CN106027205A - Data processing method and dispatching communication method of electricity power network system - Google Patents
Data processing method and dispatching communication method of electricity power network system Download PDFInfo
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- CN106027205A CN106027205A CN201610359194.3A CN201610359194A CN106027205A CN 106027205 A CN106027205 A CN 106027205A CN 201610359194 A CN201610359194 A CN 201610359194A CN 106027205 A CN106027205 A CN 106027205A
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0222—Estimation of channel variability, e.g. coherence bandwidth, coherence time, fading frequency
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses a data processing method and a dispatching communication method of an electricity power network system, which are dominated by a PLC transceiver, and supplemented by another one which can be used as follows: independently and reliably receiving and sending digital information; in a process of mutual communication and information exchange of stations, performing estimation of PLC physical channels in relatively long time period, wherein estimation content comprises time varying severity level of channel performance variation and average communication capability; and thereby judging whether to perform switching between PLC and wireless communication during receiving and sending period or not according to a corresponding switching mechanism. The data processing method of the invention comprises a step of counting a character c with the highest frequency of occurrence in one frame of data and calculating an occurrence number m of the character c, a step of generating bit fields Bn of n bits, and a step of newly generating a compressed frame. With the methods provided by the invention, a communication system is enabled to acquire maximum digital bandwidth needed possibly in most of time range, and in a relatively severe environment, digital bandwidth requirement for most essential control and remote sensing and telemetry of an electricity power network is guaranteed.
Description
Technical field
The invention belongs to electric power network communication and technical field of data processing, be specifically related to a kind of electric power network system
Data process and scheduling communication method.
Background technology
Electric power network refers to the electrification of power supply network, and its final purpose is to realize reliable, safety, economy, the height of electrical network
Effect, environmental friendliness and the target of use safety.The realization of this target, except need the remote measurement of various advanced persons, remote sensing technology and
Control technology, whole system need to set up integrated two-way reliably, independent of the communication network of public network on the basis of.
At present, it is achieved the digital communication requirement of electric power network, mainly start with in terms of two, one be start from scratch foundation with
The power communication private network of public network isolation, a kind of is the communication means with the communication technology of certain maturation existing as transition.From
Perfect result is seen, grows out of nothing and sets up permanent perfect power communication private network, to set about as technical from optical fiber technology
Optimum selection.But froming the perspective of from cost, difficulty is very big, is difficult in a short time, so being typically regarded as long-term plan and target.And
Various countries typically all set about with prior art, set up cambic power communication private network.Such as, the electric power network of the U.S., with independence
Fixed radio communication technology be main body.
The electric power network technology starting of China is slightly later than industry advanced country.This causes necessarily setting up power communication private network
Difficulty.In order to realize electric power network as early as possible, need to use existing communication technology, set up the power communication private network independent of public network.
Imitation west is with fixed radio communication net for electric power network communication service, and it is no problem to say from technical standpoint, but one the biggest
Difficulty is, government resources regulation give each industry and the radio frequency resources of civil area distribution, set aside electric power electricity the most specially
The part of net application.The regulation changing national resources regulation is very difficult.
Although the Radio Resource regulation of China can not set aside electric power network digital communication with special frequency range, but has individual quilt
The frequency range being referred to as " 433MHz " can arbitrarily use.So-called 433MHz, is can be by all application at All Countries
The frequency range freely used.433 is the frequency resource scope referred to, and is in the frequency range of one fixed width near 433MHz,
It is available for any application without declaring free use.In China, this frequency range specifically refers to 470～510MHz frequency ranges.One
Typical example product such as A7139 rf chip, being designed in this frequency range certain mid frequency occupied bandwidth is
250KHz.The communication capacity maximum of such series products can only achieve 0.5Mbps.If it is considered that the complicated physical channel environment of reply
The coding that uses, compress technique, along with the increasing of communication distance, on 100～200 rice grain pattern communication distances, digital bandwidth can only be
About 50Kbps.Cannot be as the main product of electric power network digital communication.So, cambic electric power network communication network,
Need additionally to seek the starting point.
Power-line Carrier Technology in Low (PLC) is to lift because very large scale integration technology takes off at the beginning of the 80's of last century
Since the digital communication technology revolution risen, the technology that a newly-developed gets up and gazed at by various applications.It has several
The communication network that individual feature can set up industry various with the mankind easily and social activity matches.I.e. PLC technological maheup
Communication network, its physical channel is civilian power network, and in the society of today, civilian power network can be described as omnipresent
's.Therefore, the digital communications network constituted with PLC, almost can disregard at the cost set up on physical channel.So, PLC leads to
First letter technology is developed two applications: indoor broadband digital communication communicates with electric power network private network.
The historical reasons developed due to above-mentioned electric power network, PLC is used for power communication private network by domestic electrical industry
Extensively pay attention to.And PLC is for indoor (all application in terms of life particularly at home) wideband digital application, the most phase
Work as maturation.In terms of this respect, it appears that ripe PLC indoor digital broadband technology can be transplanted to electric power network the most easily and lead to
In letter application.But, both application of PLC, because its features, there is certain difference in the place of some keys.
In the house indoor application of PLC, communication distance is confined to the distance range of family's building, typically at 30 meters
Within.The frequency range shared by digital carrier signal being modulated on electric lines of force because all actual cause, need 2MHz with
On.Along with the increase of frequency, along the signal of electrical lead transmission, with the highest efficiency emission to surrounding volume, this is to letter
The transmission of breath is substantially a disadvantageous characteristic.Because signal energy is with the feature of the loss of wireless electromagnetic waveshape, not only frequency
The highest component of signal loss is the biggest, and the most remote loss of signal of transmission range is the biggest.The digital communication distance of electric power network,
More remote than the most indoor broadband digital communication distance, generally reach rice up to a hundred the most farther.This is electric power network to PLC technology
Communication service is again a unfavorable factor.
Summary of the invention
Goal of the invention: the present invention is directed to deficiency, the data proposing a kind of electric power network system process and scheduling communication method.
Technical scheme: the scheduling communication method of a kind of electric power network system of the present invention, comprises the steps:
(1) wireless channel of PLC channel and 433 frequency ranges is carried out channel estimation, according to two channel digitals of initial time
The measurement data of communication bandwidth determines the initialization communication mechanism of communication system of power grids website: 433 multiband wireless communications or PLC carry
Wave communication, wherein determines that the specific standards of communication system of power grids website initialization communication mechanism is as follows:
If A0 is ＞ M2, then make communication system of power grids website original execution PLC carrier communication；
If A0 is ＜ M1, then make communication system of power grids website original execution 433 multiband wireless communications；
If A0 >=M1 and B0 ＞ M1, then make communication system of power grids website original execution 433 multiband wireless communications；
If A0 >=M1 and B0≤M1, then make communication system of power grids website original execution PLC carrier communication；
Wherein: A0 and B0 is respectively initial time PLC channel and the digital communication bandwidth of 433 frequency range wireless channels, M1
The communication bandwidth applied about automatization and management for electric power network sets thresholding, and M2 is that electric power network is about automatic data logging and height
The communication bandwidth of level metrology applications sets thresholding；
(2) according to the measurement data of PLC channel digital communication bandwidth, the time-varying degree of a upper cycle PLC channel is determined: flat
Steady or violent, wherein determine that the measurement process of a upper cycle PLC channel time-varying degree is as follows:
First, according to the average number communication bandwidth of the below equation upper cycle PLC channel of calculating:
Wherein: Ai was the digital communication bandwidth of ith measurement moment PLC channel in a upper cycle, N is the measurement time in each cycle
Number and measurement interval be T, i be natural number and 1≤i≤N；
Then, approximate test difference σ about PLC channel digital communication bandwidth was calculated in a upper cycle according to below equation:
Finally, it is judged that whether approximate test difference σ is less than standard deviation threshold method: the most then judge to flatten during a upper cycle PLC channel
Surely；If it is not, then judge that a upper cycle PLC channel time-varying is violent；
(3) according to time-varying degree, the communication form of communication system of power grids website and two channel digitals of a upper cycle PLC channel
The measurement data of communication bandwidth, determines the communication mechanism of current period communication system of power grids website and performs switching, wherein determines current
The communication mechanism of cycle communication system of power grids website to perform the specific standards of switching as follows:
First, average number communication bandwidth and the average of 433 frequency range wireless channels of a cycle PLC channel are calculated
Word communication bandwidth；
If a upper cycle communication system of power grids website performs PLC carrier communication and PLC channel time-varying is steady, simultaneously≤M2 and ＞ M1
Or ＜ M1 and≤M1, then make the communication mechanism of current period communication system of power grids website switch to 433 multiband wireless communications；
If a upper cycle communication system of power grids website to perform 433 multiband wireless communications and PLC channel time-varying steady, simultaneously ＞ M3 or
Person≤M3 and ＜ M1, then make the communication mechanism of current period communication system of power grids website switch to PLC carrier communication；
If a upper cycle communication system of power grids website performs PLC carrier communication and PLC channel time-varying is violent, simultaneously≤M2, then make current
The communication mechanism of cycle communication system of power grids website switches to 433 multiband wireless communications；
If a upper cycle communication system of power grids website to perform 433 multiband wireless communications and PLC channel time-varying violent, simultaneously ＞ M2 or
Person≤M2 and less than M1, then make the communication mechanism of current period communication system of power grids website switch to PLC carrier communication；
Wherein: M1 is the electric power network communication bandwidth setting thresholding about automatization and management application, and M2 is that electric power network closes
Communication bandwidth in automatic data logging and senior metrology applications sets thresholding, and M3 is the electric power network communication about video surveillance applications
Bandwidth sets thresholding.
Further, average number communication bandwidth and 433 frequency ranges of a upper cycle PLC channel are calculated according to below equation
The average number communication bandwidth of wireless channel:
Wherein: in Ai and the Bi respectively upper cycle, the numeral of ith measurement moment PLC channel and 433 frequency range wireless channels is led to
Letter bandwidth, N be the pendulous frequency in each cycle and measurement interval be T, i be natural number and 1≤i≤N.
The invention also discloses the data processing method of a kind of electric power network system, comprise the steps:
(1) frame data n byte altogether is added up, find out the highest character c of the frequency of occurrences and calculate its number of times occurred
m；
(2) generate the bit field Bn of n bit, represent the feature of n byte, if certain byte is equal to relevant position in c then Bn
One, other positions reset, and last bit field is according to whole byte polishing；
(3) condensed frame c Bn Li Lj Lk... is regenerated；Li Lj Lk be original frame data remove all character c it
After remainder bytes order arrangement；
(4) calculate the length of condensed frame, if length is less than n, then returns and compress successfully.
Further, the significant bit in traversal Bn territory, if bit is 1, then corresponding character is c, if bit is 0,
Then take a character from remainder bytes arrangement.
A kind of electric power network communication system of the present invention, including transmitting terminal and receiving terminal, described transmitting terminal passes through electric power
Line carrier wave communicates to connect with described receiving terminal,
Described transmitting terminal includes that message sink coding module, described receiving terminal include stay of two nights decoder module；
Described message sink coding module includes:
One frame data n byte altogether is added up, finds out the highest character c of the frequency of occurrences and calculate its number of times occurred
The device of m；
Generate the bit field Bn of n bit, represent the feature of n byte, as certain byte is corresponding equal in c then Bn
Position one, other positions reset, and last bit field is according to the device of whole byte polishing；
Regenerate condensed frame c Bn Li Lj Lk...；Li Lj Lk is after original frame data removes all character c
The tactic device of remainder bytes；
Described stay of two nights decoder module includes the significant bit traveling through Bn territory, if bit is 1, then corresponding character is c, if
Bit is 0, then take the device of a character from remainder bytes arrangement.
Beneficial effect: due to the fact that and have employed reliable but fixed radio communication transceiver that digital bandwidth is narrower as band
Wide relatively big but physical channel performance time variation has the standby of the carrier communication transceiver of the biggest randomness and fluctuating quantity so that
Whole communication system can obtain the digital bandwidth that maximum possible needs, again more severe in most time range
Under environment, it is ensured that the most basic control of electric power network and the digital bandwidth demand of remote sensing remote measurement, technology maturation, reliable and and without greatly
Cost puts into.
Detailed description of the invention
Below in conjunction with specific embodiment, the invention will be further described:
First, a kind of digital communication apparatus improving electric power network communication reliability that the present embodiment uses, it is arranged at electrical network
Communication site, including: wireless communication transceiver, plc communication transceiver and controller；Wherein:
Wireless communication transceiver is for carrying out channel estimation to the wireless channel of 433 frequency ranges, wireless to measure 433 frequency ranges
The digital communication bandwidth of channel；Be controlled by controller simultaneously, according to the switching command of controller by 433 frequency ranges without
Line communication mechanism receives the information of other communication system of power grids websites transmission or sends information to other communication system of power grids websites；This enforcement
In mode, the rf chip that wireless communication transceiver uses model to be A7129 (Taiwan Sheng Ke electronics corporation).
PLC communication transceiver is connected with adjacent communication system of power grids website by electric lines of force, and it is for carrying out PLC channel
Letter
Road is estimated, to measure the digital communication bandwidth of PLC channel；It is controlled by controller simultaneously, refers to according to the switching of controller
Make and receive the information of adjacent communication system of power grids website transmission by PLC carrier communication mechanism or send to adjacent communication system of power grids website
Information；In present embodiment, PLC communication transceiver uses the OFDM of 2～10MHz to modulate transceiver.
Controller is for collecting 433 frequency range wireless channels and the digital communication bandwidth measurement data of PLC channel, and leads to
Cross computational analysis and determine the communication mechanism of each cycle communication system of power grids website, and then communicate to wireless communication transceiver or PLC
Transceiver sends switching command；In present embodiment, controller uses the MSP430 control chip of TI company.
The website that present embodiment communicates at Electrical net, will can independently execute two transmitting-receivings of communication task
Machine is arranged parallel.Two transceivers be respectively the domestic technique comparative maturity mentioned of top be positioned at 470～510MHz, bandwidth
The wireless communication transceiver of 250KHz, and communication bandwidth is positioned at the plc communication transceiver of 2～7MHz.The latter uses
The OFDM technology similar with indoor broadband PLC network.Two communication transceivers of each website (wireless and PLC carrier wave),
All can perform the digital communication task of electric power network independently.
Noticing, PLC transceiver under good conditions, can meet the numeral of the required speed of all electric power networks application
Communication bandwidth, maximum can reach more than 10Mbps.But it is in the case of time-varying is disturbed, and this performance can drastically decline.?
The basic demand (general 10Kbps) of electric power network digital communication possibly even cannot be met in the case of low.And fixed radio communication
Transceiver, ability of its transmission information is more stable, but the digital communication bandwidth of its maximum is limited, typical such as 50～
On 100Kbps(such as 200 rice grain pattern communication distance).
Between any two website set up communication connection beginning, the PLC transceiver between two websites to and transceiver
Right, carry out respective channel estimation simultaneously, confirm the most possible communication capacity and modulation parameter, and each currently may be used
Volume of transmitted data can be obtained；Concrete grammar is as follows:
Wireless subsystem sends numeral arrow according to mutually sending the known digital information specified according to certain industrial standard to the other side
Amount, according to the Given information received, recipient may determine that the quality (SNR) of information, and selects certain transmitting-receiving parameter, example
As data compression ratio, coded system and coding parameter (pattern of such as punchinging, interweave than and mode etc.), and with standard regulation side
Formula informs launch party；PLC receives and dispatches the channel estimation also carrying out carrier channel with principle of identity, judges to select except analyzing
State transmitting-receiving parameter, in addition it is also necessary to select CP length, tone map and/or bit loading table, receiver with reliable fashion
Inform launch party.Present embodiment sets execution of each cycle n times channel and estimates to measure, and measurement interval is T；
In present embodiment, communication system every T=2 second carries out the channel of a specification and estimates the number under configuration corresponding with estimation
Word communication bandwidth, often measuring is for N=300 time a cycle deciding whether to switch subsystem；Under so arranging, a cycle
Time span is 10 minutes.
At any time, two pairs of transceivers only have the digital communication task needed for a pair.Specifically by that transceiver
To performing communication task, a handover mechanism judge to determine.
In principle, wireless and PLC two also can carry out bidirectional transfer of information to transceiver simultaneously, two subsystems because of
Time physical channel all becomes bad, " with joint efforts " transmits simultaneously can increase overall capacity.But this design causes the most complicated flow
Control operation, and in the case of the digital bandwidth difference of two sub-system worked well is very big, actual benefit is the least.Therefore originally
Embodiment is it is not recommended that so perform.
After console for centralized control initiates the two-way communication between this two website of session establishment between two websites, two websites
Two communication subsystems (wireless and PLC) carry out the performance estimation of respective physical channel independently.According to result, handover mechanism
Determine that selecting the most a certain physical channel is the communication channel between two websites.
Noting: channel estimated both direction result, such as X website is sent out, and Y website is received, and Y website is sent out, X website
Receive.Wireless and PLC is respectively arranged with two such result, with less one for this kind of physical channel communication capacity at that time.If two
Individual direction application demand is asymmetric, it is further contemplated that details provides the results of property being available for handover mechanism as judgement.
The decision rule that channel sets up initialization dialogue is as follows:
If A0 is ＞ M2, then make communication system of power grids website original execution PLC carrier communication；
If A0 is ＜ M1, then make communication system of power grids website original execution 433 multiband wireless communications；
If A0 >=M1 and B0 ＞ M1, then make communication system of power grids website original execution 433 multiband wireless communications；
If A0 >=M1 and B0≤M1, then make communication system of power grids website original execution PLC carrier communication；
Wherein: A0 and B0 is respectively initial time PLC channel and the digital communication bandwidth of 433 frequency range wireless channels, M1
The communication bandwidth applied about automatization and management for electric power network sets thresholding, and M2 is that electric power network is about automatic data logging and height
The communication bandwidth of level metrology applications sets thresholding, and M3 is the electric power network communication bandwidth setting thresholding about video surveillance applications；
Present embodiment sets M1=20Kbps, and M2=50Kbps, M3=1Mbps apply numeral communication bandwidth as this three class
Thresholding corresponding to demand.
Judge the stability of PLC physical channel: when some performs communication task to system in two subsystems,
The physical channel performance of PLC can change because of various factors, or improve or become bad.Likely change the son performing communication task
System can improve communication capacity.This task is judged by handover mechanism.Judge have three parts, first part, it is judged that
The performance change of PLC physical channel is the most stable change, or violent fluctuations within a period of time.Second portion
Point, according to the change of wireless and two physical channel average behaviors of carrier wave in this period, decide whether to switch over
Judge.3rd part, handover mechanism belongs to stationarity or violent fluctuations according to the change of PLC physical channel,
And two channel communication abilities in this period, handover mechanism judge whether to switch between subsystem.
The time-varying judgement of stability of PLC physical channel, specifically judges that flow process is as follows:
First, according to the average number communication bandwidth of the below equation upper cycle PLC channel of calculating:
Wherein: Ai was the digital communication bandwidth of ith measurement moment PLC channel in a upper cycle, N is the measurement time in each cycle
Number and measurement interval be T, i be natural number and 1≤i≤N；
Then, approximate test difference σ about PLC channel digital communication bandwidth was calculated in a upper cycle according to below equation:
Finally, it is judged that whether approximate test difference σ is less than standard deviation threshold method: the most then judge to flatten during a upper cycle PLC channel
Surely；If it is not, then judge that a upper cycle PLC channel time-varying is violent；
Secondly, according to time-varying degree, the communication form of communication system of power grids website and two numbers of channel of a upper cycle PLC channel
The measurement data of word communication bandwidth, determines the communication mechanism of current period communication system of power grids website and performs switching, wherein determines and works as
The communication mechanism of front cycle communication system of power grids website to perform the specific standards of switching as follows:
First, average number communication bandwidth and the average of 433 frequency range wireless channels of a cycle PLC channel are calculated
Word communication bandwidth；
If a upper cycle communication system of power grids website performs PLC carrier communication and PLC channel time-varying is steady, simultaneously≤M2 and ＞ M1
Or ＜ M1 and≤M1, then make the communication mechanism of current period communication system of power grids website switch to 433 multiband wireless communications；
If a upper cycle communication system of power grids website to perform 433 multiband wireless communications and PLC channel time-varying steady, simultaneously ＞ M3 or
Person≤M3 and ＜ M1, then make the communication mechanism of current period communication system of power grids website switch to PLC carrier communication；
If a upper cycle communication system of power grids website performs PLC carrier communication and PLC channel time-varying is violent, simultaneously≤M2, then make current
The communication mechanism of cycle communication system of power grids website switches to 433 multiband wireless communications；
If a upper cycle communication system of power grids website to perform 433 multiband wireless communications and PLC channel time-varying violent, simultaneously ＞ M2 or
Person≤M2 and less than M1, then make the communication mechanism of current period communication system of power grids website switch to PLC carrier communication；
Wherein: M1 is the electric power network communication bandwidth setting thresholding about automatization and management application, and M2 is that electric power network closes
Communication bandwidth in automatic data logging and senior metrology applications sets thresholding, and M3 is the electric power network communication about video surveillance applications
Bandwidth sets thresholding.
Further, average number communication bandwidth and 433 frequency ranges of a upper cycle PLC channel are calculated according to below equation
The average number communication bandwidth of wireless channel:
Wherein: in Ai and the Bi respectively upper cycle, the numeral of ith measurement moment PLC channel and 433 frequency range wireless channels is led to
Letter bandwidth, N be the pendulous frequency in each cycle and measurement interval be T, i be natural number and 1≤i≤N.
The invention also discloses the data processing method of a kind of electric power network system, comprise the steps:
(1) frame data n byte altogether is added up, find out the highest character c of the frequency of occurrences and calculate its number of times occurred
m；
(2) generate the bit field Bn of n bit, represent the feature of n byte, if certain byte is equal to relevant position in c then Bn
One, other positions reset, and last bit field is according to whole byte polishing；
(3) condensed frame c Bn Li Lj Lk... is regenerated；Li Lj Lk be original frame data remove all character c it
After remainder bytes order arrangement；
(4) calculate the length of condensed frame, if length is less than n, then returns and compress successfully.
Further, the significant bit in traversal Bn territory, if bit is 1, then corresponding character is c, if bit is 0,
Then take a character from remainder bytes arrangement.
The electric power network communication system of above-mentioned a kind of data processing method, including transmitting terminal and receiving terminal, described sends out
Sending end is communicated to connect with described receiving terminal by power line carrier,
Described transmitting terminal includes that message sink coding module, described receiving terminal include stay of two nights decoder module；
Described message sink coding module includes:
One frame data n byte altogether is added up, finds out the highest character c of the frequency of occurrences and calculate its number of times occurred
The device of m；
Generate the bit field Bn of n bit, represent the feature of n byte, as certain byte is corresponding equal in c then Bn
Position one, other positions reset, and last bit field is according to the device of whole byte polishing；
Regenerate condensed frame c Bn Li Lj Lk...；Li Lj Lk is after original frame data removes all character c
The tactic device of remainder bytes；
Described stay of two nights decoder module includes the significant bit traveling through Bn territory, if bit is 1, then corresponding character is c, if
Bit is 0, then take the device of a character from remainder bytes arrangement.
Data processing method and the system of the present invention are made further by the embodiment below in conjunction with an electric power network system
Describe in detail:
The present embodiment is a kind of electric power network communication system, is mainly used in electronic meter reading, and this communication system utilizes power line carrier
The numeral of ammeter is sent to charging center, and when utilizing power line carrier communication, the general moment using electric lines of force zero crossing passes
Sending frame data, at present, bandwidth is narrow, and general every frame data are about ten bytes.This system includes transmitting terminal and reception
End, transmitting terminal is communicated to connect with receiving terminal by power line carrier, and transmitting terminal includes message sink coding module, and receiving terminal includes
Stay of two nights decoder module.
Transmitting terminal needs to send about three tariff period 00: 00-08: 00, and 08: 00-14: 00,14: 00-
The communication of 00: 00, when communicating these three tariff period at present, transmission is BCD code, and BCD code data are 00
00 08 00 08 00 14 00 14 00 00 00, transmitting terminal directly transmits the BCG code end of totally 12 bytes.
Using in the electric power network communication system of the present embodiment, the method for message sink coding is compressed comprising the following steps:
One frame data are added up by step one, most character c=00 occur.
Step 2, generates the bit field Bn of n=12 bit, and in frame data, the character position equal to c is bit field
Relevant position 1, such as following table:
After bit field expands to whole byte-aligned, data are D5 70
Step 3, generates condensed frame 00 D5 70 08 08 14 14, and wherein 08 08 14 14 is that primitive frame removes dropping character
Remainder bytes arrangement after 00.
Step 4, calculates a length of the 7 of condensed frame, less than primitive frame, compresses successfully, compression ratio 41.6%.
At transmitting terminal, if compressing unsuccessful, then select when sending data to send initial data, do not send compression number
According to.
At receiving terminal, during stay of two nights decoding contracting module decompression, travel through the significant bit in Bn territory, if bit is 1, the most right
Answering character is c, if bit is 0, then takes a character from remainder bytes arrangement.
In the present embodiment, in the message sink coding module of the receiving terminal in electric power network communication system, it is achieved compression algorithm
Effectiveness come from the redundancy feature of electric power network communication data, such as user's electricity according to electric power standard DL645 agreement by
Four rates composition, but actually used it is typically only 2 rates, other 2 rates are full 0s.
Three-phase real-time voltage 230V 228V 229V is transmitted by embodiment 2, message sink coding module and stay of two nights decoding
Module is reduced the staff and decompression procedure the most as follows:
Three-phase real-time voltage, 230V 228V 229V, BCD Frame 02 30 02 28 02 29, data 02 after compression
A8 30 28 29, compression ratio 16.7%.
Embodiment 2 to four rate real time electrical quantity total/point/peak/flat/paddy, 8758.65/0.00/7235.32/
1523.33/0.00 being transmitted, message sink coding module and stay of two nights decoder module are reduced the staff and decompression procedure the most as follows:
Four rate real time electrical quantity are total/point/peak/flat/paddy, and 8758.65/0.00/7235.32/1523.33/0.00,
BCD code Frame 00 87 58 65 00 00 00 00 00 72 35 32 00 15 23 33 00 00 00 00, compression
Rear data 00 E0 77 00 87 58 65 72 35 32 15 23 33, compression ratio 35%.
Due to the fact that have employed reliable but fixed radio communication transceiver that digital bandwidth is narrower as bandwidth relatively big but
Physical channel performance time variation has the standby of the carrier communication transceiver of the biggest randomness and fluctuating quantity so that whole communication
System can obtain, in most time range, the digital bandwidth that maximum possible needs, again at ratio under relatively rugged environment,
Ensure the most basic control of electric power network and the digital bandwidth demand of remote sensing remote measurement, technology maturation, reliable and and throw without big cost
Enter.
Claims (5)
1. the scheduling communication method of an electric power network system, it is characterised in that: comprise the steps:
(1) wireless channel of PLC channel and 433 frequency ranges is carried out channel estimation, according to two channel digitals of initial time
The measurement data of communication bandwidth determines the initialization communication mechanism of communication system of power grids website: 433 multiband wireless communications or PLC carry
Wave communication, wherein determines that the specific standards of communication system of power grids website initialization communication mechanism is as follows:
If A0 is ＞ M2, then make communication system of power grids website original execution PLC carrier communication；
If A0 is ＜ M1, then make communication system of power grids website original execution 433 multiband wireless communications；
If A0 >=M1 and B0 ＞ M1, then make communication system of power grids website original execution 433 multiband wireless communications；
If A0 >=M1 and B0≤M1, then make communication system of power grids website original execution PLC carrier communication；
Wherein: A0 and B0 is respectively initial time PLC channel and the digital communication bandwidth of 433 frequency range wireless channels, M1
The communication bandwidth applied about automatization and management for electric power network sets thresholding, and M2 is that electric power network is about automatic data logging and height
The communication bandwidth of level metrology applications sets thresholding；
(2) according to the measurement data of PLC channel digital communication bandwidth, the time-varying degree of a upper cycle PLC channel is determined: flat
Steady or violent, wherein determine that the measurement process of a upper cycle PLC channel time-varying degree is as follows:
First, according to the average number communication bandwidth of the below equation upper cycle PLC channel of calculating:
Wherein: Ai was the digital communication bandwidth of ith measurement moment PLC channel in a upper cycle, N is the measurement time in each cycle
Number and measurement interval be T, i be natural number and 1≤i≤N；
Then, approximate test difference σ about PLC channel digital communication bandwidth was calculated in a upper cycle according to below equation:
Finally, it is judged that whether approximate test difference σ is less than standard deviation threshold method: the most then judge to flatten during a upper cycle PLC channel
Surely；If it is not, then judge that a upper cycle PLC channel time-varying is violent；
(3) according to time-varying degree, the communication form of communication system of power grids website and two channel digitals of a upper cycle PLC channel
The measurement data of communication bandwidth, determines the communication mechanism of current period communication system of power grids website and performs switching, wherein determines current
The communication mechanism of cycle communication system of power grids website to perform the specific standards of switching as follows:
First, average number communication bandwidth and the average of 433 frequency range wireless channels of a cycle PLC channel are calculated
Word communication bandwidth；
If a upper cycle communication system of power grids website performs PLC carrier communication and PLC channel time-varying is steady, simultaneously≤M2 and ＞ M1
Or ＜ M1 and≤M1, then make the communication mechanism of current period communication system of power grids website switch to 433 multiband wireless communications；
If a upper cycle communication system of power grids website to perform 433 multiband wireless communications and PLC channel time-varying steady, simultaneously ＞ M3 or
Person≤M3 and ＜ M1, then make the communication mechanism of current period communication system of power grids website switch to PLC carrier communication；
If a upper cycle communication system of power grids website performs PLC carrier communication and PLC channel time-varying is violent, simultaneously≤M2, then make current
The communication mechanism of cycle communication system of power grids website switches to 433 multiband wireless communications；
If a upper cycle communication system of power grids website to perform 433 multiband wireless communications and PLC channel time-varying violent, simultaneously ＞ M2 or
Person≤M2 and less than M1, then make the communication mechanism of current period communication system of power grids website switch to PLC carrier communication；
Wherein: M1 is the electric power network communication bandwidth setting thresholding about automatization and management application, and M2 is that electric power network closes
Communication bandwidth in automatic data logging and senior metrology applications sets thresholding, and M3 is the electric power network communication about video surveillance applications
Bandwidth sets thresholding.
The scheduling communication method of a kind of electric power network system the most according to claim 1, it is characterised in that: according to following public affairs
The average number communication bandwidth of the formula upper cycle PLC channel of calculating and the average number communication bandwidth of 433 frequency range wireless channels:
Wherein: in Ai and the Bi respectively upper cycle, the numeral of ith measurement moment PLC channel and 433 frequency range wireless channels is led to
Letter bandwidth, N be the pendulous frequency in each cycle and measurement interval be T, i be natural number and 1≤i≤N.
3. the data processing method of an electric power network system, it is characterised in that: comprise the steps:
(1) frame data n byte altogether is added up, find out the highest character c of the frequency of occurrences and calculate its number of times occurred
m；
(2) generate the bit field Bn of n bit, represent the feature of n byte, if certain byte is equal to relevant position in c then Bn
One, other positions reset, and last bit field is according to whole byte polishing；
(3) condensed frame c Bn Li Lj Lk... is regenerated；Li Lj Lk be original frame data remove all character c it
After remainder bytes order arrangement；
(4) calculate the length of condensed frame, if length is less than n, then returns and compress successfully.
The data processing method of a kind of electric power network system the most according to claim 3, it is characterised in that: traversal Bn territory
Significant bit, if bit is 1, then corresponding character is c, if bit is 0, then takes a character from remainder bytes arrangement.
5. an electric power network communication system, including transmitting terminal and receiving terminal, described transmitting terminal passes through power line carrier and institute
The receiving terminal communication connection stated, it is characterised in that:
Described transmitting terminal includes that message sink coding module, described receiving terminal include stay of two nights decoder module；
Described message sink coding module includes:
One frame data n byte altogether is added up, finds out the highest character c of the frequency of occurrences and calculate its number of times occurred
The device of m；
Generate the bit field Bn of n bit, represent the feature of n byte, as certain byte is corresponding equal in c then Bn
Position one, other positions reset, and last bit field is according to the device of whole byte polishing；
Regenerate condensed frame c Bn Li Lj Lk...；Li Lj Lk is after original frame data removes all character c
The tactic device of remainder bytes；
Described stay of two nights decoder module includes the significant bit traveling through Bn territory, if bit is 1, then corresponding character is c, if
Bit is 0, then take the device of a character from remainder bytes arrangement.
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