CN111030730A - Low-voltage power line noise recording and injecting system - Google Patents
Low-voltage power line noise recording and injecting system Download PDFInfo
- Publication number
- CN111030730A CN111030730A CN201911232799.6A CN201911232799A CN111030730A CN 111030730 A CN111030730 A CN 111030730A CN 201911232799 A CN201911232799 A CN 201911232799A CN 111030730 A CN111030730 A CN 111030730A
- Authority
- CN
- China
- Prior art keywords
- power line
- power
- noise
- signal
- interference
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/56—Circuits for coupling, blocking, or by-passing of signals
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
The invention relates to a low-voltage power line noise recording and injecting system which comprises a power line interface, a power supply module, a power line coupling filter, a power amplifier, an arbitrary waveform generator and a power line communication signal detection and analyzer. The system restores a field noise signal through any signal generator in a laboratory by recording and storing the field noise so as to verify the working characteristics of the power line carrier communication module in a field noise environment; the high-voltage commercial power is isolated through the power line coupling filter, so that the measuring instrument is isolated from the strong power, the safety of measuring equipment is ensured, noise outside a test frequency band is filtered, the interference of useless signals is reduced, and the system provides a basis for the anti-interference test of the low-voltage carrier communication module.
Description
Technical Field
The invention relates to the technical field of power line carrier communication, in particular to a low-voltage power line noise recording and injecting system.
Background
The power line carrier is a specific and basic communication mode of a power system, harmonic interference has a determining function on the communication reliability of the power line carrier, and many household appliances are main sources of power grid harmonics due to the fact that the household appliances are provided with voltage-regulating rectifying devices. For example: television, light-adjusting lamp, temperature-adjusting cooker, video recorder, computer, etc. Although the capacity of each device is not large, the number of the devices in a certain cell is large, so that harmonic superposition interference is increased to a non-negligible level, and serious threats are generated on a power utilization safety, reliable power supply and power line meter reading network. Power line carrier communication is a technology for realizing information transmission by transmitting communication signals through a power line. Because the power line carrier communication is carried out on the power line, and because the power line communication under the field environment has the characteristics of severe environment, large time variation, serious interference and the like, standing waves, resonance and other phenomena are easily generated on the power line by signals, and the carrier signals are seriously attenuated when being transmitted on the power line. The attenuation of the power line carrier communication signal is easily affected by loads, the load difference of different areas is large, and the attenuation characteristic of the power line signal is correspondingly changed.
Most of the existing researches are carried out by recording field interference noise and replaying in a laboratory at a later stage by using general wave recording equipment. The method focuses on long-time wave recording, improvement of sampling rate and the like, or noise distribution research is carried out, and the correlation between interference noise and electric equipment is researched.
At present, a zero crossing point sending technology is largely used in a carrier communication scheme, the distribution rule of interference noise is fully utilized, adverse effects are reduced, and the technical scheme of communication has the time domain correlation characteristic of power frequency. The existing equipment is difficult to restore the real interference environment on site, and cannot comprehensively and effectively acquire and analyze the characteristics of the low-voltage power line. Therefore, it is desirable to invent a device for injecting a power line noise signal into a recording and playback apparatus.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a low-voltage power line noise recording and injecting system.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a low-voltage power line noise recording and injecting system comprises a power line interface, a power supply module, a power line coupling filter, a power amplifier, an arbitrary waveform generator and a power line communication signal detection and analyzer, wherein the output of the arbitrary waveform generator is connected to the power amplifier;
the power supply module obtains electric energy from the power line interface, converts power frequency commercial power into low-voltage direct current and supplies power for the power amplifier;
the power line interface provides an interface with the power line to inject noise interference signals into the power line through a coupling signal isolation device.
The power line coupling filter completes the isolation of strong current and weak current, overvoltage and overcurrent protection, high-pass or band-pass filtering of an interference output passband, and coupling a noise signal output by the power amplifier to the power line, so that the impedance matching of a power line transmission channel and an interference output end is realized;
the arbitrary waveform generator is used for generating a required noise interference signal;
the power amplifier completes power amplification of the noise interference signal;
the power line communication signal detection and analyzer is realized by adopting a power line communication signal frequency band spectrum detector, and the power line communication signal frequency band spectrum detector receives signals in a power line communication signal frequency band, performs power spectrum detection on the signals and feeds back detection results to a tester.
The invention has the advantages and positive effects that:
according to the low-voltage power line noise recording and injecting system, noise on a field power line is recorded and stored, a stored field noise signal is played back through an arbitrary waveform generator, and a high-frequency coupling output unit injects the noise signal into a low-voltage power supply testing system through gain adjustment, so that noise under the field environment and a noise environment required by testing are simulated and reproduced, and the testing of the communication performance of power line carrier communication equipment is realized.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
FIG. 2 is a schematic diagram of the low voltage power line noise recording of the present invention;
FIG. 3 is a schematic diagram of low voltage power line noise injection in accordance with the present invention;
FIG. 4 is a schematic diagram of an EMI filter of the present invention;
fig. 5 is a schematic diagram of the power line coupling filter of the present invention.
Detailed Description
The embodiments of the invention are described in further detail below with reference to the following figures:
the utility model provides a low pressure power line noise is recorded and injection system can realize recording the noise signal on the power line under site environment, restores it under the laboratory environment to at laboratory simulation site environment, realize site environment's restoration, test with the carrier communication equipment communication success rate to in the power grid, its innovation part lies in:
as shown in fig. 1, the system records and stores noise on a field power line, and plays back a noise signal through an arbitrary waveform generator, so as to simulate and reproduce noise in a field environment and a noise environment required by a test, thereby implementing a test on communication performance of a power line carrier communication device.
The system comprises a high-frequency coupling input unit, a level adjusting module, an A/D sampling module, an arbitrary waveform generator, a gain adjusting unit and a high-frequency coupling output unit. The system can realize the collection, storage, reduction and injection of noise in the field power line environment, so that the power line noise in the field environment can be reduced and injected in the laboratory environment and a required test noise signal can be generated. The high-frequency coupling unit realizes the separation of noise signals and the isolation of high-voltage commercial power, the attenuation of the commercial power with the frequency of 50Hz can reach more than 160dB, and the attenuation of high-frequency signals is less than 0.25 dB. The level adjusting module adjusts the amplitude of the separated noise signal to ensure that the amplitude does not exceed the adjusting range of the sampling module. Through the storage of sampling signals, analog signals can be restored and recovered through an arbitrary waveform generator, then the level of noise signals is adjusted through a gain adjusting unit, and the noise signals are injected into a power line in an experimental environment through a high-frequency coupling output unit.
As shown in fig. 2, the noise recording of the power line carrier communication realizes the collection and storage of the power line noise in the field environment through a single-machine system, when collecting the power line noise signal, the high-frequency coupling input unit separates the power line noise signal, and the noise amplitude is adjusted through the level adjustment module and then a/D sampling is performed. The main control chip is STM32, and the STM32 chip carries out analysis processes to the on-the-spot power line noise signal of collection to store the digital signal after gathering. The ADC module used in the system consists of a signal input interface, a level adjusting circuit and an AD9280 chip.
As shown in fig. 3, the noise interference injection for power line communication includes a power line interface, a power supply module, a power amplifier, a power line coupling filter, and an arbitrary signal generator. The power supply module supplies power to the noise signal generator and the power amplification module. The high-voltage commercial power is isolated through the power line coupling filter, the coupling from a field noise signal to the power line under an experimental environment and the coupling from a power line communication signal in a passband to the signal analyzer are completed, the strong current isolation between the power line and each module generating an interference signal is realized, the overvoltage and overcurrent protection is completed, and the impedance matching of the interference signal transmitted to the power line is completed.
As shown in fig. 4, the power line coupling filter is an EMI filter, and the EMI filter is used to filter unwanted noise on the power line, so as to create a relatively pure experimental environment. The differential mode inductor LDM and the differential mode capacitors CX1 and CX2 form a pi-type filter, so that the suppression and elimination of the differential mode noise are realized. Common mode inductor LCMAnd two common mode capacitors CY1、CY2A pair of LC low-pass filters is formed to realize the suppression and elimination of common mode noise. The common mode inductor is an inductor wound on a specific magnetic core, the number of turns of the two coils is the same, the winding directions are opposite, and when a common mode signal passes through the coils, a large inductive reactance is generated, so that the suppression of common mode noise is realized. The differential mode inductance is provided by the leakage inductance of the common mode inductance. Because the commercial power contains various high-frequency noises, the observation of the noise injection result is influenced, the EMI filter is adopted to filter the high-frequency noises, a relatively pure power supply environment is provided for the experiment, the EMI filter is used to filter interference signals in the commercial power, and the 50Hz pure commercial power is reserved to supply power for the experimental equipment.
As an embodiment, a power line coupling filter of an electromagnetic resistance capacitance combination shown in fig. 5 is used. But this high frequency coupling filter high frequency noise signal coupling to the power line to keep apart the high-pressure commercial power, in order to guarantee experimental facilities's safety. The electromagnetic coupling power line coupling filter is used, and proper inductance and capacitance values are selected to reduce heating caused by the resistance, so that the filter has the function of isolating 50Hz mains supply through noise signals. The electromagnetic coupling filter is used, so that heating caused by using a resistor is avoided, extra power consumption can be reduced, and the power use efficiency of the noise generating device is improved. Any signal generator can generate single-frequency signals with different frequencies of 40kHz, 50kHz, 70kHz and the like, the single-frequency signals are sent to the power line coupling filter through the power amplification module, and then the single-frequency signals are injected into the power line under the experimental environment. Since the 3 single-frequency signals are all in the passband of the power line coupling filter, these single-frequency interference noise signals can be injected into the power line to perform noise interference on the carrier communication device connected to the power line. The random signal waveform generator can also reproduce the field noise signals stored in the random signal waveform generator or randomly burst interference, and the passing frequency band range of the random signal waveform generator is adjusted by adjusting the parameters of the power line coupler, so that the injection of noise signals with different frequencies is realized.
The signal analyzer is used for detecting various noise injection conditions and communication signals on the medium power line channel and analyzing the influence of different noise injection environments on the comprehensive test of the broadband power line carrier communication. When the power of the single-frequency signal is sufficiently high, a communication receiver connected to a power line may be saturated and may not receive a communication signal correctly. When the noise signal needs to be injected into the power line, the stored field noise signal is injected into the power line through the arbitrary waveform signal generator and the high-frequency coupling filter. The method can effectively verify the sensitivity of the carrier communication equipment to noise and provide a theoretical basis for the field use of the carrier equipment.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (1)
1. A low-voltage power line noise recording and injecting system comprises a power line interface, a power supply module, a power line coupling filter, a power amplifier, an arbitrary waveform generator and a power line communication signal detection and analyzer, wherein the output of the arbitrary waveform generator is connected to the power amplifier;
the power supply module obtains electric energy from the power line interface, converts power frequency commercial power into low-voltage direct current and supplies power for the power amplifier;
the power line interface provides an interface with the power line to inject noise interference signals into the power line through a coupling signal isolation device.
The power line coupling filter completes the isolation of strong current and weak current, overvoltage and overcurrent protection, high-pass or band-pass filtering of an interference output passband, and coupling a noise signal output by the power amplifier to the power line, so that the impedance matching of a power line transmission channel and an interference output end is realized;
the arbitrary waveform generator is used for generating a required noise interference signal;
the power amplifier completes power amplification of the noise interference signal;
the power line communication signal detection and analyzer is realized by adopting a power line communication signal frequency band spectrum detector, and the power line communication signal frequency band spectrum detector receives signals in a power line communication signal frequency band, performs power spectrum detection on the signals and feeds back detection results to a tester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911232799.6A CN111030730A (en) | 2019-12-05 | 2019-12-05 | Low-voltage power line noise recording and injecting system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911232799.6A CN111030730A (en) | 2019-12-05 | 2019-12-05 | Low-voltage power line noise recording and injecting system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111030730A true CN111030730A (en) | 2020-04-17 |
Family
ID=70207570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911232799.6A Pending CN111030730A (en) | 2019-12-05 | 2019-12-05 | Low-voltage power line noise recording and injecting system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111030730A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111585663A (en) * | 2020-04-20 | 2020-08-25 | 杭州华立电力系统工程有限公司 | Method for reproducing low-voltage power line carrier communication characteristic interference noise |
| CN112260774A (en) * | 2020-10-26 | 2021-01-22 | 青岛鼎信通讯股份有限公司 | SD card-based low-voltage power line carrier communication noise injection system |
| CN112885071A (en) * | 2021-01-19 | 2021-06-01 | 中国电力科学研究院有限公司 | Interference simulation device and method for electricity consumption information acquisition channel |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1968007A (en) * | 2005-11-16 | 2007-05-23 | 弥亚微电子（上海）有限公司 | Digital power amplifier adapted for low-voltage carrier communication |
| CN101404523A (en) * | 2008-11-19 | 2009-04-08 | 南京新联电子股份有限公司 | Low-voltage powerline carrier communication experiment method and its experiment system |
| JP2009100293A (en) * | 2007-10-17 | 2009-05-07 | Murata Mfg Co Ltd | Vehicle power line communication system |
| CN201312312Y (en) * | 2008-11-19 | 2009-09-16 | 南京新联电子股份有限公司 | Low voltage power cord carrier communication test system |
| US20110051818A1 (en) * | 2009-08-31 | 2011-03-03 | Powertech Industrial Co., Ltd. | Power line transmission apparatus without public power system noise interference and method thereof |
| CN102420664A (en) * | 2011-11-30 | 2012-04-18 | 广东电网公司电力科学研究院 | Simulation system of noise signal for carrier test of low-voltage power line |
| CN103063936A (en) * | 2012-12-19 | 2013-04-24 | 中国电力科学研究院 | Spot low-voltage power line carrier channel noise testing system and method thereof |
| WO2014045566A1 (en) * | 2012-09-20 | 2014-03-27 | アイシン精機株式会社 | Power line communication transceiver and power line communication method |
| CN103916207A (en) * | 2014-04-11 | 2014-07-09 | 北京理工大学 | Active device and method for interfering multi-frequency-band power line communication |
| CN105356910A (en) * | 2015-11-27 | 2016-02-24 | 中电装备山东电子有限公司 | Test system for low-voltage power line carrier module |
| CN103856242B (en) * | 2012-11-30 | 2016-04-27 | 李祥明 | Power line communication countermeasure set |
| CN205647522U (en) * | 2016-05-25 | 2016-10-12 | 国网山东省电力公司平度市供电公司 | Low pressure power line carrier communication device |
| CN106230481A (en) * | 2016-08-31 | 2016-12-14 | 国网江西省电力公司电力科学研究院 | A kind of power line interference signal extraction and synchronous playback means |
| CN110444005A (en) * | 2019-08-08 | 2019-11-12 | 国网新疆电力有限公司电力科学研究院 | Low Voltage Power Line Carrier Record System interference free performance test method and system |
-
2019
- 2019-12-05 CN CN201911232799.6A patent/CN111030730A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1968007A (en) * | 2005-11-16 | 2007-05-23 | 弥亚微电子（上海）有限公司 | Digital power amplifier adapted for low-voltage carrier communication |
| JP2009100293A (en) * | 2007-10-17 | 2009-05-07 | Murata Mfg Co Ltd | Vehicle power line communication system |
| CN101404523A (en) * | 2008-11-19 | 2009-04-08 | 南京新联电子股份有限公司 | Low-voltage powerline carrier communication experiment method and its experiment system |
| CN201312312Y (en) * | 2008-11-19 | 2009-09-16 | 南京新联电子股份有限公司 | Low voltage power cord carrier communication test system |
| US20110051818A1 (en) * | 2009-08-31 | 2011-03-03 | Powertech Industrial Co., Ltd. | Power line transmission apparatus without public power system noise interference and method thereof |
| CN102420664A (en) * | 2011-11-30 | 2012-04-18 | 广东电网公司电力科学研究院 | Simulation system of noise signal for carrier test of low-voltage power line |
| WO2014045566A1 (en) * | 2012-09-20 | 2014-03-27 | アイシン精機株式会社 | Power line communication transceiver and power line communication method |
| CN103856242B (en) * | 2012-11-30 | 2016-04-27 | 李祥明 | Power line communication countermeasure set |
| CN103063936A (en) * | 2012-12-19 | 2013-04-24 | 中国电力科学研究院 | Spot low-voltage power line carrier channel noise testing system and method thereof |
| CN103916207A (en) * | 2014-04-11 | 2014-07-09 | 北京理工大学 | Active device and method for interfering multi-frequency-band power line communication |
| CN105356910A (en) * | 2015-11-27 | 2016-02-24 | 中电装备山东电子有限公司 | Test system for low-voltage power line carrier module |
| CN205647522U (en) * | 2016-05-25 | 2016-10-12 | 国网山东省电力公司平度市供电公司 | Low pressure power line carrier communication device |
| CN106230481A (en) * | 2016-08-31 | 2016-12-14 | 国网江西省电力公司电力科学研究院 | A kind of power line interference signal extraction and synchronous playback means |
| CN110444005A (en) * | 2019-08-08 | 2019-11-12 | 国网新疆电力有限公司电力科学研究院 | Low Voltage Power Line Carrier Record System interference free performance test method and system |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111585663A (en) * | 2020-04-20 | 2020-08-25 | 杭州华立电力系统工程有限公司 | Method for reproducing low-voltage power line carrier communication characteristic interference noise |
| CN112260774A (en) * | 2020-10-26 | 2021-01-22 | 青岛鼎信通讯股份有限公司 | SD card-based low-voltage power line carrier communication noise injection system |
| CN112885071A (en) * | 2021-01-19 | 2021-06-01 | 中国电力科学研究院有限公司 | Interference simulation device and method for electricity consumption information acquisition channel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111030730A (en) | Low-voltage power line noise recording and injecting system | |
| CN101246043B (en) | On-line monitoring method for vibration and noise of AC power transformer influenced by DC magnetic biasing | |
| CN102243289B (en) | Method and apparatus for partial discharge detection of high-voltage electrical power equipment with hardware anti-interference utilization | |
| RU2425389C2 (en) | Sensor to monitor high-voltage insulation | |
| CN103529371B (en) | A kind of intrusive mood controller switching equipment local discharge on-line monitoring device | |
| CN111624437B (en) | Integrated comprehensive underground cable maintenance detection method, detection system and detection instrument | |
| CN103969562A (en) | Simulated partial discharge detection device for switch cabinet | |
| CN107797033B (en) | Detection platform for simulating partial discharge test of transformer | |
| CN108089092B (en) | Generator rotor winding leakage detection device | |
| CN103516397A (en) | Method and system for separating electric signal based on power line carrier | |
| CN104614648A (en) | Electroacoustic combined DC local discharging detecting device | |
| CN106330260B (en) | The laboratory test device and method of low voltage power line carrier performance | |
| CN106885975A (en) | A kind of high-tension cable ageing testing method and device based on impulse response | |
| CN108169589A (en) | Power line communication environment measuring device and test method | |
| CN105423908A (en) | Transformer winding deformation live test method and system | |
| CN108919070A (en) | A kind of partial discharge of switchgear detection system of Multi-source Information Fusion | |
| CN103513158A (en) | Damped oscillatory wave lower cable local discharge detection device and method | |
| CN105429656A (en) | Signal processing device based on shortwave broadband reception demodulation front end | |
| CN108155921A (en) | System is tested in a kind of power wire broadband carrier communication networking | |
| CN203950012U (en) | Switch cubicle partial simulation discharging detection device | |
| CN203691554U (en) | TV main board audio frequency output test system | |
| CN111585663B (en) | Method for reproducing low-voltage power line carrier communication characteristic interference noise | |
| CN105933079B (en) | Detection system and detection method for communication performance of carrier signals with different frequencies | |
| Khangosstar et al. | An experimental analysis in time and frequency domain of impulse noise over power lines | |
| CN107544043B (en) | Multifunctional digital helium optical pump magnetometer test probe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200417 |
|
| RJ01 | Rejection of invention patent application after publication |