Flexible DC digital-analog simulation test system and method

Abstract

The invention discloses a flexible direct-current digital-analog simulation test system and method, and belongs to the technical field of digital-physical hybrid simulation of a power system. The system comprises a real-time digital simulation device unit and a flexible direct current control protection device unit, the real-time digital simulation device unit simulates operation simulation of an alternating-current power grid and flexible direct-current primary equipment and performs digital quantity and analog quantity interaction with the flexible direct-current control protection device unit during simulation operation, and the flexible direct-current control protection device unit is used for providing operation of core control protection logic. The method and the device can be suitable for different test scenes and test requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of digital-physical hybrid simulation of power systems, and more particularly to a flexible direct current digital-physical simulation test system and method. Background Art

[0002] Flexible direct current (VSC-HVDC), also known as multi-layered DC (MMC-HVDC), is a high-voltage direct current (HVDC) transmission technology based on a voltage source converter (VSC) with fully controlled insulated-gate bipolar transistors (IGBTs). Compared to conventional DC transmission, VSC offers numerous advantages, including the absence of AC-side voltage support, the elimination of the risk of commutation failure, and the ability to independently and rapidly regulate active and reactive power. These advantages have led to its widespread application in a variety of fields, including the integration of large-scale renewable energy generation, providing rapid power support to enhance grid stability, powering remote island or passive loads, supplying large cities, and constructing DC grids.

[0003] As flexible DC transmission technology continues to develop, its simulation technology faces numerous challenges. First, the large number of independently behaving switching devices within a flexible DC transmission system, coupled with multi-modal current and voltage balance control issues within the converter, creates a significant conflict between simulation computational scale, speed, and accuracy. Second, the rapid dynamic response and complex fault propagation characteristics of flexible DC transmission systems, coupled with complex interactions with AC systems, further complicate simulation.

[0004] Traditional digital simulation methods can suffer from insufficient computational accuracy when simulating the interaction between HVDC Flexible systems and AC systems. Furthermore, while dynamic physical simulation offers high accuracy, it is limited in scale, making it difficult to perform full-scale dynamic simulations of complex systems. Summary of the Invention

[0005] In view of the above problems, the present invention proposes a flexible DC digital simulation test system, comprising: a real-time digital simulation device unit and a flexible DC control and protection device unit;

[0006] The real-time digital simulation device unit is used to simulate the operation of the AC power grid and the flexible DC primary equipment, and transmit the calculated digital and analog quantities to the flexible DC control and protection device unit;

[0007] The flexible DC control and protection device unit is used to collect the digital and analog quantities, and feed back the pole-controlled voltage reference wave signal and the switch switching command to the real-time digital simulation device unit based on the digital and analog quantities;

[0008] The pole-controlled voltage reference wave signal and the switch switching command are used to control the real-time digital simulation device unit to simulate the operation of the AC power grid and the flexible DC primary equipment.

[0009] Optional analog quantities include: analog signals of voltage and current, and extreme control voltage reference waves.

[0010] Optionally, the operation simulation of the AC power grid and the flexible DC primary equipment includes: simulating the operating characteristics of the AC power grid and the flexible DC primary equipment and the operating status of the flexible DC.

[0011] Optional, real-time digital simulation device unit and flexible DC control protection device unit are connected through a new digital-analog interface;

[0012] The new digital-analog interface is used in the real-time digital simulation device unit and the flexible DC control protection device unit for conversion and transmission of digital-analog signals;

[0013] The novel digital-analog interface comprises:

[0014] Optical protocol conversion interface and physical interface are used for digital-to-analog signal conversion between real-time digital simulation device units and flexible DC control and protection device units.

[0015] Optional, new digital-to-analog interface converts and transmits digital-to-analog signals, including:

[0016] The optical fiber signals transmitted through the optical protocol conversion interface include: analog output signals, analog input signals, switching output signals and switching input signals;

[0017] Signals transmitted through the physical interface include: analog output D / A signals.

[0018] Optional optical protocol conversion interface, used for 2G Aurora communication between the real-time digital simulation device unit and the flexible DC control and protection device unit.

[0019] Optional, optical protocol conversion interface, with 4 SFP communication ports, namely SFP1~SFP4, the uplink port is fixed to SFP1, the transmission protocol is Ethernet or Aurora, the downlink port is set to SFP2~SFP4, configured in two working modes, the communication protocol is Xilinx's Aurora.

[0020] Optional optical protocol conversion interface with timing function, receiving one IRIG-B timing input and outputting one IRIG-B timing signal.

[0021] Optionally, the physical interface is connected to the optical protocol conversion interface through a 2.5G optical fiber, and electrical quantity interaction is performed with the flexible DC control and protection device unit through the analog output IO interface.

[0022] Optionally, the flexible DC control and protection device unit is also used to provide core control and protection logic for the real-time digital simulation device unit to simulate the operation of the AC power grid and flexible DC primary equipment after feeding back the pole control voltage reference wave signal and the switch switching command.

[0023] In another aspect, the present invention further proposes a flexible DC digital-analog simulation method for a flexible DC digital-analog simulation test system based on a novel digital-analog interface, comprising:

[0024] Simulate the operation of AC power grid and flexible DC primary equipment to generate digital and analog quantities;

[0025] Collecting the digital and analog quantities, and feeding back a pole-controlled voltage reference wave signal and a switch switching command based on the digital and analog quantities;

[0026] The pole-controlled voltage reference wave signal and the switch switching command are used to control the operation of the simulated AC power grid and the flexible DC primary equipment.

[0027] In yet another aspect, the present invention further provides a computing device comprising: one or more processors;

[0028] a processor for executing one or more programs;

[0029] When the one or more programs are executed by the one or more processors, the above-described method is implemented.

[0030] In another aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, the method described above is implemented.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] The present invention proposes a flexible DC digital-analog simulation test system based on a novel digital-analog interface, comprising: a real-time digital simulation device unit for simulating the operation of an AC power grid and flexible DC primary equipment; during the simulation operation, the calculated digital and analog quantities are transmitted to the flexible DC control and protection device unit based on the novel digital-analog interface; the flexible DC control and protection device unit is used to collect the digital and analog quantities, and based on the digital and analog quantities, feedback a polar control voltage reference wave signal and a switch switching command to the real-time digital simulation device unit based on the novel digital-analog interface, and provide the operation of the core control and protection logic; the polar control voltage reference wave signal and the switch switching command are used to control the real-time digital simulation device unit to simulate the operation of the AC power grid and flexible DC primary equipment. The present invention can be applied to different test scenarios and test requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the structure of the system of the present invention;

[0034] Figure 2 Schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0035] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to provide a thorough and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments shown in the accompanying drawings is not intended to limit the present invention. In the accompanying drawings, identical elements are denoted by the same reference numerals.

[0036] Unless otherwise specified, the terms used herein (including technical terms) have the meanings commonly understood by those skilled in the art. In addition, it is understood that terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0037] Example 1:

[0038] The present invention proposes a flexible DC digital simulation test system, such as Figure 1 As shown, it includes: a real-time digital simulation device unit and a flexible DC control and protection device unit;

[0039] The real-time digital simulation device unit is used to simulate the operation of the AC power grid and the flexible DC primary equipment, and transmit the calculated digital and analog quantities to the flexible DC control and protection device unit;

[0040] The flexible DC control and protection device unit is used to collect the digital and analog quantities, and feed back the pole-controlled voltage reference wave signal and the switch switching command to the real-time digital simulation device unit based on the digital and analog quantities;

[0041] The pole-controlled voltage reference wave signal and the switch switching command are used to control the real-time digital simulation device unit to simulate the operation of the AC power grid and the flexible DC primary equipment.

[0042] Among them, analog quantities include: analog signals of voltage and current, and extreme control voltage reference waves.

[0043] Among them, the operation simulation of the AC power grid and the flexible DC primary equipment includes: simulating the operation characteristics of the AC power grid and the flexible DC primary equipment and the operation status of the flexible DC.

[0044] Among them, the real-time digital simulation device unit and the flexible DC control and protection device unit are connected through a new digital-analog interface;

[0045] The new digital-analog interface is used in the real-time digital simulation device unit and the flexible DC control protection device unit for conversion and transmission of digital-analog signals;

[0046] The novel digital-analog interface comprises:

[0047] Optical protocol conversion interface and physical interface are used for digital-to-analog signal conversion between real-time digital simulation device units and flexible DC control and protection device units.

[0048] The digital-to-analog signals converted and transmitted by the new digital-to-analog interface include:

[0049] The optical fiber signals transmitted through the optical protocol conversion interface include: analog output signals, analog input signals, switching output signals and switching input signals;

[0050] Signals transmitted through the physical interface include: analog output D / A signals.

[0051] Among them, the optical protocol conversion interface is used for 2G Aurora communication between the real-time digital simulation device unit and the flexible DC control and protection device unit.

[0052] Among them, the optical protocol conversion interface has 4 SFP communication ports, namely SFP1~SFP4. The uplink port is fixed to SFP1, the transmission protocol is Ethernet or Aurora, and the downlink port is set to SFP2~SFP4, configured in two working modes, and the communication protocol is Xilinx's Aurora.

[0053] Among them, the optical protocol conversion interface has a timing function, receives one IRIG-B timing input, and outputs one IRIG-B timing signal.

[0054] Among them, the physical interface is connected to the optical protocol conversion interface through a 2.5G optical fiber, and the electrical quantity interaction is carried out with the flexible DC control and protection device unit through the analog output IO interface.

[0055] Among them, the flexible DC control and protection device unit is also used to feedback the pole control voltage reference wave signal and the switch switching command, and provide the core control and protection logic for the real-time digital simulation device unit to simulate the operation of the AC power grid and the flexible DC primary equipment.

[0056] The present invention will be further described below with reference to specific cases:

[0057] like Figure 1As shown, the system of the present invention is based on a real-time digital simulation device, which is connected to a flexible DC control protection device through a new digital-analog interface to realize closed-loop testing.

[0058] Real-time digital simulation device simulates AC power grid and flexible DC primary equipment, and simulates the operating characteristics of the power grid and the operating status of flexible DC;

[0059] A new digital-analog interface connects the real-time simulation device and the flexible DC control protection device, and is used for signal interaction between the real-time simulation device and the flexible DC control protection device;

[0060] Flexible DC control and protection device realizes core control and protection logic operation, analog quantity acquisition, feedback of pole control voltage reference wave and other functions.

[0061] The new digital-analog interface includes: an optical protocol conversion interface and a physical interface, which are used to realize the digital-analog signal conversion between the real-time digital simulation device and the flexible DC control and protection device.

[0062] The new digital-to-analog interface is connected to the real-time digital simulation device and the flexible DC control and protection device at the same time, and is used to control the operating characteristics of the closed-loop test system composed of the real-time digital simulation device and the flexible DC control and protection device. The optical fiber signal in the optical protocol conversion interface in the connection signal includes analog output signal, analog input signal, switch output, and switch input signal, and the physical interface signal includes analog output D / A signal.

[0063] The optical protocol conversion interface can realize 2G Aurora communication between the real-time digital simulation device and the flexible DC control and protection device. The interface can be connected to the ADPSS's 10G optical fiber network card through 10G optical Ethernet, connected to the ADPSS physical interface device through the 2.5G Aurora communication protocol, and connected to the flexible DC control and protection 2G communication optical port through the 2G Aurora communication protocol. The Aurora communication protocol format complies with the communication protocol format requirements of the Xilinx communication standard.

[0064] The optical protocol conversion interface features four SFP communication ports, SFP1 through SFP4. The uplink port is fixed at SFP1, with a transmission rate of 10G and a transmission protocol of Ethernet or Aurora. Up to three downlink ports (SFP2 through SFP4) can be configured, all of which can operate in 2G or 2.5G mode. At 2G and 2.5G speeds, the communication protocol is Xilinx's Aurora communication format. The device also features a timing function, receiving one IRIG-B timing input and simultaneously outputting one IRIG-B timing signal. Its interface is ST-type.

[0065] The physical interface can be connected to the optical protocol conversion interface device through a 2.5G optical fiber, and electrical quantity interaction can be performed with the flexible DC control and protection device through the analog output interface. The electrical specification protocol conforms to the standard flexible DC control and protection device interface characteristics and can be seamlessly connected.

[0066] Each analog output module (AO) provides 32 independent AO channels, each capable of independently controlling the output of a -10V to +10V voltage signal, with a maximum bandwidth of 1MHz and output accuracy of less than 2mV. Output current: ±5mA max; DA resolution: 16-bit; absolute accuracy: ≤0.02%; refresh rate: ≥1M; isolation voltage: ≥500V DC.

[0067] The number of each of the real-time digital simulation device, the optical protocol interface, the physical interface AO, and the flexible DC control and protection device is at least 1.

[0068] The present invention combines the advantages of the accuracy of physical simulation models and the flexibility of digital simulation device modeling, constructs a hybrid simulation test method for digital-analog flexible DC control and protection devices, and can be used as a calibration clock for pure digital simulation and dynamic analog simulation of flexible DC.

[0069] This invention provides an important technical means for the research on network detection and grid planning before the flexible DC control and protection device is connected to the grid, as well as safe and stable operation and fault inversion after grid connection, and has broad application prospects.

[0070] By introducing a novel digital-to-analog interface, this invention overcomes the wiring issues of traditional electrical signal connections, enabling efficient and accurate data exchange between the digital simulation device and the flexible DC control and protection device. This helps to more accurately simulate the actual operating characteristics of the flexible DC transmission system, including its dynamic response, stability, and interaction with other power systems.

[0071] The present invention adopts advanced communication technology and data processing algorithm, thereby reducing the delay and error in the data transmission process and further improving the accuracy of simulation.

[0072] This invention allows for flexible adjustment and control of various parameters, such as voltage, current, and power, during simulation to accommodate diverse testing needs and scenarios. Through a novel digital-to-analog interface, it facilitates access to various flexible DC control and protection devices, enabling testing and verification of a wide range of flexible DC transmission technologies and solutions.

[0073] The present invention takes the Chongqing-Hubei flexible DC digital-analog simulation test as an example, and constructs a flexible DC digital-analog simulation test system with a new digital-analog interface, which includes an ADPSS real-time digital simulation device 1, a new digital-analog interface 8, and a Chongqing-Hubei flexible DC control and protection device 9, wherein the new digital-analog interface 8 is composed of an optical protocol conversion interface 3 and a physical interface 5. The ADPSS real-time digital simulation device 1 is connected to the ADPSS real-time digital simulation device 10G optical fiber network card and the optical protocol conversion interface 3 through a 10G Ethernet optical fiber 2. The optical protocol conversion interface is connected to the physical interface 5 through an optical fiber 4 of the 2.5G Aurora communication protocol. The optical protocol conversion interface is connected to the Chongqing-Hubei flexible DC control and protection device 9 through an optical fiber 6 of the 2G Aurora communication protocol. The physical interface is connected to the Chongqing-Hubei flexible DC control and protection device 9 through an electrical signal IO connection 7 that passes through the analog output AO and the digital input DI respectively.

[0074] The ADPSS Real-Time Digital Simulation System (ADPSS) is a fully digital simulation system developed by the China Electric Power Research Institute Co., Ltd., based on a high-performance server cluster. It utilizes network parallel computing technology to decompose computational tasks and provide real-time and synchronous control of processes. It enables real-time and beyond-real-time simulation of electromechanical and electromagnetic transients in large-scale, complex AC / DC power systems, as well as testing of external physical devices. It is capable of real-time simulation of full electromagnetic transients in power grids with a capacity of 100,000 nodes, as well as hybrid digital-analog simulation. The ADPSS hardware platform, based on a high-performance server cluster and FPGA chips, offers high cost-effectiveness and excellent scalability. The core software is based on the mature commercial Power System Analysis and Synthesis Program (PSASP), ensuring high reliability and data compatibility.

[0075] The new digital-to-analog interface includes an optical protocol conversion interface 3 that uses optical communication to implement analog output, analog input, digital output, and digital input, and a physical interface 5 that uses electrical signals (IO) to implement analog output. The optical analog output primarily includes analog signals such as the converter bus voltage, converter transformer valve-side voltage and current, and DC field voltage and current. The optical digital output primarily includes switching signals such as converter transformer tap position and switch status. The optical digital input primarily includes switching signals such as the pole control voltage reference wave, switch switching commands, and converter transformer raising and lowering commands issued by the control and protection device. The electrical analog output primarily includes AC and DC voltage and current signals.

[0076] The Chongqing-Hubei Flexible DC control and protection device, manufactured by Xuji Electric, features functionality identical to that of the on-site system. The ADPSS real-time digital simulation device 1, the new digital-to-analog interface 8, and the Chongqing-Hubei Flexible DC control and protection device 9 together constitute a flexible DC digital-to-analog simulation test system based on the new digital-to-analog interface. The operating process is as follows: The ADPSS real-time digital simulation device 1 simulates actual grid data from the Chongqing-Hubei Flexible DC primary system, performing real-time simulation. It then interacts with the Chongqing-Hubei Flexible DC control and protection device 9 via the new digital-to-analog interface, achieving a closed-loop simulation. The exchanged data includes both optical fiber and electrical I / O signals, ultimately achieving successful unlocking and steady-state operation of the Chongqing-Hubei Flexible DC transmission system. Operations such as fault simulation testing can also be performed. The signal quantities exchanged via the new digital-to-analog interface are shown in Table 1.

[0077] Table 1

[0078]

[0079] Example 2:

[0080] The present invention also proposes a flexible DC digital simulation method for a flexible DC digital simulation test system, such as Figure 2 Shown, including:

[0081] Step 1: Simulate the operation of the AC power grid and flexible DC primary equipment to generate digital and analog quantities;

[0082] Step 2: collecting the digital and analog quantities, and feeding back a pole control voltage reference wave signal and a switch switching command based on the digital and analog quantities;

[0083] The pole-controlled voltage reference wave signal and the switch switching command are used to control the operation of the simulated AC power grid and the flexible DC primary equipment.

[0084] Step 3: During simulation operation, the flexible DC control and protection device unit is used to provide core control and protection logic operations.

[0085] The present invention can be applied to different test scenarios and test requirements.

[0086] Example 3:

[0087] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or may be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function, so as to implement the steps of the method in the above embodiment.

[0088] Example 4:

[0089] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It can be understood that the computer-readable storage medium here can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space that stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space. These instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method in the above embodiment.

[0090] It will be understood by those skilled in the art that the embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of the present invention may be implemented in various computer languages, for example, the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0091] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0092] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0093] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0094] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0095] Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if such changes and modifications fall within the scope of the claims and their equivalents, the present invention is intended to include such changes and modifications.

Claims

1. A flexible DC digital simulation test system, characterized in that: include: Real-time digital simulation device unit and flexible DC control and protection device unit; The real-time digital simulation device unit is used to simulate the operation of the AC power grid and the flexible DC primary equipment, and transmit the calculated digital and analog quantities to the flexible DC control and protection device unit; The flexible DC control and protection device unit is used to collect the digital and analog quantities, and feed back the pole-controlled voltage reference wave signal and the switch switching command to the real-time digital simulation device unit based on the digital and analog quantities; The pole-controlled voltage reference wave signal and the switch switching command are used to control the real-time digital simulation device unit to simulate the operation of the AC power grid and the flexible DC primary equipment.

2. The flexible DC digital simulation test system according to claim 1 is characterized in that: The analog quantity includes: analog signals of voltage and current, and pole-controlled voltage reference waves.

3. The flexible DC digital simulation test system according to claim 1 is characterized in that: The operation simulation of the simulated AC power grid and the flexible DC primary equipment includes: simulating the operation characteristics of the AC power grid and the flexible DC primary equipment and the operation status of the flexible DC.

4. The flexible DC digital simulation test system according to claim 1, characterized in that: The real-time digital simulation device unit and the flexible DC control protection device unit are connected via a new digital-analog interface; The new digital-analog interface is used in the real-time digital simulation device unit and the flexible DC control protection device unit for conversion and transmission of digital-analog signals; The novel digital-analog interface comprises: Optical protocol conversion interface and physical interface are used for digital-to-analog signal conversion between real-time digital simulation device units and flexible DC control and protection device units.

5. The flexible DC digital simulation test system according to claim 4 is characterized in that: The digital-to-analog signals converted and transmitted by the novel digital-to-analog interface include: The optical fiber signals transmitted through the optical protocol conversion interface include: analog output signals, analog input signals, switching output signals and switching input signals; Signals transmitted through the physical interface include: analog output D / A signals.

6. The flexible DC digital simulation test system according to claim 4, characterized in that: The optical protocol conversion interface is used for 2G Aurora communication between the real-time digital simulation device unit and the flexible DC control and protection device unit.

7. The flexible DC digital simulation test system according to claim 4, characterized in that: The optical protocol conversion interface has four SFP communication ports, namely SFP1 to SFP4. The uplink port is fixed to SFP1, and the transmission protocol is Ethernet or Aurora. The downlink port is set to SFP2 to SFP4 and is configured in two working modes. The communication protocol is Xilinx's Aurora.

8. The flexible DC digital simulation test system according to claim 4, characterized in that: The optical protocol conversion interface has a timing function, receives one IRIG-B timing input, and outputs one IRIG-B timing signal.

9. The flexible DC digital simulation test system according to claim 4, characterized in that: The physical interface is connected to the optical protocol conversion interface via a 2.5G optical fiber, and performs electrical quantity interaction with the flexible DC control and protection device unit via the analog output IO interface.

10. The flexible DC digital simulation test system according to claim 1, characterized in that: The flexible DC control and protection device unit is also used to provide core control and protection logic for the real-time digital simulation device unit to simulate the operation of the AC power grid and the flexible DC primary equipment after feeding back the pole control voltage reference wave signal and the switch switching command.

11. A flexible DC digital analog simulation method using a flexible DC digital analog simulation test system based on a novel digital analog interface as claimed in any one of claims 1 to 10, characterized in that: include: Simulate the operation of AC power grid and flexible DC primary equipment to generate digital and analog quantities; Collecting the digital and analog quantities, and feeding back a pole-controlled voltage reference wave signal and a switch switching command based on the digital and analog quantities; The pole-controlled voltage reference wave signal and the switch switching command are used to control the operation of the simulated AC power grid and the flexible DC primary equipment.

12. A computer device, characterized in that: include: one or more processors; a processor for executing one or more programs; When the one or more programs are executed by the one or more processors, the method according to claim 11 is implemented.

13. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the computer program is executed, the method according to claim 11 is implemented.

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