CN104901758B - A kind of biplane clock synchronizing method applied to wide area protection control system - Google Patents
A kind of biplane clock synchronizing method applied to wide area protection control system Download PDFInfo
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- CN104901758B CN104901758B CN201510172523.9A CN201510172523A CN104901758B CN 104901758 B CN104901758 B CN 104901758B CN 201510172523 A CN201510172523 A CN 201510172523A CN 104901758 B CN104901758 B CN 104901758B
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Abstract
A kind of biplane clock synchronizing method applied to wide area protection control system includes the following steps：The domain protective device of standing receives the sampled value of combining unit, calculates the sampled value and is arrived at a station domain protective device treated transmission delay by sampling instant from primary current/voltage, and is marked with the domain protective device clock of itself of standing；The relative time that domain protective device of standing is measured in real time between the clock plane of itself and wide area protection network clocking plane is poor；Domain protective device of standing obtains primary current/voltage to the transmission delay of Wide Area Network clock plane, marks domain protective device of arriving at a station to be sent to the specified delay path position of wide area main website sampled value the transmission delay, is transmitted to Wide Area Network；Wide area main website obtains sampled value with transmission delay markers from Wide Area Network.The present invention ensures that there is no angular differences between each road analog quantity, embody " who is synchronized with whom " principle.Wide Area Network carries out time synchronization using a master clock, this master clock is without the Big Dipper/GPS time services outside relying on.
Description
Technical field
The invention belongs to relay protection of power system and technical field of automation, and in particular to be protected to a kind of wide area that is applied to
Protect the biplane Clock Synchronization Technology of control system.
Background technology
Protective device in electric system is interconnected by optical fiber, information sharing, multiple spot information in acquisition system, according to net
Network topological structure to failure quickly, reliably, accurately cut off, to being after the excision of analysis fault point using the information of acquisition
The system safe and stable operation influence brought and the safe operation for taking corresponding control strategy to ensure power grid, this collection is protected and oneself
Dynamic control function is known as wide area protection control system in the system of one.
Interconnection of the wide area protection mainly between substation is protected and is controlled, and carrying out comprehensive analysis to information makes
Corresponding decision, the protection that wide area protection is related to will be not limited to several devices and several substations, and information transmission
How distance ensures discontinuity surface when all information is synchronized to same, is that a comparison is difficult to resolve certainly problem.Passing wide area
The synchronization of Protection control system all relies on and carries out time service based on the Big Dipper/GPS, by absolute time information on the data band of acquisition.
But if the Big Dipper/GPS signal because the reasons such as weather fail, can synchronization failure, influence to protect, cause protection blocking.
Invention content
In order to overcome the above-mentioned deficiencies of the prior art, the present invention provides a kind of applied to the double of wide area protection control system
Plane clock synchronous method.Wide area protection control system is flat by station domain protective device itself clock plane and Wide Area Network clock
Delay of the primary current/voltage to wide area main website protective device is measured in the conversion in face, to realize the synchronization of data, solution
Original wide area system of having determined is necessarily dependent upon the problem of Big Dipper/GPS time services.
The present invention specifically uses following technical scheme：
A kind of biplane clock synchronizing method applied to wide area protection control system, which is characterized in that including following step
Suddenly：
(1) domain protective device of standing receives the sampled value of combining unit, calculates the sampled value and arrives at a station from primary current/voltage
Domain protective device normal delay time, domain protection which includes the delay of combining unit and combining unit is arrived at a station
Transmission delay between device (is arrived at a station due to combining unit and is transmitted using optical fiber between the protective device of domain, which can be with
Ignore) and the normal delay time is measured with the crystal oscillator clock plane for domain protective device itself of standing；
(2) it stands between the whole second and Wide Area Network clock whole second of itself crystal oscillator clock of domain protective device real-time measurement apparatus
Relative time is poor, and the crystal oscillator clock plane of computer installation domain protective device itself and the conversion scale of Wide Area Network clock plane close
System；
Sampled value, processing time was accumulated in the normal delay time in the domain protective device of station, was obtained according to step (2)
Conversion relation between the two clock planes arrived, the normal delay time value conversion after adding up is Wide Area Network clock plane
Time, to obtain with Wide Area Network clock plane the sampled value that marks from primary current/voltage to Wide Area Network
Transmission delay, and using the sampled value from primary current/voltage to the transmission delay Wide Area Network as sampled value
Specified delay is filled into the specified delay path position for sending sampling value message, is sent to Wide Area Network；
(4) wide area main website protective device is obtained from Wide Area Network with from primary current/voltage to Wide Area Network
The sampled value of transmission delay；
(5) the whole second of itself crystal oscillator clock of wide area main website protective device real-time measurement apparatus and Wide Area Network clock whole second it
Between relative time it is poor, calculate two clock planes conversion scale relationship；
(6) wide area main website protective device will be converted into certainly from primary current/voltage to the transmission delay Wide Area Network
The clock plane time of body crystal oscillator, in order to ensure the synchronization of sample values that each different station domain protective device was sent
Property, sampled value is subjected to Lagrange's interpolation synchronization.
The present invention is applied to wide area protection control system, realizes the change of different access ways in wide area protection control system
Data synchronize between power station and different interval, by the clock plane of device itself and the clock plane of Wide Area Network, measure
Primary current/voltage arrives at a station the delay of domain/wide area protection device, and for wide area protection device, it is straight that this equates optical fiber
The point-to-point mode connect in succession successfully solves original wide area protection control system and is necessarily dependent upon the Big Dipper/GPS progress time services,
If because of the problem of reasons such as weather lead to the Big Dipper/GPS failures, and wide area protection must be latched or exit.
Secondly, for internal procedure layer sampled value transmission mode of standing, networking transmission and point pair can be selected according to actual conditions
Point transmission, this also can be that more substations access wide area protection control system creation convenience, be conducive to wide area guarantor
Protect the popularization of control system.
Description of the drawings
Fig. 1 is the wide area protection control system figure of the present invention；
Fig. 2 is device itself clock plane and Wide Area Network clock plane conversion figure；
Fig. 3 is the sampling value message frame format for being sent to Wide Area Network；
Fig. 4 is the position of flag transmission delay；
Fig. 5 is that interpolation synchronizes figure.
Specific implementation mode
Below in conjunction with the accompanying drawings and specific embodiment the present invention is described in more detail.
As shown in Figure 1, wide area protection control system passes through Wide Area Network by each station domain protective device, wide area protection device
Be attached, the hardware of each device, software are completely the same on network, each device according to be configured as station domain or wide area protect
Shield, the data for domain protective device acquisition our station of standing, it is shared to carry out whole network by Wide Area Network.There are one entire Wide Area Networks
Unified master clock sets time whole network, which may not need the Big Dipper/GPS time services.
In each different substation, the transmission of the station internal procedure layer sampled data for domain protective device of standing can be according to reality
Border situation is transmitted using point-to-point and networking, because of either which kind of transmission mode, domain of standing/wide area protection device is
Need to obtain the sampled value of section at the same time.It is converted by device itself crystal oscillator clock and Wide Area Network clock so that institute
It is section at the same time from the sampled value of primary current/voltage domain protective device of arriving at a station.
The present invention specifically uses following technical scheme：
(1) calculate sampled value from primary current/voltage arrive at a station domain protective device between the normal delay time, and with
Domain crystal oscillator time plane of standing is measured
(a) when the process layer sampling for domain protective device of standing is point-to-point configuration：Combining unit does not connect lock-out pulse, sampling
Normal delay is configured in data frame and is concentrated in sampling transmission data, domain protective device of standing is obtained directly from sample data frames and adopted
Sample value from primary current or voltage arrive at a station domain protective device between transmission delay Ti；
(b) when the process layer sampling for domain protective device of standing is networking configuration：Due to sampling instant and station domain protective device
It is time synchronization, the sampling time is consistent with the station domain protective device external clock synchronization time.Sampled value from primary current/voltage to
Transmission delay between domain protective device of standing, be equivalent to device itself the crystal oscillator second edge and the second of external clock synchronization time along between
Time difference Ti；
It is that crystal oscillator counts by transmission delay Ti conversions.Ti is usually to be indicated using microsecond, and a crystal oscillator digit is 10
Nanosecond, the then time after converting are Tt=Ti*1000/10.
(2) time difference of computer installation domain protective device own layer and Wide Area Network clock plane
As shown in Fig. 2, Inpps indicates station domain protective device itself crystal oscillator time shaft, wherein including a cycle counter
Tclock often passes through 1 digit (about 10 nanoseconds), and the count value of time shaft adds 1.The counting rate of Tclock is by crystal oscillator
Actual frequency determine, the physical characteristic of crystal oscillator determine crystal oscillator frequency in a short time will not saltus step, therefore the meter of Tclock
Number units can remain stable within very long a period of time, therefore Tclock can be considered as a stabilization, will not saltus step time shaft.
When the second of Wide Area Network clock is along arrival, crystal oscillator loop counter value nHwG this moment is recorded；When the second of the time of crystal oscillator itself
Along when arriving, crystal oscillator loop counter value nHwC this moment is recorded；The difference of both nHwG and nHwC, as two clock planes when
Between it is poor.The difference nHwClkPeriod of crystal oscillator cycle counter of each two crystal oscillator second between when arriving, then be the crystal oscillator whole second
Time.By the difference divided by nHwClkPeriod of both nHwG and nHwC, then the conversion scale of two clock planes is obtained.
(3) all delays are filled into the specified delay path position of sampled value by domain protective device of standing, and are sent to wide area
Network
Due to the sampled value from primary current/voltage, sample frequency is above the sample frequency of station domain protective device, so
For sampled value in station domain protective device domestic demand resampling, which needs domain protective device progress operation of standing, and will produce processing
Time Tc, the processing time, Tc was indicated with crystal oscillator count value.Data after resampling need to be sent to Wide Area Network, the sampling
Value Data message frame format can copy the IEC61850-9-2 agreements of SV messages.Message format is by message frame head and application protocol
Data cell APDU two parts are constituted as shown in figure 3, wherein ethernet type code is 0x88BB, for distinguishing SV messages.Entirely
Sampled value is from changing between two clock planes that the normal delay time (Tt+Tc) of primary current/voltage passes through step (2)
Calculation relationship, convert configure for the time Ta of Wide Area Network clock plane it is (specified in the 0th channel that sampling transmission data is concentrated
Delay path), as shown in Figure 4.
(4) wide area main website protective device obtains the sampled value with transmission delay from Wide Area Network
Wide area main website protective device receives sampled value from Wide Area Network, is obtained (such as from the 0th channel that transmission data is concentrated
Step (3)) conversion be Wide Area Network clock plane time Ta.
(5) the whole second of itself crystal oscillator clock of wide area main website protective device real-time measurement apparatus and Wide Area Network clock whole second
Between relative time it is poor, calculate two clock planes conversion scale relationship
As shown in Fig. 2, Inpps indicates wide area main website protective device itself crystal oscillator time shaft, when the second of Wide Area Network clock
Along when arriving, crystal oscillator loop counter value nHwG this moment is recorded；When the second of the time of crystal oscillator itself is along arrival, record is this moment brilliant
Loop counter value of shaking nHwC；The difference of both nHwG and nHwC, the relative time between the whole second of as two clock planes are poor.
The difference nHwClkPeriod of crystal oscillator cycle counter of each two crystal oscillator second between when arriving, then be the time of crystal oscillator whole second.
By the difference divided by nHwClkPeriod of both nHwG and nHwC, then the conversion scale relationship of two clock planes is obtained.
(6) transmission delay is converted into the clock plane time of itself crystal oscillator by wide area main website protective device, in order to ensure
It is each not
With the synchronism for the sample values that station domain protective device was sent, it is same that sampled value is subjected to Lagrange's interpolation
Step
Sampled value from the transmission delay time Ta of primary current/voltage, is passed through step (5) by wide area main website protective device
The two clock plane conversion scale relationships obtained, change Tw, the sampled value that station domain protective devices all in this way sends over into
The transmission delay time, changed into the Tw that wide area main website protective device is measured with itself crystal oscillator clock plane.It stands 1 channel of domain
Delay time is labeled as Tw1, and the delay time in 2 channel of domain of standing is labeled as Tw2, and the delay time for domain N channel of standing is labeled as Twn.
Since the delay of analog quantity channel that different station domain protective devices send over is not necessarily equal, Tw1, Tw2, Twn also not phase
Deng.And wide area main website protective device carries out protection operation, and the analog quantity channel data for bringing each station domain is needed to be synchronized to
Section at the same time.Sample values synchronize, and lagrange-interpolation may be used and synchronized into row interpolation, as shown in Figure 5.
On the basis of the clock plane of wide area main website protective device, the analog quantity that different station domain protective devices send over is resampled to
Synchronization ensures between each road analog quantity after Lagrangian resampling, in the protection operation of wide area protection master station device
There is no angular differences, embody " who is synchronized with whom " principle.
It is that present invention applicant combines Figure of description detailed description made for the present invention and description above, in detail
Illustrate to be intended merely to that reader is helped to more fully understand spirit of that invention, and it is not intended to limit the protection scope of the present invention, on the contrary, appointing
What should all be fallen within the scope and spirit of the invention based on any improvement or modification made by spirit of that invention.
Claims (3)
1. a kind of biplane clock synchronizing method applied to wide area protection control system, which is characterized in that the method includes
Following steps：
(1) the domain protective device of standing receives the sampled value of combining unit, calculates the sampled value and is protected from primary current/voltage domain of arriving at a station
The normal delay time of protection unit, which includes the delay of combining unit and combining unit is arrived at a station domain protection dress
Transmission delay between setting, and the normal delay time is measured with the crystal oscillator clock plane for domain protective device itself of standing；
(2) it stands opposite between the whole second and Wide Area Network clock whole second of itself crystal oscillator clock of domain protective device real-time measurement apparatus
Time difference, the conversion scale relationship of the crystal oscillator clock plane and Wide Area Network clock plane of computer installation domain protective device itself；
(3) sampled value, processing time was accumulated in the normal delay time in the domain protective device of station, was obtained according to step (2)
Two clock planes between conversion relation, will it is accumulative after the conversion of normal delay time value be Wide Area Network clock plane
Time, to obtain with Wide Area Network clock plane the sampled value that marks from primary current/voltage to Wide Area Network
Transmission delay, and using the sampled value from primary current/voltage to the transmission delay Wide Area Network as the volume of sampled value
Fixed delay is filled into the specified delay path position for sending sampling value message, is sent to Wide Area Network；
(4) wide area main website protective device is obtained from Wide Area Network with from primary current/voltage to the transmission Wide Area Network
The sampled value of delay；
(5) between the whole second of itself crystal oscillator clock of wide area main website protective device real-time measurement apparatus and Wide Area Network clock whole second
Relative time is poor, calculates the conversion scale relationship of two clock planes；
(6) it is based on the conversion scale relationship for two clock planes that step (5) is calculated, wide area main website protective device will be from one
Primary current/voltage is converted into the time that the clock plane of itself crystal oscillator is measured to the transmission delay between Wide Area Network, is
The synchronism for the sample values that each different station domain protective devices of guarantee were sent, carries out Lagrange by sampled value and inserts
Value synchronizes.
2. biplane clock synchronizing method according to claim 1, it is characterised in that：
In step (1), when the process layer sampling transmission mode for domain protective device of standing is point-to-point configuration, domain protective device of standing
Directly from sample data frames obtain sampled value from primary current or voltage arrive at a station domain protective device between the normal delay time；
When the process layer sampling transmission mode for domain protective device of standing is networking configuration, sampled value is arrived at a station from primary current/voltage
The normal delay time between the protective device of domain is equivalent to the crystal oscillator second edge and external clock synchronization time of station domain protective device itself
Second along between time difference.
3. biplane clock synchronizing method according to claim 2, it is characterised in that：
Normal delay time noise is counted for crystal oscillator, the normal delay time indicates that a crystal oscillator digit is using microsecond
10 nanoseconds, the then time after converting are Tt=normal delay times * 1000/10.
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| CN106953706A (en) * | 2017-02-17 | 2017-07-14 | 北京汽车集团有限公司 | Audio-visual system synchronous method based on Ethernet, device and system |
| CN107483291B (en) * | 2017-09-04 | 2020-07-03 | 石家庄科林电气股份有限公司 | Optical fiber longitudinal differential time synchronization method |
| CN108377265B (en) * | 2018-02-07 | 2020-10-16 | 南京南瑞继保电气有限公司 | Real-time synchronization method for control protection distributed system in power system |
| CN114362373B (en) * | 2022-01-14 | 2024-03-19 | 南京国电南自电网自动化有限公司 | Intelligent substation sampling self-adaptive synchronization method and system |
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| CN102570617A (en) * | 2012-02-17 | 2012-07-11 | 黑龙江省电力有限公司 | Method for realizing wide area protection system among multiple substations |
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| CN102148652B (en) * | 2011-02-17 | 2014-12-03 | 上海奇微通讯技术有限公司 | System and method for measuring network clock synchronization |
| US9106353B2 (en) * | 2011-12-13 | 2015-08-11 | Jds Uniphase Corporation | Time synchronization for network testing equipment |
| CN103532237A (en) * | 2013-10-21 | 2014-01-22 | 中国南方电网有限责任公司 | Wide-area protection control system based on IEEE1588 network timing protocol |
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