CN103532231B - Intelligent power distribution network IEEE1588 timing synchronization system on basis of industrial Ethernet direct connection access rings - Google Patents
Intelligent power distribution network IEEE1588 timing synchronization system on basis of industrial Ethernet direct connection access rings Download PDFInfo
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Abstract
The invention relates to a power distribution network timing synchronization system, in particular to an intelligent power distribution network IEEE1588 timing synchronization system on the basis of industrial Ethernet direct connection access rings. The intelligent power distribution network IEEE1588 timing synchronization system comprises a backbone layer and access layers; a master station gateway exchanger of the backbone layer is connected with a superior network transmission accurate clock device; the master station gateway exchanger is connected with sub-station exchangers to form a ring-shaped structure; after being connected to both sides of the sub-station exchangers, first gateway exchangers and second gateway exchangers of the access layers are connected with corresponding access layer exchangers to form ring-shaped structures; the master station gateway exchanger, the first gateway exchangers and the second gateway exchangers are set into boundary clocks; the sub-station exchangers and the access layer exchangers are set into transparent clocks; and power distribution terminal devices are set into common clocks. The intelligent power distribution network IEEE1588 timing synchronization system adopts a simple technology, has high time accuracy, has low dependence on a GPS (Global Positioning System), not only is cost-saving, but also has a good expansion degree, has a wide region coverage range, is well suitable for the access-layer type direct connection access rings and can meet the requirement on time synchronization of an intelligent power distribution network.
Description
Technical field
Synchro system when the present invention 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 reaches 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 intelligent distribution network safety analysis and monitoring platform construction, intelligent distribution network wide area protection and the technology such as incident management, the seamless self-healing of intelligent distribution network must allow the correcting delay precision of power distribution network reach Microsecond grade, so there is important practical significance to the research of intelligent distribution network exact time synchronization System Construction.
The time synchronized research of current power system is based on the automation of transformation substations, and the main technology adopted has: during GPS couple, pulse per second (PPS) pair time, IRIG-B code, SNTP SNTP, accurate time synchronization protocol PTP etc.Wherein GPS synchronization accuracy is high, but cost intensive 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 special circuit when needing extra pair, cannot be applied in the larger distributed system of this span length of power distribution network; During synchronous pair of SNTP network message, precision can only reach ms level.IEEE1588 is again the accurate time synchronization protocol PTP of distributed AC servo system and measuring system, it carrys out by wrapping during school and beating timestamp at bottom the time precision that synchronizing network reaches submicrosecond level in ethernet networks, this agreement can multiplexing ethernet communication network, low to resource occupation, without the need to laying additional wires, system Construction cost can be reduced.The application study of current IEEE1588 in electric power system concentrates on automation of transformation substations field mostly, and the application in power distribution network is in the starting stage.And the switch product of existing a large amount of 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 the reliable and stable communication quality such as cost, low error rate, two-forty, good confidentiality of its Large Copacity bandwidth, strong anti-interference ability, relative moderate.Along with rolling up of IP operation, fiber optic Ethernet technology becomes one preferred technique gradually in distribution network communication system backbone layer and Access Layer.Build power distribution automation backbone network with gigabit ethernet ring network, become the typical scenario of distribution network automated communication system construction with the scheme of 100,000,000 Industrial Ethernet looped networks structure power distribution automation Access Networks.The present invention, with regard to based on this typical scenario, studies a kind of system when adopting the IEEE1588 multiplexing school based on fiber optic Ethernet technology distribution network communication system.
Summary of the invention
According to above deficiency of the prior art, the problem to be solved in the present invention 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 region wide, especially adapt to that Access Layer is direct-connected access ring structure, synchro system and method when can meet the intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet that intelligent distribution network time synchronized requires.
The technical solution adopted for the present invention to solve the technical problems is:
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 a main website and closes mouth switch and multiple 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 multiple access-layer switch, first closes mouth switch and second closes mouth switch and is connected to substation switch two rear flank by 100,000,000 optical fiber interfaces and is connected with access-layer switch formation loop configuration again, main website closes mouth switch, substation switch, first closes mouth switch, second closes mouth switch is all connected Distributing Terminal Assembly with access-layer switch, main website closes mouth switch, 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 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 and is terminated by this message, and then main website closes mouth switch according to received information updating local clock;
2) main website closes mouth switch using the local clock after renewal as master clock, by master clock port message information sent to and be connected to other substation switch on backbone layer and close with main website the Distributing Terminal Assembly that mouth switch is connected, substation switch is all set to transparent clock, after receiving message information, upgrade the clock of self, message information is sent to the Distributing Terminal Assembly be connected with substation switch simultaneously;
3) main website closes mouth switch while message information is communicated to substation switch, when main website closes the school of mouth switch, clock sends to first in Access Layer to close mouth switch through substation switch, if loop resistance breaks between two access-layer switch appearing at and be connected, when then main website closes the school of mouth switch, clock is sent to the first pass mouth switch and second simultaneously and closes mouth switch, first pass mouth switch and second closes mouth switch and is all set to boundary clock, first pass mouth switch and second closes after mouth switch receives message information and upgrades local clock respectively, send to coupled access-layer switch using the local clock after renewal as master clock and close mouth switch with first, the Distributing Terminal Assembly that second pass mouth switch is connected with access-layer switch is calibrated, if occur that loop resistance breaks between the second pass mouth switch and substation switch, when then main website closes the school of mouth switch, clock is perforated through substation switch and is sent to first of Access Layer and closes mouth switch, after first pass mouth switch deadline is synchronous, itself is as master clock, sent to by message information other access-layer switch connected, second to close mouth switch and close mouth switch and second with access-layer switch, first and close the Distributing Terminal Assembly that mouth switch is connected, access-layer switch is all set to transparent clock.
Precision clock source unified school at present, backbone layer communication looped network covers distribution main website (control centre of districts and cities) and distribution substation (each transformer station), Access Layer looped network closes mouth switch i.e. the first pass mouth switch by this layer two and the second pass mouth switch directly accesses the substation switch of local communication convergent point backbone layer net from both sides, two close mouth switch and form a complete access ring by the substation switch that other all access-layer switch of connection adds backbone layer, cover each switching station of communication sink accumulation, ring main unit, distribution substation, on-pole switch, finally define 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 multiple Access Layer.In the large ring of backbone layer, select the telephone net node being positioned at main website to be defined as the pass mouth switch of this layer, namely 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 second and close mouth switch (each direct-connected access ring has two to close mouth switch), clock type is chosen as boundary clock BC, and other access-layer switch nodal clock type selecting are transparent clock TC (P2P pattern).The border of subdomain when boundary clock BC node is segmentation PTP school, it can be formed clear in structure, many levels clearly demarcated, relatively independent, pair time process easy PTP subdomain, by last layer be lower one deck come the school of one-level one-level time, final tree system when forming a clock school.The Sync message transmission cycle of each PTP subdomain is generally 2 seconds, and this clocking error local in two seconds can accumulate, gradually until upgrade next time.And lower one deck can add the error of last layer accumulation in 2 seconds in the error of accumulation in local 2 seconds, more multiple error accumulation must be more for level.Close the critical point that mouth switch is equivalent to a clock information stream, all guard by closing mouth switch in the junction of loop network and the superior and the subordinate's network, be set to boundary clock BC, when making the school of this layer with its levels, system separates, form relatively independent PTP subdomain, the communication network of each level is as overall during a large school, wrap when being gone on the air sent school by the critical point convertor boundary clock BC of this layer, during all in this layer schools, information can be sent on this layer of all timing node by the error free accumulation of transparent clock TC.Be the flowing of boundary clock BC information when can also block different layers inter-stage school by critical point switch configuration, alleviate the communications burden of circuit and equipment, strengthen the stability of timing system.By this method divided clock school time domain, the terminal equipment that during school, information is delivered to its 10KV distribution Access Layer at district level backbone layer only needs through two-layer PTP school time domain.So both having ensure that controls in minimum zone by time correction error, and can form again a scale can the wide area multilayer of arbitrary extension network when unifying school.
Preferred further, the main website of backbone layer closes on mouth switch and arranges GPS device, substation switch is arranged Big Dipper device.When main website close mouth switch cannot normally receive higher level net the message information passing precision clock device time, can close according to main website the GPS device that mouth switch is arranged to be calibrated, each website is not needed to be equipped with GPS device, only need to arrange on the pass mouth switch of every layer, not only can ensure the stability of timing system, the cost of timing system can also be reduced; Net the message information passing precision clock device higher level normally cannot be received; when the GPS device of main website pass mouth switch also breaks down; wrap protection can be passed through; form new circuit; be calibrated by the Big Dipper device that substation switch is arranged; not all substation switch is all provided with Big Dipper device, and we can optionally be arranged as required, reduces the cost of timing system.
Preferred further, first of Access Layer closes on mouth switch and arranges the first local clock, and the second pass mouth switch arranges the second local clock.When the message information of higher level's precision clock device normally cannot be received, close by first the local clock that mouth switch and the second pass mouth switch are arranged and be calibrated.
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 to further 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.Time point-to-point (P2P), path delay shake between neighbouring device all passes through the Timing measurement record of fixed cycle in node, when the timestamp information that master clock sends 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 received according to oneself is only needed from clock, just can accurately calculate with the time error of master clock to adjust oneself, do not need to send Delay-Request again, Delay-Response and so on subsequent packet, be equivalent to master clock unidirectional to information when sending school from clock, no longer use ping-pong procedure.E2E transparent clock is still equivalent to measure the shake of whole path delay with ping-pong procedure, and when network topology change (pretection switch), 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 higher level from high in the end and nets the GPS device on biography precision clock device, main website pass mouth switch and the Big Dipper device on the switch of substation.The clock source priority of Access Layer is followed successively by higher level from high in the end and nets the first local clock passed on precision clock device, the first pass mouth switch, and second closes the second local clock on mouth switch.
The beneficial effect that the present invention has is:
During the described intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet, synchro system is by system layering during rational school, the effect that when reaching school, expansibility of network size degree is high, the timing node type of choose reasonable, when 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 for subsequent use, strengthens the robustness of system, in injection length source, appropriate place, makes backbone layer can save a large amount of GPS correction device.By carrying out prioritization to different clocks source, superior communication node clock signal is one-level, master clock source is secondary, substation clock source is set to three grades, when making system can determine a time source all the time as master clock school by BMC algorithm according to time source quality, select suitable clock source decanting point, reduce district level backbone layer clock source quantity.By arrange Access Layer close mouth switch be BC, if Access Layer time of occurrence isolated island, the unified clock of a time isolated island can be established, reduce as far as possible impact.
The present invention adopts IEEE1588 technology, multiplexing Industrial Ethernet communication system, by system layering during rational school, select suitable clock node type, final formation one covers all distribution automation terminal nodes, higher level or local main website precision clock source are master clock, multiple clock source is for subsequent use, precision clock can be transmitted step by step, network redundancy forms new Clock Tree when switching automatically, precision is better than 1 microsecond, divergence is good, good adaptation Access Layer is the wide area multilayer of direct-connected access ring network when unifying 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 invention;
Fig. 2 is that precision clock of the present invention successively transmits schematic diagram;
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described further:
As Fig. 1, shown in Fig. 2, synchro system during intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet of the present invention, comprise backbone layer and Access Layer, it is characterized in that: backbone layer comprises a main website and closes mouth switch and multiple 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 multiple access-layer switch, first closes mouth switch and second closes mouth switch and is connected to substation switch two rear flank by 100,000,000 optical fiber interfaces and is connected with access-layer switch formation loop configuration again, main website closes mouth switch, substation switch, first closes mouth switch, second closes mouth switch is all connected Distributing Terminal Assembly with access-layer switch, main website closes mouth switch, 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 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 and is terminated by this message, and then main website closes mouth switch according to received information updating local clock;
2) main website closes mouth switch using the local clock after renewal as master clock, by master clock port message information sent to and be connected to other substation switch on backbone layer and close with main website the Distributing Terminal Assembly that mouth switch is connected, substation switch is all set to transparent clock, after receiving message information, upgrade the clock of self, message information is sent to the Distributing Terminal Assembly be connected with substation switch simultaneously;
3) main website closes mouth switch while message information is communicated to substation switch, when main website closes the school of mouth switch, clock sends to first in Access Layer to close mouth switch through substation switch, if loop resistance breaks between two access-layer switch appearing at and be connected, when then main website closes the school of mouth switch, clock is sent to the first pass mouth switch and second simultaneously and closes mouth switch, first pass mouth switch and second closes mouth switch and is all set to boundary clock, first pass mouth switch and second closes after mouth switch receives message information and upgrades local clock respectively, send to coupled access-layer switch using the local clock after renewal as master clock and close mouth switch with first, the Distributing Terminal Assembly that second pass mouth switch is connected with access-layer switch is calibrated, if occur that loop resistance breaks between the second pass mouth switch and substation switch, when then main website closes the school of mouth switch, clock is perforated through substation switch and is sent to first of Access Layer and closes mouth switch, after first pass mouth switch deadline is synchronous, itself is as master clock, sent to by message information other access-layer switch connected, second to close mouth switch and close mouth switch and second with access-layer switch, first and close 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 and arranges GPS device, substation switch is arranged Big Dipper device, and first of Access Layer closes on mouth switch and arranges the first local clock, and the second pass mouth switch arranges 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 higher level from high in the end and nets the GPS device on biography precision clock device, main website pass mouth switch and the Big Dipper device on the switch of substation, the clock source priority of Access Layer is followed successively by higher level from high in the end and nets the first local clock passed 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 (control centre of districts and cities) and distribution substation (each transformer station), and the connection between the switch of main website and transformer station's duty all adopts IEEE1588 agreement.As shown in Figure 1, as backbone layer, backbone network design employing three layers of industrial ethernet switch, form loop network by kilomega optic fiber interface, enable dynamic routing protocol, realize data route and dynamically forward in loop network.Access Layer is mainly used in the access of 10KV power distribution network terminal at different levels, covers each switching station, ring main unit, distribution substation, on-pole switch etc.Access Layer is made up of two layers of industrial ethernet switch in each communication sink accumulation institute overlay area, different corresponding subring is divided according to the regional extent covered, 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 close mouth switchs and add backbone layer switch by other this layer switch all of connection, form a complete access ring.
In the large ring of backbone layer, select the telephone net node being positioned at main website to be defined as the pass mouth switch of this layer, 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 when passing local clock school to this node of precision clock or GPS precision clock source signal, and main website backbone layer switch as master clock, sends to connection other substation switch over the backbone message using local clock.Because substation switch configuration is transparent clock TC, the clock of self does not upgrade, when being equivalent to the school that now master clock port sends, message arrives on the pass mouth switch of next transparent clock TC or coupled Access Layer, when can complete once school to the pass mouth switch of all Access Layers at the end of this layer time-revise cycle through transparent clock TC.After the pass mouth switch of all Access Layers completes time synchronized, when itself being re-used as master clock high-ranking officers, message sends to other switch or the distribution terminal equipment of itself of connection, and during this school, message arrives on next transparent clock TC or coupled Distributing Terminal Assembly through the transparent clock TC be connected.The segmentation of clock school time domain and Joint Enterprise as shown in Figure 2, to be split according to this and configuration mode can form network when a wide area multilayer unifies school.
Backbone layer clock source injects the realization with redundancy: during backbone layer school, the master clock of network is the communication interface that main website pass mouth switch is connected higher level's backbone network, receive higher level by this mouth and net biography precision clock, to the synchronize local clocks of this switch, and then to when during connection this layer of school, all BC of network broadcast school.Standby clock source is the synchronous timing device of gps satellite be connected on main website pass mouth switch and the synchronous timing device of big-dipper satellite be connected on other substation switch of backbone layer.Clock source priority sets gradually respectively and passes precision clock for: higher level nets, close the GPS device on mouth switch, the Big Dipper device on the backbone switch of substation and local clock.When master clock lost efficacy, node, by BMC algorithm, automatically upgraded and was switched to secondary standby clock source, and made it become new master clock, thus set when forming new school.Key loop makes it disconnect at diagram logical connection place by network management system, system during a formation tree-shaped school.
Access Layer clock source injects and the realization of redundancy: during the direct-connected access ring of communication network, be boundary clock BC two critical point switch configurations, wherein the first priority of closing mouth switch is higher than the second pass mouth switch, and the formation of such time synchronized tree can be more convenient, avoids conflicting during school.During normal condition, by higher level net pass precision clock give wherein first close mouth switch school time, then by it to all Distributing Terminal Assembly OC and second close mouth switch school time.During the protection of circuit initial ring, by higher level net pass precision clock respectively to the mouth switch school, pass on both sides time, then by they give be connected PTP subdomain school separately time.During time isolated island, by pass mouth switch as master clock source to all Distributing Terminal Assembly OC and another mouth switch school, pass time.Simultaneously when time of origin isolated island and protecting circuit loop, be equivalent to define two time isolated islands, each by its pass mouth switch as master clock source school time.
The present invention adopts layering principle, each communication loop (comprising the large ring of backbone layer and the little ring of Access Layer) is seen and makes a clock school time domain, in the time domain of each clock school, a small amount of telephone net node clock type is selected to be set to BC, as the master clock in the time domain of this clock school; Other Node configurations are TC.When can reach 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 wide, the good adaptation Access Layer in region and be direct-connected access ring, the requirement of intelligent distribution network time synchronized can be met.
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 a main website and closes mouth switch and multiple 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 multiple access-layer switch, first closes mouth switch and second closes mouth switch and is connected to substation switch two rear flank by 100,000,000 optical fiber interfaces and is connected with access-layer switch formation loop configuration again, main website closes mouth switch, substation switch, first closes mouth switch, second closes mouth switch is all connected Distributing Terminal Assembly with access-layer switch, main website closes mouth switch, 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 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 and is terminated by this message, and then main website closes mouth switch according to received information updating local clock;
2) main website closes mouth switch using the local clock after renewal as master clock, by master clock port message information sent to and be connected to other substation switch on backbone layer and close with main website the Distributing Terminal Assembly that mouth switch is connected, substation switch is all set to transparent clock, after receiving message information, upgrade the clock of self, message information is sent to the Distributing Terminal Assembly be connected with substation switch simultaneously;
3) main website closes mouth switch while message information is communicated to substation switch, when main website closes the school of mouth switch, clock sends to first in Access Layer to close mouth switch through substation switch, if loop resistance breaks between two access-layer switch appearing at and be connected, when then main website closes the school of mouth switch, clock is sent to the first pass mouth switch and second simultaneously and closes mouth switch, first pass mouth switch and second closes mouth switch and is all set to boundary clock, first pass mouth switch and second closes after mouth switch receives message information and upgrades local clock respectively, send to coupled access-layer switch using the local clock after renewal as master clock and close mouth switch with first, the Distributing Terminal Assembly that second pass mouth switch is connected with access-layer switch is calibrated, if occur that loop resistance breaks between the second pass mouth switch and substation switch, when then main website closes the school of mouth switch, clock is perforated through substation switch and is sent to first of Access Layer and closes mouth switch, after first pass mouth switch deadline is synchronous, itself is as master clock, sent to by message information other access-layer switch connected, second to close mouth switch and close mouth switch and second with access-layer switch, first and close the Distributing Terminal Assembly that mouth switch is connected, access-layer switch is all set to transparent clock.
2. synchro system during 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 and arranges GPS device, substation switch is arranged Big Dipper device.
3. synchro system during intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet according to claim 1, it is characterized in that: first of described Access Layer closes on mouth switch and arranges the first local clock, the second pass mouth switch arranges the second local clock.
4. synchro system during 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 the intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet according to claim 1 or 3, is characterized in that: described first closes mouth switch, second closes mouth switch and access-layer switch all adopts two layers of industrial ethernet switch.
6. synchro system during 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 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 be followed successively by from high in the end higher level net pass precision clock device, main website closes the GPS device on mouth switch and the Big Dipper device on the switch of substation.
8. synchro system during the intelligent distribution network IEEE1588 school based on the direct-connected access ring of Industrial Ethernet according to claim 1 or 3, it is characterized in that: the clock source priority of described Access Layer is followed successively by higher level from high in the end and nets the first local clock passed on precision clock device, the first pass mouth switch, and second closes the second local clock on mouth switch.
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CN106961312B (en) * | 2017-05-06 | 2018-08-17 | 西北工业大学 | A kind of structure of network instrument clock synchronization system and method |
CN109218007B (en) * | 2017-07-03 | 2022-11-01 | 中兴通讯股份有限公司 | Path selection method, device and storage medium |
CN111601189B (en) * | 2020-04-30 | 2022-01-25 | 云南电网有限责任公司迪庆供电局 | Accurate time synchronization method and system applied to cable distance measuring device |
CN113411155B (en) * | 2021-06-18 | 2023-03-28 | 广东电网有限责任公司 | Power distribution network clock synchronization system and method based on Ethernet transmission |
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