CN113325227A - One-point grounding current acquisition method and device based on power line carrier communication - Google Patents
One-point grounding current acquisition method and device based on power line carrier communication Download PDFInfo
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- CN113325227A CN113325227A CN202110604172.XA CN202110604172A CN113325227A CN 113325227 A CN113325227 A CN 113325227A CN 202110604172 A CN202110604172 A CN 202110604172A CN 113325227 A CN113325227 A CN 113325227A
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Abstract
The application discloses a one-point grounding current acquisition method and a one-point grounding current acquisition device based on power line carrier communication, wherein the method comprises the following steps: acquiring a one-point grounding current analog signal of a PT neutral point secondary circuit through a preset current transformer; after converting the one-point grounding current analog signal into a first voltage analog signal, executing a preset analog-to-digital conversion operation to obtain a voltage digital signal; converting the voltage digital signal into a second voltage analog signal according to a preset protocol based on a power line carrier communication principle; preprocessing the second voltage analog signal according to the basic power signal to obtain a voltage signal to be coupled, wherein the preprocessing operation comprises signal filtering and signal superposition; and coupling the voltage signal to be coupled to the target power line through a magnetic coupling operation to be transmitted to the master station. The power cord and communication line need be laid simultaneously to prior art has been solved in this application, and the engineering volume increases along with the increase of device and distance, leads to the increasingly big technical problem of wire rod consumption.
Description
Technical Field
The application relates to the technical field of current collection, in particular to a one-point grounding current collection method and device based on power line carrier communication.
Background
The existing device for measuring one-point grounding current of the secondary system of the transformer substation in real time is mostly provided with a current meter which is connected in series in a grounding loop, the current meter is regularly checked in a manual inspection mode, and the numerical value of the grounding current is artificially recorded. Therefore, the manual inspection and data copying can consume more manpower and material resources. Meanwhile, inspection workers cannot perform data recording and observation before the current meter at all times, so that some abnormal conditions can be omitted, and the potential safety hazard is caused to the production safety of the transformer substation.
The existing one-point grounding current real-time monitoring device designed by combining a one-point grounding current meter and a wired communication mode often needs to be re-laid with a power line and a communication cable when equipment is installed, and the engineering quantity is gradually increased along with the increase of the one-point grounding current real-time monitoring device and the expansion of the distance, so that the consumption of construction wires is increased.
Disclosure of Invention
The application provides a one-point grounding current collection method and device based on power line carrier communication, and the method and device are used for solving the technical problems that in the prior art, a power line and a communication line need to be laid simultaneously, and the work load is increased along with the increase of the device and the distance, so that the wire consumption is larger and larger.
In view of this, the first aspect of the present application provides a method for collecting a one-point ground current based on power line carrier communication, including:
acquiring a one-point grounding current analog signal of a PT neutral point secondary circuit through a preset current transformer;
after the one-point grounding current analog signal is converted into a first voltage analog signal, executing a preset analog-to-digital conversion operation to obtain a voltage digital signal;
converting the voltage digital signal into a second voltage analog signal according to a preset protocol based on a power line carrier communication principle;
preprocessing the second voltage analog signal according to a basic power signal to obtain a voltage signal to be coupled, wherein the preprocessing operation comprises signal filtering and signal superposition;
and coupling the voltage signal to be coupled to a target power line through a magnetic coupling operation to be transmitted to the master station.
Preferably, after the one-point ground current analog signal is converted into a first voltage analog signal, a preset analog-to-digital conversion operation is performed to obtain a voltage digital signal, including:
converting the one-point grounding current analog signal into a first voltage analog signal through a preset signal conditioning circuit;
performing initial analog-to-digital conversion on the first voltage analog signal through an A/D converter to obtain an initial digital signal;
and calibrating the initial digital signal by a preset signal calibration algorithm to obtain a voltage digital signal.
Preferably, the preprocessing operation is performed on the second voltage analog signal according to the basic power signal to obtain a voltage signal to be coupled, and the preprocessing operation includes signal filtering and signal superposition, including:
performing signal filtering processing on the second voltage analog signal by adopting a preset filtering algorithm;
and performing signal superposition operation on the second voltage analog signal subjected to the signal filtering processing and the basic power signal to obtain a to-be-coupled voltage signal.
Preferably, the coupling the voltage signal to be coupled to the target power line to the master station through a magnetic coupling operation includes:
performing magnetic coupling operation on the voltage signal to be coupled through a preset transformer, and coupling the voltage signal to be coupled to a target power line to form a coupling voltage signal;
decoupling the coupling voltage signal on the target power line through a power line carrier communication convergence local side to obtain a target voltage signal;
and transmitting the target voltage signal to a master station by the power line carrier communication convergence local side by adopting a preset transmission technology.
Preferably, the transmitting the target voltage signal to the master station by the power line carrier communication convergence central office using a preset transmission technique further includes:
and converting the target voltage signal into a target acquisition one-point grounding current signal through a preset reverse signal conditioning circuit.
Preferably, the acquiring of the one-point ground current analog signal of the PT neutral point secondary circuit by the preset current transformer further includes:
and issuing a point grounding current acquisition instruction on the target power line through the master station.
This application second aspect provides a little ground current collection system based on power line carrier communication, includes:
the acquisition module is used for acquiring a one-point grounding current analog signal of the PT neutral point secondary circuit through a preset current transformer;
the first conversion module is used for performing preset analog-to-digital conversion operation after converting the one-point grounding current analog signal into a first voltage analog signal to obtain a voltage digital signal;
the second conversion module is used for converting the voltage digital signal into a second voltage analog signal according to a preset protocol based on a power line carrier communication principle;
the preprocessing module is used for preprocessing the second voltage analog signal according to a basic power signal to obtain a voltage signal to be coupled, and the preprocessing operation comprises signal filtering and signal superposition;
and the coupling transmission module is used for coupling the voltage signal to be coupled to a target power line through magnetic coupling operation and transmitting the voltage signal to be coupled to the master station.
Preferably, the first conversion module comprises:
the signal conditioning submodule is used for converting the one-point grounding current analog signal into a first voltage analog signal through a preset signal conditioning circuit;
the analog-to-digital conversion submodule is used for carrying out initial analog-to-digital conversion on the first voltage analog signal through an A/D converter to obtain an initial digital signal;
and the signal calibration submodule is used for carrying out calibration processing on the initial digital signal through a preset signal calibration algorithm to obtain a voltage digital signal.
Preferably, the preprocessing module comprises:
the filtering submodule is used for performing signal filtering processing on the second voltage analog signal by adopting a preset filtering algorithm;
and the superposition submodule is used for carrying out signal superposition operation on the second voltage analog signal subjected to the signal filtering processing and the basic electric power signal to obtain a to-be-coupled voltage signal.
Preferably, the coupling transmission module includes:
the coupling submodule is used for performing magnetic coupling operation on the voltage signal to be coupled through a preset transformer and coupling the voltage signal to be coupled to a target power line to form a coupling voltage signal;
the decoupling submodule is used for decoupling the coupling voltage signal on the target power line through a power line carrier communication convergence local side to obtain a target voltage signal;
and the transmission submodule is used for transmitting the target voltage signal to the main station by adopting a preset transmission technology through the power line carrier communication convergence local side.
According to the technical scheme, the embodiment of the application has the following advantages:
the application provides a one-point grounding current collection method based on power line carrier communication, which comprises the following steps: acquiring a one-point grounding current analog signal of a PT neutral point secondary circuit through a preset current transformer; after converting the one-point grounding current analog signal into a first voltage analog signal, executing a preset analog-to-digital conversion operation to obtain a voltage digital signal; converting the voltage digital signal into a second voltage analog signal according to a preset protocol based on a power line carrier communication principle; preprocessing the second voltage analog signal according to the basic power signal to obtain a voltage signal to be coupled, wherein the preprocessing operation comprises signal filtering and signal superposition; and coupling the voltage signal to be coupled to the target power line through a magnetic coupling operation to be transmitted to the master station.
According to the one-point grounding current acquisition method based on power line carrier communication, one-point grounding current acquired by a current transformer is converted, then a signal is processed into a couplable form based on a power line carrier communication principle, and finally the signal is coupled on a power line for transmission and is uploaded to a main station. The collected signals can be transmitted on the power line along with basic power signals, a communication line does not need to be laid after the power line is laid, and power supply and signal current signal collection operation can be completed while wires are saved. Therefore, the power cord and the communication line need be laid simultaneously to this application can be solved prior art, and the engineering volume increases along with the increase of device and distance, leads to the wire rod to consume technical problem bigger and bigger.
Drawings
Fig. 1 is a schematic flowchart of a method for collecting one-point ground current based on power line carrier communication according to an embodiment of the present disclosure;
fig. 2 is another schematic flow chart of a one-point ground current collection method based on power carrier communication according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a one-point ground current collection device based on power line carrier communication according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a one-point ground current monitoring system of the one-point ground current acquisition method based on power carrier communication according to the application example of the present application;
fig. 5 is a schematic structural diagram of a working principle of a current monitoring device in a one-point ground current monitoring system of the one-point ground current acquisition method based on power carrier communication according to the application example of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For convenience of understanding, referring to fig. 1, a first embodiment of a method for collecting one-point ground current based on power carrier communication provided by the present application includes:
One-point ground current of a neutral point secondary circuit of a voltage Transformer (PT) is also referred to as leakage current. The preset current transformer can be a straight-through current transformer which is made of high-permeability materials and is generally low in voltage and mostly has a single transformation ratio; the actual low-voltage transformer has low cost, and the cost of multiple transformation ratios is increased, so that a single transformation ratio is generally adopted.
The conversion of the one-point grounding current analog signal into the first voltage analog signal can be realized through a specific functional circuit, and currents with different sizes can be converted into voltage signals with equal proportions. The preset analog-to-digital conversion operation is to convert the first voltage analog signal into a digital signal, and the accuracy of the signal can be adjusted according to actual operation requirements.
And 103, converting the voltage digital signal into a second voltage analog signal according to a preset protocol based on the power line carrier communication principle.
Power Line Carrier Communication (Power Line Carrier Communication) is Power system Communication in which a Power transmission Line is a transmission medium of a Carrier signal. Some processing is required before signal transmission so that the signal is subject to transmission conditions. The preset protocol can be set according to specific requirements, such as a Modbus message transmission protocol; the voltage digital signal can be converted into a second voltage analog signal through a preset protocol, and the signal waveform is in a sine wave form.
And 104, preprocessing the second voltage analog signal according to the basic power signal to obtain a voltage signal to be coupled, wherein the preprocessing operation comprises signal filtering and signal superposition.
The basic power signal is a power signal supplied in the power line; the preprocessing operation can be seen as a preparation before the coupling operation, so that the signal load is coupled to the requirements. The signal filtering can carry out basic screening on the acquired signals, so that the accuracy of the signals is ensured; the signal superposition is to combine the communication signal and the power signal well, so that two signals can be transmitted in the power line at the same time.
And 105, coupling the voltage signal to be coupled to the target power line through magnetic coupling operation and transmitting the voltage signal to the master station.
Magnetic coupling is magnetic field coupling, which means that the current of one coil changes and induced electromotive force is generated in the adjacent coil; they are electrically independent of each other, and their interaction is linked by a magnetic field. Based on the principle, the voltage signal to be coupled is coupled to the target power line, so that the mutual influence between the power signal in the power line and the collected signal can be avoided, and the normality of power supply and communication is ensured. Generally, a transformer is used to realize magnetic coupling operation of signals.
According to the one-point grounding current acquisition method based on power line carrier communication, the one-point grounding current acquired by the current transformer is converted, then the signal is processed into a couplable form based on the power line carrier communication principle, and finally the signal is coupled on a power line for transmission and is uploaded to a main station. The collected signals can be transmitted on the power line along with basic power signals, a communication line does not need to be laid after the power line is laid, and power supply and signal current signal collection operation can be completed while wires are saved. Therefore, the technical problem that in the prior art, a power line and a communication line need to be laid simultaneously, and the amount of engineering is increased along with the increase of the device and the distance, so that the wire consumption is larger and larger can be solved.
The above is an embodiment of the method for collecting one-point ground current based on power carrier communication provided by the present application, and the following is another embodiment of the method for collecting one-point ground current based on power carrier communication provided by the present application.
For easy understanding, please refer to fig. 2, the present application provides a second embodiment of a method for collecting one-point ground current based on power carrier communication, including:
It can be understood that the acquisition instruction is issued through the target power line, so that the signal on the target power line can be divided into two parts, wherein one part is converted into the normal working voltage of the circuit board through an AC-DC power supply and is sent to each loop to meet the power supply requirement; the other part is to extract high-frequency communication signals through filtering low-frequency power signals, decouple the signals, convert the signals, send the signals to a current signal acquisition end and make corresponding response or operation. The acquisition instruction may include information such as acquisition frequency, time period of upload, etc.
The core-through current transformer is selected to collect a one-point grounding current analog signal, for example, the current collected at the time is 100mA, and the current signal is converted into a secondary side current signal of 100 uA.
The preset signal conditioning circuit can convert the 100uA secondary side current signal into a 1V first voltage analog signal, the currents with different sizes can be converted in equal proportion, interference signals can be eliminated in the process, and the quality of collected signals is improved.
And step 204, performing initial analog-to-digital conversion on the first voltage analog signal through an A/D converter to obtain an initial digital signal.
An analog-to-digital converter, or ADC for short, generally refers to an electronic component that converts an analog signal into a digital signal. A typical analog-to-digital converter converts an input voltage signal into an output digital signal. Since digital signals do not have practical significance per se, only one relative magnitude is represented. Therefore, any analog-to-digital converter needs a reference analog quantity as a conversion standard, and the common reference standard is the maximum convertible signal size; and the output digital quantity represents the magnitude of the input signal relative to the reference signal. Thus, the initial digital signal herein has no practical significance to physical quantities, but merely represents a relative magnitude.
The signal calibration is to convert the above-mentioned relative magnitude into an accurate voltage digital signal, so as to facilitate subsequent signal wave processing, such as digital signal transmission, filtering, etc. The preset signal calibration algorithm can set standards according to actual conditions, and is reasonable.
And step 206, converting the voltage digital signal into a second voltage analog signal according to a preset protocol based on the power line carrier communication principle.
The signal processing process based on the power line carrier communication principle is to edit the voltage digital signal into a message of a load preset protocol, such as a Modbus message transmission protocol; the obtained second voltage analog signal is in the form of a message data block.
And step 207, performing signal filtering processing on the second voltage analog signal by adopting a preset filtering algorithm.
The preset filtering algorithm may be selected according to actual hardware conditions or requirements, for example, median filtering, amplitude limiting filtering, mean filtering, and the like, and may be configured to filter an interference signal in the second voltage analog signal.
And 208, performing signal superposition operation on the second voltage analog signal subjected to the signal filtering processing and the basic power signal to obtain a to-be-coupled voltage signal.
In this embodiment, the filtered second voltage analog signal is superimposed on the basic power signal, but not substantial signal superimposition, and a waveform corresponding to the filtered second voltage analog signal is correspondingly processed according to waveform characteristics of the basic power signal, such as information of frequency, amplitude, and the like, so that the two signals can be conveniently and normally transmitted on the power line.
And 209, performing magnetic coupling operation on the voltage signal to be coupled through a preset transformer, and coupling the voltage signal to be coupled to a target power line to form a coupled voltage signal.
The magnetic coupling operation can avoid mutual influence between the basic power signal and the communication signal in the target power line, so that the two signals are normally transmitted in the power line. The magnetic coupling couples the communication signal on the target power line, resulting in a coupled voltage signal. The communication between the equipment or between the terminal and the terminal can be realized only by connecting the equipment or the terminal through a power line, and the task of collecting one-point grounding current is completed.
Coupling voltage signals and power signals transmitted on a target power line both reach a power line carrier communication convergence local side, the convergence local side decouples the coupling voltage signals, the target voltage signals can be obtained, decoupling and coupling are corresponding opposite operations, and the decoupling and coupling are realized strictly according to related protocols.
And step 211, transmitting the target voltage signal to the master station by the power line carrier communication convergence local side by adopting a preset transmission technology.
The preset transmission technology can be wired transmission, such as RS485 or RS232, and can also be in a 4G/5G wireless transmission mode according to needs. The main station can perform subsequent signal processing after receiving the acquired signals, such as monitoring and judging, and issue corresponding control instructions and the like.
And step 212, converting the target voltage signal into a target acquisition one-point grounding current signal through a preset reverse signal conditioning circuit.
The preset reverse signal conditioning circuit is a circuit with the function opposite to that of the preset signal conditioning circuit, and converts a voltage signal into a current signal to obtain a point grounding current signal acquired by the acquisition end.
According to the one-point grounding current acquisition method based on power line carrier communication, the one-point grounding current acquired by the current transformer is converted, then the signal is processed into a couplable form based on the power line carrier communication principle, and finally the signal is coupled on a power line for transmission and is uploaded to a main station. The collected signals can be transmitted on the power line along with basic power signals, a communication line does not need to be laid after the power line is laid, and power supply and signal current signal collection operation can be completed while wires are saved. Therefore, the technical problem that in the prior art, a power line and a communication line need to be laid simultaneously, and the amount of engineering is increased along with the increase of the device and the distance, so that the wire consumption is larger and larger can be solved.
For convenience of understanding, the present application provides an embodiment of a monitoring system corresponding to a one-point ground current collection method based on power line carrier communication, please refer to fig. 4, which specifically includes a current monitoring device, a power line carrier communication convergence office, an intelligent gateway, and a master station, where the current monitoring device further includes a feedthrough transformer, a signal conditioning circuit, an a/D converter, a monitoring device CPU, a power line carrier communication conversion module, and a power line, please refer to fig. 5.
Referring to fig. 4, the power line carrier communication convergence office and the sensing device in the current monitoring apparatus are connected to the power line from the same transformer for power supply and communication, the convergence office needs to be connected to a three-phase power supply, and the sensing device only needs to be connected to one of the phase power supplies. Before the three-phase power supply is connected, the MAC address of the current monitoring device needs to be configured for the convergence local side equipment, then the three-phase power supply is connected, and after the current monitoring device is connected with the power supply, the equipment on the power line transmission network can be automatically networked.
After the networking is successful, the current collection operation can be started, please refer to fig. 5, which includes the following specific processes: the current monitoring device collects a point grounding current signal through the core-through mutual inductor, then performs signal conversion through the signal conditioning circuit and the A/D converter, and realizes signal calibration operation through the CPU to obtain an accurate ground voltage digital signal. Then, carrying out protocol conversion, filtering and signal superposition operations on the power line carrier communication conversion module, and finally coupling the obtained signal to a power line for transmission, wherein the power line transmits the signal to a convergence local side, and the convergence local side decouples the signal from the power line and uploads the signal to an intelligent gateway through RS485 or RS232, and the intelligent gateway can also be an information acquisition terminal; the intelligent gateway transmits signals to the main station through the 4G/5G wireless network, the main station performs signal conversion to obtain a point grounding current signal, then performs monitoring operation processing on the current signal, and generates a corresponding control instruction according to a processing result, for example, a worker is reminded to check the point grounding condition of the PT neutral point secondary circuit. The protocol related to protocol conversion is a Modbus message transmission protocol, a broadband carrier networking is adopted in a communication mode based on power line carrier communication, the working frequency of a broadband carrier is 2-12 MHz, frequency expansion is supported, the communication transmission rate of an application layer is up to 3Mbit/s, an OFDM technology is adopted in a modulation mode, BPSK, QPSK, 8QAM, 16QAM and 64QAM are supported by subcarriers, and strong denoising and error correction capabilities are achieved through FEC and CRC technologies.
The above is an embodiment of the method for collecting one-point ground current based on power carrier communication provided by the present application, and the following is another embodiment of the method for collecting one-point ground current based on power carrier communication provided by the present application.
For easy understanding, please refer to fig. 3, the present application further provides an embodiment of a single-point ground current collecting apparatus based on power carrier communication, including:
the acquisition module 301 is configured to acquire a one-point ground current analog signal of the PT neutral point secondary circuit through a preset current transformer;
the first conversion module 302 is configured to perform a preset analog-to-digital conversion operation after converting the one-point ground current analog signal into a first voltage analog signal, so as to obtain a voltage digital signal;
the second conversion module 303 is configured to convert the voltage digital signal into a second voltage analog signal according to a preset protocol based on a power line carrier communication principle;
the preprocessing module 304 is configured to perform preprocessing operation on the second voltage analog signal according to the basic power signal to obtain a to-be-coupled voltage signal, where the preprocessing operation includes signal filtering and signal superposition;
and a coupling transmission module 305, configured to couple the voltage signal to be coupled to the target power line through a magnetic coupling operation to transmit to the master station.
Further, the first conversion module 302 includes:
the signal conditioning submodule 3021 is configured to convert the one-point ground current analog signal into a first voltage analog signal through the preset signal conditioning circuit;
the analog-to-digital conversion submodule 3022 is configured to perform initial analog-to-digital conversion on the first voltage analog signal by using an a/D converter to obtain an initial digital signal;
the signal calibration submodule 3023 is configured to perform calibration processing on the initial digital signal through a preset signal calibration algorithm to obtain a voltage digital signal.
Further, the preprocessing module 304 includes:
the filtering submodule 3041 is configured to perform signal filtering processing on the second voltage analog signal by using a preset filtering algorithm;
the superposition submodule 3042 is configured to perform signal superposition on the second voltage analog signal after the signal filtering processing and the basic power signal, so as to obtain a to-be-coupled voltage signal.
Further, the coupling transmission module 305 includes:
the coupling submodule 3051 is configured to perform a magnetic coupling operation on a to-be-coupled voltage signal through a preset transformer, and couple the to-be-coupled voltage signal to a target power line to form a coupled voltage signal;
the decoupling submodule 3052 is configured to decouple the coupling voltage signal on the target power line through the power line carrier communication convergence local side, so as to obtain a target voltage signal;
the transmission sub-module 3053 is configured to transmit the target voltage signal to the master station by using a preset transmission technology through the power line carrier communication convergence office.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for executing all or part of the steps of the method described in the embodiments of the present application through a computer device (which may be a personal computer, a server, or a network device). And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A one-point grounding current collection method based on power line carrier communication is characterized by comprising the following steps:
acquiring a one-point grounding current analog signal of a PT neutral point secondary circuit through a preset current transformer;
after the one-point grounding current analog signal is converted into a first voltage analog signal, executing a preset analog-to-digital conversion operation to obtain a voltage digital signal;
converting the voltage digital signal into a second voltage analog signal according to a preset protocol based on a power line carrier communication principle;
preprocessing the second voltage analog signal according to a basic power signal to obtain a voltage signal to be coupled, wherein the preprocessing operation comprises signal filtering and signal superposition;
and coupling the voltage signal to be coupled to a target power line through a magnetic coupling operation to be transmitted to the master station.
2. The method for collecting one-point ground current based on power carrier communication according to claim 1, wherein the converting the one-point ground current analog signal into a first voltage analog signal and then performing a preset analog-to-digital conversion operation to obtain a voltage digital signal comprises:
converting the one-point grounding current analog signal into a first voltage analog signal through a preset signal conditioning circuit;
performing initial analog-to-digital conversion on the first voltage analog signal through an A/D converter to obtain an initial digital signal;
and calibrating the initial digital signal by a preset signal calibration algorithm to obtain a voltage digital signal.
3. The method for collecting one-point ground current based on power carrier communication according to claim 1, wherein the preprocessing operation on the second voltage analog signal according to the basic power signal to obtain the voltage signal to be coupled, the preprocessing operation including signal filtering and signal superposition includes:
performing signal filtering processing on the second voltage analog signal by adopting a preset filtering algorithm;
and performing signal superposition operation on the second voltage analog signal subjected to the signal filtering processing and the basic power signal to obtain a to-be-coupled voltage signal.
4. The method for acquiring one-point ground current based on power carrier communication according to claim 1, wherein the coupling the voltage signal to be coupled to a target power line through a magnetic coupling operation for transmission to a master station comprises:
performing magnetic coupling operation on the voltage signal to be coupled through a preset transformer, and coupling the voltage signal to be coupled to a target power line to form a coupling voltage signal;
decoupling the coupling voltage signal on the target power line through a power line carrier communication convergence local side to obtain a target voltage signal;
and transmitting the target voltage signal to a master station by the power line carrier communication convergence local side by adopting a preset transmission technology.
5. The method for collecting one-point ground current based on power line carrier communication according to claim 4, wherein the target voltage signal is transmitted to a master station by the power line carrier communication convergence office using a preset transmission technique, and then further comprising:
and converting the target voltage signal into a target acquisition one-point grounding current signal through a preset reverse signal conditioning circuit.
6. The method for acquiring one-point ground current based on power carrier communication according to claim 1, wherein the acquiring one-point ground current analog signals of the PT neutral point secondary circuit by a preset current transformer further comprises:
and issuing a point grounding current acquisition instruction on the target power line through the master station.
7. One point ground connection current collection system based on power line carrier communication, its characterized in that includes:
the acquisition module is used for acquiring a one-point grounding current analog signal of the PT neutral point secondary circuit through a preset current transformer;
the first conversion module is used for performing preset analog-to-digital conversion operation after converting the one-point grounding current analog signal into a first voltage analog signal to obtain a voltage digital signal;
the second conversion module is used for converting the voltage digital signal into a second voltage analog signal according to a preset protocol based on a power line carrier communication principle;
the preprocessing module is used for preprocessing the second voltage analog signal according to a basic power signal to obtain a voltage signal to be coupled, and the preprocessing operation comprises signal filtering and signal superposition;
and the coupling transmission module is used for coupling the voltage signal to be coupled to a target power line through magnetic coupling operation and transmitting the voltage signal to be coupled to the master station.
8. The single-point ground current collection device based on power carrier communication according to claim 7, wherein the first conversion module comprises:
the signal conditioning submodule is used for converting the one-point grounding current analog signal into a first voltage analog signal through a preset signal conditioning circuit;
the analog-to-digital conversion submodule is used for carrying out initial analog-to-digital conversion on the first voltage analog signal through an A/D converter to obtain an initial digital signal;
and the signal calibration submodule is used for carrying out calibration processing on the initial digital signal through a preset signal calibration algorithm to obtain a voltage digital signal.
9. The device for collecting one-point grounding current based on power carrier communication according to claim 7, wherein the preprocessing module comprises:
the filtering submodule is used for performing signal filtering processing on the second voltage analog signal by adopting a preset filtering algorithm;
and the superposition submodule is used for carrying out signal superposition operation on the second voltage analog signal subjected to the signal filtering processing and the basic electric power signal to obtain a to-be-coupled voltage signal.
10. The device for collecting one-point grounding current based on power carrier communication according to claim 7, wherein the coupling transmission module comprises:
the coupling submodule is used for performing magnetic coupling operation on the voltage signal to be coupled through a preset transformer and coupling the voltage signal to be coupled to a target power line to form a coupling voltage signal;
the decoupling submodule is used for decoupling the coupling voltage signal on the target power line through a power line carrier communication convergence local side to obtain a target voltage signal;
and the transmission submodule is used for transmitting the target voltage signal to the main station by adopting a preset transmission technology through the power line carrier communication convergence local side.
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