CN107591784A - A kind of distribution statements based on collusion adaptive incomplete differential protection method of circuit - Google Patents
A kind of distribution statements based on collusion adaptive incomplete differential protection method of circuit Download PDFInfo
- Publication number
- CN107591784A CN107591784A CN201710727617.7A CN201710727617A CN107591784A CN 107591784 A CN107591784 A CN 107591784A CN 201710727617 A CN201710727617 A CN 201710727617A CN 107591784 A CN107591784 A CN 107591784A
- Authority
- CN
- China
- Prior art keywords
- main unit
- ring main
- circuit
- differential
- dtu
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
A kind of distribution statements based on collusion adaptive incomplete differential protection method of circuit.The protection domain of line related differential protection is identified according to DTU communications status：Select the corresponding magnitude of current to participate in the calculating of line differential protection, choose whether using the breaker to be tripped when not exclusively expanding Differential Protection Theory, and selecting corresponding breaker to be acted as differential protection.Basis presets principle simultaneously; select difference current definite value, the setting method of differential action time definite value; so as to realize the differential positioning entirely of the failure of whole distribution area protection system; strong guarantee is provided for fast power restoration after the quick and precisely fault location, and failure of the distributed access distribution network systems of clean energy resource.
Description
Technical field
The invention belongs to relay protection of power system and automatic field, and in particular to applied to distribution area protection system
In, one kind statements based on collusion adaptive incomplete differential protection method of circuit.
Background technology
With the continuous growth of new energy access power distribution network demand and the continuous change of urban power distribution network rack, cause looped network
The situation of even multi-ring network power supply is more and more.Under particularly more power conditions, the uncertainty of the sense of current so that traditional
Power distribution automation means can not meet the requirement of the selectivity of distribution network protection, the lance between the quick-action and selectivity of protection
Shield seems more prominent in this case.For matching problem present in troubleshooting mode in part in distribution, with barrier
Domain protection can more easily realize unified matching management, main protection is assisted with back-up protection as a protection and control system
Allotment is closed, and has very big advantage compared with master station-centralized feeder automation at real-time aspect.When solving line failure
In terms of cooperation difficulty bypasses the immediate leadership the problem of tripping between breaker, locality protection greatly improves the selectivity of protection and quick-action will
Ask.Area protection system is furnished with differential function, can identify trouble point rapidly, then after tripping higher level breaker, then tripping failure
Circuit bilateral on-load switch, then closes breaker, with fast recovery of power supply by spare power.
For Line Current Differential Protection, it is necessary to which the current information for obtaining each side of protected circuit just can guarantee that base
The application of your Hough theorem.Centralized distribution region differential protection depends on the network service of distribution network terminal (DTU), when some
The situation of communication disruption occurs for DTU, and line related differential protection can not obtain the side current information, and differential protection will have to move back
Go out operation, the safe operation to distribution line brings hidden danger.
The content of the invention
In distribution area protection system, by interconnector Differential Protection Theory between adjacent ring main unit, realize that failure is determined
Position and isolation, once some DTU failure or communication abnormality, then cause the DTU line related differential protections to exit.The present invention provides
A kind of distribution statements based on collusion adaptive incomplete differential protection method of circuit, to overcome existing distribution region wire differential protection
Deficiency.
The present invention specifically uses following technical scheme.
A kind of distribution statements based on collusion adaptive incomplete differential protection method of circuit, in power distribution network, ring main unit passes through hand in hand
Mode is connected between two transformer stations, and distribution network terminal device DTU is mounted in each ring main unit, and DTU leads in each ring main unit
Cross data communication network interactive simulation amount sampled data；The distribution statements based on collusion circuit includes the interconnection between adjacent ring main unit
Interconnector between road, and transformer station and ring main unit；Characterized in that, the guard method comprises the following steps：
(1) this side three-phase current of interconnection between local mounted DTU collection ring main unit in each ring main unit, while each DTU
The electric current of interconnection offside and adjacent interconnection offside three-phase current are obtained from data communication network；
(2) communications status of DTU in each ring main unit is judged, when DTU communications are normal in each ring main unit, into step (3), when
A certain ring main unit DTU communication disruptions then enter step (4)；
(3) each route protection unit takes this section of circuit both sides electric current to carry out differential protection calculating on distribution statements based on collusion circuit,
If differential protection acts, this circuit of tripping both sides breaker；
(4) when DTU communication disruptions in a certain ring main unit be present, the ring main unit both sides line differential protection unit across this
The ring main unit of DTU communication disruptions, adjacent lines offside electric current is selected to be inputted as the differential protection of opposite end, using not exclusively differential
Protection philosophy carries out fault location differentiation, this side of tripping switch and adjacent lines offside switch during action, by Fault Isolation scope
It is extended to adjacent lines.
The present invention further comprises following preferred scheme：
In step (4), when using difference stream definite value self-adaptive sites, difference current definite value need to escape leads to across the DTU
Believe the ring main unit circuit poor memory stream interrupted, i.e., its affiliated ring main unit both sides circuit opposite end calculates difference stream before the DTU communication disruptions
Value, the setting mode are applied to the stable situation of ring main unit load fluctuation；
When not using difference stream definite value self-adaptive sites, difference current definite value needs to escape the looped network of the DTU communication disruptions
The maximum load current of cabinet, the setting mode are applied to the larger situation of ring main unit load fluctuation.
When differential time definite value uses quick-action principle, the not exclusively differential time setting of circuit is 0s, when occur circuit or
During bus-bar fault, protection all can quick acting；When differential time definite value is using bus differential protecting actuation time principle is escaped,
The circuit not exclusively differential time can be adjusted as 0.2s, if bus-bar fault occurs, bus bar differential prptection operation excision failure, circuit is incomplete
Differential protection is failure to actuate, and second of setting mode needs to consider that 10kV protection for feed line actuation times leave differential fault location time for
Whether nargin is had.
The present invention has technique effect beneficial below：
Not exclusively expanding differential protection function can not identify in the interconnector failure occurred in area, bus-bar fault or station
Load line failure, therefore differential action time definite value adjusts applicable two kinds of principles, first, preferential quick excision and restoration principles,
3 kinds of fault types of the above, short delay quick acting are not differentiated between now；Second, expand differential protection function and come as back-up protection
The principle used, escape bus bar differential prptection operation time and charge circuit operating time of protection.
The present invention can identify DTU plant failures state and DTU communications status in distribution district system, solve because indivedual
Plant failure or communication disruption can not application circuit differential protection the problem of, carried for the safety and reliable location failure of distribution line
Perfect measure is supplied.
Brief description of the drawings
Fig. 1 is the current differential protection schematic diagram of distribution line；
Fig. 2 is the schematic flow sheet of the application distribution statements based on collusion adaptive incomplete differential protection method of circuit.
Embodiment
The present invention is described in further detail with example below in conjunction with the accompanying drawings.
The current differential protection schematic diagram for the circuit method of operation of being acted in collusion to make each other's confessions as shown in Figure 1 for 10kV distributions.The first and second two power transformations
There are multiple ring main units between standing, be respectively provided with the DTU equipment for supporting distribution regional function, the defencive function of configuration is poor including interconnection
Dynamic defencive function, bus differential protecting function, charge circuit overcurrent protection function, and adaptive not exclusively expansion differential protection
Function；DTU equipment is interconnected by private data communication network and forms " distribution area protection system ", is the system institute shown in figure
The minimum wiring scale covered.
Wherein, the interconnector between first ring main unit and second ring main unit is protected circuit, is line differential protection principle
Protection domain, i.e., " the line poor 1 " in figure；Got in touch between first ring main unit and the third ring main unit by second ring main unit, be not exclusively poor
The protection domain of dynamic protection philosophy, the i.e., " contact between interconnection L1, the ring main unit of second third between the ring main unit of line poor 2 " first and second in figure
Line L2 adjacent lines each other.
It is illustrated in figure 2 the flow signal of the distribution statements based on collusion adaptive incomplete differential protection method of circuit disclosed in the present application
Figure, the automatic not exclusively expansion line differential protection method that adapts to specifically include following steps：
By taking the first and second the third 3 ring main units as an example, second ring main unit DTU hinders generation communication disruption for some reason, with distribution locality protection system
System loses data exchange capability.
Step 1：By the DTU equipment of distribution area protection system, the magnitude of current needed for differential protection, DTU1 collection first are gathered
The circuit three-phase current of the switch of ring main unit 102, the circuit three-phase current of the switch of DTU2 collection second ring main unit 201, DTU3 collections third
The circuit three-phase current that ring main unit 301 switchs, and it is sent to private data communication network.Install L1, L2 line differential protection
DTU equipment subscribes to the magnitude of current for obtaining above collection from private data communication network；
Step 2：Communications status of the second ring main unit DTU in distribution district system is gathered, according to second ring main unit DTU in distribution
Communications status in district system, choose whether that input is adaptive and not exclusively expand differential protection function.DTU devices are normal and net
When network communication is normal, the circuit three-phase current of the switch of DTU2 collection second ring main unit 201 can be obtained, it is believed that second ring main unit communicates just
Often, otherwise it is assumed that second ring main unit communication abnormality；
Not exclusively expand the difference current definite value and difference of differential protection function according to principle self-adaptive sites set in advance
Dynamic operating time of protection.
Step 3：When second ring main unit DTU communications are normal, as shown in figure 1, when f1 failures occur, by first ring main unit 102
The differential protection action for the line current composition that line current, the second ring main unit 201 of switch switch, i.e. line in figure poor 1, are protected
Shield and isolation range are circuit L1；When f2 failures occur, acted by second ring main unit DTU bus differential protecting；As generation f3
During failure, acted by second ring main unit DTU charge circuit overcurrent protection.
Step 4：When second ring main unit DTU communication abnormalities, the DTU can not send out our station current information to Local Area Network, line
Poor 1 functional unit exits because lacking side current data.Now, input is adaptive not exclusively expands differential protection function, first
Line current that ring main unit 102 switchs, the line current of the third ring main unit 301 switch are as differential protection input current, during action
Tripping 102 switchs and 301 switches, and protection and isolation range are extended into adjacent lines L2.
For adjusting for difference current definite value, when using difference stream definite value self-adaptive sites, difference current definite value need to escape
Across the ring main unit circuit poor memory stream of the DTU communication disruptions, i.e., its affiliated ring main unit both sides circuit pair before the DTU communication disruptions
End calculates poor flow valuve, such as calculating difference flow valuve of 102 switches with 301 switches before second ring main unit DTU interruptions, the side of adjusting in Fig. 1
Formula is applied to the stable situation of ring main unit load fluctuation；When not using difference stream definite value self-adaptive sites, difference current definite value needs
The maximum load current of the ring main unit of the DTU communication disruptions is escaped, such as the maximum load current of second ring main unit in Fig. 1, this is whole
Mode is determined suitable for the larger situation of ring main unit load fluctuation.
For adjusting for differential time definite value, when differential time definite value uses quick-action principle, when circuit is not exclusively differential
Between adjust as 0s, when circuit or bus-bar fault occurs, protection all can quick acting；Bus is escaped when differential time definite value uses
During differential protection actuation time principle, the circuit not exclusively differential time can be adjusted as 0.2s, if bus-bar fault, bus differential protection occurs
Action excision failure, circuit incomplete differential protection are failure to actuate, and second of setting mode needs to consider the action of 10kV protection for feed line
Time leaves whether differential fault location time has nargin for.
Hereafter perform reclosing by region self-healing logic and turn power supply, so as to recover fault-free block supply.
Example given above is not made any formal to illustrate the present invention and its practical application to the present invention
Limitation, any one professional and technical personnel in the range of without departing from technical solution of the present invention, according to above technology and
Method makees certain modification and change when the equivalent embodiment for being considered as equivalent variations.
Claims (3)
- A kind of adaptive incomplete differential protection method of circuit 1. distribution is acted in collusion to make each other's confessions, in power distribution network, ring main unit passes through side hand in hand Formula is connected between two transformer stations, and distribution network terminal device DTU is mounted in each ring main unit, and DTU passes through in each ring main unit Data communication network interactive simulation amount sampled data；The distribution statements based on collusion circuit includes the interconnector between adjacent ring main unit, And the interconnector between transformer station and ring main unit；Characterized in that, the guard method comprises the following steps：(1) this side three-phase current of interconnection between local mounted DTU collection ring main unit in each ring main unit, while each DTU is from number The electric current of interconnection offside and adjacent interconnection offside three-phase current are obtained according to communication network；(2) communications status of DTU in each ring main unit is judged, when DTU communicates normally, into step (3), when a certain in each ring main unit Ring main unit DTU communication disruptions then enter step (4)；(3) each route protection unit takes this section of circuit both sides electric current to carry out differential protection calculating on distribution statements based on collusion circuit, if poor Dynamic protection act, this circuit of tripping both sides breaker；(4) when DTU communication disruptions in a certain ring main unit be present, the ring main unit both sides line differential protection unit is across the DTU The ring main unit of communication disruption, adjacent lines offside electric current is selected to be inputted as the differential protection of opposite end, using incomplete differential guarantor Protect principle and carry out fault location differentiation, this side of tripping switch and adjacent lines offside switch, Fault Isolation scope is expanded during action Greatly to adjacent lines.
- The adaptive incomplete differential protection method of circuit 2. distribution according to claim 1 is acted in collusion to make each other's confessions, it is characterised in that：In step (4), when using difference stream definite value self-adaptive sites, difference current definite value need to be escaped across in DTU communications Disconnected ring main unit circuit poor memory stream, i.e., its affiliated ring main unit both sides circuit opposite end calculates poor flow valuve before the DTU communication disruptions, should Setting mode is applied to the stable situation of ring main unit load fluctuation；When not using difference stream definite value self-adaptive sites, difference current definite value needs to escape the ring main unit of the DTU communication disruptions Maximum load current, the setting mode are applied to the larger situation of ring main unit load fluctuation.
- The adaptive incomplete differential protection method of circuit 3. distribution according to claim 2 is acted in collusion to make each other's confessions, it is characterised in that：When differential time definite value uses quick-action principle, the not exclusively differential time setting of circuit is 0s, when generation circuit or bus During failure, protection all can quick acting；When differential time definite value is using bus differential protecting actuation time principle is escaped, circuit The incomplete differential time can be adjusted as 0.2s, if bus-bar fault occurs, bus bar differential prptection operation excision failure, circuit is not exclusively differential Protection is failure to actuate, and second of setting mode needs to consider whether 10kV protection for feed line actuation times leave differential fault location time for There is nargin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710727617.7A CN107591784B (en) | 2017-08-23 | 2017-08-23 | A kind of distribution statements based on collusion adaptive incomplete differential protection method of route |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710727617.7A CN107591784B (en) | 2017-08-23 | 2017-08-23 | A kind of distribution statements based on collusion adaptive incomplete differential protection method of route |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107591784A true CN107591784A (en) | 2018-01-16 |
| CN107591784B CN107591784B (en) | 2019-03-26 |
Family
ID=61042501
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710727617.7A Active CN107591784B (en) | 2017-08-23 | 2017-08-23 | A kind of distribution statements based on collusion adaptive incomplete differential protection method of route |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107591784B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687415A (en) * | 2018-12-27 | 2019-04-26 | 长园深瑞继保自动化有限公司 | The fault diagnosis isolation restoration methods and system of distributed data transport unit |
| CN110854839A (en) * | 2019-10-12 | 2020-02-28 | 江苏远望仪器集团有限公司 | Power supply system for monitoring system and asymmetric load fault diagnosis method |
| CN113036727A (en) * | 2021-03-12 | 2021-06-25 | 国网江苏省电力有限公司常州供电分公司 | Distributed current differential protection system and method |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120265360A1 (en) * | 2011-04-13 | 2012-10-18 | Andre Smit | Method and system for programming and implementing automated fault isolation and restoration using sequential logic |
| CN103078303A (en) * | 2012-07-20 | 2013-05-01 | 南京南瑞继保电气有限公司 | Differential protection method capable of automatically switching protection domains |
| CN103354353A (en) * | 2013-06-24 | 2013-10-16 | 国家电网公司 | Intelligent power-distribution-network whole-line quick-reacting main protection and determination system and method |
| CN103545799A (en) * | 2013-11-01 | 2014-01-29 | 北京四方继保自动化股份有限公司 | Circuit differential protection method automatically adapting to external bridge circuit |
| US20140169157A1 (en) * | 2012-12-14 | 2014-06-19 | General Electric Company | Method and system for current differential protection |
| CN204425041U (en) * | 2014-12-15 | 2015-06-24 | 广东电网有限责任公司珠海供电局 | Distribution terminal system |
| CN104810809A (en) * | 2015-04-21 | 2015-07-29 | 国家电网公司 | Micro-grid current selective tripping protection method applicable to photovoltaic multipoint access |
| CN105048418A (en) * | 2015-07-06 | 2015-11-11 | 四川艾德瑞电气有限公司 | Digital incompletion bus differential protection method based on current state quantity |
| CN105186472A (en) * | 2015-10-14 | 2015-12-23 | 南京国电南自电网自动化有限公司 | Line longitudinal differential protection method for transformer station area information collection |
| CN106684836A (en) * | 2016-11-15 | 2017-05-17 | 南方电网科学研究院有限责任公司 | Valve bank differential protection method performing synthesis judgment based on difference stream waveforms |
| CN106711975A (en) * | 2017-03-20 | 2017-05-24 | 中国南方电网有限责任公司 | Method for positioning, isolating and quickly recovering fault on basis of distributed differential protection |
-
2017
- 2017-08-23 CN CN201710727617.7A patent/CN107591784B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120265360A1 (en) * | 2011-04-13 | 2012-10-18 | Andre Smit | Method and system for programming and implementing automated fault isolation and restoration using sequential logic |
| CN103078303A (en) * | 2012-07-20 | 2013-05-01 | 南京南瑞继保电气有限公司 | Differential protection method capable of automatically switching protection domains |
| US20140169157A1 (en) * | 2012-12-14 | 2014-06-19 | General Electric Company | Method and system for current differential protection |
| CN103354353A (en) * | 2013-06-24 | 2013-10-16 | 国家电网公司 | Intelligent power-distribution-network whole-line quick-reacting main protection and determination system and method |
| CN103545799A (en) * | 2013-11-01 | 2014-01-29 | 北京四方继保自动化股份有限公司 | Circuit differential protection method automatically adapting to external bridge circuit |
| CN204425041U (en) * | 2014-12-15 | 2015-06-24 | 广东电网有限责任公司珠海供电局 | Distribution terminal system |
| CN104810809A (en) * | 2015-04-21 | 2015-07-29 | 国家电网公司 | Micro-grid current selective tripping protection method applicable to photovoltaic multipoint access |
| CN105048418A (en) * | 2015-07-06 | 2015-11-11 | 四川艾德瑞电气有限公司 | Digital incompletion bus differential protection method based on current state quantity |
| CN105186472A (en) * | 2015-10-14 | 2015-12-23 | 南京国电南自电网自动化有限公司 | Line longitudinal differential protection method for transformer station area information collection |
| CN106684836A (en) * | 2016-11-15 | 2017-05-17 | 南方电网科学研究院有限责任公司 | Valve bank differential protection method performing synthesis judgment based on difference stream waveforms |
| CN106711975A (en) * | 2017-03-20 | 2017-05-24 | 中国南方电网有限责任公司 | Method for positioning, isolating and quickly recovering fault on basis of distributed differential protection |
Non-Patent Citations (1)
| Title |
|---|
| 李瑞生: "适用主动配电网的差动保护方案研究", 《电力系统保护与控制》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687415A (en) * | 2018-12-27 | 2019-04-26 | 长园深瑞继保自动化有限公司 | The fault diagnosis isolation restoration methods and system of distributed data transport unit |
| CN109687415B (en) * | 2018-12-27 | 2020-08-04 | 长园深瑞继保自动化有限公司 | Fault diagnosis isolation recovery method and system for distributed data transmission unit |
| CN110854839A (en) * | 2019-10-12 | 2020-02-28 | 江苏远望仪器集团有限公司 | Power supply system for monitoring system and asymmetric load fault diagnosis method |
| CN113036727A (en) * | 2021-03-12 | 2021-06-25 | 国网江苏省电力有限公司常州供电分公司 | Distributed current differential protection system and method |
| CN113036727B (en) * | 2021-03-12 | 2022-08-30 | 国网江苏省电力有限公司常州供电分公司 | Distributed current differential protection system and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107591784B (en) | 2019-03-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104518564B (en) | Backup automatic switching apparatus with area automatic switching function, and backup automatic switching method | |
| CN102270836B (en) | Wide-area over-current protection method and system for power distribution network | |
| CN107069676A (en) | Distribution network failure positions and quickly isolated recovery control method | |
| CN103022994B (en) | Method for achieving fault isolation and recovery of power distribution network with permeability distribution type power supply | |
| CN102684175B (en) | A kind of implementation method of micro-capacitance sensor protection | |
| CN103384058B (en) | Based on transformer station's integration failure protection method of territory, station protection | |
| CN101641849A (en) | Fuse saving power distribution system fault protection | |
| KR20170015913A (en) | Fault protection in converter-based dc distribution systems | |
| Coster et al. | Effect of DG on distribution grid protection | |
| CN108400576A (en) | A kind of implementation method of alternating current-direct current mixing distribution protection | |
| CN107591784B (en) | A kind of distribution statements based on collusion adaptive incomplete differential protection method of route | |
| CN102386614A (en) | Method for sharing standby protecting device by power equipment in intelligent transformer substation | |
| CN106532683A (en) | Self-healing method of 110kV transformer station hand-in-hand power supply | |
| CN106786418A (en) | A kind of relay protection scheme system for being used to get in touch between 10 kilovolts of switchyard stations | |
| CN107959286B (en) | 3/2 wiring mode-based dynamic reconstruction method for power transmission network | |
| CN100440671C (en) | Integrated protection system based on multiple traditional protection technologies | |
| CN104319743A (en) | Method and device for quick backup protection of high-voltage side of main transformer based on station region information | |
| CN110518699B (en) | Out-of-step separation control system based on wide area information | |
| CN202550668U (en) | Distributed power distribution network management terminal | |
| CN107910855A (en) | A kind of connection applied to intelligent substation cuts small power supply device and connection blanking method | |
| CN101707397A (en) | Auto-switch-on system on basis of power grid dispatching and implementation method thereof | |
| CN203481822U (en) | Closed loop power supply model of medium voltage 10 kilovolt power distribution network | |
| CN105655880B (en) | The configuration mode of 110 kilovolts of system busbar voltage load equiblibrium mass distributions of intelligent substation double bus scheme mode | |
| CN105470934A (en) | Power distribution network automatic reclosing control method suitable for distributed power source connection | |
| CN103746354B (en) | One kind is based on transformer station's overcurrent protection method for isolating power distribution network fault without constant time lag in |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |