A Node Intelligent Connection Method and System Based on Self-Description and Interoperability of Distribution Network Equipment

Abstract

The present invention relates to a node intelligent connection method based on self-description and interoperability of distribution network equipment, including: after connecting predetermined medium and low voltage equipment to the distribution network, constructing a network topology and detecting whether the communication signals of the predetermined medium and low voltage equipment are distorted during transmission. If there is no distortion, establish a connection through a handshake protocol; determine whether the link delay of the communication signals of the predetermined medium and low voltage equipment during transmission meets the real-time requirement. If it meets, send a network node status information table to the target medium and low voltage equipment node; send the business card files of the second remaining medium and low voltage equipment nodes to the target medium and low voltage equipment node; the distribution network master station registers the business card files of the second remaining medium and low voltage equipment nodes and updates its network status information table; the target medium and low voltage equipment node interacts and collaborates with the second remaining medium and low voltage equipment nodes; if newly added predetermined medium and low voltage equipment continues to be connected to the distribution network, repeat the foregoing steps.

Description

Technical Field

[0001] The present invention relates to the technical field of smart grids, and more particularly to a node intelligent connection method and system based on self-description and interoperability of distribution network devices. Background Art

[0002] With the continuous advancement of the construction of smart grids, according to the development needs of smart grid construction and the operating characteristics of distribution networks, a new type of power network form - distribution Internet of Things (IoT) has emerged by integrating traditional distribution network technologies with IoT technologies. Compared with traditional IoT, the new distribution IoT emphasizes "collaboration". There are many ways to define and classify collaboration for the distribution IoT: from the perspective of the objects participating in collaboration, collaboration includes the interoperability between low-voltage devices in the distribution IoT, and the collaboration between low-voltage devices and the computing cloud; in terms of the way to achieve collaboration, collaboration includes the consistent interactivity of operation instructions, the coordination and management of data storage, the allocation and scheduling of computing tasks, and the reuse and allocation of communication bandwidth resources and power; at the level of completing collaboration, collaboration can be divided into edge-side collaboration, cloud collaboration, and cloud-edge coordination.

[0003] The basis for realizing collaboration is that the low-voltage devices in the distribution IoT need to be able to achieve self-description and participate in mutual operations. However, due to differences in device manufacturers and product models, the low-voltage devices in the existing distribution IoT often adopt different business data encapsulation methods and design specifications for software and hardware interfaces, which greatly increases the difficulty of connecting and interacting between low-voltage devices in the IoT. The existing node intelligent connection algorithms only work when the physical layer communication protocols of device modules are homogeneous, that is, the devices are produced by the same manufacturer and operate on the same communication protocol, resulting in heterogeneity of the physical layer communication protocols of device modules in heterogeneous networks. The heterogeneity of low-voltage device communication protocols adds obstacles to the mutual communication of non-homologous nodes and non-homomorphic nodes. Due to the large differences of non-homologous nodes, it is difficult for low-voltage devices in the IoT to communicate and interconnect. Summary of the Invention

[0004] To solve the above problems in the prior art, the present invention provides a node intelligent connection method and system based on self-description and interoperability of distribution network devices, which can achieve the interoperability of low-voltage devices in the distribution network and the interactive operation and data sharing between non-homologous device nodes.

[0005] The present invention provides a node intelligent connection method based on self-description and interoperability of distribution network devices, including:

[0006] Step S1, after connecting a predetermined medium and low voltage device to the distribution network, construct a network topology and detect whether the communication signal of the predetermined medium and low voltage device is distorted during transmission. If distortion occurs, proceed to Step S2; if no distortion occurs, the predetermined medium and low voltage device node establishes connections with the first remaining medium and low voltage device nodes in the network topology and the distribution network master station through a handshake protocol, and proceed to Step S3;

[0007] Step S2, determine whether the link delay of the communication signal of the predetermined medium and low voltage device during transmission meets the real-time requirement. If it does not meet the requirement, proceed to Step S3; if it meets the requirement, send a network node status information table to the target medium and low voltage device node, and proceed to Step S4;

[0008] Step S3, send the business card file of the second remaining medium and low voltage device node to the target medium and low voltage device node;

[0009] Step S4, the distribution network master station registers the business card file of the second remaining medium and low voltage device node and updates the network status information table of the second remaining medium and low voltage device node according to the time stamp of the business card file;

[0010] Step S5, according to the communication status of the target medium and low voltage device node and the network status information table of the second remaining medium and low voltage device node, the target medium and low voltage device node and the second remaining medium and low voltage device node perform interactive collaboration;

[0011] Step S6, if there are newly added predetermined medium and low voltage devices continuing to be connected to the distribution network, repeat the above Steps S2 to S5.

[0012] Further, the method for constructing the network topology in Step S1 includes: Step S11, detect the communication status of the first remaining medium and low voltage devices, and construct the network topology by broadcasting and scanning the communication address information of the first remaining medium and low voltage devices.

[0013] Further, the detection of whether the communication signal of the predetermined medium and low voltage device is distorted during transmission in Step S1 includes:

[0014] Step S12, calculate the energy attenuation of the communication signal of the predetermined medium and low voltage device according to the distance between the predetermined medium and low voltage device and the first remaining medium and low voltage devices;

[0015] Step S13, determine whether the energy attenuation meets the communication requirements of the medium and low voltage devices. If it meets the requirements, no distortion occurs; if it does not meet the requirements, distortion occurs.

[0016] Preferably, the handshake protocol uses the TCP three-way handshake protocol.

[0017] Further, the step S5 includes:

[0018] Step S51: Determine whether the target medium - and low - voltage equipment node requests the local sensor data of at least one second remaining medium - and low - voltage equipment node. If so, collect the local sensor data and push it to the target medium - and low - voltage equipment node; if not, proceed to step S52.

[0019] Step S52: Determine whether the local sensor data of the second remaining medium - and low - voltage equipment node has changed. If so, push the changed local sensor data to the target medium - and low - voltage equipment node; if not, proceed to step S53.

[0020] Step S53: Determine whether the target medium - and low - voltage equipment node has received an instruction from the second remaining medium - and low - voltage equipment node. If so, execute the action of the instruction and update the business card file and network status information table of the target medium - and low - voltage equipment node; if not, return to step S51.

[0021] The present invention also provides a node intelligent connection system based on self - description and interoperability of distribution network equipment, including an environmental node detection module, an identity information recognition module, and an interaction and cooperation operation module connected in sequence; wherein,

[0022] The environmental node detection module is configured to: after a predetermined medium - and low - voltage equipment accesses the distribution network, construct a network topology and detect whether the communication signal of the predetermined medium - and low - voltage equipment is distorted during transmission. If it is distorted, enter the identity information recognition module; if not, the predetermined medium - and low - voltage equipment node establishes connections with the first remaining medium - and low - voltage equipment nodes in the network topology and the distribution network master station through a handshake protocol.

[0023] The identity information recognition module is configured to: if the communication signal of the predetermined medium - and low - voltage equipment is distorted during transmission, determine whether the link delay of the communication signal of the predetermined medium - and low - voltage equipment during transmission meets the real - time requirement. If not, send the business card file of the second remaining medium - and low - voltage equipment node to the target medium - and low - voltage equipment node; if it meets the requirement, send the network status information table to the target medium - and low - voltage equipment node. Then, the distribution network master station registers the business card file of the second remaining medium - and low - voltage equipment node and updates the network status information table of the second remaining medium - and low - voltage equipment node according to the timestamp of the business card file.

[0024] The interactive collaboration operation module is set as follows: Determine whether the target medium-voltage and low-voltage device node requests the local sensor data of at least one second remaining medium-voltage and low-voltage device node. If so, collect the local sensor data and push it to the target medium-voltage and low-voltage device node; if not, determine whether the local sensor data of the second remaining medium-voltage and low-voltage device node has changed. If so, push the changed local sensor data to the target medium-voltage and low-voltage device node; if not, determine whether the target medium-voltage and low-voltage device node has received an instruction from the second remaining medium-voltage and low-voltage device node. If so, execute the action of the instruction and update the business card file and network status information table of the target medium-voltage and low-voltage device node; if not, continue to determine whether the target medium-voltage and low-voltage device node requests the local sensor data of at least one second remaining medium-voltage and low-voltage device node.

[0025] A node intelligent connection method and system based on self-description and interoperability of distribution network equipment provided by the present invention realizes the interoperability of medium-voltage and low-voltage equipment, as well as the interactive operation and data sharing between non-homogeneous device nodes with the support of the self-description function of medium-voltage and low-voltage equipment, laying a foundation for the plug-and-play and data collaboration of medium-voltage and low-voltage equipment accessing the distribution network. Moreover, the present invention improves the access efficiency of medium-voltage and low-voltage equipment and realizes a more flexible and intelligent collaborative distribution Internet of Things. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flowchart of the node intelligent connection method based on self-description and interoperability of distribution network equipment according to the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following will give the preferred embodiments of the present invention in conjunction with the drawings and describe them in detail.

[0028] As Figure 1 shown, the node intelligent connection method based on self-description and interoperability of distribution network equipment provided by the present invention includes the following steps:

[0029] Step S1, after connecting a predetermined medium-voltage and low-voltage device to the distribution network, construct a network topology and detect whether the communication signal of the predetermined medium-voltage and low-voltage device is distorted during transmission. If it is distorted, enter step S2; if not, the predetermined medium-voltage and low-voltage device node establishes a connection with the first remaining medium-voltage and low-voltage device nodes and the distribution network master station in the network topology through a handshake protocol, and enter step S3. Among them, the first remaining medium-voltage and low-voltage device nodes refer to the nodes other than the predetermined medium-voltage and low-voltage devices newly added to the distribution network.

[0030] The method for constructing the network topology includes: Step S11, detect the communication status of the first remaining medium-voltage and low-voltage devices in the distribution network environment, and construct a network topology by broadcasting and scanning the communication address information of the first remaining medium-voltage and low-voltage devices.

[0031] Detecting whether the communication signal of the above-mentioned predetermined medium- and low-voltage equipment is distorted during transmission includes the following steps:

[0032] Step S12, since the communication signal will attenuate more as the distance between medium- and low-voltage equipment increases, the energy attenuation of the communication signal of the predetermined medium- and low-voltage equipment is calculated according to the distance between the predetermined medium- and low-voltage equipment and the other medium- and low-voltage equipment.

[0033] The energy attenuation of the communication signal of the predetermined medium- and low-voltage equipment is calculated according to the following formula:

[0034]

[0035] In the formula, a0, a1, and k are attenuation parameters, l is the transmission distance between the predetermined medium- and low-voltage equipment and the first remaining medium- and low-voltage equipment, f is the frequency of the communication signal of the target medium- and low-voltage equipment, and e is the natural constant. Empirical values can be set as a0 = 0, a1 = 7.8×10 -10 s / m, k = 1.

[0036] Step S13, determine whether the energy attenuation of the communication signal of the predetermined medium- and low-voltage equipment meets the communication requirements of the medium- and low-voltage equipment. If it meets the requirements, there is no distortion; if it does not meet the requirements, there is distortion.

[0037] By judging whether the communication signal is distorted during transmission and taking corresponding measures, communication errors can be avoided.

[0038] In this embodiment, the handshake protocol adopts the TCP (Transmission Control Protocol) three-way handshake protocol. The principle and process of establishing a connection based on the TCP protocol are as follows: The TCP packet includes two flag bits: 1) The SYN flag bit, which represents the synchronization sequence number and is used in the connection establishment process; 2) The ACK flag bit, which is used to indicate the acknowledgment sequence number. When it is 1, it means the acknowledgment number is valid, and when it is 0, it means there is no acknowledgment information in the packet and the acknowledgment number is invalid. The first handshake means that when the predetermined medium- and low-voltage device, acting as a client, needs to establish a connection, it sends a SYN packet (seq = x, where seq represents the sequence number) to the server of the distribution network master station, and then the client enters the SYN_SEND state, indicating that the SYN packet has been sent and is waiting for the server of the distribution network master station to confirm. At this time, ACK = 0 and SYN = 1. Since this is the first handshake, there is no ACK flag. The second handshake means that after receiving the SYN packet, the server of the distribution network master station confirms it and then also sends a SYN packet to the client, that is, the server sends a SYN+ACK packet to indicate that the server has confirmed receiving the first handshake from the client and the second handshake is established. At this time, the server enters the SYN_RECV state. At this time, SYN = 1 and ACK = 1. Since this is the second handshake, there is an acknowledgment flag from the server to the client. The third handshake means that after receiving the SYN+ACK packet from the server, the client sends an acknowledgment packet ACK and SYN to the server. After sending this acknowledgment packet, the client and the server enter the ESTABLISHED (established) state, completing the three-way handshake, and then data can be transmitted between the server and the client. At this time, the SYN flag bit is no longer needed because when the ACK flag bit is sent, it means the three-way handshake is successful and the connection has been established.

[0039] Step S2: Determine whether the link delay during the transmission of the communication signal of the predetermined medium- and low-voltage device reaches the real-time requirement. If not, enter step S3; if so, send the network node status information table to the target medium- and low-voltage device node and enter step S4. Each medium- and low-voltage device node in the network topology stores a network node status information table. The content stored in the network node status information table is: A data set in the form of a class or a structure that encapsulates fields such as the source address, destination address, check bit, data packet length, node device category, node priority, and function operation information supported by the node required for each node's communication in a certain order.

[0040] It should be noted that for a predetermined medium- and low-voltage device node, if the node fails to obtain the network status information table, when communicating with other medium- and low-voltage device nodes, it obtains the network status information from other medium- and low-voltage device nodes and caches it, and updates it according to the time stamp of the business card file.

[0041] Step S3: Send the business card files of the second remaining medium- and low-voltage device nodes to the target medium- and low-voltage device node. Herein, the target medium- and low-voltage device node refers to the node that receives / requests local sensor data or receives instructions, and the second remaining medium- and low-voltage device nodes refer to the nodes other than the target medium- and low-voltage device node in the distribution network.

[0042] The present invention uses business card files to format and standardize the description of the information of medium- and low-voltage devices, so as to realize the device portrait analysis and index statistics functions of medium- and low-voltage distribution network devices, accurately and comprehensively evaluate the operating characteristics and health status of medium- and low-voltage distribution network devices, form the integration of various types of information, realize the labeled analysis of the whole-process operation data, and achieve the purpose of device self-description. Non-homologous medium- and low-voltage device nodes can record their own status information and functional operation instructions in a business card file representing the identity information of the device itself. Through the distribution and interaction of the business card files in the distribution network, the mutual recognition and information exchange between each node are completed, and the information of each business card file is recorded by the network node status information table.

[0043] The steps for constructing the business card files of medium- and low-voltage devices in the distribution network include:

[0044] Step S31: Obtain the specifications of the categories, naming, and semantic descriptions of the information collected by the medium- and low-voltage devices, define different logical nodes to model the information such as the status, power, alarm, switch position, and abnormality of the medium- and low-voltage devices, and construct a medium- and low-voltage device information model.

[0045] Step S32: According to the medium- and low-voltage device information model, perform extended modeling on the distribution network protocol, and establish the association relationships between the distribution network master station and the medium- and low-voltage devices, as well as between the medium- and low-voltage devices.

[0046] Step S33: Based on the modeling method and model extension principle of relevant standards, establish a model semantic set and model pattern specification applicable to the distribution network.

[0047] Step S34: According to the above model semantic set and model pattern specification, establish node business cards, and set a timing according to the timestamp of each business card file for regular update.

[0048] In order to standardize the information interaction of non - homologous devices and efficiently transmit service data, it is necessary to design a business card file encapsulated with a standardized data format. By referring to the data model, services, and modeling methods of the IEC 61850 - 7 specification, a hierarchical and object - oriented method is adopted to uniformly model intelligent medium - and low - voltage distribution network devices, including: physical device modeling, server modeling, logical device modeling, logical node modeling, etc. According to the functions of medium - and low - voltage devices in the distribution network system, the corresponding models are extended and defined in accordance with the IEC61850 standard model extension criteria, providing a basic model support for realizing the self - description function of medium - and low - voltage distribution network devices. Table 1 provides a design example of the business card file:

[0049] Table 1 Design example of the business card file

[0050]

[0051]

[0052] Table 1 includes replaceable fields, and medium - and low - voltage devices replace them according to their own function instructions. Usually, the number of function instructions supported by a device is limited (5 - 15), so the usual size of the business card file is 50 - 100 Bytes. The function instruction fields can also be customized according to the business characteristics of the distribution network, for example, changing the function to record status, power, alarms, switch positions, anomalies, etc.

[0053] Step S4, the distribution network master station registers the business card files of the second remaining medium - and low - voltage device nodes, and updates the network status information table of the second remaining medium - and low - voltage device nodes according to the timestamps of the business card files.

[0054] Through the above steps, the present invention can realize functions such as online message debugging, online management, background maintenance, and operation status query of medium - and low - voltage distribution network devices, improve the access efficiency of medium - and low - voltage devices, and achieve full - node observable and measurable of medium - and low - voltage distribution network devices from test access to device operation management.

[0055] Step S5, according to the communication status of the target medium - and low - voltage device node and the network status information table of the second remaining medium - and low - voltage device nodes, the target medium - and low - voltage device node interacts and collaborates with the second remaining medium - and low - voltage device nodes.

[0056] Specifically, step S5 includes:

[0057] Step S51, determine whether the target medium - and low - voltage device node requests data from the local sensors (common sensors for the distribution network) of at least one second remaining medium - and low - voltage device node. If so, collect the local sensor data and push it to the target medium - and low - voltage device node; if not, proceed to step S52.

[0058] Step S52: Determine whether the local sensor data of the second remaining medium- and low-voltage device node has changed. If so, push the changed local sensor data to the target medium- and low-voltage device node to send device function instructions and execute the target action; if not, proceed to Step S53.

[0059] Step S53: Determine whether the target medium- and low-voltage device node has received an instruction from the second remaining medium- and low-voltage device node. If so, execute the action of the instruction and update the business card file and network status information table of the target medium- and low-voltage device node; if not, return to Step S51.

[0060] The above Steps S51 - S53 can be understood as follows: The data processing strategy is divided into two data interaction methods: active push and passive request, and is oriented to two objects: data and instructions. That is, when a medium- and low-voltage device node in the distribution network needs the local sensor data of a certain medium- and low-voltage device node, the sensor of the medium- and low-voltage device node whose data is requested will parse and send the collected data to the medium- and low-voltage device node that needs the data; if no medium- and low-voltage device node requests data from other medium- and low-voltage device nodes, the active push method is adopted. When the local sensor data changes, the data is pushed to the target medium- and low-voltage device node; when the local sensor data has not changed, determine whether a medium- and low-voltage device node in the distribution network has received an action instruction sent by other medium- and low-voltage device nodes. If so, the medium- and low-voltage device node that receives the action instruction executes the action. If not, return to the step of whether there is a medium- and low-voltage device node requesting data and perform a loop judgment. Moreover, each time a medium- and low-voltage device node in the distribution network completes an action, update the business card file and network status information table of the medium- and low-voltage device node.

[0061] In addition, the present invention further includes Step S6. If there are still newly added predetermined medium- and low-voltage devices continuing to be connected to the distribution network, repeat the above Steps S2 - S5 to implement the defect management function of the medium- and low-voltage devices in the distribution network (a defect refers to abnormal local sensor data, indicating that there is a defect in the medium- and low-voltage device corresponding to the sensor and it needs to be repaired and maintained), assist business personnel to timely and accurately discover the defects of medium- and low-voltage devices, realize the full-process online business process flow, and improve the working efficiency of the distribution network.

[0062] By adopting the method of the present invention, when medium and low voltage equipment accesses the distribution network and establishes a connection with the distribution network master station, the communication environment initialization, that is, the network access initialization of the medium and low voltage equipment, is first carried out. During the initialization process, the medium and low voltage equipment transmits relevant information such as device self-description information and service capabilities it possesses to the master station, and the distribution network master station can select the functions it needs within the function items supported by the medium and low voltage equipment. After the initialization process ends, the medium and low voltage equipment and the master station interact the status information of each node, and then the distribution master station updates the distribution master station system according to the information in the self-description file of the medium and low voltage equipment, and the plug-and-play function of the medium and low voltage equipment can be realized.

[0063] In addition, during the communication process, the distribution network master station can also interact with the medium and low voltage equipment. Considering the requirements of the distribution network master station, when a medium and low voltage equipment needs to withdraw from the distribution automation system due to its own failure or abnormal primary equipment, the distribution network master station can timely detect the medium and low voltage equipment, update the distribution network topology information according to the situation, and send it to all medium and low voltage equipment, forming an exit mechanism for medium and low voltage equipment to adapt to the needs of distribution network transformation, expansion and daily maintenance, and realizing closed-loop control.

[0064] The present invention also provides a node intelligent connection system based on distribution network equipment self-description and interoperability. The system includes an environmental node detection module, an identity information recognition module, and an interactive collaborative operation module that are connected in sequence. In the environmental node detection module, the connection of medium and low voltage equipment nodes in the distribution network is realized, and the online and offline of nodes and the online and offline of faulty nodes are established. After completing the environmental node detection, the identity of the medium and low voltage equipment inserted into the distribution network is identified. In the identity recognition module, the information of the medium and low voltage equipment nodes is formatted for self-description to complete the exchange of node information and the recognition of node information. After completing the connection in the first two stages, the medium and low voltage equipment accessing the distribution network can perform interactive collaborative operations through data sharing between nodes, thereby realizing the automatic recognition, plug-and-play, and safe, stable and reliable data transmission services of medium and low voltage distribution network equipment.

[0065] Specifically, the environmental node detection module is set as follows: after a predetermined medium and low voltage equipment accesses the distribution network, a network topology is constructed, and it is detected whether the communication signal of the predetermined medium and low voltage equipment is distorted during transmission. If it is distorted, it enters the identity information recognition module; if there is no distortion, the predetermined medium and low voltage equipment node establishes a connection with the first remaining medium and low voltage equipment nodes in the network topology and the distribution network master station through a handshake protocol.

[0066] The identity information recognition module is set as follows: If the communication signal of the predetermined medium-voltage and low-voltage equipment is distorted during transmission, it is judged whether the link delay during the transmission of the communication signal of the predetermined medium-voltage and low-voltage equipment meets the real-time requirement. If not, the business card file of the second remaining medium-voltage and low-voltage equipment nodes is sent to the target medium-voltage and low-voltage equipment node; if it meets the requirement, the network status information table is sent to the target medium-voltage and low-voltage equipment node. Then, the distribution network master station registers the business card file of the second remaining medium-voltage and low-voltage equipment nodes, and updates the network status information table of the second remaining medium-voltage and low-voltage equipment nodes according to the time stamp of the business card file.

[0067] The interaction and collaboration operation module is set as follows: It is judged whether the target medium-voltage and low-voltage equipment node requests the local sensor data of at least one second remaining medium-voltage and low-voltage equipment node. If so, the local sensor data is collected and pushed to the target medium-voltage and low-voltage equipment node; if not, it is judged whether the local sensor data of the second remaining medium-voltage and low-voltage equipment node has changed. If so, the changed local sensor data is pushed to the target medium-voltage and low-voltage equipment node to send device function instructions and execute target actions; if not, it is judged whether the target medium-voltage and low-voltage equipment node has received the instructions of the second remaining medium-voltage and low-voltage equipment node. If so, the actions of the instructions are executed, and the business card file and network status information table of the target medium-voltage and low-voltage equipment node are updated; if not, it continues to judge whether the target medium-voltage and low-voltage equipment node requests the local sensor data of at least one second remaining medium-voltage and low-voltage equipment node.

[0068] When newly added medium-voltage and low-voltage equipment continues to be connected to the distribution network, the identity information recognition module and the interaction and collaboration operation module are repeatedly executed.

[0069] The present invention has the following beneficial effects:

[0070] 1) Eliminate the limitations of inconsistent medium-voltage and low-voltage equipment models and hardware interfaces in the distribution network, realize the interaction operation and data sharing between non-homogeneous equipment nodes, and realize the interoperability of medium-voltage and low-voltage equipment with the support of the self-description function of medium-voltage and low-voltage equipment in the distribution network. By establishing a standardized node business card for the self-description information of medium-voltage and low-voltage equipment, it lays a foundation for the plug-and-play technology of medium-voltage and low-voltage equipment accessing the distribution network;

[0071] 2) Based on the self-description function of medium-voltage and low-voltage equipment in the distribution network, utilize the device self-description file structure to improve the access efficiency of medium-voltage and low-voltage equipment in the distribution network. Through the collaborative node intelligent connection process, realize the intelligent acquisition, transmission and interaction of distribution network system data, and realize a more flexible and intelligent collaborative distribution Internet of Things.

[0072] The above are only the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Various changes can be made to the above embodiments of the present invention. That is, all simple, equivalent changes and modifications made in accordance with the claims and the content of the specification of the present invention application fall within the scope of protection of the claims of the present invention patent. Those not described in detail in the present invention are all conventional technical contents.

Claims

1. A node intelligent connection method based on self-description and interoperability of distribution network equipment, characterized in that Including: Step S1: After connecting a predetermined medium-voltage and low-voltage device to the distribution network, construct a network topology and detect whether the communication signal of the predetermined medium-voltage and low-voltage device is distorted during transmission. If it is distorted, go to Step S2; if not, the predetermined medium-voltage and low-voltage device node establishes connections with the first remaining medium-voltage and low-voltage device nodes in the network topology and the distribution network master station through a handshake protocol, and enter Step S3; Step S2: Determine whether the link delay of the communication signal of the predetermined medium-voltage and low-voltage device during transmission meets the real-time requirement. If it does not meet the requirement, enter Step S3; If it meets the requirement, send a network node status information table to the target medium-voltage and low-voltage device node, and enter Step S4; Step S3: Send the business card files of the second remaining medium-voltage and low-voltage device nodes to the target medium-voltage and low-voltage device node; Step S4: The distribution network master station registers the business card files of the second remaining medium-voltage and low-voltage device nodes and updates the network status information table of the second remaining medium-voltage and low-voltage device nodes according to the timestamps of the business card files; Step S5: According to the communication status of the target medium-voltage and low-voltage device node and the network status information table of the second remaining medium-voltage and low-voltage device nodes, the target medium-voltage and low-voltage device node interacts and collaborates with the second remaining medium-voltage and low-voltage device nodes; Step S6: If there are newly added predetermined medium-voltage and low-voltage devices continuing to be connected to the distribution network, repeat the above Steps S2 to S5; The said Step S5 includes: Step S51: Determine whether the target medium-voltage and low-voltage device node requests the local sensor data of at least one second remaining medium-voltage and low-voltage device node. If so, collect the local sensor data and push it to the target medium-voltage and low-voltage device node; if not, enter Step S52; Step S52: Determine whether the local sensor data of the second remaining medium-voltage and low-voltage device node has changed. If so, push the changed local sensor data to the target medium-voltage and low-voltage device node; if not, enter Step S53; Step S53: Determine whether the target medium-voltage and low-voltage device node has received an instruction from the second remaining medium-voltage and low-voltage device node. If so, execute the action of the instruction and update the business card file and network status information table of the target medium-voltage and low-voltage device node; if not, return to Step S51.

2. The node intelligent connection method based on self-description and interoperability of distribution network equipment according to claim 1, wherein The method for constructing the network topology in the said Step S1 includes: Step S11, detect the communication status of the first remaining medium-voltage and low-voltage devices, and construct the network topology by broadcasting and scanning the communication address information of the first remaining medium-voltage and low-voltage devices.

3. The node intelligent connection method based on self-description and interoperability of distribution network equipment according to claim 1, characterized in that, The detection of whether the communication signal of the predetermined medium-voltage and low-voltage device is distorted during transmission in the said Step S1 includes: Step S12: According to the distance between the predetermined medium-voltage and low-voltage device and the first remaining medium-voltage and low-voltage devices, calculate the energy attenuation of the communication signal of the predetermined medium-voltage and low-voltage device; Step S13: Determine whether the energy attenuation meets the communication requirements of the medium-voltage and low-voltage devices. If it meets the requirements, there is no distortion; if it does not meet the requirements, there is distortion.

4. The node intelligent connection method based on self-description and interoperability of distribution network equipment according to claim 1, characterized in that The said handshake protocol adopts the TCP three-way handshake protocol.

5. A node intelligent connection system based on self-description and interoperability of distribution network equipment, characterized in that, It includes an environment node detection module, an identity information recognition module, and an interaction and collaboration operation module that are connected in sequence; among them, The environment node detection module is configured to: after a predetermined medium-voltage and low-voltage device is connected to the distribution network, construct a network topology and detect whether the communication signal of the predetermined medium-voltage and low-voltage device is distorted during transmission. If distortion occurs, it enters the identity information recognition module; if no distortion occurs, the predetermined medium-voltage and low-voltage device node establishes connections with the first remaining medium-voltage and low-voltage device nodes in the network topology and the distribution network main station through a handshake protocol; The identity information recognition module is configured to: if the communication signal of the predetermined medium-voltage and low-voltage device is distorted during transmission, determine whether the link delay of the communication signal of the predetermined medium-voltage and low-voltage device during transmission meets the real-time requirement. If it does not meet the requirement, send the business card file of the second remaining medium-voltage and low-voltage device node to the target medium-voltage and low-voltage device node; if it meets the requirement, send the network status information table to the target medium-voltage and low-voltage device node; then the distribution network main station registers the business card file of the second remaining medium-voltage and low-voltage device node and updates the network status information table of the second remaining medium-voltage and low-voltage device node according to the timestamp of the business card file; The interaction and collaboration operation module is configured to: determine whether the target medium-voltage and low-voltage device node requests the local sensor data of at least one second remaining medium-voltage and low-voltage device node. If so, collect the local sensor data and push it to the target medium-voltage and low-voltage device node; if not, determine whether the local sensor data of the second remaining medium-voltage and low-voltage device node has changed. If so, push the changed local sensor data to the target medium-voltage and low-voltage device node; if not, determine whether the target medium-voltage and low-voltage device node has received an instruction from the second remaining medium-voltage and low-voltage device node. If so, execute the action of the instruction and update the business card file and network status information table of the target medium-voltage and low-voltage device node; if not, continue to determine whether the target medium-voltage and low-voltage device node requests the local sensor data of at least one second remaining medium-voltage and low-voltage device node.

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