Time-sensitive network communication method, system and equipment for network access of substation equipment and medium

Abstract

The invention relates to the technical field of substation communication, and discloses a time-sensitive network communication method, system, equipment and medium for substation equipment network access, comprising the following steps: introducing a time-sensitive network into substation equipment, dividing the substation equipment into different network communication terminals according to message types, and distinguishing terminal service traffic through a virtual local area network, the service flow is managed and optimized; performing multi-protocol optimization on the sent transformer substation sampling message, entering a time synchronization network, and generating a scheduling strategy of the transformer substation sampling message; and filtering the sent general substation event message, entering a time synchronization network, and generating a scheduling strategy of the general substation event message. According to the invention, corresponding shaping optimization is carried out on the time-triggered traffic and the event-triggered traffic, so that the key service traffic can be transmitted in a lower-delay jitter manner after entering the network, and excessive cost overhead and signal delay overhead are not increased.

Description

Technical Field

[0001] The present invention relates to the field of substation communication technology, and in particular to a time-sensitive network communication method, system, equipment and medium for substation equipment to access the network. Background Art

[0002] my country's energy Internet of Things (IoT) and smart substations are rapidly developing. In modern transmission networks, primary equipment such as sensors and actuators, as well as secondary equipment such as protection, measurement, and control, are all installed in substations. Based on the fundamental requirements of full-station information digitization, networked communication platforms, and standardized information sharing, these technologies enable advanced applications such as grid automation control, intelligent regulation, and online decision-making. In this environment, the control and regulation of critical substation information is becoming increasingly sophisticated, necessitating reliable communication support in an open and shared environment.

[0003] In large-scale smart substation networks with complex information flows, improving distributed grid-connected efficiency and optimizing dispatching and control strategies are key development areas. Time-Sensitive Networking (TSN) is an IEEE protocol standard rebranded by the Audio Video Bridging (AVB) Working Group. The main reason TSN hasn't been adopted in large-scale networks is that its service traffic is unstable and existing devices that don't support TSN have difficulty connecting to the network. Summary of the Invention

[0004] In view of the above existing problems, the present invention is proposed. Therefore, the present invention provides a time-sensitive network communication method for substation equipment to access the network to solve the above problems.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides a time-sensitive network communication method for substation equipment accessing a network, comprising: introducing a time-sensitive network into the substation equipment, dividing the equipment into different network communication terminals according to message type, distinguishing terminal service traffic through a virtual local area network, and managing and optimizing the service traffic;

[0007] Based on the network communication terminal, the substation sampling message sent is optimized through multiple protocols, enters the time synchronization network, and generates a scheduling strategy for the substation sampling message;

[0008] Based on the network communication terminal, the sent universal substation event message is filtered and entered into the time synchronization network, and a scheduling strategy for the universal substation event message is generated.

[0009] As a preferred solution of the time-sensitive network communication method for substation equipment accessing the network according to the present invention, wherein: based on the network communication terminal, the sent substation sampling message is subjected to multiple protocol optimizations including:

[0010] Through the network communication terminal, the substation sampling message sent is optimized for communication through a time synchronization mechanism, a flow filtering management mechanism, and a flow cyclic queuing forwarding mechanism, and enters the time synchronization network to complete the cyclic queuing periodic transmission of the substation sampling message;

[0011] The beneficial effect of this preferred solution is high bandwidth utilization, and it can better adapt to dynamic traffic such as GOOSE event messages.

[0012] As a preferred solution of the time-sensitive network communication method for substation equipment accessing the network according to the present invention, the scheduling strategy for generating the substation sampling message includes:

[0013] Performing flow filtering management on the substation sampling message sent by the merging unit, identifying the priority, frame length, virtual local area network number, and source MAC address of the substation sampling message, performing internal priority conversion on the substation sampling message, and filtering non-substation sampling messages;

[0014] A flow cyclic queuing and forwarding algorithm is introduced into the filtered substation sampling message to perform cyclic queuing and forwarding on the traffic, divide the time into fixed periods, and perform hard real-time transmission through time slicing and double queue rotation.

[0015] As a preferred solution of the time-sensitive network communication method for substation equipment accessing the network according to the present invention, the flow round-robin queuing forwarding algorithm includes:

[0016] The flow round-robin queuing forwarding algorithm adopts a dual-queue alternating working mode;

[0017] During an even cycle, the first queue buffers the substation sampling message and does not transmit it, while the second queue transmits the odd accumulated frames and does not receive any frames;

[0018] During odd-numbered cycles, the second queue buffers the substation sampling message and does not transmit it, while the first queue transmits even-numbered accumulated frames and does not receive any frames;

[0019] The output message is transmitted according to the set cycle;

[0020] The beneficial effect of this preferred solution is to perform cyclic queuing and forwarding of traffic, and to achieve hard real-time transmission through time slicing and dual-queue round-robin.

[0021] As a preferred solution of the time-sensitive network communication method for substation equipment access to the network described in the present invention, wherein: through the network communication terminal, the general substation event message sent is introduced with a queue scheduling forwarding mechanism, a flow filtering management mechanism and a time synchronization mechanism to shape the general substation event message and receive abnormal event information in a timely manner.

[0022] The beneficial effects of this preferred solution are that it can be applied to more complex networks, has high certainty, and avoids communication situations such as congestion and loss of control.

[0023] As a preferred solution of the time-sensitive network communication method for substation equipment accessing the network according to the present invention, the scheduling strategy for generating the general substation event message includes:

[0024] Performing flow filtering management on the general substation event messages sent by the measurement and control terminals and the intelligent terminals, identifying the priority, frame length, virtual local area network number, and source MAC address of the general substation event messages, performing internal priority conversion on the general substation event messages, and filtering unicast messages and broadcast messages;

[0025] A credit-based shaper algorithm is introduced into the filtered general substation event message, and bandwidth allocation of traffic with different priorities is balanced through a dynamic credit mechanism, thereby enhancing the forwarding of traffic queues.

[0026] As a preferred solution of the time-sensitive network communication method for substation equipment accessing the network according to the present invention, the credit-based shaper algorithm includes:

[0027] The same credit-based shaper trust value is assigned to both the measurement and control terminals and the intelligent terminals. The credit value of each traffic flow is accumulated and consumed at the same rate, so that the three types of traffic have the same long-term bandwidth share and are evenly shaped and distributed at the network egress.

[0028] The abnormal information input to the protection device is transmitted according to the trust value of the credit-based shaper and cyclically transmitted according to the abnormal shaped traffic;

[0029] The general substation event message sent by the protection device is output after being subjected to flow filtering management and time synchronization mechanism;

[0030] The beneficial effect of this preferred solution is to balance the bandwidth allocation of traffic with different priorities through a dynamic credit mechanism, thereby achieving enhanced forwarding of traffic queues.

[0031] In a second aspect, the present invention provides a time-sensitive network communication system for substation equipment accessing a network, comprising:

[0032] The networking module is used to introduce a time-sensitive network to substation equipment, divide it into different network communication terminals according to message type, distinguish terminal service traffic through virtual local area networks, and manage and optimize the service traffic;

[0033] A first scheduling module is configured to optimize the substation sampling message sent by the network communication terminal through multiple protocols, enter the time synchronization network, and generate a scheduling strategy for the substation sampling message;

[0034] The second scheduling module is used to filter the sent universal substation event message based on the network communication terminal, enter the time synchronization network, and generate a scheduling strategy for the universal substation event message.

[0035] In a third aspect, the present invention provides a computer device, comprising:

[0036] memory and processor;

[0037] The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the time-sensitive network communication method for substation equipment to access the network are implemented.

[0038] In a fourth aspect, the present invention provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the time-sensitive network communication method for substation equipment to access the network.

[0039] Compared with the existing technology, the beneficial effects of the present invention are as follows: relative to the TSN design method for delay guarantee, the present invention proposes a traffic optimization and guarantee solution for existing substation equipment before it enters the network, and performs corresponding shaping optimization for time-triggered and event-triggered traffic, so that key business traffic can be transmitted with lower delay and jitter after entering the network; the present invention can ensure that the traffic transmitted by each terminal device meets the time-sensitive network requirements after entering the network without changing the existing equipment, and will not increase excessive cost and signal delay overhead; the present invention requires existing equipment and TSN switching equipment to form a group of TSN terminals. The TSN switching equipment only needs to support part of the TSN protocol, and there is no need to develop other Layer 2 protocols and it will not increase much forwarding delay. The design difficulty and cost are relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0041] Figure 1 This is a schematic diagram of the overall process of a time-sensitive network communication method for substation equipment accessing the network according to an embodiment of the present invention;

[0042] Figure 2 This is a TSN terminal composition framework diagram of a time-sensitive network communication method for substation equipment accessing the network according to an embodiment of the present invention;

[0043] Figure 3 A diagram of a TSN terminal substation sampling (SV) message scheduling strategy for a time-sensitive network communication method for substation equipment access according to an embodiment of the present invention;

[0044] Figure 4 This is a TSN terminal general substation event (GOOSE) message scheduling strategy diagram of the time-sensitive network communication method for substation equipment access to the network according to an embodiment of the present invention. DETAILED DESCRIPTION

[0045] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the following detailed description of the specific embodiments of the present invention is given in conjunction with the accompanying drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without creative work should fall within the scope of protection of the present invention.

[0046] Reference Figure 1-Figure 4 , is an embodiment of the present invention, which provides a time-sensitive network communication method for substation equipment to access the network, such as Figure 1 Shown, including:

[0047] S101: Introducing a time-sensitive network to substation equipment, dividing it into different network communication terminals based on message type, and using virtual local area networks to differentiate terminal service traffic, thereby managing and optimizing service traffic.

[0048] S102, based on the network communication terminal, the sent substation sampling message is optimized through multiple protocols, enters the time synchronization network, and generates a scheduling strategy for the substation sampling message;

[0049] S103: Based on the network communication terminal, the sent general substation event message is filtered and processed, enters the time synchronization network, and generates a scheduling strategy for the general substation event message.

[0050] It should be noted that in traditional smart substation networks, Substation Sampling (SV) messages are shared with Generalized Substation Event (GOOSE) messages. Other business traffic and the high throughput of SV can block GOOSE's emergency signals. Time-Sensitive Networking (TSN) is a new generation of Ethernet enhancement technology that can achieve deterministic latency and multi-business convergence. Customized terminal devices connected to TSN switches effectively ensure low-latency and low-jitter transmission of SV and GOOSE messages in multi-business scenarios. However, the deployment and actual implementation of TSN networks in substations are still quite difficult. The main reason is that most existing equipment does not support the TSN protocol and is difficult to directly connect to the network, and the cost of modifying existing equipment is too high.

[0051] Furthermore, SV messages are mainly used to transmit digital sampling values of analog quantities such as current and voltage. These sampling values usually come from the transformers in the substation (such as current transformers and voltage transformers), and are digitized and sent out through the merging unit (MU). The merging unit regularly collects analog signals from the transformers and converts them into digital signals. Then, according to the specified format and time interval, these digital signals are packaged into SV messages and sent to related protection devices, measuring equipment or monitoring systems via Ethernet.

[0052] GOOSE messages are an efficient and fast information exchange mechanism used to transmit status change information (such as switch position, protection tripping commands, etc.) in substation automation systems. They allow key information to be exchanged directly between intelligent electronic devices (IEDs). When an IED detects an event (such as a change in circuit breaker status), it immediately generates a GOOSE message and broadcasts this message to the entire substation network. After receiving this message, other related IEDs will take corresponding actions (such as executing a tripping operation) based on its content. Both messages are based on the IEC 61850 standard, which defines communication networks and systems in the field of power system automation.

[0053] In an optional implementation, the TSN terminal architecture can introduce existing devices that do not have TSN features into the time-sensitive network without changing the existing equipment, while managing and optimizing the critical business traffic of the substation. Figure 2 TSN terminal composition framework diagram.

[0054] A small TSN switching device is added between the bottom-layer terminal equipment and the process-layer transmission equipment in the substation. The terminal equipment and the TSN switching device form a group of TSN terminals. The TSN terminal can directly access the process-layer time-sensitive network and is compatible with traditional industrial Ethernet. Multiple terminal devices can form multiple groups of TSN terminals with one TSN switching device, and the terminal business traffic is distinguished through the virtual local area network (VLAN).

[0055] In an optional embodiment, different TSN terminal groups are divided according to different substation equipment flow characteristics. Preferably, the time-triggered messages transmitted by the merging unit are divided into one group of TSN terminals; the event-triggered messages transmitted by the measurement and control terminal, intelligent terminal, and protection device are divided into one group of TSN terminals.

[0056] In a preferred embodiment, based on the network communication terminal, the substation sampling message sent is optimized through multiple protocols including:

[0057] Through the network communication terminal, the substation sampling message sent is optimized through the time synchronization mechanism, flow filtering management mechanism and flow cyclic queuing forwarding mechanism, and enters the time synchronization network to complete the cyclic queuing periodic transmission of the substation sampling message.

[0058] It should be noted that SV messages are periodic messages transmitted point-to-point. The TSN terminal SV message scheduling strategy is as follows: Figure 3 As shown, the message cycle period is set, which can be set according to the actual application scenario. This embodiment takes the SV message with a cycle period of 1ms as an example. Through the scheduling strategy of the substation sampling message of this embodiment, due to its terminal clock deviation, the arrival time has a ±1us error relative to the reference time.

[0059] In an optional embodiment, the VLAN group 1 of the intelligent substation merging unit and the TSN switching device forms a group of TSN terminals. The SV messages sent by the merging unit are optimized by the time synchronization protocol (IEEE 802.1AS), the flow filtering management protocol (IEEE 802.1QCI) and the flow cyclic queuing and forwarding mechanism (IEEE 802.1QCH) and enter the time synchronization network. That is, for the SV messages sent by the merging unit in real time, the Qch cyclic queuing and forwarding mechanism, the Qci flow filtering management mechanism, and the 802.1AS time synchronization mechanism are introduced under the TSN terminal architecture to optimize the SV messages so that they are transmitted strictly according to the cyclic queuing cycle.

[0060] In a preferred embodiment, the scheduling strategy for generating substation sampling messages includes:

[0061] Perform flow filtering management (802.1QCI) on the substation sampling messages sent by the merging unit, identify the priority, frame length, virtual LAN number, and source MAC address of the substation sampling messages, perform internal priority conversion on the substation sampling messages, and filter non-substation sampling messages;

[0062] A cyclic queuing and forwarding (CQF) algorithm (a time-aware shaping mechanism defined in IEEE 802.1Qch) is introduced into the filtered substation sampling messages to perform cyclic queuing and forwarding on the traffic, dividing the time into fixed periods and performing hard real-time transmission through time slicing and dual-queue round-robin.

[0063] In an optional implementation, the SV message is defined as priority 4, and the flow filtering management mechanism performs internal priority conversion on the SV message to ensure that the SV message with the wrong priority can be transmitted to the correct priority queue.

[0064] In a preferred embodiment, the flow round-robin queuing forwarding algorithm includes:

[0065] The flow round-robin queuing forwarding algorithm adopts a dual-queue alternating working mode;

[0066] During even-numbered cycles, the first queue buffers substation sampling messages and does not transmit them, while the second queue transmits odd-numbered accumulated frames and does not receive any frames;

[0067] During odd-numbered cycles, the second queue buffers substation sampling messages and does not transmit them, while the first queue transmits even-numbered accumulated frames and does not receive any frames;

[0068] The output message is transmitted according to the set cycle period, and the message arrival time is known.

[0069] It should be noted that the traditional SV message scheduling strategy uses the VLAN header to mark the SV priority (set higher) to give it priority over other business traffic transmission; set static bandwidth reservation to allocate fixed bandwidth to SV. This setting has low bandwidth utilization and cannot adapt to dynamic traffic, namely GOOSE event messages.

[0070] In another optional implementation, in the optimization of SV messages, a preemptive transmission mechanism (IEEE 802.1Qbu) can also be used to allow high-priority messages to interrupt low-priority messages being transmitted, reducing the waiting time of critical messages and significantly reducing the transmission delay of sampled messages; an asynchronous traffic shaping (ATS, IEEE 802.1Qcr) mechanism can also be used to reduce queuing delay and jitter by dynamically adjusting the message sending interval, which can simplify network deployment without the need for global clock synchronization; deterministic network (DetNet) end-to-end scheduling can also be used, combined with DetNet's traffic engineering (TE) and resource reservation (RSVP-TE) to achieve deterministic delay of the entire network path, providing end-to-end bounded delay and zero congestion packet loss. The above mechanisms can also be used in combination.

[0071] In a preferred embodiment, based on the network communication terminal, the substation sampling message sent is optimized through multiple protocols including:

[0072] Through the network communication terminal, a queue scheduling forwarding mechanism, a flow filtering management mechanism and a time synchronization mechanism are introduced for the general substation event messages sent, so as to shape the general substation event messages and receive abnormal event information in a timely manner.

[0073] In an optional implementation, the VLAN group 2 of the intelligent substation measurement and control terminal, protection device, and intelligent terminal TSN switch forms a group of TSN terminals. The GOOSE message sent by the protection device is filtered and managed (IEEE802.1QCI) and enters the time synchronization network; the abnormal information sent by the measurement and control terminal and the intelligent terminal to the protection device is shaped through filtering management (IEEE 802.1QCI) and queue forwarding enhancement mechanism (IEEE 802.1QAV) to ensure that the protection device can receive the abnormal information in time. That is, for the GOOSE messages sent by the measurement and control terminal, intelligent terminal, and protection device, the Qav queue scheduling and forwarding mechanism, Qci flow filtering management mechanism, and 802.1AS time synchronization mechanism are introduced under the TSN terminal architecture to shape the GOOSE messages.

[0074] In an optional implementation, the TSN terminal GOOSE message abnormal information scheduling strategy is as follows: Figure 4 As shown in the figure, it is assumed that there are two measurement and control terminals and one intelligent terminal hanging under a protection device. The measurement and control terminals and the intelligent terminal transmit abnormal information to the protection device in real time. The abnormal information includes whether the circuit breaker position is consistent with the expectation, whether the control command execution is effective, whether the sampling value is synchronized, the AD module fault condition, and whether the data quality is abnormal. The protection device sends a GOOSE event message based on the abnormal information transmitted by the measurement and control terminals and the intelligent terminal.

[0075] In a preferred embodiment, the scheduling strategy for generating a general substation event message includes:

[0076] Performs flow filtering management on general substation event messages sent by measurement and control terminals and intelligent terminals, identifies the priority, frame length, virtual LAN number, and source MAC address of general substation event messages, performs internal priority conversion on general substation event messages, and filters unicast and broadcast messages;

[0077] A credit-based shaper algorithm (CBS) is introduced for filtered general substation event messages. The bandwidth allocation of traffic with different priorities is balanced through a dynamic credit mechanism, and the forwarding of traffic queues is enhanced.

[0078] In an optional implementation, the exception information message is defined as priority 2, and the flow filtering management mechanism performs internal priority conversion on the exception information message to ensure that the exception information message with the wrong priority can be transmitted to the correct priority queue.

[0079] It should be noted that CBS is the core algorithm for traffic shaping, which is used to control the bandwidth usage of different levels of traffic, balance the bandwidth allocation of traffic of different priorities through a dynamic credit mechanism, and achieve forwarding enhancement of traffic queues.

[0080] In a preferred embodiment, the credit-based shaper algorithm includes:

[0081] The same credit-based shaper trust value is assigned to both the measurement and control terminals and the intelligent terminals. The credit value of each traffic flow is accumulated and consumed at the same rate, so that the three types of traffic have the same long-term bandwidth share and are evenly shaped and distributed at the network egress, namely the Audio Video Bridging (AVB) switch port.

[0082] The abnormal information input to the protection device is passed according to the trust value of the credit-based shaper and transmitted cyclically according to the traffic after abnormal shaping;

[0083] The general substation event message sent by the protection device is output after flow filtering management and time synchronization mechanism.

[0084] It should be noted that AVB is a set of IEEE network standards used to support time synchronization and bandwidth reservation, ensuring real-time transmission of audio and video data on Ethernet. At the egress, the AVB traffic shaping mechanism is used to forward data in an orderly manner according to the set ratio, avoiding congestion and delay jitter.

[0085] In another optional implementation, the optimization of GOOSE messages can also adopt the frame preemption mechanism (Frame Preemption, IEEE 802.1Qbu & IEEE 802.3br), which allows the low-priority data frames being sent to be interrupted, sends high-priority frames (such as GOOSE messages) first, and then resumes the original transmission. This can significantly reduce the end-to-end delay of GOOSE messages and avoid the delay of key event information due to link congestion; the time-aware gating mechanism (Time-Aware Shaper, TAS, IEEE 802.1Qbv) can also be used to configure a "gating schedule" for each type of service, specifying the time period in which it can send data, and implement strict GOOSE message sending window control, which can avoid conflicts with other traffic and support multi-terminal collaborative scheduling. The above mechanisms can also be used in combination.

[0086] It should be noted that the traditional GOOSE message scheduling strategy is mainly based on priority marking and strict priority queues to ensure the rapid transmission of GOOSE messages. It is suitable for low-complexity networks, but there are problems such as insufficient certainty and congestion out of control. The present invention can be applied to more complex networks, has high certainty, and avoids communication situations such as congestion out of control.

[0087] Compared with the TSN design method for ensuring latency, the present invention proposes a traffic optimization and protection solution for existing substation equipment before it enters the network. It performs corresponding shaping optimization on two types of traffic: time-triggered and event-triggered, so that key business traffic can be transmitted with lower latency and jitter after entering the network. The present invention can ensure that the traffic transmitted by each terminal device meets the time-sensitive network requirements after entering the network without changing the existing equipment, and will not increase excessive cost and signal delay overhead. The present invention requires existing equipment and TSN switching equipment to form a group of TSN terminals. The TSN switching equipment only needs to support part of the TSN protocol, and there is no need to develop other Layer 2 protocols and it will not increase much forwarding delay. The design difficulty and cost are relatively low.

[0088] The above is a schematic diagram of a time-sensitive network communication method for substation equipment accessing a network according to this embodiment. It should be noted that the technical solution of this time-sensitive network communication system for substation equipment accessing a network is based on the same concept as the technical solution of the time-sensitive network communication method for substation equipment accessing a network described above. For details not described in detail in the technical solution of the time-sensitive network communication system for substation equipment accessing a network according to this embodiment, please refer to the description of the technical solution of the time-sensitive network communication method for substation equipment accessing a network described above.

[0089] Example 2

[0090] This embodiment provides a time-sensitive network communication system for substation equipment accessing a network, including:

[0091] The networking module is used to introduce a time-sensitive network to substation equipment, divide it into different network communication terminals according to message type, distinguish terminal business traffic through virtual local area networks, and manage and optimize business traffic;

[0092] The first scheduling module is used to optimize the substation sampling message sent by the network communication terminal through multiple protocols, enter the time synchronization network, and generate a scheduling strategy for the substation sampling message;

[0093] The second scheduling module is used to filter and process the sent general substation event message based on the network communication terminal, enter the time synchronization network, and generate a scheduling strategy for the general substation event message.

[0094] Example 3

[0095] This embodiment provides a computer device applicable to time-sensitive network communication for substation equipment accessing the network, including:

[0096] Memory and processor; the memory is used to store computer-executable instructions, and the processor is used to execute computer-executable instructions to implement the time-sensitive network communication method for substation equipment access to the network as proposed in the above embodiment.

[0097] This embodiment further provides a storage medium storing a computer program, which, when executed by a processor, implements the time-sensitive network communication method for implementing network access of substation equipment as proposed in the above embodiment.

[0098] The storage medium proposed in this embodiment and the time-sensitive network communication method for realizing network access of substation equipment proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0099] Through the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented with the help of software and necessary general-purpose hardware, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as a computer's floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods of various embodiments of the present invention.

[0100] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A time-sensitive network communication method for substation equipment accessing the network, characterized in that: include: Introducing a time-sensitive network into substation equipment, dividing it into different network communication terminals according to message type, distinguishing terminal service traffic through virtual local area networks, and managing and optimizing the service traffic; Based on the network communication terminal, the substation sampling message sent is optimized through multiple protocols, enters the time synchronization network, and generates a scheduling strategy for the substation sampling message; Based on the network communication terminal, the sent universal substation event message is filtered and entered into the time synchronization network, and a scheduling strategy for the universal substation event message is generated.

2. A time-sensitive network communication method for substation equipment accessing the network according to claim 1, characterized in that: include: Based on the network communication terminal, the sent substation sampling message undergoes multiple protocol optimizations including: Through the network communication terminal, the substation sampling message sent is optimized for communication through the time synchronization mechanism, flow filtering management mechanism and flow cyclic queuing forwarding mechanism, enters the time synchronization network, and completes the cyclic queuing periodic transmission of the substation sampling message.

3. A time-sensitive network communication method for substation equipment accessing the network according to claim 2, characterized in that: The scheduling strategy for generating the substation sampling message includes: Performing flow filtering management on the substation sampling message sent by the merging unit, identifying the priority, frame length, virtual local area network number, and source MAC address of the substation sampling message, performing internal priority conversion on the substation sampling message, and filtering non-substation sampling messages; A flow cyclic queuing and forwarding algorithm is introduced into the filtered substation sampling message to perform cyclic queuing and forwarding on the traffic, divide the time into fixed periods, and perform hard real-time transmission through time slicing and double queue rotation.

4. A time-sensitive network communication method for substation equipment accessing the network according to claim 3, characterized in that: The flow round-robin queuing forwarding algorithm includes: The flow round-robin queuing forwarding algorithm adopts a dual-queue alternating working mode; During an even cycle, the first queue buffers the substation sampling message and does not transmit it, while the second queue transmits the odd accumulated frames and does not receive any frames; During odd-numbered cycles, the second queue buffers the substation sampling message and does not transmit it, while the first queue transmits even-numbered accumulated frames and does not receive any frames; The output message is transmitted according to the set cycle period.

5. A time-sensitive network communication method for substation equipment accessing the network according to claim 1 or 4, characterized in that: Based on the network communication terminal, the substation sampling message sent is optimized through multiple protocols including: Through the network communication terminal, a queue scheduling forwarding mechanism, a flow filtering management mechanism and a time synchronization mechanism are introduced into the sent general substation event message to shape the general substation event message and receive abnormal event information in time.

6. A time-sensitive network communication method for substation equipment accessing the network according to claim 5, characterized in that: The dispatching strategy for generating the general substation event message includes: Performing flow filtering management on the general substation event messages sent by the measurement and control terminals and the intelligent terminals, identifying the priority, frame length, virtual local area network number, and source MAC address of the general substation event messages, performing internal priority conversion on the general substation event messages, and filtering unicast messages and broadcast messages; A credit-based shaper algorithm is introduced into the filtered general substation event message, and bandwidth allocation of traffic with different priorities is balanced through a dynamic credit mechanism, thereby enhancing the forwarding of traffic queues.

7. A time-sensitive network communication method for substation equipment accessing the network according to claim 6, characterized in that: The credit-based shaper algorithm includes: The same credit-based shaper trust value is assigned to both the measurement and control terminals and the intelligent terminals. The credit value of each traffic flow is accumulated and consumed at the same rate, so that the three types of traffic have the same long-term bandwidth share and are evenly shaped and distributed at the network egress. The abnormal information input to the protection device is transmitted according to the trust value of the credit-based shaper and cyclically transmitted according to the abnormal shaped traffic; The general substation event message sent by the protection device is output after being subjected to flow filtering management and time synchronization mechanism.

8. A time-sensitive network communication system for substation equipment accessing the network, applying the time-sensitive network communication method for substation equipment accessing the network according to any one of claims 1 to 7, characterized in that: include, The networking module is used to introduce a time-sensitive network to substation equipment, divide it into different network communication terminals according to message type, distinguish terminal service traffic through virtual local area networks, and manage and optimize the service traffic; A first scheduling module is configured to optimize the substation sampling message sent by the network communication terminal through multiple protocols, enter the time synchronization network, and generate a scheduling strategy for the substation sampling message; The second scheduling module is used to filter the sent universal substation event message based on the network communication terminal, enter the time synchronization network, and generate a scheduling strategy for the universal substation event message.

9. A computer device, characterized in that: include: memory and processor; The memory is used to store computer-executable instructions, and the processor is used to execute the computer-executable instructions. When the computer-executable instructions are executed by the processor, the steps of the time-sensitive network communication method for substation equipment accessing the network as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that It stores computer-executable instructions, which, when executed by a processor, implement the steps of a time-sensitive network communication method for substation equipment accessing the network as described in any one of claims 1 to 7.

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