CN104113048B - A kind of power distribution network intelligent protection system - Google Patents

A kind of power distribution network intelligent protection system Download PDF

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Publication number
CN104113048B
CN104113048B CN201410287686.7A CN201410287686A CN104113048B CN 104113048 B CN104113048 B CN 104113048B CN 201410287686 A CN201410287686 A CN 201410287686A CN 104113048 B CN104113048 B CN 104113048B
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China
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intelligent protection
distribution
terminal
protection terminal
network
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CN201410287686.7A
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Chinese (zh)
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CN104113048A (en
Inventor
杨明乾
姜俊莉
张明
王勇焕
秦文杰
时振堂
黄长明
李林卿
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中国石油化工股份有限公司
中国石化集团河南石油勘探局水电厂
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Priority to CN201410287686.7A priority Critical patent/CN104113048B/en
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Abstract

The present invention relates to a kind of power distribution network intelligent protection system, belong to distribution network automated technical field.The present invention includes at least two block switches being arranged on distribution line and supporting intelligent protection terminal; communication system and distribution automation system platform; the system is protected using stepless spill current, i.e., the current protection trip time setting valve of each block switch is identical;Intelligent protection terminal is according to the relationship between superior and subordinate of each intelligent protection terminal of network topology file identification, and when distribution line failure, corresponding segment switch trip isolates circuit fault section, and circuit non-faulting section continues to run with;The non-faulting section of trouble point rear end is restored electricity by the interconnection switch of another distribution line, to reduce line outage scope, is improved the power supply reliability of distribution network, is ensured safe operation of power system.

Description

A kind of power distribution network intelligent protection system
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
With the development and growth in the living standard in epoch, user to power supply quality and the requirement more and more higher of reliability, Distribution network automated is the new technique of electric power application in recent years, relates generally to Medial & Low Voltage Power Network.At present countries in the world to this all Extremely pay close attention to, and explored constantly, many areas in China have carried out distribution in different levels, different scales in recent years The pilot work of automation, the scheme used at present are broadly divided into Japanese and European, and the Fault Isolation mode of distribution line is Current mode or voltage-type, switch protection action tripping operation is protected by transformer station during failure, and circuit is completely had a power failure, determined using piecewise reset mode Fault coverage, isolated fault, recover non-faulting block supply.
The Chinese patent 201310079399.2 of existing distribution network automated technology《A kind of power distribution network locality protection method And system》, have the following disadvantages:
First, the installation number of line sectionalizing switch is limited, general≤3;
2nd, respectively protection terminal protection definite value is different, by the differential selectivity for realizing protection acts at different levels;
3rd, the block switch protection act tripping operation isolated fault time is longer, general actuation time >=100 millisecond, works as segmentation During number of switches >=2, it can not coordinate with outlet switch fast tripping protection time definite value in transformer station, realize the selection of protection act Property, when line fault, in fact it could happen that outlet switch and the phenomenon of the equal protection act tripping operation of block switch in transformer station.
The content of the invention
It is an object of the invention to provide a kind of power distribution network intelligent protection system, to realize that the selectivity of distribution network failure is jumped Lock, the reliable isolation of fault section.
The present invention provides a kind of power distribution network intelligent protection system to solve above-mentioned technical problem, including installed in distribution wire At least two section breakers and supporting intelligent protection terminal and distribution automation system platform on road, each intelligent protection are whole Communicated to connect between end and its between distribution automation system platform by fiber optic network, the electric current of described each section breaker Trip protection time setting value is identical, and the system is protected using stepless spill current.
The protective current definite value of each section breaker being arranged on same distribution line is identical, i.e. current ration And time definite value is consistent, and time definite value can value between 0~99s, to meet to protect with transformer station distribution line gate out switch Cooperation, realize the selectivity of protection act, the time definite value that present invention protection uses is 0s, i.e. the protection seting time is without prolonging When.
The distribution automation system platform is used to create topological relation file according to the method for operation of current power distribution network, And topological relation file is sent to each intelligent protection terminal, the intelligent protection terminal is according to network topology file identification The relationship between superior and subordinate of each intelligent protection terminal, when short trouble occurs for distribution network line, line current is more than current quick During definite value, subordinate's intelligent protection terminal of failure rear end is no-delay to send fault message to all higher level's intelligent protection terminals, respectively Intelligent protection terminal carries out analysis judgement according to the fault message and the superior and the subordinate's logical relation that receive, makes faulty section adjacent headend Intelligent protection terminal tripping operation, with realize minimum section in cut off failure, isolated fault section circuit.
It is additionally provided with interconnection switch between described distribution line, during normal operation, each bar distribution line open loop operation.If Network structure changes, and when block switch, interconnection switch state need to change on circuit, then needs corresponding block switch to break Open, interconnection switch combined floodgate, a power grid topological relation is issued to each intelligent protection terminal from distribution automation system platform again File, switch is changed in the location status of network after 2s, and distribution network can be run under new electric network composition.
It is described after distribution line breaks down and realizes fault section isolation, main website is sentenced to operation of power networks situation Disconnected, the section breaker of disjunction trouble point rear end closes interconnection switch, and the non-faulting section of trouble point rear end passes through another distribution Circuit restores electricity.
It is described when the communicating interrupt of intelligent protection terminal, when the distribution line where it breaks down, intelligent protection terminal Automatic decision, corresponding block switch is disconnected, isolate circuit fault section.
It is described when distribution line breaks down, during the switch failure of corresponding intelligent protection terminal, its higher level's intelligent protection Terminal is as back-up protection.
The beneficial effects of the invention are as follows:The intelligent protection of the present invention each block switch on power distribution network backbone or big branch Terminal configures current protection, and protection definite value is identical everywhere, and each intelligent protection terminal is communicated by fiber cluster, synchronized sampling, The selectivity tripping operation of corresponding block switch during distribution line failure, isolated fault section circuit are realized, non-faulting section circuit continues Operation;When distribution line has ring network power supply circuit, during failure after corresponding block switch tripping operation, isolated fault section circuit, Loop grid interconnection switch overlaps and the circuit non-faulting section is restored electricity, and reduces line outage scope, improves power distribution network The power supply reliability of network, ensure safe operation of power system.
Brief description of the drawings
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 uses;
Fig. 4 is that topological relation file of the present invention issues program flow diagram.
Embodiment
The embodiment of the present invention is further described below in conjunction with the accompanying drawings.
Embodiment one
Power distribution network intelligent protection system in this implementation is as shown in figure 1, including substation bus bar 1, circuit outlet switch 2, match somebody with somebody Electric line 3, block switch 4 (1#, 2#, 3#), big branch switch 5, distribution automation system platform 6, fiber optic network 7 and intelligence are protected Terminal (FTU) 8 (1#, 2#, 3#, 4#) is protected, block switch 4 (1#, 2#, 3#) is arranged on distribution line 3, and big branch switch 5 is set Put on branched line, block switch 4 (1#, 2#, 3#) and big branch switch 5 correspond to respectively intelligent protection terminal (FTU) 8 (1#, 2#, 3#, 4#), block switch 4 (1#, 2#, 3#) is identical with the current quick-breaking definite value of big branch switch 5, current quick definite value During for two-phase short-circuit fault occurring under the minimum operational mode of block switch installation place, protection device energy action message.
Each intelligent protection terminal room and its between distribution automation system platform 6 communicated to connect by fiber optic network 7, Each intelligent protection terminal 8 is equipped with corresponding optical fiber ring network interchanger, is connected between adjacent interchanger with optical fiber, group Into optical-fibre communications looped network, a node of optical-fibre communications looped network is arranged to host exchange in transformer station, and host exchange passes through electricity Mouthful with and the interchanger of distribution automation system platform 6 be connected, the various feeder line data that intelligent protection terminal gathers pass through light Fine looped network enters and distribution automation system platform 6, is handled, analyzes, shows by distribution automation system platform 6, distribution is automatic Change system platform 6 to be used to create topological relation file according to the method for operation of current power distribution network, and topological relation file is sent out Each intelligent protection terminal 8 (1#, 2#, 3#, 4#) is sent to, each intelligent protection terminal 8 (1#, 2#, 3#, 4#) is according to network topology The relationship between superior and subordinate of each intelligent protection terminal of file identification, subordinate FTU8 (3#) timing superior FTU8 (2#) hairs during normal work Deliver letters breath (electric current, voltage, on off state etc.), when short trouble occurs for distribution network line, line current is more than current quick-breaking guarantor When protecting definite value, subordinate's intelligent protection terminal of failure rear end is no-delay to send fault message to all higher level's intelligent protection terminals, Each intelligent protection terminal carries out analysis judgement according to the fault message and the superior and the subordinate's logical relation that receive, before making faulty section adjacent The intelligent protection terminal tripping operation at end, failure, isolated fault section circuit are cut off in the section of minimum to realize.Wherein topology is closed It is file creation process as shown in figure 3, topological relation file issues process as shown in figure 4, not being described in detail here.
The operation principle and process of the system are as follows:When short trouble occurring at distribution line L2, intelligent protection terminal (FTU) 8 (1#, 2#) detect fault current, and trouble point it is later subordinate's intelligent protection terminal 8 (3#) it is no-delay to all Higher level's intelligent protection terminal (FTU) 8 (1#, 2#) sends non-faulty current information, and FTU8 (1#, 2#) believes according to the failure received Breath and the superior and the subordinate's logical relation carry out analysis judgement, tripping operation are acted by the block switch 4 (2#) of trouble point adjacent headend, in minimum Section in cut off failure, isolated fault section circuit, non-faulting section circuit continues to run with.Short circuit occurs at distribution line L4 During failure:Intelligent protection terminal (FTU) 8 (1#, 2#, 4#) detects fault current, and 4# intelligent protections terminal (FTU) 8 is end Holding, no child node, then FTU8 (1#, 2#, 4#) carries out analysis judgement according to the fault message and the superior and the subordinate's logical relation received, By trouble point adjacent headend big branch segment switch 5 action tripping operation, by its back segment cut off failure, isolated fault section circuit, Non-faulting section circuit continues to run with.
Embodiment two
As shown in Fig. 2 intelligent distribution network uses loop grid in the present embodiment, it protects system to include 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#) and intelligent protection terminal 9, intelligence Protection terminal (FTU) 8 (1#, 2#, 3#, 4#) is separately mounted in block switch 4 (1#, 2#, 3#, 4#), and intelligent protection terminal 9 is pacified In interconnection switch 5, each intelligent protection terminal is used for the information for gathering relative inductive switch, and block switch 4 (1#, 2#) is arranged on On the distribution line of transformer station's 1# buses, block switch 4 (3#, 4#) is arranged on the distribution line 3 of transformer station's 2# buses, contact Switch 5 is arranged on the junction of the distribution line of 1# substation bus bars and the distribution line of 2# substation bus bars, block switch 4 (1#, 2#, 3#, 4#) is identical with the current quick-breaking definite value of interconnection switch 5.Each intelligent protection terminal (FTU) 8 (1#, 2#, 3#, 4#) Between and its between intelligent protection terminal 9 and distribution automation system platform 6 communicated to connect by fiber optic network 7, each Intelligent protection terminal 8 (1#, 2#, 3#, 4#) and intelligent protection terminal 9 are equipped with corresponding optical fiber ring network interchanger, adjacent It is connected between interchanger with optical fiber, forms optical-fibre communications looped network, form optical-fibre communications looped network and distribution automation system platform 6 Interchanger be connected, intelligent protection terminal collection various feeder line data pass through optical fiber ring network enter and distribution automation system Platform 6, distribution automation system platform 6 handled the information received, analyzed, shown, distribution automation system platform 6 Topological relation file is created according to the method for operation of current power distribution network, and topological relation file is sent to each intelligent protection end Hold 8 (1#, 2#, 3#, 4#) and 9, each intelligent protection terminal 8 (1#, 2#, 3#, 4#) and 9 each according to network topology file identification The relationship between superior and subordinate of intelligent protection terminal, subordinate FTU8 (2#, 3#) timing superior FTU8 (1#, 4#) sends letter during normal work Cease (electric current, voltage, on off state etc.), when short trouble occurs for distribution network line, line current is determined more than current quick During value, subordinate's intelligent protection terminal of failure rear end is no-delay to send fault message, each intelligence to all higher level's intelligent protection terminals Terminal can be protected to carry out analysis judgement according to the fault message and the superior and the subordinate's logical relation that receive, make faulty section adjacent headend Intelligent protection terminal is tripped, and failure, isolated fault section circuit are cut off in the section of minimum to realize.Wherein topological relation text Part creates process as shown in figure 3, topological relation file issues process as shown in figure 4, not being described in detail here.
When short trouble occurring at distribution line L2:Intelligent protection terminal (FTU) 8 (1#, 2#) detects failure electricity Stream, the network topology structure file issued from distribution automation system platform 6,2# intelligent protections terminal (FTU) 8 are end End, no child node, FTU8 (1#, 2#) carry out analysis judgement according to the fault message and the superior and the subordinate's logical relation received, by event Block switch 4 (2#) the action tripping operation of barrier point adjacent headend, isolated fault section L2 circuits, non-faulting section L1 circuits continue to transport OK, now interconnection switch is failure to actuate, and network does not reconstruct.
When failure at short trouble and fiber optic network L1/ occurs at distribution line L2:2# intelligent protections terminal (FTU) 8 Pass through the fiber optic network (L2 of opposite side/) got in touch with backstage and 1# intelligent protections terminal (FTU) 8, logic judgment and accident analysis With above-mentioned 1, tripping operation, isolated fault section L2 circuits, non-faulting section are still acted by the block switch 4 (2#) of trouble point adjacent headend L1 circuits continue to run with.Now interconnection switch is failure to actuate, and network does not reconstruct.I.e.:During 2# intelligent protection terminal one sided network failures The real-time upload of data can not be influenceed by opposite side fiber optic network and other intelligent protection terminals and background system combined network communication And the action of protection, the protection terminal remain to action message, make section block switch separating brake, the isolated fault.
When short trouble, the protection failure tripping of 2# intelligent protections terminal (FTU) 8 occurring at distribution line L2:1# intelligence The network topology structure file that protection terminal (FTU) 8 issues according to the fault current, the distribution automation system platform 6 that detect And the relevant information that 2# intelligent protections terminal (FTU) 8 uploads, after 60ms delay wait, moved by block switch 4 (1#) Trip, isolate L1, L2 section circuit.Now interconnection switch is failure to actuate, and network does not reconstruct.
At distribution line L2 occur short trouble, the both sides of 1# intelligent protections terminal (FTU) 8 the equal failure of fiber optic network into During to communicate " isolated island " and the protection failure tripping of 2# intelligent protections terminal (FTU) 8:1# intelligent protections terminal (FTU) 8 is detectable To fault current, but due to its both sides fiber optic network failure, can not with backstage and the communication contact of 2# intelligent protections terminal (FTU) 8, Because 2# intelligent protections terminal (FTU) 8 protects failure tripping, then fault current exists always, and 1# intelligent protections terminal (FTU) 8 exists Acted and tripped by block switch 4 (1#) after 10ms is delayed, isolate L1, L2 section circuit.Now interconnection switch is failure to actuate, network Do not reconstruct.I.e.:When faulty section intelligent protection terminal protection tripping and higher level protect the optical fiber of terminal two to be broken as communicating " isolated island " When, line fault electric current exists always, now only " isolated island " protect terminal after 10ms is delayed block switch action tripping operation, every From failure, the adjacent higher level's intelligent protection terminal of faulty section non-" isolated island " is failure to actuate.
When short trouble occurring at distribution line L1:Intelligent protection terminal (FTU) 8 (1#) detects fault current, and The later subordinate's intelligent protection terminal 8 (2#) in trouble point is no-delay to send nothing to all higher level's intelligent protection terminals (FTU) 8 (1#) Fault current information, FTU8 (1#) carries out analysis judgement according to the fault message and the superior and the subordinate's logical relation received, by failure Block switch 4 (1#) the action tripping operation of point adjacent headend, isolated fault section L1 circuits, non-faulting section L2 circuit dead electricity.This Afterwards, intelligent protection terminal (FTU) 9 after meeting same period condition, is delayed according to the information and Network topology that receive and opens contact Close 5 to close a floodgate, by another power supply to non-faulting section L2 line powerings, realize network reconfiguration function.
If network structure changes, when block switch, interconnection switch state need to change on circuit:Such as block switch 4 (2#) is changed to interconnection switch, interconnection switch 5 is changed to block switch, then needs a block switch 4 (2#) to disconnect, interconnection switch 5 Close a floodgate, a topological structure of electric file is re-issued by distribution automation system platform 6, be not required to change the intelligence guarantor of two switches Terminal and modification protection definite value are protected, the location status switched after 2s in network is the change of generation, and now 4 (2#) switches are contact Switch, 5 switches are changed into block switch, and distribution network can be run under new electric network composition.

Claims (6)

1. a kind of power distribution network intelligent protection system, including at least two block switches on distribution line and supporting Intelligent protection terminal and distribution automation system platform, each intelligent protection terminal room and its between distribution automation system platform Communicated to connect by fiber optic network, it is characterised in that the current protection trip time setting valve of each block switch is identical, and this is System is protected using stepless spill current;The distribution automation system platform is used to be created according to the method for operation of current power distribution network Topological relation file, and topological relation file is sent to each intelligent protection terminal, the intelligent protection terminal is opened up according to network The relationship between superior and subordinate that relational file identifies each intelligent protection terminal is flutterred, when distribution network line normal work, subordinate's intelligent protection Terminal timing superior intelligent protection terminal sends information;When short trouble occurs for distribution network line, line current is more than electric current During fast tripping protection definite value, subordinate's intelligent protection terminal of failure rear end is no-delay to send failure to all higher level's intelligent protection terminals Information, each intelligent protection terminal carry out analysis judgement according to the fault message and the superior and the subordinate's logical relation that receive, make faulty section The intelligent protection terminal tripping operation of adjacent headend, failure, isolated fault section circuit are cut off in the section of minimum to realize.
2. power distribution network intelligent protection system according to claim 1, it is characterised in that be arranged on same distribution line Each block switch current quick definite value it is identical.
3. power distribution network intelligent protection system according to claim 2, it is characterised in that also set between described distribution line It is equipped with interconnection switch, during normal operation, each bar distribution line open loop operation.
4. power distribution network intelligent protection system according to claim 3, it is characterised in that when distribution line break down and it is real After existing fault section isolation, main website is judged operation of power networks situation, the block switch of disjunction trouble point rear end, closes contact Switch, the non-faulting section of trouble point rear end are restored electricity by another distribution line.
5. power distribution network intelligent protection system according to claim 4, it is characterised in that when in the communication of intelligent protection terminal It is disconnected, when the distribution line where it breaks down, intelligent protection terminal automatic decision, disconnect corresponding block switch, shielding wire Road fault section.
6. the power distribution network intelligent protection system according to any one of claim 1-5, it is characterised in that when distribution line goes out Existing failure, during the switch failure of corresponding intelligent protection terminal, its higher level's intelligent protection terminal is as back-up protection.
CN201410287686.7A 2014-06-24 2014-06-24 A kind of power distribution network intelligent protection system CN104113048B (en)

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