Large power grid safety and stability control system remote virtual simulation method and system

Abstract

The invention discloses a large power grid security and stability control system remote virtual simulation method and system, and the method comprises the steps: building a first communication link for a first object, and forwarding test information; and a test master station simulation result is collected and packaged into a first transmission message, and the first transmission message is input to the first communication link and is dispatched to the test terminal unit. And analyzing the first transmission message at the test terminal unit to obtain an analysis result. According to the remote virtual simulation method and system for the security and stability control system of the large power grid, the bandwidth utilization rate, the packet loss rate, the transmission delay and the reliability are comprehensively considered, and the high efficiency and the reliability of data transmission are ensured. The link state information can be periodically updated according to the change of the network state, and the path weight and the optimal path are recalculated, so that the flexibility and the adaptability of the system are improved, and the dynamic adjustment capability is realized. Moreover, unnecessary data transmission is reduced, and the test efficiency and the resource utilization rate are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid virtual simulation, and in particular to a remote virtual simulation method and system for a large power grid safety and stability control system. Background Art

[0002] In the power system, the safety and stability control system is characterized by a wide distribution area and many plants and stations. The logical functions of the safety and stability control devices at each site are complex, and the stability control strategies between plants and stations need to be coordinated and closely related. This characteristic brings great difficulties to the inspection, strategy inspection and transmission test of on-site devices. At present, there are some problems in the regular inspection and joint debugging of the safety and stability control system, such as a high overdue inspection rate and the risk of refusal to operate; there are deviations in the regular inspection and joint debugging process, the joint debugging scope is limited, the joint debugging efficiency is low, and the debugging data analysis and collation takes a long time. In addition, the test method mainly relies on single-body, point-to-point manual addition tests, which makes it difficult to fully verify the effectiveness of the strategy.

[0003] At present, systematic tests mainly rely on RTDS (real-time digital simulator). However, due to the limitation of the scale of the RTDS hardware platform, the simulation model needs to be processed equivalently, which causes the equivalent system to lose the dynamic characteristics of the original system, making it difficult for the test results to truly reflect the actual state of the system. With the rapid development of UHV AC / DC transmission technology and new energy power generation, the scale of the power grid system continues to expand, and the scale of the safety and stability control system also increases accordingly. The adaptability of the stability control strategy is difficult to verify through rolling tests. Therefore, there is an urgent need for a method that can conduct comprehensive, reliable and efficient testing of the power grid safety and stability control system, so as to discover and solve the software and hardware defects of the stability control device as early as possible, thereby avoiding hidden dangers to the safe and stable operation of the power grid.

[0004] Existing testing methods mainly rely on manual addition testing, which is mainly based on single-unit and point-to-point testing. The test efficiency is low and it is difficult to fully verify the coordination effect of the strategy. Although the systematic test uses RTDS, due to the limitations of its hardware platform, the simulation model must be processed with equivalent values, which will cause a large deviation between the simulation results and the actual situation. How to conduct effective, reliable and complete system testing on the huge and complex power grid safety and stability control system and timely expose the software and hardware defects of the stabilization device is an urgent problem to be solved. This has important practical significance for ensuring the safe and stable operation of the power grid. Summary of the invention

[0005] In view of the above-mentioned problems, the present invention is proposed.

[0006] Therefore, the technical problem solved by the present invention is that the existing test method mainly relies on manual addition test, which is mainly based on single-unit and point-to-point test, with low test efficiency and difficulty in fully verifying the coordination effect of the strategy. Although the systematic test uses RTDS, due to the limitation of its hardware platform, the simulation model must be processed by equivalent value, which will lead to a large deviation between the simulation results and the actual situation.

[0007] To solve the above technical problems, the present invention provides the following technical solutions: A remote virtual simulation method for a large power grid safety and stability control system, comprising: establishing a first communication link for a first object and forwarding test information.

[0008] The simulation results of the test master station are collected, encapsulated into a first transmission message, input into the first communication link, and distributed to the test terminal unit.

[0009] The first transmission message is parsed at the test terminal unit to obtain a parsing result.

[0010] As a preferred solution of the remote virtual simulation method of the large power grid safety and stability control system described in the present invention, the forwarding of test information includes forwarding messages and traffic containing test cases.

[0011] As a preferred scheme of the remote virtual simulation method of the large power grid safety and stability control system described in the present invention, wherein: the collection of simulation results of the test master station and encapsulation into a first transmission message includes collecting the switching quantity and analog quantity transient values ​​output by the simulation result output terminal of the test master station, and encapsulating the received switching quantity and analog quantity transient values ​​into the first transmission message.

[0012] As a preferred scheme of the remote virtual simulation method of the large power grid safety and stability control system described in the present invention, wherein: the parsing of the first transmission message at the test terminal unit includes, at the test terminal unit, parsing the first transmission message to obtain the transient values ​​of the switching quantity and the analog quantity, and sending the transient values ​​of the switching quantity and the analog quantity and the transient values ​​of the switching quantity and the analog quantity corresponding to the stabilization control device to the stabilization control device through the simulation signal receiving end.

[0013] As a preferred scheme of the remote virtual simulation method of the large power grid safety and stability control system described in the present invention, the analysis also includes, at the stabilization control device, executing the control strategy according to a predetermined strategy set, generating a second transmission message including control instructions, and transmitting the second transmission message to the test master station.

[0014] As a preferred solution of the remote virtual simulation method of the large power grid safety and stability control system described in the present invention, wherein: the first object includes but is not limited to the end-to-end gateway in the power grid.

[0015] The first communication link includes but is not limited to a transparent virtual communication link.

[0016] As a preferred solution of the remote virtual simulation method of the large power grid safety and stability control system described in the present invention, the test master station is connected to the test terminals distributed at various sites through a communication network, and the test terminals are connected to the stabilization control device through cables and optical fibers.

[0017] A remote virtual simulation system for a large power grid safety and stability control system, characterized by: comprising:

[0018] A communication link establishment module is used to establish a first communication link for the first object and forward test information.

[0019] The communication module collects the simulation results of the test main station, encapsulates them into a first transmission message, inputs them into the first communication link, and distributes them to the test terminal unit.

[0020] A parsing module is used to parse the first transmission message in the test terminal unit to obtain a parsing result.

[0021] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the above method when executing the computer program.

[0022] A computer-readable storage medium stores a computer program, which implements the steps of the method described above when executed by a processor.

[0023] Beneficial effects of the present invention: The present invention comprehensively considers bandwidth utilization, packet loss rate, transmission delay and reliability, ensuring the high efficiency and reliability of data transmission. According to the changes in network status, the link status information can be regularly updated, and the path weight and the optimal path can be recalculated, thereby improving the flexibility and adaptability of the system and having dynamic adjustment capabilities. Moreover, unnecessary data transmission is reduced, and the test efficiency and resource utilization are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing 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 creative work. Among them:

[0025] Figure 1 An overall flow chart of a remote virtual simulation method and system for a large power grid safety and stability control system provided in the first embodiment of the present invention.

[0026] Figure 2A hierarchical structure diagram of a remote virtual simulation method for a large power grid safety and stability control system and a stability control system of the system connected to a wide area power grid provided in the first embodiment of the present invention.

[0027] Figure 3 A second embodiment of the present invention provides a remote virtual simulation method for a large power grid safety and stability control system and a connection relationship and link status parameter diagram between each node of the system.

[0028] Figure 4 A second embodiment of the present invention provides a remote virtual simulation method for a large power grid safety and stability control system and a link status parameter value diagram of the system. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0030] Example 1, reference Figure 1 , Figure 2 , which is an embodiment of the present invention, provides a remote virtual simulation method for a large power grid security and stability control system, comprising:

[0031] S1: Establish a first communication link for a first object and forward test information.

[0032] In the present invention, the first object is an end-to-end gateway in a power grid, and the first communication link is a transparent virtual communication line.

[0033] The first object can also be a communication gateway between different production lines in a factory, a gateway in a traffic signal control system, and an equipment gateway in a building. The first communication link can also be a cross-regional virtual local area network (VLAN) established through cloud platform resources to achieve interconnection of devices in the two ends of the network. In addition, a fixed SIM card IP can also be used, and proprietary tunnel technology can be used to connect devices in the same network segment, such as the test master station 222, the test terminal 999, and the stabilization device 555. The communication link includes a dedicated communication network for the power system, such as an SDH (Synchronous Digital Hierarchy) interface.

[0034] In an optional embodiment, in the context of an intelligent manufacturing system, the first object is a communication gateway between different production lines in a factory. By establishing a transparent virtual communication link between the control equipment of each production line and the factory management system, real-time data transmission and monitoring of equipment across production lines can be achieved. The communication link can utilize existing cloud computing platform resources to connect devices distributed in different production lines through a cross-regional virtual local area network (VLAN). For example, the factory's test master station can be connected to the terminal equipment of each production line through industrial Ethernet or a dedicated communication protocol (such as ModbusTCP).

[0035] The process of establishing a communication link:

[0036] In a smart manufacturing environment, transparent virtual communication links are created through network devices or virtualization platforms to isolate and interconnect production line equipment in different areas.

[0037] Use cloud platform resources or network switches and VLAN technology to build a virtual private network to achieve communication between production line control equipment and factory management master station.

[0038] By setting up a dedicated communication protocol, the test information is transmitted from the test master station to the test terminals of each production line, and equipment status monitoring and fault detection are performed.

[0039] Furthermore, cross-regional VLAN connection is achieved through the cloud platform. After the test master station issues a test instruction on the cloud, it is transmitted to the test terminals of each production line through a transparent virtual link, ultimately achieving real-time monitoring and adjustment of the terminal equipment status.

[0040] In an optional embodiment, in the context of an intelligent transportation system, the first object is a gateway in a traffic signal control system, and the first communication link is used to transmit data between devices across traffic management areas. Through a transparent virtual link, signal light control units distributed at different intersections and a central traffic management system can be connected. In order to improve traffic efficiency, wireless communication technology (such as a 5G network) can also be used to establish a fast and stable communication link between signal control devices in different areas.

[0041] The process of establishing a communication link:

[0042] Using the city communication network or 5G private network, a virtual private communication link is established between different traffic signal control units through wireless network technology.

[0043] Through regular testing between the traffic control master station and the intersection signal light control unit, the operating data of the control equipment is collected, and the control strategy of the signal light is dynamically adjusted according to the traffic flow.

[0044] In the traffic control system, the test information is sent to the control unit of each intersection through a wireless transmission protocol (such as LTE or 5G), enabling remote real-time monitoring and automatic adjustment.

[0045] Furthermore, using 5G or dedicated wireless network technology, the instructions issued by the test master station are sent to each intersection signal light control unit through a virtual link. The information is forwarded through the signal control link and the status of the traffic light is adjusted after analysis.

[0046] In an optional embodiment, in the context of an intelligent building management system, the first object is a device gateway in a building, which is used to forward data from various systems in the building (such as air conditioning, lighting, power monitoring, etc.). By building a transparent virtual link, data sharing and linkage management between various devices in the building can be achieved. Each system in the building transmits test information to the building management center through a dedicated communication network (such as BACnet, KNX protocol, etc., a building automation system).

[0047] The process of establishing a communication link:

[0048] In the building equipment management system, existing local network technologies (such as BACnet, Modbus, etc.) are used to connect the intelligent devices (air conditioning, lighting, temperature control system, etc.) on each floor to the building management master station.

[0049] By setting up a transparent virtual link, the building management system and the equipment control system on each floor are connected to ensure real-time data transmission and monitoring.

[0050] Create a cloud device interface in the building management system, use VLAN technology to achieve secure interconnection of various devices in the building, and support sending test information through transparent virtual links.

[0051] Furthermore, the building management master station forwards the test information to the floor equipment control unit through a virtual link. After receiving the test instruction, the floor equipment performs corresponding operations (such as turning on and off the air conditioner, adjusting the lighting, etc.) after protocol analysis.

[0052] In the present invention, the test information is the message and flow containing the test case.

[0053] It should be noted that step S1 also includes using a fixed SIM card IP and using a proprietary tunnel technology to connect the interconnection of devices in the same network segment. The devices in the same network segment include a test master station and / or a test terminal and / or a stabilization control device.

[0054] S2: Collect the simulation results of the test master station, encapsulate them into a first transmission message, input them into the first communication link, and distribute them to the test terminal unit.

[0055] The switch quantity and analog quantity transient values ​​outputted by the test master station through its simulation result output terminal are collected, and the received switch quantity and analog quantity transient values ​​are encapsulated into a first transmission message. The first transmission message is dispatched to the test terminal unit through the simulation signal output terminal through a communication link (the communication link includes a dedicated communication network of the power system).

[0056] S3: Parse the first transmission message in the test terminal unit to obtain a parsing result.

[0057] At the test terminal unit, the first transmission message is parsed to obtain the transient values ​​of the switching quantity and the analog quantity, and the switching quantity and the transient values ​​of the analog quantity corresponding to the stabilizing and controlling device are sent to the stabilizing and controlling device through the simulation signal receiving end.

[0058] At the stabilization and control device, the control strategy is executed according to a predetermined strategy set to generate a second transmission message including control instructions. The stabilization and control device transmits the second transmission message to the test main station through the test terminal unit and the wide area communication system in turn, thereby realizing remote real-time closed-loop testing of the power system safety and stability control system.

[0059] The number of the test terminal units is N, and the N test terminal units are scattered in the power grid and installed in the substation or power plant of the power system. The stabilization control device includes N stations.

[0060] It should be noted that the simulation signal output end of the wide area communication system is respectively connected to N test terminal units, and the N test terminal units are connected to the stabilization control devices of the N stations one by one. Among them, the safety and stability control system includes a real-time test main station, a wide area communication system, a test terminal unit and a stabilization control device. The simulation result of the test main station is output to the signal input end of the wide area communication system, and the signal output end of the wide area communication system is connected to the simulation signal receiving end of the stabilization control device through the test terminal unit. The export signal sending end of the stabilization control device is connected to the export signal input end of the wide area communication system through the test terminal unit, and the export signal output end of the wide area communication system is connected to the export signal input end of the test main station.

[0061] like Figure 2As shown, the test master station is connected to the test terminals distributed at various sites through a communication network, and the test terminals are connected to the stabilization and control device through cables or optical fibers. The test master station 222 is connected to the test terminals 999 distributed at various sites through a communication network, and these test terminals 999 can be connected to the stabilization and control device 555 through cables or optical fibers. The number and location of the test terminals can be flexibly configured to meet the needs of different scenarios. Each test terminal unit 999 is installed in a substation or power plant of the power system, and corresponds to the corresponding stabilization and control device 555 one by one. The test master station 222 is responsible for obtaining the data source from the strategy verification simulation server, and the data source includes fault simulation results or fault recording files (.COMTRADE format). The test master station 222 downloads the data source to the test terminal 999 by wired and / or wireless means, and then the test terminal 999 transmits it to the stabilization and control device 555.

[0062] In some embodiments, the remote virtual simulation method for a large power grid wide-area safety and stability control system further includes a step of synchronously collecting data from a plurality of stabilization control devices 555, and the step of synchronously collecting data specifically includes the following sub-steps:

[0063] Sampling step: synchronously sampling the voltage and / or current of the power network at a preset sampling time interval to obtain sampling values.

[0064] Effective value calculation step: Based on the sampled values ​​obtained in the above sampling step, the full-wave effective value of the power network voltage and / or current is calculated.

[0065] Parameter calculation step: also based on the sampled values, calculate the fundamental wave parameters of the power network voltage and / or current.

[0066] Alignment step: align the sampling value, full-wave effective value, and fundamental wave parameters to the same time slice according to their respective timestamps and store them in the buffer.

[0067] Upload step: at the data upload time, retrieve the data in the time slice closest to the data upload time and containing the sampling value, full-wave effective value, and fundamental wave parameter from the buffer as the upload data, and upload it to the test master station 222. In this way, it can be ensured that the test master station 222 can accurately determine the specific data collection time of each collection point, so as to analyze the state of the power system at the same time slice.

[0068] Furthermore, in order to further improve the efficiency of communication collaboration, the method also includes using a concurrent multi-path transmission control method to dynamically construct a test path between the N stabilization devices 555. This four-way handshake synchronous communication sub-step can ensure the reliability and real-time performance of data transmission, while enhancing the flexibility of communication path planning. Specifically, the dynamic construction of the communication path includes the following steps:

[0069] Handshake mechanism: A handshake mechanism is added during the information transmission and reception process between the remote large-scale test terminal and the test master station, and the 103 protocol is used as the transmission protocol for the integrated power grid simulation data and the communication data of the mirror security control device.

[0070] Data analysis and correction: Data analysis and correction technology based on a large-capacity data buffer pool enables the dynamic simulation data of the test master station system to be downloaded to the remote test terminal in a relatively short time.

[0071] Wide-area synchronous triggering: Wide-area synchronous triggering technology is used to synchronously output the dynamic simulation data of the test master station system to the on-site security control device in a timely manner. In order to reduce the standard frequency error caused by insufficient clock signal accuracy, the B code time synchronization received by the 485 interface and the GPS / Beidou time synchronization module are combined to ensure the time synchronization accuracy of remote large-scale test terminals.

[0072] In order to solve the problem of insufficient information and missing absolute timestamps, this method further includes a timestamp synchronization mechanism. By automatically comparing the action results of the stabilization and control device in a closed loop and automatically generating a test report, a dynamic whole-group simulation closed-loop test of a cross-regional and multi-plant safety and stability control device is finally realized. In addition, by replaying the waveform of the fault recording file, accident inversion can also be achieved to help analyze the state changes of the power system. The specific steps include the following:

[0073] Action result comparison: The main station of the stability control simulation test sets the action result comparison template, and ensures that the simulation start time of the real-time simulation device and the test main station are always consistent through high-precision timestamps. The action signal of the security control device is loaded into the real-time simulation device, and the device action signal parsing model is used to convert the action signal of the security control device into a digital signal that can be recognized by the real-time simulation model of the power grid, and the node is loaded according to the automatic positioning of the dynamic simulation process of the power grid. Through synchronous data acquisition and timestamp alignment, the integrity and consistency of the test data are ensured, and the credibility of the test results is improved.

[0074] Waveform playback: Play back the action information of the security and control device according to the sampling requirements of the real-time simulation and the integrated action sequence of the security and control device. According to the verification requirements of the fault scenario and the communication efficiency requirements, intercept the normal operation of the power grid and the dynamic simulation data of the power grid including the switching of the operation mode, data communication failure, and equipment failure. Considering the data flow characteristics of the real-time simulation equipment and the information flow characteristics of the security and control device in a specific scenario, the action signal of the security and control device is loaded into the real-time simulation equipment. The real-time simulation equipment transmits the signal to the security and control device based on the high-precision dynamic simulation data synchronization trigger technology, records the action results of the security and control device and compares them with the information description rules of the action behavior of the security and control system, and realizes the closed-loop inversion of the remote large-scale security and control devices in operation.

[0075] Through the joint closed-loop test, the coordination between all the stabilization devices 555 and the test terminal 999 is ensured, and comprehensive test coverage is achieved. In addition, through the waveform playback of the fault recording file, the accident inversion can be realized, which helps to analyze the state changes of the power system and improves the accuracy of fault diagnosis.

[0076] The above embodiments also include a remote virtual simulation system for a large power grid safety and stability control system, specifically:

[0077] A communication link establishment module is used to establish a first communication link for the first object and forward test information.

[0078] The communication module collects the simulation results of the test master station, encapsulates them into a first transmission message, inputs them into the first communication link, and distributes them to the test terminal unit.

[0079] The parsing module parses the first transmission message in the test terminal unit to obtain a parsing result.

[0080] The computer device may be a server. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. The processor, the memory and the input / output interface are connected via a system bus, and the communication interface is connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data cluster data of the power monitoring system. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a remote virtual simulation method for a large power grid security and stability control system is implemented.

[0081] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but are not limited to this.

[0082] Example 2, reference Figure 3 , Figure 4 , which is an embodiment of the present invention, provides a remote virtual simulation method and system for a large power grid safety and stability control system. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through simulation experiments.

[0083] Assume that we have a large power grid wide area safety and stability control system, and need to optimize the communication paths between multiple stability control devices 555. The following are specific steps and application examples of the technical solution.

[0084] Figure 3 This is a simplified network diagram for this application scenario that includes five nodes (A, B, C, D, E). It shows the connection relationship and link status parameters between each node.

[0085] exist Figure 3 In the example, node A is connected to B and C. Node B is connected to A, D, and C. Node C is connected to A, B, D, and E. Node D is connected to B, C, and E. Node E is connected to C and D.

[0086] Nodes A, B, C, D, and E represent different substations or power plants.

[0087] Edge: represents the connection between nodes. The number marked on the edge represents the transmission delay of the link (milliseconds).

[0088] The following are the specific status parameters for each link:

[0089] AB:

[0090] Transmission delay D AB =10ms, bandwidth utilization B AB =0.8, packet loss rate L AB =0.01, reliability R AB =0.9.

[0091] AC:

[0092] Transmission delay D AC =20ms, bandwidth utilization B AC =0.6, packet loss rate L AC =0.02, reliability R AC =0.8.

[0093] BD:

[0094] Transmission delay D BD =15ms, bandwidth utilization B BD =0.7, packet loss rate L BD =0.03, reliability R BD =0.85.

[0095] CD:

[0096] Transmission delay D CD =25ms, bandwidth utilization B CD =0.5, packet loss rate L CD =0.04, reliability R CD =0.75.

[0097] CE:

[0098] Transmission delay D CE =18ms, bandwidth utilization B CE =0.6, packet loss rate L CE =0.03, reliability R CE =0.8.

[0099] DE:

[0100] Transmission delay D DE =22ms, bandwidth utilization B DE =0.5, packet loss rate L DE =0.02, reliability R DE =0.7.

[0101] Network topology: A simplified network consisting of 5 nodes (A, B, C, D, E), each node represents a substation or power plant.

[0102] Link state parameters:

[0103] Bandwidth utilization B ij : Bandwidth utilization of link (i, j) (between 0 and 1).

[0104] Packet loss rate L ij : Packet loss rate of link (i,j) (between 0 and 1).

[0105] Transmission delay D ij : Transmission delay of link (i, j) (milliseconds).

[0106] Reliability ij : The reliability of link (i, j) (between 0 and 1).

[0107] Assumptions Figure 4 The link state parameter value is used to calculate the path weight. According to the path selection formula in the link, the path selection weight W ij It is expressed as:

[0108]

[0109] Substitute the above link state parameter values ​​for calculation:

[0110]

[0111] Determine the optimal path:

[0112] Suppose we need to select an optimal path from node A to node E. Based on the calculated path weight, we can consider all possible paths and their total weight W total .

[0113] ABDE:W total =W AB +W BD +W DE ≈0.0719+0.0402+0.0159=0.128.

[0114] BACDE: W total =W AC +W CD +W=≈0.0239+0.0149+0.0159=0.0547.

[0115] CACE: W total =W AC +W CE ≈0.0239+0.0266=0.0505.

[0116] Comparing the total weights of the three paths, path ACE has the smallest total weight and is therefore the optimal path.

[0117] Through the analysis and calculation of various possible paths by the above methods and steps, it can be seen that the path planning technical solution has the following technical effects compared with the prior art:

[0118] Efficient data transmission: By comprehensively considering bandwidth utilization, packet loss rate, transmission delay and reliability, the optimal path ACE is selected to ensure efficient and reliable data transmission.

[0119] Dynamic adjustment capability: If the network status changes, the link status information can be updated regularly, and the path weight and optimal path can be recalculated, which improves the flexibility and adaptability of the system.

[0120] Reduce unnecessary data transmission: By optimizing path selection, unnecessary data transmission is reduced, improving test efficiency and resource utilization.

[0121] In summary, through specific application scenarios and numerical calculations, the advantages of the path planning technology solution in practical applications are demonstrated. This solution can not only effectively select the optimal path to ensure the efficiency and reliability of data transmission, but also dynamically adjust the path to improve the flexibility and adaptability of the system. This technical solution has important application value in the remote virtual simulation of the wide-area safety and stability control system of large power grids.

[0122] Through the above comparative analysis, it can be seen that the technical solution in the embodiments of the present application has obvious advantages in path planning, can more effectively select the optimal path, and improve the efficiency and reliability of data transmission.

[0123] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the 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 remote virtual simulation method for a large power grid safety and stability control system, characterized in that: include: Establishing a first communication link for the first object and forwarding test information; Collecting simulation results of the test master station, encapsulating them into a first transmission message, inputting them into the first communication link, and dispatching them to the test terminal unit; The first transmission message is parsed at the test terminal unit to obtain a parsing result.

2. The remote virtual simulation method for a large power grid safety and stability control system according to claim 1, characterized in that: The forwarding test information includes forwarding messages and traffic containing test cases.

3. The remote virtual simulation method for a large power grid safety and stability control system according to claim 2, characterized in that: The collecting and testing the simulation results of the main station and encapsulating them into a first transmission message include: The switch quantity and analog quantity transient value outputted by the test master station through the simulation result output terminal are collected, and the received switch quantity and analog quantity transient value are encapsulated into a first transmission message.

4. The remote virtual simulation method for a large power grid safety and stability control system according to claim 3 is characterized in that: Parsing the first transmission message in the test terminal unit includes, at the test terminal unit, parsing the first transmission message to obtain transient values ​​of switching quantities and analog quantities, and sending the transient values ​​of switching quantities and analog quantities and the transient values ​​of switching quantities and analog quantities corresponding to the stabilizing control device to the stabilizing control device through a simulation signal receiving end.

5. The remote virtual simulation method for a large power grid safety and stability control system according to claim 4, characterized in that: The analysis also includes, at the stabilization control device, executing a control strategy according to a predetermined strategy set, generating a second transmission message including a control instruction, and transmitting the second transmission message to the test master station.

6. The remote virtual simulation method for a large power grid safety and stability control system according to claim 5, characterized in that: The first object includes but is not limited to an end-to-end gateway in a power grid; The first communication link includes but is not limited to a transparent virtual communication link.

7. The remote virtual simulation method for a large power grid safety and stability control system according to claim 6, characterized in that: The test main station is connected to the test terminals distributed at various sites through a communication network, and the test terminals are connected to the stabilization and control device through cables and optical fibers.

8. A remote virtual simulation system for a large power grid safety and stability control system using the method according to any one of claims 1 to 7, characterized in that: Establishing a communication link module, establishing a first communication link for the first object, and forwarding test information; The communication module collects the simulation results of the test master station, encapsulates them into a first transmission message, inputs them into the first communication link, and distributes them to the test terminal unit; A parsing module is used to parse the first transmission message in the test terminal unit to obtain a parsing result.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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