CN107359978A - A kind of HSR/PRP network samples synchronous method based on data forwarding Time delay measurement - Google Patents
A kind of HSR/PRP network samples synchronous method based on data forwarding Time delay measurement Download PDFInfo
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- H—ELECTRICITY
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- H04L7/00—Arrangements for synchronising receiver with transmitter
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Abstract
The invention discloses a kind of HSR/PRP network samples synchronous method based on data forwarding Time delay measurement：By beating timestamp to SV messages in the basic communication unit RedBox of HSR/PRP networks input, output port; SV messages the measurement of transmission delay and are added up and write in message time domain on RedBox; realize that the SV messages accumulation transmission time of equipment between HSR rings, HSR rings and PRP networks accurately measures; SV messages reception device (such as protection, observing and controlling device) is on the basis of local clock; combining unit SV message delivery times are calculated according to the value received in message time domain, realize sampling data synchronization.Using this synchronous method, the problem of HSR/PRP network samples synchronously rely on common clock signal can be efficiently solved.
Description
Technical field
The present invention relates to transforming plant protecting control technology field, more particularly, to using HSR/PRP technology substation secondaries
Device network sampling synchronization method and the device using this method.
Background technology
To improve data transmission credibility, current intelligent substation uses redundant network pattern, hot standby in double-network redundant
In the case of, single net network storm can cause device cpu load to become weight and can not normally handle proper network message, lead to not
Realize the purpose of double net stand-by heats.Parallel Redundancy Protocol (PRP) and High Availabitity seamless ring fidonetFido (HSR) are to realize network redundancy
Two kinds of novel protocols, PRP technologies are using completely self-contained double set real-time performance message Hot Spares, as long as there is a set of network to work
Normally, you can ensure that the IED equipment being linked on network is working properly, PRP technologies reduce device CPU usage, and CPU is only needed
Single network data is handled, double network data filterings are realized by hardware；HSR technologies realize looped network truly without seaming and cutting
Change, help to reduce the networking cost of transformer station process layer network.
HSR+PRP technologies are applied to transformer station process layer network, interchanger can not be reduced using PRP technologies merely
Quantity, and merely using HSR technologies because in ring bandwidth can not enough apply.The advantage of HSR and PRP technologies is integrated, is adopted in interval
HSR rings are formed with mode hand in hand, interchanger is not configured in interval, greatlys save switch device；Compartment uses PRP redundancies
Network, improve data transmission credibility.Using the above-mentioned network architecture in the case of a large amount of interchangers are saved, its data transfer is reliable
Property occur not less than the double net modes of conventional homologous redundancy, transmission link under N-1 defect situations, do not influence any defencive function,
So this network topology structure is the preferred solution that process-level network uses HSR+PRP technologies.
The standard synchronisation method of traditional intelligent substation network samples based on common clock signal dependent on pair when net
The reliability of network, setting network failure will cause combining unit, protection, measure and control device entry time desynchronizing state, protection, observing and controlling
Device will be unable to correctly realize the synchronization of SV messages, and leads to not correctly carry out data calculating and acted accordingly.
In recent years, it is the synchronous reliability of raising network samples, it is proposed that the switch technology based on Time delay measurement, passed by offset data
Sample-synchronous is realized in defeated delay, realizes network samples independent of common clock signal.
It is similar with the process-level network of routine, using under HSR/PRP technical situations, it is lined up in data transmission procedure because possible
Cause data forwarding delay also not know, equally exist network samples stationary problem.Therefore it is to realize HSR/PRP technologies in intelligence
The application of transformer station, it is necessary to solve network samples stationary problem.
It is distributed that a kind of looped network decentralized bus protection synchronous method (CN201310700082.6) discloses a kind of looped network
Bus protection synchronous method, add measurement to be delayed using constant time lag for sample-synchronous and amendment samples message delay amendment in real time
Domain, after looped network bus protection spacer units obtain all spacer units sampling messages, prolonged by parsing to be delayed to sample in amendment domain
Shi Jinhang softwares interpolation is synchronous.The invention can not solve intelligence only for HSR looped network decentralized bus protection certain applications
Using HSR looped networks, across the sample-synchronous problem being spaced under the complex topology structure using PRP networks in transformer station interval.
The content of the invention
The purpose of the present invention is：A kind of HSR/PRP network samples synchronous method based on data forwarding Time delay measurement is provided,
Solve the problems, such as that HSR/PRP network samples modes rely on common clock signal.
The present invention adopts the technical scheme that：Under intelligent substation HSR/PRP technology application scenarios, by merging list
The transmission delay mode on RedBox interfaces is recorded in the SV messages that member is sent realizes SV messages receiving device (such as protection, observing and controlling
Device) side time synchronized.Each combining unit is passed through by way of increasing time-domain in SV messages for record SV messages
RedBox interface data Forwarding Latency provides may.When SV messages pass through RedBox interfaces, RedBox input port is responsible for
Recording the input time (t1) of SV messages, RedBox output port is responsible for recording the output time (t2) of SV messages, and by t2-
T1 value is added up to obtain what SV messages transmitted on web-transporting devices at different levels with original time value in message time domain
Transmission time and.SV messages receiving device records the message arrival SV message receiving device network interface times when receiving SV messages
Come, and the value in message time domain is subtracted with the time value, its sampling instant is extrapolated according to the specified delay of combining unit, and
Sample-synchronous is carried out on the basis of calculating obtained sampling instant.
A kind of realization of the HSR/PRP network samples synchronous method based on data forwarding Time delay measurement, it is as follows：
Domain field of being set aside some time in combining unit tissue SV messages simultaneously resets the value of the field, for RedBox interfaces
The Forwarding Latency of recorded message in a device.RedBox interfaces need to record current time T1 in message entry port,
When message exports from the other ports of RedBox interfaces, the time value T2 of RedBox interface recorded message output times, data are obtained
Forwarding Latency T2-T1, obtained as shown in figure 1, being added (i.e. △ T=T0+T2-T1) with the value with the existing value T0 in message time domain
To cumulative delay, result of calculation is saved in message time domain and sends jointly to next unit with message.If next dress
Put equally is that RedBox interfaces will repeat said process.When SV messages in HSR rings, between HSR rings and PRP networks by multiple
When RedBox is forwarded, the time-domain adds up the transmission delays of each RedBox interfaces, when passing through interchanger in PRP network transmissions
The data transfer delay of cumulative interchanger, to realize that the SV messages of equipment between HSR rings, HSR rings and PRP networks accumulate transmission time
Accurate measurement.If next unit is SV message receiving devices, by record message reach SV message receiving devices when
Between, and subtract with the value value △ T in message time domain and obtain the value of message delivery time, then subtract default combining unit volume
Fixed delay obtains sampling instant, and SV messages receiving device is synchronized with the value at this moment with other SV messages, and for follow-up
Calculate.
The program calculates message data Forwarding Latency on RedBox interfaces, passes through the input time of recorded message, output
The mode of time and calculating difference obtains transmission delay, and this method is realized (FPGA, PHY etc. are realized) by hardware completely, it is not necessary to
CPU participates in calculating, so the factor such as network traffics will not have an impact to SV message receiving device synchronization SV messages, solves net
During the sample-synchronous dependence pair of road the problem of system.
Beneficial effects of the present invention：The present invention can independent of pair when system on the basis of, realize intelligent substation
Under HSR/PRP technology application scenarios, especially simultaneously using under the complex network topologies of HSR and PRP technologies, SV messages connect
Receiving unit receives the synchronization that each combining unit sends SV messages, solves network samples synchronously asking dependent on setting network
Topic.
Brief description of the drawings
In order to which the invention will be further described, accompanying drawing is provided：
Fig. 1 is RedBox Forwarding Latency instrumentation plans；
Fig. 2 is that the SV messages Forwarding Latency under intelligent substation HSR/PRP network modes accumulates schematic diagram.
Embodiment
Under intelligent substation HSR/PRP technology application scenarios, process-level network is mainly by RedBox interfaces and interchanger
(PRP networks) is formed, and protection, measure and control device receive the SV messages from combining unit, and protection, measure and control device side have sampling same
Step demand.
It is as shown in Figure 2 that combining unit sends SV message processes：
1. combining unit is organized according to the timing of transmission interval and sends SV messages, combining unit is in tissue SV messages every time
Retain to set aside some time in messages and field (time-domain) and reset the value of time-domain.
2. current time is recorded when the message input internally of the RedBox interfaces of combining unit and output port respectively, two
The individual moment asks difference to obtain data forwarding delay △ T1, and △ T1 are saved in message time domain and send jointly to next with message
Device.
3. the RedBox interfaces of circuit record current time, two moment respectively in the input of SV messages and output port
Ask difference to obtain data forwarding delay △ T2, be added to obtain cumulative delay (△ T with the existing value △ T1 in message time domain with the value
=△ T1+ △ T2), result of calculation △ T are saved in message time domain to be sent jointly to measure and control device with message；Meanwhile
RedBox interfaces record current time, two moment respectively when message inputs and exports to route protection internal receipt port
Ask difference to obtain data forwarding delay △ T2 ', be added to obtain cumulative delay (△ with the existing value △ T in message time domain with the value
T '=△ T1+ △ T2 '), recorded message enters the time for protecting internal receipt port to route protection simultaneously, and the time subtracts △ T '
The time value of combining unit SV message delivery times is obtained, its sampling instant is extrapolated according to the specified delay of combining unit,
And using this value as according to the work such as the synchronization for carrying out SV messages and follow-up calculating.
4. the RedBox interfaces of measure and control device input and recorded respectively during output port current time in SV messages, two
Moment asks difference to obtain data forwarding delay △ T3, is added to obtain with the value with the existing value (△ T1+ △ T2) in message time domain
Cumulative delay (△ T=△ T1+ △ T2+ △ T3), result of calculation △ T are saved in message time domain to be sent with message；Together
When, RedBox interfaces record current time respectively when SV messages input and export to measure and control device internal receipt port, and two
The individual moment asks difference to obtain data forwarding delay △ T3 ', is added to obtain accumulation with the existing value △ T in message time domain with the value and prolongs
When (△ T '=△ T1+ △ T2+ △ T3 '), recorded message enters time of internal receipt port to measure and control device simultaneously, and the time subtracts
Go △ T ' to obtain the time value of combining unit SV message delivery times, its sampling is extrapolated according to the specified delay of combining unit
Moment, and using this value as according to the work such as the synchronization for carrying out SV messages and follow-up calculating.
5.PRP network RedBox interfaces record current time, two moment respectively in message input and output port
Ask difference to obtain data forwarding delay △ T4, be added to obtain with the value with the existing value (△ T1+ △ T2+ △ T3) in message time domain
Cumulative delay (△ T=△ T1+ △ T2+ △ T3+ △ T4), result of calculation △ T are saved in message time domain to be risen with message one
It is sent to PRP networks.
6.LAN_A may include more process layer switch, using based on the measurable process layer switch technology that is delayed, survey
Measure and continue to build up data forwarding delay (△ T=△ T1+ △ T2+ △ T3+ △ T4+ △ T5), result of calculation △ T are saved in message
In time-domain busbar protective device is sent collectively to message.
7. bus protection receives SV messages from LAN_A networks, and record the time that SV messages enter protection device, this when
Between subtract the value △ T in SV message times domain and obtain the time values of combining unit SV message delivery times, according to combining unit
Its sampling instant is extrapolated in specified delay, and bus protection typically receives the SV sampled datas of multiple combining units, taken similar
Method can obtain each combining unit and sample the original moment, can complete the work such as the synchronization of SV messages and follow-up calculating on this basis
Make.
Claims (4)
1. a kind of HSR/PRP network samples synchronous method based on data forwarding Time delay measurement, it is characterized in that：Sent out in combining unit
Domain field of being set aside some time in SV messages is sent to be used to record SV messages accumulation transmission delay；In the seamless redundancy protocol HSR/ of high reliability
Timestamp is beaten SV messages on the basic communication unit RedBox of Parallel Redundancy Protocol PRP networks input and output port, and will
Transmission delay of the SV messages on RedBox is recorded in the time-domain of SV messages；When the SV messages turn by multiple RedBox
During hair, the time-domain adds up the transmission delays of each RedBox interfaces；SV data receivers receive after SV messages with it is local when
Between on the basis of, SV message times are received with SV data receivers and subtract the value of time-domain to calculate the delivery time of SV messages,
And its sampling instant is extrapolated according to the specified delay of combining unit, SV data receivers are to the different combining units that receive
Sampled data synchronize.
2. a kind of HSR/PRP network samples synchronous method based on data forwarding Time delay measurement as claimed in claim 1, it is special
Sign is：Domain field of being set aside some time in combining unit sends SV messages is used for recorded message and accumulates transmission delay, the transmission delay
Using ns as least unit, the transmission delay of enough field record RedBox interfaces is reserved.
3. a kind of HSR/PRP network samples synchronous method based on data forwarding Time delay measurement as claimed in claim 1, it is special
Sign is：When SV messages pass through multiple RedBox forwardings in HSR rings, between HSR rings and PRP networks, the time-domain adds up each
The transmission delay of RedBox interfaces, the data transfer delay of cumulative interchanger during interchanger is passed through in PRP network transmissions, with reality
The SV messages accumulation transmission time of equipment accurately measures between existing HSR rings, HSR rings and PRP networks.
4. a kind of HSR/PRP network samples synchronous method based on data forwarding Time delay measurement as claimed in claim 1, it is special
Sign is：SV data receivers can interpolate that in message first after SV messages are received with domain field message of setting aside some time
Whether the time domain information of carrying in the reasonable scope, will judge message as false alarm when time domain information, which exceeds, limits scope
Text simultaneously carries out discard processing to message, and time recovery and synchronous is carried out to correct message.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108233322A (en) * | 2018-01-26 | 2018-06-29 | 南京南瑞继保电气有限公司 | A kind of sampling system based on optical fiber series connection |
| CN109600289A (en) * | 2018-12-06 | 2019-04-09 | 中国电力科学研究院有限公司 | Intelligent substation is in HSR looped network and data receiving-transmitting method and protection between looped network |
| CN109831246A (en) * | 2019-02-27 | 2019-05-31 | 南京电研电力自动化股份有限公司 | A kind of route equation of light synchronous method based on HSR |
| CN109946513A (en) * | 2019-03-26 | 2019-06-28 | 江苏凌创电气自动化股份有限公司 | Based on across the gap digit change metering method of the absolute compensation of delay of network samples, apparatus and system |
| CN113364126A (en) * | 2021-06-19 | 2021-09-07 | 国网福建省电力有限公司 | Automatic configuration method for sampling homology comparison function of intelligent substation |
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| CN113364126A (en) * | 2021-06-19 | 2021-09-07 | 国网福建省电力有限公司 | Automatic configuration method for sampling homology comparison function of intelligent substation |
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Application publication date: 20171117 |