CN114629760B - Low-voltage station area characteristic current communication method based on frequency domain modulation - Google Patents
Low-voltage station area characteristic current communication method based on frequency domain modulation Download PDFInfo
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- CN114629760B CN114629760B CN202210359273.XA CN202210359273A CN114629760B CN 114629760 B CN114629760 B CN 114629760B CN 202210359273 A CN202210359273 A CN 202210359273A CN 114629760 B CN114629760 B CN 114629760B
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- characteristic current
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/04—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a low-voltage station area characteristic current communication method based on frequency domain modulation, which comprises the following steps: step 1, spreading and coding a communication sequence; step 2, performing OOK modulation on the square wave with the specific frequency according to the coded communication sequence to convert the square wave into characteristic current; step 3, switching the characteristic current into the power frequency current; step 4, intercepting the power frequency signal by using a preset window function at a receiving end and making difference in amplitude; step 5, intercepting the differential signal in the step 4 by using another preset window function, and obtaining the energy at the frequency point of the square wave signal by FFT; step 6, the window function in step 5 is stepped to obtain multiple times of frequency domain data, a group of data 5 bits is averaged and then is respectively related to spread spectrum codes of 1'b and 0'b in the sequence, and the correlation is compared and decoded, so that the characteristic current communication based on frequency domain modulation is completed. The method is based on frequency domain modulation for communication, and utilizes correlation for decoding without setting a threshold value, so that the detection precision of the current signal is improved.
Description
Technical Field
The invention relates to the technical field of low-voltage station area current communication, in particular to a low-voltage station area characteristic current communication method based on frequency domain modulation.
Background
The power line power frequency communication technology realizes data transmission by superposing a tiny distortion signal on power frequency voltage or current. The technology directly uses the power line as a communication medium without re-erecting a communication network channel, so that a large amount of manpower and material resources can be saved, but because the power line is not a special communication line, the transmission precision of power frequency communication data can be seriously affected by a complex and time-varying topological structure of a power distribution network, noise interference generated by various electric appliances and the like, and the technology is very important for the research of the power line communication technology.
At present, a great deal of research results are available for the detection algorithm of the power frequency received signals at home and abroad. The most common wavelet transform signal detection method is affected by wavelet base selection when time-frequency analysis is performed on the modulated signal. The conventional time domain detection method is mostly based on fixed threshold value for decoding, and the error is larger.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a low-voltage station area characteristic current communication method based on frequency domain modulation, which realizes power frequency communication of a power line based on frequency domain analysis of a receiving end, firstly suppresses harmonic waves by utilizing difference of time domain amplitude values of a front power frequency period and a rear power frequency period, and secondly decodes by utilizing correlation without setting a threshold value.
The aim of the invention can be achieved by the following technical scheme:
a low-voltage station area characteristic current communication method based on frequency domain modulation comprises the following steps:
step 1: performing spread spectrum coding on a communication sequence to be transmitted;
step 2: the method comprises the steps that OOK modulation is carried out on square waves with specific frequencies according to the coded communication sequence at a transmitting end, and the square waves are converted into characteristic current signals;
step 3: switching the characteristic current obtained in the step 2 into power frequency current;
step 4: intercepting a received power frequency signal by using a preset window function at a receiving end, and differencing the intercepted power frequency signal;
step 5: intercepting the power frequency signal with the amplitude subjected to the difference by using another preset window function, and performing FFT on the intercepted differential power frequency signal to obtain energy at a frequency point of the square wave signal;
step 6: repeating the window function in the step 5 and obtaining multiple times of frequency domain energy data, averaging a group of data 5 bits, respectively correlating the averaged data with spread spectrum codes of 1'b and 0'b in the sequence, and decoding by comparing the correlations, thus finishing the characteristic current communication based on frequency domain modulation.
Further, the square wave frequency in the step 2 may be selected to be 800hz to 2000hz.
Further, the window length of the window function in the step 4 is one power frequency period, and the sliding step is one power frequency period.
Further, the window length of the window function in the step 5 is 1bit characteristic current length, and the sliding step is 1bit characteristic current length divided by 5.
The beneficial effects of the invention are as follows: the characteristic current detection method based on the frequency domain analysis not only suppresses the power frequency period harmonic wave through the difference of adjacent power frequency period time domain amplitude values, but also encodes the sequence to be transmitted, decodes the sequence by utilizing the correlation, does not need to set a threshold value, and improves the power frequency signal detection precision.
Drawings
FIG. 1 is a schematic flow chart of the method of the present invention.
Fig. 2 is a schematic diagram of characteristic current switched at a transmitting end in an embodiment of the present invention.
Fig. 3 is a schematic diagram of a characteristic current after adjacent power frequency periods of a receiving end are differentiated in an embodiment of the present invention.
Fig. 4 is a schematic diagram of data at square wave frequency obtained in an embodiment of the present invention.
Fig. 5 is a correlation calculation result during decoding in the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1, a low-voltage station area characteristic current communication method based on frequency domain modulation comprises the following steps:
step 1: the 16bit communication sequence 1010101011101001' b to be transmitted is sequence coded, 1' b of 1bit is coded into 10101010' b, 0'b of 1bit is coded into 01010101' b, and 128 bits are added.
Step 2: and on a transmitting end, carrying out OOK modulation on a square wave signal with the frequency of 883Hz and the amplitude of 100mA according to the coded communication sequence, and converting the square wave signal into characteristic current with the 1bit duration of 60ms.
Step 3: and (2) switching the characteristic current obtained in the step (2) into a group of field-collected power frequency currents taking 20ms as a period, wherein an example diagram of the switched characteristic current theory is shown in fig. 2, the characteristic current is 10101010'b when 1' b is sent, the characteristic current is 01010101'b when 0'b is sent, and 7680ms is switched altogether.
Step 4: intercepting a power frequency signal by using a preset window function at a receiving end, and performing amplitude difference on the intercepted power frequency signal; the window length of the window function is one power frequency period, the sliding step is one power frequency period, as shown in fig. 3, which is an example diagram of a characteristic current theory obtained after the adjacent power frequency periods of the receiving end are differentiated, and partial power frequency noise and double characteristic current amplitude can be eliminated by the difference between the adjacent power frequency periods, but due to the error of the adjacent power frequency periods, fig. 3 shows irregular characteristic current containing power frequency noise.
Step 5: intercepting a power frequency signal with the amplitude value subjected to difference by using another preset window function, and performing FFT on the intercepted differential power frequency signal to acquire energy data at a frequency point of 883 Hz; the window length of the window function is 60ms and the sliding step is 12ms.
Step 6: after repeated acquisition of 883Hz frequency point data a plurality of times, an example diagram of 883Hz frequency point data theory is shown in fig. 4, which shows a plurality of 883Hz frequency point data obtained by step by the window function in step 5, each 5 representing 0'b or 1' b of 1bit, and each 10101010'b of 8 bits being decoded as 1' b of 1 bit; 01010101'b decodes every 8 bits into 0'b of 1 bit. Therefore, the frequency domain data is averaged every 5 bits, each 8 bits of the averaged data are respectively related to 10101010'b and 01010101' b, if the correlation with 10101010'b is stronger, the frequency domain data is decoded into 1' b, and if the correlation with 01010101'b is stronger, the frequency domain data is decoded into 0'b, and then the characteristic current communication based on the frequency domain modulation is completed; the calculation formula for the correlation is as follows:
where u is the average of the samples of 8 bits in succession,
,
if->
Then decoding is 1'b, otherwise decoding is 0'b.
The embodiment is decoded, the result is shown in figure 5,
representing the correlation of every 8bit sample points with 10101010' b,/i>
The correlation between each 8-bit sampling point and 01010101'b is shown, if the correlation between each bit and the former is strong, the decoding is 1' b, otherwise, the decoding is 0'b, and finally, the decoding is 1010101011101001' b, and the decoding result is consistent with the transmission sequence.
The above embodiments are illustrative of the specific embodiments of the present invention, and not restrictive, and various changes and modifications may be made by those skilled in the relevant art without departing from the spirit and scope of the invention, so that all such equivalent embodiments are intended to be within the scope of the invention.
Claims (1)
1. The low-voltage station area characteristic current communication method based on frequency domain modulation is characterized by comprising the following steps of:
step 1, spreading and coding a communication sequence to be transmitted;
step 2, square waves with a certain frequency are selected within the range of 800 Hz-2000 Hz, binary on-off keying OOK modulation is carried out on the square waves according to the coded communication sequence at the transmitting end, and the square waves are converted into characteristic currents;
step 3, switching the characteristic current obtained in the step 2 into power frequency current;
step 4, setting the window length of the window function as a power frequency period, sliding and stepping as a power frequency period, intercepting a received power frequency signal by using the window function at a receiving end, and differencing the amplitude of the intercepted power frequency signal;
step 5, setting the window length of a window function to be 1bit characteristic current length, dividing the sliding step by 5 by 1bit characteristic current length, intercepting the power frequency signal with the amplitude value subjected to difference by using the window function, and performing Fast Fourier Transform (FFT) on the intercepted difference power frequency signal to obtain the energy at a square wave frequency point;
and 6, repeating the window function in the step 5 and obtaining multiple frequency domain energy data, averaging a group of data 5 bits, and respectively correlating the averaged data segments with the spreading codes of 1'b and 0'b, wherein if the correlation with the spreading code of 1'b is stronger, the data is decoded into 1' b, and if the correlation with the spreading code of 0'b is stronger, the data is decoded into 0'b, so that the characteristic current communication based on frequency domain modulation is completed.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101980415A (en) * | 2010-10-09 | 2011-02-23 | 华北电力大学 | Method and system for implementing active uplink power line power-frequency communication |
| CN111487456A (en) * | 2020-03-27 | 2020-08-04 | 威胜信息技术股份有限公司 | Method and system for extracting characteristic signal from power frequency signal and file management method |
| CN112118057A (en) * | 2020-08-04 | 2020-12-22 | 全球能源互联网研究院有限公司 | Method and system for detecting received signal of power frequency communication system |
| CN113225280A (en) * | 2021-04-30 | 2021-08-06 | 威胜信息技术股份有限公司 | Distortion pulse current self-adaptive dynamic adjustment method in power frequency communication and self-adaptive dynamic adjustment sending device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101980415A (en) * | 2010-10-09 | 2011-02-23 | 华北电力大学 | Method and system for implementing active uplink power line power-frequency communication |
| CN111487456A (en) * | 2020-03-27 | 2020-08-04 | 威胜信息技术股份有限公司 | Method and system for extracting characteristic signal from power frequency signal and file management method |
| CN112118057A (en) * | 2020-08-04 | 2020-12-22 | 全球能源互联网研究院有限公司 | Method and system for detecting received signal of power frequency communication system |
| CN113225280A (en) * | 2021-04-30 | 2021-08-06 | 威胜信息技术股份有限公司 | Distortion pulse current self-adaptive dynamic adjustment method in power frequency communication and self-adaptive dynamic adjustment sending device |
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