Topology identification method, system and equipment based on power line carrier and characteristic current and medium

Abstract

The invention discloses a topology identification method, system and device based on power line carrier and characteristic current, and a medium, and the method comprises the steps: enabling a characteristic current signal to send an instruction and broadcast the instruction to a characteristic current identification node and a plurality of to-be-identified nodes in a power distribution network through a power line broadband carrier communication network, injecting a characteristic current signal into a power supply line where each to-be-identified node is located in parallel; performing current sampling on a plurality of power supply lines according to the characteristic current signal sending instruction and the characteristic current identification node to obtain a multi-phase current signal; detecting the characteristic current signal of each phase of current signal, and acquiring the detection time of each phase of current signal according to the detection result; and sending an instruction according to the detection time and the characteristic current signal to obtain a topological relation between each node to be identified and the power distribution network. The efficiency and the accuracy of topology identification are improved.

Description

Technical Field

[0001] The present invention relates to the field of electric power automation technology, and in particular to a topology identification method, system, device and medium based on power carrier and characteristic current. Background Art

[0002] Low-voltage distribution network topology identification is the process of using technical means to identify the connections between devices in a low-voltage distribution network (such as transformers, distribution boxes, and meters) to form a network structure diagram. Accurate topology identification is crucial for distribution network operations and maintenance, fault location, line loss analysis, and power quality optimization.

[0003] Manually recording connection relationships through on-site surveys and drawing verification is inefficient and prone to errors. To improve the efficiency of topology identification, topology identification technology based on signal injection has gradually been applied to the topology identification process of distribution networks. This technology adds a functional module to the circuit board of the communication module embedded in the smart meter or other power equipment, which can generate a characteristic current signal that meets certain frequency domain rules between the neutral and live wires of the line through resistor switching. In addition, a characteristic current signal identification device is installed at each branch position of the line to perform real-time sampling and characteristic current signal identification. By recording the time stamp of the characteristic current signal and comparing it with the time stamp of the characteristic current signal sent by the network node, the physical topology of the line is drawn.

[0004] However, in topology identification technology based on signal injection, the time synchronization errors among the three types of nodes—the control terminal device, the characteristic current signal sending device, and the characteristic current signal identification device—are significant. This results in the substation control terminal device being forced to configure the transmission time in the "characteristic current signal sending instruction" message as FF FF FF FF FF FF. This means that the sending device, without having to determine the time, immediately transmits the characteristic current signal upon receiving the message. To avoid misjudgments, the control terminal device is forced to configure a larger current signal transmission interval for the two adjacent devices to be topology identified. This results in a longer time to complete the entire substation topology identification, thus affecting the efficiency of topology identification. Furthermore, the characteristic current signal detection device cannot know the transmission time of the characteristic current signal, so its receiver must remain in a blind detection state. This not only wastes detection device resources but also makes it difficult to achieve a good balance between false alarm rate and false negative rate. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention discloses a topology identification method, system, device and medium based on power carrier and characteristic current, which are used to improve the efficiency and accuracy of topology identification.

[0006] To achieve the above objectives, in a first aspect, the present invention discloses a topology identification method based on power carrier and characteristic current, comprising:

[0007] Broadcasting a characteristic current signal sending instruction to a characteristic current identification node and multiple nodes to be identified in the distribution network through a power line broadband carrier communication network;

[0008] Injecting a characteristic current signal into the power supply line where each of the nodes to be identified is located in parallel according to the characteristic current signal sending instruction and the multiple nodes to be identified;

[0009] Performing current sampling on multiple power supply lines according to the characteristic current signal sending instruction and the characteristic current identification node to obtain multi-phase current signals;

[0010] Performing detection of the characteristic current signal on the current signal of each phase, and obtaining the detection time of the current signal of each phase according to the detection result;

[0011] A topological relationship between each of the nodes to be identified and the power distribution network is obtained according to the detection time and the characteristic current signal sending instruction.

[0012] The present invention discloses a topology identification method based on power line carrier and characteristic current. It uses a power line broadband carrier communication network to achieve synchronous reception of instructions by multiple nodes, so that the node performing characteristic current signal identification obtains the transmission time of the characteristic current signal, solving the problem of resource occupation caused by the characteristic current identification node having no way of knowing the transmission time. At the same time, the instruction is broadcast through the power line broadband carrier communication network, and the Wanli calendar time is replaced by the base time of the power line broadband carrier communication network to achieve time synchronization and improve the accuracy of topology identification. First, the broadcast characteristic current signal transmission instruction enables all nodes to operate based on the same time reference, avoiding the excessively long signal transmission interval caused by time asynchrony in traditional methods. Second, characteristic current signals are injected into the power supply lines of multiple nodes to be identified in parallel, shortening the overall identification time through signal interleaving. The characteristic current identification node synchronously samples the multiphase current signals and detects the arrival time of the characteristic current signals. The time difference is accurately calculated based on the time reference in the instruction, thereby determining the physical connection relationship of the node to be identified in the distribution network. This process reduces the signal transmission interval through instruction synchronization and parallel processing, and uses time difference analysis to avoid continuous blind detection of detection equipment, thereby improving efficiency and reducing resource consumption.

[0013] As a preferred example, the method of broadcasting the characteristic current signal sending instruction to the characteristic current identification node and multiple nodes to be identified in the power distribution network through the power line broadband carrier communication network includes:

[0014] Obtain an original beacon signal of the power line broadband carrier communication network, and add a management message corresponding to a characteristic current signal sending instruction to the original beacon signal to obtain a new beacon signal; wherein the management message is mounted in a payload field of the new beacon signal; the characteristic current signal sending instruction includes a network communication address corresponding to each of a plurality of nodes to be identified in sequence, a power line broadband carrier communication network reference time when the first of the plurality of nodes to be identified in sequence sends a characteristic current signal, characteristic code information corresponding to the characteristic current signal, and a characteristic current sending duration;

[0015] The new beacon signal is broadcast to each node in the power distribution network through the power line broadband carrier communication network; wherein the nodes include the characteristic current identification node and each of the nodes to be identified.

[0016] In the above scheme, a unified timing control framework is constructed by embedding management messages for executing characteristic signal sending instructions in the original beacon signal. Specifically, a new management message is added to the payload field of the original beacon signal so that all nodes can synchronously obtain key parameters such as the reference time, characteristic code and sending duration. Among them, the association between the sorting of network communication addresses and the reference time provides a timing alignment basis for subsequent parallel injection signals; the clarification of characteristic code information and sending duration enables the detection equipment to accurately lock the signal window. By broadcasting the new beacon signal through the power line, the synchronous reception of the instruction parameters by nodes across the entire network is achieved, eliminating the redundancy of signal sending intervals caused by time asynchrony in traditional schemes, and at the same time, the detection equipment does not need to conduct continuous blind detection, but only needs to sample within the preset time window. This design solves the time synchronization problem of multi-node collaboration by reusing the payload field of the existing communication protocol without adding additional communication overhead.

[0017] As a preferred example, the step of sending an instruction and multiple nodes to be identified according to the characteristic current signal, and injecting a characteristic current signal into the power supply line where each node to be identified is located in parallel, includes:

[0018] Broadcasting the characteristic current signal sending instruction to a plurality of nodes to be identified on power supply lines of different phases according to the power line broadband carrier communication network;

[0019] Determine the time for each of the nodes to be identified to inject a characteristic current signal into the power supply line where it is located according to the power line broadband carrier communication network reference time and a preset time difference;

[0020] According to the sending time and the multiple nodes to be identified, the characteristic current signal is injected into the multiple power supply lines in parallel through signal interleaving.

[0021] In the above scheme, efficient topology identification is achieved through the optimization of multi-node collaborative time control and signal injection methods. First, the instructions are broadcast to the nodes to be identified on different phase lines through the power line broadband carrier communication network to ensure that each node receives a unified time reference and eliminate the problem of inconsistent instruction reception caused by communication delays. Secondly, the sending time of each node is calculated based on the network reference time and the preset time difference, and the characteristic current signal that originally needs to be sent serially is time-shifted according to the phase distribution, which not only ensures the time independence of the sending action of each node, but also avoids mutual interference of multi-phase signals. Finally, the characteristic current signal is injected in parallel using a signal interleaving method, so that the characteristic current signals on different phase lines are staggered on the time axis but executed in parallel as a whole, which not only shortens the overall signal injection cycle, but also avoids signal confusion caused by the superposition of multi-phase currents through time dislocation, thereby reducing the impact of time synchronization errors while improving the efficiency of topology identification.

[0022] As a preferred example, the sending of the instruction according to the characteristic current signal and the characteristic current identification node sampling currents of multiple power supply lines where the characteristic current identification node is located to obtain a multi-phase current signal includes:

[0023] When it is detected that the beacon signal received by the characteristic current identification node is the new beacon signal, converting the current sampling state of the characteristic current identification node to an on state;

[0024] Determining a sampling time of the characteristic current identification node according to a power line broadband carrier communication network reference time in the characteristic current signal sending instruction;

[0025] Determining a sampling duration of the characteristic current identification node according to the characteristic current sending duration in the characteristic current signal sending instruction and the total number of the network communication addresses;

[0026] According to the sampling time and the sampling duration, currents of the power supply lines of different phases are sampled respectively through the characteristic current identification node to obtain multi-phase current signals.

[0027] In the above scheme, accurate synchronous sampling is achieved by coordinating the sampling time of the characteristic current identification node with the reference time of the characteristic current signal sending instruction to avoid continuous blind detection. Specifically, when the characteristic current identification node receives a new beacon signal, the sampling state is immediately turned on to ensure that the sampling function is started only during the valid period, reducing resource consumption. The sampling time is determined based on the reference time of the power line broadband carrier communication network, so that the sampling window is strictly aligned with the characteristic current signal sending period, eliminating time synchronization errors. The sampling time is calculated by the characteristic current sending duration and the number of network addresses, and it can dynamically adapt to node networks of different sizes to ensure complete coverage of the signal sending cycle of all nodes to be identified. Current sampling is performed on power supply lines of different phases respectively, which can distinguish the propagation path of the characteristic current signal in each phase line, and provide data support in the phase dimension for subsequent topological relationship analysis.

[0028] As a preferred example, the sending of the instruction according to the characteristic current signal and the characteristic current identification node sampling the currents of the multiple power supply lines where the characteristic current identification node is located to obtain a multi-phase current signal further includes:

[0029] According to the signal interleaving transmission method of multiple characteristic current signals, the sampling signals of the non-characteristic current segmented signal time period in the current signal of each phase are discarded to obtain the current signals after the sampling signals are discarded in multiple phases; wherein, the duration of the current signal after the sampling signals are discarded in each phase is consistent with the characteristic current transmission duration.

[0030] In the above scheme, accurate screening of the sampled data is achieved based on the signal interleaving transmission method of the characteristic current signal. Among them, according to the signal interleaving transmission method, the detection equipment can clearly identify the effective time period of the characteristic current, actively discard the time period data that is not related to the characteristic current, and only retain the valid signals within the characteristic current transmission duration. This selective discarding mechanism not only greatly reduces the amount of data that needs to be processed, but also avoids the interference of non-characteristic current signals on the detection process. By strictly matching the duration of the processed current signal with the characteristic current transmission duration, the benchmark uniformity of the time scale comparison is ensured, thereby reducing the risk of misjudgment due to invalid data. The core of this solution is to use the known signal transmission method to dynamically adjust the sampling data processing range, which not only solves the resource consumption problem of continuous blind detection of the detection equipment, but also improves the detection accuracy and timeliness through data filtering.

[0031] As a preferred example, the detecting the characteristic current signal of each phase current signal and obtaining the detection time of each phase current signal according to the detection result includes:

[0032] Detecting the characteristic code information on the current signal of each phase;

[0033] For the current signal of any phase;

[0034] When it is detected that the current signal of the phase has the characteristic code information, the signal detection time of the current signal of the phase by the characteristic current identification node is obtained.

[0035] In the above scheme, accurate identification and time synchronization of characteristic current signals are achieved by combining characteristic code information detection with time stamp acquisition. Specifically, characteristic code information is first detected for each phase current signal. The characteristic code information serves as a pre-agreed signal identifier, which enables the detection equipment to identify valid signals through specific coding, avoiding invalid detection of non-characteristic current signals, thereby reducing the continuous workload of the detection equipment. When a current signal containing characteristic code information is detected, the detection time point of the phase current signal is immediately recorded. This time stamp recording action forms a corresponding relationship with the reference time in the characteristic current signal sending instruction. By using characteristic code detection as a prerequisite for triggering time stamp acquisition, the accuracy of time recording is guaranteed, and the waste of storage resources caused by the detection equipment continuously recording all current signals is avoided. This technical means, through the dual effects of characteristic code screening and time stamp triggering mechanism, significantly improves the resource utilization efficiency of the detection equipment while ensuring the accuracy of topology recognition.

[0036] As a preferred example, the acquiring of the topological relationship between each of the nodes to be identified and the distribution network according to the detection time and the characteristic current signal sending instruction includes:

[0037] The signal detection time corresponding to the current signal of any phase;

[0038] A time difference between the signal detection time and the sending time of the node to be identified corresponding to the current signal of the phase is obtained, so as to determine a topological relationship between the node to be identified and the power distribution network according to the time difference.

[0039] In the above scheme, a correlation between signal detection time and transmission time is established, utilizing time difference as the core basis for topology determination. First, the signal detection time corresponding to each phase current signal is processed independently, ensuring the independent analysis capability of signals from different phases in a multi-phase power supply line. Second, by obtaining the difference between the signal detection time and the transmission time of the node to be identified, the physical connection distance is converted into a quantifiable time parameter, thereby eliminating the interference of time synchronization errors on topology determination. Finally, based on the correspondence between the time difference and the physical length of the line, the specific connection location of the node to be identified in the distribution network is directly derived, achieving accurate topology identification without the need for continuous blind detection. The phrase "determined based on time difference" indicates that there is a preset mapping rule between time difference and topology. For example, judgment logic is established through a time difference threshold or propagation delay model, so that the detection equipment only needs to capture characteristic signals within a specific time window, significantly reducing resource consumption.

[0040] In a second aspect, the present invention discloses a topology identification system based on power carrier and characteristic current, comprising a signal broadcast module, a characteristic current injection module, a current sampling module, a characteristic current detection module and a topology identification module;

[0041] The signal broadcast module is used to broadcast the characteristic current signal sending instruction to the characteristic current identification node and multiple nodes to be identified in the power distribution network through the power line broadband carrier communication network;

[0042] The characteristic current injection module is used to send instructions and multiple nodes to be identified according to the characteristic current signal, and inject characteristic current signals into the power supply line where each node to be identified is located in parallel;

[0043] The current sampling module is used to perform current sampling on multiple power supply lines according to the characteristic current signal sending instruction and the characteristic current identification node to obtain multi-phase current signals;

[0044] The characteristic current detection module is used to detect the characteristic current signal of each phase of the current signal, and obtain the detection time of the current signal of each phase according to the detection result;

[0045] The topology identification module is used to obtain the topological relationship between each of the nodes to be identified and the power distribution network according to the detection time and the characteristic current signal sending instruction.

[0046] In a third aspect, the present invention discloses a terminal device comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements a topology identification method based on power carrier and characteristic current as described in the first aspect.

[0047] In a fourth aspect, the present invention discloses a computer-readable storage medium, comprising: a stored computer program, wherein, when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute a topology identification method based on power carrier and characteristic current as described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the implementation. Obviously, the drawings described below are only some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0049] Figure 1 This is a flow chart of a topology identification method based on power carrier and characteristic current disclosed in an embodiment of the present invention;

[0050] Figure 2 This is a schematic diagram of the structure of a topology identification system based on power carrier and characteristic current disclosed in an embodiment of the present invention;

[0051] Figure 3 This is a schematic diagram of a multi-level associated tree routing topology structure of a power line carrier broadband communication network disclosed in another embodiment of the present invention;

[0052] Figure 4 1 is a schematic diagram of time slot division of a beacon signal within a beacon period disclosed in another embodiment of the present invention;

[0053] Figure 5 is a signal structure diagram of a beacon signal disclosed in another embodiment of the present invention;

[0054] Figure 6 This is a flowchart of a topology identification method based on power carrier and characteristic current disclosed in another embodiment of the present invention;

[0055] Figure 7 This is a schematic diagram of interleaved transmission of multiple characteristic current signals disclosed in another embodiment of the present invention. DETAILED DESCRIPTION

[0056] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0057] Example 1

[0058] Reference Figure 1 To improve the efficiency and accuracy of topology identification of nodes to be identified, this embodiment discloses a topology identification method based on power carrier and characteristic current, which mainly includes:

[0059] Step 101: broadcast a characteristic current signal sending instruction to a characteristic current identification node and multiple nodes to be identified in a power distribution network via a power line broadband carrier communication network.

[0060] In this embodiment, this step mainly includes: obtaining the original beacon signal of the power line broadband carrier communication network, and adding a management message corresponding to the characteristic current signal sending instruction to the original beacon signal to obtain a new beacon signal; wherein, the management message is mounted in the payload field of the new beacon signal; the characteristic current signal sending instruction includes the network communication address corresponding to each of the multiple nodes to be identified in sequence, the power line broadband carrier communication network reference time when the first of the multiple nodes to be identified in sequence sends the characteristic current signal, the characteristic code information corresponding to the characteristic current signal and the characteristic current sending duration; the new beacon signal is broadcast to each node in the distribution network through the power line broadband carrier communication network; wherein, the node includes the characteristic current identification node and each of the nodes to be identified.

[0061] In this embodiment, the steps construct a unified timing control framework by embedding a management message for executing a characteristic signal sending instruction in the original beacon signal. Specifically, a new management message is added to the payload field of the original beacon signal so that all nodes can synchronously obtain key parameters such as the reference time, characteristic code and sending duration. Among them, the association between the sorting of network communication addresses and the reference time provides a timing alignment basis for subsequent parallel injection signals; the clarification of characteristic code information and sending duration enables the detection equipment to accurately lock the signal window. By broadcasting the new beacon signal through the power line, the synchronous reception of the instruction parameters by all nodes in the network is achieved, eliminating the redundancy of the signal sending interval caused by time asynchrony in the traditional solution, and at the same time, the detection equipment does not need to perform continuous blind detection, but only needs to sample within the preset time window. This design solves the time synchronization problem of multi-node collaboration by reusing the payload field of the existing communication protocol without adding additional communication overhead.

[0062] Step 102: Sending instructions based on the characteristic current signal and the plurality of nodes to be identified, and injecting characteristic current signals into the power supply line where each of the nodes to be identified is located in parallel.

[0063] In this embodiment, this step mainly includes: broadcasting the characteristic current signal sending instruction to multiple nodes to be identified located on power supply lines of different phases according to the power line broadband carrier communication network; determining the sending time of each node to be identified to inject the characteristic current signal into the power supply line where it is located according to the power line broadband carrier communication network reference time and the preset time difference; according to the sending time and multiple nodes to be identified, injecting the characteristic current signal into multiple power supply lines in parallel through signal interleaving.

[0064] In this embodiment, the above steps are optimized through the time control and signal injection method of multi-node collaboration to achieve efficient topology identification. First, the instructions are broadcast to the nodes to be identified on different phase lines through the power line broadband carrier communication network to ensure that each node receives a unified time base, eliminating the problem of inconsistent instruction reception caused by communication delays. Secondly, the sending time of each node is calculated based on the network reference time and the preset time difference, and the characteristic current signal that originally needs to be sent serially is time-shifted according to the phase distribution, which not only ensures the time independence of the sending action of each node, but also avoids mutual interference of multi-phase signals. Finally, the characteristic current signal is injected in parallel in a signal interleaving manner, so that the characteristic current signals on different phase lines are staggered on the time axis but executed in parallel as a whole, which not only shortens the overall signal injection cycle, but also avoids signal confusion caused by the superposition of multi-phase currents through time dislocation, thereby reducing the impact of time synchronization error while improving the efficiency of topology identification.

[0065] Step 103: Current sampling is performed on multiple power supply lines according to the characteristic current signal sending instruction and the characteristic current identification node to obtain multi-phase current signals.

[0066] In this embodiment, this step mainly includes: when it is detected that the beacon signal received by the characteristic current identification node is the new beacon signal, the current sampling state of the characteristic current identification node is converted to the on state; the sampling time of the characteristic current identification node is determined according to the power line broadband carrier communication network reference time in the characteristic current signal sending instruction; the sampling duration of the characteristic current identification node is determined according to the characteristic current sending duration in the characteristic current signal sending instruction and the total number of network communication addresses; according to the sampling time and the sampling duration, the power supply lines of different phases are sampled separately through the characteristic current identification node to obtain a multi-phase current signal.

[0067] Preferably, according to the signal interleaving transmission method of multiple characteristic current signals, the sampling signals of the non-characteristic current segmented signal time period in each phase of the current signal are discarded to obtain the current signals after the sampling signals are discarded in multiple phases; wherein, the duration of the current signal after the sampling signals are discarded in each phase is consistent with the characteristic current transmission duration.

[0068] In this embodiment, the above steps achieve precise synchronous sampling by coordinating the sampling time of the characteristic current identification node with the reference time of the characteristic current signal transmission instruction, avoiding continuous blind detection. Specifically, when the characteristic current identification node receives a new beacon signal, it immediately turns on the sampling state, ensuring that the sampling function is activated only during the valid period, thereby reducing resource consumption. The sampling time is determined based on the reference time of the power line broadband carrier communication network, so that the sampling window is strictly aligned with the characteristic current signal transmission period, eliminating time synchronization errors. The sampling period is calculated by calculating the characteristic current transmission duration and the number of network addresses, and can be dynamically adapted to node networks of different sizes to ensure complete coverage of the signal transmission cycle of all nodes to be identified. Current sampling is performed separately on power supply lines of different phases, which can distinguish the propagation path of the characteristic current signal in each phase line, providing phase-dimensional data support for subsequent topological relationship analysis. Preferably, the characteristic current signal is transmitted in an interleaved manner to achieve precise screening of the sampled data. In particular, the interleaved signal transmission method enables the detection device to clearly identify the valid period of the characteristic current, actively discard the data of the time period unrelated to the characteristic current, and only retain the valid signal within the characteristic current transmission duration. This selective discarding mechanism not only significantly reduces the amount of data that needs to be processed, but also prevents non-characteristic current signals from interfering with the detection process. By strictly matching the duration of the processed current signal with the characteristic current transmission duration, the benchmark uniformity of the time scale comparison is ensured, thereby reducing the risk of misjudgment due to invalid data. The core of this solution is to utilize known signal transmission methods to dynamically adjust the sampling data processing range. This not only solves the resource consumption problem of continuous blind detection of detection equipment, but also improves detection accuracy and timeliness through data filtering.

[0069] Step 104: Detect the characteristic current signal of the current signal of each phase, and obtain the detection time of the current signal of each phase according to the detection result.

[0070] In this embodiment, this step mainly includes: detecting the characteristic code information of the current signal of each phase; for the current signal of any phase; when it is detected that the current signal of the phase contains the characteristic code information, obtaining the signal detection time of the characteristic current identification node for the current signal of the phase.

[0071] In this embodiment, the above steps realize the accurate identification and time synchronization of the characteristic current signal by combining the characteristic code information detection with the time stamp acquisition. Specifically, the characteristic code information of each phase current signal is first detected. The characteristic code information serves as a pre-agreed signal identifier, so that the detection device can identify the valid signal through specific coding, avoid invalid detection of non-characteristic current signals, and thus reduce the continuous workload of the detection device. When a current signal containing characteristic code information is detected, the detection time point of the phase current signal is immediately recorded. This time stamp recording action forms a corresponding relationship with the reference time in the characteristic current signal sending instruction. By using the characteristic code detection as a prerequisite for triggering the time stamp acquisition, the accuracy of the time record is guaranteed, and the waste of storage resources caused by the detection device continuously recording all current signals is avoided. This technical means, through the dual effects of characteristic code screening and time stamp triggering mechanism, significantly improves the resource utilization efficiency of the detection device while ensuring the accuracy of topology recognition.

[0072] Step 105: Acquire a topological relationship between each of the nodes to be identified and the power distribution network according to the detection time and the characteristic current signal sending instruction.

[0073] In this embodiment, this step mainly includes: for the signal detection time corresponding to the current signal of any phase; obtaining the time difference between the signal detection time and the sending time of the node to be identified corresponding to the current signal of this phase, so as to determine the topological relationship between the node to be identified and the distribution network based on the time difference.

[0074] In this embodiment, the above steps establish a correlation between signal detection time and transmission time, and use time difference as the core basis for determining topology. First, the signal detection time corresponding to each phase current signal is processed independently to ensure the independent analysis capability of different phase signals in the multi-phase power supply line. Secondly, by obtaining the difference between the signal detection time and the transmission time of the node to be identified, the physical connection distance is converted into a quantifiable time parameter, thereby eliminating the interference of time synchronization error on topology determination. Finally, based on the correspondence between the time difference and the physical length of the line, the specific connection position of the node to be identified in the distribution network is directly deduced, and accurate topology identification without continuous blind detection is achieved. Among them, "determined according to the time difference" indicates that there is a preset mapping rule between the time difference and the topological relationship, such as establishing judgment logic through a time difference threshold or a propagation delay model, so that the detection equipment only needs to capture characteristic signals within a specific time window, significantly reducing resource consumption.

[0075] On the other hand, refer to Figure 2This embodiment also discloses a topology identification system based on power carrier and characteristic current, including a signal broadcasting module 201, a characteristic current injection module 202, a current sampling module 203, a characteristic current detection module 204 and a topology identification module 205.

[0076] The signal broadcast module 201 is used to broadcast the characteristic current signal sending instruction to the characteristic current identification node and multiple nodes to be identified in the power distribution network through the power line broadband carrier communication network.

[0077] The characteristic current injection module 202 is configured to send an instruction and multiple nodes to be identified according to the characteristic current signal, and inject a characteristic current signal into the power supply line where each node to be identified is located in parallel.

[0078] The current sampling module 203 is configured to perform current sampling on multiple power supply lines according to the characteristic current signal sending instruction and the characteristic current identification node to obtain multi-phase current signals.

[0079] The characteristic current detection module 204 is configured to detect the characteristic current signal of each phase of the current signal, and obtain the detection time of the current signal of each phase according to the detection result.

[0080] The topology identification module 205 is configured to obtain a topological relationship between each of the nodes to be identified and the power distribution network according to the detection time and the characteristic current signal sending instruction.

[0081] Based on the above-mentioned embodiment of the topology identification method based on power carrier and characteristic current, this embodiment also provides a terminal device, which includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements a topology identification method based on power carrier and characteristic current described in any embodiment.

[0082] For example, in this embodiment, the computer program may be divided into one or more modules, which are stored in the memory and executed by the processor to implement the present invention. The one or more module elements may be a series of computer program instruction segments capable of performing specific functions, and the instruction segments are used to describe the execution process of the computer program in the terminal device.

[0083] The terminal device may be a computing device such as a desktop computer, a notebook computer, a PDA, a cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0084] The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor, etc. The processor is the control center of the terminal device, connecting various parts of the entire terminal device using various interfaces and lines.

[0085] Based on the above method embodiment, this embodiment also provides a computer-readable storage medium, including a stored computer program, wherein, when the computer program is running, the device where the computer-readable storage medium is located is controlled to execute a topology identification method based on power carrier and characteristic current described in any method embodiment.

[0086] Wherein, the module / unit integrated in the device / terminal equipment, if implemented in the form of a software functional unit and sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the above-mentioned embodiment method can also be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, it can implement the steps of the above-mentioned various method embodiments. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc.

[0087] This embodiment discloses a topology identification method, system, device, and medium based on power line carrier and characteristic current. The method utilizes a power line broadband carrier communication network to enable multiple nodes to synchronously receive instructions, allowing nodes performing characteristic current signal identification to obtain the transmission time of the characteristic current signal. This solves the resource utilization problem caused by the characteristic current identification node's inability to know the transmission time. The instruction is simultaneously broadcast via the power line broadband carrier communication network, replacing the Wanli calendar year time with the network's own reference time, achieving time synchronization and improving the accuracy of topology identification. First, broadcasting the characteristic current signal transmission instruction enables all nodes to operate based on the same time reference, avoiding the long signal transmission intervals caused by time asynchrony in traditional methods. Second, characteristic current signals are injected into the power supply lines of multiple nodes to be identified in parallel, shortening the overall identification time through signal interleaving. The characteristic current identification node synchronously samples multiphase current signals and detects the arrival time of the characteristic current signals. The time difference is accurately calculated based on the time reference in the instruction, thereby determining the physical connection relationship of the node to be identified in the distribution network. This process reduces the signal transmission interval through instruction synchronization and parallel processing, and uses time difference analysis to avoid continuous blind detection of detection equipment, thereby improving efficiency and reducing resource consumption.

[0088] Example 2

[0089] In order to improve the efficiency and accuracy of distribution network topology identification, the automatic topology identification technology based on characteristic current injection in low-voltage substations has developed rapidly in recent years. The basic principle of this technology is to add a functional module to the circuit board of the communication module embedded in the smart meter or other power equipment, so that the power equipment with the added functional module becomes a characteristic current signal sending device that can generate a characteristic current signal that meets a certain frequency domain law between the neutral and live wires of the line through resistance switching. In addition, a characteristic current signal identification device is installed at each branch position of the line. The device samples the line current signal in real time and identifies the characteristic current signal, records the time stamp of the detected characteristic current signal, and compares and analyzes it with the time stamp of the characteristic current signal sent by the network node, thereby drawing the physical topology of the line.

[0090] Preferably, in this embodiment, a method for automatic topology identification technology based on characteristic current injection is provided, and the process of the method is as follows:

[0091] Step S1: a control terminal in the distribution network sends a characteristic current signal sending instruction message to a node to be topology identified in the distribution network.

[0092] In this embodiment, the control terminal of the distribution network to be topologically identified, i.e., the low-voltage distribution substation, uses a DL / T645 communication message to send a "characteristic current signal sending instruction" message to a node to be topologically identified in the distribution network, i.e., the distribution substation, so that the node to be topologically identified sends a characteristic current signal according to the message.

[0093] In this embodiment, the parameters of the characteristic current signal sent by the node to be topology identified are set according to existing standard technologies. The parameter settings of the characteristic current signal are shown in the following table:

[0094]

[0095] Referring to the parameters of the characteristic current signal shown in the above table, when the control terminal sends the message to the node to be topology identified, the detailed information format of the data field of the message is as shown in the following table:

[0096]

[0097]

[0098] In this embodiment, a message corresponding to the characteristic current signal sending instruction is sent to the node to be topology identified with reference to the message format shown in the above table.

[0099] Step S2: the node to be topology identified sends a characteristic current signal in a specified format at a specified time according to the message.

[0100] In this embodiment, the node to be topologically identified uses the DL / T 645 communication message to receive the "characteristic current signal sending instruction" message sent by the control terminal, and determines the sending time of the characteristic current signal and the characteristic code information, high-level pulse width, low-level pulse width and other formats of the characteristic current signal from the message, so as to generate the corresponding characteristic current signal according to the format and the sending time and send it.

[0101] Step S3: After detecting the characteristic current signal, the characteristic current signal recognition device in the distribution network reports the detection result of the characteristic current signal to the control terminal.

[0102] In this embodiment, after detecting the characteristic current signal, the characteristic current signal identification device located in the same distribution station area, i.e., the distribution network, first obtains the detection time of detecting the characteristic current signal, and reports the detection time to the control terminal using a DL / T 645 communication message consistent with the control terminal and the topology identification node.

[0103] Step S4: the control terminal sends an instruction message according to the detection result and the characteristic current signal to determine the topology identification result of the node to be topology identified.

[0104] In this embodiment, the control terminal compares the transmission time of the characteristic current signal of the node to be topologically identified, as determined in the characteristic current signal transmission instruction message, with the detection time reported by the characteristic current signal identification device to obtain the topological identification result of the node to be topologically identified, including whether it belongs to the current substation and, if so, which line branch it belongs to. Before the topology identification begins, the control terminal synchronizes time with all current detection modules within the distribution substation. After a node X sends a message of the characteristic current signal, the message transmission time is recorded. The signal arrival time is carried in the report message of the characteristic current signal detection module. If the time difference between the two is less than a preset value, the signal is considered to be sent by node X.

[0105] A topology identification method provided in this embodiment can improve the efficiency and accuracy of topology identification by injecting characteristic current signals. However, when performing topology identification, this topology identification method firstly causes a large time synchronization error between the three types of nodes: the substation control terminal device used to control the transmission of characteristic currents and perform topology identification, the characteristic current signal sending device used to send characteristic current signals, and the characteristic current signal identification device used to identify characteristic current signals. As a result, the substation control terminal device can only configure the sending time in the "characteristic current signal sending instruction" message to FF FF FF FF FFFF. That is, the sending device does not need to determine the time and immediately sends the characteristic current signal after receiving the message. When using this solution, to avoid misjudgment, the substation control terminal device is forced to configure a larger current signal sending interval for the two adjacent devices to be topology identified, resulting in a longer time to complete the entire substation topology identification. Currently, the average topology identification time for a device is generally as high as 30 to 40 seconds. Secondly, existing downlink messages for sending topology instructions and uplink messages for reporting topology identification results are transmitted within the electricity consumption information collection system via point-to-point DL / T 645 messages. These messages have a low priority, making them prone to high message delays or even message loss when the electricity consumption information collection system collects meter data at high frequencies. Furthermore, the design of the characteristic current signal detection algorithm is difficult: in the current technical system, the characteristic current signal detection device cannot know the transmission time of the characteristic current signal, so its receiver must always be in a blind detection state. This makes algorithm design challenging and makes it difficult to achieve a good balance between false alarm rate and false negative rate. Furthermore, in practical applications, there is not much space left for the characteristic current transmission module within a smart meter, and in some cases the transmission circuit must even be integrated onto the circuit boards of other units within the meter. During the characteristic current transmission period, a large amount of heat is generated, which can adversely affect the overall operation of the meter.

[0106] In order to solve the technical problems existing in the above topology identification method, refer to Figure 3 This embodiment discloses a topology identification method based on power carrier and characteristic current, so as to improve the recognition efficiency and recognition accuracy of the topology identification results of the nodes to be topologically identified by combining power carrier communication technology and characteristic current injection technology.

[0107] It should be noted that the power carrier communication technology is a communication technology that uses power lines to transmit signals. Its core mechanism includes the following: Figure 3 The figure shows a multi-level tree-shaped routing topology with a concentrator (CCO) as the center and a proxy coordinator (PCO) as the relay agent, connecting all slave stations (STAs), and a beacon system based on the tree-shaped routing mechanism. Specifically, the beacon system is that the CCO acts as the central control node for network operation, uses a superframe time slot structure based on the beacon period for network communication, and uses beacon signals to maintain the synchronization and orderly operation of the entire network. The time slot division of the network within a beacon period is as follows: Figure 4 As shown. Figure 4 As shown in the time slot division, in the single-mode power line broadband carrier communication standard, the beacon period cannot exceed 10 seconds; in the dual-mode power line broadband carrier + wireless communication standard, the beacon period cannot exceed 15 seconds. The bound CSMA slot area can only transmit messages of the type specified by the CCO (Note: If the length of the slot area is non-zero, the beacon signal will carry the type number corresponding to the specified message type). With the central beacon signal sent by the CCO as the source, a node receiving a beacon signal from another node, if it parses the signaling content and finds that it is one of the Y+Z sending nodes, and its assigned beacon slot has not yet arrived on the timeline, will relay a proxy beacon signal or a discovery beacon signal in the beacon slot when the time arrives. Based on this mechanism and the selection of appropriate proxy relay nodes, the central coordinator can use these X+Y+Z beacon slots to broadcast its beacon signaling information to the entire network within a beacon period. The three types of beacons in the beacon signal (central beacon, proxy beacon and discovery beacon) all use the same form as Figure 5 The signal structure shown.

[0108] from Figure 5It can be seen that the signal structure includes a preamble signal, a frame control signal, and a payload signal. The preamble signal is used for signal capture and synchronization, while the frame control signal uses a fixed modulation and coding scheme and a fixed physical block length of 16 bytes. In addition to some basic information including network name, network time information, etc., the signaling content in the frame control signal further indicates the physical layer format of the subsequent payload signal, thereby helping the receiving end to correctly receive and parse the content of the payload signal. In this embodiment, the definition of the payload field in the beacon signal in the power line broadband carrier communication standard is as follows:

[0109]

[0110]

[0111] Referring to the definition of the payload field shown in the above table, the definition of the beacon management message part is shown in the following table:

[0112]

[0113] The type definition and content description of the management messages shown in the above table are shown in the following table:

[0114]

[0115]

[0116] It should be noted that, referring to the power carrier communication technology described in the above technical solution, the concentrator is the name of the broadband carrier communication network, and its device name is the control terminal used for topology identification and sending characteristic current signal sending instructions in this embodiment.

[0117] Specifically, based on Figures 3 to 5 The power carrier communication technology shown in FIG. 1 is a process of a topology identification method based on power carrier and characteristic current provided in this embodiment. Figure 6 As shown, it mainly includes:

[0118] Step 601: Add a management message corresponding to the characteristic current signal sending instruction to the original beacon signal of the power line broadband carrier communication network, so that the control terminal broadcasts the characteristic current signal sending instruction to the characteristic current identification node and multiple nodes to be identified in the distribution network according to the management message.

[0119] In the existing technology, the control terminal uses the CSMA time slot of the power line broadband carrier communication network to send a message corresponding to the characteristic current signal sending instruction to the node to be identified. However, this message is a point-to-point unicast transmission message, and other non-destination nodes in the network cannot parse the content, which results in the characteristic current identification node being unable to obtain the sending time when the node to be identified sends the characteristic current signal in a timely manner.

[0120] In this embodiment, in order to solve the technical problem that the above-mentioned characteristic current identification node cannot obtain the sending time, a management message named "characteristic current signal sending instruction" is added to the beacon signal of the power line broadband carrier communication network, and the signal of the added management message can carry signaling information similar to the message corresponding to the original characteristic current signal sending instruction, and the characteristic current signal sending time is changed from the original perpetual calendar time to the power line broadband carrier communication network reference time (Network Time Base: NTB).

[0121] In this embodiment, the control terminal transmits signaling content by using a new beacon signal that incorporates the aforementioned management message. The control terminal uses the power line carrier network's time reference instead of the traditional perpetual calendar time. Specifically, the embedded carrier module of the node to be identified receives the "characteristic current signal transmission instruction" beacon management message within the beacon signal. It then extracts the associated transmission time (NTB), which is then measured by the carrier module's timing module. When the transmission time arrives, the carrier module sends a command to the characteristic current transmission module, instructing it to immediately transmit the characteristic current signal.

[0122] In this embodiment, the specific definition of the management message named 'characteristic current signal sending instruction' added to the signal is shown in the following table:

[0123]

[0124] From the specific definition table of the management message, it can be seen that the management message includes the instruction format corresponding to the characteristic current sending instruction and limits the number of nodes to be identified. The content definition of the newly added characteristic current sending instruction message in the management message in the above table is shown in the following table:

[0125]

[0126]

[0127] In this embodiment, referring to the above table, it can be seen that the characteristic current signal sending instruction includes the network communication address corresponding to each of the multiple nodes to be identified in sequence, the power line broadband carrier communication network reference time when the first of the multiple nodes to be identified in sequence sends the characteristic current signal, the characteristic code information corresponding to the characteristic current signal, and the characteristic current sending duration and other information.

[0128] In the power line broadband carrier communication network protocol, the control terminal assigns a 12-bit short network communication address to each node entering the network—each node to be identified and each characteristic current identification node—to uniquely identify the node within the network. The control terminal contains a high-performance 25MHz crystal oscillator, from which it generates a network time base (NTB) with a time granularity of 40ns and a signaling length of 5 bytes (40 bits). The control terminal carries this time data in the beacon signal of each beacon cycle, and the receiving node of the beacon signal corrects its own time data upon receiving the beacon signal. This time synchronization mechanism, with the CCO as the source, disseminates and corrects CCO time data through hop-by-hop relay transmission of the beacon signal, ensuring that the time mechanism of all nodes in the network maintains a high degree of synchronization accuracy, generally reaching the millisecond level. It should be noted that the length of the payload field of the beacon signal is fixed at 136 bytes or 520 bytes. Judging from the current application results, there is still a large amount of signaling space left, which is sufficient to mount the characteristic current sending instruction message corresponding to the management message in the payload field without changing the beacon signal channel overhead.

[0129] In this embodiment, since the beacon signal in the power line broadband carrier communication network is broadcast throughout the entire network, the control terminal can send a new beacon signal with a management message corresponding to the characteristic current signal sending instruction added to each node of the distribution network, that is, the node to be identified, the characteristic current signal identification node, etc. in the distribution network through the power line broadband carrier communication network.

[0130] Step 602: The plurality of nodes to be identified perform multi-phase parallel transmission of characteristic current signals according to the characteristic current signal transmission instruction.

[0131] In this embodiment, the low-voltage distribution substation adopts a three-phase four-wire system, that is, it contains three live wires A / B / C and one neutral wire, and the node to be identified, that is, the characteristic current signal sending module, is a single-phase power supply device, and can only inject characteristic current signals into the line where its power supply phase is located. In this embodiment, since the power line broadband carrier communication network has the node phase recognition capability, the control terminal can arrange the nodes to be identified located in three different phases to perform three-phase parallel transmission of characteristic current signals in a signal interleaving manner. Among them, the signal interleaving method is as follows: Figure 7 As shown. The current transmission process of the characteristic current transmission module in the node to be identified is essentially a control process of an electric control switch, that is, the switch can be programmed to control the duration of the closed state and the duration of the open state. The control terminal notifies the node to be identified to send a current signal of a specified format at a specified time, and the node to be identified sends the corresponding signal according to the instruction content after receiving the instruction. Figure 7It can be seen from the figure that the signal transmission time of the three nodes with different phases differs by 1 / 3 of a cycle time, so it is natural to realize the three-phase parallel transmission of the characteristic current signal.

[0132] It's important to note that in low-voltage distribution networks (50Hz power systems, with one cycle lasting 20ms), transmission lines generally use a three-phase, four-wire system, with three wires representing phases A, B, and C, and one representing the neutral line N. The generator's rotor consists of three sets of coils, each 120 degrees apart. Since the generator generates alternating current (AC), the three sets of coils produce AC currents with a phase difference of 120 degrees. Three-phase power supply connects these three currents as live wires to different electrical appliances, and then connects them to a common neutral wire. Existing power line broadband carrier communication standards require carrier communication modules (including control terminals) to detect voltage signal zero crossings. Therefore, the control terminal can instruct the carrier communication module to report the NTB time corresponding to each voltage zero crossing within a certain period of time, which can then be used to determine the corresponding line phase.

[0133] It should be noted that, in order to reduce the signaling length, the message field of the characteristic current sending instruction only gives the characteristic current signal sending time of the first node to be identified among several nodes to be identified in sequence. Here, the characteristic current signal sending time of the second node is assumed to be the sending time of the first node to be identified plus a preset time difference, such as 20 / 3ms. The characteristic current signal sending NTB time of the third node to be identified is the sending time of the second node to be identified plus a preset time difference. The controller will arrange the center point of the characteristic current segmented signal 1 of the first node to be identified to be just near the zero-crossing point of the voltage signal of its phase. Based on this, it can also ensure that all the characteristic current segmented signals of the three nodes are just near the zero-crossing point of the voltage signal of its phase (at this time, the AC voltage amplitude value on the line is small and the noise level is low).

[0134] It should be noted that if the number of nodes to be identified is only 2 or 1, the communication short address value is set to all zeros (communication standards stipulate that the short address value of the concentrator is 1, and the short address value range of other nodes is 2-4094).

[0135] Step 603: The characteristic current identification node sends an instruction to perform multi-phase current sampling according to the characteristic current signal to obtain a multi-phase current signal.

[0136] In this embodiment, since the control terminal uses a beacon signal to transmit the characteristic current signal sending instruction, the characteristic current identification node can clearly know the signal sending start time of the node to be identified. Then, the current sampling state of the characteristic current identification node is initially in the closed state until it receives the characteristic current signal sending instruction management message carried by the beacon signal, and then the current sampling state is converted to the open state. According to the opening of the current sampling state, the characteristic current identification node starts sampling the multi-phase line current signal at the corresponding time based on the characteristic current sending time data in the management message. Among them, the sampling duration of the characteristic current identification node is determined according to the characteristic current signal sending duration in the characteristic current signal sending instruction and the number of nodes to be identified. For example, when the characteristic current signal sending duration is 9.6 seconds and the number of nodes to be identified is 3, the sampling duration is 9.6×3=28.8 seconds.

[0137] Based on the segmented and staggered transmission of characteristic current signals by different nodes to be identified in a signal interleaving manner, the characteristic current identification node discards the sampling signals of the non-characteristic current segmented signal time period accounting for 2 / 3 of each phase, thereby generating sampling signals with three time segments of 9.6 seconds in length.

[0138] It should be noted that the power supply line of a substation is generally only a few hundred meters long, and the characteristic current signal is transmitted at the speed of light. Therefore, the current signal transmission delay between the node to be topologically identified and the characteristic current signal identification device can be ignored.

[0139] Step 604: The characteristic current identification node detects the characteristic current signal of each phase of the current signal to obtain the signal detection time of the current signal of each phase according to the detection result.

[0140] In this embodiment, the characteristic current identification node determines whether the current signal of each phase contains a characteristic current signal with a characteristic code. If it is determined to contain a characteristic current signal, the signal detection time of the current signal is obtained and reported to the control terminal.

[0141] Step 605: The control terminal sends an instruction to obtain a topology identification result of each of the nodes to be identified according to the signal detection time and the characteristic current signal.

[0142] In this embodiment, the control terminal obtains the sending time of the characteristic current signal of each node to be identified according to the characteristic current signal sending instruction, and then matches the sending time corresponding to the current signal to obtain the time difference between the sending time and the signal detection time, so as to obtain the topology identification result of the node to be identified based on the time difference.

[0143] It should be noted that after reporting to the control terminal, the characteristic current identification node turns off the current sampling state until it receives the 'characteristic current signal sending instruction' management message carried by the beacon signal again.

[0144] This embodiment discloses a topology identification method based on power line carrier and characteristic current. First, it reuses the existing power line broadband carrier communication standard's beacon signaling full network broadcast system. It can carry characteristic current transmission instruction messages without increasing the channel overhead of the existing beacon signal. That is, it no longer needs to use the existing point-to-point DL / T 645 message for point-to-point instruction transmission; it also further improves the transmission reliability of instruction messages. Secondly, it reuses the existing power line broadband carrier communication standard's time synchronization system and beacon signaling full network broadcast system. This allows the characteristic current signal identification device to clearly know the start and end positions of the signal transmission time of the sending device. Therefore, the design principle of the characteristic current detection algorithm will change from the existing more complex characteristic current signal detection method using a sliding window to a relatively simple binary decision problem of whether the current signal in a specific time period contains a characteristic current signal. This will undoubtedly greatly improve the accuracy of the detection results. Furthermore, leveraging the time synchronization system and node phase awareness capabilities of the Power Line Broadband Carrier Communication standard, a design was developed to stagger the transmission of characteristic current signals from three nodes with different phases. While maintaining the same topology identification efficiency, the characteristic current signal transmission energy remains the same for a single node, but the signal transmission time is extended from 9.6 seconds to 28.8 seconds. This facilitates heat dissipation of the characteristic current signal. Furthermore, for a single node, the corresponding characteristic current signal segments are all located near the zero crossing point, resulting in a smaller line current amplitude and reduced background noise intensity. This improves the signal-to-noise ratio of the received signal and enhances the characteristic current signal detection performance. Furthermore, utilizing the time synchronization system of the Power Line Broadband Carrier Communication standard significantly reduces the time interval between current signal transmissions between two adjacent devices. Compared to existing solutions, the average topology identification time for a single node can be reduced from 30-40 seconds to approximately 10 seconds.

[0145] The specific embodiments described above further illustrate the objectives, technical solutions, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of protection of the present invention for those skilled in the art.

Claims

1. A topology identification method based on power carrier and characteristic current, characterized in that: include: Broadcasting a characteristic current signal sending instruction to a characteristic current identification node and multiple nodes to be identified in the distribution network through a power line broadband carrier communication network; Injecting a characteristic current signal into the power supply line where each of the nodes to be identified is located in parallel according to the characteristic current signal sending instruction and the multiple nodes to be identified; Performing current sampling on multiple power supply lines according to the characteristic current signal sending instruction and the characteristic current identification node to obtain multi-phase current signals; Performing detection of the characteristic current signal on the current signal of each phase, and obtaining the detection time of the current signal of each phase according to the detection result; A topological relationship between each of the nodes to be identified and the power distribution network is obtained according to the detection time and the characteristic current signal sending instruction.

2. A topology identification method based on power carrier and characteristic current according to claim 1, characterized in that: The method of broadcasting the characteristic current signal sending instruction to the characteristic current identification node and multiple nodes to be identified in the power distribution network through the power line broadband carrier communication network includes: Obtain an original beacon signal of the power line broadband carrier communication network, and add a management message corresponding to a characteristic current signal sending instruction to the original beacon signal to obtain a new beacon signal; wherein the management message is mounted in a payload field of the new beacon signal; the characteristic current signal sending instruction includes a network communication address corresponding to each of a plurality of nodes to be identified in sequence, a power line broadband carrier communication network reference time when the first of the plurality of nodes to be identified in sequence sends a characteristic current signal, characteristic code information corresponding to the characteristic current signal, and a characteristic current sending duration; The new beacon signal is broadcast to each node in the power distribution network through the power line broadband carrier communication network; wherein the nodes include the characteristic current identification node and each of the nodes to be identified.

3. A topology identification method based on power carrier and characteristic current according to claim 2, characterized in that: The sending of the instruction and the plurality of nodes to be identified according to the characteristic current signal, and injecting the characteristic current signal into the power supply line where each of the nodes to be identified is located in parallel, comprises: Broadcasting the characteristic current signal sending instruction to a plurality of nodes to be identified on power supply lines of different phases according to the power line broadband carrier communication network; Determine the time for each of the nodes to be identified to inject a characteristic current signal into the power supply line where it is located according to the power line broadband carrier communication network reference time and a preset time difference; According to the sending time and the multiple nodes to be identified, the characteristic current signal is injected into the multiple power supply lines in parallel through signal interleaving.

4. A topology identification method based on power carrier and characteristic current according to claim 3, characterized in that: The sending instruction according to the characteristic current signal and the characteristic current identification node sampling currents of multiple power supply lines where the characteristic current identification node is located to obtain a multi-phase current signal includes: When it is detected that the beacon signal received by the characteristic current identification node is the new beacon signal, converting the current sampling state of the characteristic current identification node to an on state; Determining a sampling time of the characteristic current identification node according to a power line broadband carrier communication network reference time in the characteristic current signal sending instruction; Determining a sampling duration of the characteristic current identification node according to the characteristic current sending duration in the characteristic current signal sending instruction and the total number of the network communication addresses; According to the sampling time and the sampling duration, currents of the power supply lines of different phases are sampled respectively through the characteristic current identification node to obtain multi-phase current signals.

5. A topology identification method based on power carrier and characteristic current according to claim 4, characterized in that: The sending instruction according to the characteristic current signal and the characteristic current identification node sampling currents of multiple power supply lines where the characteristic current identification node is located to obtain a multi-phase current signal further includes: According to the signal interleaving transmission method of multiple characteristic current signals, the sampling signals of the non-characteristic current segmented signal time period in the current signal of each phase are discarded to obtain the current signals after the sampling signals are discarded in multiple phases; wherein, the duration of the current signal after the sampling signals are discarded in each phase is consistent with the characteristic current transmission duration.

6. A topology identification method based on power carrier and characteristic current according to claim 2, characterized in that: The detecting the characteristic current signal of each phase current signal and obtaining the detection time of each phase current signal according to the detection result includes: Detecting the characteristic code information on the current signal of each phase; For the current signal of any phase; When it is detected that the current signal of the phase has the characteristic code information, the signal detection time of the current signal of the phase by the characteristic current identification node is obtained.

7. A topology identification method based on power carrier and characteristic current according to claim 6, characterized in that: The acquiring of a topological relationship between each of the nodes to be identified and the distribution network according to the detection time and the characteristic current signal sending instruction includes: The signal detection time corresponding to the current signal of any phase; A time difference between the signal detection time and the sending time of the node to be identified corresponding to the current signal of the phase is obtained, so as to determine a topological relationship between the node to be identified and the power distribution network according to the time difference.

8. A topology identification system based on power carrier and characteristic current, characterized in that: It includes a signal broadcast module, a characteristic current injection module, a current sampling module, a characteristic current detection module and a topology identification module; The signal broadcast module is used to broadcast the characteristic current signal sending instruction to the characteristic current identification node and multiple nodes to be identified in the power distribution network through the power line broadband carrier communication network; The characteristic current injection module is used to send instructions and multiple nodes to be identified according to the characteristic current signal, and inject characteristic current signals into the power supply line where each node to be identified is located in parallel; The current sampling module is used to perform current sampling on multiple power supply lines according to the characteristic current signal sending instruction and the characteristic current identification node to obtain multi-phase current signals; The characteristic current detection module is used to detect the characteristic current signal of each phase of the current signal, and obtain the detection time of the current signal of each phase according to the detection result; The topology identification module is used to obtain the topological relationship between each of the nodes to be identified and the power distribution network according to the detection time and the characteristic current signal sending instruction.

9. A terminal device, characterized in that: The method comprises a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, the method implements a topology identification method based on power carrier and characteristic current according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that include: A stored computer program, wherein when the computer program is run, the device where the computer-readable storage medium is located is controlled to execute a topology identification method based on power carrier and characteristic current according to any one of claims 1 to 7.

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