CN110535551A - The synchronous method and system of failure wave-recording sampled data in a kind of electric system - Google Patents
The synchronous method and system of failure wave-recording sampled data in a kind of electric system Download PDFInfo
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- CN110535551A CN110535551A CN201910917717.5A CN201910917717A CN110535551A CN 110535551 A CN110535551 A CN 110535551A CN 201910917717 A CN201910917717 A CN 201910917717A CN 110535551 A CN110535551 A CN 110535551A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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Abstract
The invention discloses the synchronous method and system of failure wave-recording sampled data in a kind of electric system characterized by comprising analyzes and save the failure wave-recording sampling SV message data for being labeled with hardware absolute time mark of each combining unit of substation；Benchmark combining unit is chosen, using the absolute time mark of benchmark combining unit as the absolute time mark of synchronization point；Location of interpolation is found out according to the absolute time mark of synchronization point, calculates the interpolated data of synchronization point, is respectively completed the synchronization interpolation of wave-recording sampling data.The present invention does not depend on whole station synchronization signal, when solving large number of SV access, the limited problem of FPGA synchrodata computing resource, realize the Power System Fault Record sampling data synchronization under non real-time system, the accuracy of sampled data and the consistency of amplitude are improved, is had a good application prospect.
Description
Technical field
The present invention relates to technical field of electric power automation, and in particular to failure wave-recording sampled data in a kind of electric system
Synchronous method and system.
Background technique
In intelligent substation of electric power system, there are two types of schemes for failure wave-recording sample mode, and one is be based on external source (GPS
Synchronizing device) synchronous source synchronized sampling, under this mode, all samplings, which all synchronize under the pulse per second (PPS) of GPS, is adopted
Sample；Another kind is that synchronization is directly adopted in the end synchronous without external source, is sampled under the crystal oscillator beat of each leisure oneself.As electric power
The oscillograph of system black box wants that both acquisition data can be accessed.When oscillograph accessed in a manner of point-to-point it is large number of
Outside asynchronous-sampling when source data, oscillograph need to synchronize the sampled data from distinct device, realize system large disturbances such as
The writing function of primary system voltage, electric power whens short trouble, system concussion, collapse of voltage etc. and its derived quantity.Because outer
Source is large number of, and in order to which recording waveform can analyze the amplitude attenuation not less than 25 subharmonic no more than 5%, uses
Largange second order interpolation, synchronous for interpolation, in order to meet the precision of recorder data, calculation amount is larger, if using FPGA
Data processing is carried out, it is very high to the capacity requirement of FPGA, it will increase the cost of power system fault recorder.Therefore, urgently
Need a kind of method for solving fault recorder data and synchronizing.
Summary of the invention
To solve deficiency in the prior art, the present invention provides a kind of synchronization of failure wave-recording sampled data in electric system
Method and system are solved when existing Power System Fault Record device accesses the outer source data of large number of asynchronous-sampling and are used
FPGA, which is synchronized, brings hardware cost excessively high and the inadequate problem of synchronization accuracy.
In order to achieve the above objectives, the present invention adopts the following technical scheme: failure wave-recording hits in a kind of electric system
According to synchronous method, comprising:
Analyze and save the failure wave-recording sampling SV message for being labeled with hardware absolute time mark of each combining unit of substation
Data；
Benchmark combining unit is chosen, using the absolute time mark of benchmark combining unit as the absolute time mark of synchronization point；
Location of interpolation is found out according to the absolute time mark of synchronization point, calculates the interpolated data of synchronization point, is respectively completed record
The synchronization interpolation of wave sampled data.
Further, it analyzes and the failure wave-recording for being labeled with hardware absolute time mark for saving each combining unit of substation is adopted
Sample SV message data, specifically:
Each frame SV message is parsed, sample information is extracted, it is each power transformation that sample information, which includes absolute time mark and sampled value,
Combining unit of standing distributes a SV deque, and sample information is stored in the tail of the queue of corresponding SV deque.
Further, benchmark combining unit is chosen, using the absolute time mark of benchmark combining unit as the absolute of synchronization point
Markers, specifically:
Team's head node of all SV deques is scanned, merging list of the absolute time mark dispersion less than 1 microsecond is therefrom chosen
Member is used as benchmark combining unit, using the absolute time mark of benchmark combining unit as the absolute time mark of synchronization point.
Further, location of interpolation is found out according to the absolute time mark of synchronization point, specifically:
Synchronous location of interpolation is found out according to formula (1),
(tsyn-t'k)×(tsyn-t'k-1)≤0 (1)
Obtain the absolute time mark and sampled value of three sampled points of interpolation: (t'k,x'k)、(t'k-1,x'k-1)、(t'k-2,
x'k-2), in which: t 'kFor k-th of sampling instant markers of certain combining unit, x 'kFor the sampling of k-th of sampling instant of certain combining unit
Value；t'k-1For -1 sampling instant markers of certain combining unit kth, x 'k-1For the sampling of certain -1 sampling instant of combining unit kth
Value；t'k-2For -2 sampling instant markers of certain combining unit kth, x 'k-2For the sampling of certain -2 sampling instant of combining unit kth
Value.
Further, the interpolated data of synchronization point is calculated, specifically:
Synchronization point t is calculated according to second order interpolation formula (2)synSampled data xsyn:
xsyn=x'k×Lk+x'k-1×Lk-1+x'k-2×Lk-2 (2)
Wherein:
The synchronization system of failure wave-recording sampled data in a kind of electric system, which is characterized in that reported including one or more
Literary acquisition unit, the recorder data processing unit being connect with message acquisition unit.
Further, message acquisition unit is that FPGA message capture card is given for acquiring substation's combining unit SV message
SV message stamps hardware markers, and sends recorder data processing unit to.
Further, recorder data processing unit is CPU, and CPU carries non-real time operating system.
Further, CPU carries Linux non-real time operating system.
Further, message capture card embeds 8 ethernet controllers and 1 PCIE controller.
Advantageous effects of the invention: present invention employs based on high-precision hardware when the non real-time system of target adopt
Sample synchronous method reduces the hardware cost of Power System Fault Record, improves data synchronization accuracy.
The present invention does not depend on whole station synchronization signal, and when solving large number of SV access, FPGA synchrodata calculates money
The limited problem in source, realizes the Power System Fault Record sampling data synchronization under non real-time system, improves sampled data
The consistency of accuracy and amplitude, has a good application prospect.
Detailed description of the invention
Fig. 1 is SV message acquisition system schematic diagram of the present invention；
Fig. 2 is the synchronous work flow diagram of data of the present invention；
Fig. 3 is data structure schematic diagram defined in data of the present invention synchronize.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following embodiment is only used for clearly illustrating the present invention
Technical solution, and not intended to limit the protection scope of the present invention.
Embodiment 1:
As shown in Figure 1, in a kind of electric system failure wave-recording sampled data synchronization system, including one or more messages
Acquisition unit, the recorder data processing unit being connect with message acquisition unit.
Message acquisition unit is the FPGA message capture card for acquiring substation's combining unit SV message, and FPGA message is adopted
Truck is built using the high EP3C55 money FPGA of cost performance, and each message capture card embeds 8 ethernet controllers and 1 PCIE
(high speed serialization computer expansion bus standard) controller.Message capture card is responsible for acquiring substation's combining unit SV message, gives
SV message stamps hardware markers, is transmitted to recorder data processing unit by PCIE bus.
The clock that each FPGA message capture card receives the high precision clock generator of recorder data processing unit CPU is synchronous
Signal safeguards that a resolution ratio is not less than the absolute time mark of 10 nanoseconds, and FPGA is stamped absolutely when receiving first bit of message
To markers, CPU is then transmitted to dma mode by PCIE controller.
Recorder data processing unit is CPU, low-power-consumption embedded using Intel Celeron Process N2806 double-core
CPU processor, CPU carry Linux non-real time operating system.Data (refer to the SV message and each SV report of the acquisition of message capture card
The high-precision markers that text is stamped) receive operate in linux kernel state；
Embodiment 2:
The synchronous method of failure wave-recording sampled data in a kind of electric system, comprising steps of
Step 1: message data acquisition acquires the SV message of several combining units of substation simultaneously by FPGA message capture card
High-precision hardware absolute time mark is stamped respectively.FPGA message capture card is stamped when receiving first bit of SV message
The hardware absolute time mark t of (markers resolution ratio was better than for 10 nanoseconds) in high precisionk, by PCIE bus with end to end system by SV message
It is transmitted to CPU；
Step 2: oscillograph data processing CPU being constituted using double-core low-power-consumption embedded processor, it is non real-time to carry Linux
The fault recorder data SV message of each combining unit is analyzed and saved to operating system；
The SV message of each combining unit is analyzed and saves, specifically:
CPU parses each frame SV message, extracts sample information, sample information includes absolute time mark tkAnd sampled value xk, it is every
A substation's combining unit distributes a SV deque, and each node of queue corresponds to the sampling letter of some sampling instant
Sample information, is stored in the tail of the queue of corresponding SV deque by breath.
As shown in figure 3, acquisition data enter from tail of the queue using both-end fifo queue, data are synchronous to be obtained from team's head, each
Node includes absolute time mark tk, the specified delay T of SVdAnd sampled value xk。
Step 3: choosing benchmark combining unit, team's head node of all SV deques of CPU timing scan, scan depths
1000 points, therefrom choosing absolute time mark dispersion, (time difference between i.e. adjacent two o'clock subtracts each other with the standard time difference exhausted less than 1 microsecond
The standard time difference to value less than 1 microsecond, such as between two o'clock is 250 microseconds, if the time difference between two o'clock is 251,249 microseconds,
It is then undesirable, if the time difference between two o'clock is 250.5 microseconds, meet requirement of the absolute time mark dispersion less than 1 microsecond)
Absolute time mark t of the combining unit as benchmark combining unit, using the absolute time mark of benchmark combining unit as synchronization pointsyn；
Step 4: other SV deque nodes are scanned respectively, according to the absolute time mark t of synchronization pointsynFind out interpolation position
It sets, calculates synchronization point tsynInterpolated data xsyn, it is respectively completed the synchronization interpolation of wave-recording sampling data.
Synchronous location of interpolation is found out according to formula (1), obtains the absolute time mark and sampled value of three sampled points of interpolation:
(t'k,x'k)、(t'k-1,x'k-1)、(t'k-2,x'k-2), wherein: t'kFor k-th of sampling instant markers of other certain combining units,
x'kFor the sampled value of other k-th of sampling instants of certain combining unit；t'k-1For other certain -1 sampling instants of combining unit kth
Markers, x'k-1For the sampled value of other certain -1 sampling instants of combining unit kth；t'k-2For other certain combining unit kth -2
Sampling instant markers, x'k-2For the sampled value of other certain -2 sampling instants of combining unit kth.To improve scan efficiency, every time
Remember interpolation point position, interpolation point position can directly be found from last time memory area next time.
(tsyn-t'k)×(tsyn-t'k-1)≤0 (1)
From formula (1) as can be seen that synchronous location of interpolation is located at t'k、t'k-1When engrave or between two moment；
Synchronization point t is calculated according to second order interpolation formula (2)synSampled data xsyn:
xsyn=x'k×Lk+x'k-1×Lk-1+x'k-2×Lk-2 (2)
Wherein:
Present invention employs based on high-precision hardware when the non real-time systematic sampling synchronous method of target reduce power train
The hardware cost of system failure wave-recording, improves data synchronization accuracy.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (10)
1. the synchronous method of failure wave-recording sampled data in a kind of electric system characterized by comprising
Analyze and save the failure wave-recording sampling SV message data for being labeled with hardware absolute time mark of each combining unit of substation；
Benchmark combining unit is chosen, using the absolute time mark of benchmark combining unit as the absolute time mark of synchronization point；
Location of interpolation is found out according to the absolute time mark of synchronization point, calculates the interpolated data of synchronization point, recording is respectively completed and adopts
The synchronization interpolation of sample data.
2. one of according to claim 1 in electric system failure wave-recording sampled data synchronous method, which is characterized in that point
The failure wave-recording sampling SV message data for being labeled with hardware absolute time mark of each combining unit of substation is analysed and saves, specifically
Are as follows:
Each frame SV message is parsed, sample information is extracted, sample information includes absolute time mark and sampled value, is closed for each substation
And unit distributes a SV deque, and sample information is stored in the tail of the queue of corresponding SV deque.
3. according to the synchronous method of failure wave-recording sampled data in the electric system of one of claim 2, which is characterized in that choosing
Benchmark combining unit is taken, using the absolute time mark of benchmark combining unit as the absolute time mark of synchronization point, specifically:
Team's head node of all SV deques is scanned, the combining unit for therefrom choosing absolute time mark dispersion less than 1 microsecond is made
For benchmark combining unit, using the absolute time mark of benchmark combining unit as the absolute time mark of synchronization point.
4. according to the synchronous method of failure wave-recording sampled data in the electric system of one of claim 3, which is characterized in that root
Location of interpolation is found out according to the absolute time mark of synchronization point, specifically:
Synchronous location of interpolation is found out according to formula (1),
(tsyn-t'k)×(tsyn-t'k-1)≤0 (1)
Obtain the absolute time mark and sampled value of three sampled points of interpolation: (t'k,x'k)、(t'k-1,x'k-1)、(t'k-2,x
'k-2), in which: t 'kFor k-th of sampling instant markers of certain combining unit, x 'kFor the sampling of k-th of sampling instant of certain combining unit
Value；t′k-1For -1 sampling instant markers of certain combining unit kth, x 'k-1For the sampling of certain -1 sampling instant of combining unit kth
Value；t′k-2For -2 sampling instant markers of certain combining unit kth, x 'k-2For the sampling of certain -2 sampling instant of combining unit kth
Value.
5. one of according to claim 1 in electric system failure wave-recording sampled data synchronous method, which is characterized in that meter
The interpolated data of synchronization point is calculated, specifically:
Synchronization point t is calculated according to second order interpolation formula (2)synSampled data xsyn:
xsyn=x'k×Lk+x'k-1×Lk-1+x'k-2×Lk-2 (2)
Wherein:
6. the synchronization system of failure wave-recording sampled data in a kind of electric system, which is characterized in that including one or more messages
Acquisition unit, the recorder data processing unit being connect with message acquisition unit.
7. according to the synchronization system of failure wave-recording sampled data in the electric system of one of claim 6, which is characterized in that report
Literary acquisition unit is FPGA message capture card, for acquiring substation's combining unit SV message, stamps hardware markers to SV message,
And send recorder data processing unit to.
8. according to the synchronization system of failure wave-recording sampled data in the electric system of one of claim 6, which is characterized in that record
Wave data processing unit is CPU, and CPU carries non-real time operating system.
9. according to the synchronization system of failure wave-recording sampled data in the electric system of one of claim 8, which is characterized in that
CPU carries Linux non-real time operating system.
10. according to the synchronization system of failure wave-recording sampled data in the electric system of one of claim 7, which is characterized in that
Message capture card embeds 8 ethernet controllers and 1 PCIE controller.
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