CN203554472U - Intelligent power distribution network IEEE 1588 timing synchronization system based on industrial Ethernet straight connection access ring - Google Patents
Intelligent power distribution network IEEE 1588 timing synchronization system based on industrial Ethernet straight connection access ring Download PDFInfo
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Abstract
The utility model relates to a power distribution network timing synchronization system, and especially relates to an intelligent power distribution network IEEE 1588 timing synchronization system based on an industrial Ethernet straight connection access ring; the intelligent power distribution network IEEE 1588 timing synchronization system comprises a backbone layer and an access layer; a main station gateway switch of the backbone layer is connected with an upper network transmission precision clock device; the main station gateway switch is connected with sub-station switches to form an annular structure; a first gateway switch and a second gateway switch of the access layer are connected on two sides of the sub-station switches and then connected with access layer switches so as to form an annular structure; the main station gateway switch, the first gateway switch and the second gateway switch are arranged as boundary clocks; the sub-station switches and the access layer switches are arranged as transparent clocks; a power distribution terminal device is a normal clock. The intelligent power distribution network IEEE 1588 timing synchronization system based on industrial Ethernet straight connection access ring is simple in technology, high in timing precision, small in GPS dependency, saves cost, is good in divergence, wide in covering area, can well suit the straight connection access ring of the access layer, and can satisfy timing synchronization requirements of the intelligent power distribution network.
Description
Technical field
Synchro system when the utility model relates to a kind of distribution network school, particularly synchro system during a kind of intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet.
Background technology
Each backbone node timing tracking accuracy of current power transmission network has reached higher standard, and the middle pressure node time synchronization accuracy that distribution automation covers is still lower.In the construction of intelligent distribution network; the intelligent distribution network wide area observing and controlling system with synchronized phasor acquisition function is the critical support technology of intelligent distribution network; realize the technology such as intelligent distribution network safety analysis and monitoring platform construction, intelligent distribution network wide area protection and incident management, the seamless self-healing of intelligent distribution network and must allow the correcting delay precision of power distribution network reach Microsecond grade, so research has important practical significance to intelligent distribution network exact time synchronization System Construction.
The time synchronized research of current power system be take the automation of transformation substations as main, and the main technology adopting has: GPS to time, pulse per second (PPS) to time, IRIG-B code, SNTP SNTP, accurate time synchronization protocol PTP etc.Wherein GPS synchronization accuracy is high, but cost costliness is not suitable for applying in power distribution network great deal of nodes, and its stability fail safe is very unreliable yet; Pulse per second (PPS) and IRIG-B code synchronism also can reach degree of precision, but need additionally to time special circuit, cannot be applied in the distributed system that this span length of power distribution network is larger; SNTP network message synchronously to time precision can only reach ms level.IEEE1588 is again the accurate time synchronization protocol PTP of distributed control and measuring system, it wraps and at bottom, beats timestamp and come synchronizing network to reach the time precision of submicrosecond level during by school in Ethernet, this agreement can multiplexing ethernet communication network, low to resource occupation, without laying additional wires, can reduce system Construction cost.The application study of IEEE1588 in electric power system at present concentrates on automation of transformation substations field mostly, and the application in power distribution network is in the starting stage.And existing a large amount of switch product of the support IEEE1588 agreement of producer's maturation both at home and abroad.
Optical fiber communication becomes the one preferred technique of distribution network communication system with reliable and stable communication qualities such as its large capacity bandwidth, strong anti-interference ability, relatively cheap cost, low error rate, two-forty, good confidentiality.Along with rolling up of IP operation, fiber optic Ethernet technology becomes gradually one preferred technique in distribution network communication system backbone layer and Access Layer.With gigabit ethernet ring network, build power distribution automation backbone network, the scheme that builds power distribution automation Access Network with 100,000,000 Industrial Ethernet looped networks becomes the typical scenario that distribution network automated communication system is built.The utility model is basis with regard to this typical scenario, system while studying the multiplexing school based on fiber optic Ethernet technology distribution network communication system of a kind of IEEE1588 of employing.
Utility model content
According to above deficiency of the prior art, problem to be solved in the utility model is: provide that a kind of technology is simple, time precision is high,, not only cost saving divergence little to GPS dependence but good, cover that region is wide, especially to adapt to Access Layer be direct-connected access ring structure, synchro system during the intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet that can meet that intelligent distribution network time synchronized requires.
The utility model solves the technical scheme that its technical problem adopts:
Synchro system during the described intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet, comprise backbone layer and Access Layer, backbone layer comprises that Yi Ge main website closes mouth switch and a plurality of substations switch, main website closes mouth switch connection higher level nets biography precision clock device, main website closes mouth switch and substation switch is connected to form loop configuration by kilomega optic fiber interface, Access Layer comprises the first pass mouth switch, second closes mouth switch and a plurality of access-layer switch, first closes mouth switch and second closes mouth switch and is connected to the substation switch two rear flank formation loop configuration that is connected with access-layer switch again by 100,000,000 optical fiber interfaces, first closes mouth switch, second closes mouth switch is all connected Distributing Terminal Assembly with access-layer switch, main website closes mouth switch, the first pass mouth switch and the second critical point switch configuration are boundary clock, substation switch and access-layer switch are set to transparent clock, Distributing Terminal Assembly is set to ordinary clock.
In the unified school in precision clock source at present, backbone layer communication looped network covers distribution main website (districts and cities control centre) and distribution substation (each transformer station), it is that the first pass mouth switch and the second pass mouth switch directly access the substation switch of local communication convergent point backbone layer net from both sides that Access Layer looped network closes mouth switch by two of this layers, two pass mouth switchs are added a complete access ring of substation switch formation of backbone layer by connecting other all access-layer switch, cover each switching station of communication sink accumulation, ring main unit, distribution substation, on-pole switch, finally formed the mechanism that IEEE1588 agreement is successively transmitted in the large ring of backbone layer and the structure of the direct-connected access of the little ring of a plurality of Access Layer.In the large ring of backbone layer, the telephone net node that selection is positioned at main website is defined as the pass mouth switch of this layer, and main website closes mouth switch, and clock type is chosen as boundary clock BC, other nodes are substation switch, and clock type is chosen as transparent clock TC(P2P pattern).In the little ring of Access Layer, select first to close mouth switch and the second pass mouth switch (each direct-connected access ring has two and closes mouth switchs), clock type is chosen as boundary clock BC, other access-layer switch nodal clock type selecting are transparent clock TC(P2P pattern), Distributing Terminal Assembly is set to ordinary clock OC.Boundary clock BC node is the border of subdomain while cutting apart PTP school, it can form clear in structure, many levels clearly demarcated, relatively independent, to time process easy PTP subdomain, by last layer, be lower one deck while coming the school of one-level one-level, while finally forming a clock school, set system.The Sync message transmission cycle of each PTP subdomain is generally 2 seconds, and clocking error local in these two seconds can accumulate gradually, until upgrade next time.And lower one deck can add in the error of accumulation in local 2 seconds the error of last layer accumulation in 2 seconds, more multiple error accumulation must be more for level.Close mouth switch and be equivalent to the critical point that a clock information flows, junction at loop network and the superior and the subordinate's network is all guarded by closing mouth switch, be set to boundary clock BC, while making the school of this layer and its levels, system separates, form relatively independent PTP subdomain, the communication network of each level is whole during as a large school, by the critical point convertor boundary clock BC of this layer, go on the air while sending school and wrap, in this layer during all school information can by the error free accumulation of transparent clock TC be sent on this layer of all timing node.By critical point switch configuration, be boundary clock BC the flowing of information can also block different layers inter-stage school time, alleviated the communications burden of circuit and equipment, strengthen the stability of timing system.By this method divided clock school time domain, during school, information is delivered at district level backbone layer on its terminal equipment of 10KV distribution Access Layer and only need to passes through two-layer PTP school time domain.So both guaranteed time correction error to be controlled in minimum zone network in the time of forming again wide area multilayer that a scale can arbitrary extension and unify school.
Preferred further, the main website of backbone layer closes on mouth switch GPS device is set, and Big Dipper device is set on the switch of substation.When main website closes mouth switch cannot normally receive higher level and net the message information that passes precision clock device time, can close the GPS device arranging on mouth switch while carrying out school according to main website, do not need each website to be equipped with GPS device, only need on the pass mouth switch of every layer, arrange, not only the stability of timing system can be guaranteed, the cost of timing system can also be reduced; Net the message information that passes precision clock device cannot normally receive higher level, when the GPS device of main website pass mouth switch also breaks down, in the time of can carrying out school by the Big Dipper device arranging on the switch of substation, not all substation switch is all provided with Big Dipper device, we can optionally arrange as required, reduce the cost of timing system.
Preferred further, the first critical point switch configuration of Access Layer be boundary clock as the first local clock, the second critical point switch configuration is that boundary clock is as the second local clock.In the time cannot normally receiving the message information of higher level's precision clock device, while carrying out school by the local clock arranging on the first pass mouth switch and the second pass mouth switch.
Preferred further, main website closes mouth switch and substation switch all adopts three layers of industrial ethernet switch.First closes mouth switch, the second pass mouth switch and access-layer switch all adopts two layers of industrial ethernet switch.
Preferred further, substation switch and access-layer switch are set to point-to-point transparent transmission mode.It is in order further to alleviate circuit and devices communicating burden that the transparent clock TC of substation switch and access-layer switch is set to point-to-point (P2P) transparent clock.During point-to-point (P2P), path delay shake between neighbouring device is all recorded in node by the Timing measurement of fixed cycle, when the timestamp information of master clock transmission is delivered to from clock, whole path delay shake and the shake of switch protocol stack are all added in this master clock information, the local zone time of the Sync message that only need to receive according to oneself from clock, just can accurately calculate with the time error of master clock and adjust oneself, do not need to send again Delay-Request, Delay-Response and so on subsequent packet, be equivalent to master clock unidirectional when sending school from clock information, no longer use ping-pong procedure.E2E transparent clock is still equivalent to measure whole path delay shake with ping-pong procedure, and when network topology change (protection is switched), of short duration relatively large deviation may appear in E2E transparent clock synchronization accuracy, can cause the malfunction of protective device.
Preferred further, the clock source priority of backbone layer is followed successively by from high to low higher level and nets and pass precision clock device, main website and close GPS device on mouth switch and the Big Dipper device on the switch of substation.The clock source priority of Access Layer is followed successively by from high to low higher level and nets the first local clock passing on precision clock device, the first pass mouth switch, and second closes the second local clock on mouth switch.
The beneficial effect that the utility model has is:
System layering when synchro system is by rational school during the described intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet, the high effect of expansibility of network size degree while reaching school, the timing node type of choose reasonable, while reaching school, level quantity is few, accumulated error is little, circuit and node load suitably, well adapt to the effect that Access Layer is direct-connected access ring structure.Use multiple clock source is standby, strengthens the robustness of system, in injection length source, appropriate place, makes backbone layer can save a large amount of GPS correction devices.By prioritization is carried out in different clocks source, higher level's communication node clock signal is one-level, main website clock source is secondary, substation clock source is made as three grades, while making system determine a time source as master clock school all the time according to time source quality by BMC algorithm, select suitable clock source decanting point, reduce district level backbone layer clock source quantity.By Access Layer pass mouth switch is set, be BC, if Access Layer time of occurrence isolated island, the unified clock that can establish a time isolated island, reduces impact as far as possible.
The utility model adopts IEEE1588 technology, multiplexing Industrial Ethernet communication system, system layering during by rational school, select suitable clock node type, one of final formation covers all distribution automation terminal nodes, higher level or local main website precision clock source are master clock, multiple clock source is standby, can transmit step by step precision clock, when switching, network redundancy automatically forms new Clock Tree, precision is better than 1 microsecond, divergence is good, network when the wide area multilayer that good adaptation Access Layer is direct-connected access ring is unified distribution network school, for intelligent distribution network wide area TT&C system construction service.
Accompanying drawing explanation
Fig. 1 is system configuration topological diagram of the present utility model;
Fig. 2 is that precision clock of the present utility model successively transmits schematic diagram;
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further:
As Fig. 1, shown in Fig. 2, synchro system during the intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet described in the utility model, comprise backbone layer and Access Layer, it is characterized in that: backbone layer comprises that Yi Ge main website closes mouth switch and a plurality of substations switch, main website closes mouth switch connection higher level nets biography precision clock device, main website closes mouth switch and substation switch is connected to form loop configuration by kilomega optic fiber interface, Access Layer comprises the first pass mouth switch, second closes mouth switch and a plurality of access-layer switch, first closes mouth switch and second closes mouth switch and is connected to the substation switch two rear flank formation loop configuration that is connected with access-layer switch again by 100,000,000 optical fiber interfaces, first closes mouth switch, second closes mouth switch is all connected Distributing Terminal Assembly with access-layer switch, main website closes mouth switch, the first pass mouth switch and the second critical point switch configuration are boundary clock, substation switch and access-layer switch are set to transparent clock, Distributing Terminal Assembly is set to ordinary clock,
During intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet, synchronous method step is as follows:
1) main website of backbone layer closes mouth switch and receives the clock source message of netting biography precision clock device from higher level, by being boundary clock by main website critical point switch configuration, main website closes after mouth switch receives higher level's time message this message is terminated, and then main website closes mouth switch according to received information updating local clock;
2) main website of backbone layer closes the local clock of mouth switch after upgrading as master clock, by master clock port, message information is sent to other the substation switch being connected on backbone layer, substation switch is all set to transparent clock, after receiving message information, do not upgrade the clock of self, be equivalent to directly message information is forwarded to other substation switch;
3) main website closes mouth switch when message information is communicated to substation switch, when main website closes the school of mouth switch, clock sends to the switch in Access Layer through substation switch, if loop resistance is disconnected, appear between two access-layer switch that are connected, when main website closes the school of mouth switch, clock sends to the first pass mouth switch and second simultaneously and closes mouth switch, the first pass mouth switch and second closes mouth switch and is all set to boundary clock, the first pass mouth switch and second closes after mouth switch receives message information and upgrades respectively local clock, local clock after upgrading respectively as master clock send to coupled access-layer switch and with the first pass mouth switch, when the Distributing Terminal Assembly that the second pass mouth switch is connected with access-layer switch carries out school, if occur before the second pass mouth switch and substation switch, loop resistance is disconnected, when main website closes the school of mouth switch, clock penetrated substation switch and sends to first of Access Layer and close mouth switch, after the first pass mouth switch deadline is synchronous, itself is as master clock, send to connected other access-layer switch, second to close mouth switch and close mouth switch with access-layer switch, first message information and close with second the Distributing Terminal Assembly that mouth switch is connected, access-layer switch is all set to transparent clock.
Wherein, the main website of backbone layer closes on mouth switch GPS device is set, Big Dipper device is set on the switch of substation, the first critical point switch configuration of Access Layer be boundary clock as the first local clock, the second critical point switch configuration is that boundary clock is as the second local clock.Main website closes mouth switch and substation switch all adopts three layers of industrial ethernet switch, and first closes mouth switch, the second pass mouth switch and access-layer switch all adopts two layers of industrial ethernet switch.Substation switch and access-layer switch are set to point-to-point transparent transmission mode.
The clock source priority of backbone layer is followed successively by from high to low higher level and nets and pass precision clock device, main website and close GPS device on mouth switch and the Big Dipper device on the switch of substation, the clock source priority of Access Layer is followed successively by from high to low higher level and nets the first local clock passing on precision clock device, the first pass mouth switch, and second closes the second local clock on mouth switch.
Operation principle:
Distribution network communication system is divided into backbone layer and Access Layer, and this is two-layer.Backbone layer communication network covers distribution main website (districts and cities control centre) and distribution substation (each transformer station), and the connection between main website and the switch of transformer station's duty all adopts IEEE1588 agreement.As shown in Figure 1, as backbone layer, backbone network design adopts three layers of industrial ethernet switch, by kilomega optic fiber interface, forms loop network, enables dynamic routing protocol in loop network, realizes data route and dynamically forwards.Access Layer is mainly used in the access of 10KV power distribution network terminals at different levels, covers each switching station, ring main unit, distribution substation, on-pole switch etc.Access Layer is comprised of two layers of industrial ethernet switch in each communication sink accumulation institute overlay area, according to the regional extent covering, divide different corresponding subrings, this ring is direct-connected access ring, these ring two ends are closed mouth switch by two respectively and are accessed on the backbone network three-tier switch of local communication convergent point, two pass mouth switchs are added backbone layer switch by connecting other all these layer switch, form a complete access ring.
In the large ring of backbone layer, the telephone net node of selecting to be positioned at main website is defined as the pass mouth switch of this layer, and clock type is chosen as boundary clock BC, and other nodes are as transparent clock TC(P2P pattern).In the little ring of Access Layer, select to close mouth switch as boundary clock BC, other telephone net nodes are as transparent clock TC(P2P pattern).Station exchange receives higher level and nets while passing precision clock or GPS precision clock source signal to the local clock school of this node, and main website backbone layer switch, using local clock as master clock, sends to message other substation switch being connected on backbone network.Because substation switch configuration is transparent clock TC, the clock of self does not upgrade, while being equivalent to school that master clock port now sends, message arrives through transparent clock TC on the pass mouth switch of next transparent clock TC or coupled Access Layer, in the time of can completing once school to the pass mouth switch of all Access Layers during end cycle when a school of this layer.The pass mouth switch of all Access Layers has completed after time synchronized, while itself being re-used as master clock high-ranking officers, message sends to other switch of connection or the distribution terminal equipment of itself, and during this school, message arrives on next transparent clock TC or coupled Distributing Terminal Assembly through connected transparent clock TC.Clock school time domain cut apart with node configuration as shown in Figure 2, according to this, cut apart network can form a wide area multilayer and unify school with configuration mode time.
Backbone layer clock source injects the realization with redundancy: during backbone layer school, the master clock of network is that main website closes the communication interface that mouth switch is connected higher level's backbone network, by this mouthful, receive higher level and net biography precision clock, local clock to this switch is synchronous, and then when all BC of network broadcast school when connecting this layer of school.Standby clock source is to be connected to main website close the synchronous timing device of gps satellite on mouth switch and be connected to the synchronous timing device of big-dipper satellite on other substation switch of backbone layer.Clock source priority sets gradually respectively as: higher level nets and passes precision clock, closes the GPS device on mouth switch, Big Dipper device and the local clock on the backbone switch of substation.When master clock lost efficacy, node, by BMC algorithm, automatically upgrades and is switched to secondary standby clock source, makes it become new master clock, thereby sets while forming new school.Key loop makes it at diagram logical connection place, disconnect by network management system, system while forming a tree-shaped school.
The realization of the injection of Access Layer clock source and redundancy: during the direct-connected access ring of communication network, two critical point switch configurations, be boundary clock BC, wherein the first priority of closing mouth switch will be higher than the second pass mouth switch, and the formation meeting of time synchronized tree is more convenient like this, while avoiding school, conflicts.During normal condition, by higher level, netted when passing precision clock and closing mouth switch school to one of them, then while closing mouth switch school by it to all Distributing Terminal Assemblies and second.Circuit initial ring when protection, by higher level, netted while passing precision clock respectively to the mouth switch school, pass on both sides, then given while being connected separately PTP subdomain school by them.Time is during isolated island, by pass mouth switch on one side as master clock source during to all Distributing Terminal Assemblies and another mouth switch school, pass.Simultaneously when time of origin isolated island and protecting circuit loop, be equivalent to form two time isolated islands, each pass mouth switch by it is during as master clock source school.
The utility model adopts layering principle, each communication loop (comprising the large ring of backbone layer and the little ring of Access Layer) is seen and made a clock school time domain, in each clock school time domain, select a small amount of telephone net node clock type to be set to BC, as the master clock in the time domain of this clock school; Other Node configurations are TC.In the time of can reaching system school like this, level quantity is few, the accumulation of error is little, circuit and the suitable effect of node load, technology is simple, time precision is high,, not only cost saving divergence little to GPS dependence but good, cover that region is wide, well to adapt to Access Layer be direct-connected access ring, can meet the requirement of intelligent distribution network time synchronized.
Claims (8)
1. synchro system during an intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet, comprise backbone layer and Access Layer, it is characterized in that: backbone layer comprises that Yi Ge main website closes mouth switch and a plurality of substations switch, main website closes mouth switch connection higher level nets biography precision clock device, main website closes mouth switch and substation switch is connected to form loop configuration by kilomega optic fiber interface, Access Layer comprises the first pass mouth switch, second closes mouth switch and a plurality of access-layer switch, first closes mouth switch and second closes mouth switch and is connected to the substation switch two rear flank formation loop configuration that is connected with access-layer switch again by 100,000,000 optical fiber interfaces, first closes mouth switch, second closes mouth switch is all connected Distributing Terminal Assembly with access-layer switch, main website closes mouth switch, the first pass mouth switch and the second critical point switch configuration are boundary clock, substation switch and access-layer switch are set to transparent clock, Distributing Terminal Assembly is set to ordinary clock.
2. synchro system during the intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet according to claim 1, is characterized in that: the main website of described backbone layer closes on mouth switch GPS device is set, and Big Dipper device is set on the switch of substation.
3. synchro system during the intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet according to claim 1, it is characterized in that: the first critical point switch configuration of described Access Layer be boundary clock as the first local clock, the second critical point switch configuration is that boundary clock is as the second local clock.
4. synchro system during the intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet according to claim 1 and 2, is characterized in that: described main website closes mouth switch and substation switch all adopts three layers of industrial ethernet switch.
5. synchro system during according to intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet described in claim 1 or 3, is characterized in that: described first closes that mouth switch, second closes mouth switch and access-layer switch all adopts two layers of industrial ethernet switch.
6. synchro system during the intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet according to claim 1, is characterized in that: described substation switch and access-layer switch are set to point-to-point transparent transmission mode.
7. synchro system during the intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet according to claim 1 and 2, is characterized in that: the clock source priority of described backbone layer is followed successively by from high to low higher level and nets and pass precision clock device, main website and close GPS device on mouth switch and the Big Dipper device on the switch of substation.
8. synchro system during according to intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet described in claim 1 or 3, it is characterized in that: the clock source priority of described Access Layer is followed successively by from high to low higher level and nets the first local clock passing on precision clock device, the first pass mouth switch, and second closes the second local clock on mouth switch.
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