CN108833058A - A kind of method that Wide Area Measurement System communication process dynamic data is compressed, decompressed - Google Patents
A kind of method that Wide Area Measurement System communication process dynamic data is compressed, decompressed Download PDFInfo
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- CN108833058A CN108833058A CN201810512198.XA CN201810512198A CN108833058A CN 108833058 A CN108833058 A CN 108833058A CN 201810512198 A CN201810512198 A CN 201810512198A CN 108833058 A CN108833058 A CN 108833058A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
- H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0079—Formats for control data
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control
Abstract
The invention discloses a kind of compressions of Wide Area Measurement System communication process dynamic data,The method of decompression,This method passes through research real-time dynamic data transmission protocol,Phasor measurement unit end selects partial data format transmission at whole moment second,Non- whole moment second selects compressed data format transmission,Phasor measurement unit side pressure compression process includes DC_IDCODE compression,The compression of century second SOC,Phasor data compression,Frequency offset compression,Frequency change rate compression,Analog quantity compression and switching value compression,The phasor measurement unit end is by data frame transfer to data concentrator end,Data concentrator end passes through the detection of the data frame format transmitted to phasor measurement unit end,Identify the format of data frame,Compressed data frames are extruded by reading configuration frame and the data frame solution of last moment,And then it is reduced into the data frame for meeting transmission protocol.
Description
Technical field
The present invention relates to Real-Time Dynamic Monitoring System of Power system regions, are more particularly to a kind of Wide Area Measurement System communication
Process dynamics data compression, decompression method.
Background technique
With climate change, a large amount of new energy accesses power grid, and power grid is faced with more and more new challenges, power grid
Safe and stable operation and in real time monitoring become more and more important.It is more and more simultaneously as China's power grid is to intelligent development
Intelligent equipment start to put into the actual motion of power grid, such as phasor measuring set (Phasor measurement
Unit, PMU).Phasor measurement unit is measurement for synchronizing phasor and output and the device for carrying out dynamically recording,
Core includes synchronous phasor measurement based on standard clock signal, loses standard clock signal punctual ability, phasor measurement list
Real time communication and related communication protocol can be followed between member and data concentrator (PDC), main website.Data concentrator (PDC) is
The communication device for receiving for end data of standing, collecting and forwarding.The measurement data in multiple channels can be received simultaneously, and can be in real time
Measurement data is forwarded to multiple channels.By in a large amount of available the whole network of phasor measurement unit equipment of power distribution network node installation
Synchronized phasor data of each node, and extensive operation and utilization can be carried out to data, realize to the real-time control of power distribution network and
Operation.
Power grid Wide Area Measurement System (WAMS) by phasor measurement unit, data concentrator and the monitoring electric power that forms of main website from
Dynamicization system.It is to monitor system with the whole network of new generation that synchronous phasor measurement unit (PMU) is basic constituent element, it is utilized
The synchronous acquisition of computer technology and Modern High-Speed digital communication network implementations whole network data records in real time, is remote real-time
It transmits and the real-time analysis of data is handled, it being capable of real-time monitoring the whole network dynamic.
Important substation and power plant have been respectively mounted synchronous phasor measuring device, phasor measurement in actual power distribution network
Unit dynamic data has become one of the key data source of dynamic real time data platform at electric power system dispatching center.Huge
Network and numerous phasor measurement unit equipment, so that the synchronized phasor data volume of real-time measurement is very big in whole network, this
Huge pressure and challenge are brought to communication and storage between phasor measurement unit and data concentrator.Therefore to the pressure of data
Contracting and packing, are capable of the data volume of significantly less transmission, improve communication efficiency.The sound assurance efficiently and accurately of WAMS system
Operation.Strong help is provided for the real-time monitoring and operation of power grid.
Quick and precisely transmitting data based on above-mentioned background, between phasor measurement unit, data concentrator and main website becomes
A problem to be solved.Existing data transmission method is that synchronized phasor data are measured to obtain by phasor measurement unit, so
It is transferred in data concentrator according to specification (GBT 26865.2-2011) in real time afterwards, then each node is summarized by data concentrator
Data are transmitted to main website.But since the whole network number of nodes is huge, in the speed (such as 100 frames are per second) and power distribution network of transmission rate
Most of real time data variations are relatively slow, therefore have a large amount of redundant data in transmission process, and transmission efficiency is low, brings logical
Believe that bandwidth pressure is big, occupies the disadvantages of excessive memory space, therefore to dynamic data compression transmission and realizes quick nondestructive solution
Pressure is the technology for being worth research.For the present invention exactly in line with this purpose, binding isotherm specification and experimental data propose one kind
New dynamic data compression, decompressing method.
Summary of the invention
Technical problem to be solved by the present invention lies in how under the premise of not influencing Wide Area Measurement System data precision,
Effective compression dynamic data, efficiency of transmission between raising phasor measurement unit, data concentrator and main website reach quick, high
The transmission purpose of effect.
The present invention is to solve above-mentioned technical problem by the following technical programs：
A kind of method that Wide Area Measurement System communication process dynamic data is compressed, decompressed, includes the following steps：
(1) phasor measurement unit acquire in real time synchronized phasor data, frequency offset, frequency change rate, analog quantity and
Switching value data；
(2) when transmitting, phasor measurement unit selects complete transformat to the data transmitted at whole moment second, transfers
Entire data frame is to data concentrator end, and phasor measurement unit is to the data progress compression processing in non-whole moment second transmission, transmission
Compressed data frames are to data concentrator end；
(3) when data concentrator end receives the data frame from phasor measurement unit, the data frame received is first determined whether
Type is complete data frame or compressed data frames, if complete data frame is then stored, is forwarded, if compressed data frames,
Then the compressing mark word according to corresponding to data content corresponding in compressed data frames, information and previous moment data in configuration frame
Frame solution extrudes complete data frame, then stores, forwards, and wherein complete data frame provides benchmark for subsequent compression data frame decompression
Value.
Further, phasor measurement unit carries out at compression the data in non-whole moment second transmission in the step (2)
Reason, the compression processing include DC_IDCODE compression, the compression of century second SOC and data content compression, the data content compression
It is described including phasor data compression, frequency offset compression, frequency change rate compression, analog quantity compression and switching value compression
The data content of non-whole moment second transmission includes the n synchronized phasor successively stored, a frequency offset, a frequency variation
Rate, m analog quantity and d switching value, described n, m, d are natural number, and d is 16 integral multiple.
Further, the DC_IDCODE compression process is that the DC_IDCODE of eight bytes is mapped to one by mapping table
The DC_IDCODE of byte；
Complete data frame is all made of to all whole moment second when the century second SOC compression, for changing in one second
Remainder data frame, since its century second, there is no variations, therefore the century second at whole moment second is all made of, for non-in one second
The data frame at whole moment second does not have to transmit century second data；
When the phasor data compresses, o phasor data compressing mark word is introduced in n phasor data, if n is 4
Integral multiple, then o is equal to n divided by 4；If the integral multiple of n non-4, o is equal to n divided by 4 roundings plus 1, each phasor data compression mark
The size of character learning is a byte, and first to fourth phasor point is successively stored behind first phasor data compressing mark word
The variable quantity of phasor not corresponding with last moment, every two bit are corresponding in turn to 1 in the phasor data compressing mark word
The variable quantity of phasor, then introduce second phasor data compressing mark word, behind successively store the 5th to the 8th phasor difference
The variable quantity of phasor corresponding with last moment, in second phasor data compressing mark word every two bit it is successively right
The variable quantity of 1 phasor is answered, and so on, until all phasor variable quantities and all phasor compressing mark words are successively lined up and deposit
It puts, when compressing framing, distributes corresponding memory space according to the size of phasor variable quantity, then use phasor data compressing mark word
To illustrate the byte-sized distributed to each phasor variable quantity；
When the frequency offset compression, frequency change rate compression and analog quantity are compressed, by frequency offset, one
A frequency change rate regards analog quantity as, shares (m+2) a analog quantity, and k analog quantity compression is introduced in (m+2) a analog quantity
Identifier word, if the integral multiple that (m+2) is 8, the number k of analog quantity compressing mark word is equal to (m+2) divided by 8, if (m+2) non-8
Integral multiple, then k is equal to (m+2) and is rounded plus 1 divided by 8, and the size of each analog quantity compressing mark word is a byte, is introduced
First analog quantity compressing mark word behind successively store that the first to the 8th analog quantity is corresponding with last moment respectively to be simulated
The variable quantity of amount, every 1 bit are corresponding in turn to 1 analog quantity variable quantity in first analog quantity compressing mark word, then
Introduce second analog quantity compressing mark word, behind successively store the variable quantity of the 9th to the 16th analog quantity, described second
Every 1 bit are corresponding in turn to the variable quantity of 1 analog quantity in analog quantity compressing mark word, and so on, until all analog quantitys
Compressing mark word and analog quantity variable quantity are successively lined up storage, when compressing framing, are distributed according to the size of analog quantity variable quantity
Corresponding memory space illustrates the byte of each analog quantity variable quantity distribution with the analog quantity compressing mark word of introducing
Size；
The switching value compression introduces an on-off state word compressing mark word, i.e., 1 is introduced before d switching value
The on-off state word compressing mark word of byte indicates the situation of change of d switching value, one of on-off state word pair
Answer 16 switching values, each in the on-off state word compressing mark word is 0 or 1, wherein indicating to change with 1, with 0 table
Show constant or indicate constant with 1,0 indicates variation, for the on-off state word of variation, just adds new on-off state word
It is transmitted into data frame, the on-off state word not changed does not transmit then.
Further, the compressed data frames that data concentrator termination receives in the step (3) are decompressed extensive accordingly
Multiple, decompression includes DC_IDCODE decompression, century second SOC decompression and data content decompression, and the data content decompression includes phasor
Data decompression, frequency offset decompression, frequency change rate decompression, analog quantity decompression and switching value decompression.
Further, when the DC_IDCODE is decompressed, data concentrator end reads DC_IDCODE packed field, passes through
Preset DC_IDCODE mapping table is searched, the complete DC_IDCODE of its first eight uncompressed byte is found, completes decompression；
Since the data frame at all whole moment second is complete data frame when the century second SOC decompression, for variation
Remaining compressed data frames in one second, century second, there is no variations, therefore according to the century of previous data frame second
SOC obtains the century second SOC of this compressed data frames；
Data concentrator end reads phasor data when the phasor data decompresses, and determines phasor number by configuring frame,
Calculate the number of phasor data compressing mark word according to phasor number, when decompression first reads first phasor data compressing mark
Then word is read according to corresponding phasor variable quantity byte number behind the judgement of the content of first phasor data compressing mark word
Corresponding phasor variable quantity data behind the phasor data compressing mark word, by being compared solution with the phasor at previous moment
Pressure, obtains complete phasor data, repeats the above steps, be successively read all phasor data compressing mark words, corresponding to decompress
Phasor, until all phasor datas decompression is completed, non-for phasor number 4 integral multiple, the last one phasor is compressed when decompression
Space bit is ignored in identifier word；
The analog quantity decompression procedure is：Analog quantity number is determined by configuring frame first, is calculated according to analog quantity number
The number of analog quantity compressing mark word out, when decompression, first read first analog quantity compressing mark word, according to first analog quantity
Compressing mark word content judges the analog quantity variable quantity byte count sizes arranged behind, then reads first character section analog quantity
Corresponding analog quantity variable quantity has been obtained by being compared decompression with the analog quantity at previous moment behind compressing mark word
Whole analog quantity, then second analog quantity compressing mark word is read, it repeats the above process, is successively read all analog quantity compression marks
Character learning, decompresses analog quantity accordingly, until all analog quantitys decompression is completed, when the integral multiple of analog quantity number non-8, when decompression
Space bit in the last one analog quantity compressing mark word is ignored；
The switching value decompression procedure is：Data concentrator end obtains switching value number, read switch amount by configuring frame
Status word compressing mark word obtains corresponding switching value situation of change, and in conjunction with the switching value data of last moment, decompression is recovered
Complete switching value.
Further, the data concentrator end is according to the Bits 6-4 corresponding data frame class of identification in frame synchronous byte
Type.
Further, in the frame synchronous byte of the complete data frame Bits 6-4 be 000, the compressed data frames
Bits 6-4 is 101 in frame synchronous byte.
It further, further include the mechanism of reissuing in the method, the mechanism of reissuing is terminated by comparing data concentrator
The time interval of the data frame twice received, if data-frame times interval is greater than 1/V twice, wherein V is data frame transfer rate,
The V is 10 frames/second, 25 frames/second, 50 frames/second or 100 frames/second, then it is assumed that a certain frame is lost at data concentrator end, counts at this time
Command frame just is sent to phasor measurement unit according to concentrator side, it is desirable that reissues the data frame at the moment, phasor measurement unit receives
When reissuing command frame, the data frame at this moment is soon sent to data concentrator.
Further, the 1/V is 10ms.
Further, the phasor measurement unit receives when reissuing command frame, and the phasor measurement unit is into data set
Device sends the complete data frame at the moment, and the data frame sent is the data frame of overall format, and format abides by specification completely
The data frame of GBT 26865.2-2011, the overall format provide for the decompression of the compressed data frames at non-whole moment second below
With reference to.
The present invention has the following advantages that compared with prior art：
The present invention is by research real-time dynamic data transmission protocol, by selecting different to the judgement of transmission data, classification
Transport-type, to improve message transmission rate in the case where meeting data transportation requirements, reduce volume of transmitted data.For whole
At moment second, we select partial data format to transmit, and for non-whole moment second, we select compressed data format to pass
It is defeated, i.e., it modifies to data frame format, reduces conceptual data amount.
The method of the present invention includes DC_IDCODE compressions, century second SOC compression, phasor data, analog quantity, frequency shift (FS)
The comparison transmission of amount, frequency change rate differential transmission and switching value, the DC_IDCODE compression, will by mapping relations
IDCODE is reduced to a byte by eight bytes；Phasor data, analog quantity, frequency offset, frequency change rate differential transmission will pass
Defeated measurement amount is substituted for the difference only transmitted between this moment measurement amount and a upper moment measured value, and then greatly reduces number
According to amount, so that the size of entire data frame significantly reduces.
In addition, in order to distinguish complete data frame and compressed data frames, using on the basis of GBT 26865.2-2011,
Bits 6~4 increase a kind of frame type newly in frame alignment word, and defining 101 is compressed data frames, in this way can clearly and completely
Data frame (000) distinguishes, and when data frame passes in data concentrator, we pass through the inspection to frame synchronous byte in data frame
It surveys, identifies the format of data frame, extrude compressed data frames by reading configuration frame and the data frame solution of last moment, and then also
Original is at the data frame for meeting transmission protocol (GBT 26865.2-2011), for upper level data concentrator application.
In Wide Area Measurement System, often data concentrator needs to collect the real-time synchronization phasor number of a large amount of system
According to, when synchronous phasor measuring device with higher transmission rate (such as 100 frames are per second) to data concentrator aggregated data when, to logical
The pressure of letter is often larger, or even will appear the loss of certain data frames.Therefore, what is be arranged in the present invention reissues mechanism effectively
The reliability for guaranteeing data transmission requires the mechanism of reissuing that can find data in time by setting data concentrator end initiative
The loss of frame timely reissues complete data frame by reissuing command frame requirement synchronous measuring apparatus end, in this way can in time by
The data of loss receive again.To realize efficient, quick, reliable data transmission.
Detailed description of the invention
Fig. 1 is the Wide Area Measurement System structural schematic diagram of the embodiment of the present invention；
Fig. 2 is the dynamic data compression of the embodiment of the present invention, the end PMU and the end PDC course of work schematic diagram in decompressing method；
Fig. 3 is the dynamic data compression of the embodiment of the present invention, PMU end data frame compression process schematic diagram in decompressing method；
Fig. 4 is that the dynamic data of the embodiment of the present invention compresses, the end PMU carries out DC_IDCODE compression and PDC in decompressing method
The IDCODE mapping relations that end is followed when being decompressed accordingly；
Fig. 5 is that the dynamic data of the embodiment of the present invention compresses, the end PMU carries out century second SOC compression process in decompressing method
Schematic diagram；
Fig. 6 is that the dynamic data of the embodiment of the present invention compresses, PMU end data content compression process is illustrated in decompressing method
Figure；
Fig. 7 is the dynamic data compression of the embodiment of the present invention, the end PMU phasor contraction principle schematic diagram in decompressing method；
Fig. 8 is the dynamic data compression of the embodiment of the present invention, the compression of the end PMU analog quantity and the end PDC mould in decompressing method
Analog quantity decomposition principle schematic diagram；
Fig. 9 is that the dynamic data of the embodiment of the present invention compresses, PMU end switch amount compression process principle is illustrated in decompressing method
Figure；
Figure 10 is that the dynamic data of the embodiment of the present invention compresses, the end PDC compressed data frames decompression procedure is shown in decompressing method
It is intended to；
Figure 11 is that the dynamic data of the embodiment of the present invention compresses, PDC end data content decompression procedure is illustrated in decompressing method
Figure.
Specific embodiment
It elaborates below to the embodiment of the present invention, the present embodiment carries out under the premise of the technical scheme of the present invention
Implement, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to following implementation
Example.
The structure of Wide Area Measurement System is as shown in Figure 1, distribution PDC connection main station system, distribution PDC contain route 1, route
2, route 3 ..., be sequentially connected on route 1 PMU device 11, PMU device 12 ..., PMU device 16, be sequentially connected PMU on route 2
Device 21, PMU device 22 ..., PMU device 26, and so on, have generally for the PMU quantity connected for a local PDC
Limit, will not be too many, is far less than 256.
A kind of Wide Area Measurement System communication process dynamic data compression of the present embodiment, the method specific steps decompressed are such as
Under：
(1) phasor measurement unit acquires the data such as synchronized phasor data, analog quantity, switching value in real time；
(2) when transmitting, phasor measurement unit selects complete transformat to the data transmitted at whole moment second, transfers
Entire data frame is to data concentrator end, and phasor measurement unit is to the data progress compression processing in non-whole moment second transmission, transmission
Compressed data frames are to data concentrator end；
(3) when data concentrator end does not receive a certain data frame, command frame just is sent to phasor measurement unit and requires phase
Phasor measurement unit reissues the complete data frame at this moment, when phasor measurement unit receive data concentrator end transmission reissue order
When frame, phasor measurement unit reissues the complete data frame for losing the moment；
(4) when data concentrator end receives the data frame from phasor measurement unit, the data frame received is first determined whether
For complete data frame or compressed data frames, if complete data frame is then stored, is forwarded, if compressed data frames, then basis
Information and previous moment data frame solution extrude storage, forwarding after complete data frame in compressing mark word, configuration frame.
Fig. 2 is the end PMU described in the present embodiment and the end PDC course of work schematic diagram, and the end PDC issues to the end PMU and " opens real-time
The command frame of data transmission ", the end PMU select to send complete data frame or compressed data frames according to transmission time, and PDC termination harvests
Entire data frame or compressed data frames carry out corresponding decompression procedure when PDC termination receives compressed data frames, by compressed data frames
Complete data frame is reverted to, when the end PDC does not receive a certain time data frame, just command frame is sent to the end PMU and requires its benefit
The complete data frame at this moment is sent out, PMU termination, which receives, reissues order, retransmits corresponding moment complete data frame, it is ensured that reissue
Mechanism advantage.
Wherein, the end PMU and the end PDC workflow block diagram are shown in Fig. 3.
Firstly, the end PMU obtains outgoing data, when starting transmission, judge whether outgoing data is whole moment second, if the whole second
Moment then forms complete data frame transmission, if being non-whole moment second, forms compressed data frames transmission；For the ease of having distinguished
Entire data frame and compressed data frames, on the basis of GBT 26865.2-2011, Bits 6~4 are increased newly in frame synchronous byte
A kind of frame type, defining 101 is compressed data frames, can clearly be distinguished in this way with complete data frame (000).
For non-whole moment second data compression when, according to data format, successively carry out DC_IDCODE compression, century second
SOC compression, phasor data compression, analog quantity compression, switching value compression, form compressed data frames, then send.
When the end PDC, which detects, loses a certain time data frame, is just sent to the end PMU and reissue command frame, PMU is just reissued at end
The complete data frame at this moment, repeats the above steps.
DC_IDCODE compression, the compression of century second SOC, phasor data compression, frequency offset pressure are described in detail separately below
Contracting and frequency change rate compression, analog quantity compression and switching value compression process.
(1) DC_IDCODE compresses：Due to the PMU limited amount that a PDC connects, can usually be indicated with a byte
All PMU devices under same PDC distribute a byte to the DC_IDCODE of each PMU device, can at most indicate 256 PMU
The DC_IDCODE of device.Therefore the data being present between local PDC and PMU are transmitted, in compressed data, by reflecting
The DC_IDCODE of eight complicated bytes is mapped to the DC_IDCODE of a byte by firing table, greatly reduces data transmission.When
When data are sent to local PDC, timely by searching for IDCODE mapping table, the DC_IDCODE of its eight bytes can be found.
DC_IDCODE mapping table as shown in figure 4, when PMU DC_IDCODE be respectively eight bytes 0GD0JBb1,
0GD0JBb2 ..., 0GD0JBb16, the PMU DC_IDCODE of eight bytes is distinguished the 0000 of one byte of boil down to by compressing
0001,0,000 0010 ..., when the decompression of the end 0,000 1111, PDC, carry out rapid decompression IDCODE by searching for IDCODE mapping table.
It should be pointed out that 0GD0JBb1,0GD0JBb2 mentioned above ..., 0GD0JBb16 be PMU device name
Claim, is not limited to above-mentioned name in practical application, and mapping relations are not limited only to above situation.
(2) century second SOC compression：4 bytes are defined to century second in GBT 26865.2-2011, due to the present embodiment
Complete data frame is all made of to all whole moment second, and for changing the remainder data frame in one second, do not have in century second
It changes, so the century second at whole moment second can be all made of.It is equal for the data frame at non-whole moment second in one second in this way
Without transmitting century second data, the transmission of redundant data is greatly reduced, efficiency of transmission is improved.
Fig. 5 is SOC compression process schematic diagram within 0 second moment to 1 second moment, wherein：
0 second moment, complete data frame is transmitted, the partial data frame structure includes：The frame alignment word of 2 bytes
(SYNC), the frame length (FRAMESIZE) of 2 bytes, the DC_IDCODE of 8 bytes, the century second (SOC) of 4 bytes, 4 bytes second
Verification and (CHK) of equal part (FRACSEC), the data content of 0 second moment transmission and 2 bytes, Middle Ages second (SOC) indicate
X X month X day X divides 0 second, the i.e. moment；The data content of transmission is respectively DATA1t0、DATA2t0、…、DATANt0。
0.01 second moment, transmitted data compressing frame, data frame structure at this time include：The frame alignment word of 2 bytes
(SYNC), the frame length (FRAMESIZE) of 2 bytes, the DC_IDCODE of 1 byte, the second equal part (FRACSEC) of 4 bytes, 0.01
The data content of moment second transmission and verification and (CHK) of 2 bytes, wherein the data content difference of 0.01 second moment transmission
For DATA1t0.01、DATA2t0.01、…、DATANt0.01。
The data frame structure of any moment in 0.02 second to 0.99 second is the data transmitted with 0.01 second moment, difference
Content is different.
1 second moment, complete data frame is transmitted, partial data frame structure at this time includes：The frame alignment word of 2 bytes
(SYNC), the frame length (FRAMESIZE) of 2 bytes, the DC_IDCODE of 8 bytes, the century second (SOC) of 4 bytes, 4 bytes second
Verification and (CHK) of equal part (FRACSEC), the data of 1 second moment transmission and 2 bytes, Middle Ages second (SOC) indicate X X
The X days moon, X divided 1 second, the i.e. moment；1 second moment data content of transmission is respectively DATA1t1、DATA2t1、…、DATANt1。
As can be seen that the data frame SOC changed in one second does not have since whole moment second takes complete data frame to transmit
It changes, therefore the compressed data frames in one second do not transmit SOC, in decompression with reference to the SOC of previous moment, decompresses rapidly
SOC data.
(3) data content compresses：Fig. 6 is non-whole moment second PMU end data content compression process schematic, in the non-whole second
It carves, compressed data frame structure includes：The frame alignment word (SYNC) of 2 bytes, the frame length (FRAMESIZE) of 2 bytes, 1 byte
DC_IDCODE, the second equal part (FRACSEC) of 4 bytes and the check code (CHK) of DATA1,2 bytes, wherein DATA1 be number
According to field 1.
Before compression, phasor, 12 byte including the status word (STAT), a 4 bytes of n successively stored in DATA1 are defined
Frequency departure (FREQ), 12 byte frequency change rate (DFREQ), m 2 byte analog quantitys and d 2 byte switching values,
In, n phasor be respectively the first phasor (PHASORS1), the second phasor (PHASORS 2) ..., the 4th phasor (PHASORS
4),…；M analog quantity be respectively the first analog quantity (ANALOG 1) ..., the 6th analog quantity (ANALOG 6), the 7th analog quantity
(ANALOG 7) ..., the 14th analog quantity (ANALOG 14) ...；D switching value is respectively first switch amount (DIGITAL
1) ..., sixteenmo pass amount (DIGITAL 16) ....
Phasor data compress when, introduce o phasor data compressing mark word, if n be 4 integral multiple, o equal to n divided by
4；If the integral multiple of n non-4, o is equal to n divided by 4 roundings plus 1, and first phasor compressing mark word is located at the first phasor
Before (PHASORS 1), the first phasor (PHASORS 1) variable quantity, are successively stored behind first phasor compressing mark word
Two phasors (PHASORS 2) variable quantity ..., the 4th phasor (PHASORS 4) variable quantity, and each phasor compressing mark word size is equal
For a byte, every two one phasor variable quantity of bit correspondences in each phasor compressing mark word, i.e. first phasor compression mark
In character learning first bit with the change of two of second bit composition the first phasor of transmission time PHASORS1 before and after corresponding
Change amount ..., the 7th bit with the variation of two of the 8th bit compositions transmission time the 4th phasor PHASORS 4 before and after corresponding
Amount, and so on, until all phasor variable quantities and all phasor compressing mark words sequence store, compress framing when, according to will
The phasor and last moment phasor to be transmitted is compared, and distributes corresponding memory space according to the size of phasor variable quantity, so
Illustrate the byte-sized distributed to each phasor variable quantity, each phasor compressing mark radical evidence with phasor compressing mark word afterwards
The content that its every two is bit successively stores the phasor variable quantity of 4-16 byte number behind.
The basic thought of phasor compression is that the phasor measurements to be transmitted and last moment phasor value are compared, according to
The size of its variable quantity carries out different compressions, Fig. 7 is the flow chart of phasor data compression, detail explanation phasor number
According to how according to compared with last moment phasor data.
As shown in fig. 7, indicating to use rectangular coordinate system for phasor data, each phasor data pending is divided into real part
And imaginary part, whereinIndicate trThe real part of n-th of phasor of moment,Indicate trThe imaginary part of n-th of phasor of moment, n-th
A phasor data pending isN >=0, the trFor non-whole moment second.In compression, to transmit speed
It spends for 100 frames/s, for the real part of a certain moment phasorImaginary partWhen its later moment in time phasorRelative toVariable quantityWhen both less than 7, it isNybble is respectively distributed, totally one byte.When later moment in time phasorPhase
ForVariable quantityWhen both less than 127, it isEach distribution
One byte, totally two bytes.When later moment in time phasorRelative to's
Variable quantity When both less than 2047, it isA nibble is respectively distributed, totally three words
Section.When later moment in time phasorRelative toVariable quantity When not being both less than 2047, it isTwo bytes are respectively distributed, totally four bytes.
When compressing framing, a phasor compressing mark byte respectively corresponds four phasor variable quantities, a phase
It measures and stores four phasor variable quantities behind compressing mark byte, all phasor variable quantities are successively lined up storage, end is less than
Four phasor variable quantities, space bit is meaningless in this phasor compressing mark byte, skips in decompression.Phasor data compression and phase
Amount compressing mark word corresponding relationship is shown in Table 1.
1 phasor data of table compresses table corresponding with phasor compressing mark word
Phasor compression factor, specific compression factor are calculated by taking 100 frames of transmission speed/s, duration 1 second, eight phasors as an example
It is shown in Table 2.
2 phasor compression factor of table
Table 3- table 4 is that phasor data compresses dynamic byte size in the compression of PMU end data in the present embodiment.With four phasors
For one group, four phasors are followed successively by：WithPressure
Byte count sizes shared by phasor data are shown in Table 3 before contracting, byte shared by all possible compression phasor data after phasor data compression
Number size is shown in Table 4.
Byte count sizes shared by phasor data before table 3 compresses
Byte count sizes shared by all possible compression phasor data after the compression of 4 phasor data of table
In power distribution network, when data frame transfer rate is very fast, analog quantity variation is usually smaller, and the thought of compression is similar to
Phasor value compression, and judge the size of measurement variation amount, to select different compressed format, similarly introduce analog quantity pressure
Contracting identifier word, and there is one corresponding bit to be used as compressing mark position, analog quantity compressing mark before each analog quantity
In word successively each bit be used to indicate the byte number distributed after corresponding analog quantity compression, to efficiently compress mould
Analog quantity data, we combine two analog quantitys, are formed as the real and imaginary parts of phasor, improve efficiency of transmission,
The analog quantity compressing mark word of one byte indicates the compression situation of eight analog quantitys.
Since frequency departure (FREQ), frequency change rate (DFREQ) are similar with analog data, by frequency departure
(FREQ), frequency change rate (DFREQ) also regards analog quantity as and analog quantity is handled together, to reduce data volume, improves transmission speed
Rate, such one shared (m+2) a analog quantity.In analog quantity compression, k analog quantity compression is introduced in (m+2) a analog quantity
Identifier word, if the integral multiple that (m+2) is 8, the number k of analog quantity compressing mark word is equal to (m+2) divided by 8, if (m+2) non-8
Integral multiple, then k be equal to (m+2) divided by 8 be rounded plus 1, with eight analog quantitys be one group, by frequency departure (FREQ), frequency become
Rate (DFREQ), the first analog quantity (ANALOG 1) ..., the 6th analog quantity (ANALOG6) compressed, each analog quantity pressure
Contracting identifier word size is a byte, when successively storing former and later two continuously transmitted after first analog quantity compressing mark word
Frequency departure (FREQ) variable quantity at quarter, frequency change rate (DFREQ) variable quantity, the first analog quantity (ANALOG 1) variation
Amount ..., the 6th analog quantity (ANALOG 6) variable quantity, each bit is corresponding in turn in first analog quantity compressing mark word
Frequency departure (FREQ) variable quantity, frequency change rate (DFREQ) variable quantity, the first analog quantity (ANALOG1) variable quantity ...,
Six analog quantitys (ANALOG 6) variable quantity, first analog quantity compressing mark radical according to each bit content behind according to
The analog quantity variable quantity of secondary storage 4-16 byte number.
When frequency departure (FREQ), frequency change rate (DFREQ), the first analog quantity (ANALOG 1) ..., the 6th analog quantity
Second analog quantity compressing mark word, second analog quantity compressing mark word of introducing are re-introduced into after the completion of (ANALOG 6) compression
Afterwards successively store the 7th analog quantity (ANALOG 7) variable quantity ..., the 14th analog quantity (ANALOG 14) variable quantity, second
In analog quantity compressing mark word each bit be corresponding in turn to the 7th analog quantity (ANALOG 7) ..., the 14th analog quantity
Variable quantity between (ANALOG 14) and the corresponding analog quantity of last moment, analog quantity compressing mark radical is according to each bit
The content of position successively stores the variable quantity of the compressed analog quantity of 4-16 byte number behind.
Frequency offset, frequency change rate and analog quantity compression are as shown in Figure 8 with decompression procedure：
By 100 frames of transmission speed/s, for duration 1 second, 0 second (whole moment second), complete data frame, the end PMU are transmitted
The analog quantity of measurement isThe amount of actual transmissions is PDC is solved in end
Pressure obtain analog quantity be
Equal transmitted data compressing frame of each moment between 0.01 second to 0.99 second (non-whole moment second), at 0.01 second
When, the analog quantity of the end PMU measurement isThe amount of actual transmissions is
The end PDC is by the analog quantity that decompression obtainsAnd so on, at 0.99 second, the end PMU was surveyed
The analog quantity of amount isThe amount of actual transmissions is
The end PDC is by the analog quantity that decompression obtains
1 second (whole moment second), complete data frame is transmitted, the analog quantity of the end PMU measurement is
The amount of actual transmissions isThe analog quantity that acquisition is decompressed in the end PDC is
When compressing framing, all analog quantity variable quantities and analog quantity compressing mark word are successively lined up storage.Work as end
When tail is less than eight analog quantity variable quantities, space bit is meaningless in this analog quantity compressing mark byte, skips in decompression.
When switching value is compressed, an on-off state word is indicated with 2 bytes in complete data frame, wherein according to state
An on-off state word known to Data Transport Protocol corresponds to 16 switching values in mark GB/T 26865.2-2011, usually exists
In power distribution network, switching value variation is slow, therefore in order to reduce the transmission of data, insertion switch amount status word compressing mark
Word increases the situation of change that a byte is used to indicate on-off state word that is, before switching value field.The on-off state
Word compressing mark word is located at before first switching value, each bit successively in the on-off state word compressing mark word
The situation of change of a corresponding on-off state word, the on-off state word compressing mark radical is according to the content in field at it
The on-off state word of all changes is successively stored afterwards.
Switching value compresses detailed process as shown in figure 9, for d switching value, first on-off state word (DIGITAL
1 to DIGITAL 16) ..., the situation of change difference of the d/16 on-off state word (DIGITAL d-16 to DIGITAL d)
First bit, bit ..., the d/16 bit in corresponding on-off state word compressing mark word, such as first switching value
Status word next moment there is no variation, then by on-off state word compressing mark word the first bit be set as
0, use 0 indicate first on-off state word there is no variation, and so on, the variation feelings of the d/16 on-off state word
Condition corresponds in on-off state word compressing mark word d/16bit, and such as the d/16 on-off state word occurs in subsequent time
Variation, then be set as 1 for the last one bit in on-off state word compressing mark word, the d/16 switching value indicated with 1
Status word changes, by all on-off state word situations of change respectively and in on-off state word compressing mark word
New on-off state word, for the on-off state word of variation, is just added in data frame and transmits, do not have by bit one-to-one correspondence
The on-off state word changed does not transmit then.
It should be noted that on-off state word situation of change corresponding to above-mentioned 0 or 1 be not it is unique, can also
To indicate that on-off state word changes with 0,1 indicates on-off state word, and there is no variations.
The PMU end data frame compression front and back data frame sign that table 5 to table 6 lists the present embodiment compares.With 8 phasors, 1
Illustrate data frame compression front and back comparison for a frequency offset, 1 frequency change rate, 6 analog quantitys, 16 switching values.
Table 5 is data frame before PMU side pressure contracts, and table 6 is data frame after the contracting of PMU side pressure.
Data frame before 5 PMU side pressure of table contracts
Data frame after the contracting of 6 PMU side pressure of table
It is opened with 8 phasors, 6 analog quantitys, 16 from table 5 and table 6 compressed data frames compression factor situation, table 5 can be obtained
For the amount of pass, complete data frame is formed, amounts to 80 bytes；Data frame forms situation after table 6 shows compression, amounts to 39 words
Section.It can obtain by comparing, data frame sign greatly reduces after compression.
The end PDC workflow is as shown in Figure 10, and specific step is as follows：
Decompression starts, and PDC reads configuration frame, obtains phasor, analog quantity, the number of switching value, then receives data frame,
DC_IDCODE mapping table is read after receiving data frame in the end PDC, decompresses for compressed data frames IDCODE, for the number received
According to frame, compressed data is judged whether it is according to Bits 6~4 in its frame synchronous byte, if compressed data, is then successively carried out
SOC decompression, data content decompression, obtain complete data frame, are stored, forwarded, if according to 6~4 Bits in frame synchronous byte
Position judges that it for complete data frame, is then stored, forwarded.
PDC end data content decompression process is as shown in figure 11 in the present embodiment, and specific steps include：
Decompression starts, and first determines whether data content (DATA) has decompressed, if decompression is completely, in storing data
Hold, if not decompressed, further judge whether phasor decompresses completion, if phasor does not decompress completion, reads phasor compression
Identifier word decompresses phasor data, judges whether phasor has decompressed again, repeat the above process, until phasor decompression is completed, phasor
Judge whether analog quantity has decompressed after the completion of decompression, if analog quantity has not decompressed, read analog quantity compressing mark word, solves
Pressing mold analog quantity, judges whether analog quantity decompresses completion again, repeats the above process, until analog quantity decompression is completed, works as analog quantity
Judge whether switching value has decompressed after the completion of decompression, if switching value has not decompressed, read switch amount status word compressing mark
Word, decompression restore switching value, judge whether switching value decompresses completion again, repeat the above process, until switching value decompression is completely,
PDC judges whether DATA decompresses completion again after switching value decompression is complete, repeats the above steps, until DATA decompression is completely,
The completely rear storage of DATA decompression, forwarding data content.
When PDC requires to reissue the command frame of a certain frame to PMU, extension Bits 15~13 is utilized in command field CMD
Retain command type (110).When PDC sends this order indicate that PMU is required to reissue a certain time data frame again.Bits 12~0
Position then shows the time of the data frame to be reissued.PMU receives this command frame, is first learnt according to command byte and reissues data frame, then
The data frame moment that supplement hair is known to according to Bits12~0, to send the complete data frame at this moment to PDC.The end PDC
It reissues the specific frame format of command frame and is shown in Table 7, it includes following field that command frame is reissued in table：Frame alignment word (SYNC), frame length
(FRAMESIZE), DC_IDCODE, second equal part (FRACSEC) and command byte (CMD), verification and (CRC16), the table are detailed
Illustrate to reissue the frame format and field definition of command frame.Wherein Bits 15~13 shows command frame to mend in command byte
Data frame is sent out, at the time of illustrating the data frame to be reissued by Bits 12~0.To which data concentrator (PDC) be effectively guaranteed
Data transmission credibility between synchronous phasor measuring device (PMU).
Table 7 reissues the format of command frame
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Made any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.
Claims (10)
1. a kind of method of Wide Area Measurement System communication process dynamic data compression, decompression, which is characterized in that including walking as follows
Suddenly：
(1) phasor measurement unit acquires synchronized phasor data, frequency offset, frequency change rate, analog quantity and switch in real time
Measure data；
(2) when transmitting, phasor measurement unit selects complete transformat to the data transmitted at whole moment second, transfers integer
According to frame to data concentrator end, phasor measurement unit carries out compression processing, transmission compression to the data in non-whole moment second transmission
Data frame is to data concentrator end；
(3) when data concentrator end receives the data frame from phasor measurement unit, the data frame type received is first determined whether
For complete data frame or compressed data frames, if complete data frame is then stored, is forwarded, if compressed data frames, then root
According to information and previous moment data frame solution in compressing mark word corresponding to data content corresponding in compressed data frames, configuration frame
Complete data frame is extruded, then stores, forward, wherein complete data frame provides a reference value for subsequent compression data frame decompression.
2. the method for a kind of Wide Area Measurement System communication process dynamic data compression as described in claim 1, decompression, feature
It is, phasor measurement unit carries out compression processing to the data in non-whole moment second transmission in the step (2), at the compression
Reason includes DC_IDCODE compression, the compression of century second SOC and data content compression, and the data content compression includes phasor data
Compression, frequency offset compression, frequency change rate compression, analog quantity compression and switching value compression, non-whole moment second pass
Defeated data content includes the n synchronized phasor successively stored, a frequency offset, a frequency change rate, m analog quantity
And d switching value, described n, m, d are natural number, and d is 16 integral multiple.
3. the method for a kind of Wide Area Measurement System communication process dynamic data compression as claimed in claim 2, decompression, feature
It is,
The DC_IDCODE compression process is the DC_ that the DC_IDCODE of eight bytes is mapped to a byte by mapping table
IDCODE；
Complete data frame is all made of to all whole moment second when the century second SOC compression, for its changed in one second
Remaining data frame since its century second, there is no variations, therefore is all made of the century second at whole moment second, for the non-whole second in one second
The data frame at moment does not have to transmit century second data；
When the phasor data compresses, o phasor data compressing mark word is introduced in n phasor data, if the multiple that n is 4
Number, then o is equal to n divided by 4；If the integral multiple of n non-4, o is equal to n divided by 4 roundings plus 1, each phasor data compressing mark word
Size be a byte, successively store behind first phasor data compressing mark word first to fourth phasor respectively with
The variable quantity of last moment corresponding phasor, every two bit are corresponding in turn to 1 phasor in the phasor data compressing mark word
Variable quantity, then introduce second phasor data compressing mark word, behind successively store the 5th to the 8th phasor respectively with it is upper
The variable quantity of one moment corresponding phasor, every two bit are corresponding in turn to 1 in second phasor data compressing mark word
The variable quantity of phasor, and so on, until all phasor variable quantities and all phasor compressing mark words are successively lined up storage, compress
When framing, corresponding memory space is distributed according to the size of phasor variable quantity, is then illustrated with phasor data compressing mark word
The byte-sized distributed to each phasor variable quantity；
When the frequency offset compression, frequency change rate compression and analog quantity are compressed, by a frequency offset, a frequency
Rate change rate regards analog quantity as, shares (m+2) a analog quantity, and k analog quantity compressing mark is introduced in (m+2) a analog quantity
Word, if the integral multiple that (m+2) is 8, the number k of analog quantity compressing mark word is equal to (m+2) divided by 8, if (m+2's) non-8 is whole
Multiple, then k is equal to (m+2) and is rounded plus 1 divided by 8, and the size of each analog quantity compressing mark word is a byte, and the of introducing
The first to the 8th analog quantity analog quantity corresponding with last moment respectively is successively stored behind one analog quantity compressing mark word
Variable quantity, every 1 bit are corresponding in turn to 1 analog quantity variable quantity in first analog quantity compressing mark word, then introduce
Second analog quantity compressing mark word, behind successively store the variable quantity of the 9th to the 16th analog quantity, second simulation
Every 1 bit are corresponding in turn to the variable quantity of 1 analog quantity in amount compressing mark word, and so on, until all analog quantitys are compressed
Identifier word and analog quantity variable quantity are successively lined up storage, when compressing framing, are distributed according to the size of analog quantity variable quantity corresponding
Memory space, illustrated with the analog quantity compressing mark word of introducing each analog quantity variable quantity distribution byte it is big
It is small；
The switching value compression introduces an on-off state word compressing mark word, i.e., 1 byte is introduced before d switching value
On-off state word compressing mark word indicate the situation of change of d switching value, one of on-off state word corresponds to
16 switching values, each in the on-off state word compressing mark word are 0 or 1, wherein indicating to change with 1, use 0 is indicated not
Become or indicate constant with 1,0 indicates variation, and for the on-off state word of variation, new on-off state word is just added to number
According to transmitting in frame, the on-off state word not changed is not transmitted then.
4. the method for a kind of Wide Area Measurement System communication process dynamic data compression according to claim 3, decompression, special
Sign is that the compressed data frames that data concentrator termination receives in the step (3) carry out corresponding decompression and restore, and decompression includes
DC_IDCODE decompression, century second SOC decompression and data content decompression, the data content decompression include phasor data decompression, frequency
Rate offset decompression, frequency change rate decompression, analog quantity decompression and switching value decompression.
5. the method for a kind of Wide Area Measurement System communication process dynamic data compression according to claim 4, decompression, special
Sign is,
When the DC_IDCODE is decompressed, data concentrator end reads DC_IDCODE packed field, by searching for preset DC_
IDCODE mapping table finds the complete DC_IDCODE of its first eight uncompressed byte, completes decompression；
Since the data frame at all whole moment second is complete data frame when the century second SOC decompression, for changing one
Remaining compressed data frames in second, century second, there is no variations, therefore according to the century of previous data frame second SOC, obtained
To the century second SOC of this compressed data frames；
Data concentrator end reads phasor data when the phasor data decompresses, and determines phasor number by configuring frame, according to
Phasor number calculates the number of phasor data compressing mark word, and when decompression first reads first phasor data compressing mark word,
According to corresponding phasor variable quantity byte number behind the judgement of the content of first phasor data compressing mark word, the phase is then read
Corresponding phasor variable quantity data behind data compression identifier word are measured, by being compared decompression with the phasor at previous moment,
Complete phasor data is obtained, is repeated the above steps, all phasor data compressing mark words is successively read, decompresses phase accordingly
Amount, until all phasor datas decompression is completed, non-for phasor number 4 integral multiple, the last one phasor compression mark when decompression
Space bit is ignored in character learning；
The analog quantity decompression procedure is：Analog quantity number is determined by configuring frame first, and depanning is calculated according to analog quantity number
The number of analog quantity compressing mark word, when decompression, first read first analog quantity compressing mark word, are compressed according to first analog quantity
Identifier word content judges the analog quantity variable quantity byte count sizes arranged behind, then reads the compression of first character section analog quantity
Corresponding analog quantity variable quantity behind identifier word is obtained complete by being compared decompression with the analog quantity at previous moment
Analog quantity, then second analog quantity compressing mark word is read, it repeats the above process, is successively read all analog quantity compressing marks
Word decompresses analog quantity accordingly, until all analog quantitys decompression is completed, when the integral multiple of analog quantity number non-8, when decompression most
Space bit in the latter analog quantity compressing mark word is ignored；
The switching value decompression procedure is：Data concentrator end obtains switching value number, read switch amount state by configuring frame
Word compressing mark word obtains corresponding switching value situation of change, and in conjunction with the switching value data of last moment, decompression recovers complete
Switching value.
6. the method for a kind of Wide Area Measurement System communication process dynamic data compression according to claim 1, decompression, special
Sign is that the data concentrator end is according to the Bits 6-4 corresponding data frame type of identification in frame synchronous byte.
7. the method for a kind of Wide Area Measurement System communication process dynamic data compression according to claim 6, decompression, special
Sign is that Bits 6-4 is 000 in the frame synchronous byte of the complete data frame, the frame synchronous byte of the compressed data frames
Middle Bits 6-4 are 101.
8. the method for a kind of Wide Area Measurement System communication process dynamic data compression according to claim 1, decompression, special
Sign is, further includes the mechanism of reissuing in the method, and the mechanism of reissuing receives twice by comparing data concentrator termination
The time interval of data frame, if data-frame times interval is greater than 1/V twice, wherein V is data frame transfer rate, and the V is 10
Frame/second, 25 frames/second, 50 frames/second or 100 frames/second, then it is assumed that a certain frame is lost at data concentrator end, at this time data concentrator end
Just command frame is sent to phasor measurement unit, it is desirable that reissue the data frame at the moment, phasor measurement unit, which receives, reissues command frame
When, the data frame at this moment is soon sent to data concentrator.
9. the method for a kind of Wide Area Measurement System communication process dynamic data compression according to claim 8, decompression, special
Sign is that the 1/V is 10ms.
10. the method for a kind of Wide Area Measurement System communication process dynamic data compression according to claim 8, decompression,
It is characterized in that, the phasor measurement unit receives when reissuing command frame, and the phasor measurement unit is sent to data concentrator should
The complete data frame at moment, the data frame sent are the data frame of overall format, and format abides by specification GBT completely
The data frame of 26865.2-2011, the overall format provide ginseng for the decompression of the compressed data frames at non-whole moment second below
It examines.
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| CN109523772A (en) * | 2018-12-29 | 2019-03-26 | 东莞钜威动力技术有限公司 | A kind of voltage data transmission method, device, terminal and storage medium |
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| CN110728834A (en) * | 2019-08-27 | 2020-01-24 | 国网辽宁省电力有限公司 | WAMS measurement data compression transmission method based on Beidou short message |
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