CN110535489B - Acquisition and playing system for low-voltage carrier communication high-frequency interference signals - Google Patents
Acquisition and playing system for low-voltage carrier communication high-frequency interference signals Download PDFInfo
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Abstract
The invention relates to the technical field of anti-interference performance testing, in particular to a system for acquiring and playing a low-voltage carrier communication high-frequency interference signal, which comprises a noise signal acquisition device, a simulation module, a noise signal electrical cabinet and an electrical energy meter cabinet; the noise signal acquisition device comprises an acquisition coupler and an A/D acquisition card, and the noise of the A/D acquisition card is sent to the simulation module; the simulation module is used for integrating the noise signals; the noise signal electric cabinet comprises an industrial personal computer, a noise output control module and a first-stage amplifier, and the electric energy meter cabinet comprises a second-stage amplifier, an A-phase coupler, a B-phase coupler, a C-phase coupler and the like. The invention collects the noise data of the power utilization environment field through the A/D acquisition card, stores the noise through the noise database in the industrial personal computer, plays the noise signal under different environments through the noise output control module, simulates the actual noise signal to achieve the purpose of really restoring the field characteristic platform area noise, and provides real noise data for the low-voltage carrier power communication noise reduction.
Description
Technical Field
The invention relates to the technical field of anti-interference performance testing, in particular to a system for acquiring and playing a low-voltage carrier communication high-frequency interference signal.
Background
The low-voltage carrier communication is a technology for realizing data transmission and information exchange by using an existing low-voltage distribution network as a transmission medium. The established voltage network can be directly utilized, so that the construction investment of communication transmission media is greatly saved. Most of the traditional low-voltage power line carrier communication adopts frequency band transmission, and a carrier modulation method is adopted to carry a power communication digital signal to be transmitted to a carrier signal with higher frequency, and the signal is transmitted after modulation and demodulation. Although low-voltage carrier communication has the advantages of quick effect, durability, robustness, low investment and the like, because the low-voltage power line is used as a communication medium, the low-voltage carrier communication has the defects of various noise types, strong interference sources, multiple loads, large signal attenuation and the like.
Disclosure of Invention
The invention provides a system for collecting and playing a low-voltage carrier communication high-frequency interference signal, overcomes the defects of the prior art, and can effectively solve the problem of inaccurate low-voltage carrier communication noise interference test caused by the fact that the noise environment where a communication device is located cannot be obtained and inverted in the prior art.
The technical scheme of the invention is realized by the following measures: a collection and playing system of low-voltage carrier communication high-frequency interference signals comprises a noise signal collection device, a simulation module, a noise signal electrical cabinet and an electric energy meter cabinet;
the noise signal acquisition device comprises an acquisition coupler and an A/D acquisition card for acquiring line noise signals, and the A/D acquisition card transmits various acquired noise signals to the simulation module;
the simulation module is used for integrating and processing various collected noise signals and enriching the types of noise;
the noise signal electrical cabinet comprises an industrial personal computer, a noise output control module and a first-stage amplifier, wherein the industrial personal computer receives various noise signals sent by the simulation module and stores the various noise signals in the industrial personal computer in a centralized manner to form a noise database and control the output and playing of various noises, the noise output control module is used for calling noise information of each station area in the noise database and controlling the gain multiple and the output of an amplitude value, a time domain graph and a frequency spectrum graph of the noise signals, and the first-stage amplifier is used for amplifying the amplitude value of the noise signals output by the noise output control module for the first time;
the electric energy meter cabinet comprises a second-stage amplifier, an A-phase coupler, a B-phase coupler and a C-phase coupler, the first-stage amplifier is connected with the second-stage amplifier through a signal output line, the second-stage amplifier is used for amplifying noise signals again, and the A-phase coupler, the B-phase coupler and the C-phase coupler are respectively used for preventing power frequency currents on the A-phase power line, the B-phase power line and the C-phase power line from entering the communication terminal.
The following is further optimization or/and improvement of the technical scheme of the invention:
the communication channel testing device comprises a sinusoidal signal generating device and a communication terminal, wherein the sinusoidal signal generating device sends a testing signal with a specified frequency and sends the testing signal to the communication terminal, and whether the communication state of the communication channel is good or not is tested according to whether the communication terminal can detect the sent testing signal with the specified frequency or not.
The signal output line is a connecting line for converting one path of D/A channel signal output into at least eight paths of signals, and is used for providing noise required by testing for at least eight electric energy meter cabinets.
The models of the first-stage amplifier and the second-stage amplifier are FAY2000, the number of the first-stage amplifiers is 1, and the number of the second-stage amplifiers is at least 8.
The A-phase coupler, the B-phase coupler and the C-phase coupler are couplers of ZCAT3035-1330, and the number of the couplers is at least 24.
The type of the acquisition coupler is ZCAT3035-1330, and the type of the A/D acquisition card is Mohua PCI-1721.
The invention has the beneficial effects that:
(1) the invention can accurately acquire the noise data of the site of the power utilization environment through the A/D acquisition card and store the noise through the noise database in the industrial personal computer, the noise data is stored, then the noise signal is played under different environments through the noise output control module, the actual noise signal is simulated to achieve the purpose of really restoring the noise of the site characteristic station area, the real noise data is provided for the low-voltage carrier power communication noise reduction, and the electric power metering center is helped to analyze the meter reading performance of the electric power meter under the real noise environment.
(2) The invention enriches the types of noise by using MATLAB simulation software, and provides an environmental condition and a test platform for researching low-voltage carrier communication noise interference in a laboratory.
(3) The invention can conveniently call the required noise type in the established noise database through the noise signal output control module, control the amplification degree of various noise signals, the sampling frequency and the output of time domain and frequency domain graphs, has simple operation and intuitive function and meets the requirements of users.
Drawings
FIG. 1 is a block diagram of the system of the present invention.
Fig. 2 is a block diagram of a noise signal acquisition device according to the present invention.
Fig. 3 is a structural block diagram of the noise signal electrical cabinet of the present invention.
Fig. 4 is a structural block diagram of the electric energy meter cabinet of the present invention.
FIG. 5 is a schematic structural diagram of a signal testing module according to the present invention.
Detailed Description
The present invention is not limited by the following examples, and specific embodiments may be determined according to the technical solutions and practical situations of the present invention.
The invention is further described with reference to the following examples and figures:
as shown in fig. 1, 2, 3 and 4, the system for acquiring and playing the low-voltage carrier communication high-frequency interference signal comprises a noise signal acquisition device, a simulation module, a noise signal electrical cabinet and an electrical energy meter cabinet;
the noise signal acquisition device comprises an acquisition coupler and an A/D acquisition card for acquiring line noise signals, and the A/D acquisition card transmits various acquired noise signals to the simulation module;
the simulation module is used for integrating and processing various collected noise signals and enriching the types of noise;
the noise signal electrical cabinet comprises an industrial personal computer, a noise output control module and a first-stage amplifier, wherein the industrial personal computer receives various noise signals sent by the simulation module and stores the various noise signals in the industrial personal computer in a centralized manner to form a noise database and control the output and playing of various noises, the noise output control module is used for calling noise information of each station area in the noise database and controlling the gain multiple and the output of an amplitude value, a time domain graph and a frequency spectrum graph of the noise signals, and the first-stage amplifier is used for amplifying the amplitude value of the noise signals output by the noise output control module for the first time;
the electric energy meter cabinet comprises a second-stage amplifier, an A-phase coupler, a B-phase coupler and a C-phase coupler, the first-stage amplifier is connected with the second-stage amplifier through a signal output line, the second-stage amplifier is used for amplifying noise signals again, and the A-phase coupler, the B-phase coupler and the C-phase coupler are respectively used for preventing power frequency currents on the A-phase power line, the B-phase power line and the C-phase power line from entering the communication terminal.
The simulation module can be MATLAB simulation software, can be used for enriching the types of noise and removing other types of noise acquired by an A/D acquisition card. The industrial personal computer can be a porphyry industrial control computer, the noise signal is integrated and processed by MATLAB simulation software, and then is stored into a noise database of the porphyry industrial computer through a USB interface, and the playing and the output of the noise are controlled by labview software in the porphyry industrial computer. The invention can automatically program a control program through labview software, can input a noise data signal acquired on site for playback, and can inject an electric power circuit to simulate an actual noise signal. The noise output control module can be a high-speed D/A acquisition card, and the porphyry industrial control computer is connected with the noise output control module through a PCI bus to realize the playing and output of various noises. The second-stage amplifier is used for further amplifying the noise signal and improving the load carrying capacity of the noise. The phase A coupler, the phase B coupler and the phase C coupler are used for preventing 50Hz power frequency current on the power line from entering the communication terminal.
The invention collects noise data of different sites through the noise signal collecting device, stores each noise data to the noise database of the central control machine, and plays the collected noise in different environments through the noise output control module, so as to achieve the purpose of really restoring the noise of the site characteristic station area, and provide environmental conditions and a test platform for various researches on noise interference of low-voltage carrier communication in a simulation laboratory.
The following is further optimization or/and improvement of the technical scheme of the invention:
as shown in fig. 1 and 5, the communication device further includes a channel testing module, where the channel testing module includes a sinusoidal signal generating device and a communication terminal, the sinusoidal signal generating device sends a test signal with a specified frequency and sends the test signal to the communication terminal, and the communication terminal tests whether the communication state of the communication channel is good or not according to whether the communication terminal can detect the sent test signal with the specified frequency.
As shown in fig. 3 and 4, the signal output line is a connection line for converting one path of D/a channel signal output into at least eight paths of signals, so as to provide noise required by the test to at least eight electric energy meter cabinets.
As shown in fig. 3 and 4, the first-stage amplifier and the second-stage amplifier are both FAY2000, the number of the first-stage amplifiers is 1, and the number of the second-stage amplifiers is at least 8.
The A-phase coupler, the B-phase coupler and the C-phase coupler are respectively models of ZCAT3035-1330 couplers according to requirements, and the number of the couplers is at least 24.
According to the requirement, the model of the acquisition coupler is ZCAT3035-1330, and the model of the A/D acquisition card is Mohua PCI-1721.
The above technical features constitute the best embodiment of the present invention, which has strong adaptability and best implementation effect, and unnecessary technical features can be increased or decreased according to actual needs to meet the requirements of different situations.
Claims (6)
1. A collection and playing system of low-voltage carrier communication high-frequency interference signals is characterized by comprising a noise signal collection device, a simulation module, a noise signal electrical cabinet and an electric energy meter cabinet;
the noise signal acquisition device comprises an acquisition coupler and an A/D acquisition card for acquiring line noise signals, and the A/D acquisition card transmits various acquired noise signals to the simulation module;
the simulation module is used for integrating and processing various collected noise signals and enriching the types of noise;
the noise signal electrical cabinet comprises an industrial personal computer, a noise output control module and a first-stage amplifier, wherein the industrial personal computer receives various noise signals sent by the simulation module and stores the various noise signals in the industrial personal computer in a centralized manner to form a noise database and control the output and playing of various noises, the noise output control module is used for calling noise information of each station area in the noise database and controlling the gain multiple and the output of an amplitude value, a time domain graph and a frequency spectrum graph of the noise signals, and the first-stage amplifier is used for amplifying the amplitude value of the noise signals output by the noise output control module for the first time;
the electric energy meter cabinet comprises a second-stage amplifier, an A-phase coupler, a B-phase coupler and a C-phase coupler, the first-stage amplifier is connected with the second-stage amplifier through a signal output line, the second-stage amplifier is used for amplifying noise signals again, and the A-phase coupler, the B-phase coupler and the C-phase coupler are respectively used for preventing power frequency currents on the A-phase power line, the B-phase power line and the C-phase power line from entering the communication terminal.
2. The system for collecting and playing the low-voltage carrier communication high-frequency interference signal according to claim 1, further comprising a channel testing module, wherein the channel testing module comprises a sinusoidal signal generating device and a communication terminal, the sinusoidal signal generating device sends a testing signal with a specified frequency and sends the testing signal to the communication terminal, and whether the communication state of the communication channel is good or not is tested according to whether the communication terminal can detect the sent testing signal with the specified frequency.
3. The system for collecting and playing the low-voltage carrier communication high-frequency interference signal according to claim 2, wherein the signal output line is a connecting line for converting one channel of D/a channel signal output into at least eight channels of signals, so as to provide noise required by testing for at least eight electric energy meter cabinets.
4. The system for collecting and playing back the low-voltage carrier communication high-frequency interference signal according to any one of claims 1 to 3, wherein the types of the first-stage amplifier and the second-stage amplifier are FAY2000, the number of the first-stage amplifiers is 1, and the number of the second-stage amplifiers is at least 8.
5. The system for collecting and playing back high-frequency interference signals in low-voltage carrier communication according to any one of claims 1 to 3, wherein the type of each of the A-phase coupler, the B-phase coupler and the C-phase coupler is ZCAT3035-1330, and the number of the couplers is at least 24.
6. The system for collecting and playing back the low voltage carrier communication high frequency interference signal according to any one of claims 1 to 3, wherein the type of the collecting coupler is ZCAT3035-1330, and the type of the A/D collecting card is Moraxe PCI-1721.
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| TWI266215B (en) * | 2002-08-12 | 2006-11-11 | Silicon Integrated Sys Corp | Method for analyzing power noise and method for reducing the same |
| CN102487299B (en) * | 2010-12-03 | 2014-02-19 | 华北电力科学研究院有限责任公司 | Method and device for simulating noise of power line carrier channel |
| CN102655422B (en) * | 2011-03-02 | 2014-01-01 | 华北电力科学研究院有限责任公司 | Test system for low-voltage power carrier communication equipment |
| CN102255637B (en) * | 2011-07-15 | 2015-01-21 | 中国电力科学研究院 | Carrier communication test equipment |
| US20140086346A1 (en) * | 2012-09-21 | 2014-03-27 | Samsung Electronics Co., Ltd. | Method and system for removal of baseline wander and power-line interference |
| CN103346846B (en) * | 2013-06-21 | 2015-06-10 | 国家电网公司 | Communication channel stimulation system of electricity consumption information collection system |
| CN106027122A (en) * | 2016-07-05 | 2016-10-12 | 重庆电力高等专科学校 | Method for modeling background noise in low-voltage power line channel |
| CN108631819A (en) * | 2017-03-15 | 2018-10-09 | 国网四川省电力公司电力科学研究院 | Power line carrier noise jamming tests system and test method |
| CN107425881A (en) * | 2017-06-06 | 2017-12-01 | 中国电力科学研究院 | A kind of method and system tested for low-voltage power line bandwidth carrier communication performance |
| CN108337017B (en) * | 2017-12-29 | 2021-06-01 | 北京智芯微电子科技有限公司 | Power line carrier communication test networking system with flexibly-transformed topological structure |
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