CN112511242A - Carrier detection method and system based on passive isolation - Google Patents
Carrier detection method and system based on passive isolation Download PDFInfo
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- CN112511242A CN112511242A CN202011272889.0A CN202011272889A CN112511242A CN 112511242 A CN112511242 A CN 112511242A CN 202011272889 A CN202011272889 A CN 202011272889A CN 112511242 A CN112511242 A CN 112511242A
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- 238000002955 isolation Methods 0.000 title claims abstract description 48
- 238000001514 detection method Methods 0.000 title claims abstract description 46
- 238000012360 testing method Methods 0.000 claims abstract description 34
- 238000012545 processing Methods 0.000 claims abstract description 28
- 238000012216 screening Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 12
- 230000005284 excitation Effects 0.000 claims abstract description 11
- 230000008030 elimination Effects 0.000 claims abstract description 9
- 238000003379 elimination reaction Methods 0.000 claims abstract description 9
- 238000004891 communication Methods 0.000 claims description 23
- 230000001360 synchronised effect Effects 0.000 claims description 10
- 239000000284 extract Substances 0.000 claims description 5
- 230000002159 abnormal effect Effects 0.000 claims 1
- 238000000605 extraction Methods 0.000 abstract description 4
- 238000013100 final test Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
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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
Abstract
The invention discloses a carrier detection method and a system based on passive isolation, wherein the method comprises the following steps: based on a high-frequency pulse excitation signal additionally input on a power line, carrying out voltage reduction processing on a three-phase voltage signal on the power line by using a first isolation transformer; carrying out frequency point screening on the three-phase voltage signals subjected to voltage reduction by using a band elimination filter to obtain power supply signals to be detected; carrying out secondary voltage reduction processing on the power supply signal to be tested by using a second isolation transformer to generate a final carrier test signal; and analyzing the carrier test signal to generate a related signal detection report. In the embodiment of the invention, the carrier signals collected on the power line are isolated twice, so that the accuracy and reliability in the carrier signal extraction process can be ensured.
Description
Technical Field
The invention relates to the technical field of carrier detection, in particular to a carrier detection method and system based on passive isolation.
Background
In many cases, low-voltage power line carrier communication (PLC) is a communication method in which a home power line is used as an information transmission medium and relevant information is transmitted to a user by a carrier. In recent years, in view of the characteristics of wide coverage, low cost, convenient access and the like of a carrier communication network, a carrier communication technology is widely applied to a plurality of fields of automatic meter reading of a remote power system, internet access, smart home and the like, and becomes a research hotspot of technical personnel at home and abroad. The invention solves the problem that how to accurately and reliably extract the carrier signal and verify the carrier signal in the early stage because the carrier signal is transmitted on a low-voltage power line and has large noise interference and strong electromagnetic interference.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a carrier detection method and a carrier detection system based on passive isolation.
In order to solve the above problem, the present invention provides a carrier detection method based on passive isolation, including:
based on a high-frequency pulse excitation signal additionally input on a power line, carrying out voltage reduction processing on a three-phase voltage signal on the power line by using a first isolation transformer;
carrying out frequency point screening on the three-phase voltage signals subjected to voltage reduction by using a band elimination filter to obtain power supply signals to be detected;
carrying out secondary voltage reduction processing on the power supply signal to be tested by using a second isolation transformer to generate a final carrier test signal;
and analyzing the carrier test signal to generate a related signal detection report.
Optionally, the frequency point screening is performed on the three-phase voltage signals subjected to voltage reduction processing by using the band elimination filter, and the obtaining of the power supply signals to be detected includes:
setting a frequency point threshold range, and extracting each frequency point signal falling in the frequency point threshold range from the three-phase voltage signals subjected to voltage reduction processing to form a power supply signal to be detected.
Optionally, the analyzing the carrier test signal and generating a related signal detection report includes:
resolving a synchronization signal from the carrier test signal based on a correlation value of a communication mode predefined on a power line, and judging whether the synchronization signal is consistent with the correlation value;
and when the synchronous signal is judged to be consistent with the correlation value, continuously acquiring a signal power value from the carrier test signal, and determining the operation condition of carrier communication based on the signal power value.
Optionally, after determining whether the synchronization signal is consistent with the correlation value, the method further includes:
and when the synchronous signal is judged to be inconsistent with the correlation value, generating alarm information of carrier signal detection abnormity.
In addition, an embodiment of the present invention further provides a carrier detection system based on passive isolation, where the system includes:
the early-stage voltage reduction module is used for carrying out voltage reduction processing on three-phase voltage signals on the power line by utilizing a first isolation transformer based on high-frequency pulse excitation signals additionally input on the power line;
the signal screening module is used for carrying out frequency point screening on the three-phase voltage signals subjected to voltage reduction processing by using the band elimination filter to obtain power supply signals to be tested;
the secondary voltage reduction module is used for carrying out secondary voltage reduction processing on the power supply signal to be tested by utilizing a second isolation transformer to generate a final carrier test signal;
and the signal analysis module is used for analyzing the carrier test signal and generating a related signal detection report.
Optionally, the signal screening module is configured to set a frequency point threshold range, and extract each frequency point signal falling within the frequency point threshold range from the three-phase voltage signals after voltage reduction processing to form a power signal to be detected.
Optionally, the signal analysis module is configured to decompose a synchronization signal from the carrier test signal based on a correlation value of a predefined communication mode on a power line, and determine whether the synchronization signal is consistent with the correlation value; and when the synchronous signal is judged to be consistent with the correlation value, continuously acquiring a signal power value from the carrier test signal, and determining the operation condition of carrier communication based on the signal power value.
Optionally, the signal analysis module is further configured to generate alarm information indicating that the carrier signal is detected abnormally when it is determined that the synchronization signal is inconsistent with the correlation value.
In the embodiment of the invention, the carrier signals collected on the power line are isolated twice, so that the accuracy and reliability in the carrier signal extraction process can be ensured; on the premise of meeting the detection requirement, the carrier signals collected on the power line are effectively filtered, so that the complexity in the carrier signal detection process can be reduced, and the signal detection time is reduced; by analyzing the final test signal and matching the power, the carrier communication state on the power line can be updated in real time, and a reference basis is provided for the overhaul work of field technicians.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a carrier detection method based on passive isolation in an embodiment of the present invention;
fig. 2 is a structural composition diagram of a carrier detection system based on passive isolation in an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Referring to fig. 1, fig. 1 is a schematic flowchart illustrating a carrier detection method based on passive isolation according to an embodiment of the present invention.
As shown in fig. 1, a carrier detection method based on passive isolation includes:
s101, based on a high-frequency pulse excitation signal additionally input on a power line, carrying out voltage reduction processing on a three-phase voltage signal on the power line by using a first isolation transformer;
in the embodiment of the invention, a field technician additionally inputs a very low high-frequency pulse excitation signal to a power line within a very short excitation time by adopting the existing high-frequency pulse field detector, the first isolation transformer adopts a Y/Y-shaped three-phase isolation transformer in a connection mode, and an electrostatic shielding layer is arranged between a primary coil and a secondary coil of the first isolation transformer, so that the current three-phase voltage signal on the power line can be acquired in real time, the influence of electromagnetic interference is reduced, and the accuracy of the acquired signal is ensured.
S102, carrying out frequency point screening on the three-phase voltage signals subjected to voltage reduction processing by using a band elimination filter to obtain power supply signals to be detected;
in the embodiment of the invention, a field technician sets the frequency point threshold range according to the detection requirement, and extracts each frequency point signal falling in the frequency point threshold range from the three-phase voltage signals subjected to voltage reduction processing to form the power supply signal to be detected.
S103, carrying out secondary voltage reduction processing on the power supply signal to be tested by using a second isolation transformer to generate a final carrier test signal;
in the embodiment of the invention, the second isolation transformer also adopts a Y/Y-shaped three-phase isolation transformer, and an electrostatic shielding layer is arranged between a primary coil and a secondary coil of the second isolation transformer and is used as a transition device for signal acquisition and signal detection, so that the result reliability in the signal detection process can be improved by carrying out secondary isolation processing on the power supply signal to be detected.
And S104, analyzing the carrier test signal to generate a related signal detection report.
In an embodiment of the present invention, a synchronization signal is decomposed from the carrier test signal based on a correlation value of a communication mode predefined on a power line, and whether the synchronization signal matches the correlation value is determined, and the determination result includes: when the synchronous signal is judged to be consistent with the relevant value, a signal power value is continuously obtained from the carrier test signal, and the operation condition of carrier communication is determined based on the signal power value; and when the synchronous signal is judged to be inconsistent with the correlation value, generating alarm information of carrier signal detection abnormity.
The embodiment of the invention can determine whether the finally acquired signal is a carrier signal or not by analyzing the prefix information and the matching degree of the prefix information and the correlation value, so as to feed back the carrier communication building state on the power line. In addition, by determining the signal power value of the carrier test signal, the previously formulated signal strength comparison table can be used to classify the power value of the carrier test signal, so as to determine the current communication quality of the carrier test signal.
In the embodiment of the invention, the carrier signals collected on the power line are isolated twice, so that the accuracy and reliability in the carrier signal extraction process can be ensured; on the premise of meeting the detection requirement, the carrier signals collected on the power line are effectively filtered, so that the complexity in the carrier signal detection process can be reduced, and the signal detection time is reduced; by analyzing the final test signal and matching the power, the carrier communication state on the power line can be updated in real time, and a reference basis is provided for the overhaul work of field technicians.
Examples
Referring to fig. 2, fig. 2 is a structural composition diagram of a carrier detection system based on passive isolation according to an embodiment of the present invention.
As shown in fig. 2, a carrier sensing system based on passive isolation, the system comprising:
the early-stage voltage reduction module 201 is configured to perform voltage reduction processing on a three-phase voltage signal on a power line by using a first isolation transformer based on a high-frequency pulse excitation signal additionally input on the power line;
in the embodiment of the invention, a field technician additionally inputs a very low high-frequency pulse excitation signal to a power line within a very short excitation time by adopting the existing high-frequency pulse field detector, the first isolation transformer adopts a Y/Y-shaped three-phase isolation transformer in a connection mode, and an electrostatic shielding layer is arranged between a primary coil and a secondary coil of the first isolation transformer, so that the current three-phase voltage signal on the power line can be acquired in real time, the influence of electromagnetic interference is reduced, and the accuracy of the acquired signal is ensured.
The signal screening module 202 is configured to perform frequency point screening on the three-phase voltage signal subjected to voltage reduction processing by using a band elimination filter to obtain a power supply signal to be tested;
in the embodiment of the invention, a field technician sets the frequency point threshold range according to the detection requirement, and extracts each frequency point signal falling in the frequency point threshold range from the three-phase voltage signals subjected to voltage reduction processing to form the power supply signal to be detected.
The secondary voltage reduction module 203 is configured to perform secondary voltage reduction processing on the power supply signal to be tested by using a second isolation transformer, so as to generate a final carrier test signal;
in the embodiment of the invention, the second isolation transformer also adopts a Y/Y-shaped three-phase isolation transformer, and an electrostatic shielding layer is arranged between a primary coil and a secondary coil of the second isolation transformer and is used as a transition device for signal acquisition and signal detection, so that the result reliability in the signal detection process can be improved by carrying out secondary isolation processing on the power supply signal to be detected.
The signal analyzing module 204 is configured to analyze the carrier test signal and generate a related signal detection report.
In an embodiment of the present invention, a synchronization signal is decomposed from the carrier test signal based on a correlation value of a communication mode predefined on a power line, and whether the synchronization signal matches the correlation value is determined, and the determination result includes: when the synchronous signal is judged to be consistent with the relevant value, a signal power value is continuously obtained from the carrier test signal, and the operation condition of carrier communication is determined based on the signal power value; and when the synchronous signal is judged to be inconsistent with the correlation value, generating alarm information of carrier signal detection abnormity.
The embodiment of the invention can determine whether the finally acquired signal is a carrier signal or not by analyzing the prefix information and the matching degree of the prefix information and the correlation value, so as to feed back the carrier communication building state on the power line. In addition, by determining the signal power value of the carrier test signal, the previously formulated signal strength comparison table can be used to classify the power value of the carrier test signal, so as to determine the current communication quality of the carrier test signal.
In the embodiment of the invention, the carrier signals collected on the power line are isolated twice, so that the accuracy and reliability in the carrier signal extraction process can be ensured; on the premise of meeting the detection requirement, the carrier signals collected on the power line are effectively filtered, so that the complexity in the carrier signal detection process can be reduced, and the signal detection time is reduced; by analyzing the final test signal and matching the power, the carrier communication state on the power line can be updated in real time, and a reference basis is provided for the overhaul work of field technicians.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer-readable storage medium, and the storage medium may include: read Only Memory (ROM), Random Access Memory (RAM), magnetic or optical disks, and the like.
The carrier detection method and system based on passive isolation provided by the embodiment of the present invention are described in detail above, a specific example is adopted herein to explain the principle and implementation of the present invention, and the description of the above embodiment is only used to help understanding the method and core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (8)
1. A carrier detection method based on passive isolation is characterized by comprising the following steps:
based on a high-frequency pulse excitation signal additionally input on a power line, carrying out voltage reduction processing on a three-phase voltage signal on the power line by using a first isolation transformer;
carrying out frequency point screening on the three-phase voltage signals subjected to voltage reduction by using a band elimination filter to obtain power supply signals to be detected;
carrying out secondary voltage reduction processing on the power supply signal to be tested by using a second isolation transformer to generate a final carrier test signal;
and analyzing the carrier test signal to generate a related signal detection report.
2. The carrier detection method based on passive isolation according to claim 1, wherein the frequency point screening of the three-phase voltage signal after voltage reduction processing by using the band elimination filter to obtain the power supply signal to be detected comprises:
setting a frequency point threshold range, and extracting each frequency point signal falling in the frequency point threshold range from the three-phase voltage signals subjected to voltage reduction processing to form a power supply signal to be detected.
3. The passive isolation-based carrier sensing method of claim 1, wherein the parsing the carrier test signal to generate the relevant signal sensing report comprises:
resolving a synchronization signal from the carrier test signal based on a correlation value of a communication mode predefined on a power line, and judging whether the synchronization signal is consistent with the correlation value;
and when the synchronous signal is judged to be consistent with the correlation value, continuously acquiring a signal power value from the carrier test signal, and determining the operation condition of carrier communication based on the signal power value.
4. The carrier sensing method based on passive isolation according to claim 3, further comprising, after determining whether the synchronization signal is consistent with the correlation value:
and when the synchronous signal is judged to be inconsistent with the correlation value, generating alarm information of carrier signal detection abnormity.
5. A passive isolation based carrier sensing system, the system comprising:
the early-stage voltage reduction module is used for carrying out voltage reduction processing on three-phase voltage signals on the power line by utilizing a first isolation transformer based on high-frequency pulse excitation signals additionally input on the power line;
the signal screening module is used for carrying out frequency point screening on the three-phase voltage signals subjected to voltage reduction processing by using the band elimination filter to obtain power supply signals to be tested;
the secondary voltage reduction module is used for carrying out secondary voltage reduction processing on the power supply signal to be tested by utilizing a second isolation transformer to generate a final carrier test signal;
and the signal analysis module is used for analyzing the carrier test signal and generating a related signal detection report.
6. The carrier detection system based on passive isolation according to claim 5, wherein the signal screening module is configured to set a frequency point threshold range, and extract each frequency point signal falling within the frequency point threshold range from the three-phase voltage signals after voltage reduction processing to form a power supply signal to be detected.
7. The system according to claim 5, wherein the signal analysis module is configured to decompose a synchronization signal from the carrier test signal based on a correlation value of a predefined communication mode on a power line, and determine whether the synchronization signal is consistent with the correlation value; and when the synchronous signal is judged to be consistent with the correlation value, continuously acquiring a signal power value from the carrier test signal, and determining the operation condition of carrier communication based on the signal power value.
8. The system according to claim 7, wherein the signal analysis module is further configured to generate an alarm message indicating that the detection of the carrier signal is abnormal when the synchronization signal is determined to be inconsistent with the correlation value.
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