CN110493063B - Power line carrier multistage networking test system based on distributed noise injection and wireless connection - Google Patents
Power line carrier multistage networking test system based on distributed noise injection and wireless connection Download PDFInfo
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Abstract
The invention discloses a power line carrier multistage networking test system based on distributed noise injection and wireless connection, which comprises: the central control unit is communicated with each test unit and the routing attenuator networks; the local side test unit is used for testing local side tested carrier equipment, and the local side tested carrier equipment is used as a central node of a network in a carrier communication network; the meter end testing unit is used for testing the meter end tested carrier equipment as a relay node or a terminal node of the network; the routing attenuator network is used as a carrier communication route of the local side test unit and the meter side test unit, and each routing attenuator network can be connected with a plurality of test units; the noise injection module is arranged in each test unit of the plurality of local side test units and the plurality of meter side test units, and the noise injection module is coupled to a carrier interface of tested carrier equipment of the test unit.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a power line carrier multistage networking test system based on distributed noise injection and wireless connection.
Background
Low voltage power line broadband carrier (LVPLC) communication is a special communication mode for voice or data transmission using low voltage power distribution lines (380/220V subscriber lines) as information transmission media. The technology is that high frequency signal carrying information is loaded on current, then it is transmitted by various grades of power line, the modem receiving information separates the high frequency signal from the current, and transmits it to the broadband user terminal (computer, television or telephone set and intelligent electric meter, switch, station changer). The technology realizes the bearing of multiple services such as data, voice, video and the like on the existing wire on the basis of no need of rewiring. The working frequency of a common high-speed power line carrier is 0.7-12M, an OFDM modulation mode is adopted, a multi-level ad hoc network is supported, and the communication rate exceeds 1 Mbps.
In an actual carrier communication network, due to the influence of a power line carrier environment and the limit values of the sending power and the receiving sensitivity of carrier communication equipment, two carrier communication nodes may not realize direct communication, hierarchical ad hoc networking is required according to a carrier communication protocol, the network is divided into different relay levels, a central coordinator maintains the whole carrier communication network, and cross-level communication is realized by forwarding carrier communication messages through the relay nodes. For example, the central node may directly communicate with the first-level network node, the second-level network node communicates with the central node, and the relay of the signal needs to be performed through the proxy node in the first level, and so on, so as to implement a multi-level network topology, and each node in the trial network can transmit data to each other. In order to test the carrier multi-level networking communication and verify the reliability and networking stability of a networking algorithm, an actual power line environment needs to be simulated, and a power line carrier multi-level networking test system is built for verifying the communication and ad hoc networking capability of the tested carrier equipment. The multi-level networking test system has the main task that physical star-shaped, linear and tree-shaped network topologies are formed according to test requirements, so that tested power line carrier equipment can be classified according to the physical topologies, adjacent carrier communication can be directly connected, and non-adjacent carrier communication carries out inter-level relay communication according to a carrier communication protocol. And forming a power line carrier communication network similar to the field environment through hierarchical networking.
Ideally, the carrier signal only propagates along the carrier line, but the carrier signal is an electromagnetic signal whose characteristics conform to the description of Maxwell's equations, the oscillating electric field can generate an oscillating magnetic field, the energy of which can propagate through space, and spatial radiation and conduction of the carrier signal can be observed between devices with close spatial distance, and even if two carrier devices are not physically connected, the two carrier devices can communicate with each other.
The traditional power line carrier multilevel networking test system mainly comprises a shielding box, an internal test circuit board, a centralized switch matrix, a program-controlled attenuator, an interconnection cable and the like. Because the space distance of each test unit of the multi-stage networking test system is relatively close, a shielding box is required to shield carrier signals conducted in the space, otherwise, network topology disorder is caused, and therefore the shielding box is required to be formed by the traditional power line carrier networking test system. Meanwhile, the tested carrier equipment is positioned in each carrier shielding box to form a test unit, the centralized switch matrix is connected with each test unit by using a signal cable, and the physical topology of the carrier network is changed through the centralized switch matrix and the programmable attenuator. And all the devices such as the programmable attenuator and the switch matrix are controlled through wired connection such as Ethernet or 485 buses. The traditional power line carrier multilevel networking test system is typically composed as shown in fig. 1, and a PC controls a switch matrix, a programmable attenuator and each test unit through Ethernet, and changes the physical topology of a carrier network through the switch matrix and the programmable attenuator. Each test unit is positioned in a shielding box to shield inter-stage coupling crosstalk. It should be noted that fig. 1 is only a schematic diagram, and not all shielding boxes are shown.
However, the conventional power line carrier multi-level networking test system has the following two disadvantages: firstly, the configurable hierarchical topology is limited, and secondly, the wired connection mode easily causes carrier signal crosstalk, thereby causing hierarchical confusion. The traditional power line carrier multi-level networking test system composition structure causes cost increase and required space increase of test environment construction, is limited by space and shielding box quantity, and the test scale is generally limited within 300.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide a power line carrier multilevel networking test system based on distributed noise injection and wireless connection, which can realize carrier network grading without shielding a spatial coupling signal by a traditional shielding box.
In order to achieve the above object, the present invention provides a power line carrier multi-level networking test system based on distributed noise injection and wireless connection, comprising: the system comprises a central control unit, a plurality of local side test units, a plurality of meter side test units and a plurality of routing attenuator networks, wherein the central control unit is communicated with the plurality of local side test units, each test unit in the plurality of meter side test units and the plurality of routing attenuator networks so as to control the operation of the power line carrier multistage networking test system; the local side test unit is used for testing local side tested carrier equipment, and the local side tested carrier equipment is used as a central node of a network in a carrier communication network so as to maintain carrier network communication; the meter end test unit is used for testing meter end tested carrier equipment, and the meter end tested carrier equipment is used as a relay node or a terminal node of the network in the carrier communication network so as to be responsible for relay communication and terminal data transmission; the routing attenuator network is used as a carrier communication route of the local side test unit and the meter side test unit, each routing attenuator network can be connected with a plurality of test units and can switch the communication attenuation degree between adjacent carrier nodes; and each test unit in the plurality of local side test units and the plurality of meter side test units is internally provided with a noise injection module, and the noise injection module is coupled to a carrier interface of the tested carrier equipment of the test unit and used for testing the anti-noise capability of the carrier communication.
In a preferred embodiment, the noise injection module can emit white noise, narrow-band noise, impulse noise or noise waveforms recorded from the field, and the noise injection module includes a communication interface, a control module, an FPGA, a FLASH memory, a DAC digital-to-analog conversion module, and a PA power amplifier.
In a preferred embodiment, the central control unit includes a PC, a wireless communication module connected to the PC, a high-pass filter, and a communication antenna, wherein the PC is used to run control software of the power line carrier multilevel networking test system, the external communication of the central control unit is performed through the antenna module, and the wireless communication module of the central control unit is used as a central node of a wireless control network to coordinate networking communication of all wireless communication modules in the power line carrier multilevel networking test system.
In a preferred embodiment, each local side test unit includes a main control module, a wireless communication module, a noise injection module, a battery power supply module, an interface module, and a filter, and the local side test unit leads out a communication antenna interface and a test device carrier interface, wherein the main control module communicates with the central control unit through wireless communication to control the tested device communication interface and the noise injection module inside the local side test unit, the communication antenna interface is used for connecting a communication antenna, the communication antenna is used as a data transceiving channel of a wireless control network, the test device carrier interface is used for leading out a carrier signal of the local side tested carrier device to the local side test unit, the communication antenna interface is connected with a high pass filter, and the test device carrier interface is connected with a low pass filter.
In a preferred embodiment, the noise injection module is controlled by the main control module, a communication interface inside the noise injection module is connected to the main control module of the local side test unit to receive a control instruction issued by the main control module, the control instruction is transmitted to the control module inside the noise injection module, the control module analyzes the control instruction, according to the setting of the main control module, the FPGA inside the noise injection module is controlled to generate a corresponding digital noise excitation signal, the DAC digital-to-analog conversion module converts the digital noise excitation signal into an analog noise signal and sends the analog noise signal to the PA power amplifier, and the PA power amplifier amplifies the analog noise signal to a specified power and then injects the analog noise signal to a carrier interface of the local side measured carrier device.
In a preferred embodiment, the local side measured carrier device is a concentrator carrier communication module, the measured device communication interface is matched with the communication interface of the local side measured carrier device, and the measured device carrier interface is matched with the carrier interface of the local side measured carrier device.
In a preferred embodiment, the meter-end tested carrier device is a single/three-phase electric energy meter carrier communication module, a test interface of the meter-end test unit is matched with the tested meter-end communication module, and the meter-end test unit has a virtual electric energy meter function to support the copying of a plurality of electric energy meter data items and can generate an electric energy meter event report signal.
In a preferred embodiment, each routing attenuator network includes a main control module, a wireless communication module, a power distribution module, a plurality of digital attenuation modules, and an external interface, the external interface includes a communication antenna interface and a multi-channel carrier interface, the communication antenna interface is connected with a high-pass filter, the carrier interface is connected with a low-pass filter, and a battery power supply module is disposed in the routing attenuator network.
In a preferred embodiment, the main control module of the route attenuator network is connected to the central control unit through the wireless communication module, and is controlled by the central control unit to switch different attenuation values and connection modes, and the power distribution module can cut off signals of certain paths or connecting certain paths of carrier interfaces, so as to control the conduction path and strength of carrier signals.
In a preferred embodiment, different network topologies are modified through the routing attenuator network, when the routing attenuator network adopts a star network, all channels of the routing attenuator network are opened, the attenuation of a carrier channel is 0, and all test units are in the same network level; when the routing attenuator network adopts a linear network, adjusting carrier channels of the routing attenuator network to enable each test unit to be an independent network level, enabling adjacent test unit carrier communication to be direct, and enabling non-adjacent test unit carrier communication to need relaying; when the routing attenuator network adopts a tree network, the carrier channels of the routing attenuator network are adjusted to enable a plurality of test units to be in a network level, adjacent network level carrier communication can be directly achieved, and non-adjacent network level carrier communication needs to be relayed.
Compared with the prior art, the power line carrier multilevel networking test system based on distributed noise injection and wireless connection has the following advantages: (1) the noise injection module is arranged in each test unit, and the signal-to-noise ratio of the carrier wave received by the tested carrier wave equipment of the test unit can be reduced by a noise injection method, so that the spatial coupling of the carrier wave signals can be prevented without a shielding box, and the topological classification of the carrier wave network is realized; (2) the central control unit controls each test unit and the routing attenuator network in a wireless communication mode, cuts off a carrier signal conduction path formed by a control line and prevents carrier signals from being conducted in a cross-stage mode through the control line; (3) the carrier signals among the test units are connected through the routing attenuator network, the physical topology of the carrier network can be changed through the routing attenuator network, different network environments are simulated, and the test system is flexible and changeable.
Drawings
FIG. 1 is a block diagram of a typical component of a conventional power line carrier multi-stage networking test system;
fig. 2 is a block diagram of a power line carrier multi-stage networking test system according to an embodiment of the invention;
FIG. 3 is a graph of the characteristics of an ideal case carrier signal;
fig. 4 is a characteristic diagram of a carrier signal in a conventional practical environment;
FIG. 5 is a characteristic diagram of a carrier signal injected by noise according to an embodiment of the present invention;
FIG. 6 is a block diagram of a noise injection module according to an embodiment of the present invention;
FIG. 7 is a Gaussian white noise signal spectrum;
FIG. 8 is an actual power line noise spectrum;
FIG. 9 is a block diagram of a central control unit according to an embodiment of the present invention;
fig. 10 is a block diagram of a configuration of an office test unit according to an embodiment of the present invention;
FIG. 11 is a block diagram of a table side test unit according to an embodiment of the invention;
FIG. 12 is a block diagram of the structure of a routing attenuator network according to an embodiment of the present invention;
fig. 13a is a schematic diagram of a power line carrier multilevel networking test system connected in a star network manner according to an embodiment of the invention;
fig. 13b is a schematic diagram of a power line carrier multilevel networking test system according to an embodiment of the invention, which is connected in a linear network manner;
fig. 13c is a schematic diagram of a power line carrier multi-stage networking test system connected in a tree network manner according to an embodiment of the invention.
Detailed Description
The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
As shown in fig. 2, the power line carrier multi-stage networking test system based on distributed noise injection and wireless connection according to the preferred embodiment of the present invention includes: the system comprises a central control unit 101, a plurality of local side test units 102, a plurality of table side test units 103 and a plurality of routing attenuator networks 104, wherein carrier test paths among all components are connected through radio frequency connecting lines and used for networking communication of tested carrier equipment, and a control path adopts a wireless communication mode.
In the above scheme, the central control unit communicates with the plurality of local side test units, each test unit in the plurality of table side test units, and the plurality of routing attenuator networks to control the operation of the power line carrier multi-level networking test system, and the attenuation relationship among the test units is changed by controlling the routing attenuator networks, so that the physical network topology is changed, and the central control unit is the most important control unit of the whole system. The local side test unit is used for testing local side tested carrier equipment, and the local side tested carrier equipment in the carrier communication network is used as a central node of the network to maintain carrier network communication. The meter end test unit is used for testing the meter end tested carrier equipment, and the meter end tested carrier equipment is used as a relay node or a terminal node of the network in the carrier communication network so as to be responsible for relay communication and terminal data transmission. The routing attenuator network is used as a carrier communication route of the local side test unit and the meter side test unit, each routing attenuator network can be connected with a plurality of test units, can switch the communication attenuation degree between adjacent carrier nodes, can realize the power distribution of multi-channel carriers, realizes the carrier communication route selection and changes the physical topology of the carrier transmission network.
And wherein, each test unit in a plurality of local side test units, a plurality of table end test unit embeds there is the noise injection module, and the noise injection module is coupled to the carrier interface of the carrier equipment under test of this test unit for test carrier communication's anti-noise ability, utilizes the mode of noise injection to offset the crosstalk of space radiation, thereby realizes space signal isolation under the environment that need not the shielded cell.
The schematic diagram of the whole carrier networking test system is shown in fig. 2, the local side test unit and the meter side test unit are respectively used for testing local side carrier equipment and meter side carrier equipment, the routing attenuator network is used as a carrier communication route of each test unit, each routing attenuator network can be connected with a plurality of test units, and the carrier communication attenuation and the mutual physical connection relationship among the test units can be adjusted. It should be noted that fig. 2 only depicts a part of test units, which is only a connection schematic of the whole system, and in actual system implementation, the number of the test units and the routing attenuator network can be increased according to the test requirements to build enough test units for network classification test.
The method for realizing carrier network classification by noise injection in the scheme is described in detail as follows:
as shown in fig. 3, in an ideal environment, the spatial attenuation of the electromagnetic wave is infinite, and the characteristics of the carrier signal are shown in the figure, which represent the signal conditions inside the three test units, respectively, with the abscissa representing the frequency and the ordinate representing the power. The background noise power spectral density of each test unit is assumed to be-110 dBm/Hz, the carrier transmitting power spectral density is-40 dBm/Hz, the attenuation value of the inter-stage attenuator is 40dB, and the receiving sensitivity of the carrier receiver is 3 dB. The carrier test unit 1 sends out a carrier signal, the signal-to-noise ratio of a signal received by the test unit 2 is 30dB, the signal-to-noise ratio of a signal received by the test unit 3 is-10 dB, and the signal is submerged by noise and exceeds the capability of a carrier receiver. That is, the test unit 2 can directly communicate with the test unit 1, and the test unit 3 needs to relay through the test unit 2 to communicate with the test unit 1, thereby realizing carrier network classification.
However, in practical environments, the spatial attenuation of electromagnetic waves is not infinite. The background noise power spectral density of each test unit is assumed to be-110 dBm/Hz, the carrier transmitting power spectral density is-40 dBm/Hz, the attenuation value of an inter-stage attenuator is 40dB, the spatial signal isolation is 60dB, and the minimum receiving signal-to-noise ratio of a carrier receiver is required to be 3 dB.
As shown in fig. 4, the carrier test unit 1 sends out a carrier signal, the signal power coupled to the test unit 2 and the test unit 3 through space is-100 dBm/Hz, after the carrier signal is superimposed with the signal passing through the signal attenuator, the signal to noise ratio of the signal received by the test unit 2 is 30dB, and the signal to noise ratio of the signal received by the test unit 3 through space coupling is 10 dB. The receiving signal-to-noise ratio of the test unit 3 is greater than the receiving sensitivity of the test unit 3, that is, the test unit 3 can also directly communicate with the test unit 1, and carrier network classification cannot be realized. The traditional method adopts a shielding box to improve the spatial isolation degree and reduce the influence of spatial coupling signals on receiving, so that the received signals are similar to the ideal situation, thereby realizing classification.
As shown in fig. 5, the present invention improves the noise floor of each receiving unit by noise injection. For example, under the above assumptions, the background noise power spectral density of each test unit is raised to-90 dBm/Hz. Under the condition that the testing unit 1 sends out a power spectral density signal of-40 dBm/Hz, the signal to noise ratio of the signal received by the testing unit 2 is 10dB, and the signal to noise ratio of the signal received by the testing unit 3 is-10 dB. The test unit 3 will not be able to communicate directly with the test unit 1, so that no physical shielding box is needed to implement the classification of the carrier network topology, i.e. the test unit 3 needs to communicate with the test unit 1 via the relay of the test unit 2.
The invention discloses a power line carrier multistage networking test system, which comprises the following components in structure:
as shown in fig. 6, the noise injection module of the present invention can emit white noise to improve the carrier communication background noise in the unit, reduce the carrier signal-to-noise ratio, and facilitate carrier network topology classification; various types of signals can be emitted, such as narrow-band noise, impulse noise, or noise waveforms recorded from the Field, and the noise injection module includes a communication interface, a control module, an FPGA (Field-Programmable Gate Array), a FLASH memory, a DAC digital-to-analog conversion module, and a PA power amplifier. The FPGA of the noise injection module is externally connected with a power-down nonvolatile FLASH memory and is used for storing an excitation data source required for generating a noise signal, storing actually recorded power line noise signal data or Gaussian white noise signal data generated by software and outputting different noise signals according to different test requirements.
For example, the gaussian white noise signal spectrum is shown in fig. 7, and the power spectral density and the amplitude distribution of the gaussian white noise signal spectrum are uniformly distributed and cover all carrier communication frequency bands. The actual power line noise spectrum is as shown in fig. 8, the in-band spectrum is not flat, is related to the electrical load of the field power line installation, has a time-varying characteristic, has no obvious rule, and needs to be collected and recorded on the field.
As shown in fig. 9, the central control unit 101 includes a PC, a wireless communication module connected to the PC, a high-pass filter, and a communication antenna, where the PC is used to run control software of the power line carrier multi-stage networking test system, external communication of the central control unit is performed through the antenna module, and the wireless communication module of the central control unit is used as a central node of a wireless control network to coordinate networking communication of all wireless communication modules in the power line carrier multi-stage networking test system.
As shown in fig. 10, each office test unit 102 includes a main control module, a wireless communication module, a noise injection module, a battery power supply module, an interface module, and a filter, and the office test unit is led out of a communication antenna interface and a test equipment carrier interface, the main control module communicates with the central control unit through wireless communication to control a tested device communication interface and a noise injection module inside the local side test unit, the communication antenna interface is used for being connected with a communication antenna, the communication antenna is used as a data receiving and transmitting channel of a wireless control network, the test device carrier interface is used for leading carrier signals of local side tested carrier devices out of the local side test unit, the communication antenna interface is connected with a high-pass filter to prevent the carrier signals from radiating outwards from the antenna interface, and the test device carrier interface is connected with a low-pass filter to prevent the wireless signals from influencing carrier communication. The typical carrier device to be tested at the local side is a concentrator carrier communication module, and the main control module communicates with the central control unit through wireless communication to control a communication interface and a noise injection module in the local side test unit. The communication interface of the tested equipment is matched with the communication interface of the carrier equipment to be tested at the local side, and the carrier interface of the tested equipment is matched with the carrier interface of the carrier equipment to be tested at the local side. The main control module can control the working state of the tested device through the communication interface of the tested device.
The noise injection module is controlled by a main control module of the test unit, a communication interface inside the noise injection module is connected to the main control module of the local side test unit to receive a control instruction issued by the main control module, the control instruction is transmitted to a control module inside the noise injection module, the control module analyzes the control instruction, an FPGA inside the noise injection module is controlled to generate a corresponding digital noise excitation signal according to the setting of the main control module, a DAC (digital-to-analog converter) module converts the digital noise excitation signal into an analog noise signal and sends the analog noise signal to a PA (power amplifier), and the PA power amplifier amplifies the analog noise signal to a specified power and then injects the analog noise signal to a carrier interface of a carrier device to be tested at the local side.
Fig. 11 is a block diagram of a structure of a meter end test unit, where the meter end test unit 103 is to test that a typical meter end tested carrier device of a meter end carrier device is a single/three-phase electric energy meter carrier communication module, and its internal composition and function are similar to those of a local end test unit, and is connected with a central control unit through wireless communication. The difference between the local side test unit and the tested equipment is that the tested equipment communication interface and the tested equipment carrier interface are arranged, the test interface of the meter side test unit is matched with the tested meter side communication module, and the meter side test unit has a virtual electric energy meter function so as to support the reading of a plurality of electric energy meter data items and generate an electric energy meter event report signal.
As shown in fig. 12, each of the routing attenuator networks 104 includes a main control module, a wireless communication module, a power distribution module, a plurality of digital attenuation modules, and an external interface, the external interface includes a communication antenna interface and a multi-channel carrier interface, the communication antenna interface is connected to a high-pass filter, the carrier interface is connected to a low-pass filter, which can prevent mutual interference between wireless signals and carrier communications, and a battery power supply module is disposed in the routing attenuator network, which can work independently from the power grid, and prevent mutual crosstalk between carrier signals through power lines.
The main control module of the routing attenuator network is connected with the central control unit through the wireless communication module and is controlled by the central control unit to switch different attenuation values and connection modes, the main control module can change the attenuation values among all carrier interfaces of the routing attenuator network by adjusting different digital attenuation modules in the routing attenuator network, and can cut off signals of some carrier interfaces or connect some carrier interfaces through the power distribution module to control the transmission path and the strength of carrier signals, thereby realizing different physical carrier network topologies.
As shown in fig. 13a-13c, the following is an example of modifying different network topologies by a routing attenuator network (shown with the office side test unit 102, the table side test unit 103, the routing attenuator network 104):
all channels of the star network and the route attenuator network are opened, the attenuation of the carrier channel is 0, and all the test units are in the same network level.
And in the linear network, the carrier channels of the routing attenuator network are adjusted to enable each test unit to be an independent network level, the carrier communication of adjacent test units can be directly transmitted, and the carrier communication of non-adjacent test units needs to be relayed.
And the tree network adjusts the carrier channels of the routing attenuator network to enable a plurality of test units to be in a network level, adjacent network level carrier communication can be directly achieved, and non-adjacent network level carrier communication needs to be relayed.
It should be noted that the star-type, line-type, and tree-type networks are typical test network topologies. In an actual network, carrier topology is varied, and simulation can be performed in the power line carrier multi-level networking test system provided by the proposal through different configurations of the routing attenuator network.
Each test unit and each routing attenuator network of the invention are provided with independent battery power supply modules, so that the whole system can work away from a power grid, a carrier signal conduction path formed by a power supply line can be cut off, and carrier signals are prevented from being conducted in a cross-stage mode through the power supply line.
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.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (10)
1. The utility model provides a power line carrier multistage network deployment test system based on distributed noise injection and wireless connection which characterized in that, power line carrier multistage network deployment test system includes: the system comprises a central control unit, a plurality of local side test units, a plurality of table side test units and a plurality of routing attenuator networks;
the central control unit is in wireless communication with the plurality of local end test units, each test unit in the plurality of meter end test units and the plurality of routing attenuator networks so as to control the operation of the power line carrier multistage networking test system;
the local side test unit is used for testing local side tested carrier equipment, and the local side tested carrier equipment is used as a central node of a network in a carrier communication network so as to maintain carrier network communication;
the meter end test unit is used for testing meter end tested carrier equipment, and the meter end tested carrier equipment is used as a relay node or a terminal node of a network in the carrier communication network so as to be responsible for relay communication and terminal data transmission;
the routing attenuator networks are used as carrier communication routes of the local side test unit and the table side test unit, each routing attenuator network can be wirelessly connected with a plurality of test units and can switch communication attenuation degrees between adjacent carrier nodes and control the transmission path and the strength of a carrier signal so as to obtain different carrier network topologies;
and each test unit of the plurality of local side test units and the plurality of meter side test units is internally provided with a noise injection module, and the noise injection module is coupled to a carrier interface of tested carrier equipment of the test unit and is used for improving the background noise of a receiving unit in each test unit, reducing the signal-to-noise ratio of a carrier signal and counteracting the crosstalk of space radiation so as to realize the classification of the carrier network topology.
2. The power line carrier multi-stage networking test system of claim 1, wherein the noise injection module is capable of emitting white noise, narrowband noise, impulse noise, or noise waveforms recorded from the field, the noise injection module comprising a communication interface, a control module, an FPGA, a FLASH memory, a DAC digital-to-analog conversion module, and a PA power amplifier.
3. The power line carrier multilevel networking test system of claim 2, wherein the central control unit comprises a PC, a wireless communication module connected to the PC, a high pass filter, and a communication antenna, wherein the PC is used to run control software of the power line carrier multilevel networking test system, the external communication of the central control unit is performed through the antenna module, and the wireless communication module of the central control unit is used as a central node of a wireless control network to coordinate networking communication of all wireless communication modules in the power line carrier multilevel networking test system.
4. The power line carrier multi-stage networking test system according to claim 3, wherein each of the local side test units comprises a main control module, a wireless communication module, a noise injection module, a battery power supply module, an interface module, and a filter, and the local side test units are led out a communication antenna interface and a test device carrier interface, wherein the main control module communicates with the central control unit through wireless communication to control the device under test communication interface and the noise injection module inside the local side test unit, the communication antenna interface is used for connecting a communication antenna, the communication antenna is used as a data transceiving channel of a wireless control network, the test device carrier interface is used for leading out a carrier signal of the local side device under test from the local side test unit, and the communication antenna interface is connected with a high pass filter, and a low-pass filter is connected at a carrier interface of the test equipment.
5. The power line carrier multi-stage networking test system of claim 4, the noise injection module is controlled by the main control module, a communication interface inside the noise injection module is connected to the main control module of the local side test unit, to receive the control instruction sent by the main control module, the control instruction is transmitted to the control module in the noise injection module, the control module analyzes the control instruction, controlling an FPGA in the noise injection module to generate a corresponding digital noise excitation signal according to the setting of the main control module, the DAC digital-to-analog conversion module converts the digital noise excitation signal into an analog noise signal, and sending the analog noise signal to the PA power amplifier, wherein the PA power amplifier amplifies the analog noise signal to a specified power and then injects the amplified analog noise signal to a carrier interface of the local side carrier device to be tested.
6. The power line carrier multi-stage networking test system according to claim 5, wherein the local-side tested carrier device is a concentrator carrier communication module, the communication interface of the tested device is matched with the communication interface of the local-side tested carrier device, and the carrier interface of the tested device is matched with the carrier interface of the local-side tested carrier device.
7. The power line carrier multi-stage networking test system according to claim 6, wherein the meter-end tested carrier device is a single/three-phase electric energy meter carrier communication module, a test interface of the meter-end test unit is matched with the tested meter-end communication module, and the meter-end test unit has a virtual electric energy meter function to support reading of a plurality of electric energy meter data items and to generate an electric energy meter event report signal.
8. The power line carrier multilevel networking test system of claim 1, wherein each of the routing attenuator networks comprises a main control module, a wireless communication module, a power distribution module, a plurality of digital attenuation modules, and an external interface, the external interface comprises a communication antenna interface and a multipath carrier interface, the communication antenna interface is connected with a high-pass filter, the carrier interface is connected with a low-pass filter, and a battery power supply module is arranged in the routing attenuator network.
9. The power line carrier multi-stage networking test system according to claim 8, wherein the main control module of the routing attenuator network is connected to the central control unit through the wireless communication module and is controlled by the central control unit to switch different attenuation values and connection modes, and the power distribution module can cut off signals of several paths or connect several paths of carrier interfaces, so as to control the transmission path and strength of carrier signals.
10. The power line carrier multilevel networking test system of claim 9, wherein different network topologies are modified by the routing attenuator network, when the routing attenuator network adopts a star network, all channels of the routing attenuator network are opened, the attenuation of the carrier channel is 0, and all test units are in the same network level; when the routing attenuator network adopts a linear network, adjusting a carrier channel of the routing attenuator network to enable each test unit to be an independent network level, enabling carrier communication of adjacent test units to be direct, and enabling carrier communication of non-adjacent test units to be relayed; when the routing attenuator network adopts a tree network, the carrier channels of the routing attenuator network are adjusted to enable a plurality of test units to be in a network level, adjacent network level carrier communication can reach directly, and non-adjacent network level carrier communication needs to be relayed.
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