CN103532230B - Synchro system during intelligent distribution network IEEE1588 school based on the tangent access ring of Industrial Ethernet - Google Patents
Synchro system during intelligent distribution network IEEE1588 school based on the tangent access ring of Industrial Ethernet Download PDFInfo
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
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 tangent access ring of Industrial Ethernet.Comprise backbone layer and Access Layer, backbone layer closes mouth switch connection higher level nets biography precision clock device, backbone layer closes mouth switch and backbone layer switch is connected to form loop configuration by kilomega optic fiber interface, Access Layer comprises an Access Layer be connected with backbone layer switch and closes mouth switch and multiple access-layer switch, Access Layer closes mouth switch and access-layer switch is connected to form loop configuration, backbone layer closes mouth switch, Access Layer critical point switch configuration is boundary clock, backbone layer switch and access-layer switch are set to transparent clock, Distributing Terminal Assembly is set to ordinary clock, the technology of the present invention is simple, time precision is high, little to GPS dependence, cost saving divergence is good, covering region is wide, the requirement of intelligent distribution network time synchronized can be met.
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 tangent 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 tangent access ring structure, synchro system when can meet the intelligent distribution network IEEE1588 school based on the tangent 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 tangent access ring of Industrial Ethernet, comprise backbone layer and Access Layer, backbone layer comprises a backbone layer and closes mouth switch and multiple backbone layer switch, backbone layer closes mouth switch connection higher level nets biography precision clock device, backbone layer closes mouth switch and backbone layer switch is connected to form loop configuration by kilomega optic fiber interface, Access Layer comprises an Access Layer be connected with backbone layer switch and closes mouth switch and multiple access-layer switch, Access Layer closes mouth switch and to be connected with access-layer switch formation loop configuration, access-layer switch connects Distributing Terminal Assembly, backbone layer closes mouth switch, Access Layer critical point switch configuration is boundary clock, backbone layer 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 tangent access ring of Industrial Ethernet, synchronous method step is as follows:
1) backbone layer closes mouth switch and receives the clock source message netting biography precision clock device from higher level, by being boundary clock by backbone layer critical point switch configuration, backbone layer closes after mouth switch receives higher level's time message and is terminated by this message, and then backbone layer closes mouth switch according to received information updating local clock;
2) backbone layer closes mouth switch using the local clock after renewal as master clock, by master clock port, message information is sent to other the backbone layer switch be connected on backbone layer, backbone layer 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 backbone layer switches;
3) backbone layer closes mouth switch while message information is communicated to backbone layer switch, when backbone layer closes the school of mouth switch, clock sends to Access Layer to close mouth switch through backbone layer switch, Access Layer closes after mouth switch receives message information and upgrades local clock, after the Access Layer pass mouth switch deadline is synchronous, message when being re-used as master clock high-ranking officers itself sends to and closes the access-layer switch that mouth switch is connected and the Distributing Terminal Assembly be connected with this access-layer switch with Access Layer, because self clock being set to the access-layer switch of transparent clock does not upgrade, then during school, message information is equivalent to the Distributing Terminal Assembly being forwarded directly to next stage access-layer switch and being connected with this access-layer switch.
Precision clock source unified school at present, Backbone 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 by this layer and accesses on the switch of local communication convergent point backbone network, connect other all access-layer switch again and form a complete little ring, tangent with key loop, 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 tangent structure of the little ring of multiple Access Layer.
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, select a small amount of telephone net node clock type to be set to boundary clock BC, as the master clock in the time domain of this clock school, other Node configurations are transparent clock TC, Distributing Terminal Assembly is set to ordinary clock OC, and 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.
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, the switch be connected with backbone layer switch is defined as and closes mouth switch (each tangent access ring has to close mouth switch) as boundary clock BC, and other telephone net nodes are as 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, backbone layer closes on mouth switch and arranges GPS device, backbone layer switch is arranged Big Dipper device.When backbone layer close mouth switch cannot normally receive higher level net the message information passing precision clock device time, can close according to backbone layer 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, the GPS device of backbone layer pass mouth switch can be calibrated by the Big Dipper device that backbone layer switch is arranged when also breaking down, not all backbone layer switch is all provided with Big Dipper device, we can optionally be arranged as required, reduce the cost of timing system.When normally receiving the message information of higher level's precision clock device, the local clock being closed mouth switch by Access Layer is calibrated.
Preferred further, backbone layer closes mouth switch and backbone layer switch all adopts three layers of industrial ethernet switch.Access Layer closes mouth switch and access-layer switch all adopts two layers of industrial ethernet switch.
Preferred further, backbone layer 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 backbone layer 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 (end-to-end) transparent clock is still equivalent to measure the shake of whole path delay with ping-pong procedure; and when network topology change (pretection switch); may be there is of short duration relatively large deviation 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, backbone layer pass mouth switch and the Big Dipper device on backbone layer switch.
The beneficial effect that the present invention has is:
During the described intelligent distribution network IEEE1588 school based on the tangent 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 tangent access ring structure.By using multiple clock source for subsequent use, the robustness of enhancing system, in injection length source, appropriate place, make 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, and exchange clock source, main website critical point 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.By selecting suitable clock source decanting point, reduce district level backbone layer clock source quantity, arranging Access Layer pass mouth switch is boundary clock BC, if Access Layer time of occurrence isolated island, can establish the unified clock of a time isolated island, reduce impact as far as possible.
Construction object of 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 tangent access ring structure 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 tangent access ring of Industrial Ethernet of the present invention, comprise backbone layer and Access Layer, it is characterized in that: backbone layer comprises a backbone layer and closes mouth switch and multiple backbone layer switch, backbone layer closes mouth switch connection higher level nets biography precision clock device, backbone layer closes mouth switch and backbone layer switch is connected to form loop configuration by kilomega optic fiber interface, Access Layer comprises an Access Layer be connected with backbone layer switch and closes mouth switch and multiple access-layer switch, Access Layer closes mouth switch and to be connected with access-layer switch formation loop configuration, access-layer switch connects Distributing Terminal Assembly, backbone layer closes mouth switch, Access Layer critical point switch configuration is boundary clock, backbone layer 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 tangent access ring of Industrial Ethernet, synchronous method step is as follows:
1) backbone layer closes mouth switch and receives the clock source message netting biography precision clock device from higher level, by being boundary clock by backbone layer critical point switch configuration, backbone layer closes after mouth switch receives higher level's time message and is terminated by this message, and then backbone layer closes mouth switch according to received information updating local clock;
2) backbone layer closes mouth switch using the local clock after renewal as master clock, by master clock port, message information is sent to other the backbone layer switch be connected on backbone layer, backbone layer 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 backbone layer switches;
3) backbone layer closes mouth switch while message information is communicated to backbone layer switch, when backbone layer closes the school of mouth switch, clock sends to Access Layer to close mouth switch through backbone layer switch, Access Layer closes after mouth switch receives message information and upgrades local clock, after the Access Layer pass mouth switch deadline is synchronous, message when being re-used as master clock high-ranking officers itself sends to and closes the access-layer switch that mouth switch is connected and the Distributing Terminal Assembly be connected with this access-layer switch with Access Layer, because self clock being set to the access-layer switch of transparent clock does not upgrade, then during school, message information is equivalent to the Distributing Terminal Assembly being forwarded directly to next stage access-layer switch and being connected with this access-layer switch.
Wherein, backbone layer closes on mouth switch and arranges GPS device, backbone layer switch is arranged Big Dipper device, backbone layer closes mouth switch and backbone layer switch all adopts three layers of industrial ethernet switch, and Access Layer closes mouth switch and access-layer switch all adopts two layers of industrial ethernet switch.Backbone layer 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, backbone layer pass mouth switch and the Big Dipper device on backbone layer 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).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 tangent access ring structure; by 100,000,000 light mouth composition looped networks between two layers of industrial ethernet switch in this ring; access on the three-tier switch of local communication convergent point backbone network by a Layer 2 switch (be defined as and close mouth switch); this structure is generally applicable to Layer 2 switch when adopting privately owned ring protection protocol, within the protection switch time of its access ring can reach 20ms.
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 switch as master clock, sends to connection other switches over the backbone message using local clock.Because they are arranged in order to 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 access-layer 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 backbone layer 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 boundary clock BC of network broadcast school.Standby clock source is the synchronous timing device of gps satellite be connected on this pass mouth switch and the synchronous timing device of big-dipper satellite be connected on other substation backbone layer switch of this layer.Clock source priority sets gradually respectively and passes the GPS device on precision clock, pass mouth switch, the Big Dipper device on the backbone switch of substation and local clock for higher level nets.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 Access Layer school, the master clock of network closes the communication interface that mouth switch is connected higher level's backbone network inside substation, first receive higher level's backbone network network diagram by this mouth and pass precision clock, upgrade the local clock of switch, and then during to all terminal broadcast schools of network when connecting this layer of school.When subnet does not receive higher level's backbone network network diagram biography precision clock, a time isolated island can be formed, because check on, mouth switch is arranged in order to boundary clock BC, now by BMC algorithm, close the master clock that mouth switch self becomes this time isolated island, make the clock of all nodes of whole subnet keep relative synchronization.Other mechanism are similar with backbone layer.
The present invention uses IEEE1588 technology, by multiplexing Industrial Ethernet communication network, system layering when using rational school, select suitable clock node type, precision clock source is successively transmitted on a large ring of backbone layer and the tangent network of the little ring of multiple Access Layer, cover all distribution automation terminal nodes, good adaptation Access Layer is tangent access ring structure, final formation precision is better than 1 microsecond, only need a small amount of accurately clock equipment, can automatically select to switch multiple redundancy clock source, synchro system when not only cost saving divergence but also good wide area multilayer unify distribution network school.
Claims (6)
1. synchro system during an intelligent distribution network IEEE1588 school based on the tangent access ring of Industrial Ethernet, comprise backbone layer and Access Layer, it is characterized in that: backbone layer comprises a backbone layer and closes mouth switch and multiple backbone layer switch, backbone layer closes mouth switch connection higher level nets biography precision clock device, backbone layer closes mouth switch and backbone layer switch is connected to form loop configuration by kilomega optic fiber interface, Access Layer comprises an Access Layer be connected with backbone layer switch and closes mouth switch and multiple access-layer switch, Access Layer closes mouth switch and to be connected with access-layer switch formation loop configuration, access-layer switch connects Distributing Terminal Assembly, backbone layer closes mouth switch, Access Layer critical point switch configuration is boundary clock, backbone layer 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 tangent access ring of Industrial Ethernet, synchronous method step is as follows:
1) backbone layer closes mouth switch and receives the clock source message netting biography precision clock device from higher level, by being boundary clock by backbone layer critical point switch configuration, backbone layer closes after mouth switch receives higher level's time message and is terminated by this message, and then backbone layer closes mouth switch according to received information updating local clock;
2) backbone layer closes mouth switch using the local clock after renewal as master clock, by master clock port, message information is sent to other the backbone layer switch be connected on backbone layer, backbone layer 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 backbone layer switches;
3) backbone layer closes mouth switch while message information is communicated to backbone layer switch, when backbone layer closes the school of mouth switch, clock sends to Access Layer to close mouth switch through backbone layer switch, Access Layer closes after mouth switch receives message information and upgrades local clock, after the Access Layer pass mouth switch deadline is synchronous, message when being re-used as master clock high-ranking officers itself sends to and closes the access-layer switch that mouth switch is connected and the Distributing Terminal Assembly be connected with this access-layer switch with Access Layer, because self clock being set to the access-layer switch of transparent clock does not upgrade, then during school, message information is equivalent to the Distributing Terminal Assembly being forwarded directly to next stage access-layer switch and being connected with this access-layer switch.
2. synchro system during intelligent distribution network IEEE1588 school based on the tangent access ring of Industrial Ethernet according to claim 1, is characterized in that: described backbone layer closes on mouth switch and arranges GPS device, backbone layer switch is arranged Big Dipper device.
3. synchro system during intelligent distribution network IEEE1588 school based on the tangent access ring of Industrial Ethernet according to claim 1 and 2, is characterized in that: described backbone layer closes mouth switch and backbone layer switch all adopts three layers of industrial ethernet switch.
4. synchro system during intelligent distribution network IEEE1588 school based on the tangent access ring of Industrial Ethernet according to claim 1, is characterized in that: described Access Layer closes mouth switch and access-layer switch all adopts two layers of industrial ethernet switch.
5. synchro system during intelligent distribution network IEEE1588 school based on the tangent access ring of Industrial Ethernet according to claim 1, is characterized in that: described backbone layer switch and access-layer switch are set to point-to-point transparent transmission mode.
6. synchro system during intelligent distribution network IEEE1588 school based on the tangent access ring of Industrial Ethernet according to claim 2, is characterized in that: the clock source priority of described backbone layer be followed successively by from high to low higher level net pass precision clock device, backbone layer closes the GPS device on mouth switch and the Big Dipper device on backbone layer switch.
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| CN105227491B (en) * | 2015-10-21 | 2019-01-08 | 国家电网公司 | A kind of resource regulating method in electricity consumption wireless access network |
| CN105785119B (en) * | 2016-04-26 | 2018-10-12 | 国网冀北电力有限公司电力科学研究院 | The intelligent electric energy meter and method of automatic correcting time are carried out using big-dipper satellite time dissemination system |
| CN110195614A (en) * | 2019-06-06 | 2019-09-03 | 平安开诚智能安全装备有限责任公司 | A kind of coal mine safety monitoring alarm control system |
| 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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