Flexible direct current protection field test method and device

Abstract

The invention discloses a flexible direct-current protection field test method, which comprises the following steps: constructing a sampling signal model of a measurement unit based on an adaptive decoding technology in combination with engineering field actual sampling data of the measurement unit; constructing a coupling model of flexible direct current control and protection according to the mapping relation between the flexible direct current control and protection of the engineering site and the corresponding transmission information; virtual terminal connection of the sampling signal model and the coupling model is established, and a flexible direct current protection test model in a first final state is constructed; and based on the flexible direct current protection test model, completing corresponding test items of flexible direct current protection. According to the invention, after the privatized sampling value of the flexible converter station and the privatized interaction data between control and protection are modeled, the direct current protection can be decoupled from the converter station; and virtual terminal connection between the constructed models is established, and corresponding test items of flexible direct current protection are completed, so that the laboratory limitation is broken through, and the universality of the flexible direct current protection test technical means is improved.

Description

Technical Field

[0001] The present application relates to the technical field of flexible direct current transmission, and more specifically, to a flexible direct current protection on-site testing method and equipment. Background Art

[0003] As the brain of flexible DC transmission projects, flexible DC control and protection currently relies mainly on the laboratory to build a digital-analog hybrid simulation system and establish a test environment to verify its functional performance. However, the project field test is still difficult to be effectively carried out due to the main limitations of factors such as the variety of measurement unit types, non-uniform transmission methods, privatization of transmission protocols, and deep coupling between control and protection. Considering that unlike mature AC control and protection technology, DC control and protection equipment still needs to face the objective demand of frequent program logic upgrades and modifications after commissioning, the lack of effective field testing technology and methods is a great hidden danger to the safe and stable operation of flexible DC transmission projects and even large power grids.

[0004] Therefore, it is urgent to study the field test method of flexible DC protection to provide a practical means for the field test of the functional performance of flexible DC protection and to ensure the safe and stable operation of flexible DC transmission projects and even large power grids. Summary of the invention

[0005] In response to at least one defect or improvement need in the prior art, the present application provides a flexible DC protection field testing method and equipment, which solves the technical problems of the current flexible DC protection equipment lacking field testing means, poor field testing results, poor operability and poor versatility.

[0006] To achieve the above objectives, in a first aspect, the present application provides a flexible DC protection field testing method, comprising:

[0007] Based on adaptive decoding technology and combined with the actual sampling data of the measurement unit engineering site, a sampling signal model of the measurement unit is constructed;

[0008] According to the mapping relationship between flexible DC control and protection at the project site and the corresponding transmission information, a coupling model of flexible DC control and protection is constructed;

[0009] Establishing a virtual terminal connection between the sampling signal model of the measurement unit and the coupling model of the flexible DC control and protection, and constructing a flexible DC protection test model of the first final state;

[0010] Based on the flexible DC protection test model of the first final state, corresponding test items of the flexible DC protection are completed.

[0011] Furthermore, it also includes:

[0012] The test results of the flexible DC protection are comprehensively judged based on the action information between the flexible DC protection and control and the output information of the three-out-of-two protection device.

[0013] Furthermore, the adaptive decoding technology includes:

[0014] Determine the signal transmission mode by using the clock signal accompanying the signal transmission process;

[0015] Get the transmission baud rate of the signal and confirm that the baud rate is stable;

[0016] The corresponding link layer transmission threshold is obtained from the signal transmission baud rate to complete the link layer transmission analysis;

[0017] The protocol type parameters in the application layer data are obtained, and the message type and data attributes of the application layer are determined through the actual sampling data of the measurement unit engineering site.

[0018] Furthermore, it also includes:

[0019] Generate the analog output model of the tester after defining the external output port of the tester;

[0020] Establish virtual terminal connections of 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 tester to construct a flexible DC protection test model of the second final state;

[0021] Based on the flexible DC protection test model of the second final state, corresponding test items of the flexible DC protection are completed.

[0022] Furthermore, the adaptive decoding technology also includes:

[0023] A dynamic cache mechanism is used to manage the storage and interaction process of received data.

[0024] Furthermore, the construction of the coupling model of flexible DC control and protection according to the mapping relationship between the flexible DC control and protection at the project site and the corresponding transmission information includes:

[0025] The control bus for interaction between flexible DC protection and control adopts a GOOSE-like transmission mode; the link layer of the Ethernet message has a fixed format, and the link layer information is obtained by reading the message. The application layer information in the message is generated based on the mapping relationship between flexible DC control and protection; thus, a flexible DC protection model and a flexible DC control model are constructed respectively;

[0026] The flexible DC protection model and the flexible DC control model are coupled to construct the coupling model of the flexible DC control and protection.

[0027] Furthermore, the establishing of the virtual terminal connection between the sampling signal model of the measurement unit and the coupling model of the flexible DC control and protection to construct the flexible DC protection test model of the first final state includes:

[0028] Using the graphical tool of the host computer of the tester, according to the connection relationship of the measurement interface at the engineering site and the connection relationship between the flexible DC control and protection, the sampling signal model of the measurement unit and the coupling model of the flexible DC control and protection are connected as virtual terminals to construct the flexible DC protection test model of the first final state.

[0029] Furthermore, the flexible DC protection test model based on the first final state completes the test items corresponding to the flexible DC protection, including:

[0030] Based on the flexible DC protection test model of the first final state, a corresponding script file is established according to the data name;

[0031] Execute the corresponding script file to automatically generate the corresponding test data and complete the corresponding test items of the flexible DC protection.

[0032] Furthermore, the comprehensive judgment of the test result of the flexible DC protection based on the action information between the flexible DC protection and the control and the output information of the two-out-of-three protection device includes:

[0033] Based on the action information sent by the flexible DC protection to the control and the switch tripping information of the three-out-of-two protection device, comprehensively judge whether the action behavior of the flexible DC protection is correct;

[0034] According to the time difference between the fault sending time and the return time of the action information, and the time difference between the fault sending time and the switch action time, the control response time of the flexible DC protection and the action time of the tripping switch are obtained.

[0035] In a second aspect, the present application provides an electronic device comprising at least one processing unit and at least one storage unit, wherein the storage unit stores a computer program, and when the computer program is executed by the processing unit, the processing unit is enabled to perform the steps of any of the aforementioned test methods.

[0036] In general, the above technical solutions conceived by the present application can achieve the following beneficial effects compared with the prior art:

[0037] (1) After the private sampling values ​​of the flexible converter station and the private interaction data between control and protection are modeled, the DC protection can be decoupled from the converter station; then the virtual terminal connection between the constructed models is established, and the corresponding test items of the flexible DC protection can be completed based on the connected models. The flexible DC protection field test method based on model decoupling proposed in this application can carry out a comprehensive test of the functional performance of the flexible DC protection at the site of the flexible DC transmission project, breaking through the limitation that the current flexible DC protection test can only be carried out in the laboratory relying on a digital-analog hybrid simulation system, and increasing the versatility of the flexible DC protection test technical means.

[0038] (2) The present application can make a comprehensive judgment on the test results of the flexible DC protection through the action information between the flexible DC protection and control and the output information of the three-out-of-two protection device, and complete the analysis of the DC protection action behavior, so as to more finely grasp the DC protection action behavior and improve the safety of the flexible DC protection.

[0039] (3) This application realizes the adaptive decoding function of digital sampling by adopting adaptive decoding technology, solves the problem of poor universality of the test method caused by different manufacturers or equipment models, and meets the DC protection on-site testing requirements of different flexible DC transmission projects.

[0040] (4) In order to protect the integrated design of the test, the present application also models the analog output, so that the digital and analog quantities can be implemented using the same set of models. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 A core flow chart of a flexible DC protection field test method provided in an embodiment of the present application;

[0043] Figure 2 A schematic diagram of the wiring for on-site testing of flexible DC protection provided in an embodiment of the present application;

[0044] Figure 3 An architecture diagram of a DC control and protection integrated test system for wireless transmission of multi-source data provided in an embodiment of the present application;

[0045] Figure 4 A schematic diagram of a sampling signal model adaptive decoding function principle flow diagram provided in an embodiment of the present application;

[0046] Figure 5 A block diagram of an electronic device provided in an embodiment of the present application that is suitable for implementing the testing method described above. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not intended to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0048] The terms "first", "second" or "nth" in the specification, claims or drawings of the present application are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" or "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units that are not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0049] At present, the method of conducting flexible DC protection testing in the laboratory requires the configuration of auxiliary equipment such as merging units, converter valve control equipment, interface equipment, etc. that are consistent with the on-site ones. Due to different manufacturers, these devices are usually not universal and cannot be compatible with the DC protection testing requirements of different flexible DC transmission projects. In addition, the method of conducting flexible DC protection testing in the laboratory needs to be based on a simulation system. Generally, in order to ensure the test efficiency, a large real-time simulation system such as RTDS needs to be configured. This results in the problem that traditional technical means cannot be carried out on the project site and the test environment can only be limited to the laboratory. In view of this, the present application proposes a flexible DC protection on-site testing method and equipment, which solves the technical problems of the current lack of on-site testing means, poor on-site testing results, poor operability and poor versatility of flexible DC protection equipment.

[0050] refer to Figure 2In some embodiments, the present 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 signals output by the DC voltage divider; the DA conversion module is responsible for outputting small voltage signals, analog signals, and special signal outputs such as zero flux transformers; the optical fiber Ethernet interface is hung on the process bus network of the DC control protection to realize communication with the DC protection and control; the I / O module receives and outputs switch quantity information; the FT3 receiving module receives the digital quantity information from the DC electronic transformer merging unit, and the FT3 sending module simulates the digital signal of the DC electronic transformer merging unit to send data to the DC protection device (DC protection device). The host computer of the tester is responsible for establishing the corresponding test model and completing the configuration of the test data and human-computer interaction. The three-out-of-two protection device is an electrical protection device, which mainly includes three protection functions: current protection, voltage protection, and differential protection, and is used to protect electrical equipment in the power system from 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 damaging the electrical equipment and affecting the normal operation of the power system.

[0051] refer to Figure 3 In some embodiments, the present application adopts a dual CPU architecture design of FPGA+MPC, which can realize data output and reception of multiple protocols and formats in one device. MPC8247 is a microprocessor that supports a frequency of 266-400MHz.

[0052] refer to Figure 1 In some embodiments, based on Figure 2 and Figure 3 A flexible DC protection field testing method designed for the hardware architecture may include the following steps.

[0053] Step 1: Generation of a sampling value model (ie, a sampling signal model of a measurement unit): Based on the adaptive decoding technology and combined with the actual sampling data of the measurement unit engineering site, a sampling signal model of the measurement unit is constructed.

[0054] In some embodiments, specifically, since the output of the flexible DC electronic transformer is basically 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 data and communicate with other devices), there are two sampling rates: 10k and 50k. The 10k sampling value protocol is basically specified, but the specific data definition has not yet been clarified. The 50k sampling value output protocol is highly privatized, so it is necessary to conduct joint debugging on site. At this time, the FT3 adaptive sampling technology is designed to analyze the FT3 data, establish a protocol model and a data model, import the sampling value excel file of the DC electronic transformer on site (the engineering file prepared in advance), and then read the sampling value of the DC electronic transformer and finally generate an XML file of the sampling value, that is, the mu.icd file of the sampling value.

[0055] ICD file, also known as ICD file of IEC 61850, is a file format used to describe the capabilities of intelligent electronic devices (IED). This file is written in XML format with the suffix ".icd". It is mainly used to describe the point table of the device, including the communication parameters, data model and services of the device.

[0056] Flexible DC sampling value transmission is based on the IEC60044-8 serial transmission protocol (i.e., FT3 protocol. The link layer in the IEC60044-8 standard is selected as the FT3 format of IEC 60870-5-1. The standard transmission speed of the general frame is 10Mbit / s (data clock), Manchester encoding is used, and the MSB (most significant bit) is transmitted first.), and the protocols of different manufacturers or models may differ in sampling frequency, encoding method, transmission baud rate, and data set length. This is a key issue that needs to be solved by the DC control and protection test device.

[0057] like Figure 4 As shown, in order to realize the adaptive decoding function of digital sampling, it is necessary to use FPGA to perform hardware decoding on the data bottom layer of the original signal, and take corresponding processing measures at the physical layer, link layer and application layer of the transmission protocol. The specific steps may include:

[0058] (1) Determination of encoding method

[0059] According to the difference in coding principles between Manchester coding (synchronous mode) and TTL coding (asynchronous mode), the clock signal accompanying the signal transmission process is used to determine whether the signal transmission mode is synchronous or asynchronous.

[0060] (2) Baud rate determination

[0061] The transmission duration of a data bit 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.

[0062] Continuously obtain the displacement cycle of the original signal T bc The data baud rate is determined by the minimum bit change period value, and then the baud rate stability test is performed to determine the baud rate of the message.

[0063] (3) Link layer transmission

[0064] The corresponding link layer transmission threshold is calculated from the transmission baud rate of the original signal to complete the link layer transmission analysis. The transmission link of the FT3 protocol includes three fixed areas: the start character, the data block, and the CRC check code. It has nothing to do with the protocol type and can adopt a unified link analysis mechanism.

[0065] The link transmission starts with the specified data start character, and the data blocks are received according to fixed bytes. The CRC check code is inserted at the end of each data block. When the received data block reaches the maximum and the corresponding block CRC check code is received, the link transmission ends and returns to wait for the start character of the next transmission.

[0066] (4) Application layer analysis and verification

[0067] Generally speaking, the contents of data sets transmitted by FT3 protocols of different manufacturers are also different. To realize automatic identification, it is necessary to obtain the "protocol type" parameter in the application layer data (in DC projects, this parameter is generally located in the 1st and 2nd bytes of the data set). Through the sampled value Excel file imported in advance, the message type and data attributes of the application layer are determined. Data channels not in the Excel file are treated as empty channels.

[0068] (5) Sampling frequency adaptation

[0069] In order to adapt to the different sampling frequencies of the FT3 protocol, a dynamic cache mechanism can be used to manage the storage and interaction process of received data.

[0070] The present application realizes the adaptive decoding function of digital sampling by adopting adaptive decoding technology, solves the problem of poor universality of test methods caused by different manufacturers or equipment models, and meets the DC protection on-site testing needs of different flexible DC transmission projects.

[0071] Step 2: Generate a control and protection bus model (i.e., a coupling model of flexible DC control and protection). According to the mapping relationship between flexible DC control and protection at the project site and the corresponding transmission information, a coupling model of flexible DC control and protection is constructed.

[0072] The on-site detection of DC protection is different from that of AC protection. The coupling between DC control and protection is relatively deep, while AC is not coupled. Therefore, it is not feasible to use the traditional AC protection method for DC protection. In some embodiments, specifically, the control bus for interaction between flexible DC protection and control adopts 100M optical fiber Ethernet and adopts a GOOSE-like transmission mode (the GOOSE transmission mode is mainly based on the IEC 61850 standard, adopts Ethernet virtual LAN and traffic priority technology, and its message contains a priority / virtual LAN identification domain defined by a VLAN tag, which is used to give priority to or separate messages with high reliability, strong real-time performance, and high priority requirements from other network traffic.), there is also only an excel file (pre-prepared engineering file) with mapping relationships between control to protection and protection to control, the link layer of the Ethernet message has a fixed format, the link layer information is obtained by reading the message, and the application layer information in the message is generated by the imported mapping relationship excel file. Thus, an XML model (flexible DC protection model) file of protection (ie, DC protection device), ie, relay.icd, and an XML model (flexible DC control model) file of control (ie, DC control host), ie, control.icd, are respectively established.

[0073] The flexible DC protection model and the flexible DC control model are coupled to construct a coupling model of flexible DC control and protection.

[0074] Step 3: Generate an external analog quantity model (ie, the analog quantity output model of the tester).

[0075] The external analog quantity is determined by the hardware capability of the tester, because the analog quantity transmission is determined by the wiring. Therefore, preferably, the XML model of the tester (ie, the analog quantity output model of the tester) file text.icd is generated after defining the external output port of the tester.

[0076] In order to protect the integrated design of the test, the present application also models the analog output, so that the digital and analog quantities can be implemented using the same set of models.

[0077] Step 4: Test the virtual terminal connection.

[0078] The graphical tool of the host computer of the tester is used to establish the connection relationship of the external signals (i.e. the aforementioned sampling value model and control protection bus model) required for the on-site test of the flexible DC protection project. At this time, the tester no longer needs to care about the test model and digital quantity message, thus facilitating the user's operation.

[0079] Using the graphical tool of the host computer of the flexible DC protection project field tester, according to the connection relationship of the actual ports of the flexible DC protection equipment on the project site (the connection relationship of the measurement interface, the connection relationship between the flexible DC control and protection), the flexible DC protection model file relay.icd, the flexible DC control model file control.icd, the sampling value model file mu.icd of the electronic transformer and the analog output model file text.icd of the tester are connected together to establish the final flexible DC protection test model icd file.

[0080] The aforementioned models are inheritable, and the flexible DC converter station with the same protocol can be obtained by simply replacing the on-site engineering data and connection relationships.

[0081] Step 5: Implement the on-site automatic test of the flexible DC protection through the script file.

[0082] 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 a test output channel, a mapping matrix of flexible DC control and protection, and a switch quantity return channel, respectively, as a parameter configuration function and a test result judgment function of the flexible DC protection field test.

[0083] More specifically, after reading the aforementioned final flexible DC protection test model icd file, the host computer generates a test output interface (DC sampling value, AC sampling value, special sampling channel, and switch output channel), and a control to protection mapping matrix interface, which is the output parameter configuration interface of the protection test; and generates a protection to control mapping matrix interface and a switch return interface, which are the test interfaces after the protection action.

[0084] The test data can be configured manually (configure the transient and steady-state data of the current and voltage on the AC and DC sides, the switch quantity information, the information controlled to the protection, and the state sequence), or dynamically generated through the test script file (according to the flexible DC protection logic, automatically generate the required test data). Then, based on the test data, complete the corresponding test items of the flexible DC protection.

[0085] The present application realizes automatic testing through script files. After modeling, the mapping and logical relationship between data have been completed. At this time, it is only necessary to establish the corresponding script file according to the data name, and the tester software can realize the automatic testing of the flexible DC protection site by executing the script file.

[0086] After the private sampling values ​​of the flexible converter station and the private interaction data between control and protection are modeled in this application, the DC protection can be decoupled from the converter station. By modeling the private protocol, the DC protection is decoupled, so that there is no need to spend a lot of time on protocol joint debugging. A virtual terminal connection is established between the constructed models, and the corresponding test items of the flexible DC protection can be completed based on the connected models. The flexible DC protection field test method based on model decoupling proposed in this application can carry out a comprehensive test of the functional performance of the flexible DC protection at the site of the flexible DC transmission project, breaking through the limitation that the current flexible DC protection test can only be carried out in the laboratory relying on a digital-analog hybrid simulation system, and increasing the versatility of the flexible DC protection test technical means.

[0087] Step 6: Preferably, the DC protection action behavior is analyzed. A comprehensive judgment is made on the test result of the flexible DC protection based on the action information between the flexible DC protection and the control and the output information of the two-out-of-three protection device.

[0088] In some embodiments, specifically, the tester receives action information sent from the flexible DC protection to the control in the protected optical fiber Ethernet data and switch tripping information of the three-out-of-two protection device to comprehensively determine whether the action behavior of the flexible DC protection is correct.

[0089] According to the time difference between the fault sending time and the return time of the action information, and the time difference between the fault sending time and the switch action time, the control response time of the flexible DC protection and the action time of the tripping switch are obtained.

[0090] The present application can make a comprehensive judgment on the test results of the flexible DC protection through the action information between the flexible DC protection and control and the output information of the three-out-of-two protection device, and complete the analysis of the DC protection action behavior, so as to more finely grasp the DC protection action behavior and improve the safety of the flexible DC protection.

[0091] Figure 5 A block diagram of an electronic device suitable for implementing the above-described testing method according to an embodiment of the present application is schematically shown. Figure 5 The electronic device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0092] 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 part 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 a related chipset and / or a special-purpose microprocessor (e.g., an application-specific integrated circuit (ASIC)), and the like. The processor 1001 may also include an 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 an embodiment of the present application.

[0093] In RAM 1003, various programs and data required for the operation of electronic device 1000 are stored. Processor 1001, ROM 1002 and RAM 1003 are connected to each other via bus 1004. Processor 1001 performs various operations of the test method flow according to the embodiment of the present application by executing the program in ROM 1002 and / or RAM 1003. It should be noted that the program can also be stored in one or more memories other than ROM 1002 and RAM 1003. Processor 1001 can also perform various operations of the test method flow according to the embodiment of the present application by executing the program stored in the one or more memories.

[0094] According to an embodiment of the present application, the electronic device 1000 may further include an input / output (I / O) interface 1005, which is also connected to the bus 1004. The electronic device 1000 may further include one or more of the following components connected to the I / O interface 1005: an input portion 1006 including a keyboard, a mouse, etc.; an output portion 1007 including a cathode ray tube (CRT), a liquid crystal display (LCD), etc., and a speaker, etc.; a storage portion 1008 including a hard disk, etc.; and a communication portion 1009 including a network interface card such as a LAN card, a modem, etc. The communication portion 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 magnetic disk, an optical disk, a magneto-optical disk, a semiconductor memory, etc., is installed on the drive 1010 as needed, so that a computer program read therefrom is installed into the storage portion 1008 as needed.

[0095] The test method flow according to the embodiment of the present application can be implemented as a computer software program. For example, an embodiment of the present application includes a computer program product, which includes a computer program carried on a computer-readable storage medium, and the computer program includes a program code for executing the test method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from the network through the communication part 1009, and / or installed from the removable medium 1011. When the computer program is executed by the processor 1001, the above-mentioned functions defined in the system of the embodiment of the present application are executed. According to an embodiment of the present application, the system, equipment, device, module and / or unit described above can be implemented by a computer program module.

[0096] The embodiments of the present application also provide a computer-readable storage medium, which may be included in the device / apparatus / system described in the above embodiments, or may exist independently without being assembled into the device / apparatus / system. The above computer-readable storage medium carries one or more programs, and when the above one or more programs are executed, the steps of the test method according to the embodiments of the present application can be implemented.

[0097] According to an embodiment of the present application, the computer-readable storage medium may be a non-volatile computer-readable storage medium, for example, may include but is not limited to: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above. In an embodiment of the present application, the computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, an apparatus, or a device. For example, according to an embodiment of the present application, the computer-readable storage medium may include one or more memories other than the ROM 1002 and / or RAM 1003 described above.

[0098] It should be noted that the functional modules in the various embodiments of the present application can be integrated into a processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The above-mentioned integrated modules can be implemented in the form of hardware or in the form of software functional modules. If the integrated modules are implemented in the form of software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application is essentially 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.

[0099] The flowchart and / or block diagram in the accompanying drawings illustrate the possible architecture, functions and operations of the system, method and computer program product according to various embodiments of the present application. In this regard, each box in the flowchart and / or block diagram can represent a part of a module, program segment or code, and a part of the above-mentioned module, program segment or code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. It should also be noted that each box in the block diagram or flowchart, and the combination of the boxes in the block diagram or flowchart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0100] Those skilled in the art will appreciate that the features described in the various embodiments and / or claims of the present application may be combined and / or combined in a variety of ways, even if such combinations and / or combinations are not explicitly described in the present application. In particular, without departing from the spirit and teachings of the present application, the technical features described in the various embodiments and / or claims of the present application may be combined and / or combined in a variety of ways, and all of these combinations and / or combinations fall within the scope of the present application.

[0101] Although the present application has been shown and described with reference to specific exemplary embodiments of the present application, it should be understood by those skilled in the art that various changes in form and details may be made to the present application without departing from the spirit and scope of the present application as defined by the appended claims and their equivalents. Therefore, the scope of the present application should not be limited to the above-mentioned embodiments, but should be determined not only by the appended claims, but also by the equivalents of the appended claims.

Claims

1. A flexible DC protection on-site testing method, 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; According to the mapping relationship between flexible DC control and protection at the project site and the corresponding transmission information, a coupling model of flexible DC control and protection is constructed; Establishing a virtual terminal connection between the sampling signal model and the coupling model, and constructing a flexible DC protection test model of a first final state; Based on the flexible DC protection test model of the first final state, corresponding test items of the flexible DC protection are completed.

2. The flexible DC protection on-site testing method according to claim 1, characterized in that: Also includes: The test results of the flexible DC protection are comprehensively judged based on the action information between the flexible DC protection and control and the output information of the three-out-of-two protection device.

3. The flexible DC protection on-site testing method according to claim 1, characterized in that: The adaptive decoding technology includes: Determine the signal transmission mode by using the clock signal accompanying the signal transmission process; Get 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 to complete the link layer transmission analysis; The protocol type parameters in the application layer data are obtained, and the message type and data attributes of the application layer are determined through the actual sampling data of the measurement unit engineering site.

4. The flexible DC protection on-site testing method according to claim 1, characterized in that: Also includes: Generate the analog output model of the tester after defining the external output port of the tester; Establishing virtual terminal connections among the sampling signal model, the coupling model, and the analog output model of the tester to construct a flexible DC protection test model of the second final state; Based on the flexible DC protection test model of the second final state, corresponding test items of the flexible DC protection are completed.

5. The flexible DC protection on-site testing method according to claim 3, characterized in that: The adaptive decoding technology also includes: A dynamic cache mechanism is used to manage the storage and interaction process of received data.

6. The flexible DC protection on-site testing method according to claim 1, characterized in that: The construction of the coupling model of flexible DC control and protection according to the mapping relationship between the flexible DC control and protection at the project site and the corresponding transmission information includes: The control bus for interaction between flexible DC protection and control adopts a GOOSE-like transmission mode; the link layer of the Ethernet message has a fixed format, and the link layer information is obtained by reading the message. The application layer information in the message is generated based on the mapping relationship between flexible DC control and protection; thus, a flexible DC protection model and a flexible DC control model are constructed respectively; The flexible DC protection model and the flexible DC control model are coupled to construct the coupling model of the flexible DC control and protection.

7. The flexible DC protection on-site testing method according to claim 1, characterized in that: The step of establishing a virtual terminal connection between the sampling signal model and the coupling model to construct a flexible DC protection test model of the first final state includes: Using the graphical tool of the host computer of the tester, according to the connection relationship of the measurement interface at the engineering site and the connection relationship between the flexible DC control and protection, the sampling signal model and the coupling model are connected as virtual terminals to construct the flexible DC protection test model of the first final state.

8. The flexible DC protection on-site testing method according to claim 1, characterized in that: The flexible DC protection test model based on the first final state completes the test items corresponding to the flexible DC protection, including: Based on the flexible DC protection test model of the first final state, a corresponding script file is established according to the data name; Execute the corresponding script file to automatically generate the corresponding test data and complete the corresponding test items of the flexible DC protection.

9. The flexible DC protection on-site testing method according to claim 2, characterized in that: The comprehensive judgment of the test result of the flexible DC protection based on the action information between the flexible DC protection and the control and the output information of the two-out-of-three protection device includes: Based on the action information sent by the flexible DC protection to the control and the switch tripping information of the three-out-of-two protection device, comprehensively judge whether the action behavior of the flexible DC protection is correct; According to the time difference between the fault sending time and the return time of the action information, and the time difference between the fault sending time and the switch action time, the control response time of the flexible DC protection and the action time of the tripping switch are obtained.

10. An electronic device, characterized in that: The invention comprises at least one processing unit and at least one storage unit, wherein the storage unit stores a computer program, and when the computer program is executed by the processing unit, the processing unit is enabled to perform the steps of the testing method according to any one of claims 1 to 9.

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