A power distribution network topology identification method, system, device and storage medium

Abstract

The application discloses a power distribution network topology identification method, system, device and storage medium, wherein the method comprises the following steps: obtaining first event sequence information of a first power distribution device and second power-on time sequence of a second power distribution device; the first event sequence information comprises a first power-on time sequence and a first power-on time sequence; according to the first event sequence information and the second power-on time sequence, a first identification result of a power distribution device level is obtained; obtaining current flow mutation values of all power distribution devices; according to the current flow mutation values, a second identification result of a power supply path of the power distribution device is obtained; and according to the first identification result and the second identification result, the power distribution network topology is identified. According to the event sequence information of two power distribution devices, the level of the two power distribution devices in the power grid topology can be determined, and according to the current flow mutation value of the power distribution device, the power supply path can be determined, so that the accuracy of the power distribution network topology identification can be improved. The application can be widely applied in the technical field of power distribution networks.

Description

Technical Field

[0001] This application relates to the field of power distribution network technology, and in particular to a power distribution network topology identification method, system, device and storage medium. Background Technology

[0002] Currently, distribution network topology identification mainly includes two parts: medium-voltage distribution network topology identification and low-voltage distribution network topology identification.

[0003] Medium-voltage distribution network topology identification methods can be mainly divided into two categories: The first category is based on power flow analysis and state estimation. This type of method basically identifies the correctness of the existing topology by combining real-time measurement data of the distribution network. Due to the limited number of detection devices installed in the distribution network, there is insufficient real-time measurement, making it difficult to correctly identify the topology. The second category of topology identification methods adopts a data-driven approach and does not rely on prior knowledge of the system structure. However, these methods mostly require several hours or even several days of time-series measurement data, resulting in low efficiency in topology identification. Moreover, if the topology changes during the sampling period, the algorithm performance cannot be guaranteed.

[0004] Low-voltage distribution network topology identification is currently mainly divided into four categories: (1) Data-driven topology identification method, such as using the electricity consumption information of users in the distribution area, using voltage data similarity or correlation analysis methods to automatically analyze the connection relationship between the power supply and the electrical equipment in the distribution area; using current relationship to identify incoming lines, branch lines, etc. This type of method requires several hours or even several days of time-series measurement data, and the topology changes during the sampling period, otherwise the correctness of the topology cannot be guaranteed. (2) Current injection method. On the low-voltage distribution line (or bus), a small current signal is injected into the power frequency signal, and the current signal is captured layer by layer to achieve topology identification. Although this type of method realizes the automatic identification of the low-voltage distribution area topology, it requires the injection of instantaneous pulse current into the power grid, which increases the power source, seriously affects the safe operation of the power grid, and the investment cost is high, which is not conducive to the implementation of the project. (3) Power outage and restoration analysis method. By orderly power outages and restorations of the main branches of low-voltage distribution areas, the gateway reads the power outage and restoration data of users and compares it with the power outage and restoration information of the main branches, a low-cost automatic identification scheme for the "household-line-transformer" topology is realized. This method requires power outages for users and is generally used during maintenance. It cannot reflect topology changes in real time. (4) Mobile APP along the layout method. Through the application of mobile APP, the entire process of "establishing ledgers, associating topology, configuring terminals, and point map operation" of low-voltage modeling business is completed. After authorization, the power supply station personnel carry out relevant business through the low-voltage APP. This method relies on manual topology input, which is prone to errors. Therefore, a new distribution network topology identification method is urgently needed. Summary of the Invention

[0005] The purpose of this application is to at least partially solve one of the technical problems existing in the prior art.

[0006] Therefore, one objective of the embodiments of this application is to provide a distribution network topology identification method, system, device and storage medium, which can improve the accuracy of distribution network identification.

[0007] To achieve the above-mentioned technical objectives, the technical solutions adopted in the embodiments of this application include:

[0008] A method for identifying a power distribution network topology includes the following steps: acquiring first event sequence information of a first power distribution device and a second power-receiving time sequence of a second power distribution device; the first event sequence information includes a first power-sending time sequence and a first power-receiving time sequence; obtaining a first identification result of the power distribution device hierarchy based on the first event sequence information and the second power-receiving time sequence; acquiring current fluctuation values ​​of all power distribution devices; obtaining a second identification result of the power supply path of the power distribution devices based on the current fluctuation values; and identifying the power distribution network topology based on the first identification result and the second identification result.

[0009] In addition, the method for identifying a distribution network topology according to the above embodiments of the present invention may also have the following additional technical features:

[0010] Furthermore, in this embodiment of the application, the step of obtaining the first identification result of the power distribution equipment level based on the first event sequence information and the second power-on time sequence specifically includes: if the first power-on time sequence is the same as the second power-on time sequence, then the first power distribution equipment and the second power distribution equipment are power distribution equipment at the next lower level; if the first power-on time sequence is the same as the second power-on time sequence, then the first power distribution equipment and the second power distribution equipment are power distribution equipment at the same level.

[0011] Furthermore, in this embodiment of the application, the step of obtaining the second identification result of the power supply path of the power distribution equipment based on the current mutation value specifically includes: obtaining the current mutation value of all power distribution equipment; identifying power distribution equipment with the same current mutation value as power distribution equipment of the same power supply path.

[0012] Furthermore, in this embodiment of the application, it also includes identifying a first section of the distribution network and a tie switch for identifying the distribution network.

[0013] Furthermore, in this embodiment of the application, the step of identifying the first section of the distribution network specifically includes: obtaining the third energization time sequence of the first switch, the first self-description information of the first switch, and the third energization time sequence of the outgoing circuit breaker; if the third energization time sequence is the same as the third energization time sequence, and the first self-description information is the same as the preset self-description information, then the identification result is that the first section is correctly connected.

[0014] Furthermore, in this embodiment of the application, obtaining the first self-describing information includes: obtaining the device power information of the first switch or obtaining the power distribution line information to which the device of the first switch belongs.

[0015] Furthermore, in this embodiment of the application, the step of identifying the tie switch of the distribution network specifically includes: obtaining the fourth power-on time sequence and tie mode signal of the second switch; if the power-on time sequence is the same as the tie mode signal, the second switch is a tie switch.

[0016] On the other hand, embodiments of this application also provide a distribution network topology identification system, including:

[0017] The first acquisition unit is used to acquire first event sequence information of the first power distribution equipment and second event sequence information of the second power distribution equipment.

[0018] The first processing unit is configured to obtain a first identification result of the power distribution equipment level based on the first event sequence information and the second event sequence information.

[0019] The second acquisition unit is used to acquire the current fluctuation values ​​of all power distribution equipment;

[0020] The second processing unit is used to obtain a second identification result of the power supply path of the power distribution equipment based on the current change value;

[0021] The third processing unit is used to identify the power distribution network topology based on the first identification result and the second identification result.

[0022] On the other hand, this application also provides a distribution network topology identification device, comprising:

[0023] At least one processor;

[0024] At least one memory for storing at least one program;

[0025] When the at least one program is executed by the at least one processor, the at least one processor implements a power distribution network topology identification method as described in any one of the inventions.

[0026] In addition, this application also provides a storage medium storing processor-executable instructions, which, when executed by a processor, are used to perform a power distribution network topology identification method as described in any of the preceding claims.

[0027] The advantages and beneficial effects of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application:

[0028] This application can determine the hierarchical relationship between two power distribution devices in the power grid topology based on the event sequence information of the two power distribution devices, and can determine the power supply path of the power distribution devices in the topology based on the sudden change value of the current flowing through the power distribution devices. By identifying the topology of the power distribution network through the hierarchical relationship of the power distribution devices and the power supply path, the accuracy of power distribution network topology identification can be improved. Attached Figure Description

[0029] Figure 1 This is a schematic diagram illustrating the steps of a power distribution network topology identification method in a specific embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the steps in a specific embodiment of the present invention to obtain the first identification result of the power distribution equipment level based on the first event sequence information and the second power-on time.

[0031] Figure 3 This is a schematic diagram of a power distribution network topology identification system in a specific embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the structure of a power distribution network topology identification device in a specific embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of a power distribution network topology in a specific embodiment of the present invention. Detailed Implementation

[0034] The following detailed description, in conjunction with the accompanying drawings, illustrates the principles and processes of the power distribution network topology identification method, system, device, and storage medium in the embodiments of the present invention.

[0035] First, the terms used in this application specification will be explained:

[0036] SOE (Sequence of Event) is a record of events in sequence. When a power device undergoes a remote signaling change, such as a switch change, the power protection device or smart power meter will automatically record the change time, the cause of the change, and the corresponding telemetry values ​​(such as the corresponding three-phase current, active power, etc.) when the switch trips, forming an SOE record.

[0037] FCB (Feeder Current Breaker)

[0038] EMS (Energy Management System)

[0039] Reference Figure 1 The present invention provides a method for identifying the topology of a power distribution network, comprising the following steps:

[0040] S1. Obtain first event sequence information of the first power distribution equipment and second event sequence information of the second power distribution equipment; the first event sequence information includes a first power supply time sequence and a first power receiving time sequence; the second event sequence information includes a second power supply time sequence and a second power receiving time sequence.

[0041] In this embodiment, the first power distribution device can be any power distribution device in the power distribution network topology. Each power distribution device may receive or transmit power. Therefore, the first event sequence information may include a first power transmission time sequence and a first power receiving time sequence. The first power transmission time sequence refers to the time sequence corresponding to when the first power distribution device receives power, and the first power receiving time sequence refers to the time sequence corresponding to when the first power distribution device receives power. The second power distribution device can be any other power distribution device in the power distribution network topology. The second power receiving time sequence is the time when the second power distribution device receives power. The first event sequence information and the second power receiving time are collected by the power distribution terminal and uploaded to the power distribution host. Specifically, refer to... Figure 5 ,exist Figure 5 In this context, the first power distribution device can be any device in the entire power distribution network, such as power distribution device 11 or power distribution device 12, while the second power distribution device can also be any numbered power distribution device.

[0042] S2. Based on the first event sequence information and the second power-on time sequence, obtain the first identification result of the power distribution equipment level;

[0043] In this embodiment of the application, the first identification result may include whether the first power distribution device and the second power distribution device are at the same level, or whether the first power distribution device and the second power distribution device are at different levels. It should be noted that there are multiple power distribution devices in the entire topology. In addition to the first device and the second device, the hierarchical relationship between other devices can also be determined by the power receiving time and power supply time. After determining the level of the first device and the second device, as well as the level of other power distribution devices, the topology level of the entire power distribution network can also be identified.

[0044] S3. Obtain the sudden change value of current in all power distribution equipment;

[0045] In this embodiment of the application, since the power distribution network topology has multiple power distribution devices, when a power distribution device supplies power to a load, the current of the power distribution devices on the same power supply path will change. Based on this principle, when a power distribution device supplies power to a load, the power distribution host can simultaneously obtain the current change value of the corresponding power distribution device through which all power distribution terminals in the entire power distribution network flow. The power supply path to which the power distribution device belongs can be determined based on the current change value.

[0046] S4. Based on the current change value, obtain the second identification result of the power supply path of the power distribution equipment;

[0047] In this embodiment, the second identification result may include whether the power distribution equipment belongs to the same power supply path or not. A power distribution network topology may contain multiple power distribution devices under load. Since the power supply current of power distribution devices on the same path changes when a power distribution device is under load, the power distribution terminal can collect the current fluctuation values ​​flowing through all power distribution devices in the power distribution network topology, and determine several power distribution devices belonging to the same path based on the different current fluctuation values.

[0048] S5. Identify the power distribution network topology based on the first identification result and the second identification result.

[0049] In this embodiment of the application, the first identification result can obtain the hierarchical relationship of the power distribution equipment in the topology, and the second identification result can determine the different power supply path of each power distribution equipment among multiple load-bearing power distribution equipment. After determining the power supply path of the power distribution terminal and the terminal level of the power distribution equipment, the topology of the entire power distribution network can be determined.

[0050] Furthermore, referring to Figure 2 The step of obtaining the first identification result of the power distribution equipment level based on the first event sequence information and the second power-on time may specifically include:

[0051] S21. If the first power supply time sequence is the same as the second power receiving time sequence, then the first power distribution equipment and the second power distribution equipment are power distribution equipment at the next level.

[0052] S22. If the first power-on time sequence is the same as the second power-on time sequence, then the first power distribution equipment and the second power distribution equipment are power distribution equipment at the same level.

[0053] Specifically, considering that electricity travels at the speed of light, within a set error range, it can be assumed that when a higher-level power distribution device actually supplies power, its power supply time is equal to the power receiving time of a lower-level power distribution device. If the power receiving time sequence of the first power distribution device is the same as that of the second power distribution device, then the first and second power distribution devices can be determined to be devices of the same level. If the power receiving time of the second power distribution device is the same as the power supply event of the first power distribution device, then the second device is a device of an adjacent level to the first device and a device of the next level below the first device. Specifically, refer to... Figure 5 If the first power distribution device is device 102 of the ring main unit, and the power supply time sequence and power receiving time sequence of device 102 are detected, if the power receiving time sequence of the second device is the same as the power supply time of 102, then the second device is device 21; if the power receiving time sequence of device 102 is detected to be equal to the power receiving time sequence of the second power distribution device, then the second device can be determined to be one of device 101, device 103, device 104 and device 12. In addition, since there are multiple distribution devices in the distribution network, the above method with adaptive adjustments can also be used when confirming the hierarchical relationship of other devices.

[0054] Furthermore, the step of obtaining the second identification result of the power supply path of the power distribution equipment based on the sudden change value of the current specifically includes:

[0055] S41. Obtain the sudden change value of the current flowing through all power distribution equipment;

[0056] S42. Identify the power distribution equipment with the same current change value as power distribution equipment with the same power supply path.

[0057] In this embodiment, the power distribution host can obtain the current fluctuation values ​​of all power distribution equipment through the power distribution terminal. Among all power distribution equipment, those with the same current fluctuation values ​​are identified as power distribution equipment on the same path. Specifically, refer to... Figure 5 ,exist Figure 5 In this scenario, if power distribution equipment 202 experiences a current change due to a load, the power distribution equipment along its path will also experience the same change. That is, power distribution equipment 21, power distribution equipment 102, and power distribution equipment 11 will all experience the same current change. Therefore, based on the same current change, power distribution equipment 202, power distribution equipment 21, power distribution equipment 102, and power distribution equipment 11 can be identified as equipment on the same path. It is worth noting that if other equipment in the power distribution network topology experiences a current change due to a load, this method can also be used to identify other power distribution equipment belonging to the same power supply path.

[0058] Furthermore, in some embodiments of this application, the steps may also be included: identifying a first section of the distribution network and identifying a tie switch of the distribution network.

[0059] In this embodiment of the application, the first interval refers to the first interval between the substation FCB (Feeder Current Breaker) and the first sectionalizing switch of the entire distribution network; refer to Figure 5 The first interval refers to the interval between FCB and SW1. The SOE (State of Energy) transmitted by FCB is generally forwarded to the distribution master station via EMS (Energy Management System). The distribution master station is responsible for collecting either the received or transmitted SOE. Because the distribution master station and EMS use different time synchronization mechanisms, there may be errors in the SOE timescales, leading to misjudgment of the first interval's topology. Therefore, the distribution master station can match the received FCB power transmission event with the power-on time of the first sectionalizing switch, and simultaneously verify the connection relationship between FCB and SW1 using the self-describing information sent by sectionalizing switch SW1 to ensure the correctness of the first interval's topology connection. The tie switch is a switch installed in the tie cabinet that serves a tie function. The identification of the tie switch can be determined based on the received SOE and the transmitted tie mode remote signaling signal sent by the distribution terminal.

[0060] Furthermore, the step of identifying the first section of the distribution network may include:

[0061] Obtain the third energization time sequence of the first sectionalizing switch, the first self-describing information of the first sectionalizing switch, and the third energization time sequence of the outgoing circuit breaker;

[0062] If the third power-on time sequence is the same as the third power-off time sequence, and the first self-description information is the same as the preset self-description information, then the identification result is that the first interval is correctly connected.

[0063] In this embodiment, the third energizing time refers to the energizing time of the first sectionalizing switch, and the third energizing time refers to the energizing time sequence corresponding to the energizing event of the FCB. The first section can be correctly connected by verifying the energizing time sequence of the first sectionalizing switch sent by the distribution terminal and the energizing SOE forwarded by the energy management system, combined with the verification of the self-description information of the first sectionalizing switch and the preset self-description information of the distribution master station. Specifically, if the energizing time sequence of the first sectionalizing switch is the same as the energizing time sequence of the energizing SOE of the FCB, the electrical connection of the first sectionalizing switch is correct. If the first self-description information is the same as the preset self-description information of the first sectionalizing switch, such as the power supply information of the equipment corresponding to the first sectionalizing switch or the information of the distribution line to which the equipment belongs is the same as the preset self-description information of the sectionalizing switch, the connection of the first section is correct.

[0064] Furthermore, the step of identifying the interconnecting switches in the distribution network may include:

[0065] Obtain the fourth power-on time sequence of the second switch and the transmission time of the handover mode signal;

[0066] If the power-on time sequence is the same as the transmission time of the handshake mode signal, the second switch is a handshake switch;

[0067] Specifically, refer to Figure 5 ,exist Figure 5 In the process, after the first section switch SW1 is energized, the tie switch LSW1 can detect the energization. The distribution terminal corresponding to the tie switch LSW1 can send the energized SOE to the distribution master station. At the same time, the tie switch LSW1 sends the remote signaling signal of the tie mode. The distribution master station can determine that LSW1 is the tie switch based on the time sequence in the energized SOE and the transmission time of the remote signaling signal.

[0068] In addition, refer to Figure 3 ,and Figure 3 Corresponding to the method described above, embodiments of this application also provide a power distribution network topology identification system, comprising: a first acquisition unit 1101, configured to acquire first event sequence information of a first power distribution device and second event sequence information of a second power distribution device; a first processing unit 1102, configured to obtain a first identification result of the power distribution device level based on the first event sequence information and the second event sequence information; a second acquisition unit 1103, configured to acquire current mutation values ​​of all power distribution devices; a second processing unit 1104, configured to obtain a second identification result of the power supply path of the power distribution device based on the current mutation values; and a third processing unit 1105, configured to identify the power distribution network topology based on the first identification result and the second identification result.

[0069] and Figure 1 Corresponding to the method described herein, embodiments of this application also provide a distribution network topology identification device, the specific structure of which can be referred to Figure 4 ,include:

[0070] At least one processor 1011;

[0071] At least one memory 1012 is used to store at least one program;

[0072] When the at least one program is executed by the at least one processor, the at least one processor implements the power distribution network topology identification method.

[0073] The content of the above method embodiments is applicable to the device embodiments. The specific functions implemented by the device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0074] and Figure 1 Corresponding to the method described above, this application also provides a storage medium storing processor-executable instructions, which, when executed by a processor, are used to perform the power distribution network topology identification method.

[0075] In some alternative embodiments, the functions / operations mentioned in the block diagrams may not occur in the order shown in the operation diagrams. For example, depending on the functions / operations involved, two consecutively shown blocks may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order. Furthermore, the embodiments presented and described in the flowcharts of this application are provided by way of example to provide a more comprehensive understanding of the technology. The disclosed methods are not limited to the operations and logic flows presented herein. Alternative embodiments are contemplated in which the order of various operations is changed and sub-operations described as part of a larger operation are executed independently.

[0076] Furthermore, although this application is described in the context of functional modules, it should be understood that, unless otherwise stated to the contrary, one or more of the functions and / or features may be integrated into a single physical device and / or software module, or one or more functions and / or features may be implemented in a separate physical device or software module. It is also understood that a detailed discussion of the actual implementation of each module is unnecessary for understanding this application. Rather, given the properties, functions, and internal relationships of the various functional modules in the apparatus disclosed herein, the actual implementation of the module will be understood within the scope of conventional technology for an engineer. Therefore, those skilled in the art can implement the application set forth in the claims using ordinary techniques without excessive experimentation. It is also understood that the specific concepts disclosed are merely illustrative and not intended to limit the scope of this application, which is determined by the full scope of the appended claims and their equivalents.

[0077] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several programs to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0078] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequential list of executable programs for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, a program execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can retrieve and execute a program from or in conjunction with such a program execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can mean any means that can contain, store, communicate, propagate, or transmit a program for use by or in conjunction with a program execution system, apparatus, or device.

[0079] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0080] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable program execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0081] In the foregoing description of this specification, the references to terms such as "one embodiment," "another embodiment," or "some embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

[0083] The above is a detailed description of the preferred embodiments of this application, but this application is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A power distribution network topology identification method, characterized by, The method comprises the following steps: obtaining first event sequence information of a first power distribution device and second power-on time sequence of a second power distribution device; the first event sequence information comprises first power-on time sequence and first power-on time sequence; obtaining first identification result of power distribution device level according to the first event sequence information and the second power-on time sequence; obtaining current flow mutation value of all power distribution devices; obtaining second identification result of power distribution device power supply path according to the current flow mutation value; identifying power distribution network topology and first interval of the power distribution network according to the first identification result and the second identification result, wherein the first interval refers to an interval between a transformer substation outgoing line circuit breaker and a first sectionalizing switch of the entire power distribution network; the step of identifying the first interval of the power distribution network specifically comprises: obtaining third power-on time sequence of the first switch, first self-description information of the first switch and third power-on time sequence of the outgoing line circuit breaker, wherein the first self-description information comprises obtaining device power supply information of the first switch or obtaining device belonging to power distribution line information of the first switch; if the third power-on time sequence is the same as the third power-on time sequence and the first self-description information is the same as the preset self-description information, the identification result is that the first interval is correctly connected.

2. The power distribution network topology identification method of claim 1, wherein, the step of obtaining the first identification result of the power distribution device level according to the first event sequence information and the second power-on time sequence specifically comprises: if the first power-on time sequence is the same as the second power-on time sequence, the first power distribution device and the second power distribution device are power distribution devices of the next level; if the first power-on time sequence is the same as the second power-on time sequence, the first power distribution device and the second power distribution device are power distribution devices of the same level.

3. The method of claim 1, wherein, the step of obtaining the second identification result of the power distribution device power supply path according to the current flow mutation value specifically comprises: obtaining current flow mutation value of all power distribution devices; identifying the power distribution devices with the same current flow mutation value as power distribution devices of the same power supply path.

4. The power distribution network topology identification method of claim 1, wherein, It also comprises identifying a tie switch of the power distribution network.

5. The power distribution network topology identification method of claim 4, wherein, the step of identifying the tie switch of the power distribution network specifically comprises: obtaining fourth power-on time sequence of the second switch and tie mode signal; if the power-on time sequence is the same as the sending time of the tie mode signal, the second switch is a tie switch.

6. A power distribution network topology identification system characterized by, It comprises: a first acquisition unit for obtaining first event sequence information of a first power distribution device and second power-on time sequence of a second power distribution device; a first processing unit for obtaining first identification result of power distribution device level according to the first event sequence information and the second power-on time sequence; a second acquisition unit for obtaining current flow mutation value of all power distribution devices; a second processing unit for obtaining second identification result of power distribution device power supply path according to the current flow mutation value; a third processing unit for identifying power distribution network topology and first interval of the power distribution network according to the first identification result and the second identification result, wherein the first interval refers to an interval between a transformer substation outgoing line circuit breaker and a first sectionalizing switch of the entire power distribution network; The step of identifying the first section of the power distribution network specifically comprises: obtaining a third power-on time sequence of the first switch, first self-description information of the first switch, and a third power-on time sequence of the outgoing circuit breaker, wherein the first self-description information comprises device power supply information of the first switch or device belonging to the power distribution line information of the first switch; if the third power-on time sequence is the same as the third power-on time sequence, and the first self-description information is the same as the preset self-description information, the identification result is that the first section is correctly connected.

7. A power distribution network topology identification apparatus characterized by comprise: at least one processor; at least one memory for storing at least one program; when the at least one program is executed by the at least one processor, the at least one processor implements the power distribution network topology identification method according to any one of claims 1-5.

8. A storage medium having stored therein instructions executable by a processor, the instructions causing the processor to perform the method of claim 1. The instructions executable by the processor, when executed by the processor, are used to perform the power distribution network topology identification method according to any one of claims 1-5.

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