Field test method and system for flexible direct current protection system, electronic equipment and medium

Abstract

A field test method for a flexible direct current protection system comprises the following steps: analyzing a flexible direct current protection system architecture to obtain a coupling relationship between flexible direct current protection function execution and flexible direct current control logic; based on the coupling relationship, screening a flexible direct current control signal related to the execution of the flexible direct current protection function from the flexible direct current control logic; according to a flexible direct current control signal which is screened from the flexible direct current control logic and is related to flexible direct current protection function execution, simulating a target flexible direct current control signal which is sent to the flexible direct current protection equipment by the flexible direct current control equipment; and receiving a protection action signal and related information returned by the flexible direct-current protection equipment, and realizing the field test of the flexible direct-current protection. According to the invention, comprehensive detection of the flexible direct current protection function performance can be carried out on a flexible direct current power transmission project site, the limitation that current flexible direct current protection detection can only be carried out in a laboratory by means of a digital-analog hybrid simulation system is broken through, and the technical blank of on-site detection of flexible direct current protection is filled.

Description

Technical Field

[0001] The present invention relates to the technical field of flexible direct current power transmission, and in particular to an on-site testing method, system, electronic equipment and medium of a flexible direct current protection system. Background Art

[0002] As one of the emerging technology routes, Flexible Direct Current (VSC-HVDC) has become a new hotspot in the development and engineering application of high-voltage direct current transmission technology in recent years due to its own technical advantages.

[0003] As the brain of the flexible DC transmission project, the control and protection system is of vital importance for its safe and stable operation, which may even affect the intrinsic safety of the flexible DC transmission project and even the large power grid. Therefore, the flexible DC control and protection system has always been the top priority of the operation, maintenance and repair of the flexible DC transmission project. However, unlike the mutual independence of AC control and protection, the flexible DC control and protection system has the characteristics of deep coupling. The performance detection of the flexible DC protection system needs to be coordinated with the flexible DC control logic. Therefore, it is currently necessary to rely on the laboratory digital-analog hybrid simulation platform to simulate the actual operating environment of the flexible DC transmission project in order to realize the performance detection of the flexible DC protection function. Once the flexible DC control and protection equipment arrives at the project site and is put into operation, only symbolic operation and maintenance work can be performed on the flexible DC protection equipment, such as cleaning and terminal tightening. The lack of effective flexible DC protection on-site detection technology has brought huge hidden dangers to the safe and stable operation of the flexible DC transmission project and even the large power grid.

[0004] Therefore, it is necessary 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 power grids. Summary of the invention

[0005] In view of the above problems, the present invention is proposed to provide an on-site testing method for a flexible DC protection system that overcomes the above problems or at least partially solves the above problems.

[0006] In order to solve the above technical problems, the embodiments of the present application disclose the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention discloses a field testing method for a flexible DC protection system, comprising:

[0008] S100. Analyze the flexible DC protection system architecture to obtain the coupling relationship between the flexible DC protection function execution and the flexible DC control logic;

[0009] S200. Based on the coupling relationship, screening the flexible DC control signal related to the execution of the flexible DC protection function from the flexible DC control logic;

[0010] S300. According to the flexible DC control signal related to the execution of the flexible DC protection function screened from the flexible DC control logic, simulate the target flexible DC control signal sent by the flexible DC control device to the flexible DC protection device; receive the protection action signal and related information returned by the flexible DC protection device to realize on-site testing of the flexible DC protection.

[0011] Furthermore, in S100, the coupling relationship is divided according to the control and protection device of the flexible DC transmission project and its control and protection object, and the coupling relationship between the flexible DC protection function execution and the flexible DC control logic is divided into three parts: system level, converter valve level and sub-module level. Among them, the object of the system-level control and protection device is the flexible DC system, and dead-zone-free protection of the entire project is achieved by dividing different protection partitions.

[0012] Furthermore, the object of the converter valve level control and protection device is the converter valve body, which is used to control and protect the converter valve body and handle converter valve level faults; the object of the sub-module level control and protection device is the basic power unit sub-module of the converter valve, which is used to control and protect the sub-module body, which at least includes IGBT, resistor and capacitor power devices.

[0013] Further, in S200, based on the coupling relationship, a flexible DC control signal related to the execution of the flexible DC protection function is screened from the flexible DC control logic, and the specific method includes: based on the flexible DC control protection program logic, the control signal required by the action logic of each level of flexible DC protection is extracted, and the action logic of the flexible DC protection is associated with the control logic. When the action logic of the flexible DC protection meets the trigger condition, the flexible DC control signal related to the flexible DC protection function is screened by continuing to determine whether the received control signal meets the requirements.

[0014] Further, in S200, based on the coupling relationship, flexible DC control signals related to the execution of the flexible DC protection function are screened from the flexible DC control logic, including flexible DC control signals required for the execution of the flexible DC protection function at three levels: system level, converter valve level and sub-module level. At the system level, the flexible DC control signal at least includes a flexible DC protection device enable signal, a sampling unit enable signal, a flexible DC converter valve unlocking signal, and a flexible DC system control device main signal issued by the flexible DC system control device.

[0015] Furthermore, at the converter valve level, the flexible DC control signal includes at least the instantaneous value signal of the bridge arm current provided by the flexible DC converter valve control device, the main invalid signal of the flexible DC system control device, the bypass quantity signal of the flexible DC converter valve submodule, the bypass switch refusal quantity signal of the flexible DC converter valve submodule, the temporary locking signal of the flexible DC converter valve, and the switching feedback signal of the flexible DC converter valve control device.

[0016] Furthermore, at the sub-module level, the flexible DC control signal includes at least a capacitor voltage signal, a power semiconductor device voltage signal, an energy supply signal, a communication status signal, a bypass switch operation status signal, and a sub-module operation status signal provided by the flexible DC converter valve sub-module control device.

[0017] Furthermore, in S300, based on the flexible DC control signal related to the execution of the flexible DC protection function screened out from the flexible DC control logic, the target flexible DC control signal sent by the flexible DC control device to the flexible DC protection device is simulated, specifically including: based on the communication protocol of the sampling unit adopted by the flexible DC transmission project, simulating the sampling signal of the flexible DC transmission project sent by the sampling unit to the flexible DC protection device; based on the screened flexible DC control signal related to the flexible DC protection function, simulating the target flexible DC control signal sent by the flexible DC control device to the flexible DC protection device.

[0018] Furthermore, in S300, a protection action signal and related information returned by the flexible DC protection device are received, wherein the protection action signal and related information at least include whether the flexible DC protection is executed, the overall execution time of the flexible DC protection, and the execution hysteresis time of the flexible DC protection.

[0019] In a second aspect, an embodiment of the present invention discloses an electronic device, including:

[0020] one or more processors;

[0021] A memory for storing one or more programs;

[0022] When the one or more programs are executed by the one or more processors, the one or more processors implement the DC protection on-site testing method.

[0023] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0024] The present invention discloses a field test method for a flexible DC protection system, comprising: parsing the flexible DC protection system architecture, parsing to obtain the coupling relationship between the execution of the flexible DC protection function and the flexible DC control logic; based on the coupling relationship, screening the flexible DC control signal related to the execution of the flexible DC protection function from the flexible DC control logic; simulating the target flexible DC control signal sent by the flexible DC control device to the flexible DC protection device according to the flexible DC control signal related to the execution of the flexible DC protection function screened from the flexible DC control logic; receiving the protection action signal and related information returned by the flexible DC protection device, and realizing the field test of the flexible DC protection. The present invention can carry out a comprehensive test of the performance of the flexible DC protection function at the site of the flexible DC power 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 filling the gap in the field detection technology of the flexible DC protection.

[0025] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 This is a flow chart of an on-site testing method for a flexible DC protection system in Embodiment 1 of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of an electronic device in Embodiment 2 of the present invention. DETAILED DESCRIPTION

[0029] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0030] In order to solve the problems existing in the prior art, an embodiment of the present invention provides an on-site testing method for a flexible DC protection system.

[0031] Example 1

[0032] The present invention discloses a field test method for a flexible DC protection system. Figure 1 ,include:

[0033] S100. The flexible DC protection system architecture is analyzed to obtain the coupling relationship between the flexible DC protection function execution and the flexible DC control logic; among them, the flexible DC transmission (VSC-HVDC) adopts the voltage source converter (VSC) to accurately control the voltage amplitude and phase of the converter station output through controllable power electronic devices (such as IGBT), thereby realizing the flexible transmission of DC power. As an important part of the system, the flexible DC protection system is responsible for monitoring and protecting each link in the transmission process to ensure that the system can be properly handled in normal operation and fault conditions.

[0034] There is a close coupling relationship between the protection function and control logic of the flexible DC transmission system. This coupling relationship is mainly reflected in the following aspects:

[0035] 1. Dependence of protection function on control logic

[0036] Fault detection and identification: The protection function first needs to detect and identify the fault of the flexible DC protection system by monitoring the parameters of the flexible DC protection system (such as current, voltage, temperature, etc.). The monitoring of these parameters usually shares the same sensors and data acquisition system as the control logic. Once a fault is detected, the flexible DC protection system will trigger the corresponding protection action. The execution of these actions often depends on the support of the control logic, such as cutting off the circuit corresponding to the fault and adjusting the operation mode of the flexible DC protection system.

[0037] Coordination of protection actions and control strategies: The execution of protection actions needs to be coordinated with the current control strategy to ensure that the flexible DC protection system can quickly and smoothly return to normal after a fault. For example, in a flexible DC transmission system, when a fault is detected on the DC side, the flexible DC protection system may trigger the blocking action of the converter station. At this time, the control logic needs to quickly adjust the operation mode of other converter stations to maintain the stability of the flexible DC protection system.

[0038] 2. Control logic supports protection functions

[0039] Optimize the operation of the flexible DC protection system: The control logic optimizes the operating efficiency and stability of the flexible DC protection system by adjusting various parameters of the flexible DC protection system (such as voltage, current, power, etc.). This adjustment process also includes the prevention and early warning of potential faults, thereby reducing the probability of system failure. For example, in a flexible DC transmission system, by adjusting the modulation ratio and phase shift angle of the converter in real time, precise control of DC voltage and power can be achieved, while also reducing harmonic content and converter losses.

[0040] Fast recovery after fault: When a fault occurs in the flexible DC protection system, the control logic needs to respond quickly and adjust the system operation mode to minimize the impact of the fault on the flexible DC protection system. This adjustment process usually includes redistributing power and adjusting system parameters such as voltage and current to ensure that the flexible DC protection system can quickly recover to normal after the fault. At the same time, the control logic also needs to work closely with the protection flexible DC protection system to complete the system recovery work after the fault. For example, after the DC side fault is cleared, the control logic needs to gradually unlock the converter station and restore the normal operation of the flexible DC protection system.

[0041] In S100 of this embodiment, the coupling relationship is divided according to the control and protection device of the flexible direct current transmission project and its control and protection object. The coupling relationship between the flexible direct current protection function execution and the flexible direct current control logic is divided into three parts: system level, converter valve level and submodule level. Among them, the object of the system-level control and protection device is the flexible direct current system, and the whole project is protected without dead zones by dividing different protection partitions. The object of the converter valve-level control and protection device is the converter valve body, which is used to control and protect the converter valve body and handle converter valve-level faults; the object of the submodule-level control and protection device is the basic power unit submodule of the converter valve, which is used to control and protect the submodule body, including at least IGBT, resistor and capacitor power devices. Since the flexible direct current control and protection have coupling relationships at all levels, in order to better and more effectively clarify the coupling relationship between control and protection, the present invention divides the coupling relationship of control and protection into the above three levels and analyzes them.

[0042] S200. Based on the coupling relationship, the flexible DC control signal related to the execution of the flexible DC protection function is screened from the flexible DC control logic; specifically, the flexible DC control signal related to the execution of the flexible DC protection function is screened from the flexible DC control logic, and the flexible DC control signals required for the execution of the flexible DC protection function at the system level, the converter valve level, and the submodule level are respectively clarified. The specific method of screening includes: based on the flexible DC control protection program logic, the control signal required by the action logic of the flexible DC protection at each level is extracted, the action logic of the flexible DC protection is associated with the control logic, and when the action logic of the flexible DC protection reaches the trigger condition, it is continued to judge whether the received control signal meets the requirements, such as whether the protection is in operation, whether the protection outlet needs to switch the main and standby control systems before execution, etc. The flexible DC control signal related to the flexible DC protection function is screened.

[0043] In S200 of this embodiment, based on the coupling relationship, flexible DC control signals related to the execution of the flexible DC protection function are screened from the flexible DC control logic, including flexible DC control signals required for the execution of the flexible DC protection function at three levels: system level, converter valve level and sub-module level. At the system level, the flexible DC control signal at least includes a flexible DC protection device enable signal, a sampling unit enable signal, a flexible DC converter valve unlocking signal, and a flexible DC system control device main signal issued by the flexible DC system control device.

[0044] At the converter valve level, the flexible DC control signal includes at least the instantaneous value signal of the bridge arm current provided by the flexible DC converter valve control device, the main invalid signal of the flexible DC system control device, the bypass quantity signal of the flexible DC converter valve submodule, the bypass switch refusal quantity signal of the flexible DC converter valve submodule, the temporary locking signal of the flexible DC converter valve, and the switching feedback signal of the flexible DC converter valve control device.

[0045] At the sub-module level, the flexible DC control signal includes at least the capacitor voltage signal, power semiconductor device voltage signal, energy supply signal, communication status signal, bypass switch operation status signal, and sub-module operation status signal provided by the flexible DC converter valve sub-module control device.

[0046] S300. According to the flexible DC control signal related to the execution of the flexible DC protection function selected from the flexible DC control logic, simulate the target flexible DC control signal sent by the flexible DC control device to the flexible DC protection device; receive the protection action signal and related information returned by the flexible DC protection device to implement the on-site test of the flexible DC protection.

[0047] Specifically, in this embodiment, a flexible DC protection field test device is developed, which is used to simultaneously simulate the sampling unit and the flexible DC control device, send the flexible DC transmission project operation status information to the flexible DC protection device, and receive the protection action signal and related information returned by the flexible DC protection device.

[0048] In S300 of this embodiment, based on screening out the flexible DC control signal related to the execution of the flexible DC protection function from the flexible DC control logic, simulating the target flexible DC control signal sent by the flexible DC control device to the flexible DC protection device, specifically includes: simulating the sampling signal of the flexible DC transmission project sent by the sampling unit to the flexible DC protection device according to the communication protocol of the sampling unit adopted by the flexible DC transmission project; and simulating the target flexible DC control signal sent by the flexible DC control device to the flexible DC protection device according to the screened flexible DC control signal related to the flexible DC protection function.

[0049] The communication protocol of the sampling unit used in the flexible DC transmission project varies due to differences in manufacturers and technical routes. In this embodiment, it includes:

[0050] 1) Flexible DC protection and AC analog input: simulate conventional transformers and output AC analog sampling values ​​to the flexible DC protection system and its measurement interface device.

[0051] 2) Flexible DC protection and switch input / output: simulate local switches / knife switches, send switch / knife switch opening and closing position signals to the flexible DC protection system, and receive tripping / closing commands.

[0052] 3) Digital input of flexible DC protection and merging unit MU: Optical fiber serial output interface for the FT3 sampling value output of flexible DC, and the output protocol and sampling frequency of each interface can be configured to simulate the electronic transformer output through MU, and output digital sampling values ​​to the flexible DC protection system and its measurement interface device.

[0053] 4) Flexible DC protection and control signal: simulates the control system, outputs operating status information to the UHV DC protection system, and receives the action signal of the flexible DC protection system.

[0054] 5) Flexible DC protection and DC voltage input: For the DC voltage divider, zero flux current transformer, etc., which do not pass through the MU but are directly connected to the measurement interface device in the form of DC voltage analog, the simulated DC voltage divider, zero flux current transformer, etc. directly output analog sampling values ​​to the flexible DC protection system and its measurement interface device.

[0055] In this embodiment, a protection action signal and related information returned by a flexible DC protection device are received, and the protection action signal and related information at least include whether the flexible DC protection is executed, the overall execution time of the flexible DC protection, and the execution lag time of the flexible DC protection. For the functional performance detection of the protection, whether the action is executed correctly, the time consumption of the action, and the delay of the action execution are the basic contents of the detection. The present invention relates to an on-site detection technology for flexible DC protection, and the protection action signal and related information are necessary to determine whether the functional performance of the flexible DC protection meets the requirements.

[0056] The present embodiment discloses a method for on-site testing of a flexible DC protection system, including: parsing the flexible DC protection system architecture, parsing to obtain the coupling relationship between the execution of the flexible DC protection function and the flexible DC control logic; based on the coupling relationship, screening the flexible DC control signal related to the execution of the flexible DC protection function from the flexible DC control logic; simulating the target flexible DC control signal sent by the flexible DC control device to the flexible DC protection device according to the flexible DC control signal related to the execution of the flexible DC protection function screened from the flexible DC control logic; receiving the protection action signal and related information returned by the flexible DC protection device, and realizing on-site testing of the flexible DC protection. The present invention can carry out comprehensive testing of the performance of the flexible DC protection function at the site of the flexible DC transmission project, breaking through the limitation that the current flexible DC protection testing can only be carried out in the laboratory relying on the digital-analog hybrid simulation system, and filling the gap in the on-site testing technology of the flexible DC protection.

[0057] Example 2

[0058] Based on the same inventive concept, an embodiment of the present disclosure also provides an electronic device. Figure 2 FIG. 1 is a schematic diagram of the structure of an electronic device according to an embodiment of the present disclosure. Figure 2 As shown, an embodiment of the present disclosure provides an electronic device including: one or more processors 101, a memory 102, and one or more I / O interfaces 103. The memory 102 stores one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement any optimization method in the above embodiments; the one or more I / O interfaces 103 are connected between the processor and the memory, and are configured to implement information interaction between the processor and the memory.

[0059] Among them, the processor 101 is a device with data processing capabilities, including but not limited to a central processing unit (CPU), etc.; the memory 102 is a device with data storage capabilities, including but not limited to random access memory (RAM, more specifically SDRAM, DDR, etc.), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory (FLASH); the I / O interface (read-write interface) 103 is connected between the processor 101 and the memory 102, and can realize information interaction between the processor 101 and the memory 102, including but not limited to a data bus (Bus), etc.

[0060] In some embodiments, the processor 101 , the memory 102 , and the I / O interface 103 are connected to each other via a bus 104 , and further connected to other components of the computing device.

[0061] In some embodiments, the one or more processors 101 include a field programmable gate array.

[0062] According to an embodiment of the present disclosure, a computer-readable medium is further provided, wherein a computer program is stored on the computer-readable medium, wherein when the program is executed by a processor, the steps in any optimization method in the above-mentioned embodiment are implemented.

[0063] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0064] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0065] Those skilled in the art will also appreciate that the various illustrative logic blocks, modules, circuits, and algorithmic steps described in conjunction with the embodiments herein can all be implemented as electronic hardware, computer software, or a combination thereof. In order to clearly illustrate the interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above around their functions. Whether such functions are implemented as hardware or software depends on specific applications and the design constraints imposed on the entire system. A skilled person can implement the described functions in an alternative manner for each specific application, but such implementation decisions should not be interpreted as departing from the scope of protection of the present disclosure.

[0066] The steps of the method or algorithm described in conjunction with the embodiments herein may be directly embodied as hardware, a software module executed by a processor, or a combination thereof. The software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a mobile disk, a CD-ROM, or any other form of storage medium well known in the art. An exemplary storage medium is connected to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Of course, the storage medium may also be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The ASIC may be located in a user terminal. Of course, the processor and the storage medium may also be present in a user terminal as discrete components.

[0067] For software implementation, the techniques described in this application can be implemented with modules (e.g., procedures, functions, etc.) that perform the functions described in this application. These software codes can be stored in a memory unit and executed by a processor. The memory unit can be implemented within the processor or outside the processor. In the latter case, it is coupled to the processor in a communication manner via various means, which are well known in the art.

[0068] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. A field test method for a flexible DC protection system, characterized in that: include: S100. Analyze the flexible DC protection system architecture to obtain the target coupling relationship between the flexible DC protection function execution and the flexible DC control logic; S200. Based on the target coupling relationship, screening flexible DC control signals related to the execution of flexible DC protection functions from the flexible DC control logic; S300. According to the flexible DC control signal related to the execution of the flexible DC protection function obtained by screening, simulate the target flexible DC control signal sent by the flexible DC control device to the flexible DC protection device; receive the protection action signal and related information returned by the flexible DC protection device, and determine the information to be tested of the flexible DC protection system according to the target flexible DC control signal and the protection action signal.

2. In the field testing method of a flexible DC protection system according to claim 1, in S100, the flexible DC protection system architecture is parsed to obtain a target coupling relationship between the flexible DC protection function execution and the flexible DC control logic, including: The flexible DC protection system architecture is analyzed to determine the control protection device of the flexible DC transmission project and the control and protection object of the control protection device in the flexible DC protection system architecture; based on the control protection device of the flexible DC transmission project and the control and protection object thereof, the target coupling relationship between the execution of the flexible DC protection function and the flexible DC control logic is determined, and the target coupling relationship is one of the system level, the converter valve level and the sub-module level.

3. The on-site testing method of a flexible DC protection system according to claim 2, characterized in that: When the object of the control and protection device is a flexible DC protection system, the target coupling relationship is at the system level; when the object of the control and protection device is a converter valve body, the target coupling relationship is at the converter valve level; when the object of the control and protection device is a basic power unit submodule of the converter valve, the target coupling relationship is at the submodule level, and the basic power unit submodule includes at least IGBT, resistor and capacitor power devices.

4. The on-site testing method of a flexible DC protection system according to claim 2, characterized in that: In S200, based on the target coupling relationship, a flexible DC control signal related to the execution of a flexible DC protection function is screened from the flexible DC control logic. The specific method includes: combing through the action logics of all flexible DC protections, and based on the target coupling relationship, screening the target action logic corresponding to the target coupling relationship from the action logics of all flexible DC protections; and determining, according to the target action logic, a flexible DC control signal related to the execution of a flexible DC protection function corresponding to the target action logic.

5. The on-site testing method of a flexible DC protection system according to claim 2, characterized in that: In S200, based on the target coupling relationship, a flexible DC control signal related to the execution of the flexible DC protection function is screened from the flexible DC control logic, including: when the target coupling relationship is at the system level, the flexible DC control signal includes a flexible DC protection device enable signal, a sampling unit enable signal, a flexible DC converter valve unlock signal, and a flexible DC system control device main signal issued by the flexible DC system control device; When the target coupling relationship is the converter valve level, the flexible DC control signal at least includes the instantaneous value signal of the bridge arm current provided by the flexible DC converter valve control device, the main invalid signal of the flexible DC system control device, the bypass quantity signal of the flexible DC converter valve submodule, the bypass switch refusal quantity signal of the flexible DC converter valve submodule, the temporary locking signal of the flexible DC converter valve, and the switching feedback signal of the flexible DC converter valve control device. When the target coupling relationship is the converter valve level, the flexible DC control signal includes at least a capacitor voltage signal, a power semiconductor device voltage signal, an energy supply signal, a communication status signal, a bypass switch operation status signal, and a submodule operation status signal provided by the flexible DC converter valve submodule control device.

6. The on-site testing method of a flexible DC protection system according to claim 1, characterized in that: In S300, based on the flexible DC control signal related to the execution of the flexible DC protection function screened out from the flexible DC control logic, the target flexible DC control signal sent by the flexible DC control device to the flexible DC protection device is simulated, specifically including: according to the communication protocol of the sampling unit adopted by the flexible DC transmission project, simulating the sampling signal of the flexible DC transmission project sent by the sampling unit to the flexible DC protection device; based on the screened flexible DC control signal related to the flexible DC protection function, simulating the target flexible DC control signal sent by the flexible DC control device to the flexible DC protection device.

7. The on-site testing method of a flexible DC protection system according to claim 1, characterized in that: In S300, the protection action signal includes whether the flexible DC protection is executed and the overall execution time of the flexible DC protection; and the relevant information includes the execution hysteresis time of the flexible DC protection.

8. An electronic device, comprising: one or more processors; A memory for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the DC protection on-site testing method in claims 1-7.

9. A field test system for a flexible DC protection system, characterized in that: include: Target coupling relationship analysis unit, flexible DC control signal screening unit and DC protection system control unit; wherein: A target coupling relationship analysis unit is used to analyze the flexible DC protection system architecture to obtain the target coupling relationship between the flexible DC protection function execution and the flexible DC control logic; A flexible DC control signal screening unit, configured to screen a flexible DC control signal related to the execution of a flexible DC protection function from the flexible DC control logic based on the target coupling relationship; The DC protection system control unit simulates the target flexible DC control signal sent by the flexible DC control device to the flexible DC protection device based on the flexible DC control signal related to the execution of the flexible DC protection function selected from the flexible DC control logic; receives the protection action signal and related information returned by the flexible DC protection device to realize on-site testing of the flexible DC protection.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the on-site testing method of the flexible DC protection system according to any one of claims 1 to 7 is implemented.

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