Verification optimization method and device of flexible low-frequency power transmission system and electronic device

Abstract

The application provides a flexible low-frequency power transmission system verification optimization method and device and electronic device. The method comprises the following steps: receiving target operation data of a semi-physical simulation platform, the semi-physical simulation platform being constructed based on at least a target power grid obtained through simulation and an actual power system device; verifying and optimizing the control protection strategy of the semi-physical simulation platform by analyzing the target operation data; and repeating the receiving step and the verifying and optimizing step at least once in sequence until the performance index of the control protection strategy meets the preset protection index, if the current performance index of the control protection strategy does not meet the preset protection index, the preset protection index comprising at least one of a preset cut-off time and a preset cut-off current, thereby solving the problem that there is no semi-physical verification method in the prior art to verify and optimize the flexible low-frequency power transmission technology under the offshore wind power transmission scenario.

Description

Technical Field

[0001] This application relates to the field of flexible low-frequency power transmission technology, and more specifically, to a verification and optimization method, apparatus, computer-readable storage medium, and electronic device for a flexible low-frequency power transmission system. Background Technology

[0002] For medium- and long-distance offshore wind power transmission, low-frequency AC transmission technology, as a highly competitive solution, has received widespread attention from academic and industrial communities both domestically and internationally in recent years. By reducing the transmission frequency of the offshore AC system, not only can the current-carrying capacity of the AC submarine cable be increased, but the charging current of the cable can also be reduced, thus significantly increasing the transmission distance. Simultaneously, the elimination of the need for offshore converter stations greatly reduces construction and maintenance costs, making it a promising technology for grid connection of deep-sea wind farms in the future.

[0003] Current research on flexible low-frequency power transmission technology mainly focuses on theoretical research, laboratory prototypes, and medium- and low-voltage scenarios. For offshore wind power transmission scenarios, the construction technology, system control and protection technology, and key equipment development of flexible low-frequency power transmission systems are all unprecedented in the world, making them innovative but also more challenging.

[0004] Before constructing large-scale low-frequency transmission projects for connecting large-capacity offshore wind power to the onshore grid, it is necessary to build low-voltage, small-capacity dynamic simulation test platforms and real-world verification platforms to fully verify the construction scheme, operating principle, and core equipment technology of the offshore wind power flexible low-frequency transmission system, laying the foundation for the future large-scale application of flexible low-frequency technology to achieve medium- and long-distance wind power grid connection. Summary of the Invention

[0005] The main objective of this application is to provide a verification and optimization method, apparatus, computer-readable storage medium, and electronic device for a flexible low-frequency power transmission system, so as to at least solve the problem of the lack of a hardware-based verification method in the prior art for verifying and optimizing flexible low-frequency power transmission technology in offshore wind power transmission scenarios.

[0006] To achieve the above objectives, according to one aspect of this application, a verification and optimization method for a flexible low-frequency transmission system is provided, comprising: a receiving step, receiving target operating data from a hardware-in-the-loop (HIL) simulation platform, wherein the HIL is constructed based at least on a simulated target power grid and actual power system equipment, and the target operating data is obtained by simulating a target simulation scenario through the HIL, the target operating data including fault recording data and power grid operating data; a verification and optimization step, analyzing the target operating data to verify and optimize the control and protection strategy of the HIL, the control and protection strategy including power control, frequency control, overvoltage control, overcurrent protection, and redundant system control; and a repeating step, wherein if the current performance index of the control and protection strategy does not meet a preset protection index, the receiving step and the verification and optimization step are repeated at least once in sequence until the performance index of the control and protection strategy meets the preset protection index, the preset protection index including at least one of the following: preset disconnection time and preset disconnection current.

[0007] Optionally, the hardware-in-the-loop simulation platform includes: a data acquisition device that communicates with the simulated target power grid, wind turbine, AC / DC converter, AC filter, shunt reactor, and transformer, respectively, and the data acquisition device is used to acquire power grid operation data of the simulated target power grid, wind turbine, AC / DC converter, AC filter, shunt reactor, and transformer; an AC-side monitoring and protection device that communicates with the data acquisition device, and the AC-side monitoring and protection device is used to receive the AC-side power grid operation data acquired by the data acquisition device; and a DC-side monitoring and control device that communicates with the data acquisition device, and the DC-side monitoring and control device is used to receive AC fault information sent by the data acquisition device, and the AC fault information is used to characterize the faults of the AC-side monitoring and protection device.

[0008] Optionally, the AC-side monitoring and protection device includes: a low-frequency AC-side station control device, communicating with the data acquisition device, the low-frequency AC-side station control device being used to receive low-frequency AC-side power grid operation data sent by the data acquisition device; a power frequency AC-side station control device, communicating with the data acquisition device, the power frequency AC-side station control device being used to receive power frequency AC-side power grid operation data sent by the data acquisition device; a power frequency AC protection device, communicating with the power frequency AC-side station control device, the power frequency AC protection device being used to trigger protection actions based on power frequency protection signals sent by the power frequency AC-side station control device; and a low-frequency AC protection device, communicating with the low-frequency AC-side station control device, the low-frequency AC protection device being used to trigger protection actions based on low-frequency protection signals sent by the low-frequency AC-side station control device.

[0009] Optionally, the DC-side monitoring and control device includes: a DRU-MMC AC converter for communicating with the DC station control equipment; an M3C AC converter for communicating with the DC station control equipment; and the DC station control equipment for communicating with the data acquisition device. The DC station control equipment receives AC fault information sent by the data acquisition device and monitors the DRU-MMC and M3C AC converters. The DC station control equipment is also used to perform [further actions] based on the received AC fault information and [other actions] on the DRU-MMC AC converter. The monitored power grid operation data is used to control the DRU-MMC AC converter, and the M3C AC converter is also controlled based on the received AC fault information and the power grid operation data monitored by the M3C AC converter. A fault recorder communicates with the DC station control equipment, the DRU-MMC AC converter, and the M3C AC converter, respectively, and the fault recorder is used to collect fault ripple data of the DC station control equipment, the DRU-MMC AC converter, and the M3C AC converter.

[0010] Optionally, the hardware-in-the-loop simulation platform further includes: a monitoring device that communicates with the data acquisition device, the AC-side monitoring and protection device, and the DC-side monitoring and control device to monitor the data acquisition device, the AC-side monitoring and protection device, and the DC-side monitoring and control device; and a time synchronization device that communicates with the data acquisition device, the AC-side monitoring and protection device, and the DC-side monitoring and control device to send clock signals to the data acquisition device, the AC-side monitoring and protection device, and the DC-side monitoring and control device for monitoring, so as to ensure the time synchronization of the entire hardware-in-the-loop simulation platform.

[0011] Optionally, the target operating data is analyzed to verify and optimize the control and protection strategy of the hardware-in-the-loop (HIL) platform, including at least one of the following: analyzing the target operating data to obtain the cut-off action time of the control and protection strategy of the HIL platform; if the cut-off action time does not meet the preset cut-off action time, optimizing the control and protection strategy of the HIL platform; the cut-off action time is the cut-off action time when the HIL platform malfunctions; analyzing the target operating data to obtain the cut-off current of the control and protection strategy of the HIL platform; if the cut-off current does not meet the preset cut-off current, optimizing the control and protection strategy of the HIL platform; the cut-off current is the cut-off current when the HIL platform malfunctions.

[0012] Optionally, the verification optimization method further includes: determining that the AC side monitoring and protection device has a fault if the waveform of the fault recording data of the AC side monitoring and protection device is not a sine wave; and determining that the DC side monitoring and control device has a fault if the waveform of the fault recording data of the DC side monitoring and control device is not a DC waveform.

[0013] According to another aspect of this application, a verification and optimization device for a flexible low-frequency transmission system is provided, comprising: a receiving unit, configured to perform a receiving step, receiving target operating data from a hardware-in-the-loop (HIL) platform, wherein the HIL platform is constructed based at least on a simulated target power grid and actual power system equipment, and the target operating data is obtained by simulating a target simulation scenario through the HIL platform, the target operating data including fault recording data and power grid operating data; a verification and optimization unit, configured to perform a verification and optimization step, analyzing the target operating data to verify and optimize the control and protection strategy of the HIL platform, the control and protection strategy including power control, frequency control, overvoltage control, overcurrent protection, and redundant system control; and a repetition unit, configured to perform a repetition step, wherein if the current performance index of the control and protection strategy does not meet a preset protection index, the receiving step and the verification and optimization step are repeated at least once in sequence until the performance index of the control and protection strategy meets the preset protection index, the preset protection index including at least one of the following: preset disconnection time and preset disconnection current.

[0014] According to another aspect of this application, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform any of the verification and optimization methods for the flexible low-frequency transmission system described above.

[0015] According to another aspect of this application, an electronic device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute any of the verification and optimization methods for the flexible low-frequency power transmission system described above through the computer program.

[0016] The technical solution of this application first receives target operating data obtained by simulating a target simulation scenario using a hardware-in-the-loop (HIL) platform. Then, the received target operating data is analyzed to verify and optimize the control and protection strategy of the HIL platform. Finally, if the current performance indicators of the control and protection strategy do not meet the preset protection indicators, the receiving and verification / optimization steps are repeated at least once until the performance indicators of the corresponding control and protection strategy meet the preset protection indicators. This solution uses a HIL platform to simulate different target simulation scenarios and obtain target operating data. Based on this data, the control and protection strategy of the flexible low-frequency transmission system is comprehensively verified and optimized, thus solving the problem of the lack of a hardware-in-the-loop verification method in the prior art for verifying and optimizing flexible low-frequency transmission technology in offshore wind power transmission scenarios. This solution not only effectively reduces testing costs and time but also improves the safety and stability of the flexible low-frequency transmission system. Furthermore, the HIL platform of this application can be applied not only to the design and testing phases of new flexible low-frequency transmission systems but also to the retrofitting and optimization of existing flexible low-frequency transmission systems, demonstrating high practical application value. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0018] Figure 1 A hardware structure block diagram of a mobile terminal for implementing a verification optimization method for a flexible low-frequency power transmission system according to an embodiment of this application is shown.

[0019] Figure 2 A flowchart illustrating a verification and optimization method for a flexible low-frequency transmission system according to an embodiment of this application is shown.

[0020] Figure 3 A structural diagram of a hardware-in-the-loop simulation platform provided according to an embodiment of this application is shown;

[0021] Figure 4 A flowchart is shown for another verification and optimization method for a flexible low-frequency transmission system provided according to an embodiment of this application;

[0022] Figure 5 A schematic diagram of the structure of a verification and optimization device for a flexible low-frequency power transmission system provided according to an embodiment of this application is shown.

[0023] The above figures include the following reference numerals:

[0024] 102. Processor; 104. Memory; 106. Transmission equipment; 108. Input / output device; 100. Data acquisition device; 200. DC side monitoring and control device; 201. Fault recorder; 202. DRU-MMC AC converter; 203. DC station control equipment; 204. M3C AC converter; 300. AC side monitoring and protection device; 301. Low-frequency AC protection equipment; 302. Low-frequency AC side station control equipment; 303. Power frequency AC side station control equipment; 304. Power frequency AC protection equipment; 400. Power system equipment; 500. Monitoring equipment; 600. Time synchronization equipment. Detailed Implementation

[0025] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0026] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0027] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0028] As described in the background section, the existing technology lacks a semi-physical verification method to verify and optimize flexible low-frequency power transmission technology in offshore wind power transmission scenarios. To solve the above problems, embodiments of this application provide a verification and optimization method, apparatus, computer-readable storage medium, and electronic device for a flexible low-frequency power transmission system.

[0029] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0030] The methods and embodiments provided in this application can be executed on a mobile terminal, computer terminal, or similar computing device. Taking running on a mobile terminal as an example, Figure 1 This is a hardware structure block diagram of a mobile terminal for a verification and optimization method of a flexible low-frequency power transmission system according to an embodiment of the present invention. Figure 1 As shown, a mobile terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 (which may include, but is not limited to, a microprocessor MCU or a programmable logic device FPGA, etc.) and a memory 104 for storing data are also shown. The mobile terminal may further include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that... Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the mobile terminal described above. For example, the mobile terminal may also include components that are more... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown.

[0031] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the verification and optimization method of the flexible low-frequency power transmission system in this embodiment of the invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the mobile terminal via a network. Examples of the aforementioned networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof. The transmission device 106 is used to receive or send data via a network. Specific examples of the aforementioned networks may include wireless networks provided by the mobile terminal's communication provider. In one example, the transmission device 106 includes a network interface controller (NIC), which can be connected to other network devices via a base station to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0032] This embodiment provides a verification and optimization method for a flexible low-frequency power transmission system that runs on a mobile terminal, computer terminal, or similar computing device. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Also, although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than that shown here.

[0033] Figure 2 This is a flowchart of a verification and optimization method for a flexible low-frequency power transmission system according to an embodiment of this application. Figure 2 As shown, the verification optimization method includes the following steps:

[0034] Step S201, receiving step, receiving target operation data from a hardware-in-the-loop simulation platform, wherein the hardware-in-the-loop simulation platform is constructed based at least on a target power grid obtained through simulation and actual power system equipment, and the target operation data is obtained by simulating the target simulation scenario through the hardware-in-the-loop simulation platform, and the target operation data includes fault recording data and power grid operation data.

[0035] In one specific embodiment, the target power grid obtained through simulation is a simulation of the target power grid using simulation software, and the simulated target power grid is then connected to the actual power system equipment. In practical applications, the target power grid can be an offshore wind power grid.

[0036] The aforementioned target simulation scenarios can be conventional operating condition simulation scenarios, simulation scenarios under different load fluctuations, wind farm single-phase-to-ground short circuit simulation scenarios, DC system grounding simulation scenarios, and target grid fault simulation scenarios, etc. Of course, it does not include the conventional operating condition simulation scenarios, simulation scenarios under different load fluctuations, wind farm single-phase-to-ground short circuit simulation scenarios, DC system grounding simulation scenarios, and target grid fault simulation scenarios mentioned above; it can also be other scenarios that require verification and optimization, and this application does not impose any limitations on this.

[0037] Specifically, the aforementioned power grid operation data can be electrical data such as current, voltage, and power.

[0038] Step S202, verification and optimization step, analyze the above target operating data to verify and optimize the control and protection strategy of the above semi-physical simulation platform. The control and protection strategy includes power control, frequency control, overvoltage control, overcurrent protection and redundant system control.

[0039] Specifically, the target operating data is analyzed to verify and optimize the control and protection strategy of the hardware-in-the-loop simulation platform. This involves analyzing the target operating data of the hardware-in-the-loop simulation platform in the target simulation scenario to determine whether the control and protection strategy in the target simulation scenario plays its corresponding role and whether it meets the corresponding preset protection indicators, and then optimizing the control and protection strategy in the target simulation scenario.

[0040] Step S203: Repeat the steps. If the current performance index of the above control and protection strategy does not meet the preset protection index, repeat the above receiving step and the above verification and optimization step at least once in sequence until the performance index of the above control and protection strategy meets the preset protection index. The preset protection index includes at least one of the following: preset cut-off time and preset cut-off current.

[0041] In practical applications, the preset protection indicators in step S203 are not limited to preset cut-off time and / or preset cut-off current, etc., but can also be preset cut-off voltage and other electrical data indicators.

[0042] This embodiment first receives target operating data obtained by simulating a target scenario using a hardware-in-the-loop (HIL) platform. Then, it analyzes the received target operating data to verify and optimize the control and protection strategy of the HIL platform. Finally, if the current performance indicators of the control and protection strategy do not meet the preset protection indicators, the receiving and verification / optimization steps are repeated at least once until the performance indicators of the corresponding control and protection strategy meet the preset protection indicators. This solution uses a HIL platform to simulate different target scenarios and obtain target operating data. Based on this data, the control and protection strategy of the flexible low-frequency transmission system is comprehensively verified and optimized, thus solving the problem of the lack of a hardware-in-the-loop verification method in the prior art for verifying and optimizing flexible low-frequency transmission technology in offshore wind power transmission scenarios. This solution not only effectively reduces testing costs and time but also improves the safety and stability of the flexible low-frequency transmission system. Furthermore, the HIL platform of this application can be applied not only to the design and testing phases of new flexible low-frequency transmission systems but also to the retrofitting and optimization of existing flexible low-frequency transmission systems, demonstrating high practical application value.

[0043] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0044] To better realize various control and protection functions, and to further improve the reliability and stability of the flexible low-frequency transmission system, the specific implementation process includes, for example: Figure 3 As shown, the hardware-in-the-loop simulation platform in step S201 includes:

[0045] The data acquisition device 100 communicates with the simulated target power grid, wind turbine, AC converter, AC-DC converter, AC filter, shunt reactor, and transformer, respectively. The data acquisition device 100 is used to acquire the simulated power grid operation data of the target power grid, wind turbine, AC converter, AC-DC converter, AC filter, shunt reactor, and transformer.

[0046] The AC side monitoring and protection device 300 communicates with the aforementioned data acquisition device 100. The AC side monitoring and protection device 300 is used to receive the AC side power grid operation data collected by the aforementioned data acquisition device 100.

[0047] The DC side monitoring and control device 200 communicates with the data acquisition device 100. The DC side monitoring and control device 200 is used to receive AC fault information sent by the data acquisition device 100. The AC fault information is used to characterize the fault of the AC side monitoring and protection device.

[0048] In the above embodiments, the established hardware-in-the-loop simulation platform is modular and scalable, which allows for platform expansion and upgrades according to different flexible low-frequency power transmission systems and engineering requirements.

[0049] Additionally, it should be noted that, for the sake of simplification... Figure 3 , Figure 3 The power system equipment 400 in the simulation includes the target power grid, wind turbines, AC / DC converters, AC filters, shunt reactors, and transformers, etc. Of course, additional equipment can be added according to actual verification and simulation needs. Figure 3 The power system equipment 400 in the simulation can be flexibly adjusted, and is not limited to the target power grid, wind turbines, AC converters, AC-DC converters, AC filters, shunt reactors and transformers mentioned above.

[0050] Specifically, in the above embodiments, the data acquisition device can perform data acquisition and processing in real time, thereby further ensuring the data accuracy and real-time performance of the hardware-in-the-loop simulation platform, and thus better analyzing and optimizing the control and protection strategies of the low-frequency power transmission system.

[0051] like Figure 3 As shown, the AC-side monitoring and protection device 300 of this application includes:

[0052] The low-frequency AC side station control equipment 302 communicates with the data acquisition device 100. The low-frequency AC side station control equipment 302 is used to receive the low-frequency AC side power grid operation data sent by the data acquisition device 100. After receiving the low-frequency AC side power grid operation data, the low-frequency AC side station control equipment 302 can also generate a low-frequency protection signal based on the low-frequency AC side power grid operation data and send it to the low-frequency AC protection equipment 301.

[0053] The power frequency AC side station control equipment 303 communicates with the aforementioned data acquisition device 100. The power frequency AC side station control equipment 303 is used to receive the power grid operation data on the power frequency AC side sent by the aforementioned data acquisition device 100. After receiving the power grid operation data on the power frequency AC side, the power frequency AC side station control equipment 303 can also generate a power frequency protection signal based on the power grid operation data on the power frequency AC side and send it to the power frequency AC protection equipment 304.

[0054] The power frequency AC protection device 304 communicates with the power frequency AC side station control device 303. The power frequency AC protection device 304 is used to trigger protection action based on the power frequency protection signal sent by the power frequency AC side station control device 303.

[0055] The low-frequency AC protection device 301 communicates with the aforementioned low-frequency AC side station control device 302. The low-frequency AC protection device 301 is used to trigger protection actions based on the low-frequency protection signal sent by the aforementioned low-frequency AC side station control device 302.

[0056] In the above embodiments, a relatively complete control and protection system was built. In addition to realizing basic control functions and verification, it can also verify control and protection strategies for different target simulation scenarios, further ensuring that the simulation results of this scheme are relatively accurate. This provides effective data support for the construction and transformation of actual flexible low-frequency power transmission systems, and further improves the stability of flexible low-frequency power transmission systems.

[0057] Of course, in practical applications, it is not limited to designing control and protection systems for the AC and DC sides on a hardware-in-the-loop simulation platform. It is also possible to design control and protection systems for the low-frequency AC side, thereby further verifying and optimizing the control and protection strategies for the low-frequency AC side.

[0058] To further improve the analysis and verification of the DC side, in one embodiment, such as Figure 3 As shown, the DC-side monitoring and control device 200 includes:

[0059] The DRU-MMC AC converter 202 communicates with the DC station control equipment 203;

[0060] M3C AC converter 204 communicates with the aforementioned DC station control equipment 203;

[0061] The aforementioned DC station control equipment 203 communicates with the aforementioned data acquisition device 100. The aforementioned DC station control equipment 203 is used to receive the aforementioned AC fault information sent by the aforementioned data acquisition device 100, and to monitor the aforementioned DRU-MMC AC converter 202 and M3C AC converter 204. The aforementioned DC station control equipment 203 is used to control the aforementioned DRU-MMC AC converter 202 based on the received aforementioned AC fault information and the power grid operation data obtained by monitoring the aforementioned DRU-MMC AC converter 202, and to control the aforementioned M3C AC converter 204 based on the received aforementioned AC fault information and the power grid operation data obtained by monitoring the aforementioned M3C AC converter 204.

[0062] The fault recorder 201 communicates with the aforementioned DC station control equipment 203, the aforementioned DRU-MMC AC converter 202, and the aforementioned M3C AC converter 204, respectively. The fault recorder 201 is used to collect fault waveform data from the aforementioned DC station control equipment 203, the aforementioned DRU-MMC AC converter 202, and the aforementioned M3C AC converter 204.

[0063] Specifically, the sampling rate of the aforementioned fault recorder is no less than 50kHz, which enables it to accurately capture and record faults and abnormal conditions in the power system.

[0064] Specifically, the aforementioned fault ripple data can be voltage ripple data, current ripple data, power ripple data, and other ripple data related to electrical parameters, but is not limited to the voltage ripple data, current ripple data, and power ripple data mentioned above. Subsequently, the performance of the corresponding control and protection strategies under different operating conditions and fault scenarios can be understood based on the fault ripple data, further enabling a more accurate and effective evaluation of the corresponding control and protection strategies.

[0065] In a specific instance, such as Figure 3 As shown, the aforementioned hardware-in-the-loop simulation platform also includes:

[0066] The monitoring device 500 communicates with the data acquisition device 100, the AC side monitoring and protection device 300 and the DC side monitoring and control device 200 respectively, so as to monitor the data acquisition device 100, the AC side monitoring and protection device 300 and the DC side monitoring and control device 200.

[0067] The time synchronization device 600 communicates with the data acquisition device 100, the AC side monitoring and protection device 300, and the DC side monitoring and control device 200 respectively to send clock signals to the data acquisition device 100, the AC side monitoring and protection device 300, and the DC side monitoring and control device 200 for monitoring, so as to ensure the time synchronization of the entire hardware-in-the-loop simulation platform.

[0068] In the above embodiments, monitoring equipment monitors the data acquisition device, AC-side monitoring and protection device, and DC-side monitoring and control device. Subsequently, based on the real-time status data obtained from monitoring these devices, the control and protection strategies are adjusted and optimized, further improving the stability and safety of the flexible low-frequency transmission system. Secondly, the above embodiments also utilize time synchronization equipment to provide a unified clock signal for the data acquisition device, AC-side monitoring and protection device, and DC-side monitoring and control device, ensuring time synchronization of the entire hardware-in-the-loop simulation platform. Subsequently, based on the collected target operating data, the corresponding control and protection strategies are verified and optimized, further ensuring high accuracy in verifying and optimizing the corresponding control and protection strategies.

[0069] In one specific embodiment of this application, the parameters of the data acquisition device, AC side monitoring and protection device, and DC side monitoring and control device can be set based on the real-time displayed status data obtained by the monitoring equipment monitoring the data acquisition device, AC side monitoring and protection device, and DC side monitoring and control device, thereby further improving the reliability, stability, and security of the power system.

[0070] In practical applications, the various actual power system devices on the hardware-in-the-loop simulation platform in this application can be interconnected via cables and / or optical fibers to achieve data transmission and communication between them.

[0071] Specifically, the aforementioned monitoring equipment can be used to monitor the main equipment, switches, and electrical quantities in the data acquisition device, AC side monitoring and protection device, and DC side monitoring and control device.

[0072] In order to more easily verify and optimize the corresponding control strategy, and to further improve the stability, safety and reliability of the flexible low-frequency transmission system, in some embodiments, the above step S202 can be implemented by one of the following steps:

[0073] Step S2021: Analyze the above target operation data to obtain the cut-off action time of the control and protection strategy of the above semi-physical simulation platform. If the cut-off action time does not meet the preset cut-off action time, optimize the control and protection strategy of the above semi-physical simulation platform. The cut-off action time is the cut-off action time when the above semi-physical simulation platform fails.

[0074] Step S2022: Analyze the above target operating data to obtain the cut-off current of the control and protection strategy of the above hardware-in-the-loop simulation platform. If the cut-off current does not meet the preset cut-off current, optimize the control and protection strategy of the above hardware-in-the-loop simulation platform. The cut-off current is the cut-off current when the above hardware-in-the-loop simulation platform fails.

[0075] In its specific implementation, the verification optimization method of this application further includes steps S204 and S205. Specifically,

[0076] Step S204: If the waveform of the fault recording data of the AC side monitoring and protection device is not a sine wave, it is determined that the AC side monitoring and protection device has malfunctioned.

[0077] Step S205: If the waveform of the fault recording data of the DC side monitoring and control device is not a DC waveform, it is determined that the DC side monitoring and control device has malfunctioned.

[0078] In the above embodiments, the AC side monitoring and protection device and the DC side monitoring and control device are analyzed by using the waveforms of the obtained fault recording data. This makes it relatively easy to analyze whether the AC side monitoring and protection device and the DC side monitoring and control device are faulty.

[0079] In one specific embodiment, when simulating the target simulation scenario using a hardware-in-the-loop simulation platform, sequential control operations can be adopted, and all information during the simulation process can be recorded to facilitate real-time monitoring and debugging of the flexible low-frequency power transmission system.

[0080] In another specific embodiment, the hardware-in-the-loop simulation platform built in this application can realize basic control functions and verification, including but not limited to startup, steady-state operation and fault ride-through control functions, as well as fault ride-through function of low-frequency transmission lines.

[0081] To enable those skilled in the art to better understand the technical solution of this application, the implementation process of the verification and optimization method for the flexible low-frequency power transmission system of this application will be described in detail below with reference to specific embodiments.

[0082] This embodiment relates to a specific verification and optimization method for a flexible low-frequency power transmission system, such as... Figure 3 and Figure 4 As shown, it includes the following steps:

[0083] Step S1: Construct a semi-physical simulation platform, which includes data acquisition devices, AC-side monitoring and protection devices, DC-side monitoring and control devices, monitoring equipment, time synchronization equipment, and power system equipment (the simulated target power grid, wind turbines, AC / DC converters, AC filters, shunt reactors, and transformers). The AC-side monitoring and protection devices include low-frequency AC-side station control equipment, power-frequency AC-side station control equipment, power-frequency AC protection equipment, and low-frequency AC protection equipment. The DC-side monitoring and control devices include DRU-MMC AC / DC converters, M3C AC / DC converters, DC station control equipment, and a fault recorder.

[0084] Step S2: Based on the hardware-in-the-loop simulation platform, simulate the target simulation scenario to obtain the target operation data corresponding to the target simulation scenario.

[0085] Step S3: Analyze the target operation data to verify and optimize the control and protection strategies corresponding to the target simulation scenario.

[0086] Step S4: If the current performance index of the control and protection strategy corresponding to the target simulation scenario does not meet the preset protection index, repeat steps S2 and S3 until the performance index of the control and protection strategy meets the preset protection index. If the current performance index of the control and protection strategy corresponding to the target simulation scenario meets the preset protection index, the process ends.

[0087] Through the above embodiments, it can be seen that the hardware-in-the-loop simulation platform and the verification and optimization method of the flexible low-frequency transmission system of this application can effectively verify and optimize control and protection strategies, and improve the reliability, stability and safety of the flexible low-frequency transmission system.

[0088] In practical engineering applications, the hardware-in-the-loop simulation platform and its verification and optimization methods can be adjusted and optimized according to the structure and requirements of different flexible low-frequency power transmission systems, making them widely applicable and valuable for promotion.

[0089] The hardware-in-the-loop (HILL) simulation platform and its verification and optimization method for flexible low-frequency transmission systems provided in this application can effectively reduce testing costs and time, while improving the safety and stability of flexible low-frequency transmission operation. This HILL simulation platform can be applied not only to the design and testing phases of new flexible low-frequency transmission systems, but also to the retrofitting and optimization of existing flexible low-frequency transmission systems, demonstrating high practical application value.

[0090] This application also provides a verification and optimization apparatus for a flexible low-frequency transmission system. It should be noted that this apparatus can be used to execute the verification and optimization method for flexible low-frequency transmission systems provided in this application. This apparatus is used to implement the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0091] The following describes the verification and optimization device for the flexible low-frequency power transmission system provided in the embodiments of this application.

[0092] Figure 5 This is a schematic diagram of the structure of a verification and optimization device for a flexible low-frequency power transmission system according to an embodiment of this application. Figure 5 As shown, the verification and optimization apparatus includes:

[0093] The receiving unit 10 is used to perform the receiving step and receive the target operation data of the hardware-in-the-loop simulation platform. The hardware-in-the-loop simulation platform is constructed based at least on the target power grid obtained by simulation and the actual power system equipment. The target operation data is obtained by simulating the target simulation scenario through the hardware-in-the-loop simulation platform. The target operation data includes fault recording data and power grid operation data.

[0094] In one specific embodiment, the target power grid obtained through simulation is a simulation of the target power grid using simulation software, and the simulated target power grid is then connected to the actual power system equipment. In practical applications, the target power grid can be an offshore wind power grid.

[0095] The aforementioned target simulation scenarios can be conventional operating condition simulation scenarios, simulation scenarios under different load fluctuations, wind farm single-phase-to-ground short circuit simulation scenarios, DC system grounding simulation scenarios, and target grid fault simulation scenarios, etc. Of course, it does not include the conventional operating condition simulation scenarios, simulation scenarios under different load fluctuations, wind farm single-phase-to-ground short circuit simulation scenarios, DC system grounding simulation scenarios, and target grid fault simulation scenarios mentioned above; it can also be other scenarios that require verification and optimization, and this application does not impose any limitations on this.

[0096] Specifically, the aforementioned power grid operation data can be electrical data such as current, voltage, and power.

[0097] The verification and optimization unit 20 is used to perform verification and optimization steps, analyze the target operation data, and verify and optimize the control and protection strategy of the hardware-in-the-loop simulation platform. The control and protection strategy includes power control, frequency control, overvoltage control, overcurrent protection, and redundant system control.

[0098] Specifically, the target operating data is analyzed to verify and optimize the control and protection strategy of the hardware-in-the-loop simulation platform. This involves analyzing the target operating data of the hardware-in-the-loop simulation platform in the target simulation scenario to determine whether the control and protection strategy in the target simulation scenario plays its corresponding role and whether it meets the corresponding preset protection indicators, and then optimizing the control and protection strategy in the target simulation scenario.

[0099] The repeating unit 30 is used to perform repeating steps. If the current performance index of the above control and protection strategy does not meet the preset protection index, the above receiving step and the above verification and optimization step are repeated at least once in sequence until the performance index of the above control and protection strategy meets the preset protection index. The preset protection index includes at least one of the following: preset cut-off time and preset cut-off current.

[0100] In practical applications, preset protection indicators are not limited to preset cut-off time and / or preset cut-off current, but can also be preset cut-off voltage and other electrical data indicators.

[0101] In this embodiment, the receiving unit receives target operating data obtained by simulating a target simulation scenario using a hardware-in-the-loop (HIL) platform; the verification and optimization unit analyzes the received target operating data to verify and optimize the control and protection strategy of the HIL platform; and the repeating unit repeats the receiving and verification / optimization steps at least once, until the performance indicators of the corresponding control and protection strategy meet the preset protection indicators, if the current performance indicators of the control and protection strategy do not meet the preset protection indicators. This solution uses a HIL platform to simulate different target simulation scenarios and obtain target operating data. Based on this data, the control and protection strategy of the flexible low-frequency transmission system is comprehensively verified and optimized, thus solving the problem of the lack of a hardware-in-the-loop verification method in the prior art for verifying and optimizing flexible low-frequency transmission technology in offshore wind power transmission scenarios. This solution not only effectively reduces testing costs and time but also improves the safety and stability of the flexible low-frequency transmission system. Furthermore, the HIL platform of this application can be applied not only to the design and testing phases of new flexible low-frequency transmission systems but also to the retrofitting and optimization of existing flexible low-frequency transmission systems, demonstrating high practical application value.

[0102] To better realize various control and protection functions, and to further improve the reliability and stability of the flexible low-frequency transmission system, the specific implementation process includes, for example: Figure 3 As shown, the aforementioned hardware-in-the-loop simulation platform includes:

[0103] The data acquisition device 100 communicates with the simulated target power grid, wind turbine, AC converter, AC-DC converter, AC filter, shunt reactor, and transformer, respectively. The data acquisition device 100 is used to acquire the simulated power grid operation data of the target power grid, wind turbine, AC converter, AC-DC converter, AC filter, shunt reactor, and transformer.

[0104] The AC side monitoring and protection device 300 communicates with the aforementioned data acquisition device 100. The AC side monitoring and protection device 300 is used to receive the AC side power grid operation data collected by the aforementioned data acquisition device 100.

[0105] The DC side monitoring and control device 200 communicates with the data acquisition device 100. The DC side monitoring and control device 200 is used to receive AC fault information sent by the data acquisition device 100. The AC fault information is used to characterize the fault of the AC side monitoring and protection device.

[0106] In the above embodiments, the established hardware-in-the-loop simulation platform is modular and scalable, which allows for platform expansion and upgrades according to different flexible low-frequency power transmission systems and engineering requirements.

[0107] Additionally, it should be noted that, for the sake of simplification... Figure 3 , Figure 3 The power system equipment 400 in the simulation includes the target power grid, wind turbines, AC / DC converters, AC filters, shunt reactors, and transformers, etc. Of course, additional equipment can be added according to actual verification and simulation needs. Figure 3 The power system equipment 400 in the simulation can be flexibly adjusted, and is not limited to the target power grid, wind turbines, AC converters, AC-DC converters, AC filters, shunt reactors and transformers mentioned above.

[0108] Specifically, in the above embodiments, the data acquisition device can perform data acquisition and processing in real time, thereby further ensuring the data accuracy and real-time performance of the hardware-in-the-loop simulation platform, and thus better analyzing and optimizing the control and protection strategies of the low-frequency power transmission system.

[0109] like Figure 3 As shown, the AC-side monitoring and protection device 300 of this application includes:

[0110] The low-frequency AC side station control equipment 302 communicates with the data acquisition device 100. The low-frequency AC side station control equipment 302 is used to receive the low-frequency AC side power grid operation data sent by the data acquisition device 100. After receiving the low-frequency AC side power grid operation data, the low-frequency AC side station control equipment 302 can also generate a low-frequency protection signal based on the low-frequency AC side power grid operation data and send it to the low-frequency AC protection equipment 301.

[0111] The power frequency AC side station control equipment 303 communicates with the aforementioned data acquisition device 100. The power frequency AC side station control equipment 303 is used to receive the power grid operation data on the power frequency AC side sent by the aforementioned data acquisition device 100. After receiving the power grid operation data on the power frequency AC side, the power frequency AC side station control equipment 303 can also generate a power frequency protection signal based on the power grid operation data on the power frequency AC side and send it to the power frequency AC protection equipment 304.

[0112] The power frequency AC protection device 304 communicates with the power frequency AC side station control device 303. The power frequency AC protection device 304 is used to trigger protection action based on the power frequency protection signal sent by the power frequency AC side station control device 303.

[0113] The low-frequency AC protection device 301 communicates with the aforementioned low-frequency AC side station control device 302. The low-frequency AC protection device 301 is used to trigger protection actions based on the low-frequency protection signal sent by the aforementioned low-frequency AC side station control device 302.

[0114] In the above embodiments, a relatively complete control and protection system was built. In addition to realizing basic control functions and verification, it can also verify control and protection strategies for different target simulation scenarios, further ensuring that the simulation results of this scheme are relatively accurate. This provides effective data support for the construction and transformation of actual flexible low-frequency power transmission systems, and further improves the stability of flexible low-frequency power transmission systems.

[0115] Of course, in practical applications, it is not limited to designing control and protection systems for the AC and DC sides on a hardware-in-the-loop simulation platform. It is also possible to design control and protection systems for the low-frequency AC side, thereby further verifying and optimizing the control and protection strategies for the low-frequency AC side.

[0116] To further improve the analysis and verification of the DC side, in one embodiment, such as Figure 3 As shown, the DC-side monitoring and control device 200 includes:

[0117] The DRU-MMC AC converter 202 communicates with the DC station control equipment 203;

[0118] M3C AC converter 204 communicates with the aforementioned DC station control equipment 203;

[0119] The aforementioned DC station control equipment 203 communicates with the aforementioned data acquisition device 100. The aforementioned DC station control equipment 203 is used to receive the aforementioned AC fault information sent by the aforementioned data acquisition device 100, and to monitor the aforementioned DRU-MMC AC converter 202 and M3C AC converter 204. The aforementioned DC station control equipment 203 is used to control the aforementioned DRU-MMC AC converter 202 based on the received aforementioned AC fault information and the power grid operation data obtained by monitoring the aforementioned DRU-MMC AC converter 202, and to control the aforementioned M3C AC converter 204 based on the received aforementioned AC fault information and the power grid operation data obtained by monitoring the aforementioned M3C AC converter 204.

[0120] The fault recorder 201 communicates with the aforementioned DC station control equipment 203, the aforementioned DRU-MMC AC converter 202, and the aforementioned M3C AC converter 204, respectively. The fault recorder 201 is used to collect fault waveform data from the aforementioned DC station control equipment 203, the aforementioned DRU-MMC AC converter 202, and the aforementioned M3C AC converter 204.

[0121] Specifically, the sampling rate of the aforementioned fault recorder is no less than 50kHz, which enables it to accurately capture and record faults and abnormal conditions in the power system.

[0122] Specifically, the aforementioned fault ripple data can be voltage ripple data, current ripple data, power ripple data, and other ripple data related to electrical parameters, but is not limited to the voltage ripple data, current ripple data, and power ripple data mentioned above. Subsequently, the performance of the corresponding control and protection strategies under different operating conditions and fault scenarios can be understood based on the fault ripple data, further enabling a more accurate and effective evaluation of the corresponding control and protection strategies.

[0123] In a specific instance, such as Figure 3 As shown, the aforementioned hardware-in-the-loop simulation platform also includes:

[0124] The monitoring device 500 communicates with the data acquisition device 100, the AC side monitoring and protection device 300 and the DC side monitoring and control device 200 respectively, so as to monitor the data acquisition device 100, the AC side monitoring and protection device 300 and the DC side monitoring and control device 200.

[0125] The time synchronization device 600 communicates with the data acquisition device 100, the AC side monitoring and protection device 300, and the DC side monitoring and control device 200 respectively to send clock signals to the data acquisition device 100, the AC side monitoring and protection device 300, and the DC side monitoring and control device 200 for monitoring, so as to ensure the time synchronization of the entire hardware-in-the-loop simulation platform.

[0126] In the above embodiments, monitoring equipment monitors the data acquisition device, AC-side monitoring and protection device, and DC-side monitoring and control device. Subsequently, based on the real-time status data obtained from monitoring these devices, the control and protection strategies are adjusted and optimized, further improving the stability and safety of the flexible low-frequency transmission system. Secondly, the above embodiments also utilize time synchronization equipment to provide a unified clock signal for the data acquisition device, AC-side monitoring and protection device, and DC-side monitoring and control device, ensuring time synchronization of the entire hardware-in-the-loop simulation platform. Subsequently, based on the collected target operating data, the corresponding control and protection strategies are verified and optimized, further ensuring high accuracy in verifying and optimizing the corresponding control and protection strategies.

[0127] In one specific embodiment of this application, the parameters of the data acquisition device, AC side monitoring and protection device, and DC side monitoring and control device can be set based on the real-time displayed status data obtained by the monitoring equipment monitoring the data acquisition device, AC side monitoring and protection device, and DC side monitoring and control device, thereby further improving the reliability, stability, and security of the power system.

[0128] In practical applications, the various actual power system devices on the hardware-in-the-loop simulation platform in this application can be interconnected via cables and / or optical fibers to achieve data transmission and communication between them.

[0129] Specifically, the aforementioned monitoring equipment can be used to monitor the main equipment, switches, and electrical quantities in the data acquisition device, AC side monitoring and protection device, and DC side monitoring and control device.

[0130] To simplify the verification and optimization of the corresponding control strategy and further improve the stability, safety, and reliability of the flexible low-frequency transmission system, in some embodiments, the verification and optimization unit includes a first analysis module and a second analysis module. The first analysis module analyzes the target operating data to obtain the tripping action time of the control and protection strategy of the hardware-in-the-loop (HIL) platform. If the tripping action time does not meet the preset tripping action time, the control and protection strategy of the HIL platform is optimized. The tripping action time is the tripping action time when the HIL platform malfunctions. The second analysis module analyzes the target operating data to obtain the tripping current of the control and protection strategy of the HIL platform. If the tripping current does not meet the preset tripping current, the control and protection strategy of the HIL platform is optimized. The tripping current is the tripping current when the HIL platform malfunctions.

[0131] In a specific implementation, the verification and optimization device of this application further includes a first determining unit and a second determining unit. The first determining unit is used to determine that the AC-side monitoring and protection device has malfunctioned when the waveform of the fault recording data of the AC-side monitoring and protection device is not a sine wave; the second determining unit is used to determine that the DC-side monitoring and control device has malfunctioned when the waveform of the fault recording data of the DC-side monitoring and control device is not a DC waveform.

[0132] In the above embodiments, the AC side monitoring and protection device and the DC side monitoring and control device are analyzed by using the waveforms of the obtained fault recording data. This makes it relatively easy to analyze whether the AC side monitoring and protection device and the DC side monitoring and control device are faulty.

[0133] In one specific embodiment, when simulating the target simulation scenario using a hardware-in-the-loop simulation platform, sequential control operations can be adopted, and all information during the simulation process can be recorded to facilitate real-time monitoring and debugging of the flexible low-frequency power transmission system.

[0134] In another specific embodiment, the hardware-in-the-loop simulation platform built in this application can realize basic control functions and verification, including but not limited to startup, steady-state operation and fault ride-through control functions, as well as fault ride-through function of low-frequency transmission lines.

[0135] The aforementioned verification and optimization device for the flexible low-frequency transmission system includes a processor and a memory. The receiving unit, verification and optimization unit, and repetition unit are all stored as program units in the memory. The processor executes these program units stored in the memory to achieve their respective functions. All of the above modules reside in the same processor; alternatively, the modules may be located in different processors in any combination.

[0136] The processor contains a kernel, which retrieves the corresponding program units from memory. One or more kernels can be configured, and adjusting kernel parameters can address the lack of hardware-in-the-loop (HIL) verification methods in existing technologies for verifying and optimizing flexible low-frequency power transmission technology for offshore wind power transmission scenarios.

[0137] The memory may include non-permanent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM, and the memory includes at least one memory chip.

[0138] This invention provides a computer-readable storage medium including a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the verification and optimization method for the flexible low-frequency power transmission system.

[0139] Specifically, the verification and optimization methods for flexible low-frequency transmission systems include:

[0140] Step S201, receiving step, receiving target operation data from a hardware-in-the-loop simulation platform, wherein the hardware-in-the-loop simulation platform is constructed based at least on a target power grid obtained through simulation and actual power system equipment, and the target operation data is obtained by simulating the target simulation scenario through the hardware-in-the-loop simulation platform, and the target operation data includes fault recording data and power grid operation data.

[0141] Step S202, verification and optimization step, analyze the above target operating data to verify and optimize the control and protection strategy of the above semi-physical simulation platform. The control and protection strategy includes power control, frequency control, overvoltage control, overcurrent protection and redundant system control.

[0142] Step S203: Repeat the steps. If the current performance index of the above control and protection strategy does not meet the preset protection index, repeat the above receiving step and the above verification and optimization step at least once in sequence until the performance index of the above control and protection strategy meets the preset protection index. The preset protection index includes at least one of the following: preset cut-off time and preset cut-off current.

[0143] This invention provides an electronic device including a memory and a processor. The memory stores a computer program, and the processor is configured to execute the aforementioned verification and optimization method for a flexible low-frequency power transmission system through the computer program.

[0144] Specifically, the verification and optimization methods for flexible low-frequency transmission systems include:

[0145] Step S201, receiving step, receiving target operation data from a hardware-in-the-loop simulation platform, wherein the hardware-in-the-loop simulation platform is constructed based at least on a target power grid obtained through simulation and actual power system equipment, and the target operation data is obtained by simulating the target simulation scenario through the hardware-in-the-loop simulation platform, and the target operation data includes fault recording data and power grid operation data.

[0146] Step S202, verification and optimization step, analyze the above target operating data to verify and optimize the control and protection strategy of the above semi-physical simulation platform. The control and protection strategy includes power control, frequency control, overvoltage control, overcurrent protection and redundant system control.

[0147] Step S203: Repeat the steps. If the current performance index of the above control and protection strategy does not meet the preset protection index, repeat the above receiving step and the above verification and optimization step at least once in sequence until the performance index of the above control and protection strategy meets the preset protection index. The preset protection index includes at least one of the following: preset cut-off time and preset cut-off current.

[0148] This invention provides a device including a processor, a memory, and a program stored in the memory and executable on the processor. When the processor executes the program, it performs at least the following steps:

[0149] Step S201, receiving step, receiving target operation data from a hardware-in-the-loop simulation platform, wherein the hardware-in-the-loop simulation platform is constructed based at least on a target power grid obtained through simulation and actual power system equipment, and the target operation data is obtained by simulating the target simulation scenario through the hardware-in-the-loop simulation platform, and the target operation data includes fault recording data and power grid operation data.

[0150] Step S202, verification and optimization step, analyze the above target operating data to verify and optimize the control and protection strategy of the above semi-physical simulation platform. The control and protection strategy includes power control, frequency control, overvoltage control, overcurrent protection and redundant system control.

[0151] Step S203: Repeat the steps. If the current performance index of the above control and protection strategy does not meet the preset protection index, repeat the above receiving step and the above verification and optimization step at least once in sequence until the performance index of the above control and protection strategy meets the preset protection index. The preset protection index includes at least one of the following: preset cut-off time and preset cut-off current.

[0152] The devices mentioned in this article can be servers, PCs, tablets, mobile phones, etc.

[0153] This application also provides a computer program product, which, when executed on a data processing device, is suitable for executing an initialization program having at least the following method steps:

[0154] Step S201, receiving step, receiving target operation data from a hardware-in-the-loop simulation platform, wherein the hardware-in-the-loop simulation platform is constructed based at least on a target power grid obtained through simulation and actual power system equipment, and the target operation data is obtained by simulating the target simulation scenario through the hardware-in-the-loop simulation platform, and the target operation data includes fault recording data and power grid operation data.

[0155] Step S202, verification and optimization step, analyze the above target operating data to verify and optimize the control and protection strategy of the above semi-physical simulation platform. The control and protection strategy includes power control, frequency control, overvoltage control, overcurrent protection and redundant system control.

[0156] Step S203: Repeat the steps. If the current performance index of the above control and protection strategy does not meet the preset protection index, repeat the above receiving step and the above verification and optimization step at least once in sequence until the performance index of the above control and protection strategy meets the preset protection index. The preset protection index includes at least one of the following: preset cut-off time and preset cut-off current.

[0157] It is obvious to those skilled in the art that the modules or steps of the present invention described above can be implemented using general-purpose computing devices. They can be centralized on a single computing device or distributed across a network of multiple computing devices. They can be implemented using computer-executable program code, and thus can be stored in a storage device for execution by a computing device. In some cases, the steps shown or described can be performed in a different order than those described herein, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. Thus, the present invention is not limited to any particular combination of hardware and software.

[0158] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied 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.

[0159] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations 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, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0160] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0161] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0162] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0163] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0164] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0165] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0166] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0167] 1) In the verification and optimization method for the flexible low-frequency transmission system of this application, firstly, target operating data obtained by simulating the target simulation scenario using a hardware-in-the-loop (HIL) platform is received; then, the received target operating data is analyzed to verify and optimize the control and protection strategy of the HIL platform; finally, if the current performance index of the control and protection strategy does not meet the preset protection index, the receiving step and the verification and optimization step are repeated at least once until the performance index of the corresponding control and protection strategy meets the preset protection index. This scheme uses a HIL platform to simulate different target simulation scenarios to obtain target operating data, and then comprehensively verifies and optimizes the control and protection strategy of the flexible low-frequency transmission system based on the target operating data. This solves the problem in the prior art of lacking a hardware-in-the-loop verification method for verifying and optimizing flexible low-frequency transmission technology in offshore wind power transmission scenarios. This scheme can not only effectively reduce testing costs and testing time, but also improve the safety and stability of the flexible low-frequency transmission system. Meanwhile, the hardware-in-the-loop simulation platform of this application can be applied not only to the design and testing phases of newly built flexible low-frequency transmission systems, but also to the renovation and optimization projects of existing flexible low-frequency transmission systems, and has high practical application value.

[0168] 2) In the verification and optimization device for the flexible low-frequency transmission system of this application, the receiving unit is used to receive target operating data obtained by simulating the target simulation scenario using a hardware-in-the-loop (HIL) platform; the verification and optimization unit is used to analyze the received target operating data to verify and optimize the control and protection strategy of the HIL platform; the repeating unit is used to repeat the receiving step and the verification and optimization step at least once in sequence if the current performance index of the control and protection strategy does not meet the preset protection index, until the performance index of the corresponding control and protection strategy meets the preset protection index. This solution uses a hardware-in-the-loop (HIL) platform to simulate different target simulation scenarios and obtain target operating data, thereby comprehensively verifying and optimizing the control and protection strategy of the flexible low-frequency transmission system based on the target operating data. This solves the problem in the prior art of lacking a hardware-in-the-loop verification method for verifying and optimizing flexible low-frequency transmission technology in offshore wind power transmission scenarios. This solution can not only effectively reduce testing costs and testing time, but also improve the safety and stability of the flexible low-frequency transmission system. Meanwhile, the hardware-in-the-loop simulation platform of this application can be applied not only to the design and testing phases of newly built flexible low-frequency transmission systems, but also to the renovation and optimization projects of existing flexible low-frequency transmission systems, and has high practical application value.

[0169] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A verification and optimization method for a flexible low-frequency power transmission system, characterized in that, include: The receiving step involves receiving target operating data from a hardware-in-the-loop simulation platform. The hardware-in-the-loop simulation platform is constructed based at least on a target power grid obtained through simulation and actual power system equipment. The target operating data is obtained by simulating a target simulation scenario through the hardware-in-the-loop simulation platform. The target operating data includes fault recording data and power grid operating data. The verification and optimization steps involve analyzing the target operating data to verify and optimize the control and protection strategy of the hardware-in-the-loop simulation platform. The control and protection strategy includes power control, frequency control, overvoltage control, overcurrent protection, and redundant system control. Repeat the steps. If the current performance index of the control and protection strategy does not meet the preset protection index, repeat the receiving step and the verification and optimization step at least once in sequence until the performance index of the control and protection strategy meets the preset protection index. The preset protection index includes at least one of the following: preset cut-off time and preset cut-off current. The semi-physical simulation platform includes: a data acquisition device that communicates with the simulated target power grid, wind turbine, AC / DC converter, AC filter, shunt reactor, and transformer, respectively, and is used to acquire power grid operation data of the simulated target power grid, wind turbine, AC / DC converter, AC filter, shunt reactor, and transformer; an AC-side monitoring and protection device that communicates with the data acquisition device and is used to receive the AC-side power grid operation data acquired by the data acquisition device; and a DC-side monitoring and control device that communicates with the data acquisition device and is used to receive AC fault information sent by the data acquisition device, the AC fault information being used to characterize the faults of the AC-side monitoring and protection device. Analyzing the target operating data to verify and optimize the control and protection strategy of the hardware-in-the-loop (HIL) platform includes at least one of the following: analyzing the target operating data to obtain the cut-off action time of the control and protection strategy of the HIL platform; optimizing the control and protection strategy of the HIL platform if the cut-off action time does not meet the preset cut-off action time; wherein the cut-off action time is the cut-off action time when the HIL platform malfunctions; and analyzing the target operating data to obtain the cut-off current of the control and protection strategy of the HIL platform; optimizing the control and protection strategy of the HIL platform if the cut-off current does not meet the preset cut-off current; wherein the cut-off current is the cut-off current when the HIL platform malfunctions.

2. The verification and optimization method according to claim 1, characterized in that, The AC side monitoring and protection device includes: The low-frequency AC side station control equipment communicates with the data acquisition device, and the low-frequency AC side station control equipment is used to receive the low-frequency AC side power grid operation data sent by the data acquisition device; The power frequency AC side station control equipment communicates with the data acquisition device, and the power frequency AC side station control equipment is used to receive the power grid operation data on the power frequency AC side sent by the data acquisition device; The power frequency AC protection device communicates with the power frequency AC side station control device, and the power frequency AC protection device is used to trigger protection action based on the power frequency protection signal sent by the power frequency AC side station control device; The low-frequency AC protection device communicates with the low-frequency AC side station control device, and the low-frequency AC protection device is used to trigger protection actions based on the low-frequency protection signal sent by the low-frequency AC side station control device.

3. The verification and optimization method according to claim 1, characterized in that, The DC-side monitoring and control device includes: The DRU-MMC AC converter communicates with the DC station control equipment; The M3C AC converter communicates with the DC station control equipment; The DC station control equipment communicates with the data acquisition device. The DC station control equipment is used to receive the AC fault information sent by the data acquisition device and to monitor the DRU-MMC AC converter and the M3C AC converter. The DC station control equipment is used to control the DRU-MMC AC converter based on the received AC fault information and the power grid operation data obtained by monitoring the DRU-MMC AC converter, and to control the M3C AC converter based on the received AC fault information and the power grid operation data obtained by monitoring the M3C AC converter. The fault recorder communicates with the DC station control equipment, the DRU-MMC AC converter, and the M3C AC converter, respectively. The fault recorder is used to collect fault ripple data of the DC station control equipment, the DRU-MMC AC converter, and the M3C AC converter.

4. The verification optimization method according to any one of claims 1 to 3, characterized in that, The hardware-in-the-loop simulation platform also includes: The monitoring equipment communicates with the data acquisition device, the AC side monitoring and protection device, and the DC side monitoring and control device respectively, so as to monitor the data acquisition device, the AC side monitoring and protection device, and the DC side monitoring and control device. The time synchronization device communicates with the data acquisition device, the AC side monitoring and protection device, and the DC side monitoring and control device respectively to send clock signals to the data acquisition device, the AC side monitoring and protection device, and the DC side monitoring and control device for monitoring, so as to ensure the time synchronization of the entire hardware-in-the-loop simulation platform.

5. The verification optimization method according to any one of claims 1 to 3, characterized in that, The verification optimization method further includes: If the waveform of the fault recording data of the AC side monitoring and protection device is not a sine wave, it is determined that the AC side monitoring and protection device has malfunctioned. If the waveform of the fault recording data of the DC side monitoring and control device is not a DC waveform, it is determined that the DC side monitoring and control device has malfunctioned.

6. A verification and optimization device for a flexible low-frequency power transmission system, characterized in that, include: A receiving unit is used to perform a receiving step, receiving target operating data from a hardware-in-the-loop simulation platform. The hardware-in-the-loop simulation platform is constructed based at least on a target power grid obtained through simulation and actual power system equipment. The target operating data is obtained by simulating a target simulation scenario through the hardware-in-the-loop simulation platform. The target operating data includes fault recording data and power grid operating data. The verification and optimization unit is used to perform verification and optimization steps, analyze the target operating data, and verify and optimize the control and protection strategy of the hardware-in-the-loop simulation platform. The control and protection strategy includes power control, frequency control, overvoltage control, overcurrent protection, and redundant system control. A repetition unit is used to perform repetition steps. When the current performance index of the control and protection strategy does not meet the preset protection index, the receiving step and the verification and optimization step are repeated at least once in sequence until the performance index of the control and protection strategy meets the preset protection index. The preset protection index includes at least one of the following: preset cut-off time and preset cut-off current. The semi-physical simulation platform includes: a data acquisition device that communicates with the simulated target power grid, wind turbine, AC / DC converter, AC filter, shunt reactor, and transformer, respectively, and is used to acquire power grid operation data of the simulated target power grid, wind turbine, AC / DC converter, AC filter, shunt reactor, and transformer; an AC-side monitoring and protection device that communicates with the data acquisition device and is used to receive the AC-side power grid operation data acquired by the data acquisition device; and a DC-side monitoring and control device that communicates with the data acquisition device and is used to receive AC fault information sent by the data acquisition device, the AC fault information being used to characterize the faults of the AC-side monitoring and protection device. The verification and optimization unit includes a first analysis module and a second analysis module. The first analysis module analyzes the target operating data to obtain the cut-off action time of the control and protection strategy of the hardware-in-the-loop (HIL) platform. If the cut-off action time does not meet the preset cut-off action time, the control and protection strategy of the HIL platform is optimized. The cut-off action time is the cut-off action time when the HIL platform malfunctions. The second analysis module analyzes the target operating data to obtain the cut-off current of the control and protection strategy of the HIL platform. If the cut-off current does not meet the preset cut-off current, the control and protection strategy of the HIL platform is optimized. The cut-off current is the cut-off current when the HIL platform malfunctions.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device containing the computer-readable storage medium to perform the verification and optimization method for the flexible low-frequency power transmission system according to any one of claims 1 to 5.

8. An electronic device comprising a memory and a processor, characterized in that, The memory stores a computer program, and the processor is configured to execute the verification and optimization method for the flexible low-frequency transmission system according to any one of claims 1 to 5 through the computer program.

Images