Method and device for field testing of flexible direct current protection

Abstract

The application discloses a flexible direct current protection field test method, comprising the following steps: based on adaptive decoding technology, combining the actual sampling data of the measurement unit engineering field, and constructing a sampling signal model of the measurement unit; according to the mapping relationship between the flexible direct current control and protection in the engineering field, and the corresponding transmission information, a coupling model of the flexible direct current control and protection is constructed; the virtual terminal connection of the sampling signal model and the coupling model is established, and a first terminal state flexible direct current protection test model is constructed; based on the flexible direct current protection test model, the corresponding test items of the flexible direct current protection are completed. After the private sampling value of the flexible converter station, the private interaction data model between the control and the protection are modeled, the direct current protection can be decoupled from the converter station; the virtual terminal connection between the constructed models is established, and the corresponding test items of the flexible direct current protection are completed, thereby breaking through the laboratory limitation and increasing the universality of the flexible direct current protection test technical means.

Description

Technical Field

[0001] This application relates to the field of flexible DC transmission technology, and more specifically, to a flexible DC protection field testing method and equipment. Background Technology

[0002] As the brain of flexible DC transmission projects, flexible DC control and protection currently relies mainly on laboratory-based hybrid simulation systems to establish testing environments and verify their functionality and performance. However, effective field testing remains difficult due to limitations such as diverse measurement unit types, inconsistent transmission methods, proprietary transmission protocols, and deep coupling between control and protection. Considering that DC control and protection equipment, unlike mature AC control and protection technologies, still faces the objective need for frequent program logic upgrades after commissioning, the lack of effective field testing techniques poses a significant threat to the safe and stable operation of flexible DC transmission projects and even the entire power grid.

[0003] Therefore, it is urgent to study on-site testing methods for flexible DC protection, to provide practical means for on-site testing of the functional performance of flexible DC protection, and to ensure the safe and stable operation of flexible DC transmission projects and even the large power grid. Summary of the Invention

[0004] In response to at least one defect or improvement requirement of the prior art, this application provides a flexible DC protection field testing method and equipment, which solves the technical problems of lack of field testing means, poor field testing effect, poor operability and poor versatility of current flexible DC protection equipment.

[0005] To achieve the above objectives, in a first aspect, this application provides a field testing method for flexible DC protection, comprising:

[0006] Based on adaptive decoding technology, and combined with actual sampling data from the measurement unit engineering site, a sampling signal model of the measurement unit is constructed.

[0007] Based on the mapping relationship between flexible DC control and protection in the engineering site, and the corresponding transmission information, a coupled model of flexible DC control and protection is constructed.

[0008] Establish virtual terminal connections between the sampling signal model of the measurement unit and the coupling model of the flexible DC control and protection, and construct a flexible DC protection test model in the first final state;

[0009] Based on the flexible DC protection test model in the first final state, the corresponding test items for flexible DC protection are completed.

[0010] Furthermore, it also includes:

[0011] The test results of flexible DC protection are comprehensively judged by the action information between flexible DC protection and control and the output information of the three-out-of-two protection device.

[0012] Furthermore, the adaptive decoding technology includes:

[0013] The signal transmission method is determined by the clock signal that accompanies the signal transmission process;

[0014] Obtain the transmission baud rate of the signal and confirm that the baud rate is stable;

[0015] The corresponding link layer transmission threshold is obtained from the signal transmission baud rate, and the link layer transmission parsing is completed.

[0016] Obtain the protocol type parameters from the application layer data, and determine the message type and data attributes of the application layer using the actual sampling data from the engineering site of the measurement unit.

[0017] Furthermore, it also includes:

[0018] The analog output model of the tester is generated after defining the external output ports of the tester.

[0019] Establish virtual terminal connections for the sampling signal model of the measurement unit, the coupling model of the flexible DC control and protection, and the analog output model of the test instrument, and construct a flexible DC protection test model in the second final state;

[0020] Based on the flexible DC protection test model of the second final state, the corresponding test items of flexible DC protection are completed.

[0021] Furthermore, the adaptive decoding technology also includes:

[0022] A dynamic caching mechanism is used to manage the storage and interaction process of received data.

[0023] Furthermore, the construction of the coupled model for flexible DC control and protection based on the mapping relationship between flexible DC control and protection at the engineering site, and the corresponding transmission information, includes:

[0024] The control bus for interaction between flexible DC protection and control adopts a GOOSE-like transmission mode; the link layer of Ethernet packets has a fixed format, and the link layer information is obtained by reading the packets. The application layer information in the packets is generated based on the mapping relationship between flexible DC control and protection; thus, flexible DC protection models and flexible DC control models are constructed respectively.

[0025] The flexible DC protection model and the flexible DC control model are coupled to construct the coupled model of flexible DC control and protection.

[0026] Furthermore, the virtual terminal connection of establishing the sampling signal model of the measurement unit and the coupling model of the flexible DC control and protection, and constructing the flexible DC protection test model in the first final state, includes:

[0027] Using the graphical tools of the host computer of the test instrument, based on the connection relationship of the measurement interface at the engineering site and the connection relationship between flexible DC control and protection, the sampling signal model of the measurement unit and the coupling model of flexible DC control and protection are connected as virtual terminals to construct the first final state flexible DC protection test model.

[0028] Furthermore, the flexible DC protection test model based on the first final state completes the corresponding test items for flexible DC protection, including:

[0029] Based on the flexible DC protection test model of the first final state, corresponding script files are created according to the data names;

[0030] The corresponding script file is executed to automatically generate the relevant test data and complete the corresponding test items for flexible DC protection.

[0031] Furthermore, the comprehensive judgment of the test results of the flexible DC protection based on the action information between the flexible DC protection and control, as well as the output information of the three-out-of-two protection device, includes:

[0032] Based on the action information sent to the control system by the flexible DC protection and the tripping information of the three-out-of-two protection device, a comprehensive judgment is made as to whether the action behavior of the flexible DC protection is correct.

[0033] Based on the time difference between the fault transmission time and the return time of the action information, as well as the time difference between the fault transmission time and the switch action time, the control response time of the flexible DC protection and the action time of the trip switch are obtained.

[0034] Secondly, this application provides an electronic device including at least one processing unit and at least one storage unit, wherein the storage unit stores a computer program that, when executed by the processing unit, enables the processing unit to perform the steps of any of the aforementioned test methods.

[0035] In summary, compared with the prior art, the above-described technical solutions conceived in this application can achieve the following beneficial effects:

[0036] (1) This application models the privatized sampling values ​​and privatized interactive data between control and protection of the flexible converter station, thereby decoupling the DC protection from the converter station. Then, virtual terminal connections are established between the constructed models, and corresponding test items for the flexible DC protection can be completed based on the connected models. The model-based decoupling flexible DC protection field testing method proposed in this application can conduct comprehensive testing of the functional performance of flexible DC protection at the flexible DC transmission project site, breaking through the current limitation that flexible DC protection testing can only be carried out in the laboratory using a hybrid numerical simulation system, and increasing the versatility of flexible DC protection testing techniques.

[0037] (2) This application can make a comprehensive judgment on the test results of flexible DC protection by using the action information between flexible DC protection and control and the output information of the three-out-of-two protection device, and complete the analysis of DC protection action behavior, so as to more accurately grasp the DC protection action behavior and improve the safety of flexible DC protection.

[0038] (3) This application realizes the adaptive decoding function of digital sampling by adopting adaptive decoding technology, which solves the problem of poor universality of test methods caused by different manufacturers or equipment models, and meets the on-site test requirements of DC protection for different flexible DC transmission projects.

[0039] (4) In order to protect the integrated design of the test, this application also modeled the analog output, so that the digital and analog quantities can be implemented using the same model. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 A core flowchart of a field testing method for flexible DC protection provided in this application embodiment;

[0042] Figure 2 This is a schematic diagram of the field test wiring for flexible DC protection provided in an embodiment of this application;

[0043] Figure 3 This application provides an architecture diagram of an integrated DC control and protection test system for multi-source data wireless transmission.

[0044] Figure 4 This application provides a schematic diagram illustrating the principle of adaptive decoding of a sampling signal model in an embodiment of the present application.

[0045] Figure 5 A block diagram illustrating an electronic device suitable for implementing the test method described above, provided in an embodiment of this application. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. Furthermore, the technical features involved in the various embodiments described below can be combined with each other as long as they do not conflict with each other.

[0047] The terms "first," "second," or "nth," etc., used in the specification, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a particular order. Furthermore, the terms "comprising" or "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such processes, methods, products, or apparatus.

[0048] Current laboratory-based methods for testing flexible DC protection require auxiliary equipment such as merging units, converter valve control devices, and interface devices that are identical to those used in field testing. Due to differences in manufacturers, this equipment is often not universally compatible and cannot meet the DC protection testing needs of various flexible DC transmission projects. Furthermore, laboratory-based methods rely on simulation systems, typically requiring large-scale real-time simulation systems like RTDS to ensure testing efficiency. This limits traditional techniques to on-site testing, restricting the testing environment to the laboratory. Therefore, this application proposes a field testing method and equipment for flexible DC protection, addressing the current technical problems of lacking on-site testing methods, poor on-site testing results, poor operability, and poor versatility in flexible DC protection equipment.

[0049] refer to Figure 2In some embodiments, this application adopts an integrated design architecture. The power amplifier on the DC protection test host (tester) is responsible for simulating the analog current and voltage signals on the AC side and the secondary voltage signal output by the DC voltage divider; the DA conversion module is responsible for outputting small voltage signals, analog signals, and special signals such as zero-flux current transformers; the fiber optic Ethernet interface is connected to the DC control and protection process bus network to realize communication with DC protection and control; the I / O module receives and outputs switch information; the FT3 receiving module receives digital information from the DC electronic current transformer merging unit, and the FT3 transmitting module simulates the digital signals of the DC electronic current transformer merging unit to send data to the DC protection equipment (DC protection device). The host computer of the tester is responsible for establishing the corresponding test model and completing the configuration of test data and human-computer interaction. The three-out-of-two protection device is an electrical protection device, mainly including three protection functions: current protection, voltage protection, and differential protection, used to protect electrical equipment in the power system from the influence of electrical faults. The function of the three-out-of-two protection device is to detect possible faults between the power supply end and the load end in the power system, cut off the circuit in time, prevent the circuit from continuing to work, avoid damage to electrical equipment, and avoid affecting the normal operation of the power system.

[0050] refer to Figure 3 In some embodiments, this application employs a dual-CPU architecture design of FPGA+MPC, which can realize data output and reception of multiple protocols and formats within a single device. The MPC8247 is a microprocessor that supports frequencies from 266-400MHz.

[0051] refer to Figure 1 In some embodiments, based on Figure 2 and Figure 3 A flexible DC protection field test method designed based on the hardware architecture may include the following steps.

[0052] Step 1: Generation of the sampled value model (i.e., the sampled signal model of the measurement unit). Based on adaptive decoding technology and combined with the actual sampled data from the measurement unit's engineering site, the sampled signal model of the measurement unit is constructed.

[0053] In some embodiments, specifically, since the output of flexible DC electronic instrument transformers is basically based on the FT3 protocol (referring to the IEC 60044-8 protocol. This protocol is mainly used for data communication of all-fiber current transformers to ensure that the current transformer can effectively exchange and communicate with other devices), there are two sampling rates: 10kHz and 50kHz. The 10kHz sampling value protocol is basically defined, but the specific data definition is not yet clear. The 50kHz sampling value output protocol has a high degree of privatization, so on-site joint debugging is required. At this time, FT3 adaptive sampling technology is designed to analyze FT3 data, establish protocol and data models, import the sampling value Excel file of the DC electronic instrument transformer on site (pre-prepared project file), then read the sampling value of the DC electronic instrument transformer and finally generate the sampling value XML file, i.e., the sampling value mu.icd file.

[0054] An ICD file, or IEC 61850 ICD file, is a file format used to describe the capabilities of intelligent electronic devices (IEDs). This file is written in XML format with the ".icd" extension and is primarily used to describe the device's specifications, including communication parameters, data models, and services.

[0055] Flexible DC sampling value transmission is based on the IEC 60044-8 serial transmission protocol (i.e., the FT3 protocol. The link layer in the IEC 60044-8 standard is selected as the FT3 format of IEC 60870-5-1. The standard transmission speed of the general frame is 10 Mbit / s (data clock), using Manchester encoding, and transmitting the MSB (most significant bit) first. Different manufacturers or models may have differences in sampling frequency, encoding method, transmission baud rate, and dataset length, which is a key issue that DC control and protection testing equipment needs to address.

[0056] like Figure 4 As shown, to achieve adaptive decoding of digital sampling, hardware decoding of the original signal's data layer needs to be performed using an FPGA. Corresponding processing measures are taken at the physical layer, link layer, and application layer of the transmission protocol. Specific steps may include:

[0057] (1) Encoding method determination

[0058] Based on the difference in encoding principles between Manchester encoding (synchronous mode) and TTL encoding (asynchronous mode), the clock signal accompanying the signal transmission process is used to determine whether the signal transmission mode is synchronous or asynchronous.

[0059] (2) Baud rate determination

[0060] The transmission duration of data bits is determined by the transmission baud rate. Different data baud rates correspond to different link layer parsing parameters, so it is necessary to accurately obtain the transmission baud rate of the original signal.

[0061] Continuously acquire the displacement period of the original signal T bc The data baud rate is determined by the minimum shift period value, and then the baud rate stability is tested to determine the baud rate of the message.

[0062] (3) Link layer transmission

[0063] The corresponding link-layer transmission threshold is calculated from the transmission baud rate of the original signal to complete the link-layer transmission resolution. The FT3 protocol transmission link includes three fixed areas: start symbol, data block, and CRC checksum. It is independent of the protocol type and can use a unified link resolution mechanism.

[0064] The link transmission begins with the specified data start character, receives data blocks in fixed byte increments, inserts a CRC checksum at the end of each data block, and terminates the current link transmission when the maximum number of received data blocks is reached and the corresponding block CRC checksum has been received. It then returns a start character to wait for the next transmission.

[0065] (4) Application layer parsing and verification

[0066] Generally, the data sets transmitted by different manufacturers using the FT3 protocol have different contents. In order to achieve automatic identification, it is necessary to obtain the "protocol type" parameter in the application layer data (in DC engineering, this parameter is generally located in the first and second bytes of the data set). By using the sampled value Excel file imported in advance, the message type and data attributes of the application layer can be determined. Data channels not in the Excel file are treated as empty channels.

[0067] (5) Adaptive sampling frequency

[0068] To adapt to different sampling frequencies of the FT3 protocol, a dynamic caching mechanism can be used to manage the storage and interaction of received data.

[0069] This application adopts adaptive decoding technology to realize the adaptive decoding function of digital sampling, which solves the problem of poor universality of test methods caused by different manufacturers or equipment models, and meets the on-site test requirements of DC protection for different flexible DC transmission projects.

[0070] Step 2: Generation of the control and protection bus model (i.e., the coupled model of flexible DC control and protection). Based on the mapping relationship between flexible DC control and protection in the engineering field, and the corresponding transmission information, a coupled model of flexible DC control and protection is constructed.

[0071] The field testing of DC protection differs from that of AC protection. DC control and protection are more deeply coupled, while AC protection lacks this coupling. Therefore, traditional AC protection methods are unsuitable for DC protection. In some embodiments, the control bus for interaction between flexible DC protection and control uses 100Mbps fiber optic Ethernet and a GOOSE-like transmission mode (GOOSE transmission mode is primarily based on the IEC 61850 standard, employing Ethernet virtual LAN and traffic prioritization technology. Its packets contain a priority / virtual LAN identifier field defined by VLAN tags, used to prioritize the transmission of packets with high reliability, real-time requirements, and high priority, or to separate them from other network traffic). The mapping relationships between control and protection are only represented by an Excel file (a pre-prepared project file). The Ethernet packet link layer has a fixed format; link layer information is obtained by reading the packets, and application layer information in the packets is generated from the imported mapping relationship Excel file. Therefore, XML model (flexible DC protection model) files for protection (i.e. DC protection device) are created, namely relay.icd; and XML model (flexible DC control model) files for control (i.e. DC control host) are created, namely control.icd.

[0072] The flexible DC protection model and the flexible DC control model are coupled to construct a coupled model of flexible DC control and protection.

[0073] Step 3: Generation of the external analog quantity model (i.e., the analog quantity output model of the tester).

[0074] The external analog signal is determined by the hardware capabilities of the tester, as analog signal transmission is determined by wiring. Therefore, preferably, the tester's XML model (i.e., the tester's analog output model) file text.icd is generated after defining the external output ports of the tester.

[0075] To protect the integrated design of the test, this application also models the analog output, so that digital and analog signals can be implemented using the same model.

[0076] Step 4: Test the virtual terminal connection.

[0077] The graphical tools on the host computer of the test instrument are used to establish the connection relationships of the external signals (i.e., the aforementioned sampling value model and control protection bus model) required for on-site testing of flexible DC protection projects. At this time, the test personnel no longer need to worry about the test model and digital messages, thus facilitating the user's operation.

[0078] Using the graphical tools of the host computer of the flexible DC protection engineering field test instrument, based on the actual port connection relationship of the flexible DC protection equipment at the engineering site (the connection relationship of the measurement interface, the connection relationship between flexible DC control and protection), the flexible DC protection model file relay.icd, the flexible DC control model file control.icd, the electronic transformer sampling value model file mu.icd, and the analog output model file text.icd of the test instrument are connected together to establish the final flexible DC protection test model ICD file.

[0079] The aforementioned models are inheritable; flexible DC converter stations with the same protocol can be obtained simply by changing the on-site engineering data and connection relationships.

[0080] Step 5: Implement automatic on-site testing of flexible DC protection using script files.

[0081] In some embodiments, specifically, the host computer of the flexible DC protection field tester reads the aforementioned final flexible DC protection test model ICD file and generates test output channels, a mapping matrix for flexible DC control and protection, and a switch quantity return channel, which serve as parameter configuration functions and test result judgment functions for flexible DC protection field testing.

[0082] More specifically, after the host computer reads the aforementioned final flexible DC protection test model ICD file, it generates test output interfaces (DC sampling values, AC sampling values, special sampling channels, and switch output channels), a control-to-protection mapping matrix interface (these interfaces are the output parameter configuration interfaces for protection testing), and a protection-to-control mapping matrix interface and a switch return interface (these interfaces are the test interfaces after protection action).

[0083] Test data can be configured manually (configuring AC / DC side current and voltage quasi-stable state data, switching information, control-to-protection information, and state sequences) or dynamically generated via test script files (automatically generating the required test data according to the flexible DC protection logic). Then, based on the test data, the corresponding test items for the flexible DC protection are completed.

[0084] This application achieves automatic testing through script files. After modeling, the mapping and logical relationship between data have been completed. At this point, it is only necessary to create the corresponding script file according to the data name, and the test instrument software can execute the script file to realize the automatic testing of flexible DC protection in the field.

[0085] This application models the privatized sampled values ​​and privatized interactive data between control and protection in flexible converter stations, thereby decoupling DC protection from the converter station. By modeling the privatized protocol, DC protection is decoupled, eliminating the need for extensive protocol integration and debugging. Virtual terminal connections are established between the constructed models, and corresponding test items for flexible DC protection can be completed based on these connected models. This model-based decoupling method for on-site testing of flexible DC protection proposed in this application allows for comprehensive testing of the functional performance of flexible DC protection in flexible DC transmission projects. It overcomes the current limitation that flexible DC protection testing can only be conducted in laboratories using hybrid simulation systems, increasing the versatility of flexible DC protection testing techniques.

[0086] Step 6: Preferably, the DC protection action behavior is analyzed. The test results of the flexible DC protection are comprehensively judged based on the action information between the flexible DC protection and control, as well as the output information of the three-out-of-two protection device.

[0087] In some embodiments, specifically, the tester receives action information sent to the control system by the flexible DC protection from the fiber optic Ethernet data of the protection system, as well as the switching trip information of the three-out-of-two protection device, to comprehensively determine whether the action behavior of the flexible DC protection is correct.

[0088] Based on the time difference between the fault transmission time and the return time of the action information, as well as the time difference between the fault transmission time and the switch action time, the control response time of the flexible DC protection and the action time of the trip switch are obtained.

[0089] This application uses the action information between flexible DC protection and control, as well as the output information of the three-out-of-two protection device, to comprehensively judge the test results of flexible DC protection, complete the analysis of DC protection action behavior, thereby enabling a more precise understanding of DC protection action behavior and improving the safety of flexible DC protection.

[0090] Figure 5 A block diagram schematically illustrates an electronic device suitable for implementing the test methods described above, according to an embodiment of this application. Figure 5 The electronic device shown is merely an example and should not be construed as limiting the functionality and scope of the embodiments of this application.

[0091] like Figure 5As shown, the electronic device 1000 described in this embodiment includes a processor 1001, which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage portion 1008 into a random access memory (RAM) 1003. The processor 1001 may include, for example, a general-purpose microprocessor (e.g., a CPU), an instruction set processor and / or an associated chipset and / or a special-purpose microprocessor (e.g., an application-specific integrated circuit (ASIC)), etc. The processor 1001 may also include onboard memory for caching purposes. The processor 1001 may include a single processing unit or multiple processing units for performing different actions of the test method flow according to embodiments of this application.

[0092] RAM 1003 stores various programs and data required for the operation of electronic device 1000. Processor 1001, ROM 1002, and RAM 1003 are interconnected via bus 1004. Processor 1001 executes various operations of the test method flow according to embodiments of this application by executing programs in ROM 1002 and / or RAM 1003. It should be noted that the programs may also be stored in one or more memories other than ROM 1002 and RAM 1003. Processor 1001 may also execute various operations of the test method flow according to embodiments of this application by executing programs stored in said one or more memories.

[0093] According to embodiments of this application, the electronic device 1000 may further include an input / output (I / O) interface 1005, which is also connected to a bus 1004. The electronic device 1000 may also include one or more of the following components connected to the I / O interface 1005: an input section 1006 including a keyboard, mouse, etc.; an output section 1007 including a cathode ray tube (CRT), liquid crystal display (LCD), etc., and a speaker, etc.; a storage section 1008 including a hard disk, etc.; and a communication section 1009 including a network interface card such as a LAN card, modem, etc. The communication section 1009 performs communication processing via a network such as the Internet. A drive 1010 is also connected to the I / O interface 1005 as needed. A removable medium 1011, such as a disk, optical disk, magneto-optical disk, semiconductor memory, etc., is installed on the drive 1010 as needed so that computer programs read from it can be installed into the storage section 1008 as needed.

[0094] The test method flow according to the embodiments of this application can be implemented as a computer software program. For example, embodiments of this application include a computer program product comprising a computer program carried on a computer-readable storage medium, the computer program containing program code for performing the test method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network via communication section 1009, and / or installed from removable medium 1011. When the computer program is executed by processor 1001, it performs the functions defined in the system of the embodiments of this application. According to embodiments of this application, the systems, devices, apparatuses, modules and / or units described above can be implemented by computer program modules.

[0095] Embodiments of this application also provide a computer-readable storage medium, which may be included in the device / apparatus / system described in the above embodiments, or it may exist independently without being assembled into the device / apparatus / system. The computer-readable storage medium carries one or more programs, which, when executed, can implement the steps of the test method according to the embodiments of this application.

[0096] According to embodiments of this application, the computer-readable storage medium may be a non-volatile computer-readable storage medium, such as including but not limited to: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In embodiments of this application, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, apparatus, or device. For example, according to embodiments of this application, the computer-readable storage medium may include one or more memories other than the ROM 1002 and / or RAM 1003 described above.

[0097] It should be noted that the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product.

[0098] The flowcharts and / or block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in the flowcharts and / or block diagrams may represent a module, segment, or portion of code containing one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. Furthermore, it should be noted that each block in the block diagram or flowchart, and combinations of blocks in the block diagram or flowchart, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0099] Those skilled in the art will understand that the features described in the various embodiments and / or claims of this application can be combined and / or combined in various ways, even if such combinations or combinations are not explicitly described in this application. In particular, without departing from the spirit and teachings of this application, the technical features described in the various embodiments and / or claims of this application can be combined and / or combined in various ways, and all such combinations and / or combinations fall within the scope of this application.

[0100] Although this application has been shown and described with reference to specific exemplary embodiments thereof, those skilled in the art will understand that various changes in form and detail may be made to this application without departing from the spirit and scope of the application as defined by the appended claims and their equivalents. Therefore, the scope of this application should not be limited to the above embodiments, but should be determined not only by the appended claims, but also by their equivalents.

Claims

1. A field testing method for flexible DC protection, characterized in that, include: Based on adaptive decoding technology and combined with actual sampling data from the engineering site, a sampling signal model is constructed. The adaptive decoding technology includes: The signal transmission method is determined by the clock signal that accompanies the signal transmission process; Obtain the transmission baud rate of the signal and confirm that the baud rate is stable; The corresponding link layer transmission threshold is obtained from the signal transmission baud rate, and the link layer transmission parsing is completed. Obtain the protocol type parameters from the application layer data, and determine the message type and data attributes of the application layer by using actual sampled data from the engineering site; Based on the mapping relationship between flexible DC control and protection at the engineering site, and the corresponding transmission information, a coupled model of flexible DC control and protection is constructed, specifically including: The control bus for interaction between flexible DC protection and control adopts a GOOSE-like transmission mode. There are only Excel files with mapping relationships between control and protection, and between protection and control. The link layer of Ethernet packets has a fixed format. The link layer information is obtained by reading the packets. The application layer information in the packets is generated by the imported mapping relationship Excel file. Thus, flexible DC protection model and flexible DC control model are constructed respectively. The flexible DC protection model and the flexible DC control model are coupled to construct the coupled model of flexible DC control and protection; Establish virtual terminal connections between the sampling signal model and the coupling model to construct a flexible DC protection test model in the first final state, specifically including: Using the graphical tools of the host computer of the test instrument, based on the connection relationship of the measurement interface at the engineering site and the connection relationship between flexible DC control and protection, the sampling signal model and the coupling model are connected as virtual terminals to construct the first final state flexible DC protection test model, so that the test personnel do not need to care about the test model and digital messages. Based on the flexible DC protection test model in the first final state, the corresponding test items for flexible DC protection are completed, specifically including: Based on the flexible DC protection test model of the first final state, corresponding script files are created according to the data names; The corresponding script file is executed to automatically generate the relevant test data and complete the corresponding test items for flexible DC protection.

2. The flexible DC protection field testing method as described in claim 1, characterized in that, Also includes: The test results of flexible DC protection are comprehensively judged by the action information between flexible DC protection and control and the output information of the three-out-of-two protection device.

3. The field testing method for flexible DC protection as described in claim 1, characterized in that, Also includes: The analog output model of the tester is generated after defining the external output ports of the tester. Establish virtual terminal connections for the sampling signal model, the coupling model, and the analog output model of the test instrument to construct a flexible DC protection test model in the second final state; Based on the flexible DC protection test model of the second final state, the corresponding test items of flexible DC protection are completed.

4. The field testing method for flexible DC protection as described in claim 1, characterized in that, The adaptive decoding technology also includes: A dynamic caching mechanism is used to manage the storage and interaction process of received data.

5. The flexible DC protection field testing method as described in claim 2, characterized in that, The comprehensive judgment of the test results of flexible DC protection based on the action information between flexible DC protection and control, as well as the output information of the three-out-of-two protection device, includes: Based on the action information sent to the control system by the flexible DC protection and the tripping information of the three-out-of-two protection device, a comprehensive judgment is made as to whether the action behavior of the flexible DC protection is correct. Based on the time difference between the fault transmission time and the return time of the action information, as well as the time difference between the fault transmission time and the switch action time, the control response time of the flexible DC protection and the action time of the trip switch are obtained.

6. An electronic device, characterized in that, It includes at least one processing unit and at least one storage unit, wherein the storage unit stores a computer program that, when executed by the processing unit, enables the processing unit to perform the steps of the test method according to any one of claims 1-5.

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