Please refer to Fig. 1; A kind of power distribution network self-healing system of based superconductive state information; Comprise first feeder line 1, second feeder line 2, interconnection switch 3, block switch 4, transformer station's outlet breaker 5, superconducting short-circuit demand limiter SFCL6, distributed FA controller 7 and feeder automation detection and control terminal FTU8;
Wherein, first feeder line 1 connects second feeder line 2 through interconnection switch 3, is transformer station's outlet breaker 5 at the head end of first feeder line 1 and second feeder line 2, correspondingly disposes superconducting short-circuit demand limiter SFCL6 and distributed FA controller 7; Block switch 4 on first feeder line 1 and second feeder line 2 is provided with corresponding feeder automation detection and control terminal FTU8 and distributed FA controller 7 respectively; Feeder automation detection and control terminal FTU8 is connected in the power distribution network through instrument transformer, and superconducting short-circuit demand limiter SFCL6 directly is connected on the power distribution network circuit.Distributed FA controller 7 is controllers of power distribution network self-healing system, and each distributed FA controller 7 carries out information interaction through optical fiber telecommunications system.
Whether superconducting short-circuit demand limiter SFCL differentiates according to the size of current of each test point is the fault point; When the electric current of the test point critical current more than or equal to superconducting short-circuit demand limiter SFCL, then test point is judged to the fault point, and then superconducting short-circuit demand limiter SFCL sends fault location signal and isolation signals to distributed feed line automatization system FA; When the electric current of test point critical current, do not carry out any step less than superconducting short-circuit demand limiter SFCL.
After fault took place, superconducting short-circuit demand limiter SFCL quench in 200 milliseconds prior to the relaying protection action, reduced short circuit current, does not influence original operational procedure; The superconducting device quench is just sent fault location information and isolation signals, and the reaction time is short, and reliability is high.Under the normal operating condition, superconducting short-circuit demand limiter SFCL is in superconducting state, and the FA system is in normal operating condition, and power distribution network operation is normal, gathers the metric data of each test point, whether differentiates needs isolated fault point according to the size of current of test point.
When the electric current of the test point critical current greater than superconducting short-circuit demand limiter SFCL, then test point is judged to the fault point, and superconducting short-circuit demand limiter SFCL gets into the quench state and sends fault location signal and isolation signals to distributed feed line automatization system FA; When the electric current of the test point critical current smaller or equal to superconducting short-circuit demand limiter SFCL, superconducting short-circuit demand limiter SFCL is a superconducting state, and the FA system is in normal operating condition, and the power distribution network operation is normal, continues to gather the metric data of each test point.
SFCL sends fault location signal and isolation signals according to the superconducting short-circuit demand limiter, and the FA of distributed self-healing system positions and implement the fault point to isolate; Distributed FA controller has been realized the distributed self-healing algorithm, and it collects the data that superconductive current limiter SFCL and FTU gather, and communicate by letter with adjacent FA controller, coordination and cooperation realization distributed self-healing algorithm.The characteristic feature of this algorithm is when the system encounters permanent fault; Outlet breaker moves because of protection after the tripping; Distributed self-healing algorithm algorithm starts location algorithm, confirms the guilty culprit zone, and then that the fault zone is peripheral switch tripping is with isolated fault; After the success, the close outlet breaker that is in non-faulty section or interconnection switch are to recover the power supply of non-fault zone again.
Fig. 1 is a structural representation of the present invention; Fig. 2 is a workflow sketch map of the present invention.
Please refer to Fig. 1 and Fig. 2, a kind of power distribution network self-healing method of based superconductive state information, utilizing superconducting short-circuit demand limiter SFCL is that distributed feed line automatization system FA provides actuating signal, method may further comprise the steps:
Steps A: whether superconducting short-circuit demand limiter SFCL6 differentiates according to the size of current of each test point is the fault point; When the electric current of the test point critical current more than or equal to superconducting short-circuit demand limiter SFCL6, then test point is judged to the fault point, and then superconducting short-circuit demand limiter SFCL6 sends fault location signal and isolation signals to distributed feed line automatization system FA; When the electric current of test point critical current, do not carry out any step less than superconducting short-circuit demand limiter SFCL6.
In the wherein said steps A, after fault took place, superconducting short-circuit demand limiter SFCL6 quench in 200 milliseconds prior to the relaying protection action, reduced short circuit current, does not influence original operational procedure; The superconducting device quench is just sent fault location information and isolation signals, and the reaction time is short, and reliability is high.Under the normal operating condition, superconducting short-circuit demand limiter SFCL6 is in superconducting state, and the FA system is in normal operating condition, and power distribution network operation is normal, gathers the metric data of each test point, whether differentiates needs isolated fault point according to the size of current of test point.
May further comprise the steps in the said steps A:
Steps A 1: superconducting short-circuit demand limiter SFCL6 gathers the metric data of each test point, relatively the critical current of the size of current of test point and superconducting short-circuit demand limiter SFCL6 size;
Steps A 2: when the electric current of test point critical current greater than superconducting short-circuit demand limiter SFCL6; Then test point is judged to the fault point, and superconducting short-circuit demand limiter SFCL6 gets into the quench state and sends fault location signal and isolation signals to distributed feed line automatization system FA; When the electric current of the test point critical current smaller or equal to superconducting short-circuit demand limiter SFCL6, superconducting short-circuit demand limiter SFCL6 is a superconducting state, and the FA system is in normal operating condition, and the power distribution network operation is normal, continues to gather the metric data of each test point.
Also comprise before the wherein said steps A 1: under normal operation, distributed feed line automatization system FA system can gather the real-time measurement data and upload main website or data center.
Step B: SFCL6 sends fault location signal and isolation signals according to the superconducting short-circuit demand limiter, and distributed feed line automatization system FA positions and implement the fault point to isolate;
Wherein, among the said step B, SFCL6 becomes the quench state when the superconducting short-circuit demand limiter, and when being high-impedance state, the current in the fault point of power distribution network and voltage are in stationary value basically, and distributed feed line automatization system data acquisition will be more accurate and stable.Among the said step B, during distributed feed line automatization system FA fault location, the operate time that consider flow restricter be converted into strong resistance state after, the fluctuation of system measurements data.
May further comprise the steps among the said step B:
Step B1: distributed feed line automatization system FA realizes localization of fault according to the distribution situation of the short circuit current between age at failure;
Step B2: after distributed feed line automatization system FA confirmed fault location point, distributed feed line automatization system FA implemented to isolate through 4 pairs of fault points of the block switch around the tripping fault point;
Wherein, Among the said step B2, because the influence of superconducting short-circuit demand limiter SFCL6 metering function, the size of current of fault point is restricted; Distributed feed line automatization system FA is after fault location; Directly remote control block switch 4 is in off-state, need not the outlet breaker tripping operation, therefore can realize not having the outage isolated fault.
Step C: after the fault point separate row is removed; Superconducting short-circuit demand limiter SFCL6 is a superconducting state from the quench recovering state; Simultaneously send the service restoration signal by superconducting short-circuit demand limiter SFCL6 to distributed feed line automatization system FA, distributed feed line automatization system FA restores electricity to non-fault zone (zone of promptly not breaking down);
Wherein, among the said step C, after distributed feed line automatization system FA got rid of fault, superconducting short-circuit demand limiter SFCL6 transferred superconducting state to, and service restoration is normal between bus and fault point; If distributed feed line automatization system FA can't excise fault, superconducting short-circuit demand limiter SFCL6 then is in the quench state all the time, trips until outlet breaker.
May further comprise the steps among the said step C:
Step C1: distributed feed line automatization system FA separate row is removed the fault point, and behind the elimination short circuit current, superconducting short-circuit demand limiter SFCL6 is a superconducting state from the quench recovering state;
Step C2: after superconducting short-circuit demand limiter SFCL6 confirmed that the fault point isolates successfully, superconducting short-circuit demand limiter SFCL6 sent non-fault zone load service restoration signal to distributed feed line automatization system FA;
Step C3: distributed feed line automatization system FA receives after the service restoration signal, and non-fault zone is restored electricity;
Wherein, Among the said step C2, after superconducting short-circuit demand limiter SFCL6 transfers superconducting state to, send the fault recovery signal after; Distributed feed line automatization system FA is the load restoration power supply of non-fault zone; If fault for the second time takes place this moment, superconducting short-circuit demand limiter SFCL6 is quench once more, reduces the short circuit current size.
Step D: after the fault point fault is thoroughly got rid of (being after the fault point fault is isolated automatically), distributed feed line automatization system FA system will select former fault point on every side block switch 4 carry out closing operation, realize former fault point service restoration.Wherein, before the said step D, the personnel that patrol and examine come the failure judgement point through block switch 4 positions of separating brake.
The principle of the invention is following: when fault current surpassed the operating current of SFCL, SFCL utilizes superconductor, and characteristic jumpy got into high-impedance state and keeps constantly from superconducting state to the normal state impedance, and " quench " time t is a Millisecond.Utilize this characteristic, can be with SFCL " quench " Fault Isolation enabling signal as FA.The FA system receives after the Fault Isolation signal that SFCL sends, the fault point is isolated.After the fault point successfully isolates, SFCL will transfer " superconduction " attitude to from " quench " attitude, send non-fault zone load restoration signal, and the load power supply of non-fault zone recovers through the adjustment operational mode in the FA system.
The 10kV single-line to ground fault when taking place in electrical network, if fault current does not reach SFCL's " quench " electric current, the FA system does not carry out Fault Isolation, according to national current standard, keeps single-phase node running status.
Based on the distribution network failure of SFCL device and FA system dead electricity self-healing system (Advanced Feeder Automation not; AFA); Be easy to strengthen reaction speed and the reliability of FLISR through the SFCL device on Installation and Debugging and the high basis that adapts at inheriting tradition FA.
In sum; The present invention is based on the change information of the superconducting state of high-temperature superconductor short circuit current limiter during distribution network failure; Set up the power distribution network self-healing system of based superconductive state information; Before power distribution network relaying protection action, realize the Fault Isolation and the service restoration of power distribution network, realize the not rapidly self-healing function under the dead electricity situation of power distribution network.
Concerning those skilled in the art, in not breaking away from essential scope of the present invention, the foregoing description is carried out suitable replacement or revises all will dropping in the scope of claim of the present invention.Exemplary enforcement only is illustrative, rather than to qualification of the present invention, scope of the present invention is defined by appended claim.
Claims (12)
1. the power distribution network self-healing method of a based superconductive state information is characterized in that, comprises step:
Steps A: whether superconducting short-circuit demand limiter SFCL differentiates according to the size of current of each test point is the fault point; When the electric current of the test point critical current more than or equal to superconducting short-circuit demand limiter SFCL, then test point is judged to the fault point, and then superconducting short-circuit demand limiter SFCL sends fault location signal and isolation signals to distributed feed line automatization system FA; When the electric current of test point critical current, do not carry out any step less than superconducting short-circuit demand limiter SFCL.
2. may further comprise the steps in the said steps A:
Steps A 1: superconducting short-circuit demand limiter SFCL gathers the metric data of each test point, relatively the critical current of the size of current of test point and superconducting short-circuit demand limiter SFCL size;
Steps A 2: when the electric current of test point critical current greater than superconducting short-circuit demand limiter SFCL; Then test point is judged to the fault point, and superconducting short-circuit demand limiter SFCL gets into the quench state and sends fault location signal and isolation signals to distributed feed line automatization system FA; When the electric current of the test point critical current smaller or equal to superconducting short-circuit demand limiter SFCL, superconducting short-circuit demand limiter SFCL is a superconducting state, and the FA system is in normal operating condition, and the power distribution network operation is normal, continues to gather the metric data of each test point.
3. step B: SFCL sends fault location signal and isolation signals according to the superconducting short-circuit demand limiter, and distributed feed line automatization system FA positions and implement the fault point to isolate;
May further comprise the steps among the said step B:
Step B1: distributed feed line automatization system FA realizes localization of fault according to the distribution situation of the short circuit current between age at failure;
Step B2: after distributed feed line automatization system FA confirmed fault location point, distributed feed line automatization system FA implemented to isolate to the fault point through the block switch around the tripping fault point;
Step C: after the fault point separate row is removed; Superconducting short-circuit demand limiter SFCL is a superconducting state from the quench recovering state; Superconducting short-circuit demand limiter SFCL sends the service restoration signal to distributed feed line automatization system FA simultaneously, and distributed feed line automatization system FA restores electricity to non-fault zone (zone of promptly not breaking down);
May further comprise the steps among the said step C:
Step C1: distributed feed line automatization system FA separate row is removed the fault point, and behind the elimination short circuit current, superconducting short-circuit demand limiter SFCL is a superconducting state from the quench recovering state;
Step C2: after superconducting short-circuit demand limiter SFCL confirmed that the fault point isolates successfully, superconducting short-circuit demand limiter SFCL sent non-fault zone load service restoration signal to distributed feed line automatization system FA;
Step C3: distributed feed line automatization system FA receives after the service restoration signal, and non-fault zone is restored electricity;
Step D: after the fault point fault is automatically isolated, distributed feed line automatization system FA system will select former fault point on every side block switch carry out closing operation, realize former fault point service restoration.
4. the power distribution network self-healing method of based superconductive state information according to claim 1; It is characterized in that; Also comprise before the said steps A 1: under normal operation, distributed feed line automatization system FA system can gather the real-time measurement data and upload main website or data center.
5. the power distribution network self-healing method of based superconductive state information according to claim 1 is characterized in that, in the said steps A; After fault took place, superconducting short-circuit demand limiter SFCL quench in 200 milliseconds was moved prior to relaying protection; Reduce short circuit current, do not influence original operational procedure; The superconducting device quench is just sent fault location information and isolation signals, and the reaction time is short, and reliability is high.
6. the power distribution network self-healing method of based superconductive state information according to claim 1; It is characterized in that; Among the said step B, SFCL becomes the quench state when the superconducting short-circuit demand limiter, when being high-impedance state; The current in the fault point of power distribution network and voltage are in stationary value basically, and distributed feed line automatization system data acquisition will be more accurate and stable.
7. the power distribution network self-healing method of based superconductive state information according to claim 1; It is characterized in that, among the said step B, during distributed feed line automatization system FA fault location; After considering the operate time of flow restricter and being converted into strong resistance state, the fluctuation of system measurements data.
8. the power distribution network self-healing method of based superconductive state information according to claim 1 is characterized in that, among the said step B2; Because the influence of superconducting short-circuit demand limiter SFCL metering function; The size of current of fault point is restricted, and distributed feed line automatization system FA is after fault location, and directly the remote control block switch is in off-state; Need not the outlet breaker tripping operation, therefore can realize not having the outage isolated fault.
9. the power distribution network self-healing method of based superconductive state information according to claim 1; It is characterized in that, among the said step C, after distributed feed line automatization system FA gets rid of fault; Superconducting short-circuit demand limiter SFCL transfers superconducting state to, and service restoration is normal between bus and fault point; If distributed feed line automatization system FA can't excise fault, superconducting short-circuit demand limiter SFCL then is in the quench state all the time, trips until outlet breaker.
10. the power distribution network self-healing method of based superconductive state information according to claim 1 is characterized in that, among the said step C2; After superconducting short-circuit demand limiter SFCL transfers superconducting state to; After sending the fault recovery signal, distributed feed line automatization system FA is the load restoration power supply of non-fault zone, if fault for the second time takes place this moment; Superconducting short-circuit demand limiter SFCL is quench once more, reduces the short circuit current size.
11. the power distribution network self-healing method of based superconductive state information according to claim 1 is characterized in that, before the said step D, the personnel that patrol and examine come the failure judgement point through the block switch position of separating brake.
12. the power distribution network self-healing system of a based superconductive state information; Comprise first feeder line, second feeder line, interconnection switch; Block switch, transformer station's outlet breaker; Superconducting short-circuit demand limiter SFCL, distributed FA controller and feeder automation detection and control terminal FTU is characterized in that said first feeder line connects said second feeder line through said interconnection switch; Head end at said first feeder line and said second feeder line is transformer station's outlet breaker, correspondingly disposes said superconducting short-circuit demand limiter SFCL and said distributed FA controller; Said block switch on said first feeder line and said second feeder line is provided with corresponding said feeder automation detection and control terminal FTU and said distributed FA controller respectively; Said feeder automation detection and control terminal FTU is connected in the power distribution network through instrument transformer, and superconducting short-circuit demand limiter SFCL directly is connected on the power distribution network circuit; The controller that said distributed FA controller is the power distribution network self-healing system, each said distributed FA controller carries out information interaction through optical fiber telecommunications system.
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