CN103022994A - Method for achieving fault isolation and recovery of power distribution network with permeability distribution type power supply - Google Patents
Method for achieving fault isolation and recovery of power distribution network with permeability distribution type power supply Download PDFInfo
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- CN103022994A CN103022994A CN2012105291305A CN201210529130A CN103022994A CN 103022994 A CN103022994 A CN 103022994A CN 2012105291305 A CN2012105291305 A CN 2012105291305A CN 201210529130 A CN201210529130 A CN 201210529130A CN 103022994 A CN103022994 A CN 103022994A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
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Abstract
A method for achieving fault isolation and recovery of a power distribution network with a permeability distribution type power supply belongs to the field of power distribution network operation management and is characterized by achieving fault isolation and recovery of the power distribution network with the permeability distribution type power supply on the basis of the intelligent distribution type feeder automation mode and is high in the intelligent degree and fast and accurate in judgment in the fault isolation and recovery process. The logical conditions can be modified and supplemented according to the practical topological structure of the power grid, and the whole control mode is based on the existing equipment and is not limited by the existing equipment. The various action logical conditions can be modified and supplemented according to the practical topological structure of the power grid along with continuous updating of the intelligent power grid equipment, so that computer simulation and fault trend analysis are facilitated, and guarantee is provided for scheduling and operation management of the power distribution network with the permeability distribution type power supply. The method can be widely applied to the field of scheduling, operation management and fault emergency treatment of the intelligent power grid.
Description
Technical field
The invention belongs to the operation and management field of power distribution network, relate in particular to a kind of Fault Isolation for power distribution network and restoration methods.
Background technology
From eighties of last century since the nineties, the distributed power generation development rapidly, in the world many countries all the basis of regenerative resource as energy policy, the development of distributed power generation has become the scale of countries in the world sustainable development.
China's distributed power generation development is evening, and in recent years, the clean energy resource distributed power generation just begins starting.In recent years, the development of China's distributed power source rapidly.
At present, a large amount of fast developments of distributed power source have proposed stern challenge for the networking support of help from government policy and electrical network.
Along with a large amount of distributed power generation access urban power distribution networks, can bring many new technology and the problems of management such as the quality of power supply, the impact on relaying protection, short circuit current distribution, islet operation.And when distributed power source was penetrated on the 10kV feeder line, original feeder automation solution can not be processed the feeder fault problem.When breaking down on the feeder line, the distributed power source on transformer station's outlet power supply and the feeder line brings contribution all can for the fault current of fault point, so fault current is two-way, the fault detection mechanism of distribution network terminal will redesign in original like this feeder automation; On the other hand, in troubleshooting and the recovery process, distributed power source all brings a lot of problems that need consideration from technology and management aspect for the power supply service recovery.
Feeder automation is the important component part of distribution automation, and its rapidly isolated fault recovers the power supply of non-fault zone, improves the power supply reliability of distribution.
At present, the main focus of the research of home and abroad is distributed power source to the impact of distribution network protection, the changing unit of distribution trend, specializes in to contain DG(distribute dgeneration, distributed power source) the feeder automation solution fewer.
At home, the scholar Lu Zhigang of University On The Mountain Of Swallows, Dong Yuxiang have delivered article " the distribution network failure recovery policy that contains distributed power source " in " Automation of Electric Systems " first phase in 2007, the fail-over policy of a kind of new consideration DG has been proposed, under conscious islet operation pattern, adopt push back before improved for method to the calculation of distribution network that contains DG the distribution trend, provided distribution network failure recovering step and the Case Simulation of considering DG.
The day for announcing is on January 19th, 2011, Granted publication number is the Chinese invention patent of CN 101552461B, a kind of " containing distributed power source distribution protection method " disclosed, it is for the situation that is connected to one or more distributed power source at power distribution network bus place, upstream region at access distributed power source power distribution network, install the directional pilot protection device additional, adopt simultaneously the specified time overcurrent protection mode with direction component in this zone; For the situation that is connected at least one distributed power source in the non-bus part of power distribution network; upstream region at access distributed power source power distribution network installs the directional pilot protection device additional, at its downstream area; install overcurrent protective device additional, and the inverse time over-current protection mode is adopted in whole zone.As seen, this technical scheme mainly by traditional current protection configuration is improved, guarantees to contain the reliable excision of DG distribution system fault.Because it just is confined to traditional conventional relaying protection system; and its goal of the invention is the rapid excision to the distributed power source that breaks down; do not observe, deal with problems from the angle of whole distribution network; lack the visual field of overall grid scheduling and management, can not adapt to now operation, scheduling and the managerial skills of intelligentized power distribution network.
As for the feeder automation FA(feeder automation that contains distributed power source) solution, there are no Application and Development, there is not application example in electric company yet.
Summary of the invention
Technical problem to be solved by this invention provides a kind of distribution network failure isolation and restoration methods that realizes osmotic formula power supply, it is based on intelligent distributed feeder automation pattern, realize including Fault Isolation and the recovery process of the power distribution network of distributed power source, intelligent degree is high in its fault eliminating and the recovery process, swift with judgement, accurate, logical condition can be made amendment and replenishes according to the real topology of electrical network, for scheduling and the operational management of the power distribution network that includes distributed power source provides assurance.
Technical scheme of the present invention is: a kind of distribution network failure isolation and restoration methods that realizes osmotic formula power supply, comprise Fault Isolation and the recovery of power distribution network, and it is characterized in that:
1-1) described distribution network failure isolation and restoration methods realize the distribution network failure isolation of osmotic formula power supply based on intelligent distributed feeder automation pattern and recover;
1-2) after satisfied " fault initiating " condition, each FA intelligence substation controller is formed a formation carry out continuous monitoring, and share voltage, the position of the switch, the malfunction of feeder line, the information such as access state of distributed power source between each FA intelligence substation controller;
1-3) the place feeder switch controller that breaks down carries out fault and judges that the switch before and after the fault point is carried out " tripping operation " and moved, thereby fault is excised automatically after learning coherent signal;
1-4) by the peer to peer communication between the controller of each FA intelligence substation, other switch obtains the information of having excised about which switch in the group;
1-5) according to Fault Isolation logic and fault recovery logic, each switch will be according to own position in feeder line, and whether decision carries out " closure " operation automatically, recovers rapidly the normal interval power supply of this circuit by " recovery process ";
If 1-6) satisfy the condition that is incorporated into the power networks, the distributed electrical source automatic carries out " simultaneous interconnecting " operation;
1-7) carry out the post-fault operation.
Wherein, described " fault initiating " condition is to receive the relay protection signal of outlet breaker and " separating brake " status signal, and this switch is in " decompression " state, waits for very first time set point, guarantees that distributed power source is incorporated into the power networks.
Above-mentioned very first time set point is 5 seconds.
After fault occurs, described FA intelligence substation controller is from outlet breaker, on off state and fault message are notified to related switch, determine abort situation by the place controller, fault point front-rear switch isolation, the state of the switch that links to each other with distributed power source general and site switch is passed to the control unit of outlet breaker.
Its described peer to peer communication is realized by communication network and the position of the switch state message of each FA intelligence substation controller.
Concrete, its described Fault Isolation logic is
If 6-1) switch receives that fault message and self are in " decompression " state, tripping switch then, simultaneously with the fault message to the next stage transmission;
6-2) from outlet breaker, before interconnection switch, the successively tripping of all switches.If 6-3) this switch failure can not tripping, be recorded as " refuse minute " state, will " refuse minute " state notifying proximity switch, troubleshooting stops;
If 6-4) communication of the switch of next stage is unsuccessful, the not smooth switch of communication is arranged around the record, troubleshooting stops.
Its described recovery process from outlet breaker and interconnection switch simultaneously; Described fault recovery logic is
7-1) for outlet breaker and interconnection switch:
If switch of A is outlet breaker, there is not the switch of overcurrent on every side, then outlet breaker is closed;
The switch that overcurrent is arranged on every side, and cut-off switch is arranged on every side, then circuit breaker is understood closure, moves and successfully notifies afterwards proximity switch;
If switch of B is interconnection switch, the switch of overcurrent is arranged on every side, then interconnection switch keeps separating brake;
The switch that does not have overcurrent on every side, and cut-off switch is arranged on every side, then interconnection switch can be closed, the backward outlet breaker direction notice of success proximity switch;
7-2) for other switch:
If a switch success tripping receives that adjacent switch successfully recovers message, then enters recovery process;
The switch that disconnection is arranged around the switch, this is as the decompression switch and do not have overcurrent, if be all on every side decompression but not excess flow switch or two excess flow switchs are arranged or this switch this as the end switch that directly connects load, then this switch can be closed;
The switch that disconnection is arranged around the switch, but this is as decompression switch overcurrent, if two excess flow switchs are arranged on every side; Then this switch can be closed, otherwise keep separated position;
When closing a floodgate, each switch must notify switch on every side, to prevent the cyclization operation.
Its described condition of being incorporated into the power networks is the conventional grid generation equipment condition that is incorporated into the power networks.
Compared with the prior art, advantage of the present invention is:
1. for Fault Isolation and the recovery process of the power distribution network that includes distributed power source, introduced intelligent distributed feeder automation pattern, intelligent degree is high in its fault eliminating and the recovery process, swift with judgement, accurate, logical condition can be made amendment and replenishes according to the real topology of electrical network;
2. whole control model is not subjected to again the restriction of existing equipment based on existing equipment, and along with the continuous upgrading of intelligent grid equipment, control strategy can constantly be adjusted and replenish, and is irrelevant with the hardware concrete structure;
3. the exercises logical condition can be made amendment and replenishes according to the real topology of electrical network, is convenient to Computer Simulation and Fault load flow analysis, for scheduling and the operational management of the power distribution network that includes osmotic formula power supply provides assurance.
Description of drawings
Fig. 1 is method flow block diagram of the present invention;
Fig. 2 is the process blocks schematic diagram that calculates adjacent feeders section load;
Fig. 3 is the process blocks schematic diagram of seeking interconnection switch;
Fig. 4 is the process blocks schematic diagram of fault entry condition;
Fig. 5 is that the position of the switch that special circumstances are processed concerns schematic diagram.
Embodiment
The present invention will be further described below in conjunction with drawings and Examples.
Among Fig. 1, the invention provides a kind of distribution network failure isolation and restoration methods that realizes osmotic formula power supply, comprise Fault Isolation and the recovery of power distribution network, the inventive point of its technical scheme is:
1-1) described distribution network failure isolation and restoration methods realize the distribution network failure isolation of osmotic formula power supply based on intelligent distributed feeder automation pattern and recover:
1-2) after satisfied " fault initiating " condition, each FA intelligence substation controller is formed a formation carry out continuous monitoring, and share voltage, the position of the switch, the malfunction of feeder line, the information such as access state of distributed power source between each FA intelligence substation controller;
1-3) the place feeder switch that breaks down carries out fault and judges that send " tripping operation " signal by relaying protection system, this switch is carried out " tripping operation " and moved, thereby fault is excised automatically after learning " overcurrent " or " decompression " signal;
1-4) by the peer to peer communication between the controller of each FA intelligence substation, other switch obtains the information of having excised about which switch in the group;
1-5) according to Fault Isolation logic and fault recovery logic, each switch will be according to own position in system, automatically determine it is that immediately " tripping operation " is with excision fault, quick isolated fault point, or carry out " closure " operation, recover rapidly the normal interval power supply of this circuit by " recovery process ";
If 1-6) satisfy the condition that is incorporated into the power networks, the distributed electrical source automatic carries out " simultaneous interconnecting " operation;
1-7) carry out the post-fault operation.
Wherein, described " fault initiating " condition is to receive the relay protection signal of outlet breaker and " separating brake " status signal, and this switch is in " decompression " state, waits for very first time set point (5 seconds), guarantees that distributed power source is incorporated into the power networks.
After fault occurs, described FA intelligence substation controller is from outlet breaker, on off state and fault message are transmitted backward, and switch is isolated successively, and the switch general who links to each other with distributed power source and the state of site switch are passed to the control unit of outlet breaker.
Its described peer to peer communication is realized by communication network and the position of the switch state message of each FA intelligence substation controller.
Feeder automation (feeder automation, FA) refers to transformer station's outlet to the feeder line automation between the user power utilization equipment, and its content can be summarized as two broad aspect: the one, and user under normal circumstances detects, data is measured and operation is optimized; The 2nd, the fault detect under the accident condition, Fault Isolation, the control of shifting and restore electricity.
Feeder automation is distribution network automated important component part.Realize feeder automation, need rational distribution net work structure, possess the condition of ring network power supply; The operating mechanism of switch must have the remote operation function in each loop networks switch, on-load switch and the final stage power distribution station; The working power that must possess reliable switching manipulation power supply in the loop-network switch cabinet and use for FTU (Feeder Terminal Unit, line feed terminals unit), communication equipment; The communication system that possesses reliably, is not affected by the external environment.
As shown in the above, the basic logic course of action of FA is as follows:
1. initialization, the necessary information of reader switch and adjacent switch;
2. calculate adjacent feeders section load;
3. judge whether interconnection switch of this switch;
4. fault initiating condition;
5. process of fault isolation;
6. failover procedure;
7. the processing after the fault.
Concrete, its detailed step is as follows:
1. initialization:
Obtain in this unit and and this unit adjacent switch, the direct parameter information of the DG of access.
2. calculate the load of feeder line section:
The load that calculates each feeder line section is to provide when recovering to turn for foundation;
In the actual module, load is weighed with electric current;
Each switch during according to day-to-day operation state oneself rated current is set;
The load value that utilizes during fault recovery is the load value before the fault, and desirable trend calculated value replaces in simulated program.
Above-mentioned steps and logical relation are as shown in Figure 2.
3. searching interconnection switch:
Interconnection switch and outlet breaker are the starting points of recovering;
The calculating of interconnection switch regularly constantly repeats;
Consider to be the situation of outlet breaker simultaneously;
Consider the situation of many power supplys.
Above-mentioned steps and logical relation are as shown in Figure 3.
4. fault initiating condition:
Troubleshooting must have entry condition, otherwise switch closure, maintenance also can be processed as fault normally;
Fault from outlet breaker, is transmitted on off state and fault message after occuring backward, and switch is isolated successively, and the switch general who links to each other with distributed power source and the state of site switch are passed to the control unit of outlet breaker;
Entry condition: receive guard signal and minute state of outlet breaker, and this switch decompression, wait for a period of time (5S) guarantees that distributed power source is incorporated into the power networks.
Above-mentioned steps and logical relation are as shown in Figure 4.
5. Fault Isolation logic:
Details are as follows for isolation logic:
If a switch receives that fault message and self are in decompression state (switch that prevents from working is subject to the fault-signal tripping); Tripping switch then, simultaneously with the fault message to the next stage transmission.
If this switch failure namely can not tripping, be recorded as minute state of refusing, will refuse a minute state notifying proximity switch.
If the communication of the switch of next stage is unsuccessful, the not smooth switch of communication is arranged around the record.
From isolation processes, from outlet breaker, before interconnection switch, the successively tripping of all switches.
6. fault recovery logic:
Details are as follows for recovery algorithms:
Recovery process from outlet breaker and interconnection switch simultaneously.
A, for outlet breaker and interconnection switch:
If switch of A1 is outlet breaker:
The switch (being that short circuit occurs in breaker outgoing line one side) that does not have overcurrent on every side, then circuit breaker can be not closed;
The switch that overcurrent is arranged on every side, and cut-off switch (preventing looped network) is arranged on every side, then circuit breaker is understood closure, moves and successfully notifies afterwards proximity switch;
If switch of A2 is interconnection switch:
The switch (being that short circuit occurs in interconnection switch one side) that overcurrent is arranged on every side, then interconnection switch keeps separating brake;
The switch that does not have overcurrent on every side, and cut-off switch (preventing looped network) is arranged on every side, then interconnection switch can be closed, the backward outlet breaker direction notice of success proximity switch;
B, for other switch:
If a switch success tripping receives that adjacent switch successfully recovers message, then enters recovery process;
The switch (preventing from causing operation with closed ring after switch from closing) that disconnection is arranged around the switch, this is as the decompression switch and do not have overcurrent, if be all on every side decompression but not excess flow switch or two excess flow switchs are arranged or this switch this as the end switch that directly connects load, then this switch can be closed;
The switch (preventing from causing operation with closed ring after switch from closing) that disconnection is arranged around the switch, but this is as decompression switch overcurrent, if two excess flow switchs are arranged on every side; Then this switch can be closed, otherwise keep separated position;
Must notify switch on every side when each switch closes a floodgate, prevent the cyclization operation, consider the load transfer ability of opposite end power supply;
Abnormal conditions are processed:
C, switch " refuse minute " situation analysis:
If switch itself is refused switch-dividing, operation troubles is recovered logic, determines oneself to want the action finished, then will refuse minute information and want that the action of finishing passes to adjacent switch;
Switch-dividing is refused in the adjacent existence of switch, receives restoring signal, satisfies the combined floodgate condition, and
Refusing switch-dividing itself needs to close a floodgate, and then this switch is carried out " closure " operation;
Refusing switch-dividing itself needs tripping operation, and then this switch is carried out the "off" operation;
D, switch are refused to close and the not smooth situation analysis of communicating by letter:
Refuse combination switch owing to can not be closed, therefore restoring signal can not be transmitted towards periphery, this side recovery process finishes;
If the not smooth switch of communication is arranged on every side, then on off state remains unchanged.
For the zone of dead electricity before the fault, can not change in the troubleshooting, for example in situation shown in Figure 5, b, c switch remain on " separating brake " state before the fault, can not close a floodgate in the recovery process after fault, close a floodgate under the inspecting state preventing.
If satisfy the condition that is incorporated into the power networks, the distributed electrical source automatic carries out " simultaneous interconnecting " operation.Its auto-parallel condition is the condition that is incorporated into the power networks of conventional grid generation equipment, belongs to the routine techniques means, no longer narrates at this.
Because technical scheme of the present invention realizes including Fault Isolation and the recovery process of the power distribution network of osmotic formula power supply based on intelligent distributed feeder automation pattern, intelligent degree is high in its fault eliminating and the recovery process, swift with judgement, accurately, logical condition can be made amendment and replenishes according to the real topology of electrical network, whole control model is based on existing equipment, be not subjected to again the restriction of existing equipment, continuous upgrading along with intelligent grid equipment, control strategy can constantly be adjusted and replenish, for scheduling and the operational management of the power distribution network that includes distributed power source provides assurance.
The present invention can be widely used in scheduling, operational management and the fault emergency processing field of intelligent grid.
Claims (8)
1. distribution network failure isolation and a restoration methods that realizes osmotic formula power supply comprises Fault Isolation and the recovery of power distribution network, it is characterized in that:
1-1) described distribution network failure isolation and restoration methods realize the distribution network failure isolation of osmotic formula power supply based on intelligent distributed feeder automation pattern and recover;
1-2) after satisfied " fault initiating " condition, each FA intelligence substation controller is formed a formation carry out continuous monitoring, and share voltage, the position of the switch, the malfunction of feeder line, the information such as access state of distributed power source between each FA intelligence substation controller;
1-3) the place feeder switch controller that breaks down carries out fault and judges that the switch before and after the fault point is carried out " tripping operation " and moved, thereby fault is excised automatically after learning coherent signal;
1-4) by the peer to peer communication between the controller of each FA intelligence substation, other switch obtains the information of having excised about which switch in the group;
1-5) according to Fault Isolation logic and fault recovery logic, each switch will be according to own position in feeder line, and whether decision carries out " closure " operation automatically, recovers rapidly the normal interval power supply of this circuit by " recovery process ";
If 1-6) satisfy the condition that is incorporated into the power networks, the distributed electrical source automatic carries out " simultaneous interconnecting " operation;
1-7) carry out the post-fault operation.
2. isolate and restoration methods according to the distribution network failure of realization osmotic formula power supply claimed in claim 1; described " fault initiating " condition that it is characterized in that is relay protection signal and " separating brake " status signal that receives outlet breaker; and this switch is in " decompression " state; wait for very first time set point, guarantee that distributed power source is incorporated into the power networks.
3. according to distribution network failure isolation and the restoration methods of realization osmotic formula power supply claimed in claim 2, it is characterized in that described very first time set point is 5 seconds.
4. isolate and restoration methods according to the distribution network failure of realization osmotic formula power supply claimed in claim 1, it is characterized in that after fault occurs, described FA intelligence substation controller is from outlet breaker, on off state and fault message are notified to related switch, determine abort situation by the place controller, fault point front-rear switch isolation, the state of the switch that links to each other with distributed power source general and site switch is passed to the control unit of outlet breaker.
5. according to the isolation of the distribution network failure of realization osmotic formula power supply claimed in claim 1 and restoration methods, it is characterized in that described peer to peer communication realizes by communication network and the position of the switch state message of each FA intelligence substation controller.
6. according to distribution network failure isolation and the restoration methods of realization osmotic formula power supply claimed in claim 1, it is characterized in that described Fault Isolation logic is
If 6-1) switch receives that fault message and self are in " decompression " state, tripping switch then, simultaneously with the fault message to the next stage transmission;
6-2) from outlet breaker, before interconnection switch, the successively tripping of all switches.If 6-3) this switch failure can not tripping, be recorded as " refuse minute " state, will " refuse minute " state notifying proximity switch, troubleshooting stops;
If 6-4) communication of the switch of next stage is unsuccessful, the not smooth switch of communication is arranged around the record, troubleshooting stops.
7. according to the isolation of the distribution network failure of realization osmotic formula power supply claimed in claim 1 and restoration methods, it is characterized in that described recovery process from outlet breaker and interconnection switch simultaneously; Described fault recovery logic is
7-1) for outlet breaker and interconnection switch:
If switch of A is outlet breaker, there is not the switch of overcurrent on every side, then outlet breaker is closed;
The switch that overcurrent is arranged on every side, and cut-off switch is arranged on every side, then circuit breaker is understood closure, moves and successfully notifies afterwards proximity switch;
If switch of B is interconnection switch, the switch of overcurrent is arranged on every side, then interconnection switch keeps separating brake;
The switch that does not have overcurrent on every side, and cut-off switch is arranged on every side, then interconnection switch can be closed, the backward outlet breaker direction notice of success proximity switch;
7-2) for other switch:
If a switch success tripping receives that adjacent switch successfully recovers message, then enters recovery process;
The switch that disconnection is arranged around the switch, this is as the decompression switch and do not have overcurrent, if be all on every side decompression but not excess flow switch or two excess flow switchs are arranged or this switch this as the end switch that directly connects load, then this switch can be closed;
The switch that disconnection is arranged around the switch, but this is as decompression switch overcurrent, if two excess flow switchs are arranged on every side; Then this switch can be closed, otherwise keep separated position;
When closing a floodgate, each switch must notify switch on every side, to prevent the cyclization operation.
8. according to the isolation of the distribution network failure of realization osmotic formula power supply claimed in claim 1 and restoration methods, it is characterized in that the described condition of being incorporated into the power networks is the conventional grid generation equipment condition that is incorporated into the power networks.
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| CN201210529130.5A CN103022994B (en) | 2012-12-10 | 2012-12-10 | Method for achieving fault isolation and recovery of power distribution network with permeability distribution type power supply |
| PCT/CN2013/076697 WO2014089958A1 (en) | 2012-12-10 | 2013-06-04 | Distribution network failure isolation and recovery method realizing penetration distributed generation |
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| CN201210529130.5A CN103022994B (en) | 2012-12-10 | 2012-12-10 | Method for achieving fault isolation and recovery of power distribution network with permeability distribution type power supply |
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