CN113810081B - Power distribution and utilization acquisition simulation system of HPLC (high performance liquid chromatography) of program-controlled attenuator - Google Patents
Power distribution and utilization acquisition simulation system of HPLC (high performance liquid chromatography) of program-controlled attenuator Download PDFInfo
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- CN113810081B CN113810081B CN202111217094.4A CN202111217094A CN113810081B CN 113810081 B CN113810081 B CN 113810081B CN 202111217094 A CN202111217094 A CN 202111217094A CN 113810081 B CN113810081 B CN 113810081B
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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
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
- H04B3/48—Testing attenuation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
Abstract
The invention relates to the technical field of communication electronic systems, and discloses an electricity distribution and utilization acquisition simulation system of an HPLC (high performance liquid chromatography) of a program-controlled attenuator, which comprises a power grid simulation unit, a program-controlled attenuation module, a coupling filtering module, a signal generation module, a circuit breaker, a concentrator and a three-phase electric energy meter, wherein the coupling filtering module is respectively connected with the program-controlled attenuation module, the circuit breaker and the power grid simulation unit, the circuit breakers are mutually connected, the signal generation module, the concentrator and the three-phase electric energy meter are respectively connected on a connecting line of the circuit breaker, and the coupling filtering module is also connected with a plurality of electric energy meters in parallel; the grid simulation unit converts the existing ac grid power into a stable, pure sine wave power of the desired frequency. The invention utilizes a program-controlled attenuation module, a coupling filtering module and a signal generation module to simulate the carrier signal attenuation, noise interference and multi-level carrier topology identification functions in the environment of acquiring the power consumption information of the HPLC.
Description
Technical Field
The invention relates to the technical field of communication electronic systems, in particular to a power distribution and utilization acquisition simulation system of an HPLC (high performance liquid chromatography) of a program-controlled attenuator.
Background
The high-speed carrier communication (HPLC) of the voltage power line is a special and basic communication mode of a power system, and is a technology for carrying out high-speed transmission on analog/digital signals by utilizing the existing power line through the carrier mode, the power line is used as a network access scheme, the existing power distribution network is used for communication, rewiring is not needed, the high-speed carrier communication (HPLC) has wide application in a power distribution acquisition system, however, the voltage power line is not specially used for transmitting communication data, and in an actual distribution electric field scene, the transmission model is very complex in channel characteristic, high in load, strong in noise interference, large in signal attenuation and the like due to the special physical characteristics.
The conventional power consumption information acquisition system in the laboratory only tests the conditions of consistency, reliability and the like of HPLC communication under laboratory conditions, lacks simulation of actual conditions, cannot embody the communication level of carrier communication under an actual operation scene, is connected with a radio frequency weak current signal by a program control attenuation module, and cannot be directly introduced into a 220V strong current environment of the power consumption information acquisition system.
Disclosure of Invention
The invention aims to provide an electricity distribution and consumption acquisition simulation system of an HPLC (high performance liquid chromatography) of a program-controlled attenuator, which simulates the actual channel attenuation and noise interference conditions of HPLC communication in an electricity distribution and consumption acquisition environment by using a program-controlled attenuation module, a coupling filtering module and a signal generation module, simulates the carrier signal attenuation, noise interference and multi-level carrier topology identification functions in the environment close to the actual HPLC electricity consumption information acquisition environment, and aims to solve the problems that the electricity consumption information acquisition system commonly used in a laboratory in the prior art only tests the conditions of consistency, reliability and the like of the HPLC communication under the laboratory condition, lacks simulation of the actual conditions and cannot embody the communication level of the carrier communication under the actual operation scene.
The invention is realized in such a way that the power distribution and utilization acquisition simulation system of the HPLC of the program-controlled attenuator comprises a power grid simulation unit, a program-controlled attenuation module, a coupling filtering module, a signal generation module, a circuit breaker, a concentrator and a three-phase electric energy meter, wherein the coupling filtering module is respectively connected with the program-controlled attenuation module, the circuit breaker and the power grid simulation unit, the circuit breakers are mutually connected, the signal generation module, the concentrator and the three-phase electric energy meter are respectively connected on a connecting line of the circuit breaker, and the coupling filtering module is also connected with a plurality of electric energy meters in parallel; the power grid simulation unit converts the existing alternating current power grid power supply into a stable pure sine wave power supply with required frequency, provides a pure input power supply for a simulation system, and avoids abnormal interference of a power grid.
Further, the coupling filtering module filters out the high-frequency signals of the upper stage, keeps the power frequency sine wave for signal output, and the program-controlled attenuation module separates and couples the input analog signals out of the power frequency sine wave overlapped on the power signals and separates the input analog signals into 50Hz power signals and couples out of the high-frequency communication signals overlapped on the power signals for transmission.
Furthermore, the CAN communication mode adopted by the program-controlled attenuation module CAN be cascaded, the adaptive connection is carried out through the address code of the 8-bit BCD code on the attenuation module, the attenuation amplitude of the whole module is further adjusted, and meanwhile, the signal channel direction of the module CAN be changed through the switching unit.
Further, the program-controlled attenuation module controls the attenuation amplitude of the whole attenuation module based on 4-path radio frequency chips Sky12347-362LF controlled by TTL signals of STM32F103C8T6, the default maximum attenuation amplitude of the Sky12347-362LF chips is 31.5dB, the stepping value is 0.5dB, 1-path of the 4-path radio frequency chips work in a seven-gear default mode, all the other 3-path gears are fixed at 31.5dB, and the carry mode is adopted for operation.
Further, the signal generation module adopts a signal generator for outputting 25MHz sine wave, square wave, sawtooth wave, pulse and noise waveform as noise interference introduced in the power acquisition simulation system, and simulates noise interference caused by various conditions in a real environment.
Further, the program-controlled attenuation module comprises a downloading end, the downloading end receives signals of the coupling filtering module to the MCU processing unit, and the MCU processing unit performs forward and reverse direction switching conversion on the existing alternating current power grid power supply to obtain a stable pure sine wave power supply with required frequency.
Further, the input end of the MCU processing unit is connected with an MCU power supply unit for supplying energy, and the output end of the MCU processing unit is connected with a CAN communication unit for carrying out multiple cascade connection.
Further, after the MCU processing unit processes the data, the driving unit is used for adjusting the attenuation amplitude of the whole module, and the adjusted attenuation amplitude parallel data are output to the coupling filtering module.
Further, the coupling filtering module filters out high-frequency signals of an upper stage through the LC filtering circuit, separates the input analog signals into 50Hz power signals and couples out high-frequency communication signals superposed on the power signals.
Further, the high-frequency communication signal is coupled to the power signal again after being attenuated by the program-controlled attenuation module and is input to the next stage.
Compared with the prior art, the power distribution and utilization acquisition simulation system for the HPLC of the program-controlled attenuator has the following beneficial effects:
1. the simulation system comprises the following components: the system comprises a power grid simulation unit, a program-controlled attenuation module, a coupling filtering module, a signal generation module, a circuit breaker, a concentrator and a single/three-phase electric energy meter, wherein the concentrator can simulate a 4-layer HPLC communication network by adjusting different attenuation amplitude values through information reading capacity of the HPLC communication on the multistage electric energy meter under the conditions of different line attenuation and noise interference application;
2. the program-controlled attenuation module, the coupling filtering module and the signal generation module are utilized to simulate the actual channel attenuation and noise interference of HPLC communication in the power distribution and utilization acquisition environment, and the carrier signal attenuation, noise interference and multi-level carrier topology identification functions in the power distribution and utilization acquisition environment are simulated under the laboratory condition.
Drawings
FIG. 1 is a system frame diagram of a power distribution and acquisition simulation system for HPLC of a programmable attenuator provided by the invention;
FIG. 2 is a schematic diagram of a power grid simulation unit in the power distribution and consumption acquisition simulation system of the HPLC of the program-controlled attenuator provided by the invention;
FIG. 3 is a schematic diagram of a program controlled attenuator module in an electrical acquisition simulation system for HPLC of the program controlled attenuator according to the present invention;
fig. 4 is a frame diagram of a coupling filter module in an electrical acquisition simulation system for HPLC of a programmable attenuator according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The implementation of the present invention will be described in detail below with reference to specific embodiments.
The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; and are not to be construed as limiting the present patent, and the specific meaning of the terms described above will be understood by those of ordinary skill in the art in light of the specific circumstances.
Referring to fig. 1-4, a preferred embodiment of the present invention is provided.
The power distribution and utilization acquisition simulation system of the HPLC of the program-controlled attenuator comprises a power grid simulation unit, a program-controlled attenuation module, a coupling filtering module, a signal generation module, a circuit breaker, a concentrator and a three-phase electric energy meter, wherein the coupling filtering module is respectively connected with the program-controlled attenuation module, the circuit breaker and the power grid simulation unit, the circuit breakers are mutually connected, the signal generation module, the concentrator and the three-phase electric energy meter are respectively connected to a connecting line of the circuit breaker, the coupling filtering module is also connected with a plurality of electric energy meters in parallel, and the concentrator performs information reading capacity on the multi-stage electric energy meter through HPLC communication under the conditions that power utilization information acquisition areas attenuate and apply noise interference on different lines;
specifically, the power grid simulation unit is manufactured in an MPWM mode by taking a microprocessor as a core, and an active element IGBT module is used for designing, and the existing alternating current power grid power supply is converted into a stable and pure sine wave power supply with required frequency by adopting digital frequency division, D/A conversion, instantaneous value feedback and sine pulse width modulation technology and through AC-DC-AC conversion inversion power supply.
The main working flow of the power grid simulation unit is shown in fig. 2, after the time point is input, the NFB fuse-free switch is input, the jump disconnection switch is judged, a series of operations such as filtering and the like are performed, the NFB is output, the set overcurrent, overvoltage and overtemperature detection is performed for protection, the jump disconnection control is performed for intervention protection, the pure input power supply is provided, and the abnormal interference of the power grid is avoided.
In this embodiment, the program-controlled attenuation module controls the attenuation amplitude of the whole attenuation module based on the 4-channel radio frequency chip Sky12347-362LF controlled by the TTL signal of STM32F103C8T 6. Sky12347-362LF chip defaults maximum attenuation amplitude to 31.5dB, stepping value to 0.5dB, 4-path radio frequency chip wherein 1-path works under seven-path default mode, and 3-path all lower gears are fixed at 31.5dB, and carry mode operation is adopted. The program-controlled attenuation module adopts a CAN communication mode, a plurality of the program-controlled attenuation modules CAN be cascaded, and the program-controlled attenuation module is adapted to be connected with a machine through an address code of an 8-bit BCD code on the attenuation module, so that the attenuation amplitude of the whole module is adjusted. While the attenuation module can change the signal path direction of the module through the switching unit.
In the embodiment, the coupling filter module has two functions, and under the condition of independent work, the upper-level high-frequency signal is filtered out by the LC filter circuit, and a clean power frequency sine wave is reserved; under the condition of matching the attenuation module in the system, the analog signal input into the coupling filtering module can be separated into 50Hz power signals, the power signals are coupled out of high-frequency communication signals superposed on the power signals and input into the attenuation module, and the power signals are coupled to the next stage after being attenuated and output by the attenuation module.
Specifically, the design of the coupling filtering module takes the authenticity of the electricity consumption information acquisition simulation system into consideration, and maximally supports the load current of 10A, so that the character passing current can be provided for the simulated ammeter.
In this embodiment, the signal generating module uses a signal generator that supports outputting 25MHz sine wave, square wave, sawtooth wave, pulse and noise waveform as noise interference introduced in the power acquisition simulation system, to simulate noise interference caused by various conditions in the real environment.
In the embodiment, the concentrator and the single/three-phase electric energy meter adopt intelligent electric energy meters of a national network conforming to DLT645-2007 communication protocol and support an HPLC carrier communication function.
In this embodiment, the usage flow of the program-controlled attenuation module is as shown in fig. 3, the program-controlled attenuation module includes a downloading end, the downloading end receives signals of the coupling filtering module to the MCU processing unit, the MCU processing unit switches the existing ac power supply in forward and reverse directions to convert the current ac power supply into a stable pure sine wave power supply with required frequency, the input end of the MCU processing unit is connected with the power supply unit for supplying power, the output end of the MCU processing unit is connected with the CAN communication unit for performing multiple cascade connection, the MCU processing unit processes data and then adjusts attenuation amplitude of the whole module by using the driving unit, and the adjusted attenuation amplitude is outputted to the coupling filtering module in parallel.
In this embodiment, the use flow of the coupling filtering module is as shown in fig. 4, the coupling filtering module filters out the high-frequency signal of the upper stage through the LC filtering circuit, separates the input analog signal into the power signal of 50Hz and couples out the high-frequency communication signal superimposed on the power signal, and the high-frequency communication signal is coupled to the power signal again after being attenuated by the program-controlled attenuation module and input to the next stage.
According to the technical scheme, the program-controlled attenuation module, the coupling filtering module and the signal generation module are utilized to simulate the actual channel attenuation and noise interference of HPLC communication in the power distribution and utilization acquisition environment, under the laboratory condition, the carrier signal attenuation, noise interference and multi-level carrier topology identification functions close to the actual HPLC power utilization information acquisition environment are simulated, and the power utilization information acquisition station area can simulate a 4-layer HPLC communication network through the information reading capability of the concentrator to the multi-level ammeter through HPLC communication under the condition of different line attenuation and noise interference application.
In this embodiment, the whole operation process may be controlled by a computer, and a PLC or the like, so as to implement automatic operation control, and in each operation link, signal feedback may be performed by setting a sensor, so as to implement sequential steps, which are conventional knowledge of current automatic control, and are not described in detail in this embodiment.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (7)
1. The power distribution and utilization acquisition simulation system of the HPLC of the program-controlled attenuator is characterized by comprising a power grid simulation unit, a program-controlled attenuation module, a coupling filtering module, a signal generation module, a circuit breaker, a concentrator and a three-phase summary table, wherein the coupling filtering module is respectively connected with the program-controlled attenuation module, the circuit breaker and the power grid simulation unit, the circuit breakers are mutually connected, the signal generation module, the concentrator and the three-phase summary table are respectively connected on a connecting line of the circuit breaker, and the coupling filtering module is also connected with a plurality of electric energy meters in parallel;
the signal generation module adopts a signal generator which outputs 25MHz sine wave, square wave, sawtooth wave, pulse and noise waveform as noise interference introduced in an electricity acquisition simulation system, and simulates noise interference caused by various conditions in a real environment;
the program-controlled attenuation module comprises a downloading end, the downloading end receives signals of the coupling filtering module to the MCU processing unit, and the MCU processing unit performs forward and reverse direction switching conversion on the existing alternating current power grid power supply to obtain a stable and pure sine wave power supply with required frequency;
the coupling filtering module filters out high-frequency signals of an upper stage through an LC filtering circuit, separates an input analog signal into 50Hz power signals and couples out high-frequency communication signals superposed on the power signals;
the power grid simulation unit converts the existing alternating current power grid power supply into a stable pure sine wave power supply with required frequency, provides a pure input power supply for a simulation system, and avoids abnormal interference of a power grid.
2. The analog system for power acquisition by HPLC of a programmable attenuator of claim 1, wherein the coupling filter module filters out high frequency signals of the upper stage, retains the power frequency sine wave for signal output, and separates and couples the input analog signal out of the power frequency sine wave superimposed on the power signal and separates the input analog signal into 50Hz power signal and couples out of the high frequency communication signal superimposed on the power signal for transmission.
3. The system for simulating power acquisition by HPLC of a programmable attenuator of claim 2, wherein the programmable attenuator module adopts a CAN communication mode capable of being cascaded, and the adaptive connection is performed by the address code of the 8-bit BCD code on the attenuator module, so as to adjust the attenuation amplitude of the whole module, and meanwhile, the signal channel direction of the module CAN be changed by the switching unit.
4. The system for simulating power distribution and consumption collection of HPLC (high performance liquid chromatography) of a program-controlled attenuator according to claim 3, wherein the program-controlled attenuation module controls the attenuation amplitude of the whole attenuation module based on 4 paths of radio frequency chips Sky12347-362LF controlled by TTL signals of STM32F103C8T6, the default maximum attenuation amplitude of the Sky12347-362LF chips is 31.5dB, the stepping value is 0.5dB, 1 path of the 4 paths of radio frequency chips is operated in a seven-gear default mode, all the other 3 paths of gears are fixed at 31.5dB, and the system is operated in a carry mode.
5. The power distribution and utilization acquisition simulation system for the HPLC of the program-controlled attenuator according to claim 1, wherein the input end of the MCU processing unit is connected with an MCU power supply unit for supplying energy, and the output end of the MCU processing unit is connected with a CAN communication unit for carrying out a plurality of cascade connections.
6. The system for simulating power distribution and acquisition of HPLC of a programmable attenuator of claim 5, wherein the MCU processes the data and then adjusts the attenuation amplitude of the whole module by the driving unit, and the adjusted attenuation amplitude is outputted to the coupling filter module in parallel.
7. The system of claim 1, wherein the high frequency communication signal is re-coupled to the power signal after passing through the attenuation output of the programmable attenuation module and input to the next stage.
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| CN101902255B (en) * | 2010-04-02 | 2013-01-09 | 深圳市蓝可迪科技有限公司 | Simulation test device and method of power line carrier communication |
| CN102255637B (en) * | 2011-07-15 | 2015-01-21 | 中国电力科学研究院 | Carrier communication test equipment |
| 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 |
| CN108155921A (en) * | 2018-02-02 | 2018-06-12 | 国网江西省电力有限公司电力科学研究院 | System is tested in a kind of power wire broadband carrier communication networking |
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