CN107294562B - Low-voltage power carrier module simulation detection device - Google Patents
Low-voltage power carrier module simulation detection device Download PDFInfo
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- CN107294562B CN107294562B CN201710703628.1A CN201710703628A CN107294562B CN 107294562 B CN107294562 B CN 107294562B CN 201710703628 A CN201710703628 A CN 201710703628A CN 107294562 B CN107294562 B CN 107294562B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/46—Monitoring; Testing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/542—Systems for transmission via power distribution lines the information being in digital form
Abstract
The invention relates to a detection device for a carrier chip, a communication module, a meter, an integrated meter reading and the like related to low-voltage power line carrier communication meter reading, in particular to a low-voltage power line carrier module simulation detection device. The problem of prior art use the monomer module as the test object, can not test from whole carrier communication network is whole, consequently can not investigate the actual whole result of use after the network deployment is solved. The detection device comprises a three-phase power distribution cabinet, a concentrator communication cabinet, seven carrier meter communication cabinets, a master station which is communicated with the concentrator communication cabinet and is provided with meter reading detection software, and a control computer which is used for controlling the concentrator communication cabinet and each carrier meter communication cabinet. The invention aims to establish a low-voltage power line carrier communication simulation detection simulation network system, which takes the whole carrier communication network as a general object, simulates the application process of carrier communication meter reading and realizes simulation detection analysis in carrier module networks of different types according to the actual application result.
Description
Technical Field
The invention relates to a detection device for a carrier chip, a communication module, a meter, a centralized meter reading and the like related to low-voltage power line carrier communication meter reading, in particular to a low-voltage power line carrier module simulation detection device.
Background
In the field of intelligent power grid reading and controlling, large-scale automatic centralized meter reading and remote control construction are successively carried out on low-voltage power consumers by domestic and foreign power enterprises, and a large-scale low-voltage centralized meter reading network is also constructed by two power grid companies, namely a power grid and a national power grid in the south of China. The low-voltage power line carrier communication can be directly used for the power line network without additionally increasing the labor cost and the material cost, and the like, so that the low-voltage power line carrier communication is widely applied to the low-voltage meter reading construction. However, due to the fact that carrier chips, communication modules, metering meters, integrated meter reading and other equipment suppliers involved in carrier communication meter reading are numerous and different in technical level, and the influence of the complexity of a domestic power utilization network on the carrier communication quality is combined with the above factors, the ideal degree of the actual meter reading effect of centralized meter reading of power enterprises in various regions has great difference, and the meter reading effect is difficult to assess.
In order to strictly control the quality of the meter reading communication equipment, carrier communication laboratories are built in part of provincial power enterprises to carry out network access detection on related modules. However, these tests are only performed for checking and testing the compatibility of the structural size, power loss, functions, and the like of the module, and usually a single module is used as a test object, and the test cannot be performed on the entire carrier communication network, so that the actual overall use effect after networking cannot be examined.
Disclosure of Invention
Aiming at the problem that the prior art takes a single module as a test object and cannot integrally test the whole carrier communication network, so that the actual integral use effect after networking cannot be inspected, the invention establishes a low-voltage power line carrier communication simulation detection network system, namely a low-voltage power line carrier module simulation detection device.
The invention is realized by adopting the following technical scheme: the low-voltage power carrier module simulation detection device comprises a three-phase power distribution cabinet, a concentrator communication cabinet, seven carrier meter communication cabinets which are identical in structure and arranged in sequence, a master station (not shown in figure 1) which is communicated with the concentrator communication cabinet and is provided with meter reading detection software, and a control computer for controlling the concentrator communication cabinet and each carrier meter communication cabinet, wherein the three-phase power distribution cabinet provides main power supply for the concentrator communication cabinet and each carrier meter communication cabinet, and a 220V power supply provides measurement and special equipment power supply for the concentrator communication cabinet and each carrier meter communication cabinet.
The carrier meter communication cabinet comprises a delay switch, a power isolation module, an artificial power network module, a five-path synthesizer, a program-controlled attenuator, a frequency spectrograph and a multi-meter-position carrier meter frame; the three-phase power distribution cabinet is connected with a delay switch, the delay switch is connected with a power isolation module, the power isolation module is connected with an artificial power network module, the artificial power network module is connected with a multi-epitope carrier meter frame and a first path of a five-path synthesizer (the function of each path of the five-path synthesizer is well known by the technical personnel in the field, in order to distinguish the five paths, the artificial power network module is defined into the first path, the second path and the … … fifth path according to the description sequence, the second path of the five-path synthesizer is connected with a programmable attenuator, the third path (network cable) of the five-path synthesizer is connected with a frequency spectrograph, and the fourth path of the five-path synthesizer is connected with the programmable attenuator in the next adjacent carrier.
The concentrator communication cabinet comprises a delay switch, a power isolation module, an artificial power network module, a three-way synthesizer, a noise source module, a frequency spectrograph and a concentrator frame; the three-phase power distribution cabinet is connected with a delay switch, the delay switch is connected with a power isolation module, the power isolation module is connected with an artificial power network module, the artificial power network module is connected with a concentrator frame and a first path of a three-path synthesizer, a second path of the three-path synthesizer is connected with a program-controlled attenuator of a first carrier meter communication cabinet, a third path (network cable) of the three-path synthesizer is connected with a frequency spectrograph, and a noise source module is respectively connected with a fifth path of a five-path synthesizer of each carrier meter communication cabinet.
The control computer is connected with the program control attenuators of the carrier meter communication cabinets through an RS485 bus, connected with the noise source module and the frequency spectrograph of the concentrator communication cabinet through network cables, and connected with the frequency spectrograph of each carrier meter communication cabinet through network cables.
When the device is used, the tested device concentrator and the carrier electric energy meter are respectively connected to the concentrator frame and the carrier meter frame with multiple epitopes. The signal transmission path of the low-voltage power carrier module analog detection device is as follows: after entering a three-way synthesizer through an artificial power network module of a concentrator communication cabinet, a signal sent by the concentrator is respectively sent to a frequency spectrograph (for display) of the concentrator communication cabinet and a programmable attenuator of a first carrier meter communication cabinet, the signal is sent to a five-way synthesizer of the first carrier meter communication cabinet after passing through the programmable attenuator of the first carrier meter communication cabinet, and the signal sent to the five-way synthesizer of the first carrier meter communication cabinet is divided into three ways: one path enters an artificial power supply network module of a first carrier meter communication cabinet, then enters a multi-meter-position carrier meter frame of the first carrier meter communication cabinet, the other path enters a frequency spectrograph of the first carrier meter communication cabinet for displaying, and the other path enters a program-controlled attenuator of the next adjacent carrier meter communication cabinet; the transmission path of the signal in the next adjacent carrier meter communication cabinet is the same as that of the first carrier meter communication cabinet, and so on until the last carrier meter communication cabinet; and simultaneously, a noise source module of the concentrator communication cabinet sends noise signals to the five paths of synthesizers of the carrier meter communication cabinets respectively. The control computer controls the program-controlled attenuators in the carrier meter communication cabinets through the RS485 bus, controls the noise source module in the concentrator communication cabinet, the concentrator communication cabinet and the frequency spectrometers in the carrier meter communication cabinets, and transmits data with the concentrator communication cabinet and the frequency spectrometers in the carrier meter communication cabinets. The signal transmission path is reversible, so that signal transmission from the carrier meter rack of the multi-meter position to the concentrator rack is realized.
The artificial power supply network module decouples and separates the carrier signal from a power supply between the low-voltage meter reading concentrator and the electric energy meter; the program-controlled attenuator applies attenuation with a certain amplitude to the separated communication signals, the noise source module applies narrowband and broadband noise interference to simulate impedance and various interference signals generated by a power line and electric equipment in an actual communication line, and finally the communication signals are coupled to a power supply through the power network module and input to the equipment to be tested through a main power supply line to complete communication between the low-voltage meter reading concentrator and the electric energy meter.
The power isolation module is used for inhibiting high-frequency and low-frequency interference signals contained in the power supply, weakening the influence of environmental noise on the test circuit, improving the electrical isolation performance between the input power supply and the output power supply and protecting a subsequent control loop.
The artificial power supply network with the conduction bandwidth of 10 kHz-30 MHz provides uniform and stable 50-ohm impedance for the detection network, further isolates interference signals from a power grid from a test circuit, and decouples carrier signals of tested equipment (a low-voltage concentrator and a carrier electric energy meter) to a test line, or couples the carrier signals subjected to attenuation and interference to the tested equipment through the test line.
The programmable attenuator can adjust the signal level of the measurement line in 1dB steps without interrupting the circuit to adjust the power level in the test system.
The low-voltage power carrier module simulation detection device can realize the following detection functions:
firstly, meter reading efficiency detection, wherein parameters such as meter reading success rate, average meter reading times, meter reading data response time and the like in different environments can be respectively inspected under the background environment, the gradual attenuation increasing condition and the noise signal injection condition with the support of meter reading detection software of a main station, so that the meter reading efficiency of the whole simulation platform area can be detected.
Secondly, detecting the signal receiving sensitivity, gradually increasing the signal attenuation amplitude in the communication process, searching the critical value of the maximum meter reading attenuation, setting the maximum peak value holding of the spectrum instrument, sending a broadcast time setting command without a return frame to the ammeter by the concentrator, recording the signal amplitude of the spectrum instrument, recording the signal amplitude as the carrier receiving sensitivity, and taking a mathematical average value to avoid the time-varying contingency of carrier communication.
And thirdly, detecting the networking time of the route and clearing the existing route information in the concentrator. And resetting parameters of a measuring point in the concentrator, recording the issuing completion time as the starting time of routing networking, periodically and continuously reading the electric meter data, and recording the networking completion time when the success rate of reading the data reaches over 90 percent. And calculating the time difference between the ending time and the starting time, and recording the time difference as the routing networking time.
And fourthly, detecting the relay depth of the route, gradually increasing attenuation amplitude between the concentrator and each level of electric meters, searching a critical value of the maximum attenuation, arranging the critical value of the maximum attenuation on each level of attenuator, and verifying the existence and the depth of the relay relation of the route by starting and stopping the previous level of electric meters and whether the next level of electric meters can successfully copy the data.
Frequency hopping communication detection, wherein a carrier communication center frequency point adopts a fixed frequency point and is easily influenced by the interference of the power grid environment, so that carrier communication center frequency points are changed into two or even more frequencies by some carrier manufacturers. Under the condition that the main frequency is interfered by noise, the auxiliary frequency point can be automatically jumped in to avoid the noise and improve the success rate of communication. The frequency hopping communication capability of the carrier module can be verified through the technologies of band-pass attenuation, band-pass amplification noise and the like.
Detection of routing path selectionIn order to adapt to the complexity and time-varying property of the power grid environment, a carrier communication network is generally designed to have a complex routing path algorithm. In order to test the adaptive capacity of the carrier communication routing path, the original path direction cannot be reached by applying interference and attenuation among original paths, and whether the carrier networking can reach a target node through other routing path directions is tested. As shown in FIG. 2, it is originally
Between paths, a certain amount of interference and attenuation is applied, so that nodes
To node
The path block can not reach, and whether the communication can pass or not is detected
Or other paths, and the time required for changing the path is considered.
The routing node change detection scheme is characterized in that a new ammeter node is added in an existing carrier network, whether the newly added node can be automatically added into the existing carrier network communication is detected, time for the newly added node to be added into the network is considered, and whether node information in routing information can be removed and the removal time of the node information is detected through deletion of the node, so that the conversion capacity of a node routing path is influenced.
And the test process adopts multiple tests, and the test result values are averaged.
The invention aims to establish a low-voltage power line carrier communication simulation detection simulation network system, which takes the whole carrier communication network as a general object, simulates the application process of carrier communication meter reading, realizes the in-network simulation detection analysis of carrier modules of different models based on the actual application result, tests the actual meter reading effect of each module meter reading network under the conditions of different signal interference and attenuation levels, and realizes the detection of the carrier modules by transversely comparing various performance indexes of the carrier communication modules of different models, thereby realizing the comparison and effect judgment of the carrier communication modules of different manufacturers and the meter reading performance thereof, and providing an effective basis for screening and selecting high-quality and high-efficiency communication products in the process of establishing a centralized meter reading system for power enterprises. The invention has novel and unique structural design.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a diagram illustrating detection of routing path selection.
Detailed Description
The low-voltage power carrier module simulation detection device comprises a three-phase power distribution cabinet, a concentrator communication cabinet M1, seven carrier meter communication cabinets S1-S7 which are identical in structure and are sequentially arranged, a master station (not shown in figure 1) which is communicated with the concentrator communication cabinet and is provided with meter reading detection software, and a control computer for controlling the concentrator communication cabinet and each carrier meter communication cabinet, wherein the three-phase power distribution cabinet provides main power supply for the concentrator communication cabinet and each carrier meter communication cabinet, and a 220V power supply provides measurement and special equipment using power supply for the concentrator communication cabinet and each carrier meter communication cabinet.
The carrier meter communication cabinet comprises a delay switch, a power isolation module, an artificial power network module, a five-path synthesizer, a program-controlled attenuator, a frequency spectrograph and a multi-meter-position carrier meter frame; the three-phase power distribution cabinet is connected with a delay switch, the delay switch is connected with a power isolation module, the power isolation module is connected with an artificial power network module, the artificial power network module is connected with a multi-epitope carrier meter frame and a first path of a five-path synthesizer (the function of each path of the five-path synthesizer is well known by the technical personnel in the field, and in order to distinguish the five paths for convenient description, the artificial power network module is defined into the first path, a second path and an … … fifth path according to the description sequence, the second path of the five-path synthesizer is connected with a programmable attenuator, the third path (network cable) of the five-path synthesizer is connected with a frequency spectrograph, and the fourth path of the five-path synthesizer is connected with the programmable attenuator in the next adjacent.
The concentrator communication cabinet comprises a delay switch, a power isolation module, an artificial power network module, a three-way synthesizer, a noise source module, a frequency spectrograph and a concentrator frame; the three-phase power distribution cabinet is connected with a delay switch, the delay switch is connected with a power isolation module, the power isolation module is connected with an artificial power network module, the artificial power network module is connected with a concentrator frame and a first path of a three-path synthesizer (the definition of each path of the three-path synthesizer is the same as that of the five-path synthesizer), a second path of the three-path synthesizer is connected with a program-controlled attenuator of a first carrier meter communication cabinet, a third path (network cable) of the three-path synthesizer is connected with a frequency spectrograph, and a noise source module is respectively connected with a fifth path of the five-path synthesizer of each carrier.
The control computer is connected with the program control attenuators of the carrier meter communication cabinets through an RS485 bus, connected with the noise source module and the frequency spectrograph of the concentrator communication cabinet through network cables, and connected with the frequency spectrograph of each carrier meter communication cabinet through network cables.
The noise source module of the concentrator communication cabinet consists of a white noise generator, an adjustable attenuator and a multi-path coupler. The white noise generator is composed of a narrow-band white noise generator and a wide-band white noise generator, the narrow-band white noise generator can generate white noise of 20 Hz-100 kHz, the wide-band white noise generator can generate white noise of 100 kHz-30 MHz, the communication frequency band adopted by manufacturers of low-voltage meter reading carrier chips in China at present is covered, and effective interference can be generated on target test signals. The carrier frame with multiple epitopes is a carrier frame with 72 epitopes.
The constituent modules or components of the concentrator and carrier meter cabinets are known in the prior art or product. The three-path synthesizer and the five-path synthesizer are commercially available products produced by Beijing Daze technologies GmbH.
Claims (3)
1. A low-voltage power carrier module simulation detection device is characterized by comprising a three-phase power distribution cabinet, a concentrator communication cabinet (M1), seven carrier meter communication cabinets (S1-S7) with the same structure and arranged in sequence, a master station which is communicated with the concentrator communication cabinet and is provided with meter reading detection software, and a control computer for controlling the concentrator communication cabinet and each carrier meter communication cabinet, wherein the three-phase power distribution cabinet provides main power supply for the concentrator communication cabinet and each carrier meter communication cabinet, and a 220V power supply provides measurement and special equipment use power supply for the concentrator communication cabinet and each carrier meter communication cabinet;
the carrier meter communication cabinet comprises a delay switch, a power isolation module, an artificial power network module, a five-path synthesizer, a program-controlled attenuator, a frequency spectrograph and a multi-meter-position carrier meter frame; the three-phase power distribution cabinet is connected with a delay switch, the delay switch is connected with a power isolation module, the power isolation module is connected with an artificial power network module, the artificial power network module is connected with a multi-epitope carrier meter frame and a first path of a five-path synthesizer, a second path of the five-path synthesizer is connected with a programmable attenuator, a third path of the five-path synthesizer is connected with a frequency spectrograph, and a fourth path of the five-path synthesizer is connected with a programmable attenuator in an adjacent next carrier meter communication cabinet;
the concentrator communication cabinet comprises a delay switch, a power isolation module, an artificial power network module, a three-way synthesizer, a noise source module, a frequency spectrograph and a concentrator frame; the three-phase power distribution cabinet is connected with a delay switch, the delay switch is connected with a power isolation module, the power isolation module is connected with an artificial power network module, the artificial power network module is connected with a concentrator frame and a first path of a three-path synthesizer, a second path of the three-path synthesizer is connected with a program-controlled attenuator of a first carrier meter communication cabinet, a third path of the three-path synthesizer is connected with a frequency spectrograph, and a noise source module is respectively connected with a fifth path of a five-path synthesizer of each carrier meter communication cabinet;
the control computer is connected with the program control attenuators of the carrier meter communication cabinets through an RS485 bus, connected with the noise source module and the frequency spectrograph of the concentrator communication cabinet through network cables, and connected with the frequency spectrograph of each carrier meter communication cabinet through network cables.
2. The analog testing device of claim 1, wherein the noise source module of the concentrator communication cabinet is comprised of a white noise generator, an adjustable attenuator, and a multi-way coupler.
3. The analog detecting device of low-voltage power carrier module as claimed in claim 2, wherein the white noise generator is composed of a narrow-band white noise generator for generating white noise of 20Hz to 100kHz and a wide-band white noise generator for generating white noise of 100kHz to 30 MHz.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108023613A (en) * | 2017-10-31 | 2018-05-11 | 杭州华立电力系统工程有限公司 | Carrier communication module detection device and carrier communication module detection method |
| 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 |
| CN108768451B (en) * | 2018-04-28 | 2021-07-20 | 华立科技股份有限公司 | Power line carrier integrated test system and test method |
| CN110995314A (en) * | 2019-12-05 | 2020-04-10 | 国网天津市电力公司电力科学研究院 | Low-voltage broadband power line carrier communication comprehensive test system |
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| US9615270B2 (en) * | 2013-11-04 | 2017-04-04 | State Grid Corporation Of China | Intelligent power utilization communication product detecting system |
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