CN106712297A - Data communication system and method for intelligent power distribution terminals - Google Patents
Data communication system and method for intelligent power distribution terminals Download PDFInfo
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- CN106712297A CN106712297A CN201710053108.0A CN201710053108A CN106712297A CN 106712297 A CN106712297 A CN 106712297A CN 201710053108 A CN201710053108 A CN 201710053108A CN 106712297 A CN106712297 A CN 106712297A
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- power distribution
- distribution terminal
- vlan
- communication system
- data communication
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- 238000004891 communication Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000003993 interaction Effects 0.000 claims abstract description 3
- 238000012790 confirmation Methods 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 230000003862 health status Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000013499 data model Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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- H02J13/0062—
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/46—Interconnection of networks
- H04L12/4641—Virtual LANs, VLANs, e.g. virtual private networks [VPN]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
Abstract
The present invention relates to a data communication system and a method for intelligent power distribution terminals, wherein the system and the method are applied to a power distribution network. The data communication system includes at least one switch having the VLAN function and a plurality of power distribution terminals connected with the switch. The power distribution terminals are divided in multiple VLAN packets according to the protection association. The power distribution terminals in each VLAN packet communicate with one another. The packet number of the multiple VLAN packets is equal to the number of protection sections in the power distribution network. During the normal operation, the multicast of a heartbeat command is conducted from each power distribution terminal to all the other power distribution terminals in the same VLAN packet. During the occurrence of a fault, the multicast of the fault information is conducted from a power distribution terminal associated with the fault section to all the other power distribution terminals in the same VLAN packet. All the other power distribution terminals in the same VLAN packet receive the fault information and then calculate the fault section. In this way, the fault section is separated from all the other non-fault sections, and then the power supply is recovered. After that, the interaction of operating results of the power distribution terminals is realized by adopting acknowledgment messages. Compared with the prior art, the system and the method have the advantages of less network traffic, rapid response, and the like.
Description
Technical field
The present invention relates to intelligent distribution network communication technical field, more particularly, to a kind of Intelligent power distribution terminal data communication system
System and method.
Background technology
With the access of the novel electric power related facility such as distributed energy, controllable burden, the structure of power system there occurs
Great change, requirement higher is it is also proposed for distribution feeder automation system.Except traditional distant place number can be realized
According to collection and control (SCADA), feed line automatization system (FA) will can also realize protection, the voltage power control of active distribution network
The problems such as system, power quality analysis and islet operation.
Implementation according to FA is different, and communication gradation can be divided into main website level communication (concentrated FA) and field apparatus level
Communicate (type FA, communicates between terminal on the spot), and the communication frequency that wherein field apparatus level communicates is low, data volume is small, real-time will
Ask high.The communication standard that traditional FA is used is mainly IEC60870-5 series stipulations, because its interoperability is poor, using towards
The data description method of point, and it uses the communication pattern of client/server so that every time communication be limited in it is one-to-one it
Between, it is impossible to meet requirements of the type FA for communication system real-time on the spot.Therefore data communication system and the side of current power distribution network
Method is not particularly suited for type FA on the spot.
The content of the invention
The purpose of the present invention is exactly to provide that a kind of network traffics are few for the defect for overcoming above-mentioned prior art to exist, ring
Answer rapid Intelligent power distribution terminal data communication system and method.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of Intelligent power distribution terminal data communication system, for distribution network, including at least one possesses functionality of vlan
Interchanger and multiple distribution terminals being connected with the interchanger, the distribution terminal are divided into multiple VLAN by protection relevance
Packet, the distribution terminal in each described VLAN packet is in communication with each other by UDP modes, the number of packet of the VLAN packets with
Protection zone segment number in distribution network is equal.
When dividing the VLAN packets, it is considered to which the protection domain of each distribution terminal protection, the protection domain includes described matching somebody with somebody
Electric terminals be joined directly together section and adjacent distribution terminal be joined directly together section.
The infomational message form that each distribution terminal is in communication with each other is with the I information formats of IEC104 agreements as base
Plinth, control domain are as VLAN packet numbers, public address CASDU as protocol massages Function Identification code.
The message Function Identification code includes that heartbeat message code, fault message exchange message code and confirmation message code.
A kind of data communications method realized using described Intelligent power distribution terminal data communication system, including：
When the data communication system is normally run, each distribution terminal timing is to other the distribution ends in same packet
End multicast heartbeat commands；
When the data communication system breaks down, the distribution terminal being associated with fault section is in same packet
Other distribution terminal multicast fault messages, each distribution terminal calculates fault section according to the fault message for receiving, and completes
Fault Isolation and non-faulting region restore electricity operation, and realize operating result interaction using confirmation message.
The heartbeat commands include own health status and the node location in affiliated protection section.
The node location refers to be divided by the relative function of being determined by protection section position of terminal.
The fault message includes local stream information, information of voltage and the on off state excessively during failure.
The data structuring model of the fault message include IEC61850-80-1 specifications in WYE models, DEL models or
CMV models.
Compared with prior art, the present invention has advantages below：
1st, present invention employs vlan technology, the information that will be transmitted on distribution network is limited in and information-related distribution end
Between end, it is to avoid the transmission of invalid packet.Meanwhile, multiple correlations can be once sent the data to by the way of multicast
Terminal object, reduces network traffics.
2nd, according to VLAN packet modes based on protecting section, specify that each packet terminal number and each
Packet situation where terminal, and role and information configuration scope that terminal is served as in different grouping are included in messages
Deng the failures for being easy to the suitable fault location algorithm reply of terminal selection different.
3rd, the data between distribution terminal are communicated using IEC60870-5-104 over UDP modes, both be make use of
Data are succinct in itself for IEC60870-5-104 agreements, the characteristics of good reliability, synchronously avoid its customer end/server mode band
The connection setup time come is long, One-to-one communication inefficiency problem.
4th, expanded definition heartbeat commands and fault message exchange command two kinds of I format information.Heartbeat commands ensure that group
Interior communication connection it is effective controllable, and contribute to associated terminal upgrade in time where packet topological structure and each node health
State.Fault message exchange command helps terminal to collect the data of each associated terminal during failure in time, makes corresponding rapidly
Treatment.The failure message information object model that the IEC61850-80-1 files worked out with reference to IEC are given, increased agreement
Self descriptiveness, be easy to distribution terminal expanded application IEC61850 specifications.
Brief description of the drawings
Fig. 1 is certain region distribution terminal in-situ protection scope and packet mode schematic diagram；
Fig. 2 is information transmission process schematic diagram between distribution terminal.
Specific embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.The present embodiment is with technical solution of the present invention
Premised on implemented, give detailed implementation method and specific operating process, but protection scope of the present invention is not limited to
Following embodiments.
The present embodiment provides a kind of Intelligent power distribution terminal data communication system, for distribution network, including at least one tool
The interchanger and multiple distribution terminals being connected with the interchanger of standby functionality of vlan, the distribution terminal is by protection relevance
It is divided into multiple VLAN packets, the distribution terminal in each described VLAN packet is in communication with each other by UDP modes, the VLAN packets
Number of packet it is equal with the protection zone segment number in distribution network.The VLAN is divided using the functionality of vlan of interchanger to be grouped
When, it is considered to the protection domain of each distribution terminal protection, the protection domain is joined directly together section and phase including the distribution terminal
Adjacent distribution terminal is joined directly together section, and each described distribution terminal at least belongs to a VLAN packet.Each packet correspondence one
Bar can respectively constitute the section in one packet by protection section comprising multiple distribution terminals, each distribution terminal in group
Main protection terminal or back-up protection terminal, a distribution terminal may belong to multiple packets.It is that can determine that often according to division result
Packet number and the corresponding terminal number of each section belonging to individual terminal.
Terminal is to be marked using 8 16 system numbers with by the relative position labeling method of protection section, and first four is relative
Position, four is protection direction afterwards.Protection level, as basis is calculated, works as end with by the linking relationship between protection section and terminal
With when being joined directly together by protection section, it is 1 to be worth at end, and during 1 section in interval, it is 2 to be worth, the like.When the electric current by terminal
When flow direction is by protection section, direction value is 0, is otherwise 1.
By taking Fig. 1 as an example, in the example network, section in solid box is the protection section of terminal S4, including L1, L2,
L4, L5, L6 etc. 5, that is to say, that the affiliated packet number of bright S4 is 5, wherein L4 directly protects section for positive, relatively
Position is 10；Reversely directly to protect section, relative position is 11 to L2；L5, L6 are positive stand-by protection section, and relative position is
20；L1 is reverse stand-by protection section, and relative position is 21.What the terminal in dotted line frame was included in being then grouped belonging to L4 sections
Whole terminals, i.e. S2, S4, S5, S6, S7 belong to the L4 section groups of VLAN, and wherein S4 is the main protection terminal of L4, and S2 is positive standby
With protection terminal, S5, S6 are reverse main protection terminal, and S7 is reverse stand-by protection terminal.
So that distribution network increases L3 transmission of electricity sections as an example, when illustrating that network structure changes, the configuration that mutually each associated terminal is needed
Situation of change.The group forming criterion of packet count is equal to according to aforementioned zones segment number, system will increase L3 section groups, and be included in the packet
Line feed terminals be S1 and S3, wherein S3 be main protection terminal, S1 be back-up protection terminal.Additionally, S3 also constitutes section L1
Reverse main protection terminal.Therefore terminal S1 corresponding ports will increase the VLAN components of a L3 and match somebody with somebody, and S3 is assigned into L1 and L3
The two VLAN groups.
Communicated using multicast mode between each distribution terminal, traffic model uses Publish-subscribe pattern, communication
Agreement is using the IEC60870-5-104 agreements after improving, and the message structure of transmission is as shown in table 1.Each distribution terminal is carried out
The infomational message form being in communication with each other is using based on the I information formats of IEC104 agreements, control domain is used as VLAN packet numbers, public
Address CASDU includes that heartbeat message, fault message exchange report as protocol massages Function Identification code, the message Function Identification code
Text and confirmation message etc..Information object address IOA in message structure as data model mark, object data content conduct
The data entity of the model.
Table 1
| Start character |
| APDU length |
| Packet number |
| Type identification TI |
| Varistructure determiner |
| Transmission reason CAU |
| Public address CASDU |
| Information object address IOA1 |
| …… |
| Information object address IOA2 |
| …… |
Distribution terminal communication protocol uses improved IEC60870-5-104 agreements in group, has abandoned and be based in former agreement
The mode of TCP, but use connectionless UDP patterns to transmit.The protocol contents of extension mainly have heartbeat message and fault data
Two kinds of exchange information.
As shown in Fig. 2 the data communications method realized using above-mentioned Intelligent power distribution terminal data communication system, including：
When the data communication system is normally run, each distribution terminal timing is to other the distribution ends in same packet
End multicast heartbeat commands, the heartbeat commands include own health status and the node location in affiliated protection section, the heart
There are 2 IOA in hop-information message, own health status and network location information are represented respectively；
When breaking down, the distribution terminal being associated with fault section is to other the distribution terminal groups in same packet
Fault message is broadcast, local during including failure crosses stream information, information of voltage and on off state etc., each distribution terminal is according to receiving
Fault message calculate fault section, complete Fault Isolation and non-faulting region and restore electricity operation, and use confirmation message
Realize that operating result is interacted.
The data structuring model of the fault message with reference to the WYE models in IEC61850-80-1 specifications, DEL models or
CMV models etc..
Provide system normal course of operation by taking S4 as an example below and when L4 sections break down, the transmission of information on network
Situation.
After system electrification, S4 starts timing, and to 5 packets (L1, L2, L4, L5, L6) at place, multicast heartbeat is believed respectively
Breath, multicast order is according to positive main protection section, astern reverse main protection section, standby protection section, reverse back-up protection area
The order of section is carried out.At the same time, the S4 heartbeat messages that other each terminals are sent in a packet also by receiving, and with inside
The network model information being pre-configured with is compared, and then control main website will be given in anomaly when occurring abnormal.Wherein S4 to
The heartbeat message of main protection section L4 packets is with reference to as shown in table 2.
Table 2
During system jam, the faults itself information that distribution terminal will be collected is assembled into the guarantor of fault message form
Temperature, then to multicast faults itself information in packet, while receiving the fault message of other each terminals in associated group.Failure message
Form is similar to heartbeat message form, essentially consists in the difference of information object.IEC61850 agreements, letter are supported for the ease of extension
Breath Format Object is using the information model defined in IEC61850-80-1, the model such as including WYE, DEL, CMV.With three-phase system
In as a example by each relatively current measurement value model WYE, the message format of information object part is as shown in table 3.
Table 3
Preferred embodiment of the invention described in detail above.It should be appreciated that one of ordinary skill in the art without
Need creative work just can make many modifications and variations with design of the invention.Therefore, all technologies in the art
Personnel are available by logical analysis, reasoning, or a limited experiment on the basis of existing technology under this invention's idea
Technical scheme, all should be in the protection domain being defined in the patent claims.
Claims (5)
1. a kind of Intelligent power distribution terminal data communication system, for distribution network, it is characterised in that possess including at least one
The interchanger of functionality of vlan and multiple distribution terminals being connected with the interchanger, the distribution terminal is by protection relevance point
For multiple VLAN are grouped, the distribution terminal in each described VLAN packet is in communication with each other by UDP modes, the VLAN packets
Number of packet is equal with the protection zone segment number in distribution network.
2. Intelligent power distribution terminal data communication system according to claim 1, it is characterised in that divide the VLAN packets
When, it is considered to the protection domain of each distribution terminal protection, the protection domain is joined directly together section and phase including the distribution terminal
Adjacent distribution terminal is joined directly together section.
3. Intelligent power distribution terminal data communication system according to claim 1, it is characterised in that each distribution terminal enters
Based on the I information formats of IEC104 agreements, wherein control domain is grouped the infomational message form that row is in communication with each other as VLAN
Number, public address CASDU as protocol massages Function Identification code.
4. the data communications method that a kind of utilization Intelligent power distribution terminal data communication system as claimed in claim 1 is realized, its
It is characterised by, including：
When the data communication system is normally run, each distribution terminal timing is to other the distribution terminal groups in same packet
Broadcast heartbeat commands；
When the data communication system breaks down, the distribution terminal being associated with fault section is to its in same packet
Its distribution terminal multicast fault message, each distribution terminal calculates fault section according to the fault message for receiving, and completes failure
Isolation restores electricity operation with non-faulting region, and realizes operating result interaction using confirmation message.
5. data communications method according to claim 4, it is characterised in that the heartbeat commands include terminal in affiliated guarantor
Node location in shield section.
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| CN201710053108.0A CN106712297A (en) | 2017-01-22 | 2017-01-22 | Data communication system and method for intelligent power distribution terminals |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233344A (en) * | 2018-01-29 | 2018-06-29 | 合肥工业大学 | Power distribution network WAMS communications protections and feeder automation method based on multicast |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102546637A (en) * | 2012-01-12 | 2012-07-04 | 航天科工深圳（集团）有限公司 | Communication terminal and method thereof for realizing communication protocol |
| CN103326465A (en) * | 2013-05-17 | 2013-09-25 | 国家电网公司 | Power distribution network terminal access method based on IEC61850 standard |
| EP2988183A1 (en) * | 2014-08-14 | 2016-02-24 | Siemens Aktiengesellschaft | Remote control assembly, system and method for observing and/or controlling a plant |
| CN105515199A (en) * | 2016-01-13 | 2016-04-20 | 山东大学 | Distributed fault detection method for intelligent power distribution network |
| CN106253250A (en) * | 2016-08-23 | 2016-12-21 | 江苏方天电力技术有限公司 | A kind of distributed rapid protection system of intelligent distribution network and guard method |
-
2017
- 2017-01-22 CN CN201710053108.0A patent/CN106712297A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102546637A (en) * | 2012-01-12 | 2012-07-04 | 航天科工深圳（集团）有限公司 | Communication terminal and method thereof for realizing communication protocol |
| CN103326465A (en) * | 2013-05-17 | 2013-09-25 | 国家电网公司 | Power distribution network terminal access method based on IEC61850 standard |
| EP2988183A1 (en) * | 2014-08-14 | 2016-02-24 | Siemens Aktiengesellschaft | Remote control assembly, system and method for observing and/or controlling a plant |
| CN105515199A (en) * | 2016-01-13 | 2016-04-20 | 山东大学 | Distributed fault detection method for intelligent power distribution network |
| CN106253250A (en) * | 2016-08-23 | 2016-12-21 | 江苏方天电力技术有限公司 | A kind of distributed rapid protection system of intelligent distribution network and guard method |
Non-Patent Citations (1)
| Title |
|---|
| 丛伟等: "智能配电终端及其标准化建模", 《电力系统自动化》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108233344A (en) * | 2018-01-29 | 2018-06-29 | 合肥工业大学 | Power distribution network WAMS communications protections and feeder automation method based on multicast |
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