CN116054402B - Current demodulation method, modulation method, device and medium for topology identification - Google Patents
Current demodulation method, modulation method, device and medium for topology identification Download PDFInfo
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- CN116054402B CN116054402B CN202310029193.2A CN202310029193A CN116054402B CN 116054402 B CN116054402 B CN 116054402B CN 202310029193 A CN202310029193 A CN 202310029193A CN 116054402 B CN116054402 B CN 116054402B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/02—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage
- G01R23/04—Arrangements for measuring frequency, e.g. pulse repetition rate; Arrangements for measuring period of current or voltage adapted for measuring in circuits having distributed constants
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/30—Measuring the maximum or the minimum value of current or voltage reached in a time interval
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The application provides a current demodulation method, a modulation method, equipment and a medium for topology identification, which are applied to the technical field of topology identification, wherein the demodulation method for topology identification comprises the following steps: acquiring a modulated current signal comprising topology information of the device; filtering the modulated current signal through a first band-pass filter to obtain a first filtered signal; obtaining average instantaneous frequency of each point in the first filtering signal; obtaining an average instantaneous frequency change curve of the first filtering signal according to the average instantaneous frequency of each point position in the first filtering signal; and determining topology information of the equipment according to the frequency peak value and the frequency valley value in the average instantaneous frequency change curve. Because the frequency peak value and the frequency valley value in the modulation current signal can be correspondingly set according to the topology information of the equipment, more information can be carried in the modulation current signal, so that the time required for transmitting can be reduced, and the power consumption of a circuit for injecting the modulation current can be reduced.
Description
Technical Field
The present application relates to the field of topology identification technologies, and in particular, to a current demodulation method, a modulation method, a device, and a medium for topology identification.
Background
In the field of power distribution, information management needs to be performed on power distribution equipment, and installation information of the equipment is often not clear, such as from which area a meter box comes, which presents a great obstacle to power distribution information management, so that the position of the equipment in a power distribution network needs to be determined through topology identification.
Topology identification technology is a technology that locates the location of a device in a cell topology network. Topology identification techniques typically involve having a power distribution device inject a segment of a characteristic current on the power line that includes topology information, and sampling the current at the transformer exit location, and determining the location of the power distribution device in the topology network by identifying the topology information in the characteristic current. The characteristic current is usually generated by a single-frequency OOK (On-Off Keying) modulation method, the idea is to use binary coding, and a high-frequency signal with specific time is injected On a current bus to serve as a data bit 1. However, when there is a lot of topology information to be transmitted, there is more binary data encoded on the topology information, and the time required for transmission increases, resulting in excessive power consumption of a circuit for injecting a modulation current.
Disclosure of Invention
The application provides a current demodulation method, a modulation method, a device and a medium for topology identification, which are used for reducing time required for transmitting topology information and reducing power consumption of a circuit for injecting modulation current.
In a first aspect, the present application provides a current demodulation method for topology identification, the method comprising: acquiring a modulated current signal, wherein the modulated current signal comprises topology information of equipment; filtering the modulated current signal through a first band-pass filter to obtain a first filtered signal, wherein the central frequency of the first band-pass filter is a first frequency or a second frequency, the first frequency is a difference value between a preset central frequency and a preset power frequency, the second frequency is a sum value of the preset central frequency and the preset power frequency, and the preset central frequency is used for modulating the modulated current signal; obtaining average instantaneous frequency of each point in the first filtering signal; obtaining an average instantaneous frequency change curve of the first filtering signal according to the average instantaneous frequency of each point position in the first filtering signal; and determining topology information of the equipment according to the frequency peak value and the frequency valley value in the average instantaneous frequency change curve.
According to the embodiment of the application, the frequency peak value and the frequency valley value in the modulation current signal can be correspondingly set according to the topology information of the equipment, so that more information can be carried in the modulation current signal, the time required for transmitting can be reduced, and the power consumption of a circuit for injecting the modulation current can be further reduced.
In one possible implementation manner of the present application, the obtaining the average instantaneous frequency of each point in the first filtered signal includes: determining a plurality of maximum value points ordered by occurrence time and a plurality of minimum value points ordered by occurrence time in the first filtering signal; determining a first time span between each preset number of the plurality of maximum points in the plurality of maximum points; determining a second time span between each preset number of the plurality of minimum points; and determining the average instantaneous frequency of each point in the first filtering signal according to the preset quantity, the first time span and the second time span.
According to the embodiment of the application, the average instantaneous frequency of each point in the first filter signal is determined through the maximum value points in the first filter signal which are ordered according to the occurrence time and the minimum value points in the first filter signal which are ordered according to the occurrence time, so that the calculation of the average instantaneous frequency is realized.
In one possible implementation of the application, the average instantaneous frequency, the preset number, the first time span and the second time span satisfy the following formula:
F＝2M/(t1+t2)
wherein F is the average instantaneous frequency, M is the preset number, t1 is the first time span, and t2 is the second time span.
According to the embodiment of the application, the average instantaneous frequency is determined through the first time span, the second time span and the preset number, so that the accurate calculation of the average instantaneous frequency is realized.
In one possible implementation manner of the present application, the determining topology information of the device according to the frequency peak value and the frequency valley value in the average instantaneous frequency variation curve includes: determining the number of frequency peaks and the number of frequency troughs in the average instantaneous frequency change curve according to the frequency peaks and the frequency troughs in the average instantaneous frequency change curve; determining the sum of the number of frequency peaks and the number of frequency troughs as a first number of frequency components in the modulated current signal; and determining topology information of the equipment according to the first quantity and a preset coding mode.
According to the embodiment of the application, the first quantity of the frequency components in the modulated current signal is corresponding to the topology information through the preset coding mode, so that the purpose of extracting the topology information in the modulated current signal is realized.
In one possible implementation manner of the present application, after the obtaining the modulated current signal, the method further includes: filtering the modulated current signal through a second band-pass filter to obtain a second filtered signal, wherein the center frequency of the second band-pass filter is the first frequency or the second frequency, and the center frequency of the second band-pass filter is different from the center frequency of the first band-pass filter; obtaining average instantaneous frequency of each point bit in the second filtering signal; obtaining an average instantaneous change curve of the second filtering signal according to the average instantaneous frequency of each point position in the second filtering signal; determining a second number of frequency components in the modulated current signal based on frequency peaks and frequency valleys in an average instantaneous frequency variation curve of the second filtered signal; the determining topology information of the device according to the first number and the preset coding mode includes: and if the second number is the same as the first number, determining topology information of the equipment according to the first number or the second number and the preset coding mode.
According to the embodiment of the application, the modulated current signal is subjected to filtering processing through the second band-pass filter to obtain the second quantity, and the topology information of the equipment is determined based on mutual verification between the second quantity and the first quantity, so that the determined topology information is more reliable.
In a second aspect, the present application provides a current modulation method for topology identification, the method comprising: obtaining topology information of equipment; coding the topology information by adopting a preset coding mode to obtain a frequency peak value and a frequency valley value in a current signal to be modulated; and carrying out current modulation processing according to the frequency peak value and the frequency valley value to obtain a modulated current signal.
According to the embodiment of the application, the frequency peak value and the frequency valley value in the modulation current signal can be correspondingly set according to the topology information of the equipment, so that more information can be carried in the modulation current signal, the time required for transmitting can be reduced, and the power consumption of a circuit for injecting the modulation current can be further reduced.
In one possible implementation manner of the present application, the preset coding manner includes a 10-ary coding manner.
In one possible implementation manner of the present application, the modulated current signal includes a plurality of signal segments sequentially connected one after the other, the frequencies in the same signal segment are the same, the frequencies of two adjacent signal segments are different, and the frequencies of the first signal segment and the last signal segment in the modulated current signal are the same.
According to the embodiment of the application, the frequencies in the same signal segment are set to be the same, and the frequencies of two adjacent signal segments are set to be different, so that the frequency peak value and the frequency valley value can be conveniently determined during current demodulation.
In one possible implementation manner of the present application, the method further includes: transmitting the modulated current signal; the duration of the transmission of the first signal segment and the last signal segment in the modulated current signal is T1 periods, the duration of the transmission of the signal segments except the first signal segment and the last signal segment is T2 periods, and T2 is not equal to T1.
The embodiment of the application sets the duration time of the signal segment transmission to be different so as to facilitate the determination of the frequency peak value and the frequency valley value during current demodulation.
In one possible implementation of the present application, the frequency of one of any two adjacent signal segments of the modulated current signal, excluding the first signal segment and the last signal segment of the modulated current signal, is greater than a preset center frequency, and the frequency of the other signal segment is less than the preset center frequency.
According to the embodiment of the application, through the frequency setting of the signal fragments, the frequency peaks and the frequency valleys are formed in the modulated current signal, so that the frequency peaks and the frequency valleys can be conveniently determined during current demodulation.
In a third aspect, the present application also provides an electronic device, including: one or more processors; a memory; and one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor to implement the current demodulation method for topology identification described above or to implement the current modulation method for topology identification described above.
In a fourth aspect, the present application also provides a computer readable storage medium, on which a computer program is stored, the computer program being loaded by a processor to perform the steps in the above-described current demodulation method for topology identification, or to perform the steps in the above-described current modulation method for topology identification.
In a fifth aspect, the application provides a computer program product comprising computer programs or instructions which, when executed by an electronic device, cause the electronic device to perform the method of the first aspect or any of the possible implementations of the first aspect or the method of the second aspect or any of the possible implementations of the second aspect.
The current demodulation method, the modulation method, the device and the medium for topology identification, which are provided by the embodiment of the application, are applied to the technical field of topology identification, and the demodulation method for topology identification comprises the following steps: acquiring a modulation current signal, wherein the modulation current signal comprises topology information of equipment; filtering the modulated current signal through a first band-pass filter to obtain a first filtered signal; obtaining average instantaneous frequency of each point in the first filtering signal; obtaining an average instantaneous frequency change curve of the first filtering signal according to the average instantaneous frequency of each point position in the first filtering signal; and determining topology information of the equipment according to the frequency peak value and the frequency valley value in the average instantaneous frequency change curve. According to the application, the frequency peak value and the frequency valley value in the modulation current signal can be correspondingly set according to the topology information of the equipment, so that more information can be carried in the modulation current signal, the time required for transmitting can be reduced, and the power consumption of a circuit for injecting the modulation current can be reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of one possible current demodulation/modulation system for topology identification provided by an embodiment of the present application;
FIG. 2 is a schematic diagram of a single frequency OOK modulation method;
FIG. 3 is a flow diagram of one embodiment of a current modulation method for topology identification provided in an embodiment of the present application;
FIG. 4 is a schematic diagram of a plurality of frequency components in a modulated current provided in an embodiment of the present application;
FIG. 5 is a schematic diagram of a plurality of numerical information provided in an embodiment of the present application;
FIG. 6 is a schematic diagram of a circuit for injecting a modulation current provided in an embodiment of the present application;
FIG. 7 is a flow diagram of one embodiment of a current demodulation method for topology identification provided in an embodiment of the present application;
FIG. 8 is a schematic diagram of a modulated current signal provided in an embodiment of the application;
FIG. 9 is a schematic diagram of a first filtered signal provided in an embodiment of the present application;
FIG. 10 is a schematic diagram of a plurality of maxima in a first filtered signal sorted by time of occurrence provided in an embodiment of the present application;
FIG. 11 is a schematic diagram of the occurrence times of a plurality of maxima in a first filtered signal provided in an embodiment of the present application;
FIG. 12 is a schematic diagram of an average of a first time span and a second time span of points in a first filtered signal according to an embodiment of the present application;
FIG. 13 is a schematic diagram of an average instantaneous frequency variation curve of a first filtered signal provided in an embodiment of the present application;
FIG. 14 is a schematic diagram of an average instantaneous frequency variation curve of a second filtered signal provided in an embodiment of the present application;
FIG. 15 is a schematic diagram of an embodiment of a current demodulation device for topology identification according to an embodiment of the present application
FIG. 16 is a schematic diagram of an embodiment of a current modulation apparatus for topology identification provided in an embodiment of the application
Fig. 17 is a schematic structural diagram of an embodiment of an electronic device provided in an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "plurality" means two or more, unless otherwise specifically defined, "/" means "or".
In the present application, the words "in embodiments of the application" and "in some embodiments of the application" are used to mean "serving as an example, instance, or illustration. Any embodiment of the application described as "in an embodiment of the application" or "in some embodiments of the application" is not necessarily to be construed as preferred or advantageous over other embodiments. The following description is presented to enable any person skilled in the art to make and use the application. In the following description, details are set forth for purposes of explanation. It will be apparent to one of ordinary skill in the art that the present application may be practiced without these specific details. In other instances, well-known principles and processes have not been described in detail to avoid unnecessarily obscuring the description of the present application. Thus, the present application is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed herein.
The embodiment of the application provides a current demodulation method, a modulation method, equipment and a medium for topology identification, which are respectively described in detail below.
Firstly, the application scenarios of the current demodulation method and the modulation method for topology identification are illustrated, and the specific steps are as follows: in a distribution equipment topology network of a zone, at least two levels of distribution equipment are included. Taking the example of a two-level power distribution device comprising an upper level power distribution device and a lower level power distribution device, it is necessary to determine to which upper level power distribution device the lower level power distribution device is connected in particular, i.e. to determine the location of the lower level power distribution device in the power distribution device topology network.
In view of the above scenario, an embodiment of the present application provides a possible current demodulation/modulation system for topology identification, as shown in fig. 1. The current demodulation/modulation system for topology recognition includes a current modulation device 100 and a current demodulation device 200. The current modulation device 100 is used for modulating a current signal. For example, the current modulation device 100 may be a current modulator. The current demodulation device 200 is used for demodulation of the modulated current signal. For example, the current demodulation device 200 may be a current demodulator. It is to be understood that the current demodulation apparatus 200 and the current modulation apparatus 100 may be integrated in the same physical device, or may be integrated in different physical devices, which is not limited herein. Fig. 1 illustrates that current demodulation apparatus 200 and current modulation apparatus 100 may be integrated into the same physical device.
It should be noted that, the current demodulation/modulation system for topology identification shown in fig. 1 is only an example, and the current demodulation/modulation system for topology identification described in the embodiment of the present application is for more clearly describing the technical solution of the embodiment of the present application, and does not constitute a limitation of the technical solution provided by the embodiment of the present application, and it is known by those skilled in the art that, as the current demodulation/modulation system for topology identification evolves and new service scenarios occur, the technical solution provided by the embodiment of the present application is applicable to similar technical problems.
Based on the above, the topology identification technology is generally implemented based on a single frequency OOK modulation method. Referring to fig. 2, fig. 2 is a schematic diagram of a single frequency OOK modulation method. The single-frequency OOK modulation method adopts a binary coding mode to generate a digital signal (the data signal comprises a data bit 1 and a data bit 0), and controls the on and off of sinusoidal carrier current according to the digital signal to obtain a modulated current signal, wherein the frequency of high-frequency current in which the data bit 1 is positioned in the modulated current signal avoids the frequency multiplication of preset power frequency, and the preset power frequency is generally 50 Hz. The injection of the sinusoidal carrier current may be a constant current or constant voltage injection, with each high frequency current being sent for a specific time, typically a few hundred milliseconds.
It can be seen that if the single-frequency OOK modulation method is adopted, if the topology information to be transmitted is more, the injection time of the modulation current will be increased, and the power consumption of the circuit for injecting the modulation current is too large, which brings challenges to heat dissipation of hardware. In addition, single frequency is easy to be interfered, and demodulation in an interference environment is not facilitated.
Based on the above, the present application proposes a current modulation method for topology identification. According to the method, the frequency peak value and the frequency valley value in the modulation current signal can be correspondingly set according to the topology information of the equipment, so that more information can be carried in the modulation current signal, the time required for transmitting can be reduced, and the power consumption of a circuit for injecting the modulation current can be reduced.
Referring to fig. 3 to 6, fig. 3 is a flowchart illustrating an embodiment of a current modulation method for topology identification according to an embodiment of the present application. The current modulation method for topology identification is applied to the lower-level power distribution equipment in the scene, and is implemented by the current modulation device 100 at the lower-level power distribution equipment. The current modulation method for topology identification corresponds to a current demodulation method for topology identification, and specifically comprises the following steps:
301. Topology information of the device is obtained.
The topology information in the embodiment of the application may be any identification information of the device, for example, the topology information may be a serial number of the power distribution device, where the serial number may be represented by N bits, where N is an integer greater than 1, for example, may be represented by 4 bits, such as 9752, and further such as ABCD, etc.; or may be represented by 8 bits, such as 9752ABCD, further such as 9A7B5C2D, etc., as the application is not limited in this regard. It is understood that the topology information may be other identification information besides the serial number, and different devices may be distinguished by the topology information.
302. And (3) encoding the topology information by adopting a preset encoding mode to obtain a frequency peak value and a frequency valley value in the current signal to be modulated.
The preset encoding mode in the embodiment of the present application may be a 10-ary encoding mode, and of course, may be other possible encoding modes, which is not limited. Taking topology information as 9 as an example, after encoding according to a 10-system encoding mode, the numerical information obtained by encoding is also 9, and then the target number of frequency components in the current signal to be modulated is 10. Taking the topology information as 7 as an example, after encoding according to the 10-system encoding mode, the numerical information obtained by encoding is also 7, and then the target number of frequency components in the current signal to be modulated is 8.
In the embodiment of the application, the frequency value of each frequency component of the target quantity is determined based on the target quantity of the frequency components in the current signal to be modulated, so that the frequency peak value and the frequency valley value in the current signal to be modulated are obtained. Taking the target number as 10 as an example, the frequency values of the plurality of frequency components may be sequentially: 827Hz, 812Hz, 830Hz, 815Hz, 833Hz, 818Hz, 836Hz, 821Hz, 839Hz, 824Hz, 827Hz, it can be seen that frequency peaks and frequency valleys are present in the plurality of frequency components. Taking the target number of 8 as an example, the frequency values of the plurality of frequency components may be sequentially: 827Hz, 812Hz, 830Hz, 815Hz, 833Hz, 818Hz, 836Hz, 821Hz, 827Hz. Taking the target number of 0 as an example, the frequency values of the plurality of frequency components may be sequentially: 827Hz, 827Hz. Wherein 827Hz is a preset center frequency, i.e., the center frequency of the current signal to be modulated.
In some embodiments of the present application, when determining the frequency value of each frequency component of the target number based on the target number of frequency components in the current signal to be modulated, the value may be determined as follows: the modulated current signal comprises a plurality of signal segments which are sequentially connected from front to back, the frequencies in the same signal segment are the same (namely, the same signal segment only has one frequency component), the frequencies of two adjacent signal segments are different, and the frequencies of the first signal segment and the last signal segment in the modulated current signal are the same (for example, the frequencies are all the preset center frequency 827 Hz).
In some embodiments of the present application, to facilitate demodulation of the modulated current signal, it is desirable to limit the duration of transmission of each signal segment in the modulated current signal when transmitting the modulated current signal. For example, the duration of each signal segment transmission may be 60-100 cycles. For another example, in the modulated current signal, the duration of the first signal segment and the last signal segment is T1 cycles, the duration of the signal segment other than the first signal segment and the last signal segment is T2 cycles, T2 is not equal to T1, and for example, fig. 4 includes four signal segments (square wave signals) of 827Hz, 812Hz, 839Hz, and T1 takes a value of 100, and T2 takes a value of 60.
Further optionally, in order to facilitate demodulation of the modulated current signal, when the modulated current signal includes at least three signal segments, the difference between the frequencies of adjacent signal segments differs by at least 3Hz, and is staggered as much as possible, for example, the frequency of one of any two adjacent signal segments in the modulated current signal except for the first signal segment and the last signal segment in the modulated current signal is greater than a preset center frequency, and the frequency of the other signal segment is less than the preset center frequency, so that the frequency difference between the adjacent signal segments is greater.
303. And carrying out current modulation processing according to the frequency peak value and the frequency valley value to obtain a modulated current signal.
In the embodiment of the application, the circuit for injecting the modulation current shown in fig. 6 is adopted to realize the current modulation processing, the circuit for injecting the modulation current shown in fig. 6 is connected with a power line, the point G in fig. 6 is a switch, and the switch is used for controlling the switching frequency of a constant current source in the circuit, so that a current signal with a specified frequency is modulated.
The current modulation processing according to the current modulation processing of the frequency peak value and the frequency valley value may include: and inputting a control signal containing the determined frequency components (comprising a frequency peak value and a frequency valley value which are connected in sequence) to the G point so that the circuit generates a current signal with a corresponding frequency. When sequentially transmitting a plurality of numerical information (e.g., 9, 7, 5, 2), the control signal of the plurality of frequency components determined according to the numerical information "9" is input to the G point, then the control signal is grounded for 100 ms (i.e., no modulated null information), then the control signal of the plurality of frequency components determined according to the numerical information "9" is input to the G point, then the control signal is grounded for 100 ms, and so on, the numerical information "5" and "2", and the control signal is changed as shown in fig. 5.
According to the current modulation method for topology identification, the frequency peak value and the frequency valley value in the modulated current signal can be correspondingly set according to the numerical information for topology identification, so that more information can be carried in the modulated current signal, the time required for transmission can be reduced, and the power consumption of a circuit for injecting modulated current can be further reduced.
Based on the above, the application also provides a current demodulation method for topology identification. According to the method, the frequency peak value and the frequency valley value in the modulation current signal can be correspondingly set according to the topology information of the equipment, so that more information can be carried in the modulation current signal, the time required for transmitting can be reduced, and the power consumption of a circuit for injecting the modulation current can be reduced.
Referring to fig. 7 to 14, fig. 7 is a flowchart illustrating an embodiment of a current demodulation method for topology identification according to an embodiment of the present application. The current demodulation method for topology identification is applied to the upper-level power distribution equipment in the scene and is implemented by the current demodulation device 200 at the upper-level power distribution equipment. The current demodulation method for topology identification corresponds to a current modulation method for topology identification, and comprises the following steps:
701. A modulated current signal is acquired, the modulated current signal comprising topology information of the device.
The modulated current signal in the embodiment of the present application may be obtained by using the current modulation method shown in fig. 3. Taking fig. 8 as an example, the modulated current signal includes characteristic currents of 6 frequency components, the frequencies of the 6 frequency components are 827Hz, 812Hz, 830Hz, 815Hz, 833Hz, 818Hz, respectively, and the modulated current signal represents the numerical information of "5". It will be appreciated that the simplified diagram of the modulated current signal is shown in fig. 8 and is not intended to be limiting of the modulated current signal, as the frequencies 827Hz, 812Hz, 830Hz, 815Hz, 833Hz, 818Hz, etc. cannot be directly observed by the naked eye.
702. And filtering the modulated current signal through a first band-pass filter to obtain a first filtered signal.
The center frequency of the first band-pass filter is a first frequency or a second frequency, the first frequency is a difference value between a preset center frequency and a preset power frequency, the second frequency is a sum value of the preset center frequency and the preset power frequency, and the preset center frequency is used for modulating the modulating current signal.
In the embodiment of the application, the modulated current signal acquired in real time is subjected to real-time filtering processing through the first band-pass filter, so that the frequency components of a specific frequency band in the modulated current signal pass through, and other frequency components are greatly attenuated, thereby extracting the effective frequency components in the modulated current signal. The center frequency adopted when modulating the current signal is a preset center frequency f1, and according to the current modulation characteristics, it can be known that the modulated current signal obtained by actual sampling is the product of the modulated signal and the voltage signal (wherein, the modulated signal refers to a low-frequency signal converted from original information, for example, the modulated signal refers to a low-frequency signal generated by the above numerical information, and the low-frequency signal needs to be loaded to the voltage signal, so as to obtain a high-frequency modulated current signal, namely, a current modulation principle, wherein, the voltage signal is generally a sine carrier signal), and according to a trigonometric function integration sum difference formula:
It can be known that the center frequency of the modulated current signal obtained by actual sampling is the difference between the preset center frequency and the preset power frequency (i.e. f1-50 Hz) or the sum of the preset center frequency and the preset power frequency (i.e. f1+50 Hz). The center frequency of the first band-pass filter is thus designed to be f1-50Hz or f1+50Hz. It is also understood that a first band-pass filter is constructed with a center frequency of f1-50Hz or f1+50Hz.
In some embodiments of the application, the first bandpass filter is a narrowband bandpass filter, typically designed to have a bandwidth of 40Hz. The first band-pass filter may be, for example, a recursive filter (Infinite Impulse Response, IIR) or a non-recursive filter (Finite Impulse Response, FIR), as the application is not limited in this respect.
Referring to fig. 9, fig. 9 is an example of a first filtered signal obtained after the filtering process. If the preset center frequency f1 of the modulated current signal takes a value of 827Hz, the center frequency of the first band pass filter may be 827Hz-50 hz=777hz, the bandwidth is typically 30Hz, and the passband is typically [760Hz,790hz ].
703. The average instantaneous frequency of each point location in the first filtered signal is obtained.
In the embodiment of the present application, the first filtered signal includes a plurality of points ordered according to the occurrence time, and the first filtered signal is a set of the plurality of points ordered according to the occurrence time. A point location refers to a point in the first filtered signal where an occurrence time is located, such that in the first filtered signal there is an amplitude at a point location, the amplitudes of the plurality of points constituting the first filtered signal. One point corresponds to one average instantaneous frequency, and a set of the average instantaneous frequencies of the plurality of points is an average instantaneous frequency change curve of the first filtering signal.
In some embodiments of the present application, obtaining the average instantaneous frequency of each point in the first filtered signal may include: determining a plurality of maximum value points ordered according to the occurrence time and a plurality of minimum value points ordered according to the occurrence time in the first filtering signal; determining a first time span t between each preset number of the plurality of maximum points in the plurality of maximum points 1 The method comprises the steps of carrying out a first treatment on the surface of the Determining a second time span t between each preset number of the plurality of minimum value points 2 . For example, the preset number M may have a value greater than or equal to 50.
Further, according to the preset number, the first time span t 1 And a second time span t 2 An average instantaneous frequency of each point in the first filtered signal is determined. Specific: the average instantaneous frequency of a single point location in the first filtered signal is calculated using the following equation: 2M/(t) 1 +t 2 ). Of course, other formulas may be used to calculate the average instantaneous frequency of a single point in the first filtered signal, such as M/(t1+t2), which is not limited herein. It should be noted that, when calculating the average instantaneous frequency of a single point location, the rank of the preset number of the plurality of maximum points in the plurality of maximum points ordered according to the occurrence time is the same as the rank of the preset number of the plurality of minimum points in the plurality of minimum points ordered according to the occurrence time, and the description is not repeated here.
Referring to fig. 10 to 12, fig. 10 shows a plurality of maxima in the first filtered signal of fig. 9, which are ordered by occurrence time, fig. 11 shows occurrence time of a plurality of maxima in fig. 10, and fig. 12 shows a first time span t of each point in the first filtered signal of fig. 5 1 And a second time span t 2 Average value (t) 1 +t 2 ) The preset number M employed in FIG. 12 has a value of 50.
In some embodiments of the present application, after determining the plurality of maximum points ordered by time of occurrence and the plurality of minimum points ordered by time of occurrence in the first filtered signal, the method may further include: and deleting extreme points with too small extreme intervals. In general, when the extremum interval is smaller than 4 points, the extremum interval is determined to be too small. It can be understood that, based on the above-mentioned current modulation method, extreme points with too small intervals do not appear in the first filtered signal, and if extreme points with smaller intervals appear, it indicates that the extreme points with smaller intervals are caused by noise in the first filtered signal, so that the noise can be eliminated by deleting the extreme points with too small intervals of extreme values, so that the first filtered signal is more accurate.
In some embodiments of the present application, after filtering the modulated current signal to obtain a first filtered signal, the method may further include: detecting whether the amplitude of the first filtering signal is larger than a preset amplitude; if the amplitude of the first filtering signal is smaller than or equal to the preset amplitude, judging that the first filtering signal is null information; if the amplitude of the first filtered signal is greater than the preset amplitude, determining that the first filtered signal is not null information, and performing the step of obtaining the average instantaneous frequency of each point in the first filtered signal, the specific description can be referred to above, and details are not repeated here.
704. And obtaining an average instantaneous frequency change curve of the first filtering signal according to the average instantaneous frequency of each point position in the first filtering signal.
In the embodiment of the present application, the average instantaneous frequency change curve of the first filtered signal includes an average instantaneous frequency of each point in the first filtered signal. The average instantaneous frequency variation curve of the first filtered signal of fig. 9 is shown in fig. 13 according to the above formula 2M/(t1+t2).
In some embodiments of the present application, after obtaining the average instantaneous frequency variation curve of the first filtered signal according to the average instantaneous frequency of each point in the first filtered signal, the method further includes: detecting whether the average instantaneous frequency change curve of the first filtering signal only comprises frequency components approximate to the central frequency of the first band-pass filter or not, and detecting whether the frequency fluctuation amplitude of the average instantaneous frequency change curve of the first filtering signal is smaller than a preset frequency fluctuation amplitude (generally the value is 2Hz or not); if the average instantaneous frequency change curve of the first filtered signal includes only a frequency component approximating the center frequency of the first band-pass filter, or the frequency fluctuation amplitude of the average instantaneous frequency change curve of the first filtered signal is smaller than the preset frequency fluctuation amplitude, it is determined that the first filtered signal includes only a frequency component approximating the center frequency of the first band-pass filter, and it is determined that the numerical value information of the modulated current signal is "0". If the average instantaneous frequency variation curve of the first filtered signal does not include only the frequency component approximating the center frequency of the first band-pass filter, and the frequency fluctuation width of the average instantaneous frequency variation curve of the first filtered signal is greater than or equal to the preset frequency fluctuation width, step 705 is performed.
705. And determining topology information of the equipment according to the frequency peak value and the frequency valley value in the average instantaneous frequency change curve.
It can be understood that the modulated current signal is formed by sequentially connecting a plurality of frequency components, frequency fluctuation exists between different frequency components, and frequency peak values and frequency valley values in the average instantaneous frequency variation curve reflect the frequency fluctuation condition in the average instantaneous frequency variation curve, so that the total number, i.e. the first number, of the frequency components in the modulated current signal can be determined according to the frequency peak values and the frequency valley values in the average instantaneous frequency variation curve.
In some embodiments of the application, determining the first number of frequency components in the modulated current signal from the frequency peaks and frequency valleys in the average instantaneous frequency variation curve may include: determining the number of frequency peaks and the number of frequency troughs in the average instantaneous frequency change curve according to the frequency peaks and the frequency troughs in the average instantaneous frequency change curve; the sum of the number of frequency peaks and the number of frequency valleys is determined as a first number of frequency components in the modulated current signal. It will be appreciated that a frequency peak may represent a frequency component and a frequency valley may represent a frequency component, such that a first number of frequency components in the modulated current signal may be determined based on a sum of the number of frequency peaks and the number of frequency valleys.
Taking fig. 13 as an example, in the average instantaneous frequency variation curve of the first filtered signal in fig. 13, besides the beginning position and the end position being near the center frequency 777Hz of the first band-pass filter, there are three frequency valleys and two frequency peaks, the sum of the number of frequency peaks and the number of frequency valleys is 5, which is near 762Hz, 765Hz, 768Hz, 780Hz, 783Hz, respectively, and which is exactly equal to 6 frequency components (827 Hz, 812Hz, 830Hz, 815Hz, 833Hz, 818 Hz) in the modulated current signal, respectively, minus 50Hz. It can be seen that the first number of frequency components in the modulated current signal is 6.
Further, according to the first number and the preset coding mode, topology information of the equipment is determined. Specifically, according to the logic in the current modulation method, when the first number is 6, the numerical information of the modulated current signal can be reversely deduced to be '5', and the numerical information '5' is decoded according to a preset encoding mode, so that the topology information of the device can be obtained. For example, when the preset encoding mode is a 10-ary encoding mode, the decoding mode is a 10-ary decoding mode. The principle of 10-ary decoding is similar to that of binary decoding and will not be described in detail here.
In some embodiments of the present application, to make the determined topology information more accurate, after obtaining the modulated current signal, the method may further include: filtering the modulated current signal through a second band-pass filter to obtain a second filtered signal, wherein the center frequency of the second band-pass filter is the first frequency or the second frequency, and the center frequency of the second band-pass filter is different from the center frequency of the first band-pass filter, for example, when the center frequency of the first band-pass filter is f1-50Hz, the center frequency of the second band-pass filter is f1+50Hz; obtaining average instantaneous frequency of each point bit in the second filtering signal; obtaining an average instantaneous change curve of the second filtering signal according to the average instantaneous frequency of each point position in the second filtering signal; the specific steps for determining the second number of frequency components in the modulated current signal according to the frequency peaks and frequency valleys in the average instantaneous frequency variation curve of the second filtered signal are similar to the steps for determining the first number, and are not described here in detail.
Further, determining topology information of the device according to the first number and the preset encoding mode may include: if the second number is the same as the first number, the first number and the second number are determined to be accurate, and the topology information of the device is determined according to the first number or the second number and a preset coding mode. According to the first number or the second number and the preset coding mode, topology information of the equipment is determined, and specifically, the decoding mode corresponding to the preset coding mode is adopted for decoding. And when the second quantity is different from the first quantity, judging that the first quantity and the second quantity are inaccurate, and outputting prompt information for manually detecting whether current modulation or demodulation is wrong.
Referring to fig. 14, fig. 14 shows an average instantaneous frequency variation curve of the second filtered signal, the second band-pass filter having a center frequency of 827hz+50hz=877hz, a bandwidth of 30Hz, and a passband of [860Hz,890hz ], it can be seen that the second number of frequency components in the modulated current signal is also 6, which is the same as the first number determined from the average instantaneous frequency variation curve of the first filtered signal in fig. 13.
According to the current demodulation method for topology identification, the frequency peak value and the frequency valley value in the modulated current signal can be correspondingly set according to the numerical information for topology identification, so that more information can be carried in the modulated current signal, the time required for transmission can be reduced, and the power consumption of a circuit for injecting modulated current can be reduced. Compared with demodulation modes such as Fourier transform and wavelet analysis, the embodiment of the application adopts filtering and average instantaneous frequency for demodulation, so that the demodulation is simpler.
In order to better implement the current demodulation method for topology identification in the embodiment of the present application, on the basis of the current demodulation method for topology identification, a current demodulation device 1500 for topology identification is further provided in the embodiment of the present application. As shown in fig. 15, the current demodulation device 1500 includes:
A first acquisition unit 1501 for acquiring a modulated current signal including topology information of a device;
the filtering unit 1502 is configured to perform filtering processing on the modulated current signal through a first band-pass filter to obtain a first filtered signal, where a center frequency of the first band-pass filter is a first frequency or a second frequency, the first frequency is a difference value between a preset center frequency and a preset power frequency, the second frequency is a sum value of the preset center frequency and the preset power frequency, and the preset center frequency is used for modulating the modulated current signal;
a calculating unit 1503, configured to obtain an average instantaneous frequency of each point in the first filtered signal; obtaining an average instantaneous frequency change curve of the first filtering signal according to the average instantaneous frequency of each point position in the first filtering signal;
a determining unit 1504 is configured to determine topology information of the device according to the frequency peak and the frequency valley in the average instantaneous frequency variation curve.
According to the current demodulation device 1500 provided by the embodiment of the application, the first number of frequency components in the modulated current signal can be correspondingly set according to the numerical information for topology identification, so that more information can be carried in the modulated current signal, the time required for transmission can be reduced, and the power consumption of a circuit for injecting modulated current can be reduced.
In some embodiments of the present application, the calculating unit 1503 is specifically configured to: determining a plurality of maximum value points ordered according to the occurrence time and a plurality of minimum value points ordered according to the occurrence time in the first filtering signal; determining a first time span between each preset number of the plurality of maximum points in the plurality of maximum points; determining a second time span between each preset number of the plurality of minimum points in the plurality of minimum points; and determining the average instantaneous frequency of each point in the first filtering signal according to the preset quantity, the first time span and the second time span.
In some embodiments of the present application, the determining unit 1504 is specifically configured to: determining the number of frequency peaks and the number of frequency troughs in the average instantaneous frequency change curve according to the frequency peaks and the frequency troughs in the average instantaneous frequency change curve; determining a sum of the number of frequency peaks and the number of frequency valleys as a first number of frequency components in the modulated current signal; and determining topology information of the equipment according to the first quantity and a preset coding mode.
In some embodiments of the present application, the current demodulation apparatus 1500 is further configured to: filtering the modulated current signal through a second band-pass filter to obtain a second filtered signal, wherein the center frequency of the second band-pass filter is the first frequency or the second frequency, and the center frequency of the second band-pass filter is different from the center frequency of the first band-pass filter; obtaining average instantaneous frequency of each point bit in the second filtering signal; obtaining an average instantaneous change curve of the second filtering signal according to the average instantaneous frequency of each point position in the second filtering signal; determining a second number of frequency components in the modulated current signal based on the frequency peaks and frequency valleys in the average instantaneous frequency variation curve of the second filtered signal;
The determining unit 1504 is specifically configured to: if the second number is the same as the first number, determining topology information of the device according to the first number or the second number and a preset coding mode.
In order to better implement the current modulation method for topology identification in the embodiment of the present application, on the basis of the current modulation method for topology identification, a current modulation device 1600 for topology identification is also provided in the embodiment of the present application. As shown in fig. 16, the current modulation device 1600 includes:
a second acquisition unit 1601 configured to acquire topology information of the device;
the encoding unit 1602 is configured to encode topology information by using a preset encoding manner, so as to obtain a frequency peak value and a frequency valley value in a current signal to be modulated;
a modulating unit 1603, configured to perform current modulation processing according to the frequency peak value and the frequency valley value, so as to obtain a modulated current signal.
According to the current modulation device 1600 provided by the embodiment of the application, the first number of frequency components in the modulated current signal can be correspondingly set according to the numerical information for topology identification, so that more information can be carried in the modulated current signal, the time required for transmitting can be reduced, and the power consumption of a circuit for injecting modulated current can be reduced.
In some embodiments of the present application, the current modulation apparatus 1600 is further configured to: transmitting a modulated current signal; the duration of the transmission of the first signal segment and the last signal segment in the modulated current signal is T1 cycles, the duration of the transmission of the signal segments except the first signal segment and the last signal segment is T2 cycles, and T2 is not equal to T1.
In addition to the above-described current modulation/demodulation method and apparatus for topology identification, the embodiment of the present application further provides an electronic device, which integrates at least one of the current demodulation apparatus 1500 and the current modulation apparatus 1600 provided in the embodiment of the present application, where the electronic device includes:
one or more processors;
a memory; and
one or more applications, wherein the one or more applications are stored in the memory and configured to perform the steps of any of the embodiments of the current demodulation/modulation method for topology identification described above by the processor.
As shown in fig. 17, a schematic structural diagram of an electronic device according to an embodiment of the present application is shown, specifically:
the electronic device may include one or more processors 1701, and further, the electronic device may include components such as memory 1702 of one or more computer-readable storage media. Optionally, the electronic device may further comprise a power supply 1703 and an input unit 1704. It will be appreciated by those skilled in the art that the electronic device structure shown in fig. 17 is not limiting of the electronic device and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components. Wherein:
The processor 1701 is a control center of the electronic device, connects various parts of the entire electronic device using various interfaces and lines, and performs various functions of the electronic device and processes data by running or executing software programs and/or modules stored in the memory 1702 and calling data stored in the memory 1702, thereby performing overall monitoring of the electronic device. Optionally, the processor 1701 may include one or more processing cores; preferably, the processor 1701 may integrate an application processor, wherein the application processor primarily handles operating systems, user interfaces, application programs, and the like.
The memory 1702 may be used to store software programs and modules that the processor 1701 executes to perform various functional applications and data processing by executing the software programs and modules stored in the memory 1702. The memory 1702 may primarily include a storage program area and a storage data area, wherein the storage program area may store an operating system, application programs required for at least one function, and the like; the storage data area may store data created according to the use of the electronic device, etc. In addition, memory 1702 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage device. Accordingly, the memory 1702 may also include a memory controller to provide access to the memory 1702 by the processor 1701.
The electronic device further includes a power supply 1703 for powering the various components, and preferably the power supply 1703 may be logically coupled to the processor 1701 by a power management system whereby charge, discharge, and power consumption management functions are performed by the power management system. The power supply 1703 may also include one or more of any components, such as a direct current or alternating current power supply, a recharging system, a power failure detection circuit, a power converter or inverter, a power status indicator, and the like.
The electronic device may also include an input unit 1704, which input unit 1704 may be used to receive entered numerical or character information and to generate signal inputs related to user settings and function control.
Although not shown, the electronic device may further include a display unit or the like, which is not described herein. In particular, in the embodiment of the present application, the processor 1701 in the electronic device loads executable files corresponding to the processes of one or more application programs into the memory 1702 according to the following instructions, and the processor 1701 executes the application programs stored in the memory 1702, so as to implement various functions as follows:
acquiring a modulation current signal, wherein the modulation current signal comprises topology information of equipment; filtering the modulated current signal through a first band-pass filter to obtain a first filtered signal, wherein the center frequency of the first band-pass filter is a first frequency or a second frequency, the first frequency is a difference value between a preset center frequency and a preset power frequency, the second frequency is a sum value of the preset center frequency and the preset power frequency, and the preset center frequency is used for modulating the modulated current signal; obtaining average instantaneous frequency of each point in the first filtering signal; obtaining an average instantaneous frequency change curve of the first filtering signal according to the average instantaneous frequency of each point position in the first filtering signal; and determining topology information of the equipment according to the frequency peak value and the frequency valley value in the average instantaneous frequency change curve.
Or, obtaining topology information of the equipment; adopting a preset coding mode to code topology information to obtain a frequency peak value and a frequency valley value in a current signal to be modulated; and carrying out current modulation processing according to the frequency peak value and the frequency valley value to obtain a modulated current signal.
To this end, embodiments of the present application provide a computer-readable storage medium, which may include: read Only Memory (ROM), random access Memory (RAM, random Access Memory), magnetic or optical disk, and the like. The computer readable storage medium stores a computer program, which can be loaded by a processor to execute steps in any of the dispatching methods of logistics vehicles provided by the embodiments of the present application. For example, the instructions may perform the steps of:
acquiring a modulation current signal, wherein the modulation current signal comprises topology information of equipment; filtering the modulated current signal through a first band-pass filter to obtain a first filtered signal, wherein the center frequency of the first band-pass filter is a first frequency or a second frequency, the first frequency is a difference value between a preset center frequency and a preset power frequency, the second frequency is a sum value of the preset center frequency and the preset power frequency, and the preset center frequency is used for modulating the modulated current signal; obtaining average instantaneous frequency of each point in the first filtering signal; obtaining an average instantaneous frequency change curve of the first filtering signal according to the average instantaneous frequency of each point position in the first filtering signal; and determining topology information of the equipment according to the frequency peak value and the frequency valley value in the average instantaneous frequency change curve.
Or, obtaining topology information of the equipment; adopting a preset coding mode to code topology information to obtain a frequency peak value and a frequency valley value in a current signal to be modulated; and carrying out current modulation processing according to the frequency peak value and the frequency valley value to obtain a modulated current signal.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.
The foregoing describes in detail a current demodulation method, modulation method, apparatus and medium for topology identification provided by the embodiments of the present application, and specific examples are applied herein to illustrate the principles and embodiments of the present application, where the foregoing examples are only used to help understand the method and core idea of the present application; also, those skilled in the art will appreciate that the present disclosure should not be construed as limited to the particular embodiments and application areas disclosed herein.
Claims (9)
1. A current demodulation method for topology identification, the method comprising:
acquiring a modulated current signal, wherein the modulated current signal comprises topology information of equipment;
Filtering the modulated current signal through a first band-pass filter to obtain a first filtered signal, wherein the central frequency of the first band-pass filter is a first frequency or a second frequency, the first frequency is a difference value between a preset central frequency and a preset power frequency, the second frequency is a sum value of the preset central frequency and the preset power frequency, and the preset central frequency is used for modulating the modulated current signal;
obtaining average instantaneous frequency of each point in the first filtering signal;
obtaining an average instantaneous frequency change curve of the first filtering signal according to the average instantaneous frequency of each point position in the first filtering signal;
determining the number of frequency peaks and the number of frequency troughs in the average instantaneous frequency change curve according to the frequency peaks and the frequency troughs in the average instantaneous frequency change curve;
determining the sum of the number of frequency peaks and the number of frequency troughs as a first number of frequency components in the modulated current signal;
and determining topology information of the equipment according to the first quantity and a preset coding mode.
2. The method of claim 1, wherein the obtaining the average instantaneous frequency of the points in the first filtered signal comprises:
Determining a plurality of maximum value points ordered by occurrence time and a plurality of minimum value points ordered by occurrence time in the first filtering signal;
determining a first time span between each preset number of the plurality of maximum points in the plurality of maximum points;
determining a second time span between each preset number of the plurality of minimum points;
and determining the average instantaneous frequency of each point in the first filtering signal according to the preset quantity, the first time span and the second time span.
3. The method of claim 2, wherein the average instantaneous frequency, the preset number, the first time span, and the second time span satisfy the following formulas:
F＝2M/(t 1 +t 2 )
wherein F is the average instantaneous frequency and M isThe preset number, t 1 For the first time span, t 2 For said second time span.
4. The method of claim 1, wherein after the obtaining the modulated current signal, further comprising:
filtering the modulated current signal through a second band-pass filter to obtain a second filtered signal, wherein the center frequency of the second band-pass filter is the first frequency or the second frequency, and the center frequency of the second band-pass filter is different from the center frequency of the first band-pass filter;
Obtaining average instantaneous frequency of each point bit in the second filtering signal;
obtaining an average instantaneous change curve of the second filtering signal according to the average instantaneous frequency of each point position in the second filtering signal;
determining a second number of frequency components in the modulated current signal based on frequency peaks and frequency valleys in an average instantaneous frequency variation curve of the second filtered signal;
the determining topology information of the device according to the first number and the preset coding mode includes:
and if the second number is the same as the first number, determining topology information of the equipment according to the first number or the second number and the preset coding mode.
5. A current modulation method for topology identification, comprising:
obtaining topology information of equipment;
encoding the topology information by adopting a preset encoding mode to obtain the numerical information of the current signal to be modulated;
determining the target number of frequency components in the current signal to be modulated according to the numerical information;
determining the frequency values of a plurality of frequency components of the target quantity to obtain a frequency peak value and a frequency valley value in a current signal to be modulated;
And carrying out current modulation processing according to the frequency peak value and the frequency valley value to obtain a modulated current signal.
6. The method of claim 5, wherein the modulated current signal comprises a plurality of signal segments connected in sequence, the frequencies in the same signal segment are the same, the frequencies of two adjacent signal segments are different, and the frequencies of the first signal segment and the last signal segment in the modulated current signal are the same.
7. The method of claim 6, wherein the method further comprises:
transmitting the modulated current signal;
the duration of the transmission of the first signal segment and the last signal segment in the modulated current signal is T1 periods, the duration of the transmission of the signal segments except the first signal segment and the last signal segment is T2 periods, and T2 is not equal to T1.
8. An electronic device, comprising:
one or more processors;
a memory; and
one or more applications, wherein the one or more applications are stored in the memory and configured to be executed by the processor to implement the current demodulation method for topology identification of any one of claims 1 to 4 or to implement the current modulation method for topology identification of any one of claims 5 to 7.
9. A computer-readable storage medium, on which a computer program is stored, the computer program being loaded by a processor to perform the steps in the current demodulation method for topology identification of any one of claims 1 to 4, or to perform the current modulation method for topology identification of any one of claims 5 to 7.
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