CN104113048A - Intelligent protection system of distribution network - Google Patents
Intelligent protection system of distribution network Download PDFInfo
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- CN104113048A CN104113048A CN201410287686.7A CN201410287686A CN104113048A CN 104113048 A CN104113048 A CN 104113048A CN 201410287686 A CN201410287686 A CN 201410287686A CN 104113048 A CN104113048 A CN 104113048A
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Abstract
The invention, which belongs to the technical field of automation of the distribution network, relates to an intelligent protection system of distribution network. According to the invention, the system comprises at least two section switches installed at a distribution line and matched intelligent protection terminals, a communication system and a distribution network automation system platform. According to the system, non-level different current protection is used; and thus the current protection tripping time setting values of all section switches are identical. The intelligent protection terminals identify the supervisor-subordinate relation of all intelligent protection terminals according to a network topological relation file. When a fault occurs at the distribution line, tripping of the corresponding section switch is carried out, the faulty line section is isolated, and the non-fault line section carries out operation continuously; and power supplying of the non-fault section behind the fault point is recovered by a connecting switch of another distribution line. Therefore, the line fault power-failure range can be reduced; power supply reliability of the distribution network is improved; and secure operation of the power system is guaranteed.
Description
Technical field
The present invention relates to a kind of power distribution network intelligent protection system, belong to distribution network automated technical field.
Background technology
Along with development and the growth in the living standard in epoch, user is more and more higher to the requirement of power supply quality and reliability, and distribution network automated is the new technique of electric power application in recent years, relates generally to Medial & Low Voltage Power Network.Countries in the world are all very paid close attention to this at present, and constantly exploring, distribution network automated pilot work has been carried out in the many areas of China in different levels, different scales in recent years, the scheme adopting at present is mainly divided into Japanese and European, the Fault Isolation mode of distribution line is current mode or voltage-type, and during fault, switch protection action tripping operation is protected by transformer station, and circuit has a power failure completely, adopt reset mode piecemeal to determine fault coverage, isolated fault, recover the power supply of non-fault zone.
Chinese patent 201310079399.2 < < power distribution network locality protection method and system > > of existing distribution network automated technology, has the following disadvantages:
One, the installation limited amount of line sectionalizing switch is general≤3;
Two, respectively protect terminal protection definite value different, by the differential selectivity that realizes protection actions at different levels;
Three, the block switch protection action tripping operation isolated fault time is longer; general operate time >=100 millisecond; when block switch quantity >=2; cannot coordinate with outlet switch fast tripping protection time definite value in transformer station; realize the selectivity of protection action; when line fault, may occur that outlet switch and block switch in transformer station all protect the phenomenon of action tripping operation.
Summary of the invention
The object of this invention is to provide a kind of power distribution network intelligent protection system, to realize the selectivity tripping operation of distribution network failure, the reliable isolation of fault section.
The present invention provides a kind of power distribution network intelligent protection system for solving the problems of the technologies described above; comprise at least two section breakers and supporting intelligent protection terminal and the distribution automation system platform that are arranged on distribution line; each intelligent protection terminal room and and distribution automation system platform between by fiber optic network, communicate to connect; the current protection trip time setting value of each described section breaker is identical, and this system adopts stepless spill current protection.
The described protective current definite value that is arranged on each section breaker on same distribution line is identical; be that current ration and time definite value are all consistent; and time definite value can 0～99s between value; for the selectivity that coordinates, realizes protection action satisfied and transformer station's distribution line gate out switch protection; it is 0s that the present invention protects the time definite value of employing, protects setting time without time delay.
Described distribution automation system platform is for creating topological relation file according to the operational mode of current distribution network, and topological relation file is sent to each intelligent protection terminal, described intelligent protection terminal is according to the relationship between superior and subordinate of each intelligent protection terminal of network topology file identification, when the distribution network line fault that is short-circuited, when line current is greater than current quick definite value, subordinate's intelligent protection terminal of fault rear end sends fault message without time delay to all higher level's intelligent protection terminals, each intelligent protection terminal is analyzed judgement according to the fault message and the superior and the subordinate's logical relation that receive, make the intelligent protection terminal tripping operation of faulty section adjacent headend, to realize, in minimum interval, excise fault, isolated fault section circuit.
Between described distribution line, be also provided with interconnection switch, while normally moving, each distribution line open loop operation.If network configuration changes; when on circuit, block switch, interconnection switch state need change; need corresponding block switch disconnection, interconnection switch to close a floodgate; by distribution automation system platform, again to each intelligent protection terminal, issue power network topology relational file one time; after 2s, switch changes at the location status of network, and distribution network can move under new electric network composition.
Describedly break down and realize after fault section isolation when distribution line, main website judges operation of power networks situation, the section breaker of rear end, disjunction fault point, and the interconnection switch that closes, the non-fault section of rear end, fault point restores electricity by another distribution line.
The described communicating interrupt when intelligent protection terminal, when the distribution line at its place breaks down, intelligent protection terminal automatic decision, disconnects corresponding block switch, isolation circuit fault section.
Describedly break down when distribution line, during the switch failure of corresponding intelligent protection terminal, its higher level's intelligent protection terminal is protected in support.
The invention has the beneficial effects as follows: the intelligent protection terminal configuration current protection of the present invention's each block switch in power distribution network backbone Huo great branch, and protect definite value identical everywhere, each intelligent protection terminal is communicated by letter by fiber cluster, synchronized sampling, the selectivity of corresponding segment switch tripping operation while realizing distribution line failure, isolated fault section circuit, non-faulty section circuit continues operation; When distribution line has ring network power supply circuit, during fault after corresponding segment switch trip, isolated fault section circuit, loop grid interconnection switch overlaps the non-faulty section of this circuit is restored electricity, reduce line outage scope, improve the power supply reliability of distribution network, guarantee safe operation of power system.
Accompanying drawing explanation
Fig. 1 is the power distribution network intelligent protection system pie graph in the embodiment of the present invention one;
Fig. 2 is the power distribution network intelligent protection system pie graph in the embodiment of the present invention two;
Fig. 3 is the topological relation document creation flow chart that the present invention adopts;
Fig. 4 is that topological relation file of the present invention issues program flow diagram.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is further described.
Embodiment mono-
In this enforcement, power distribution network intelligent protection system as shown in Figure 1, comprise substation bus bar 1, circuit outlet switch 2, distribution line 3, block switch 4 (1#, 2#, 3#), large branch switch 5, distribution automation system platform 6, fiber optic network 7 and intelligent protection terminal (FTU) 8 (1#, 2#, 3#, 4#), block switch 4 (1#, 2#, 3#) be arranged on distribution line 3, large branch switch 5 is arranged on branched line, block switch 4 (1#, 2#, 3#) with large branch switch 5 difference corresponding intelligent protection terminal (FTU) 8 (1#, 2#, 3#, 4#), block switch 4 (1#, 2#, 3#) identical with the current quick-breaking definite value of large branch switch 5, current quick definite value is while there is two-phase short-circuit fault under the minimum operational mode of block switch installation place, protective device energy action message.
Each intelligent protection terminal room and and 6, distribution automation system platform be all to communicate to connect by fiber optic network 7, each intelligent protection terminal 8 disposes corresponding optical fiber ring network switch, between adjacent switch, with optical fiber, be connected, form optical-fibre communications looped network, a node of optical-fibre communications looped network is arranged to host exchange in transformer station, host exchange by electricity mouthful be connected with the switch of distribution automation system platform 6, the various feeder line data of intelligent protection terminal collection enter and distribution automation system platform 6 by optical fiber ring network, by distribution automation system platform 6, processed, analyze, show, distribution automation system platform 6 is for creating topological relation file according to the operational mode of current distribution network, and topological relation file is sent to each intelligent protection terminal 8 (1#, 2#, 3#, 4#), each intelligent protection terminal 8 (1#, 2#, 3#, 4#) according to the relationship between superior and subordinate of each intelligent protection terminal of network topology file identification, the FTU8 of subordinate (3#) timing superior FTU8 (2#) transmission information (electric current during normal work, voltage, on off state etc.), when the distribution network line fault that is short-circuited, when line current is greater than current quick definite value, subordinate's intelligent protection terminal of fault rear end sends fault message without time delay to all higher level's intelligent protection terminals, each intelligent protection terminal is analyzed judgement according to the fault message and the superior and the subordinate's logical relation that receive, make the intelligent protection terminal tripping operation of faulty section adjacent headend, to realize, in minimum interval, excise fault, isolated fault section circuit.Wherein as shown in Figure 3, topological relation file issues process as shown in Figure 4 to topological relation document creation process, is not describing in detail here.
Operation principle and the process of this system are as follows: when distribution line L2 place is short-circuited fault, intelligent protection terminal (FTU) 8 (1#, 2#) fault current all detected, and the later subordinate's intelligent protection terminal 8 (3#) in fault point without time delay to all higher level's intelligent protection terminals (FTU) 8 (1#, 2#) send fault-free current information, FTU8 (1#, 2#) according to the fault message receiving and the superior and the subordinate's logical relation, analyze judgement, block switch 4 (2#) action tripping operation by fault point adjacent headend, in minimum interval, excise fault, isolated fault section circuit, non-faulty section circuit continues operation.When distribution line L4 place is short-circuited fault: intelligent protection terminal (FTU) 8 (1#, 2#, 4#) all detects fault current; 4# intelligent protection terminal (FTU) 8 is end; without child node; FTU8 (1#, 2#, 4#) analyzes judgement according to the fault message receiving and the superior and the subordinate's logical relation; large branch segment switch 5 action tripping operations by fault point adjacent headend; by its back segment excision fault, isolated fault section circuit, non-faulty section circuit continues operation.
Embodiment bis-
As shown in Figure 2, in the present embodiment, intelligent distribution network adopts loop grid, and its protection system comprises substation bus bar 1 (1#, 2#), circuit outlet switch 2 (1#, 2#), distribution line 3, block switch 4 (1#, 2#, 3#, 4#), interconnection switch 5, distribution automation system platform 6, fiber optic network 7, intelligent protection terminal (FTU) 8 (1#, 2#, 3#, 4#) with intelligent protection terminal 9, intelligent protection terminal (FTU) 8 (1#, 2#, 3#, 4#) be arranged on respectively block switch 4 (1#, 2#, 3#, 4#), intelligent protection terminal 9 is arranged in interconnection switch 5, and each intelligent protection terminal is for gathering the information of corresponding switch, block switch 4 (1#, 2#) be arranged on the distribution line of the 1# of transformer station bus block switch 4 (3#, 4#) be arranged on the distribution line 3 of the 2# of transformer station bus, interconnection switch 5 is arranged on the junction of the distribution line of 1# substation bus bar and the distribution line of 2# substation bus bar, block switch 4 (1#, 2#, 3#, 4#) identical with the current quick-breaking definite value of interconnection switch 5.Each intelligent protection terminal (FTU) 8 (1#, 2#, 3#, 4#) and and intelligent protection terminal 9 and 6, distribution automation system platform be all to communicate to connect by fiber optic network 7, each intelligent protection terminal 8 (1#, 2#, 3#, 4#) all dispose corresponding optical fiber ring network switch with intelligent protection terminal 9, between adjacent switch, with optical fiber, be connected, form optical-fibre communications looped network, form optical-fibre communications looped network and be connected with the switch of distribution automation system platform 6, the various feeder line data of intelligent protection terminal collection enter and distribution automation system platform 6 by optical fiber ring network, and 6 pairs of information that receive of distribution automation system platform are processed, analyze, show, distribution automation system platform 6 creates topological relation file according to the operational mode of current distribution network, and topological relation file is sent to each intelligent protection terminal 8 (1#, 2#, 3#, 4#) with 9, each intelligent protection terminal 8 (1#, 2#, 3#, 4#) He 9 according to the relationship between superior and subordinate of each intelligent protection terminal of network topology file identification, the FTU8 of subordinate (2# while normally working, 3#) timing superior FTU8 (1#, 4#) transmission information (electric current, voltage, on off state etc.), when the distribution network line fault that is short-circuited, when line current is greater than current quick definite value, subordinate's intelligent protection terminal of fault rear end sends fault message without time delay to all higher level's intelligent protection terminals, each intelligent protection terminal is analyzed judgement according to the fault message and the superior and the subordinate's logical relation that receive, make the intelligent protection terminal tripping operation of faulty section adjacent headend, to realize in minimum interval, excise fault, isolated fault section circuit.Wherein as shown in Figure 3, topological relation file issues process as shown in Figure 4 to topological relation document creation process, is not describing in detail here.
When distribution line L2 place is short-circuited fault: intelligent protection terminal (FTU) 8 (1#, 2#) all detects fault current; the network topology structure file being issued from distribution automation system platform 6; 2# intelligent protection terminal (FTU) 8 is end; without child node; FTU8 (1#, 2#) analyzes judgement according to the fault message receiving and the superior and the subordinate's logical relation; block switch 4 (2#) action tripping operation by fault point adjacent headend; isolated fault section L2 circuit; non-faulty section L1 circuit continues operation; now interconnection switch is failure to actuate, not reconstruct of network.
When distribution line L2 place is short-circuited fault and fiber optic network L1/ place fault: 2# intelligent protection terminal (FTU) 8 is by the fiber optic network (L2 of opposite side
/) with 8 contacts of backstage and 1# intelligent protection terminal (FTU), logic judgement and accident analysis be with above-mentioned 1, still by block switch 4 (2#) the action tripping operation of fault point adjacent headend, isolated fault section L2 circuit, non-faulty section L1 circuit continues operation.Now interconnection switch is failure to actuate, not reconstruct of network.That is: can pass through opposite side fiber optic network and other intelligent protection terminal and background system combined network communication during 2# intelligent protection terminal one sided network fault; do not affect the action of uploading in real time and protecting of data; this protection terminal still can action message, makes this section block switch separating brake, isolated fault.
When distribution line L2 place is short-circuited fault, 2# intelligent protection terminal (FTU) 8 protection fault tripping: the relevant information that the fault current that 1# intelligent protection terminal (FTU) 8 bases detect, the network topology structure file that distribution automation system platform 6 issues and 2# intelligent protection terminal (FTU) 8 are uploaded; after the time delay through 60ms is waited for; by block switch 4 (1#) action tripping operation, isolation L1, L2 section circuit.Now interconnection switch is failure to actuate, not reconstruct of network.
When the distribution line L2 place fault that is short-circuited, the equal fault of fiber optic network of 1# intelligent protection terminal (FTU) 8 both sides becomes communication " isolated island ", and during 2# intelligent protection terminal (FTU) 8 protection fault tripping: 1# intelligent protection terminal (FTU) 8 can detect fault current, but due to its both sides fiber optic network fault, cannot with backstage and 2# intelligent protection terminal (FTU) 8 communication contacts, because of 2# intelligent protection terminal (FTU) 8 protection fault trippings, fault current exists always, 1# intelligent protection terminal (FTU) 8 is being tripped by block switch 4 (1#) action after 10ms time delay, isolation L1, L2 section circuit.Now interconnection switch is failure to actuate, not reconstruct of network.That is: when faulty section intelligent protection terminal protection tripping and higher level protect terminal two side optical fibers to be broken as communication " isolated island "; line fault electric current exists always; now only " isolated island " protection terminal block switch action tripping operation, isolated fault after 10ms time delay, the adjacent higher level's intelligent protection of faulty section non-" isolated island " terminal is failure to actuate.
When distribution line L1 place is short-circuited fault: intelligent protection terminal (FTU) 8 (1#) detects fault current; and the later subordinate's intelligent protection terminal 8 (2#) in fault point sends fault-free current information without time delay to all higher level's intelligent protection terminals (FTU) 8 (1#); FTU8 (1#) analyzes judgement according to the fault message receiving and the superior and the subordinate's logical relation; block switch 4 (1#) action tripping operation by fault point adjacent headend; isolated fault section L1 circuit, non-fault section L2 circuit dead electricity.After this, intelligent protection terminal (FTU) 9, according to the information and the network topology analysis that receive, meets after the condition same period, and interconnection switch 5 is closed a floodgate in time delay, by another power supply, to non-fault section L2 line powering, realizes network reconfiguration function.
If network configuration changes, block switch on circuit, when interconnection switch state need change: as block switch 4 (2#) changes to interconnection switch, interconnection switch 5 changes to block switch, need a block switch 4 (2#) to disconnect, interconnection switch 5 closes a floodgate, by distribution automation system platform 6, re-issue topological structure of electric file one time, do not need to change the intelligent protection terminal of two switches and revise protection definite value, the change that after 2s, switch occurs at the location status of network, now 4 (2#) switch is interconnection switch, 5 switches become block switch, distribution network can move under new electric network composition.
Claims (7)
1. a power distribution network intelligent protection system; comprise at least two section breakers and supporting intelligent protection terminal and the distribution automation system platform that are arranged on distribution line; each intelligent protection terminal room and and distribution automation system platform between by fiber optic network, communicate to connect; it is characterized in that; the current protection trip time setting value of each described section breaker is identical, and this system adopts stepless spill current protection.
2. power distribution network intelligent protection system according to claim 1, is characterized in that, described in to be arranged on the protective current definite value of each section breaker on same distribution line identical.
3. power distribution network intelligent protection system according to claim 2, it is characterized in that, described distribution automation system platform is for creating topological relation file according to the operational mode of current distribution network, and topological relation file is sent to each intelligent protection terminal, described intelligent protection terminal is according to the relationship between superior and subordinate of each intelligent protection terminal of network topology file identification, when the distribution network line fault that is short-circuited, when line current is greater than current quick definite value, subordinate's intelligent protection terminal of fault rear end sends fault message without time delay to all higher level's intelligent protection terminals, each intelligent protection terminal is analyzed judgement according to the fault message and the superior and the subordinate's logical relation that receive, make the intelligent protection terminal tripping operation of faulty section adjacent headend, to realize, in minimum interval, excise fault, isolated fault section circuit.
4. power distribution network intelligent protection system according to claim 3, is characterized in that, is also provided with interconnection switch between described distribution line, while normally moving, and each distribution line open loop operation.
5. power distribution network intelligent protection system according to claim 4; it is characterized in that; describedly break down and realize after fault section isolation when distribution line; main website judges operation of power networks situation; the section breaker of rear end, disjunction fault point; the interconnection switch that closes, the non-fault section of rear end, fault point restores electricity by another distribution line.
6. power distribution network intelligent protection system according to claim 5, is characterized in that, the described communicating interrupt when intelligent protection terminal; when the distribution line at its place breaks down; intelligent protection terminal automatic decision, disconnects corresponding block switch, isolation circuit fault section.
7. according to the power distribution network intelligent protection system described in any one in claim 1-6, it is characterized in that, describedly break down when distribution line, during the switch failure of corresponding intelligent protection terminal, its higher level's intelligent protection terminal is protected in support.
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| CN104518488B (en) * | 2014-12-30 | 2017-06-23 | 广西大学 | For the load point fault zone Type division method of distribution network reliability analysis |
| CN104701825A (en) * | 2015-03-11 | 2015-06-10 | 国家电网公司 | Quick protection method applicable to intelligent distribution network |
| CN104701825B (en) * | 2015-03-11 | 2018-05-25 | 国家电网公司 | A kind of fast protection method suitable for intelligent distribution network |
| CN105337269B (en) * | 2015-11-27 | 2018-03-23 | 国家电网公司 | A kind of device method for information interaction between towards the locality protection based on communication |
| CN105337269A (en) * | 2015-11-27 | 2016-02-17 | 国家电网公司 | Information interaction method between devices orienting to communication-based regional protection |
| CN105470933A (en) * | 2015-11-27 | 2016-04-06 | 宁波三星医疗电气股份有限公司 | DTU protection algorithm for power distribution network with accessed distributed power sources |
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