Method and system for improving frequency conversion system of sea-mounted fan

Abstract

The invention relates to the technical field of new energy power generation, in particular to a method and system for improving a frequency conversion system of a sea-mounted fan, and the method comprises the steps: analyzing the existing problems of the frequency conversion system of the sea-mounted fan; designing a frequency conversion system improvement scheme according to existing problems; the fan frequency conversion system is improved on site according to the improvement scheme; and testing the improved fan frequency conversion system. By improving the frequency conversion system of the sea-mounted fan and optimizing the structural design and the functional performance of the frequency conversion system, the failure rate of the system is remarkably reduced. Wherein the high-temperature heat dissipation problem of the frequency conversion system is thoroughly solved. The failure rate is reduced, sudden shutdown in the system operation process is reduced, the equipment availability of the wind power plant is remarkably improved, it is ensured that a unit can stably generate power within more operation time, and higher power generation benefits are brought to the wind power plant.

Description

Technical Field

[0001] The present invention relates to the technical field of renewable energy power generation, and in particular to an improved method and system for a frequency conversion system of an offshore wind turbine. Background Art

[0002] With the rapid development of the wind power industry, the reliability and efficiency requirements of the frequency conversion system are constantly increasing. However, due to the limitations of early technologies, the frequency conversion systems of some offshore wind turbines have shown obvious deficiencies under high temperature and complex grid conditions. For example, high temperature environments can easily cause overheating and damage to power modules (such as IGBTs), and the operating life of systems with insufficient heat dissipation design is significantly shortened. In addition, grid fluctuations and harmonic interference place higher demands on the stability of the frequency conversion system and grid adaptability. These problems gradually emerge during the operation of wind turbines, posing great challenges to the economy and safety of the equipment.

[0003] In order to deal with these problems, technical research in recent years has focused on improving the heat dissipation efficiency of the frequency conversion system, optimizing circuit design, and improving compatibility with the power grid. Some advanced technologies, such as high-efficiency liquid cooling, modular design, and adaptive control algorithms, have achieved remarkable results in improving the stability of the frequency conversion system. However, due to the high cost of technical transformation, some wind farms are still using old equipment, and its core technical performance cannot be compared with modern systems, which restricts the overall operating efficiency and economic benefits of wind farms.

[0004] Therefore, the improvement of wind turbine frequency conversion system is of great importance in the field of renewable energy power generation. By improving the frequency conversion system, the reliability and economy of the frequency conversion system are significantly improved, the service life of the equipment is extended, and the failure rate and operation and maintenance costs are reduced, providing strong support for the efficient operation of wind farms. Summary of the invention

[0005] In view of the above-mentioned problems, the present invention is proposed.

[0006] Therefore, the technical problem solved by the present invention is: to solve the problem of frequent failures of the frequency conversion system of the offshore wind turbine, by improving the frequency conversion system of the offshore wind turbine, the stability of the wind turbine is improved, and the failure rate of the frequency conversion system of the wind turbine group is reduced.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: analyze the existing problems of the frequency conversion system of the offshore wind turbine; design an improvement plan for the frequency conversion system based on the existing problems; improve the fan frequency conversion system on site according to the improvement plan; and test the improved fan frequency conversion system.

[0008] As a preferred solution of the method for improving the frequency conversion system of an offshore wind turbine described in the present invention, the analysis of existing problems of the frequency conversion system of the offshore wind turbine includes collecting fault information of the frequency conversion system when the wind turbine is running, and analyzing the frequency conversion system problems in a targeted manner in combination with long-term operation and maintenance records.

[0009] As a preferred solution of the method for improving the frequency conversion system of an offshore wind turbine described in the present invention, the frequency conversion system improvement solution includes replacing the ABB inverter or separating the gate drive board and the IGBT.

[0010] As a preferred solution of the method for improving the frequency conversion system of an offshore wind turbine described in the present invention, the on-site improvement of the wind turbine frequency conversion system according to the improvement solution includes replacing the frequency converter, reconfiguring the main control program, and optimizing the electrical layout in the wind turbine cabin.

[0011] As a preferred solution of the method for improving the frequency conversion system of an offshore wind turbine described in the present invention, the testing of the improved wind turbine frequency conversion system includes testing the adaptability and grid compatibility of the modified frequency conversion system under different load conditions.

[0012] As a preferred solution of the method for improving the frequency conversion system of an offshore wind turbine described in the present invention, the adaptability under different load conditions includes evaluating the response capability and stability of the frequency conversion system by simulating the operating status of the wind turbine at different wind speeds.

[0013] As a preferred solution of the method for improving the frequency conversion system of an offshore wind turbine described in the present invention, the grid compatibility includes testing the response capability of the frequency conversion system when the grid voltage increases or decreases for a short time, verifying that the frequency conversion system maintains grid-connected operation, and avoiding frequent disconnection from the grid.

[0014] Another object of the present invention is to provide an improved system for the frequency conversion system of an offshore wind turbine, which improves the stability of the wind turbine and reduces the failure rate of the frequency conversion system of the wind turbine group by improving the frequency conversion system of the offshore wind turbine.

[0015] In order to solve the above technical problems, the present invention provides the following technical solutions: a frequency conversion system improvement system for offshore wind turbines, characterized in that it comprises: a fault information analysis module, a design improvement solution module, an on-site improvement module and a performance test module;

[0016] The fault information analysis module analyzes existing problems of the frequency conversion system of the Haizhuang wind turbine;

[0017] The design improvement solution module designs a frequency conversion system improvement solution based on existing problems;

[0018] The on-site improvement module improves the fan frequency conversion system on-site according to the improvement plan;

[0019] The performance test module is used to test the improved fan frequency conversion system.

[0020] A computer device includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the above-mentioned method for improving a frequency conversion system of an offshore wind turbine are implemented.

[0021] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the steps of the above-mentioned method for improving the frequency conversion system of an offshore wind turbine.

[0022] Beneficial effects of the present invention: The improved localization upgrade of the core components of the system makes the supply of spare parts more stable and sufficient. This not only effectively solves the problem of long procurement cycle and high price of spare parts in the original system, but also avoids the risk of long-term downtime caused by the break of spare parts supply chain. In particular, the application of localized components significantly reduces the cost of maintenance and replacement, greatly improves the maintenance efficiency of equipment, and provides reliable logistical support for the long-term operation of wind farms.

[0023] By optimizing the structural design and functional performance of the frequency conversion system, the system failure rate has been significantly reduced. The high temperature heat dissipation problem of the frequency conversion system has been completely solved. This reduction in failure rate not only reduces sudden shutdowns during system operation, but also significantly improves the equipment availability of the wind farm, ensuring that the unit can generate stable power for more operating time, bringing higher power generation benefits to the wind farm.

[0024] The improved inverter has significantly improved safety and reliability. By optimizing the circuit layout and improving the control logic, the inverter's adaptability to high temperature, overload and grid fluctuations has been significantly enhanced. The newly added high and low voltage ride-through function enables the system to remain connected to the grid when the grid voltage fluctuates greatly, thus avoiding frequent disconnection from the grid. This not only improves the safety of wind turbines, but also reduces the impact on the grid, providing a guarantee for the stable operation of the grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0026] Figure 1 A flow chart of a method for improving a frequency conversion system of an offshore wind turbine provided in accordance with an embodiment of the present invention.

[0027] Figure 2A schematic diagram of a method for improving a frequency conversion system of an offshore wind turbine after disassembly of a control panel is provided in accordance with an embodiment of the present invention.

[0028] Figure 3 A schematic diagram of an improved power module of an improved method for an offshore wind turbine frequency conversion system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Example 1

[0032] Reference Figure 1 , which is an embodiment of the present invention, a method for improving a frequency conversion system of a sea-mounted wind turbine, comprising:

[0033] S1: Analyze the existing problems of Haizhuang wind turbine frequency conversion system.

[0034] It should be noted that the analysis of existing problems of the frequency conversion system of Haizhuang wind turbines includes collecting fault information of the frequency conversion system when the wind turbine is running, and conducting targeted analysis of the frequency conversion system problems in combination with long-term operation and maintenance records.

[0035] In the embodiment of the present application, the Haizhuang H93-2.0MW wind turbine is equipped with an ABB air-cooled inverter. The working position of the equipment is arranged in the cabin, and its structure is compact and closed. Due to the particularity of the wind turbine operating environment and structural design, the working conditions are limited. Poor heat dissipation causes the operating temperature of the inverter to remain high, and the service life of IGBT and capacitors is shortened in high temperature environments. The electronic components used in a large number of inverters, especially capacitors, generally require an ambient temperature of about 40 degrees. Their theoretical design life can reach more than 20 years, but the life of electrolytic capacitors depends on their internal temperature. Under long-term high temperature conditions, the life of electrolytic capacitors drops sharply and may even fail. It is generally said that for every 10-degree increase in temperature, the service life drops by about half.

[0036] Since the inverter runs at high temperature for a long time, the gate driver board AGDR will age, and eventually the gate driver board AGDR will fail to control the IGBT, and the SC short circuit fault or IGBT explosion will be frequently reported. The explosion of IGBT is extremely destructive, and the explosion arc will cause many surrounding boards to be damaged. The ABB inverter used in Haizhuang wind turbines is an early product. With the upgrading of equipment, the output of spare parts has decreased year by year, and there are fewer spare parts in the market. The spare parts are stocked and delivered from suppliers for more than 3 months, which often results in forced shutdowns due to on-site defect treatment without spare parts replacement, affecting the unit's availability and power generation.

[0037] The original IGBT module design of ABB inverter integrates the driver board and IGBT together. When the IGBT module is working, it will generate heat and cause the temperature to rise, so that the driver board will work in a high temperature environment for a long time. Since the driver board is mainly composed of electronic components, and the performance and life of electronic components are greatly affected by temperature, the driver board will work in a high temperature environment for a long time, causing the driver board to burn, age and short-circuit, and eventually cause the drive to fail and the IGBT module to explode. IGBT explosion is extremely destructive, and the explosion arc will cause many surrounding boards to be damaged, resulting in excessive consumption of spare parts and increased equipment maintenance costs.

[0038] S2: Design improvement plans for the frequency conversion system based on existing problems.

[0039] It should be noted that the improvement scheme for designing the frequency conversion system includes replacing the ABB frequency converter or separating the gate driver board and the IGBT.

[0040] In the embodiment of the present application, the improvement plan is to replace the ABB frequency converter. Specifically, as an early wind turbine unit put into production, the Haizhuang wind turbine adopts a centralized layout of the grid cabinet, control cabinet and frequency converter cabinet in the cabin. However, this design has frequent failures in long-term operation, especially in the frequency converter power module. Due to the compact structural design of the ABB frequency converter and insufficient heat dissipation performance, the power module is easily damaged in a high temperature environment. At the same time, its circuit layout is complex, maintenance is difficult, and the spare parts supply cycle is long and costly. These problems directly lead to a high failure rate of the frequency converter, increased operation and maintenance costs, and reduced power generation efficiency.

[0041] This embodiment proposes to use domestic inverters to replace ABB inverters to fundamentally optimize system performance. Domestic inverters are optimized for high temperature, complex working conditions and long-term operation requirements in design, have efficient heat dissipation performance and modular design, and have sufficient spare parts supply and lower cost. By replacing domestic inverters, not only can the frequent failures caused by design problems be completely solved, but also maintenance time can be shortened, manpower input and spare parts procurement costs can be reduced, and the operating efficiency and economy of the fan can be further improved.

[0042] In the embodiment of the present application, the improvement scheme is to separate the gate driver board and the IGBT. Specifically, the improvement of the fan frequency conversion system can also be achieved in other ways, such as separating the gate driver board and the IGBT, so that the gate driver board is away from the heat source IGBT, and at the same time, the gate driver board is close to the air outlet of the cooling fan. Since the gate driver board is repositioned near the air outlet of the cooling fan, it can directly benefit from the cooling airflow and maximize the heat dissipation efficiency. The optimized layout design of the cooling fan makes the temperature distribution of the entire module more uniform, avoids local overheating problems, and prolongs the service life. This can effectively solve the "three highs" problem of the ACS800 inverter, reduce the failure rate of the inverter, reduce the consumption of spare parts, effectively reduce production costs, and improve the availability of the fan.

[0043] The modular design is adopted to connect the separated gate driver board to the IGBT module through a flexible connection, and the circuit routing is rearranged to ensure the stability of signal transmission. This design not only improves the heat dissipation efficiency, but also enhances the maintainability and scalability of the system.

[0044] S3: Improve the fan frequency conversion system on site according to the improvement plan.

[0045] It should be noted that the on-site improvement of the fan frequency conversion system according to the improvement plan includes replacing the frequency converter, reconfiguring the main control program, and optimizing the electrical layout in the fan cabin.

[0046] Furthermore, the specific implementation plan for replacing the ABB inverter with a domestic inverter is as follows: first, completely power off the fan inverter system, check the electrical connection status in the cabin, ensure electrical safety during the construction process, and start disassembly after confirming that there is no risk of live electricity. Remove the internal power grid cable, stator cable, rotor cable, communication cable and encoder cable of the inverter, remove the 400V power supply cable from the main control to the ABB inverter, remove the ABB inverter fixing screws and the cabin top cover, completely dismantle the old equipment to make room for the installation of the new equipment, and ensure that the electrical interface and mechanical structure are not damaged during the disassembly process. Use a crane to lift the ABB inverter from the cabin to the tower base, and ensure that the mechanical interface is firm and meets the installation standards of the original equipment. Then, use a crane to lift the domestic inverter from the tower base to the cabin for fixing and installation. Finally, connect the inverter grid cable, rotor cable, stator cable, communication line, signal line, and encoder line and reconfigure the main control program, and remove unnecessary lines to optimize the electrical layout in the fan cabin.

[0047] It should be noted that the specific implementation plan for separating the gate driver board and the IGBT is to ensure that the inverter is completely powered off, discharge before disassembly, check the residual charge in the capacitor module to avoid the risk of electric shock, use a T20 six-flower wrench to loosen the 8 screws that fix the front cover, remove the front cover, and place it in a safe area to avoid damage. Disconnect the cables connected to the control panel and disassemble the control panel, ensuring that the cable labels are clear for subsequent reconnection, and disconnect the cable connection between the control panel and the main circuit, such as Figure 2 As shown. Remove the fan power control board, AGDR-71C door machine drive board and IGBT module. After removing the internal panels, use a compressed air can to remove dust from the power module and surrounding areas, and use a soft brush to clean the dust on the heat sink to ensure the heat dissipation effect of the module. Place the new IGBT module in the designated position, ensure good contact when fixing the screws, install the clamping capacitor, and check that the connection is firm to avoid looseness.

[0048] Reinstall the driver board to a new location according to the design plan, making sure it is away from the IGBT heat source, install the driver board base to improve the fixing strength and avoid loosening caused by vibration, modify the fan power supply line, change the power supply point to a new location, ensure that the fan can provide continuous and effective cooling airflow for the driver board, use a multimeter to detect the power supply voltage to ensure that the circuit is normal, remove the old filter and install a new filter to ensure smooth air circulation in the cooling system and improve the overall heat dissipation efficiency. Figure 3 shown.

[0049] After installation, check all connection cables, including the control panel, fan power control board, driver board and IGBT module, to ensure that the wiring is firm and correct, and that there are no exposed parts in the circuit and connection points to avoid short circuit risks. Power on the fan power supply circuit and driver board and check their operating status to ensure good cooling effect, and test the conduction performance of the IGBT module to ensure its normal operation.

[0050] S4: Test the improved fan frequency conversion system.

[0051] It should be noted that the testing of the improved wind turbine frequency conversion system includes testing the adaptability and grid compatibility of the modified frequency conversion system under different load conditions.

[0052] Furthermore, during the frequency conversion system testing phase, the response capability and stability of the frequency conversion system are evaluated by simulating the operation status of the fan under different load conditions. The adaptability test under different load conditions includes the following items:

[0053] Low load condition: that is, the fan is in a no-load or light-load state. Test whether the inverter can stably provide the required power when the fan is running at low wind speed or no-load to avoid frequency drift and low-frequency oscillation.

[0054] Medium load condition: that is, the wind turbine is in the normal operating range. The test is to test the real-time adjustment capability of the frequency conversion system to the wind turbine output power under typical wind speed conditions to ensure efficient energy conversion and grid compatibility.

[0055] High load condition: that is, the fan is close to the maximum design power, simulating strong wind or gust conditions, testing the response speed of the frequency conversion system to high power demand, as well as the heat dissipation efficiency and protection mechanism under high load conditions.

[0056] Furthermore, the grid compatibility of the frequency conversion system is tested, and a dedicated grid simulation device is used to generate controllable voltage fluctuations, simulate high-voltage and low-voltage grid scenarios, ensure that the wind turbine frequency conversion system is connected to the test equipment normally, and set basic test parameters, such as the grid rated voltage (for example, 400V) and its fluctuation range.

[0057] In the simulated low voltage ride-through test, a grid simulation device is used to gradually reduce the voltage from the rated value to 20%, and this state is simulated for about 150 milliseconds to 1 second (according to national grid standards, such as GB / T19963). The test is to see whether the wind turbine frequency conversion system can maintain grid-connected operation, whether the low voltage compensation mechanism is triggered, whether the output current and voltage waveforms of the inverter remain stable, whether the system triggers protection mechanisms (such as current limiting or power limiting), and whether abnormal signals or fault alarms are generated.

[0058] In the simulated high voltage ride-through test, the simulated grid voltage is gradually increased from the rated value to 130%, and maintained in this state for about 150 milliseconds to 1 second to test the operating state of the frequency conversion system and the stability of the fan frequency conversion system under high voltage conditions. In other words, it tests whether the system is continuously connected to the grid and whether there is overvoltage protection action.

[0059] After completing the voltage fluctuation simulation, restore the grid voltage to the rated value, check whether the system can quickly resume normal operation after restoration, and output stable voltage and frequency, and record the dynamic response time and abnormal behavior during the recovery process.

[0060] Example 2

[0061] As an embodiment of the present invention, the present invention provides the following technical solutions: a frequency conversion system improvement system for offshore wind turbines, comprising: a fault information analysis module, a design improvement solution module, a field improvement module and a performance test module;

[0062] The fault information analysis module analyzes existing problems of the frequency conversion system of the Haizhuang wind turbine;

[0063] The design improvement solution module designs a frequency conversion system improvement solution based on existing problems;

[0064] The on-site improvement module improves the fan frequency conversion system on-site according to the improvement plan;

[0065] The performance test module is used to test the improved fan frequency conversion system.

[0066] This embodiment also provides a computing device, which is applicable to a method for improving a frequency conversion system of a wind turbine installed in an offshore wind farm, and includes:

[0067] Memory and processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement a method for improving the frequency conversion system of an offshore wind turbine as proposed in the above embodiment.

[0068] The storage medium proposed in this embodiment and the improved method for the frequency conversion system of a sea-mounted wind turbine proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0069] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0070] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0071] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0072] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for improving the frequency conversion system of a sea-mounted wind turbine, characterized in that: include: Analyze the existing problems of the frequency conversion system of Haizhuang wind turbines; Design frequency conversion system improvement solutions based on existing problems; Improve the fan frequency conversion system on site according to the improvement plan; Test the improved fan frequency conversion system.

2. A method for improving a frequency conversion system of a sea-mounted wind turbine as claimed in claim 1, characterized in that: The analysis of existing problems of the frequency conversion system of the Haizhuang wind turbine includes collecting fault information of the frequency conversion system when the wind turbine is running, and analyzing the frequency conversion system problems in a targeted manner in combination with long-term operation and maintenance records.

3. A method for improving a frequency conversion system of a sea-mounted wind turbine as claimed in claim 2, characterized in that: The improvement plan for designing the frequency conversion system includes replacing the ABB frequency converter or separating the gate driver board and the IGBT.

4. A method for improving a frequency conversion system of a sea-mounted wind turbine as claimed in claim 3, characterized in that: The on-site improvement of the fan frequency conversion system according to the improvement plan includes replacing the frequency converter, reconfiguring the main control program, and optimizing the electrical layout in the fan cabin.

5. A method for improving a frequency conversion system of a sea-mounted wind turbine as claimed in claim 4, characterized in that: The testing of the improved fan frequency conversion system includes testing the adaptability and grid compatibility of the modified frequency conversion system under different load conditions.

6. A method for improving a frequency conversion system of a sea-mounted wind turbine as claimed in claim 5, characterized in that: The adaptability under different load conditions includes evaluating the response capability and stability of the frequency conversion system by simulating the operating state of the fan under different wind speeds.

7. A method for improving a frequency conversion system of a sea-mounted wind turbine as claimed in claim 6, characterized in that: The grid compatibility includes testing the response capability of the frequency conversion system when the grid voltage increases or decreases for a short period of time, and verifying that the frequency conversion system can maintain grid-connected operation and avoid frequent disconnection from the grid.

8. A system using an improved frequency conversion system of a sea mounted wind turbine as claimed in any one of claims 1 to 7, characterized in that: include: Analyze fault information module, design improvement plan module, field improvement module and performance test module; The fault information analysis module analyzes existing problems of the frequency conversion system of the Haizhuang wind turbine; The design improvement solution module designs a frequency conversion system improvement solution based on existing problems; The on-site improvement module improves the fan frequency conversion system on-site according to the improvement plan; The performance test module is used to test the improved fan frequency conversion system.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of a method for improving an offshore wind turbine frequency conversion system as described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of a method for improving a frequency conversion system of an offshore wind turbine according to any one of claims 1 to 7 are implemented.

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