CN104218677A - Method for synchronizing clocks of power distribution master stations and power distribution terminals - Google Patents
Method for synchronizing clocks of power distribution master stations and power distribution terminals Download PDFInfo
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- CN104218677A CN104218677A CN201410457999.2A CN201410457999A CN104218677A CN 104218677 A CN104218677 A CN 104218677A CN 201410457999 A CN201410457999 A CN 201410457999A CN 104218677 A CN104218677 A CN 104218677A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The invention discloses a method for synchronizing clocks of power distribution master stations and power distribution terminals. The method is characterized in that a procedure for selecting clock synchronizing moments is additionally implemented between a procedure for acquiring delays and a procedure for transmitting the delays on the basis of three original procedures for synchronizing the clocks of the power distribution master stations and the power distribution terminals, delay errors E<delta t<i>> of three continuous channel delays delta t<1>, delta t<2> and delta t<3> are used as selection bases for judging the clock synchronizing moments in the procedure for selecting the clock synchronizing moments, and accordingly a channel delay issued in the follow-up procedure for transmitting the delays is equal to an average value of the three channel delays acquired in the procedure for acquiring the delays. The method has the advantages that a clock synchronizing protocol implemented in the method is based on existing clock synchronizing protocol SNTP (simple network time protocol), accordingly, the clock synchronizing moments and the channel delays can be accurately selected, and particularly, the purpose of acquiring high clock synchronizing error precision can be achieved for wireless communication networks with instable channel delays without changing the existing automatic power distribution master stations, hardware structures of the terminals and the clock synchronizing protocol SNTP.
Description
Technical field
The invention belongs to electrical power distribution automation system field, particularly relate to a kind of distribution main website (i.e. power distribution automation main station system) and distribution terminal (i.e. distribution power automation terminal) clock synchronizing method.
Background technology
Electric power system belongs to the system with time correlation, and the accuracy of power distribution network accident analysis depends on the precision of the clock of event sequence.But the electrical power distribution automatization system run now, when carrying out clock synchronous to distribution terminal equipment, does not often consider the communication channel delay of communication network, when when directly to send pair, instruction is carried out pair, therefore large to time error.Especially adopting cordless communication network communication and when being in network busy hour state, communication channel delay reaches more than 10s sometimes, in such cases, will be larger to time error.For reducing time error, when electrical power distribution automatization system generally adopts SNTP (Simple Network Time Protocol-SNTP) agreement pair, within 500ms is narrowed down to time error, but when the time delay of communication network is unstable (especially cordless communication network), pair time precision can not get ensureing.How under various network communication status, improve mechanism when existing pair, when to ensure pair, precision just seems particularly important.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of distribution main website and distribution terminal clock synchronizing method, and to realize under the condition not changing existing clock synchronization protocol (SNTP agreement), clock synchronous error precision is higher.
For solving the problems of the technologies described above, the present invention is by the following technical solutions: distribution main website and distribution terminal clock synchronizing method, comprise delay acquisition process, time delay transmittance process, time synchronization process, between delay acquisition process and time delay transmittance process, increase the selection course in clock synchronous moment.
The communication channel delay issued in time delay transmittance process is the mean value of the 3 subchannel time delays that delay acquisition process obtains.
In the selection course in clock synchronous moment, by the communication channel delay △ t of continuous three times
1, △ t
2, △ t
3delay time error
as the selection gist judging the clock synchronous moment, if
wherein i=1,2,3, average delay
then communication channel delay is stablized, and distribution main website and distribution terminal Clock Synchronization Procedure continue; If
then communication channel delay is unstable, distribution main website and distribution terminal Clock Synchronization Procedure can not proceed, continue to repeat delay acquisition process until delay time error is less than or equal to 5%, or select other times section to re-start the clock synchronous of distribution main website and distribution terminal.
For existing distribution main website and distribution terminal Clock Synchronization Procedure Problems existing, according to actual conditions and associated specifications, we have established a kind of distribution main website and distribution terminal clock synchronizing method, namely on the basis of three processes of original distribution main website and distribution terminal clock synchronous, the selection course in clock synchronous moment is increased between delay acquisition process and time delay transmittance process, in this process, by the communication channel delay △ t of continuous three times
1, △ t
2, △ t
3delay time error
as the selection gist judging the clock synchronous moment, the communication channel delay issued in follow-up time delay transmittance process is made to be the mean value of the 3 subchannel time delays that delay acquisition process obtains.Clock synchronization protocol in the present invention is based on agreement during existing SNTP couple, pair time moment and communication channel delay on done and more accurately selected, especially to the cordless communication network of communication channel delay instability, when not changing existing power distribution automation main website, terminal hardware structure, SNTP couple agreement condition under, the object that clock synchronous error precision is higher can be realized.
Accompanying drawing explanation
Fig. 1 is power distribution automation main station system and distribution power automation terminal system connection layout.
The schematic diagram of delay acquisition process in Tu2Shi distribution main website and distribution terminal clock synchronous.
The schematic diagram of time delay transmittance process in Tu3Shi distribution main website and distribution terminal clock synchronous.
The schematic diagram of Clock Synchronization Procedure in Tu4Shi distribution main website and distribution terminal clock synchronous.
In figure: TI-classification logotype, FC-function code, COT-transmits reason, PRM-information source information position.
Embodiment
Fig. 1 shows the annexation of power distribution automation main station system and distribution power automation terminal system.Distribution main website of the present invention and distribution terminal clock synchronizing method are based on agreement during SNTP couple, by the delivery time of choose reasonable clock synchronous instruction with issue rational communication channel delay, reach the object of precision when to improve pair.
The Clock Synchronization Procedure of distribution main website of the present invention and distribution terminal is described with the balanced type of DL/T634.5101-2002 agreement below, specific as follows:
Clock synchronizing method of the present invention is made up of following four-stage: delay acquisition process, the selection course in clock synchronous moment, time delay transmittance process, time synchronization process.
(1) delay acquisition process (Fig. 2)
This process is for obtaining the communication channel delay between distribution main website to distribution terminal, detailed process is: distribution main website is using " delay acquisition instruction " message as the startup of this process, and will send this message primary millisecond moment and insert in message as temporal information, suppose that this moment is t
a; The moment of distribution terminal receives " delay acquisition order " message, the distribution terminal time is with t
amoment starts timing; Through t
bprocessing time after, distribution terminal is immediately with " delay acquisition confirmation " message response, and insert in message to send this message primary millisecond moment as temporal information, t made by this moment meter
c, then t
c=t
a+ t
b; The moment of distribution main website receives " delay acquisition confirmation " message, record distribution main website moment t this moment
d, then the communication channel delay between distribution main station system to distribution terminal
(2) selection course in clock synchronous moment
Repeat " delay acquisition process " again 2 times, obtain transmission delay △ t respectively
2, △ t
3, then average delay is
if △ is t
1, △ t
2, △ t
3be the absolute value of the difference of △ t with average delay be delay time error divided by the value of △ t, namely
wherein i=1,2,3, then communication channel delay is highly stable, pair time flow process proceed; If
then communication channel delay is unstable, when to be not suitable for pair, repeats delay acquisition process, until delay time error is less than or equal to 5%.
(3) time delay transmittance process (Fig. 3)
This process is used for distribution main website and the average channel transmission delay of calculating is passed to distribution terminal, detailed process is: the average channel transmission delay of calculating is transferred to distribution terminal with the data format of data burst by distribution main website, and distribution terminal link layer confirms.This time value and frame are transmitted sum consuming time as clock synchronous time adjustment value by distribution terminal, and the frame transmission frame length that equals consuming time is divided by transmission rate.
(4) Clock Synchronization Procedure (Fig. 4)
This process is used for main station system and distribution terminal carries out time synchronized, and detailed process is: " clock synchronous " instruction message comprises the present clock T sent from distribution main website, and this clock T is the 1st moment sent of clock synchronous message.Distribution terminal receives " clock synchronous " instruction message that main website sends and after analytic message, the clock T in message is added correction time, value upgraded the current time of distribution terminal as lock in time; Meanwhile, before not pair time, record the current time time of distribution terminal, this moment deducts the temporal information of time adjustment value confirmation message responsively.
Claims (3)
1. distribution main website and a distribution terminal clock synchronizing method, comprises delay acquisition process, time delay transmittance process, time synchronization process, it is characterized in that: the selection course increasing the clock synchronous moment between delay acquisition process and time delay transmittance process.
2. distribution main website according to claim 1 and distribution terminal clock synchronizing method, is characterized in that: the communication channel delay issued in described time delay transmittance process is the mean value of the 3 subchannel time delays that delay acquisition process obtains.
3. distribution main website according to claim 2 and distribution terminal clock synchronizing method, is characterized in that: in the selection course in described clock synchronous moment, by the communication channel delay △ t of continuous three times
1, △ t
2, △ t
3delay time error
as the selection gist judging the clock synchronous moment,
wherein i=1,2,3, average delay
then communication channel delay is stablized, and distribution main website and distribution terminal Clock Synchronization Procedure continue; If
then communication channel delay is unstable, distribution main website and distribution terminal Clock Synchronization Procedure can not proceed, continue to repeat delay acquisition process until delay time error is less than or equal to 5%, or select other times section to re-start the clock synchronous of distribution main website and distribution terminal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410457999.2A CN104218677A (en) | 2014-09-10 | 2014-09-10 | Method for synchronizing clocks of power distribution master stations and power distribution terminals |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410457999.2A CN104218677A (en) | 2014-09-10 | 2014-09-10 | Method for synchronizing clocks of power distribution master stations and power distribution terminals |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106455039A (en) * | 2016-11-08 | 2017-02-22 | 石家庄科林电气股份有限公司 | Communication terminal, network and method for improving time synchronization accuracy in power distribution network |
| CN111244945A (en) * | 2020-01-20 | 2020-06-05 | 天津市中力神盾电子科技有限公司 | Power distribution parameter consistency detection method and system |
| US10813070B2 (en) | 2016-12-20 | 2020-10-20 | Huawei Technologies Co., Ltd. | Method and apparatus for determining clock time deviation between terminal and base station |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1311611A (en) * | 2000-03-01 | 2001-09-05 | 朗迅科技公司 | Synchronous filtering funcltion for base station transceiver to radio network controller |
| CN1503481A (en) * | 2002-11-21 | 2004-06-09 | 华为技术有限公司 | Method for testing clock reverse delay system of transmission equipment |
| KR20120137577A (en) * | 2011-05-03 | 2012-12-24 | (주) 솔루윈스 | System and method for distrubuting power using home network |
-
2014
- 2014-09-10 CN CN201410457999.2A patent/CN104218677A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1311611A (en) * | 2000-03-01 | 2001-09-05 | 朗迅科技公司 | Synchronous filtering funcltion for base station transceiver to radio network controller |
| CN1503481A (en) * | 2002-11-21 | 2004-06-09 | 华为技术有限公司 | Method for testing clock reverse delay system of transmission equipment |
| KR20120137577A (en) * | 2011-05-03 | 2012-12-24 | (주) 솔루윈스 | System and method for distrubuting power using home network |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106455039A (en) * | 2016-11-08 | 2017-02-22 | 石家庄科林电气股份有限公司 | Communication terminal, network and method for improving time synchronization accuracy in power distribution network |
| CN106455039B (en) * | 2016-11-08 | 2019-08-23 | 石家庄科林电气股份有限公司 | Communication terminal, network and the method for clock synchronization precision are improved in a kind of power distribution network |
| US10813070B2 (en) | 2016-12-20 | 2020-10-20 | Huawei Technologies Co., Ltd. | Method and apparatus for determining clock time deviation between terminal and base station |
| CN111244945A (en) * | 2020-01-20 | 2020-06-05 | 天津市中力神盾电子科技有限公司 | Power distribution parameter consistency detection method and system |
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Application publication date: 20141217 |