CN104333399B - The system for testing low-voltage powerline carrier communication - Google Patents
The system for testing low-voltage powerline carrier communication Download PDFInfo
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- CN104333399B CN104333399B CN201410598543.8A CN201410598543A CN104333399B CN 104333399 B CN104333399 B CN 104333399B CN 201410598543 A CN201410598543 A CN 201410598543A CN 104333399 B CN104333399 B CN 104333399B
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- 238000012360 testing method Methods 0.000 title claims abstract description 59
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- 230000003321 amplification Effects 0.000 claims abstract description 11
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- 230000008878 coupling Effects 0.000 claims abstract description 9
- 238000010168 coupling process Methods 0.000 claims abstract description 9
- 238000005859 coupling reaction Methods 0.000 claims abstract description 9
- 230000006641 stabilisation Effects 0.000 claims description 5
- 238000011105 stabilization Methods 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 10
- 238000002474 experimental method Methods 0.000 description 7
- 238000002347 injection Methods 0.000 description 7
- 239000007924 injection Substances 0.000 description 7
- 238000009826 distribution Methods 0.000 description 6
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- 230000005611 electricity Effects 0.000 description 4
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- 230000005540 biological transmission Effects 0.000 description 3
- 238000010411 cooking Methods 0.000 description 3
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Abstract
The present invention provides a kind of system for testing low-voltage powerline carrier communication, including：Signal generator, for generating radiofrequency signal；Power amplifier is connected with the signal generator, for carrying out power amplification to the radiofrequency signal, obtains the radiofrequency signal after power amplification；First coupler is connected with the power amplifier, household electrical appliance, for the radiofrequency signal after power amplification to be coupled, and the radiofrequency signal after coupling is injected into household electrical appliance；Ac electric tester is connected with first coupler, for gathering the power and power frequency impedance of the household electrical appliance consumption；Oscillograph is connected by the second coupler with the household electrical appliance, for showing the radiofrequency signal for being injected into the household electrical appliance.The system realizes low-voltage powerline carrier communication pair and the test of household electrical appliance Electro Magnetic Compatibility.
Description
Technical field
The present invention is on technical field of power systems, especially with regard to the compatible technique of carrier communication and electric system, tool
Saying for body is a kind of system for testing low-voltage powerline carrier communication.
Background technology
Power line carrier communication is a kind of distinctive communication mode of electric system, is provided using the natural network of electric system
Data communication is realized in source, has many advantages, such as small investment, quick, synchronous with power grid construction.Voltage power-line carrier communication technology
It is a kind of special of the progress transmission such as data or voice using low-voltage distribution wire (380V/220V power lines) as information transmitting medium
Communication mode.At present, voltage power-line carrier communication technology has become the Primary communication of power user power consumption information acquisition system
One of mode.
Whether this communication mode of voltage power-line carrier communication technology can be to the power supply reliability and electric energy of electric system
Quality has an impact, and is current each electric company very concern.Specifically, it is gradually put into power information acquisition system
After operation, whether the working condition of household electrical appliance, which can be affected, is directly related to the popularization of low-voltage powerline carrier communication mode
And the construction of power information acquisition system.
Therefore, how according to voltage power-line carrier communication technology and the operation principle and technical characteristic of household electrical appliance,
Influence of the low-voltage powerline carrier communication to household electrical appliance is tested, is urgent technical problem to be solved in the field.
The content of the invention
In order to overcome the above-mentioned technical problems in the prior art, by analyzing carrier communication and household electrical appliance
Operation principle and technical characteristic, the present invention provides it is a kind of test low-voltage powerline carrier communication system, sent out by signal
The abstract carrier communication of raw device simulation, tests tested household electrical appliance, realize low-voltage powerline carrier communication pair with
The experiment test of household electrical appliance Electro Magnetic Compatibility subsequently can draw low-voltage powerline carrier communication to family expenses by analyzing oscillograph
The influence situation of electric appliance.
It is an object of the present invention to provide it is a kind of test low-voltage powerline carrier communication system, including：Signal generator,
For generating radiofrequency signal；Power amplifier is connected with the signal generator, for the radiofrequency signal progress
Power amplification obtains the radiofrequency signal after power amplification；First coupler is connected with the power amplifier, household electrical appliance
It connects, for the radiofrequency signal after power amplification to be coupled, and the radiofrequency signal after coupling is injected into household electrical appliance；Exchange
Electricity meter is connected with first coupler, for gathering the power of the household electrical appliance consumption and power frequency resistance
It is anti-；Oscillograph is connected by the second coupler with the household electrical appliance, and penetrating for the household electrical appliance is injected into for showing
Frequency signal.
Preferably, the system further includes：It is connected respectively with first coupler and ac electric tester
Line impedance stabilization net work LISN.
Preferably, the system further includes：The transformer being connected with the LISN.
Preferably, the transformer is isolation control transformer.
Preferably, first coupler is common mode coupler.
Preferably, first coupler is differential mode coupler.
Preferably, the household electrical appliance are Switching Power Supply class household electrical appliance and/or electric machinery household electrical appliance and/or resistance
Class household electrical appliance.
The beneficial effects of the present invention are by the operation principle and technology of analyzing carrier communication and household electrical appliance
Feature, it is proposed that a kind of system for testing low-voltage powerline carrier communication, the system realize low-voltage powerline carrier communication pair
With the experiment test of household electrical appliance Electro Magnetic Compatibility, the carrier communication being abstracted by signal generator simulation, to tested family expenses
Electric appliance is tested, and subsequently can draw influence situation of the low-voltage powerline carrier communication to household electrical appliance by analyzing oscillograph,
Data are provided for the popularization of low-voltage powerline carrier communication mode and the construction of power information acquisition system to support.
Above and other objects, features and advantages to allow the present invention can be clearer and more comprehensible, preferred embodiment cited below particularly,
And coordinate institute's accompanying drawings, it is described in detail below.
Description of the drawings
It in order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention, for those of ordinary skill in the art, without creative efforts, can be with
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is a kind of embodiment one of system for testing low-voltage powerline carrier communication provided in an embodiment of the present invention
Structure diagram；
Fig. 2 is the embodiment two in a kind of system for testing low-voltage powerline carrier communication provided in an embodiment of the present invention
Structure diagram；
Fig. 3 is the embodiment three in a kind of system for testing low-voltage powerline carrier communication provided in an embodiment of the present invention
Structure diagram；
Fig. 4 is the circuit diagram that low voltage power line carrier provided by the invention influences household electrical appliance common mode injection test；
Fig. 5 is the circuit diagram that low voltage power line carrier provided by the invention influences household electrical appliance differential mode injection test.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without making creative work
Embodiment belongs to the scope of protection of the invention.
In the prior art, whether this communication mode of voltage power-line carrier communication technology can to the power supply of electric system
It is had an impact by property and power quality, is current each electric company very concern.Specifically, gather system in power information
After system gradually puts into operation, whether the working condition of household electrical appliance, which can be affected, is directly related to low-voltage powerline carrier communication
The popularization of mode and the construction of power information acquisition system.
In view of the above-mentioned problems, work of the present invention by analyzing voltage power-line carrier communication technology and household electrical appliance is former
Reason and technical characteristic, it is proposed that a kind of system tested influence of the low-voltage powerline carrier communication to household electrical appliance.Tool
Body, reference《The EMC Requirements of household electrical appliance, electric tool and similar appliances》Middle part 2《Immunity to interference and GB/
T17626.6-2008 EMC tests and measurement technology》The conduction interference immunity experiment standard of middle radiofrequency field sensing, structure
The test system that household electrical appliance Electro Magnetic Compatibility influences.
Fig. 1 is a kind of embodiment one of system for testing low-voltage powerline carrier communication provided in an embodiment of the present invention
Structure diagram, as shown in Figure 1, the system specifically include：
Signal generator 100, for generating radiofrequency signal；
Power amplifier 200 is connected with the signal generator 100, for carrying out work(to the radiofrequency signal
Rate is amplified, and obtains the radiofrequency signal after power amplification；
First coupler 300 is connected with the power amplifier 200, household electrical appliance 400, for by power amplification
Radiofrequency signal afterwards is coupled, and the radiofrequency signal after coupling is injected into household electrical appliance 400；
Ac electric tester 500 is connected with first coupler 300, disappears for gathering the household electrical appliance
The power and power frequency impedance of consumption；
Oscillograph 600 is connected by the second coupler 700 with the household electrical appliance 400, and institute is injected into for showing
State the radiofrequency signal of household electrical appliance.
That is, in the system of test low-voltage powerline carrier communication provided by the invention, generated first by signal generator
Radiofrequency signal after being amplified by power amplifier, is injected into after the coupling of the first coupler in Device under test i.e. household electrical appliance.
Using the power and power frequency impedance of the test household electrical appliance consumption of ac electric tester, by the first coupler, oscillograph is utilized
Observation is actually implanted into the radiofrequency signal of power line, the impacted situation of observation household electrical appliance.In the present invention, the test system
In household electrical appliance include Switching Power Supply class household electrical appliance and/or electric machinery household electrical appliance and/or resistance class household electrical appliance.
Fig. 2 is the embodiment two in a kind of system for testing low-voltage powerline carrier communication provided in an embodiment of the present invention
Structure diagram, as shown in Figure 2, in embodiment two, the system further include respectively with first coupler 300 and hand over
The line impedance stabilization net work 800 that galvanic electricity tester 500 is connected.LISN (line impedance stabilization net work, Line
Impedance Stabilization Network) it is an important ancillary equipment in electric system in electromagnetic compatibility test.
It can isolate power grid interference, provide stable Impedance measurement.
Fig. 3 is the embodiment three in a kind of system for testing low-voltage powerline carrier communication provided in an embodiment of the present invention
Structure diagram, from the figure 3, it may be seen that in embodiment three, which further includes the transformer being connected with the LISN800
900.In a particular embodiment, transformer can be isolation control transformer.Isolated form controls transformer and LISN can be with
Ensure that the power supply of the tested household electrical appliance of supply is pure.
Fig. 4 is the circuit diagram that low voltage power line carrier provided by the invention influences household electrical appliance common mode injection test, by
Fig. 4 understand, in the specific embodiment, the first coupler be common mode CND couplers, the model Agilent of signal generator
81150A, the model CBA1G-018 of power amplifier, the model NDK-3000 of isolating transformer, no-load voltage ratio 1：1, LISN
Model NNB5, the model Agilent DS07104B of digital oscilloscope.Isolated form controls transformer and LISN that can ensure
The power supply of supply Device under test EUT is pure, and signal generator generates radiofrequency signal, after being amplified by power amplifier, warp
Common mode CDN couplers are crossed, are coupled on power line, are injected into Device under test EUT.It is surveyed using Multifunctional AC electricity meter
The power and power frequency impedance of EUT consumption are tried, by common mode CDN couplers, power line is actually implanted into using oscillograph observation
Radiofrequency signal, the impacted situation of observation Device under test.Wherein in the pilot system EUT include Switching Power Supply class household electrical appliance,
Electric machinery household electrical appliance and resistance class household electrical appliance.
Fig. 5 is the circuit diagram that low voltage power line carrier provided by the invention influences household electrical appliance differential mode injection test.By
Fig. 5 understand, in the specific embodiment, the first coupler be differential mode CND couplers, the model Agilent of signal generator
81150A, the model CBA1G-018 of power amplifier, the model NDK-3000 of isolating transformer, no-load voltage ratio 1：1, LISN
Model NNB5, the model Agilent DS07104B of digital oscilloscope.Isolated form controls transformer and LISN that can ensure
The power supply of supply Device under test EUT is pure, and signal generator generates radiofrequency signal, after being amplified by power amplifier, warp
Common mode CDN couplers are crossed, are coupled on power line, are injected into Device under test EUT.It is surveyed using Multifunctional AC electricity meter
The power and power frequency impedance of EUT consumption are tried, by differential mode CDN couplers, power line is actually implanted into using oscillograph observation
Radiofrequency signal, the impacted situation of observation Device under test.Wherein in the pilot system EUT include Switching Power Supply class household electrical appliance,
Electric machinery household electrical appliance and resistance class household electrical appliance.
In specific embodiment shown in Fig. 4, Fig. 5：
1st, test signal form
Carrier signal has a transmission form of common mode and differential mode simultaneously, but mainly using L N line differential couplings transmission
Form.There are Neusoft, ancient cooking vessel letter, lucky star dawn journey and Rui Sikang etc. in domestic primary carrier production producer, Neusoft and ancient cooking vessel courier's
Multi-carrier modulation scheme is frequency shift keying fsk, and the multi-carrier modulation scheme that lucky star dawn journey uses is phase-shift keying P SK.Low tension at present
The modulation system of power carrier communication mainly includes FSK, PSK and orthogonal frequency division multiplex OFDM technology, after ovennodulation, carrier signal
Frequency shift, but amplitude is constant.So the system mainly has following two forms using test signal form：
(1) unmodulated single frequency sinusoidal signal；
(2) true multicarrier communication signal.
2nd, test frequency scope and Frequency point
Low-voltage powerline carrier communication is divided into two kinds of narrowband and broadband.DL/T790.31-2001 is used《Distribution line carrier
Power distribution automation》Third portion：《Distribution line carrier request signal transmission》The 1st：《Frequency band and output level》, mesolow
Power distribution network carrier wave correlation standard, the frequency range of the low pressure narrowband power line carrier, PLC signal in China be 3kHz~
500kHz, the frequency range of low pressure broadband power multicarrier communication signal is 1MHz~20MHz.Due to the low pressure narrow band signal of mainstream
The frequency range for being the multicarrier communication signal of mainstream is 50kHz~500kHz, and the frequency test signal scope that this project is selected is
50kHz~20MHz can cover the frequency band of carrier communication.
On the selection of test frequency point, in 50kHz~500kHz frequency ranges, common carrier frequency is selected to click through
Row test.Since the centre carrier frequency that Neusoft and ancient cooking vessel are believed is respectively the load of 270kHz and 421kHz, lucky star dawn journey and Rui Sikang
Wave frequency rate point is 121kHz and 132kHz respectively.So in 50kHz~500kHz reference carrier frequencies, the test frequency point of selection
For 50kHz, 100kHz, 121kHz, 132kHz, 200kHz, 270kHz, 300kHz, 350kHz, 400kHz, 421kHz, 450kHz
And 500kHz.In 500kHz~20MHz frequency ranges, because when frequency is high, the distribution capacity of household electrical appliance is transmitted to carrier wave
Effect of signals is big, so, typical Frequency point is selected to test, 1MHz, 5MHz, 10MHz, 15MHz, 20MHz are chosen in experiment
Frequency point is tested.
3rd, signal amplitude
The experiment of GB/T17626.6-2008 electromagnetic compatibilities and the conduction interference immunity to interference of the radiofrequency field sensing of measurement technology
Test class specified in testing standard (stimulus voltage effective value) is respectively that grade 1 is 1V, and grade 2 is 3V, and grade 3 is
10V, class 4 are specific.Carrier wave letter is provided in DL/T698-1999 centralized meter reading system of low-voltage power consumers technical conditions standards
Number output level in 134dB μ V (quasi-peak value) below, i.e. 5V or so, but there are carrier communication equipment networking during, carrier wave letter
Number superposition and amplitude increased situation suddenly, so, in order to which result of the test is made to have more convincingness, test class uses GB/
Grade 2 and grade 3 in T17626.6-2008 standards that is, in carrier frequency in the range of 50kHz~500kHz, select GB/
Grade 3 in T17626.6-2008 standards is tested, and in the range of 500kHz~20MHz, selects GB/T17626.6-2008 marks
Grade 2 in standard is tested.
4th, impedance value
The part 2 of the EMC Requirements of GB4343.2-2009 household electrical appliance, electric tool and similar appliances：Anti-interference
The experiment of common mode Injection Current is provided in scale standard, source impedance is 150 Ω.For common mode injection testing system, source impedance
Using 150 Ω.
For differential mode injection testing system, the impedance that each access point of power line is measured using impedance test device is less than
50 Ω in order to which signal coupling is made to reach optimal, are considered the impedance value of each ancillary equipment, are more accorded with using the source impedance of 50 Ω
Close actual conditions.
5th, influence of the low-voltage powerline carrier communication to household electrical appliance is tested
In the specific embodiment shown in Fig. 4, Fig. 5, in 50kHz~20MHz frequency ranges, carrier communication is to household electric
The influence experimental test project of device is divided into two parts.Test household electric appliance operation consumption power, including active power, electric current,
Voltage, power factor；According to the 2nd of the EMC Requirements of GB4343.2-2009 household electrical appliance, electric tool and similar appliances the
Part：The performance criterion provided in immunity standard tests the function situation of household electric appliance operation, such as switch, heating, timing,
Indicator, audio, image etc. need other testing of electric motors axis Vibration Condition, motor speed situation to electric machinery household electrical appliance.
In conclusion a kind of system for testing low-voltage powerline carrier communication proposed by the present invention, is occurred first by signal
Device generates radiofrequency signal, and after amplifying by power amplifier, Device under test i.e. family expenses are injected into after the coupling of the first coupler
In electric appliance.Using the power and power frequency impedance of the test household electrical appliance consumption of ac electric tester, by the first coupler, utilize
Oscillograph observes the radiofrequency signal for being actually implanted into power line, the impacted situation of observation household electrical appliance.The system realizes low
Piezoelectricity powerline carrier communication pair and the experiment test of household electrical appliance Electro Magnetic Compatibility, obtained test result can be used for follow-up point
Analysis provides data and supports for the popularization of low-voltage powerline carrier communication mode and the construction of power information acquisition system.
Those skilled in the art will also be appreciated that the various functions that the embodiment of the present invention is listed are by hardware or soft
Part depends on the design requirement of specific application and whole system to realize.Those skilled in the art can be specific for each
Using, the function that the realization of various methods can be used described, but this realization is understood not to protect beyond the embodiment of the present invention
The scope of shield.
It applies specific embodiment in the present invention to be set forth the principle of the present invention and embodiment, above example
Explanation be only intended to help understand the present invention method and its core concept；Meanwhile for those of ordinary skill in the art,
Thought according to the invention, there will be changes in specific embodiments and applications, in conclusion in this specification
Appearance should not be construed as limiting the invention.
Claims (6)
1. a kind of system for testing low-voltage powerline carrier communication, it is characterized in that, the system includes：
Signal generator, for generating radiofrequency signal；
Power amplifier is connected with the signal generator, for carrying out power amplification to the radiofrequency signal, obtains
Radiofrequency signal after power amplification；
First coupler is connected with the power amplifier, household electrical appliance, for by the radiofrequency signal after power amplification into
Row coupling, and the radiofrequency signal after coupling is injected into household electrical appliance；
Ac electric tester is connected with first coupler, for gather the power of household electrical appliance consumption and
Power frequency impedance；
Oscillograph is connected by the second coupler with the household electrical appliance, and the household electrical appliance are injected into for showing
Radiofrequency signal；
Line impedance stabilization net work LISN is connected respectively with first coupler and ac electric tester.
2. system according to claim 1, it is characterized in that, the system further includes the change being connected with the LISN
Depressor.
3. system according to claim 2, it is characterized in that, the transformer is isolation control transformer.
4. according to the system described in claim 1 to 2 any one, it is characterized in that, first coupler couples for common mode
Device.
5. according to the system described in claim 1 to 2 any one, it is characterized in that, first coupler couples for differential mode
Device.
6. according to the system described in claim 1 to 2 any one, it is characterized in that, the household electrical appliance are Switching Power Supply class
Household electrical appliance and/or electric machinery household electrical appliance and/or resistance class household electrical appliance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410598543.8A CN104333399B (en) | 2014-10-30 | The system for testing low-voltage powerline carrier communication |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410598543.8A CN104333399B (en) | 2014-10-30 | The system for testing low-voltage powerline carrier communication |
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| Publication Number | Publication Date |
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| CN104333399A CN104333399A (en) | 2015-02-04 |
| CN104333399B true CN104333399B (en) | 2018-06-01 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199893A (en) * | 2013-04-03 | 2013-07-10 | 国家电网公司 | Low-voltage orthogonal frequency division multiplexing (OFDM) carrier physical layer communication performance detecting system |
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199893A (en) * | 2013-04-03 | 2013-07-10 | 国家电网公司 | Low-voltage orthogonal frequency division multiplexing (OFDM) carrier physical layer communication performance detecting system |
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