CN103442312A - Intelligent power distribution network time synchronization system and method based on PTN+EPON communication system - Google Patents
Intelligent power distribution network time synchronization system and method based on PTN+EPON communication system Download PDFInfo
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- 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
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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
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Abstract
The invention relates to a power distribution network time synchronization system and method, and particularly relates to an intelligent power distribution network time synchronization system and method based on a PTN+EPON communication system. The intelligent power distribution network time synchronization system comprises an accurate clock source device. A primary clock port of the accurate clock source device is connected with a secondary clock port of a local end PTN device via an IEC61588 protocol. The primary clock port of the local end PTN device is cascaded with PTN devices in multiple transformer stations so that an annular structure is formed. The primary clock port of each PTN device in each transformer station is connected with a router which is connected with the secondary clock port of an OLT device via a switch. The OLT device is connected with an ONU device via an optical fiber. The primary clock port of the ONU device is connected with a power distribution terminal. According to the intelligent power distribution network time synchronization system, only a GPS is used as a clock source. An IEC61588 technology is applied, accurate time is transmitted step by step via a communication system so that time synchronization of the whole intelligent power distribution network is realized. Time accuracy is superior to 1 microsecond theoretically so that dependency on the GPS is low, and a requirement of the intelligent power distribution network towards time synchronization can be met. Therefore, the intelligent power distribution network time synchronization system is simple in structure and high in practicality.
Description
Technical field
The present invention relates to a kind of power distribution network clock synchronization system and method, particularly a kind of intelligent distribution network clock synchronization system and method based on the PTN+EPON communication system.
Background technology
Fast development along with intelligent distribution network; synchro measure and the intelligent distribution network critical support technology such as pilot protection based on communication network have all proposed very high requirement to clock synchronization system, so the status of Time synchronization technique in intelligent distribution network is also more and more higher.
Existing electric power system simultaneous techniques is most widely used is exactly global positioning system (Global Positioning System, GPS).The statistical error of GPS output is 1 μ s, can meet the clock synchronous requirement of Automation of Electric Systems, in the automation of transformation substations and dispatching automation, is widely used.
The precision interval clock synchronous protocol standard that IEC61588 agreement full name is network measure and control system, be called for short PTP (Precision Time Protocol).The IEC61588 standard is mainly and meets measuring instrument and the needed accuracy of measurement of Industry Control and produce, formed IEEE1588V2 in 2008, and very soon by (the International Electrotechnical Commission of International Electrotechnical Commission, IEC) and national standard adopt, form IEC61588-2009 and GB/T25931-2010 standard.It is a kind of accurate clock synchronization protocol, the net synchronization capability with submicrosecond level.
Distribution network communication system can be divided into two-layer structure, backbone layer and Access Layer.Backbone layer is realized the communication between transformer station, the main SDH/MSTP(Synchronous Digital Hierarchy/Multi-Service Transfer Platform that adopts, SDH (Synchronous Digital Hierarchy)/multiservice transport platform) technology, group transmission network (Packet Transport Network, PTN) technology etc.The PTN technology relies on it to take Packet Service as core, supports that multi-service provides, and high availability and reliability is arranged, can expand and the higher characteristics such as fail safe become the topmost communication technology of present stage power communication backbone network.Access Layer is realized the collect function of line feed terminals information to transformer station, and major technique has passive optical network PON technology and Industrial Ethernet technology etc.Ethernet passive optical network in EPON (Ethernet Passive Optical Network, EPON) rely on its high bandwidth, construction cost is low, distributions is flexible, have the Supporting multi-services ability, be easy to expand and the advantages such as upgrading, has now become the one preferred technique of intelligent power distribution network communication system Access Layer construction.
It is very unfavorable that existing intelligent distribution network clock synchronization system highly relies on for fail safe GPS, and intelligent distribution network to have a site many and disperse, have a very wide distribution, the characteristics such as circumstance complication, if install the GPS device at each distribution terminal place, there is very large challenge aspect economy and feasibility.
Summary of the invention
According to above deficiency of the prior art, the problem to be solved in the present invention is: provide a kind of technology simple, operating cost is low, time precision is high, little to the GPS dependence, can meet intelligent distribution network clock synchronization system and the method based on the PTN+EPON communication system of intelligent distribution network time synchronized.
The technical solution adopted for the present invention to solve the technical problems is:
The described intelligent distribution network clock synchronization system based on the PTN+EPON communication system, comprise the precision clock source apparatus, the master clock port of precision clock source apparatus by the IEC61588 agreement connect local side PTN equipment from clock port, the master clock port of local side PTN equipment successively with a plurality of transformer stations in the PTN equipment cascading form a loop configuration, the master clock port connection route device of the PTN equipment in described transformer station, router by switch connect OLT equipment from clock port, OLT equipment connects ONU equipment by optical fiber, the master clock port of ONU equipment is connected with distribution terminal.
The described intelligent distribution network clock synchronization system based on the PTN+EPON communication system is characterised in that whole power distribution network transmits precise time step by step by communication system, makes whole intelligent distribution network realize time synchronized.Distribution network communication system is divided into backbone layer and Access Layer from structure, the present invention by the IEC61588 technology be incorporated into distribution network automated to the time system in, at the multiplexing PTN network of backbone layer, at the multiplexing EPON network of Access Layer, the IEC61588 technique guarantee network time synchronization precision, and lower the dependence of distribution network to gps system, improved safety and reliability.Junction at backbone layer and Access Layer, message is passed to the EPON equipment of Access Layer by switch and router, switch and router device only play the effect of converging with route, the accumulated error too much produced in order to reduce boundary clock progression, these two equipment all are configured to transparent clock, realize the transparent transmission of clock message.On backbone layer, main website local side PTN equipment and transformer station configure respectively PTN equipment and carry out the looping net; key looped network is used 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 channel.
Wherein preferred version is:
Described precision clock source apparatus is GPS device or Big Dipper device or GPS/ Big Dipper device, and high-stability constant-temperature crystal oscillator and GPS and Big Dipper reception antenna are set on the precision clock source apparatus.Using the GPS/ dipper system standby clock source as system each other, adopt high-stability constant-temperature crystal oscillator (OCXO) as local clock, use GPS and dipper system to carry out calibrating frequency to high stability crystal oscillator and realize synchronous.If GPS and dipper system be disturbed can not normally the use all, high stability crystal oscillator enters hold mode automatically, continues to provide high accuracy frequency and time signal output, to maintain the normal operation of system.
Described OLT equipment connects a plurality of ONU equipment by optical splitter.Can pass through as required a plurality of distribution terminals of ONU equipment access.
The interface of described distribution terminal adopts single network interface or two network interface.Distribution terminal is joined (Feeder Terminal Unit, FTU) two network interfaces of standby usage are arranged, during normal operation, FTU accepts the synchronizing information from primary network interface, when primary network interface breaks down can not receiving synchronous information the time, FTU automatically switches to standby network interface, continues to receive the synchronizing information from ONU.
Described ONU equipment arranges primary and backup two PON interfaces.Two PON interfaces of standby usage are arranged on each ONU, receive and come from two sync messages on optical cable respectively, when system is normally moved, ONU receives the synchronizing information from primary PON mouth, when the faults such as generation optical cable broken string, primary PON mouth does not receive the information that comes from OLT, in 50ms, switch to standby PON mouth, receive the synchronizing information from spare OLT.So, just can complete the switching of IEC61588 at the Access Layer communication port, guaranteed to the time system reliability.
The formed EPON system topology of described OLT equipment connection ONU equipment adopts bus-type or pulls hand-type or OLT double-PON port type.The standby usage OLT that pulls hand-type redundancy group net is configured in respectively in two transformer stations, and this mode is applicable to the power distribution equipment between the Liang Ge transformer station of geographical position; The standby usage OLT of OLT double-PON port type redundancy networking is configured in same transformer station, can be two PTN equipment, can be also two PON interfaces of an equipment, this mode can realize by 2 core fibres, generally be applicable on the Distributing Terminal Assembly of various positions.
Described PTN equipment adopts boundary clock, and router and switch adopt transparent clock, and OLT equipment and ONU equipment are configured to boundary clock jointly.PTN equipment adopts the boundary clock model, and boundary clock can transmit temporal information step by step, plays the effect of separating the PTP subdomain.The router of backbone layer and Access Layer junction and switch adopt the transparent clock model, and transparent clock can reduce the accumulated error of clock node to the PTP message, improve timing tracking accuracy.EPON equipment adopts OLT(optical line terminal, optical line terminal) and ONU(Optical Network Unit, optical network unit) jointly be configured to the boundary clock model, principal and subordinate's timing tracking accuracy can reach 100ns, meets the requirement of intelligent distribution network to synchronization accuracy.
PTN equipment connection GPS/ Big Dipper precision clock source apparatus in described transformer station.At transformer station with good conditionsi place, the standby clock source is set, each clock node is realized the automatic selection to clock source by the best master clock algorithm in each self-operating IEC61588.
The described intelligent distribution network method for synchronizing time based on the PTN+EPON communication system, its step comprises:
1) using GPS/ Big Dipper device as the precision clock source apparatus, high-stability constant-temperature crystal oscillator, as local clock, carries out calibrating frequency by GPS and dipper system to high-stability constant-temperature crystal oscillator and realizes synchronous;
2) message of the precision clock with temporal information that the precision clock source apparatus generates, pass to local side PTN equipment by the IEC61588 port, local side PTN equipment is by receiving the precision clock message from clock port, and extract the time information renovation local clock in message, this message that simultaneously terminates, local side PTN equipment is set to the boundary clock model;
The precision clock message of the temporal information with local clock that 3) local side PTN equipment will generate passes to the PTN equipment in transformer station, PTN equipment in transformer station is by receiving the precision clock message from clock port, and extract the time information renovation local clock in message, this message that simultaneously terminates, the PTN equipment in transformer station is set to the boundary clock model;
The precision clock message of the temporal information with local clock that 4) the PTN equipment in transformer station generates, on the one hand this message is passed to the PTN equipment in next transformer station by second line of a couplet network interface as master clock information, until end after the message information that local side PTN equipment Inspection is transmitted to last transformer station, and abandon this message information, again form new precision clock source and continue to transmit successively; The OLT equipment of the EPON equipment that router and the switch by backbone layer passes to Access Layer by this message on the other hand, router and switch configuration are the transparent clock model;
When 5) the precision clock message is delivered to Access Layer EPON equipment, at first by the distance measurement function of EPON internal system, OLT equipment is realized synchronizeing with connected ONU equipment, OLT equipment is set to the boundary clock pattern jointly be connected ONU equipment;
6) after realizing OLT equipment and ONU device synchronization, OLT equipment is by receiving the precision clock message of coming from the switch transparent transmission from clock interface, upgrade the temporal information of OLT equipment, then by the distance measurement function of EPON system, upgrade the local clock of ONU equipment simultaneously;
7) ONU equipment is now as master clock, and ONU equipment generates new PTP message according to local clock, by second line of a couplet network interface, message is issued to distribution terminal equipment.
The beneficial effect that the present invention has is:
Described intelligent distribution network clock synchronization system based on the PTN+EPON communication system and method solved existing intelligent distribution network to the time system to the problems such as height dependence of GPS.Only GPS is used as to clock source, application IEC61588 technology, in the multiplexing PTN technology of backbone layer, the multiplexing EPON technology of Access Layer, by communication system, precise time is transmitted step by step, thereby make whole intelligent distribution network realize time synchronized, improved network time synchronization precision, lower the dependence of power distribution network to gps system, improved safety and reliability.The system master clock source is arranged on to power distribution automation main website place, at transformer station with good conditionsi place, the standby clock source is set in addition, by each timing node automatically select its in order to synchronous clock source.Intelligent power distribution network communication system for backbone layer application PTN technology and Access Layer application EPON technology, backbone layer PTN equipment is set to the boundary clock pattern, the OLT of Access Layer EPON system and ONU are configured to the boundary clock pattern jointly, be the transparent clock pattern by the router of backbone layer and Access Layer junction and switch configuration, realize the classifying rationally in PTP territory.The invention provides a kind of time precision and be better than in theory 1 microsecond, little to the dependence of GPS, can meet the requirement of intelligent distribution network to time synchronized, simple in structure, the intelligent distribution network clock synchronization system that practicality is high.
The accompanying drawing explanation
Fig. 1 is that precision clock of the present invention transmits schematic diagram step by step;
Fig. 2 is system configuration topological diagram of the present invention;
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described further:
As Fig. 1, shown in Fig. 2, intelligent distribution network clock synchronization system based on the PTN+EPON communication system of the present invention, comprise the precision clock source apparatus, the precision clock source apparatus is GPS device or Big Dipper device or GPS/ Big Dipper device, high-stability constant-temperature crystal oscillator and GPS and Big Dipper reception antenna are set on the precision clock source apparatus, the master clock port of precision clock source apparatus by the IEC61588 agreement connect local side PTN equipment from clock port, the master clock port of local side PTN equipment successively with a plurality of transformer stations in the PTN equipment cascading form a loop configuration, the master clock port connection route device of the PTN equipment in described transformer station, router by switch connect OLT equipment from clock port, OLT equipment connects ONU equipment by optical fiber, the master clock port of ONU equipment is connected with distribution terminal.
Wherein, as shown in Figure 2, OLT equipment connects a plurality of ONU equipment by optical splitter POS, and ONU equipment arranges primary and backup two PON interfaces, and the formed EPON system topology of OLT equipment connection ONU equipment adopts bus-type or pulls hand-type or OLT double-PON port type.The interface of distribution terminal adopts single network interface or two network interface, and PTN equipment adopts boundary clock, and router and switch adopt transparent clock, and OLT equipment and ONU equipment are configured to boundary clock jointly.PTN equipment connection GPS/ Big Dipper precision clock source apparatus in transformer station.
Intelligent distribution network method for synchronizing time based on the PTN+EPON communication system, its key step is:
1) using GPS/ Big Dipper device as the precision clock source apparatus, high-stability constant-temperature crystal oscillator, as local clock, carries out calibrating frequency by GPS and dipper system to high-stability constant-temperature crystal oscillator and realizes synchronous;
2) message of the precision clock with temporal information that the precision clock source apparatus generates, pass to local side PTN equipment by the IEC61588 port, local side PTN equipment is by receiving the precision clock message from clock port, and extract the time information renovation local clock in message, this message that simultaneously terminates, local side PTN equipment is set to the boundary clock model;
The precision clock message of the temporal information with local clock that 3) local side PTN equipment will generate passes to the PTN equipment in transformer station, PTN equipment in transformer station is by receiving the precision clock message from clock port, and extract the time information renovation local clock in message, this message that simultaneously terminates, the PTN equipment in transformer station is set to the boundary clock model;
The precision clock message of the temporal information with local clock that 4) the PTN equipment in transformer station generates, on the one hand this message is passed to the PTN equipment in next transformer station by second line of a couplet network interface as master clock information, until end after the message information that local side PTN equipment Inspection is transmitted to last transformer station, and abandon this message information, again form new precision clock source and continue to transmit successively; The OLT equipment of the EPON equipment that router and the switch by backbone layer passes to Access Layer by this message on the other hand, router and switch configuration are the transparent clock model;
When 5) the precision clock message is delivered to Access Layer EPON equipment, at first by the distance measurement function of EPON internal system, OLT equipment is realized synchronizeing with connected ONU equipment, OLT equipment is set to the boundary clock pattern jointly be connected ONU equipment;
6) after realizing OLT equipment and ONU device synchronization, OLT equipment is by receiving the precision clock message of coming from the switch transparent transmission from clock interface, upgrade the temporal information of OLT equipment, then by the distance measurement function of EPON system, upgrade the local clock of ONU equipment simultaneously;
7) ONU equipment is now as master clock, and ONU equipment generates new PTP message according to local clock, by second line of a couplet network interface, message is issued to distribution terminal equipment.
The present invention is used as clock source by GPS, application IEC61588 technology, in the multiplexing PTN technology of backbone layer, the multiplexing EPON technology of Access Layer, by communication system, precise time is transmitted step by step, make whole intelligent distribution network realize time synchronized, improved network time synchronization precision, lower the dependence of power distribution network to gps system, improved safety and reliability.
Claims (9)
1. the intelligent distribution network clock synchronization system based on the PTN+EPON communication system, it is characterized in that: comprise the precision clock source apparatus, the master clock port of precision clock source apparatus by the IEC61588 agreement connect local side PTN equipment from clock port, the master clock port of local side PTN equipment successively with a plurality of transformer stations in the PTN equipment cascading form a loop configuration, the master clock port connection route device of the PTN equipment in described transformer station, router by switch connect OLT equipment from clock port, OLT equipment connects ONU equipment by optical fiber, the master clock port of ONU equipment is connected with distribution terminal.
2. the intelligent distribution network clock synchronization system based on the PTN+EPON communication system according to claim 1, it is characterized in that: described precision clock source apparatus is GPS device or Big Dipper device or GPS/ Big Dipper device, and high-stability constant-temperature crystal oscillator and GPS and Big Dipper reception antenna are set on the precision clock source apparatus.
3. the intelligent distribution network clock synchronization system based on the PTN+EPON communication system according to claim 1, it is characterized in that: described OLT equipment connects a plurality of ONU equipment by optical splitter.
4. the intelligent distribution network clock synchronization system based on the PTN+EPON communication system according to claim 1, it is characterized in that: the interface of described distribution terminal adopts single network interface or two network interface.
5. the intelligent distribution network clock synchronization system based on the PTN+EPON communication system according to claim 1, it is characterized in that: described ONU equipment arranges primary and backup two PON interfaces.
6. the intelligent distribution network clock synchronization system based on the PTN+EPON communication system according to claim 1 is characterized in that: the formed EPON system topology of described OLT equipment connection ONU equipment adopts bus-type or pulls hand-type or OLT double-PON port type.
7. the intelligent distribution network clock synchronization system based on the PTN+EPON communication system according to claim 1, it is characterized in that: described PTN equipment adopts boundary clock, router and switch adopt transparent clock, and OLT equipment and ONU equipment are configured to boundary clock jointly.
8. the intelligent distribution network clock synchronization system based on the PTN+EPON communication system according to claim 1, is characterized in that: the PTN equipment connection GPS/ Big Dipper precision clock source apparatus in described transformer station.
9. the intelligent distribution network method for synchronizing time based on the PTN+EPON communication system, its step comprises:
1) using GPS/ Big Dipper device as the precision clock source apparatus, high-stability constant-temperature crystal oscillator, as local clock, carries out calibrating frequency by GPS and dipper system to high-stability constant-temperature crystal oscillator and realizes synchronous;
2) message of the precision clock with temporal information that the precision clock source apparatus generates, pass to local side PTN equipment by the IEC61588 port, local side PTN equipment is by receiving the precision clock message from clock port, and extract the time information renovation local clock in message, this message that simultaneously terminates, local side PTN equipment is set to the boundary clock model;
The precision clock message of the temporal information with local clock that 3) local side PTN equipment will generate passes to the PTN equipment in transformer station, PTN equipment in transformer station is by receiving the precision clock message from clock port, and extract the time information renovation local clock in message, this message that simultaneously terminates, the PTN equipment in transformer station is set to the boundary clock model;
The precision clock message of the temporal information with local clock that 4) the PTN equipment in transformer station generates, on the one hand this message is passed to the PTN equipment in next transformer station by second line of a couplet network interface as master clock information, until end after the message information that local side PTN equipment Inspection is transmitted to last transformer station, and abandon this message information, again form new precision clock source and continue to transmit successively; The OLT equipment of the EPON equipment that router and the switch by backbone layer passes to Access Layer by this message on the other hand, router and switch configuration are the transparent clock model;
When 5) the precision clock message is delivered to Access Layer EPON equipment, at first by the distance measurement function of EPON internal system, OLT equipment is realized synchronizeing with connected ONU equipment, OLT equipment is set to the boundary clock pattern jointly be connected ONU equipment;
6) after realizing OLT equipment and ONU device synchronization, OLT equipment is by receiving the precision clock message of coming from the switch transparent transmission from clock interface, upgrade the temporal information of OLT equipment, then by the distance measurement function of EPON system, upgrade the local clock of ONU equipment simultaneously;
7) ONU equipment is now as master clock, and ONU equipment generates new PTP message according to local clock, by second line of a couplet network interface, message is issued to distribution terminal equipment.
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