An optimization method for a column of a floating wind platform

Abstract

This invention discloses an optimization method for the columns of a floating wind turbine platform, applied to a three-column floating wind turbine platform, belonging to the field of floating foundation design. The method first determines the reference diameter and uniform height of the bow column based on the maximum operating conditions of the wind turbine. Then, the two stern columns are set to have the same diameter but smaller than the bow column, with a diameter ratio of 1 to 1.3. Subsequently, a three-dimensional model of the platform is built and adapted to the design heave plate parameters. Hydrostatic and initial stability calculations are then performed sequentially, combined with hydrodynamic, wind, wave, and current coupling analysis of the target sea area, to verify the platform's static and dynamic stability. If the requirements are not met, the stern column diameter is adjusted and the verification is repeated until the indicators meet the requirements. This invention breaks with the traditional equal-diameter design, reducing the amount of steel used in the stern columns while ensuring platform stability, thus lowering manufacturing costs. It also simplifies the platform's fabrication, transportation, and installation processes, adapting to wind turbines of different power and marine environments, and has strong practicality and scalability.

Description

Technical Field

[0001] This invention relates to the field of marine engineering floating foundation design technology, specifically to an optimization method for the support column of a floating wind power platform. Background Technology

[0002] Floating platforms are core structures in marine engineering and offshore wind power. Their design must simultaneously consider structural strength, stability, economy, and adaptability to the marine environment, making them a crucial aspect of offshore wind power equipment development. Among them, the three-post floating platform has become the mainstream application form in the offshore wind power field due to its excellent stability and applicability to various scenarios.

[0003] Existing three-column floating platforms generally employ a symmetrical, equal-diameter column structure design. All columns are uniformly designed according to maximum operating conditions. While this meets the platform's basic stability requirements, it presents significant design redundancy. This design approach results in an overall large column diameter, directly leading to excessive steel consumption and a substantial increase in the platform's material and manufacturing costs. Furthermore, the large-diameter, uniformly sized columns also increase the platform's overall volume and weight, causing numerous inconveniences for subsequent transportation and offshore installation.

[0004] As the offshore wind power industry rapidly expands into deep-sea areas, the industry's requirements for the economy, environmental protection, and ease of construction of floating platforms are increasing. How to reduce steel consumption and lower overall costs while strictly ensuring the platform's stability, structural strength, and other core performance characteristics has become a pressing technical challenge in the design of floating wind power platforms. Summary of the Invention

[0005] The purpose of this invention is to provide an optimization method for the columns of a floating wind power platform, which aims to solve the problems of large steel consumption, high overall cost, and inconvenient transportation and installation caused by the use of equal-diameter columns in existing three-column floating wind power platforms. On the basis of ensuring that the static and dynamic stability of the platform meets the specifications, the invention achieves differentiated optimization design of the column structure.

[0006] To achieve the above objectives, this invention proposes an optimization method for the support column of a floating wind power platform, which is implemented using the following technical solution:

[0007] An optimization method for the masts of a floating wind turbine platform is applied to a three-mast floating wind turbine platform. The three-mast floating wind turbine platform includes a bow mast for connecting the wind turbine, two symmetrically arranged stern masts, a cross brace connecting the bow and stern masts, and a sway plate located below the bow and stern masts. The optimization method includes the following steps:

[0008] S1. Determine the basic design parameters of the floating wind power platform, and determine the reference diameter and uniform height of the bow column based on the maximum working condition requirements. The bow column is the main load-bearing column that supports the wind turbine.

[0009] S2. Design the stern pillars with different diameters, design the two stern pillars with equal diameters, and make the design diameter of the stern pillars smaller than the reference diameter of the bow pillars, so that the diameter ratio of the bow pillars to the stern pillars is in the range of 1 to 1.3 times.

[0010] S3. Based on the column size parameters in steps S1 and S2, build a three-dimensional solid model of the floating wind power platform, and at the same time determine the matching design parameters of the heave plate so that the horizontal distance from the bow column and stern column to the edge of the heave plate is consistent, and the arc structure of the heave plate is adapted to the horizontal distance from the column to the edge.

[0011] S4. Perform hydrostatic and initial stability calculations and analyses on the completed three-dimensional solid model of the floating wind power platform, obtain hydrostatic characteristic parameters such as the platform's displacement, center of gravity position, center of buoyancy position, initial metacenter height GM value, and recovery stiffness, and verify whether the platform's static stability meets the specifications.

[0012] S5. Perform hydrodynamic analysis on the platform model that meets the static stability requirements, establish the platform's mooring system, and combine the marine environmental parameters of the target application sea area to conduct time-domain and frequency-domain wind-wave-current coupled load analysis to verify whether the platform's dynamic stability meets the design requirements.

[0013] S6. If the static and dynamic stability of the platform model meet the requirements, then the column size parameter is determined as the final column design parameter of the floating wind power platform; if any stability index does not meet the requirements, return to step S2, adjust the design diameter of the stern column, and repeat steps S3 to S6 until all stability indexes meet the design requirements.

[0014] As a further improvement to the technical solution of the present invention, in step S1, the design value of the uniform height of the bow column and the stern column is 29m, and the design value of the reference diameter of the bow column is 15.8m.

[0015] As a further improvement to the technical solution of the present invention, in step S2, the design diameter of the stern column is 13m. At this time, the diameter ratio of the bow column to the stern column is 1.215 times, which is within the design range of 1 to 1.3 times.

[0016] As a further improvement to the technical solution of the present invention, in step S3, the horizontal distance from the bow column to the edge of the heave plate is 3.5m, and the diameter of the heave plate segment corresponding to the matching bow column is 11.4m; the horizontal distance from the stern column to the edge of the heave plate is 3.5m, and the diameter of the heave plate segment corresponding to the matching stern column is 10m.

[0017] As a further improvement to the technical solution of the present invention, in step S3, the centers of the three columns are distributed in an equilateral triangle, the distance between the centers of each column is equal, and each column is rigidly connected by a horizontal brace to form an integral column support structure.

[0018] As a further improvement to the technical solution of the present invention, in step S4, the verification standard for the hydrostatic and initial stability calculation and analysis is: the initial metacenter height GM value of the platform under operating conditions is greater than the lower limit of the GM value specified in the design specification of marine engineering floating platforms, and the recovery stiffness of the platform does not decrease, thus ensuring the static recovery capability of the platform.

[0019] As a further improvement to the technical solution of the present invention, in step S5, the hydrodynamic analysis is completed using AQWA hydrodynamic analysis software. The three-dimensional solid model of the platform is imported into the AQWA hydrodynamic analysis software and meshed. At the same time, basic parameters such as water depth, overall center of gravity coordinates, and moment of inertia of the target application sea area are set.

[0020] As a further improvement to the technical solution of the present invention, in step S5, the marine environmental parameters of the target application sea area include wave frequency interval, wave direction, wind speed, and ocean current speed. The wind-wave-current coupled load analysis needs to cover the entire wind-wave-current injection angle range of 0° to 180° to verify whether the wind tilt angle of the platform meets the dynamic stability specification requirements under different angles of attack.

[0021] As a further improvement to the technical solution of the present invention, in step S5, the establishment of the mooring system needs to match the column layout and weight distribution of the platform to ensure the uniformity of the force on the mooring system, and the design parameters of the mooring system should be compatible with the marine environmental parameters of the hydrodynamic analysis.

[0022] As a further improvement to the technical solution of the present invention, in step S6, if the stability index does not meet the requirements, the adjustment range of the stern column design diameter is 0.2~0.5m / time, and the diameter ratio of the bow column to the stern column after adjustment is still maintained in the range of 1~1.3 times.

[0023] The beneficial effects of this invention are:

[0024] The optimization method for the floating wind turbine platform columns of this invention involves designing differentiated diameters for the bow and stern columns of a three-column floating wind turbine platform. The two stern columns are designed with equal diameters, maintaining a diameter ratio of 1 to 1.3 times that of the bow column. This is combined with the adaptive design of the heave plate, calculations and verification of hydrodynamics and initial stability, and hydrodynamic-wind-wave-current coupling analysis of the target sea area environment. Furthermore, iterative parameter adjustments ensure that both static and dynamic stability of the platform meet regulatory requirements. This method not only overcomes the design redundancy problem of traditional equal-diameter columns but also significantly reduces the steel used in the stern columns. The method directly reduces the platform's material and manufacturing costs while ensuring that the platform's core support and stability performance are not affected. Furthermore, the optimized column size reduces the overall volume and weight of the platform, simplifying the manufacturing, transportation, and offshore installation processes. At the same time, the method is standardized, highly operable, and adaptable to the design of three-column floating wind power platforms with different power wind turbines and different marine environments. It provides a practical and feasible technical solution for the lightweight, economical, and environmentally adaptable design of floating wind power platforms, and has good application and promotion value in the fields of offshore wind power and marine engineering. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a 3D model of the optimized 18MW floating wind power platform of the present invention;

[0027] Figure 2 This is a top view of the optimized floating wind power platform of the present invention;

[0028] Figure 3 A top view of a traditional equal-diameter column-mounted floating wind power platform;

[0029] Figure 4 This is a front view of the floating wind power platform of the present invention;

[0030] Figure 5 This is a side view of the floating wind power platform of the present invention;

[0031] Figure 6 This is a schematic diagram of the mooring system structure of the floating wind power platform of the present invention;

[0032] Figure 7 This is a schematic diagram of the angle of attack distribution of wind and wave inrush loads on the floating wind power platform of the present invention;

[0033] Figure 8This is a schematic diagram of the static calculation of the floating body in this invention.

[0034] The meanings of the labels in the attached diagram are as follows:

[0035] 1-Bow column, 2-Stern column, 3-Horizontal brace, 4-Hanging plate. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or a structurally integral connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0040] The present invention will be further described in detail below with reference to the accompanying drawings.

[0041] Reference Figure 1 and Figure 2This invention provides an optimization method for the columns of a floating wind turbine platform, applied to a three-column floating wind turbine platform. The three-column floating wind turbine platform includes a bow column 1 for connecting the wind turbine, two symmetrically arranged stern columns 2, a cross brace 3 connecting the bow column 1 and the stern columns 2, and a sway plate 4 disposed below the bow column 1 and the stern columns 2. The optimization method includes the following steps:

[0042] S1. Determine the basic design parameters of the floating wind power platform, and determine the reference diameter and uniform height of the bow column 1 based on the maximum working condition requirements. The bow column 1 is the main load-bearing column that carries the wind turbine.

[0043] S2. The diameter of the stern pillar 2 is differentiated. The two stern pillars 2 are designed with equal diameters, and the design diameter of the stern pillar 2 is smaller than the reference diameter of the bow pillar 1, so that the diameter ratio of the bow pillar 1 to the stern pillar 2 is in the range of 1 to 1.3.

[0044] S3. Based on the column size parameters in steps S1 and S2, build a three-dimensional solid model of the floating wind power platform, and at the same time determine the matching design parameters of the heave plate 4 so that the horizontal distance from the bow column 1 and the stern column 2 to the edge of the heave plate 4 is consistent, and the arc structure of the heave plate 4 is adapted to the horizontal distance from the column to the edge.

[0045] S4. Perform hydrostatic and initial stability calculations and analyses on the completed three-dimensional solid model of the floating wind power platform, obtain hydrostatic characteristic parameters such as the platform's displacement, center of gravity position, center of buoyancy position, initial metacenter height GM value, and recovery stiffness, and verify whether the platform's static stability meets the specifications.

[0046] S5. Perform hydrodynamic analysis on the platform model that meets the static stability requirements, establish the platform's mooring system, and combine the marine environmental parameters of the target application sea area to conduct time-domain and frequency-domain wind-wave-current coupled load analysis to verify whether the platform's dynamic stability meets the design requirements.

[0047] S6. If the static and dynamic stability of the platform model meet the requirements, then the column size parameter is determined as the final column design parameter of the floating wind power platform; if any stability index does not meet the requirements, return to step S2, adjust the design diameter of the stern column 2, and repeat steps S3 to S6 until all stability indexes meet the design requirements.

[0048] Based on the actual stress conditions of a three-column floating wind turbine platform, this invention addresses the structural characteristics of the bow column 1 (carrying the wind turbine) as the main load-bearing structure and the two stern columns 2 as bearing relatively less stress. The core idea is a differentiated design of the column diameters. First, the reference diameter and height of the bow column 1 are determined based on the maximum operating requirements of the wind turbine. Then, the stern columns 2 are reasonably reduced in diameter while ensuring that both stern columns 2 have the same diameter, resulting in a diameter ratio between the bow and stern columns 2 that is between 1 and 1.3. Simultaneously, the heave plate 4 is designed to be compatible with the column dimensions, ensuring uniform stress distribution in the connection structure between the columns and the heave plate 4. Subsequently, the static stability of the platform is verified through hydrostatic and initial stability calculations. The dynamic stability of the platform is verified through time-domain and frequency-domain wind-wave-current coupled hydrodynamic analysis combined with marine environmental parameters of the target application area. Finally, through iterative parameter adjustments, both the optimized column design and the platform stability requirements are met, eliminating the design redundancy problem of traditional equal-diameter columns from a design perspective.

[0049] This invention breaks away from the traditional design pattern of equal diameter for three-column floating wind turbine platforms. It employs differentiated optimization design based on the actual stress conditions of the columns, significantly reducing the steel usage of the stern column 2 while ensuring that both static and dynamic stability meet marine engineering design specifications. This directly lowers the platform's material and manufacturing costs. The optimized column dimensions, combined with a suitably designed heave plate 4, ensure uniform stress distribution across the platform, while reducing its overall volume and weight, simplifying the manufacturing, transportation, and offshore installation processes. The entire optimization method is standardized, highly operable, and adaptable to the design of three-column floating wind turbine platforms with different power turbines and marine environments. It provides a universal technical solution for the lightweight and economical design of floating wind turbine platforms, and has broad application and promotion value in the fields of offshore wind power and marine engineering.

[0050] In some embodiments, in step S1, the design value of the uniform height of the bow column 1 and the stern column 2 is 29m, and the design value of the reference diameter of the bow column 1 is 15.8m.

[0051] It should be noted that, based on the actual working conditions and stress requirements of the 18MW wind turbine, the reference diameter of the bow column 1 and the uniform height of the matching column were determined to meet the maximum load requirements of the wind turbine. The reference diameter of the bow column 1 was set to 15.8m and the uniform height of the column was set to 29m. This provides reasonable and accurate reference parameters for the subsequent differentiated diameter reduction design of the stern column 2, ensuring that the structural strength of the main load-bearing bow column 1 and the overall support height of the platform meet the usage requirements of the 18MW offshore wind power.

[0052] This invention provides precise and suitable basic dimensional parameters for the optimized design of the columns of an 18MW floating wind power platform, ensuring that the dimensions of the bow column 1 can fully meet the stress requirements under the maximum operating conditions of the 18MW wind turbine, and guaranteeing the strength and stability of the platform's core support structure. The uniform column height ensures the overall structural coordination of the platform, laying a reasonable foundation for the subsequent diameter reduction design of the stern column 2, avoiding optimization design failures caused by unreasonable baseline parameters. At the same time, the suitable basic parameters also make the platform's modeling and analysis work more targeted.

[0053] In some embodiments, in step S2, the design diameter of the stern column 2 is 13m. At this time, the diameter ratio of the bow column 1 to the stern column 2 is 1.215 times, which is within the design range of 1 to 1.3 times.

[0054] It should be noted that, based on the reference diameter of the bow column 1 (15.8m), the design diameter of the two stern columns 2 was determined to be 13m, so that the diameter ratio of the bow and stern columns reached 1.215 times. This ratio is within the reasonable design range of 1 to 1.3 times. This not only achieves the effective reduction of the diameter of the stern column 2 to reduce the amount of steel used, but also ensures the support balance and overall stability of the platform, and avoids the platform from becoming unbalanced and the stability index from being reduced due to excessive reduction of the diameter of the stern column 2.

[0055] This invention achieves precise diameter reduction of the stern column 2 within a reasonable diameter ratio range. Compared with the traditional equal diameter design, it significantly reduces the amount of steel used in the two stern columns 2, thereby significantly reducing the material and manufacturing costs of the platform. The diameter ratio of 1.215 takes into account the platform's support balance and overall stability, avoiding the problem of decreased platform stability caused by diameter reduction. At the same time, the equal diameter stern column 2 design ensures the uniformity of force distribution at the tail of the platform, simplifies the processing and manufacturing process of the stern column 2, and reduces the difficulty of production and processing.

[0056] In some embodiments, in step S3, the horizontal distance from the bow column 1 to the edge of the heave plate 4 is 3.5m, and the diameter of the heave plate 4 segment corresponding to the matching bow column 1 is 11.4m; the horizontal distance from the stern column 2 to the edge of the heave plate 4 is 3.5m, and the diameter of the heave plate 4 segment corresponding to the matching stern column 2 is 10m.

[0057] It should be noted that the horizontal distance from the bow column 1 and stern column 2 to the edge of the heave plate 4 is kept consistent and set at 3.5m. At the same time, based on the diameter of the main column, the diameter of the section of heave plate 4 corresponding to bow column 1 is designed to be 11.4m and the diameter of the section of heave plate 4 corresponding to stern column 2 is designed to be 10m. This ensures that the structural dimensions of the heave plate 4 are compatible with the height of the columns, ensuring that the connection between the bottom column and the heave plate 4 of the platform is evenly stressed, avoiding structural stress concentration caused by excessive local stress, giving full play to the auxiliary role of the heave plate 4 in the stability of the platform, and improving the overall structural stability of the platform.

[0058] This invention ensures uniform stress distribution at the connection between the column and the sway plate 4, avoiding localized stress concentration caused by dimensional mismatch, and improving the structural strength and overall stability of the platform bottom. The uniform horizontal distance from the column to the edge of the sway plate 4 makes the stress distribution on the sway plate 4 more uniform, fully leveraging the stabilizing auxiliary role of the sway plate 4 and further ensuring the stability performance of the platform. The adapted diameter design of the sway plate 4 connection section makes the connection between the column and the sway plate 4 fit more closely, simplifying the processing and installation of the connection part and reducing construction difficulty.

[0059] In some embodiments, in step S3, the centers of the three columns are distributed in an equilateral triangle, the distance between the centers of each column is equal, and each column is rigidly connected by a cross brace 3 to form an integral column support structure.

[0060] It should be noted that the centers of the bow column 1 and the two stern columns 2 are arranged in an equilateral triangle layout, so that the center distance between each column is equal. Then, the three columns are rigidly connected by the cross brace 3 to form an integral column support structure. This allows the wind, wave and current loads on the platform to be evenly distributed to the three columns, avoiding excessive stress on local columns and improving the overall structural stability and load resistance of the platform.

[0061] The equilateral triangular column layout, combined with the rigid connection of the cross brace 3, ensures that the platform's stress is evenly distributed to each column, effectively preventing localized column stress overload and improving the overall structural stability and resistance to wind, waves, and current loads. The equidistant column center design and integrated support structure make the platform's center of gravity distribution more reasonable, further guaranteeing the platform's stability. The rigid connection of the cross brace 3 simplifies the connection structure between columns, improves the overall integrity of the platform structure, and also reduces the difficulty of platform processing and installation.

[0062] In some embodiments, in step S4, the verification criteria for the hydrostatic and initial stability calculation analysis are: the initial metacenter height GM value of the platform under operating conditions is greater than the lower limit of the GM value specified in the design code of marine engineering floating platforms, and the recovery stiffness of the platform does not decrease, ensuring the static recovery capability of the platform.

[0063] It should be noted that the platform's displacement, center of gravity position, center of buoyancy position, initial metacentric height (GM) value, and recovery stiffness are obtained through floating body static calculations. The verification standard is that the platform's initial metacentric height (GM) value under operating conditions is greater than the lower limit specified in the marine engineering floating platform design code, and the recovery stiffness does not decrease. This is used to determine whether the platform's static stability meets the design requirements and to ensure the platform's static recovery capability from a static perspective.

[0064] This invention, through precise calculation of hydrostatic characteristic parameters and clear verification standards, can effectively determine whether the static stability of the platform meets the specifications. It proves from a design principle perspective that the differentiated design of column diameters will not impair the platform's static recovery capability. Using the lower limit of the GM value specified in the standard as the criterion, the verification of static stability is made more scientific and authoritative, ensuring that the static stability of the optimized platform meets industry design standards. The detection of recovery stiffness can further ensure that the platform has good reset capability after being subjected to external forces, avoiding the risk of static overturning.

[0065] In some embodiments, in step S5, the hydrodynamic analysis is performed using AQWA hydrodynamic analysis software. The three-dimensional solid model of the platform is imported into the AQWA hydrodynamic analysis software and meshed. At the same time, basic parameters such as the water depth of the target application sea area, the overall center of gravity coordinates, and the moment of inertia are set.

[0066] It should be noted that AQWA hydrodynamic analysis software was used to conduct hydrodynamic analysis of the platform. The completed 3D solid model of the platform was imported into the software and meshed. At the same time, basic parameters such as water depth, overall center of gravity coordinates of the platform, and moment of inertia were set according to the actual marine environment of the target application area. This provides an accurate model basis and environmental parameters for subsequent wind, wave and current coupled load analysis, ensuring the authenticity and accuracy of the hydrodynamic analysis results.

[0067] This invention utilizes professional AQWA hydrodynamic analysis software to enhance the professionalism and accuracy of platform hydrodynamic analysis, enabling a more realistic simulation of the platform's stress conditions in the marine environment. By meshing the platform model and precisely setting various basic parameters, the calculation results of the hydrodynamic analysis are more closely aligned with reality, providing reliable data support for verifying the platform's dynamic stability. Furthermore, by setting parameters according to the target application sea area, the analysis results become more targeted, effectively guiding the platform's application design in specific sea areas.

[0068] In some embodiments, in step S5, the marine environmental parameters of the target application sea area include wave frequency interval, wave direction, wind speed, and ocean current speed. The wind-wave-current coupled load analysis needs to cover the entire wind-wave-current injection angle range of 0° to 180° to verify whether the wind tilt angle of the platform meets the dynamic stability specification requirements under different angles of attack.

[0069] It should be noted that, in conjunction with the actual marine environment of the target application area, marine environmental parameters such as wave frequency interval, wave direction, wind speed, and ocean current speed are collected and set. Wind-wave-current coupled load analysis is carried out covering the entire wind-wave-current injection angle range from 0° to 180°. The stress situation of the platform under different combinations of wave direction, wind speed, and ocean current speed is simulated. The dynamic stability of the platform is judged by detecting the wind tilt angle index of the platform to determine whether it meets the design requirements.

[0070] Full-range wind, wave, and jet attack angle analysis can comprehensively simulate various stress conditions that the platform may encounter in the marine environment, ensuring that the optimized platform still has good dynamic stability in complex marine environments. Combining analysis with actual marine environmental parameters of the target application area makes the verification results more consistent with the actual use scenario of the platform, improving the practicality of the design scheme. Dynamic stability is judged by wind tilt angle index. The index is clear and the judgment is intuitive, which can quickly and effectively verify the dynamic stability performance of the platform and avoid the risk of dynamic capsizing of the platform in actual operation.

[0071] In some embodiments, in step S5, the establishment of the mooring system needs to match the column layout and weight distribution of the platform to ensure the uniformity of the force on the mooring system, and the design parameters of the mooring system should be compatible with the marine environmental parameters of the hydrodynamic analysis.

[0072] It should be noted that a matching mooring system is designed based on the platform's column layout and weight distribution characteristics, so that the force points and directions of the mooring system are adapted to the platform's structural characteristics. At the same time, the design parameters of the mooring system are made consistent with the marine environmental parameters used in the hydrodynamic analysis, ensuring that the mooring system can be uniformly stressed in the marine environment and fully exert its auxiliary role in fixing and stabilizing the platform.

[0073] A mooring system adapted to the platform's column layout and weight distribution ensures more even stress distribution, preventing damage caused by localized overload and extending its service life and operational reliability. Mooring system parameters aligned with marine environmental parameters allow the system to fully exert its role in securing and stabilizing the platform, further guaranteeing its dynamic stability in complex marine environments. The customized mooring system design ensures a closer fit between the system and the platform, simplifying the installation process and reducing offshore construction costs.

[0074] In some embodiments, in step S6, if the stability index does not meet the requirements, the adjustment range of the design diameter of the stern column 2 is 0.2~0.5m / time, and the diameter ratio of the bow column 1 to the stern column 2 after adjustment is still maintained in the range of 1~1.3 times.

[0075] It should be noted that when the platform's stability indicators do not meet the design requirements, the design diameter of the stern column 2 is fine-tuned in increments of 0.2 to 0.5 meters. Even after adjustment, the diameter ratio of the bow and stern columns remains within the design range of 1 to 1.3. Through small-scale iterative parameter adjustments, while adhering to the core principle of differentiated design, the platform's dimensional parameters are gradually adapted to stability requirements, ultimately achieving the dual goals of column optimization and stability compliance. The 0.2 to 0.5-meter increment allows for more precise adjustment of the stern column 2 diameter, avoiding repeated trial and error due to large adjustments and improving the efficiency of the optimization design. Maintaining the bow-stern column diameter ratio within the 1 to 1.3 range after adjustment ensures adherence to the core principle of differentiated design, guaranteeing that the design goal of reducing steel consumption remains unchanged. Through iterative parameter adjustments, the platform's dimensional parameters are highly adapted to stability requirements, ensuring that the final design parameters simultaneously meet the platform's economic and stability needs.

[0076] To make the technical solution of the present invention clearer and more specific, the present invention will be further described in detail below with reference to specific embodiments:

[0077] Example:

[0078] Reference Figures 1 to 8 An optimization method for the masts of a floating wind turbine platform is disclosed, applied to an 18MW three-mast floating wind turbine platform, with the target sea area being the South China Sea. The three-mast floating wind turbine platform includes a bow mast 1 for connecting the wind turbine, two symmetrically arranged stern masts 2, cross braces 3 connecting the masts, and heave plates 4 located below the masts. The optimization method specifically includes the following steps:

[0079] S1. Determine the basic design parameters of the floating wind power platform. Based on the maximum operating requirements of the 18MW wind turbine, determine the reference diameter of the bow column 1 as 15.8m and the uniform height of all columns as 29m. The bow column 1 is the main load-bearing column that supports the wind turbine and is the core load-bearing structure of the platform.

[0080] S2. The diameter of the stern column 2 is differentiated. The two stern columns 2 are designed as equal diameter structures with a design diameter of 13m. At this time, the diameter ratio of the bow column 1 to the stern column 2 is 1.215 times, which is within the design range of 1 to 1.3 times. This achieves differentiated optimization while ensuring the support balance of the platform.

[0081] S3. Based on the column size parameters obtained in steps S1 and S2, a three-dimensional solid model of the 18MW floating wind power platform is built using 3D modeling software. At the same time, the matching design parameters of the heave plate 4 are determined: the horizontal distance from the bow column 1 and the stern column 2 to the edge of the heave plate 4 is maintained at 3.5m; the diameter of the section of the heave plate 4 corresponding to the bow column 1 is designed to be 11.4m; the diameter of the section of the heave plate 4 corresponding to the stern column 2 is designed to be 10m; the arc of the heave plate 4 is designed to be adapted according to the distance from the column to the edge; the centers of the three columns are distributed in an equilateral triangle, the distance between the centers of each column is equal, and each column is rigidly connected by the cross brace 3 to form an integral column support structure to ensure the overall stress performance of the columns;

[0082] S4. Perform hydrostatic and initial stability calculations and analyses on the completed three-dimensional solid model of the floating wind power platform. Obtain hydrostatic characteristic parameters such as displacement, center of gravity position, center of buoyancy position, transverse metacentric height, longitudinal metacentric height, initial metacentric height (GM value), and recovery stiffness through floating body statics calculation software. The verification standard is that the initial metacentric height (GM value) of the platform under operating conditions is greater than the lower limit of the GM value specified in the design code for floating platforms in marine engineering. In this embodiment, the GM value of the optimized platform is greater than the specified value, proving that the differentiated design of the column diameter meets the static stability requirements, and the recovery stiffness of the platform does not decrease, thus not impairing the platform's static recovery capability.

[0083] It should be noted that, referring to Figure 8 The diagram shown illustrates the static calculation of the floating body. Stability is the first step in the initial design. Figure 8 In the diagram, point B is the center of buoyancy, point G is the center of gravity, and point M is the center of stability. Based on the calculation results, and by comparing it with the traditional equal-diameter scheme, the GM value is greater than the standard value under operating conditions. This proves from a fundamental design principle that the differentiated column diameter design meets the static stability requirements and does not impair the recovery capability.

[0084] S5. Hydrodynamic analysis was performed on the platform model that met the static stability requirements. AQWA hydrodynamic analysis software was used. The three-dimensional solid model of the platform was imported into the software and meshed. Basic parameters such as water depth in the South China Sea, overall center of gravity coordinates of the platform, and moment of inertia were set. At the same time, a mooring system 5 was established to match the platform's column layout and weight distribution to ensure the uniformity of stress on the mooring system 5. Marine environmental parameters such as wave frequency interval, wave direction, wind speed and current speed in the South China Sea were set for frequency domain calculation. Wind and current loads were calculated, and wind-wave-current coupling analysis was performed within the full wind-wave-current injection angle range of 0° to 180°. The verification results showed that the wind tilt angle of the platform met the dynamic stability requirements in the marine engineering design code.

[0085] S6. In this embodiment, the static and dynamic stability of the platform model meet the design requirements. Therefore, the column size parameters are determined to be the final column design parameters for the 18MW floating wind power platform, namely, bow column 1 diameter 15.8m, stern column 2 diameter 13m, and column height 29m.

[0086] In another embodiment of the present invention, if the dynamic stability index of the platform is found to be unsatisfactory in the hydrodynamic analysis in step S5, the process returns to step S2, and the design diameter of the stern column 2 is adjusted by 0.3m / time, so that the design diameter of the stern column 2 is adjusted to 13.3m. At this time, the diameter ratio of the bow column 1 to the stern column 2 is 1.188 times, which is still within the design range of 1 to 1.3 times. Then, steps S3 to S6 are repeated to rebuild the platform model, perform hydrostatic and initial stability analysis, and hydrodynamic analysis until the static stability and dynamic stability of the platform meet the design requirements.

[0087] The optimization method in this embodiment differentiates the column design based on the actual operating conditions of the 18MW three-column floating wind turbine platform. After optimization, the amount of steel used in the two stern columns 2 is significantly reduced. According to calculations, compared with the traditional equal-diameter column design, the amount of steel used is reduced by about 20%, which directly reduces the material and manufacturing costs of the platform. At the same time, the optimized column structure reduces the overall volume and weight of the platform while ensuring stability, making the platform's manufacturing, transportation and offshore installation processes simpler and greatly improving the efficiency of engineering construction.

[0088] The optimization method of this invention is not limited to 18MW floating wind power platforms, but can also be adapted to three-column floating wind power platforms with different power turbines. It only requires adjusting the reference diameter of the bow column 1 according to the maximum operating requirements of the wind turbine, and then designing the diameter of the stern column 2 according to a diameter ratio of 1 to 1.3. The optimization design of the columns of floating wind power platforms of different specifications can be realized through hydrostatic and hydrodynamic analysis. It has a wide range of application scenarios.

[0089] Compared with the prior art, the present invention has the following significant advantages:

[0090] 1. The floating wind power platform column optimization method of the present invention breaks away from the traditional design concept of equal-diameter columns. Taking into account the difference in actual working conditions where the bow column is the main load-bearing column of the wind turbine and the stern column is relatively less stressed, the column diameter is differentiated. The two stern columns are designed to have the same diameter but smaller than the bow column diameter. Structural optimization is achieved within the diameter ratio range of 1 to 1.3 times, which greatly reduces the amount of steel used in the stern column, directly reducing the material cost and manufacturing cost of the platform, while also having good environmental protection properties.

[0091] 2. This invention achieves dual verification of platform stability through precise hydrostatic and initial stability calculations and full-condition hydrodynamic, wind, wave and current coupling analysis. It ensures that the optimized column structure meets both static and dynamic stability requirements and marine engineering design specifications. From both design principles and engineering analysis perspectives, it guarantees that the core performance of the platform will not be diminished, thus resolving the contradiction between optimized design and platform stability.

[0092] 3. The optimization method of the present invention has a matching design for the heave plate to be adapted to the size of the columns, so that the distance from the bow and stern columns to the edge of the heave plate is consistent, and the arc structure of the heave plate is adapted to the columns, ensuring the uniformity of the force on the bottom of the platform; at the same time, the diameter of the optimized stern column is reduced, which reduces the overall volume and weight of the platform, simplifies the platform manufacturing, transportation and offshore installation process, and improves the convenience of engineering construction.

[0093] 4. The optimization method of this invention has clear steps and strong operability. Through parametric design and multiple verification iterations, it can be adapted to the column design of three-column floating wind power platforms with different power wind turbines and different marine environments. It has a wide range of application scenarios and promotion value, and provides a practical and feasible technical solution for the lightweight and economical design of floating wind power platforms.

[0094] The technical solutions provided by the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of the present invention. The descriptions of the embodiments above are only for helping to understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the embodiments of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. An optimization method for the columns of a floating wind turbine platform, applied to a three-column floating wind turbine platform, wherein the three-column floating wind turbine platform includes a bow column for connecting the wind turbine, two symmetrically arranged stern columns, a cross brace connecting the bow column and the stern columns, and a sway plate disposed below the bow column and the stern columns, characterized in that, The optimization method includes the following steps: S1. Determine the basic design parameters of the floating wind power platform, and determine the reference diameter and uniform height of the bow column based on the maximum working condition requirements. The bow column is the main load-bearing column that supports the wind turbine. S2. Design the stern pillars with different diameters, design the two stern pillars with equal diameters, and make the design diameter of the stern pillars smaller than the reference diameter of the bow pillars, so that the diameter ratio of the bow pillars to the stern pillars is in the range of 1 to 1.3 times. S3. Based on the column size parameters in steps S1 and S2, build a three-dimensional solid model of the floating wind power platform, and at the same time determine the matching design parameters of the heave plate so that the horizontal distance from the bow column and stern column to the edge of the heave plate is consistent, and the arc structure of the heave plate is adapted to the horizontal distance from the column to the edge. S4. Perform hydrostatic and initial stability calculations and analyses on the completed three-dimensional solid model of the floating wind power platform, obtain the hydrostatic characteristic parameters of the platform, and verify whether the static stability of the platform meets the specifications. S5. Perform hydrodynamic analysis on the platform model that meets the static stability requirements, establish the platform's mooring system, and combine the marine environmental parameters of the target application sea area to conduct time-domain and frequency-domain wind-wave-current coupled load analysis to verify whether the platform's dynamic stability meets the design requirements. S6. If the static and dynamic stability of the platform model meet the requirements, then the column size parameter is determined as the final column design parameter of the floating wind power platform; if any stability index does not meet the requirements, return to step S2, adjust the design diameter of the stern column, and repeat steps S3 to S6 until all stability indexes meet the design requirements.

2. The optimization method for the support column of a floating wind power platform according to claim 1, characterized in that, In step S1, the design value for the uniform height of the bow column and the stern column is 29m, and the design value for the reference diameter of the bow column is 15.8m.

3. A method of optimizing a column of a floating wind platform according to claim 2, characterized in that, In step S2, the design diameter of the stern pillar is 13m, and the diameter ratio of the bow pillar to the stern pillar is 1.

215.

4. The method of optimizing a column of a floating wind platform according to claim 1, wherein, In step S3, the horizontal distance from the bow column and stern column to the edge of the heave plate is 3.5m, the diameter of the heave plate segment corresponding to the bow column is 11.4m, and the diameter of the heave plate segment corresponding to the stern column is 10m.

5. The method of optimizing a column of a floating wind platform according to claim 1, wherein, In step S3, the centers of the three columns are distributed in an equilateral triangle, the distance between the centers of each column is equal, and each column is rigidly connected by a cross brace.

6. The method of optimizing a column of a floating wind platform of claim 1, wherein, In step S4, the hydrostatic characteristic parameters include displacement, center of gravity position, center of buoyancy position, initial metacenter height (GM) value, and recovery stiffness. The verification standard for static stability is that the initial metacenter height (GM) value of the platform under operating conditions is greater than the lower limit of the GM value specified in the design code for floating platforms in marine engineering, and the recovery stiffness of the platform does not decrease.

7. The method of optimizing a column of a floating wind platform according to claim 1, wherein, In step S5, the hydrodynamic analysis is performed using AQWA hydrodynamic analysis software. The three-dimensional solid model of the platform is imported into the AQWA hydrodynamic analysis software and meshed. At the same time, basic parameters such as water depth, overall center of gravity coordinates, and moment of inertia of the target application sea area are set.

8. The method of optimizing a column of a floating wind platform of claim 1, wherein, In step S5, the marine environmental parameters of the target application sea area include wave frequency interval, wave direction, wind speed, and ocean current speed. The wind-wave-current coupled load analysis covers the entire wind-wave-current injection angle range of 0° to 180°.

9. The method of optimizing a column of a floating wind platform according to claim 1, wherein, In step S5, the design parameters of the mooring system are adapted to the platform's column layout, weight distribution, and marine environmental parameters from hydrodynamic analysis to ensure the uniformity of stress on the mooring system.

10. The method of optimizing a column of a floating wind platform of claim 1, wherein, In step S6, if the stability index does not meet the requirements, the adjustment range of the stern column design diameter is 0.2~0.5m / time, and the ratio of the diameter of the bow column to the diameter of the stern column after adjustment is still maintained in the range of 1~1.3 times.

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