CN103442312B - Intelligent distribution network clock synchronization system based on PTN+EPON communication system and method - Google Patents
Intelligent distribution network clock synchronization system based on PTN+EPON communication system and method Download PDFInfo
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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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
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
Abstract
The present invention relates to a kind of power distribution network clock synchronization system and method, particularly to a kind of intelligent distribution network clock synchronization system based on PTN+EPON communication system and method.Including precision clock source apparatus, the master clock port of precision clock source apparatus by IEC61588 agreement connect local side PTN device from clock port, the master clock port of local side PTN device cascades with the PTN device in multiple transformer stations successively and forms a loop configuration, the master clock port connection route device of the described PTN device in transformer station, router by switch connect OLT device from clock port, OLT device connects ONU equipment by optical fiber, and the master clock port of ONU equipment is connected with distribution terminal.GPS is only used as clock source by the present invention, application IEC61588 technology, by communication system, precise time is transmitted step by step, whole intelligent distribution network is made to realize time synchronized, time precision is better than 1 microsecond in theory, little to the dependence of GPS, it is possible to meet the intelligent distribution network requirement to time synchronized, simple in construction, practicality is high.
Description
Technical field
The present invention relates to a kind of power distribution network clock synchronization system and method, particularly to a kind of intelligence based on PTN+EPON communication system
Power distribution network clock synchronization system and method.
Background technology
Along with the fast development of intelligent distribution network, the intelligent distribution network key such as synchro measure and pilot protection based on communication network is propped up
Support technology all proposes the highest requirement to clock synchronization system, and therefore Time synchronization technique status in intelligent distribution network is also got over
Come the highest.
Existing power system simultaneous techniques is most widely used be exactly global positioning system (Global Positioning System,
GPS).The statistical error of GPS output is 1 μ s, can meet the clock synchronization requirement of Automation of Electric Systems, in transformer station certainly
Dynamicization and dispatching automation are widely used.
IEC61588 agreement full name is the precision interval clock synchronous protocol standard of network measure and control system, is called for short PTP
(Precision Time Protocol).It is accurate that IEC61588 standard predominantly meets the measurement required for measuring instrument and Industry Control
Exactness and produce, defined IEEE1588V2 in 2008, and quickly by International Electrotechnical Commission (International
Electrotechnical Commission, IEC) and national standard employing, form IEC61588-2009 and GB/T25931
-2010 standards.It is a kind of accurate clock synchronization protocol, has the net synchronization capability of submicrosecond level.
Distribution network communication system can be divided into two-layer, backbone layer and Access Layer from structure.Backbone layer realizes the communication between transformer station,
Main employing SDH/MSTP(Synchronous Digital Hierarchy/Multi-Service Transfer Platform,
SDH/multiservice transport platform) technology, group transmission network (Packet Transport Network, PTN) skill
Art etc..PTN technology with Packet Service as core, supports that multi-service provides by it, have high availability and reliability, expansible and
The characteristics such as higher security become the present stage topmost communication technology of power communication backbone network.Access Layer realizes line feed terminals
Information has passive optical network PON technology and industrial Ethernet technology etc. to the function of collecting of transformer station, major technique.Passive optical network
Ethernet passive optical network (Ethernet Passive Optical Network, EPON) in network relies on its high bandwidth, builds
If low cost, distribution flexibly, there is Supporting multi-services ability, be prone to the advantages such as extension and upgrading, become intelligent power distribution
The one preferred technique that network communication system Access Layer is built.
It is the most unfavorable for security that GPS is highly relied on by existing intelligent distribution network clock synchronization system, and intelligent distribution network
There is site many and disperse, have a very wide distribution, the feature such as circumstance complication, if installing GPS device at each distribution terminal,
There is in terms of economy and feasibility the biggest challenge.
Summary of the invention
According to above deficiency of the prior art, the problem to be solved in the present invention is: providing a kind of technology simple, operating cost is low,
Time precision is high, little to GPS dependence, it is possible to meet the intelligence based on PTN+EPON communication system of intelligent distribution network time synchronized
Can power distribution network clock synchronization system and method.
The technical solution adopted for the present invention to solve the technical problems is:
Described intelligent distribution network clock synchronization system based on PTN+EPON communication system, including precision clock source apparatus, time accurate
The master clock port of clock source apparatus by IEC61588 agreement connect local side PTN device from clock port, during local side PTN device main
Clock port cascades with the PTN device in multiple transformer stations successively and forms a loop configuration, the master of the described PTN device in transformer station
Clock port connection route device, router by switch connect OLT device from clock port, OLT device connects ONU by optical fiber
Equipment, the master clock port of ONU equipment is connected with distribution terminal.
Described intelligent distribution network clock synchronization system based on PTN+EPON communication system is characterised by that whole power distribution network is by logical
Precise time is transmitted by communication system step by step, makes whole intelligent distribution network realize time synchronized.Distribution network communication system is divided into from structure
Backbone layer and Access Layer, when IEC61588 technology has been incorporated into distribution network automated pair by the present invention in system, at backbone layer multiplexing PTN
Network, at Access Layer multiplexing EPON network, IEC61588 technology ensure that network time synchronization precision, and lowers distribution network to GPS
The dependence of system, improves safety and reliability.In backbone layer and the junction of Access Layer, will report by switch and router
Literary composition passes to the EPON equipment of Access Layer, switch and router device and only serves the effect converged and route, during in order to reduce border
The accumulated error that clock progression too much produces, is all configured to transparent clock by the two equipment, it is achieved the transparent transmission of clock message.Backbone layer
Upper main website local side PTN device and transformer station are respectively configured PTN device to constitute ring network, and key looped network uses linear 1+1 redundancy protecting,
Employing dual transmitting and receiving mechanism, information source sends business information to master channel and alternate channel simultaneously, when network is normal, receiving terminal PTN
Equipment receives the information on service aisle, and when network failure, receiving device receives the information on protection passage.
Wherein preferred version is:
Described precision clock source apparatus is GPS device or Big Dipper device or GPS/ Big Dipper device, and precision clock source apparatus is arranged
High-stability constant-temperature crystal oscillator and GPS and Big Dipper reception antenna.Using the most standby clock source as system of GPS/ dipper system,
Use high-stability constant-temperature crystal oscillator (OCXO) as local clock, use GPS and dipper system that high stability crystal oscillator is carried out calibrating frequency
Realize synchronizing.If GPS and dipper system is the most disturbed can not normally use, high stability crystal oscillator, automatically into hold mode, continues
There is provided high accuracy frequency and time signal output, to maintain the normal work of system.
Described OLT device connects multiple ONU equipment by optical splitter.Multiple joining can be accessed as desired by ONU equipment
Electric terminals.
The interface of described distribution terminal uses single network interface or double network interface.Distribution terminal joins (Feeder Terminal Unit, FTU)
Having two network interfaces of standby usage, time properly functioning, FTU accepts the synchronizing information from primary network interface, when primary network interface breaks down not
When can receive synchronizing information, FTU automatically switches to standby network interface, continues to the synchronizing information from ONU.
Described ONU equipment arranges primary and backup two PON interfaces.Two PON interfaces of standby usage are had on each ONU,
Receiving respectively and come from the sync message on two optical cables, the synchronization that when system is properly functioning, ONU receives from primary PON mouth is believed
Breath, when there is the faults such as optical cable broken string, primary PON mouth does not receives the information coming from OLT, then switch in 50ms
Standby PON mouth, receives the synchronizing information from spare OLT.So, IEC61588 can just be completed at Access Layer communication port
Switching, it is ensured that pair time system reliability.
The EPON system topological structure that described OLT device connection ONU equipment is formed uses bus-type or pulls hand-type or OLT
Double-PON port type.Standby usage OLT pulling hand-type redundancy group net is arranged respectively in Liang Ge transformer station, and this mode is applicable to ground
Reason position power distribution equipment between Liang Ge transformer station；Standby usage OLT of OLT double-PON port type redundancy networking is arranged in same
In transformer station, can be two PTN device, it is also possible to be two PON interfaces of an equipment, this mode can be by 2
Core fibre realizes, and is generally applicable on the Distributing Terminal Assembly of various position.
Described PTN device uses boundary clock, router and switch to use transparent clock, and OLT device and ONU equipment are common
It is configured to boundary clock.PTN device uses boundary clock model, and temporal information can be transmitted, play separation by boundary clock step by step
The effect of PTP subdomain.Backbone layer and the router of Access Layer junction and switch use transparent clock model, and transparent clock is permissible
Reduce the clock node accumulated error to PTP message, improve timing tracking accuracy.EPON equipment uses OLT(optical line
Terminal, optical line terminal) and ONU(Optical Network Unit, optical network unit) jointly it is configured to boundary clock
Model, principal and subordinate's timing tracking accuracy can reach 100ns, meets the intelligent distribution network requirement to synchronization accuracy.
PTN device in described transformer station connects GPS/ Big Dipper precision clock source apparatus.Arrange standby at transformer station with good conditionsi
With clock source, each clock node by the best master clock algorithm in each self-operating IEC61588 realize clock source automatic
Select.
Described intelligent distribution network method for synchronizing time based on PTN+EPON communication system, its step includes:
1) using GPS/ Big Dipper device as precision clock source apparatus, high-stability constant-temperature crystal oscillator, as local clock, passes through GPS
With dipper system, high-stability constant-temperature crystal oscillator is carried out calibrating frequency to realize synchronizing；
2) the precision clock message with temporal information that precision clock source apparatus generates, passes to office by IEC61588 port
End PTN device, local side PTN device is by receiving precision clock message from clock port, and extracts the temporal information in message
Updating local clock, terminate this message simultaneously, and local side PTN device is set to boundary clock model；
3) the precision clock message of the temporal information with local clock generated is passed in transformer station by local side PTN device
PTN device, the PTN device in transformer station is by receiving precision clock message from clock port, and extracts the time letter in message
Breath updates local clock, and terminate this message simultaneously, and the PTN device in transformer station is set to boundary clock model；
4) the precision clock message of the temporal information with local clock that the PTN device in transformer station generates, on the one hand reports this
Literary composition passes to the PTN device in next transformer station by second line of a couplet network interface as master clock information, until the detection of local side PTN device
End after the message information that last transformer station transmits, and abandon this message information, re-form new precision clock source
Continue to transmit successively；On the other hand this message is passed to by the router of backbone layer and switch the EPON equipment of Access Layer
OLT device, router and switch configuration are transparent clock model；
5), when precision clock message is delivered to Access Layer EPON equipment, the distance measurement function within EPON system is first passed through by OLT
Equipment realizes Tong Bu with the ONU equipment connected, and OLT device is set to boundary clock pattern jointly with the ONU equipment being connected；
6), after realizing OLT device and ONU equipment synchronization, OLT device is by receiving to come from switch transparent transmission from clock interface
Precision clock message, update OLT device temporal information, then by the distance measurement function of EPON system, update ONU simultaneously
The local clock of equipment；
7) ONU equipment is now as master clock, and ONU equipment generates new PTP message according to local clock, will report by second line of a couplet network interface
Distribution terminal equipment issued in literary composition.
The present invention is had the beneficial effect that
Described intelligent distribution network clock synchronization system based on PTN+EPON communication system and method solve existing intelligent distribution network
Pair time system to problems such as the height dependences of GPS.Only GPS is used as clock source, applies IEC61588 technology, multiple at backbone layer
Use PTN technology, Access Layer multiplexing EPON technology, by communication system, precise time is transmitted step by step, so that whole intelligence is joined
Electrical network realizes time synchronized, improves network time synchronization precision, reduces the power distribution network dependence to GPS system, improves peace
Full property and reliability.System master clock source is arranged at power distribution automation main website, additionally arranges standby at transformer station with good conditionsi
With clock source, by each timing node automatically select its in order to the clock source synchronized.For backbone layer application PTN technology and access
The intelligent power distribution network communication system of layer application EPON technology, is set to boundary clock pattern by backbone layer PTN device, by Access Layer
OLT and ONU of EPON system is configured to boundary clock pattern jointly, by router and the exchange of backbone layer and Access Layer junction
Machine is set to transparent clock pattern, it is achieved the classifying rationally in PTP territory.The invention provides a kind of time precision and be better than 1 in theory
Microsecond is little to the dependence of GPS, it is possible to meeting the intelligent distribution network requirement to time synchronized, simple in construction, practicality is high
Intelligent distribution network clock synchronization system.
Accompanying drawing explanation
Fig. 1 is that the precision clock of the present invention transmits schematic diagram step by step；
Fig. 2 is the system architecture topological diagram of the present invention；
Detailed description of the invention
Below in conjunction with the accompanying drawings embodiments of the invention are described further:
As shown in Figure 1 and Figure 2, intelligent distribution network clock synchronization system based on PTN+EPON communication system of the present invention, including
Precision clock source apparatus, precision clock source apparatus is GPS device or Big Dipper device or GPS/ Big Dipper device, on precision clock source apparatus
Arranging high-stability constant-temperature crystal oscillator and GPS and Big Dipper reception antenna, the master clock port of precision clock source apparatus passes through IEC61588
Agreement connect local side PTN device from clock port, the master clock port of local side PTN device sets with the PTN in multiple transformer stations successively
Standby cascade forms a loop configuration, and the master clock port connection route device of the described PTN device in transformer station, router passes through
Switch connect OLT device from clock port, OLT device connects ONU equipment by optical fiber, the master clock port of ONU equipment with join
Electric terminals is connected.
Wherein, as in figure 2 it is shown, OLT device by optical splitter POS connect multiple ONU equipment, ONU equipment arrange primary and
Standby two PON interfaces, the EPON system topological structure that OLT device connection ONU equipment is formed uses bus-type or hands in hand
Type or OLT double-PON port type.The interface of distribution terminal uses single network interface or double network interface, and PTN device uses boundary clock, router
Using transparent clock with switch, OLT device and ONU equipment are configured to boundary clock jointly.PTN device in transformer station connects
GPS/ Big Dipper precision clock source apparatus.
Intelligent distribution network method for synchronizing time based on PTN+EPON communication system, it mainly comprises the following steps:
1) using GPS/ Big Dipper device as precision clock source apparatus, high-stability constant-temperature crystal oscillator, as local clock, passes through GPS
With dipper system, high-stability constant-temperature crystal oscillator is carried out calibrating frequency to realize synchronizing；
2) the precision clock message with temporal information that precision clock source apparatus generates, passes to office by IEC61588 port
End PTN device, local side PTN device is by receiving precision clock message from clock port, and extracts the temporal information in message
Updating local clock, terminate this message simultaneously, and local side PTN device is set to boundary clock model；
3) the precision clock message of the temporal information with local clock generated is passed in transformer station by local side PTN device
PTN device, the PTN device in transformer station is by receiving precision clock message from clock port, and extracts the time letter in message
Breath updates local clock, and terminate this message simultaneously, and the PTN device in transformer station is set to boundary clock model；
4) the precision clock message of the temporal information with local clock that the PTN device in transformer station generates, on the one hand reports this
Literary composition passes to the PTN device in next transformer station by second line of a couplet network interface as master clock information, until the detection of local side PTN device
End after the message information that last transformer station transmits, and abandon this message information, re-form new precision clock source
Continue to transmit successively；On the other hand this message is passed to by the router of backbone layer and switch the EPON equipment of Access Layer
OLT device, router and switch configuration are transparent clock model；
5), when precision clock message is delivered to Access Layer EPON equipment, the distance measurement function within EPON system is first passed through by OLT
Equipment realizes Tong Bu with the ONU equipment connected, and OLT device is set to boundary clock pattern jointly with the ONU equipment being connected；
6), after realizing OLT device and ONU equipment synchronization, OLT device is by receiving to come from switch transparent transmission from clock interface
Precision clock message, update OLT device temporal information, then by the distance measurement function of EPON system, update ONU simultaneously
The local clock of equipment；
7) ONU equipment is now as master clock, and ONU equipment generates new PTP message according to local clock, will report by second line of a couplet network interface
Distribution terminal equipment issued in literary composition.
GPS is used as clock source by the present invention, applies IEC61588 technology, at backbone layer multiplexing PTN technology, Access Layer multiplexing EPON
Technology, is transmitted precise time step by step by communication system, makes whole intelligent distribution network realize time synchronized, when improve network
Between synchronization accuracy, reduce the power distribution network dependence to GPS system, improve safety and reliability.
Claims (8)
1. an intelligent distribution network clock synchronization system based on PTN+EPON communication system, it is characterised in that: include precision clock
Source apparatus, the master clock port of precision clock source apparatus by IEC61588 agreement connect local side PTN device from clock port, office
The master clock port of end PTN device cascades with the PTN device in multiple transformer stations successively and forms a loop configuration, described power transformation
The master clock port connection route device of the PTN device in standing, router by switch connect OLT device from clock port, OLT
Equipment connects ONU equipment by optical fiber, and the master clock port of ONU equipment is connected with distribution terminal；
Described intelligent distribution network clock synchronization system based on PTN+EPON communication system performs following methods, and its step includes:
1) using GPS/ Big Dipper device as precision clock source apparatus, high-stability constant-temperature crystal oscillator, as local clock, passes through
GPS and dipper system carry out calibrating frequency and realize synchronizing high-stability constant-temperature crystal oscillator；
2) the precision clock message with temporal information that precision clock source apparatus generates, is passed to by IEC61588 port
Local side PTN device, local side PTN device is by receiving precision clock message from clock port, and extracts the time in message
Information updating local clock, terminate this message simultaneously, and local side PTN device is set to boundary clock model；
3) the precision clock message of the temporal information with local clock generated is passed in transformer station by local side PTN device
PTN device, the PTN device in transformer station is by receiving precision clock message from clock port, and extracts the time in message
Information updating local clock, terminate this message simultaneously, and the PTN device in transformer station is set to boundary clock model；
4) the precision clock message of the temporal information with local clock that the PTN device in transformer station generates, on the one hand by this
Message passes to the PTN device in next transformer station by second line of a couplet network interface as master clock information, until local side PTN device
Detect and end after the message information that last transformer station transmits, and abandon this message information, re-form new accurate
Clock source continues to transmit successively；On the other hand this message is passed to Access Layer by router and the switch of backbone layer
The OLT device of EPON equipment, router and switch configuration are transparent clock model；
5), when precision clock message is delivered to Access Layer EPON equipment, the distance measurement function within EPON system is first passed through by OLT
Equipment realizes Tong Bu with the ONU equipment connected, and OLT device is set to boundary clock pattern jointly with the ONU equipment being connected；
6), after realizing OLT device and ONU equipment synchronization, OLT device is by receiving from switch transparent transmission mistake from clock interface
The precision clock message come, updates the temporal information of OLT device, then by the distance measurement function of EPON system, updates simultaneously
The local clock of ONU equipment；
7) ONU equipment is now as master clock, and ONU equipment generates new PTP message according to local clock, will by second line of a couplet network interface
Message issues distribution terminal equipment.
Intelligent distribution network clock synchronization system based on PTN+EPON communication system the most according to claim 1, it is special
Levy and be: described precision clock source apparatus is GPS device or Big Dipper device or GPS/ Big Dipper device, precision clock source apparatus
On high-stability constant-temperature crystal oscillator and GPS and Big Dipper reception antenna are set.
Intelligent distribution network clock synchronization system based on PTN+EPON communication system the most according to claim 1, it is special
Levy and be: described OLT device connects multiple ONU equipment by optical splitter.
Intelligent distribution network clock synchronization system based on PTN+EPON communication system the most according to claim 1, it is special
Levy and be: the interface of described distribution terminal uses single network interface or double network interface.
Intelligent distribution network clock synchronization system based on PTN+EPON communication system the most according to claim 1, it is special
Levy and be: described ONU equipment arranges primary and backup two PON interfaces.
Intelligent distribution network clock synchronization system based on PTN+EPON communication system the most according to claim 1, it is special
Levy and be: the EPON system topological structure that described OLT device connection ONU equipment is formed uses bus-type or pulls hand-type
Or OLT double-PON port type.
Intelligent distribution network clock synchronization system based on PTN+EPON communication system the most according to claim 1, it is special
Levy and be: the PTN device in described local side PTN device and transformer station uses boundary clock, router and switch to use
Transparent clock, OLT device and ONU equipment are configured to boundary clock jointly.
Intelligent distribution network clock synchronization system based on PTN+EPON communication system the most according to claim 1, it is special
Levy and be: the PTN device in described transformer station connects GPS/ Big Dipper precision clock source apparatus.
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