CN110572183A - Low-voltage distribution network power line carrier communication performance quantitative test system - Google Patents
Low-voltage distribution network power line carrier communication performance quantitative test system Download PDFInfo
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- CN110572183A CN110572183A CN201910706245.9A CN201910706245A CN110572183A CN 110572183 A CN110572183 A CN 110572183A CN 201910706245 A CN201910706245 A CN 201910706245A CN 110572183 A CN110572183 A CN 110572183A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—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
- H04B3/542—Systems for transmission via power distribution lines the information being in digital form
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Abstract
The invention relates to a quantitative test system for power line carrier communication performance of a low-voltage distribution network, which comprises physical layer transparent access equipment, a main node shielding box, a sub-node shielding box, a main node carrier communication unit, a sub-node carrier communication unit, a signal generation unit, a signal analysis unit and a switch control unit, wherein the signal analysis unit comprises a frequency spectrograph, an oscilloscope and a first power divider, and the output end of the first power divider is respectively connected with the frequency spectrograph and the oscilloscope; the switch control unit comprises an adjustable attenuator and a radio frequency switch connected with the adjustable attenuator in parallel; the power line carrier communication performance quantitative test system further comprises a router and an industrial personal computer, wherein the router is controlled by the industrial personal computer and respectively controls other units of the test system in a wireless mode. Compared with the prior art, the invention has the advantages of more comprehensive test result, higher accuracy, higher equipment reaction speed during test, no need of wiring for building a system and relatively pure electromagnetic environment for the carrier communication unit.
Description
Technical Field
The invention relates to the field of electric information acquisition, in particular to a quantitative test system for power line carrier communication performance of a low-voltage distribution network.
Background
the medium and low voltage distribution network environment in China has the characteristics of centralized urban population and relatively dispersed rural population, and the physical topological structure mainly adopts a star-shaped and tree-shaped structure. The urban distribution network structure has the characteristics of large number of users in a single distribution area, complex environment, multiple branches, large attenuation and the like, the low-voltage distribution network is connected with numerous electric equipment, household appliances and industrial and commercial equipment, the power is supplied by basically adopting a switching power supply mode, and the conducted disturbance and radiation frequency bands are concentrated below 30MHz frequency and are superposed with the broadband carrier communication frequency band. High power equipment and frequency conversion equipment generate a large amount of harmonic waves and impulse noise when starting and stopping, and seriously pollute a broadband carrier communication channel. The low-voltage distribution network is powered by overhead lines, buried lines, pipeline lines and the like, and the line impedance is inconsistent; the impedance difference is large due to the change of the access load in each power utilization period, the signal attenuation changes randomly, and the channel quality is transient. Noise and impedance change in a practical use scene are random, and the fact that a real power distribution network is used for testing the broadband carrier technology is not feasible.
in order to better adapt to the actual environment of a field, the actual use scene can be simulated in a laboratory environment, the actual performance of carrier communication is effectively evaluated, and the method is used as a beneficial supplement outside a standard test method, thereby being beneficial to improving the detection capability of the laboratory and enabling the equipment to be more suitable for the actual use environment of the field.
at present, a test method for the communication performance of a power line carrier is mainly based on the technical standard Q/GDW 1374.3-2013 part 3 of the technical specification of a power consumer power utilization information acquisition system of the national grid company: technical specification of communication unit and Q/GDW1379.4-2013 "electricity consumption information collection system for electricity consumer check technical specification part 4: and the communication unit checks technical specifications, makes provisions for technical indexes such as output performance, transmitting performance, receiving performance, transmission performance and the like of the power line carrier, and provides a test scheme, so that the basic performance of carrier communication is ensured. However, the standard test method only tests the carrier communication performance in a determined environment, and when the standard test method is actually used on site, the carrier is affected by factors such as station topology, noise, attenuation and the like, the communication performance is often and rapidly reduced, and a product qualified in laboratory detection is often affected by various factors after being installed on site, so that acquisition failure or communication instability is caused, and the development of deep acquisition application work is greatly affected.
A broadband carrier test system is provided in the literature 'research on key technologies of smart grid power line broadband carrier communication test systems' (Wangchun, Lepisti, Huan bamboo, et al. power information and communication technology, 2018, v.16; No.177(05):86-92.), and the broadband carrier test system consists of a main node carrier communication unit, a sub-node carrier communication unit, a signal analyzer, a signal source, physical layer transparent access equipment and a switch matrix, wherein the main node carrier communication unit and the sub-node carrier communication unit are both accessed into corresponding shielding boxes.
the broadband carrier test system has the defects of low test result accuracy, low test response speed, complex construction and the like.
The invention patent with publication number CN107294563A discloses a shielding box, comprising: the power frequency input interface is connected with the network signal interface; the shielding box body comprises a network port serial port conversion module and a virtual equipment control device inside; the virtual device control apparatus includes: the functions of the virtual electric energy meter, the virtual concentrator, a communication module interface of the terminal, a power supply control unit and the like. The virtual electric energy meter is used for simulating and generating communication behaviors and service behaviors; the virtual concentrator is used for testing the interoperability of the broadband carrier unit and the application channel.
The broadband carrier unit in the shielding box is arranged in the shielding box, and a relatively pure electromagnetic environment is not provided for the broadband carrier unit.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a quantitative test system for the carrier communication performance of a power line of a low-voltage distribution network.
The purpose of the invention can be realized by the following technical scheme:
A low-voltage distribution network power line carrier communication performance quantitative test system comprises physical layer transparent access equipment, a main node shielding box, a sub-node shielding box, a main node carrier communication unit, a sub-node carrier communication unit, a signal generation unit, a signal analysis unit and a switch control unit, and is characterized in that the signal analysis unit comprises a frequency spectrograph, an oscilloscope and a first power divider, wherein the output end of the first power divider is respectively connected with the frequency spectrograph and the oscilloscope; the switch control unit comprises an adjustable attenuator and a radio frequency switch connected with the adjustable attenuator in parallel. A frequency spectrograph and an oscilloscope are used as a signal analysis unit, and the frequency spectrograph is used for frequency domain analysis and comprises power, frequency, distortion products and the like of a measurement signal; the oscilloscope can observe various waveform curves of different signal amplitudes along with time change, and can also be used for testing various electric quantities, such as voltage, current, frequency, phase difference, amplitude adjustment and the like, so that the test result is more comprehensive, and the accuracy is higher. The adjustable attenuator and the radio frequency switch connected with the adjustable attenuator in parallel are used as a switch control unit, so that the equipment response speed is higher during testing.
Furthermore, the power line carrier communication performance quantitative test system further comprises a router and an industrial personal computer, wherein the router is controlled by the industrial personal computer and respectively wirelessly controls the physical layer transparent access equipment, the main node shielding box, the sub-node shielding box, the signal generating unit and the signal analyzing unit. The control is convenient, and the system is built without wiring, so that the system is built more conveniently and quickly.
Further, the signal generating unit includes an arbitrary wave function source and a second power divider, an input end of the second power divider is connected to the switch control unit, and an output end of the second power divider is connected to the arbitrary wave function source and the first power divider respectively. The arbitrary wave function source can generate an arbitrary waveform, so that the signal generating unit has a wider application range. The second power divider feeds back output signals of the main node shielding box and the sub-node shielding box to the arbitrary wave function source through the switch control unit, and adjusts the output waveform of the arbitrary wave function source.
further, the master node shielding box comprises a master node carrier communication interface, and the sub-node shielding box comprises a sub-node carrier communication interface. The main node carrier communication interface and the main node carrier communication interface can be accessed into corresponding carrier communication units, and a relatively pure electromagnetic environment is provided for the carrier communication units.
Furthermore, the main node shielding box and the sub-node shielding box are respectively provided with a network signal interface, a broadband radio frequency signal interface and a power supply interface, and the model of the network signal interface is RJ 45.
Furthermore, the type of the broadband radio frequency signal interface is SMA.
further, the model of the power interface is DB 15.
further, the quantitative test comprises a main node communication performance test and a sub-node communication performance anti-attenuation test, and the main node communication performance test comprises the following steps:
S1: the method comprises the steps that a main node carrier communication unit is accessed into a main node shielding box;
S2: the industrial personal computer issues a test command;
s3: and obtaining a test result from the frequency spectrograph and the oscilloscope.
further, the child node communication performance anti-attenuation test comprises the following steps:
S1: the method comprises the steps that a main node carrier communication unit is accessed into a main node shielding box, and a sub-node carrier communication unit is accessed into a sub-node shielding box;
s2: the industrial personal computer issues a networking command, continuously reads the meter and counts the networking success rate;
S3: the channel environments with different attenuation amounts are realized by adjusting the attenuation amount of the adjustable attenuator, and meanwhile, specific test data are obtained by counting the networking success rate.
Compared with the prior art, the invention has the following advantages:
(1) the quantitative test system for the power line carrier communication performance of the low-voltage distribution network adopts the frequency spectrograph and the oscilloscope as the signal analysis unit, so that the test result is more comprehensive and the accuracy is higher. The adjustable attenuator and the radio frequency switch connected with the adjustable attenuator in parallel are used as a switch control unit, so that the equipment response speed is higher during testing.
(2) the system for quantitatively testing the carrier communication performance of the power line of the low-voltage distribution network further comprises a router and an industrial personal computer, each unit is controlled in a wireless mode, control is convenient, wiring is not needed when the system is built, and the system is built more conveniently and quickly.
(3) The shielding box is internally provided with a carrier communication interface connected with the carrier communication unit, so that a relatively pure electromagnetic environment is provided for the carrier communication unit.
Drawings
FIG. 1 is a schematic structural diagram of a low-voltage distribution network power line carrier communication performance quantitative test system of the invention;
FIG. 2 is a schematic structural diagram of a shielding box of a host node according to the present invention;
FIG. 3 is a schematic structural diagram of a sub-node shielding box according to the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments. The present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.
As shown in fig. 1, the present embodiment is a system for quantitatively testing power line carrier communication performance of a low-voltage distribution network, which includes a physical layer transparent access device, a master node shielding box (CCO shielding box), a sub-node shielding box (STA shielding box), a master node carrier communication unit (CCO), a sub-node carrier communication unit (STA), a signal generation unit, a signal analysis unit, a switch control unit, a router, and an industrial personal computer,
The main node carrier communication unit and the physical layer transparent access equipment are both connected into the main node shielding box, the sub-node carrier communication unit is connected into the sub-node shielding box, the switch control unit is respectively connected with the main node shielding box, the sub-node shielding box and the signal analysis unit, and the signal generation unit is connected into the main node shielding box. The router is controlled by the industrial personal computer and respectively controls the physical layer transparent access equipment, the main node shielding box, the sub-node shielding box, the signal generating unit and the signal analyzing unit in a wireless mode. The control is convenient, and the system is built without wiring, so that the system is built more conveniently and quickly.
Some parts of the quantitative test system are described in detail below:
1. signal analysis unit
The signal analysis unit comprises a frequency spectrograph, an oscilloscope and a first power divider, wherein the output end of the first power divider is connected with the frequency spectrograph and the oscilloscope respectively. The frequency spectrograph is used for frequency domain analysis, and comprises power, frequency, distortion products and the like of a measurement signal; the oscilloscope can observe various waveform curves of different signal amplitudes along with time change, and can also be used for testing various electric quantities, such as voltage, current, frequency, phase difference, amplitude adjustment and the like, so that the test result is more comprehensive, and the accuracy is higher.
2. Switch control unit
The switch control unit comprises an adjustable attenuator and a radio frequency switch connected with the adjustable attenuator in parallel. A spectrometer and an oscilloscope are used as a signal analysis unit. The adjustable attenuator and the radio frequency switch connected with the adjustable attenuator in parallel are used as a switch control unit, so that the equipment response speed is higher during testing.
3. Signal generating unit
The signal generating unit comprises an arbitrary wave function source and a second power divider, the input end of the second power divider is connected with the switch control unit, and the output end of the second power divider is respectively connected with the arbitrary wave function source and the first power divider. The arbitrary wave function source can generate an arbitrary waveform, so that the signal generating unit has a wider application range. The second power divider feeds back output signals of the main node shielding box and the sub-node shielding box to the arbitrary wave function source through the switch control unit, and adjusts output waves of the arbitrary wave function source.
4. Physical layer transparent injection device
physical layer transparent injection device: the method is used for simulating standard test equipment (a main node and a slave node), and has the functions of continuously generating test messages, adjusting frequency offset and the like.
5. Main node shielding box
As shown in fig. 2, the main node shield case includes: a network signal interface, a broadband radio frequency signal interface and a power interface (12V DC power supply); the interior of the shielding box body comprises a network port serial port conversion module, a virtual device control module, a main node carrier communication interface, a network signal transmission line, a broadband radio frequency signal transmission line and a power line.
The network signal transmission line is connected with the network port serial port conversion module and is respectively connected with the virtual equipment control module and the host node carrier communication interface through the network port serial port conversion module; the broadband radio frequency signal transmission line is connected with the main node carrier communication interface and is connected with the virtual equipment control module through the main node carrier communication interface; the power line is connected with the virtual equipment control module and is respectively connected with the network port serial port conversion equipment module and the host node carrier communication interface through the virtual equipment control module.
The virtual device control module includes: the system comprises a virtual electric energy meter, a virtual concentrator, a communication module interface of a terminal and a power supply control unit. The virtual electric energy meter is used for simulating and generating communication behaviors and service behaviors; a virtual concentrator for testing interoperability of the carrier communication unit and the application channel.
The main node carrier communication interface can be accessed to the main node carrier communication unit, and provides a relatively pure electromagnetic environment for the main node carrier communication unit.
the technical index requirements of the main node shielding box in this embodiment are as follows:
case size (W × D × H): 450X 550X 800 (mm);
A data interface: 1 RJ 45;
an RF interface: 2N/SMA;
Power frequency power supply interface: 1 aviation head with filtering/5A, model DB 15;
opening and closing modes: electric driving;
The structure is as follows: stainless steel material, built-in absorbing material.
6. Sub-node shielding box
as shown in fig. 3, the structure of the sub-node shielding box is substantially the same as that of the main node shielding box, and the difference is that the main node carrier communication interface is replaced with a sub-node carrier communication interface. The sub-node carrier communication interface is capable of accessing the sub-node carrier communication unit to provide a relatively clean electromagnetic environment for the sub-node carrier communication unit.
7. Quantitative test
The quantitative test comprises a main node communication performance test and a sub-node communication performance anti-attenuation test.
1) the main node communication performance test comprises the following steps:
s1: the method comprises the steps that a main node carrier communication unit is accessed into a main node shielding box;
S2: the industrial personal computer issues a test command;
S3: and obtaining a test result from the frequency spectrograph and the oscilloscope.
2) the anti-attenuation test of the communication performance of the child nodes comprises the following steps:
s1: the method comprises the steps that a main node carrier communication unit is accessed into a main node shielding box, and a sub-node carrier communication unit is accessed into a sub-node shielding box;
s2: the industrial personal computer issues a networking command, continuously reads the meter and counts the networking success rate;
S3: the channel environments with different attenuation amounts are realized by adjusting the attenuation amount of the adjustable attenuator, and meanwhile, specific test data are obtained by counting the networking success rate.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (9)
1. a low-voltage distribution network power line carrier communication performance quantitative test system comprises physical layer transparent access equipment, a main node shielding box, a sub-node shielding box, a main node carrier communication unit, a sub-node carrier communication unit, a signal generation unit, a signal analysis unit and a switch control unit, and is characterized in that the signal analysis unit comprises a frequency spectrograph, an oscilloscope and a first power divider, wherein the output end of the first power divider is respectively connected with the frequency spectrograph and the oscilloscope; the switch control unit comprises an adjustable attenuator and a radio frequency switch connected with the adjustable attenuator in parallel.
2. the system for quantitatively testing the carrier communication performance of the power lines of the low-voltage distribution network according to claim 1, wherein the system for quantitatively testing the carrier communication performance of the power lines further comprises a router and an industrial personal computer, wherein the router is controlled by the industrial personal computer and respectively wirelessly controls the physical layer transparent access device, the main node shielding box, the sub-node shielding box, the signal generating unit and the signal analyzing unit.
3. The system according to claim 1, wherein the signal generation unit comprises an arbitrary wave function source and a second power divider, an input end of the second power divider is connected to the switch control unit, and an output end of the second power divider is connected to the arbitrary wave function source and the first power divider respectively.
4. the system of claim 1, wherein the master node shielding box comprises a master node carrier communication interface, and the sub-node shielding box comprises a sub-node carrier communication interface.
5. The system of claim 1, wherein the main node shielding box and the sub-node shielding box are each provided with a network signal interface, a broadband radio frequency signal interface and a power supply interface, and the network signal interface is RJ 45.
6. The system of claim 5, wherein the broadband radio frequency signal interface is SMA in type.
7. The system for quantitatively testing the carrier communication performance of the power lines of the low-voltage distribution network as claimed in claim 5, wherein the model of the power interface is DB 15.
8. The system for quantitatively testing the power line carrier communication performance of the low-voltage distribution network according to claim 1, wherein the quantitative test comprises a main node communication performance test and a sub-node communication performance anti-attenuation test, and the main node communication performance test comprises the following steps:
S1: the method comprises the steps that a main node carrier communication unit is accessed into a main node shielding box;
S2: the industrial personal computer issues a test command;
S3: and obtaining a test result from the frequency spectrograph and the oscilloscope.
9. the system for quantitatively testing the power line carrier communication performance of the low-voltage distribution network according to claim 8, wherein the sub-node communication performance anti-attenuation test comprises the following steps:
S1: the method comprises the steps that a main node carrier communication unit is accessed into a main node shielding box, and a sub-node carrier communication unit is accessed into a sub-node shielding box;
s2: the industrial personal computer issues a networking command, continuously reads the meter and counts the networking success rate;
S3: the channel environments with different attenuation amounts are realized by adjusting the attenuation amount of the adjustable attenuator, and meanwhile, specific test data are obtained by counting the networking success rate.
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| CN111446987A (en) * | 2020-05-25 | 2020-07-24 | 国网上海市电力公司 | Power line carrier communication performance detection device and method thereof |
| CN112330949A (en) * | 2020-10-20 | 2021-02-05 | 国网北京市电力公司 | Test device, control method of test device, control device and processor |
| CN113507297A (en) * | 2021-05-26 | 2021-10-15 | 青岛鼎信通讯股份有限公司 | Test method and system for evaluating performance of HPLC communication unit |
| CN113691283A (en) * | 2021-09-18 | 2021-11-23 | 广东电网有限责任公司 | Carrier communication equipment performance test platform |
| CN113992238A (en) * | 2021-10-26 | 2022-01-28 | 广东电网有限责任公司 | Quantitative test analysis method, device and system for carrier communication performance |
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