Offshore wind turbine generator-foundation integrated structure optimization method, equipment and medium

Abstract

The invention discloses an offshore wind turbine generator-foundation integrated structure optimization method, equipment and a medium. The method comprises the following steps: step 1, establishing an overall model of the wind generating set, determining and updating environmental parameters of a machine location point, and determining water depth and foundation rigidity of the machine location point; the machine site environment parameters comprise wind resource parameters, marine hydrological parameters and engineering geological parameters; the overall model comprises a machine head, a tower and a foundation, a supporting structure adopts a four-layer jacket structure, and the bottom of the tower is connected with a jacket through four inclined struts and four cross struts; 2, analyzing the rationality of the current design, and judging whether a plurality of control conditions are single control factors or not; and 3, if any control condition is a single control factor, performing corresponding processing, and repeating the steps 2-3 until each control condition is not a single control factor, thereby completing the design. The offshore motor set-foundation integrated structure is optimized, and the purposes of weight reduction and cost reduction are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power generation, and more particularly, to an optimization method, device and medium for an integrated structure of an offshore wind turbine and a foundation. Background Art

[0002] Currently, the development of offshore wind power is facing the pressure of cost reduction and is still far from achieving grid parity. Among the total investment costs of offshore wind power, the wind turbine support structure (including the tower and the foundation) accounts for about 22%. Reducing the cost of the offshore wind power support structure can effectively reduce the cost per kilowatt-hour. In China, the design of offshore wind power is divided into two parts, that is, the part above the tower is designed according to the wind power industry standard, and the part below the tower is designed according to the offshore engineering standard. In the past, most wind turbine manufacturers and design institutes adopted the step-by-step iteration method for design. In the step-by-step iteration method, the design and optimization of the tower and the foundation are carried out successively and are two independent design domains, and the goal is to find the optimal design in their respective design domains (tower or foundation). Since the load calculation and tower design are carried out first, the optimization goal of the step-by-step iteration method is the local optimal design with the lightest tower, rather than the global optimal design with the lightest overall support structure.

[0003] There is still a need to develop an optimization method for the integrated structure of an offshore wind turbine and a foundation.

[0004] The information disclosed in the background art part of the present invention is only intended to deepen the understanding of the general background art of the present invention, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] The present invention provides an optimization method, device and medium for an integrated structure of an offshore wind turbine and a foundation, which optimize the integrated structure of the offshore wind turbine and the foundation to achieve the purpose of weight reduction and cost reduction.

[0006] In a first aspect, an embodiment of the present disclosure provides an optimization method for an integrated structure of an offshore wind turbine and a foundation, including:

[0007] Step 1: Establish an overall model of the wind turbine generator set, determine the updated environmental parameters of the machine location point, and determine the water depth and foundation stiffness of the machine location point; the environmental parameters of the machine location point include wind resource parameters, marine hydrological parameters, and engineering geological parameters; the overall model includes the machine head, the tower, and the foundation, and the support structure adopts a four-layer jacket structure, and the bottom of the tower and the jacket are connected by 4 diagonal braces and 4 cross braces;

[0008] Step 2: Analyze the rationality of the current design and determine whether multiple control conditions are a single control factor;

[0009] Step 3: If any control condition is a single control factor, perform corresponding processing, and repeat Steps 2-3 until each control condition is not a single control factor, and the design is completed.

[0010] Preferably, the design rationality includes: the current design is restricted by frequency requirements, and there are margins for other ultimate strength, fatigue strength, and deformation requirements.

[0011] Preferably, the multiple control conditions include ultimate strength, fatigue strength, deformation requirements, frequency requirements, and other factors.

[0012] Preferably, the corresponding processing includes integrated load processing, mud surface cumulative deformation algorithm processing, tower configuration adjustment, jacket pipe diameter adjustment, frequency range adjustment, geological exploration parameter processing, increasing the diameter and thickness, and shortening the pile length below the mud surface.

[0013] Preferably, Step 3 includes:

[0014] If the ultimate strength or fatigue strength is a single control factor, perform the integrated load processing;

[0015] If the deformation requirement is a single control factor, perform the integrated load processing and the mud surface cumulative deformation algorithm processing;

[0016] If the frequency requirement is a single control factor, perform the tower configuration adjustment, the jacket pipe diameter adjustment, the frequency range adjustment, and the geological exploration parameter processing;

[0017] If other factors are a single control factor, increase the diameter and thickness and shorten the pile length below the mud surface.

[0018] Preferably, the integrated load processing includes:

[0019] Model the jacket in SACS and export it in a format recognized by Bladed;

[0020] Combine the nacelle, tower, and foundation models into a whole in Bladed;

[0021] Input wind resource parameters, ocean hydrological parameters, and mud surface stiffness in Bladed;

[0022] According to the operating state of the unit, combine different environmental parameters, control parameters, and unit operating conditions, and conduct grouped statistics on extreme conditions.

[0023] Preferably, the tower configuration adjustment includes:

[0024] Calculate the static strength safety factor of the cylinder wall:

[0025]

[0026] Among them: γ M is the material safety factor; f y,k is the yield strength of the material, σ v is the equivalent stress on each cross-section of the tower;

[0027] Based on the thin shell theory, the stability analysis of the tower is carried out, and the stability under axial pressure, shear stress, circumferential pressure and the combined action of the above three stresses is calculated:

[0028]

[0029]

[0030]

[0031]

[0032] Among them: σ x,Rd is the critical stress value of axial instability of the cylindrical shell; σ x,Ed is the calculated stress value of axial instability of the cylindrical shell; τ x,Rd is the critical stress value of actual shear instability of the cylindrical shell; τ x,Ed is the calculated stress value of shear instability of the cylindrical shell; σ θ,Rd is the critical stress value of circumferential instability of the cylindrical shell; σ θ,Ed is the calculated stress value of circumferential instability of the cylindrical shell; k x , kτ, kθ, k i is a dimensionless parameter;

[0033] The nominal stress method is used to calculate the fatigue of the tower welds. Based on the obtained Markov matrix and S-N curve, the cumulative fatigue damage of the tower welds is obtained, and then the fatigue safety factor of the tower welds is calculated:

[0034] SRF6 ≥ 1.

[0035] Preferably, the adjustment of the jacket pipe diameter includes:

[0036] The vertical bearing capacity check of the jacket foundation is calculated as:

[0037] Q E ≤ Q d

[0038] Among them: Q d is the design value of the axial bearing capacity of the driven pile; Q E is the calculated value of the axial bearing capacity of the driven pile;

[0039] For cylindrical members subjected to combined compression and bending, combined tension and bending, and simultaneous axial tension and circumferential compression, at all points along its entire length, it satisfies:

[0040] UC ≤ 1

[0041] Perform fatigue analysis on the jacket foundation structure. According to the Markov matrix and the S - N curve, the cumulative fatigue damage of the weld can be obtained. The fatigue damage value Damage of the single - pile weld satisfies:

[0042] Damage ≤ 1

[0043] The verticality after the pile driving of the pile body is controlled within 0.25°. Therefore, when calculating, the allowable value △θ of the permanent cumulative mud - surface rotation angle of the pile foundation is 0.25°.

[0044] In a second aspect, an embodiment of the present disclosure further provides an electronic device, which includes:

[0045] A memory storing executable instructions;

[0046] A processor that runs the executable instructions in the memory to implement the above - mentioned optimization method for the integrated structure of the offshore wind turbine - foundation.

[0047] In a third aspect, an embodiment of the present disclosure further provides a computer - readable storage medium, which stores a computer program. When the computer program is executed by a processor, it implements the above - mentioned optimization method for the integrated structure of the offshore wind turbine - foundation.

[0048] Its beneficial effects are as follows:

[0049] 1. Compared with the traditional sub - iterative method, the design process is greatly simplified, and the design cycle is shortened;

[0050] 2. Compared with the traditional sub - iterative method, the situation of repeated consideration of loads can be effectively avoided;

[0051] 3. The global optimal design with the lightest overall support structure can be found, which is an effective method to reduce the cost per kilowatt - hour of offshore wind power.

[0052] The method and device of the present invention have other characteristics and advantages, which will be obvious from the accompanying drawings incorporated herein and the subsequent detailed implementation manners, or will be described in detail in the accompanying drawings incorporated herein and the subsequent detailed implementation manners. These accompanying drawings and detailed implementation manners are used together to explain the specific principles of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] By describing the exemplary embodiments of the present invention in more detail in conjunction with the accompanying drawings, the above - mentioned and other objects, features, and advantages of the present invention will become more obvious. Among them, in the exemplary embodiments of the present invention, the same reference numerals generally represent the same components.

[0054] Figure 1 The flowchart shows the steps of an optimization method for the integrated structure of an offshore wind turbine and its foundation according to an embodiment of the present invention.

[0055] Figure 2 The schematic diagram shows the integrated full-coupling calculation process of an offshore wind turbine according to an embodiment of the present invention.

[0056] Figure 3 The schematic diagram shows the Bladed model of an offshore fixed wind turbine according to an embodiment of the present invention.

[0057] Figure 4 The schematic diagram shows the tower coordinate system according to an embodiment of the present invention. Detailed implementation manners

[0058] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein.

[0059] To facilitate the understanding of the solutions and effects of the embodiments of the present invention, three specific application examples are given below. Those skilled in the art should understand that these examples are only for facilitating the understanding of the present invention, and any specific details are not intended to limit the present invention in any way.

[0060] Example 1

[0061] Figure 1 The flowchart shows the steps of an optimization method for the integrated structure of an offshore wind turbine and its foundation according to the present invention.

[0062] As Figure 1 shown, the optimization method for the integrated structure of an offshore wind turbine and its foundation includes:

[0063] Step 1: Establish an overall model of the wind turbine generator set, determine the updated environmental parameters at the machine location, and determine the water depth and foundation stiffness at the machine location; the environmental parameters at the machine location include wind resource parameters, ocean hydrological parameters, and engineering geological parameters; the overall model includes the machine head, tower, and foundation, and the support structure adopts a four-layer jacket structure, and the bottom of the tower and the jacket are connected by 4 diagonal braces and 4 cross braces;

[0064] Step 2: Analyze the rationality of the current design and determine whether multiple control conditions are a single control factor;

[0065] Step 3: If any control condition is a single control factor, perform corresponding processing, and repeat steps 2-3 until each control condition is not a single control factor, and the design is completed.

[0066] In one example, the design rationality includes that the current design is constrained by frequency requirements, and there are margins for other ultimate strength, fatigue strength, and deformation requirements.

[0067] In one example, the multiple control conditions include ultimate strength, fatigue strength, deformation requirements, frequency requirements, and other factors.

[0068] In one example, the corresponding processing includes integrated load processing, mud surface cumulative deformation algorithm processing, tower configuration adjustment, jacket pipe diameter adjustment, frequency range adjustment, geological exploration parameter processing, increasing the diameter thickness, and shortening the pile length below the mud surface.

[0069] In one example, step 3 includes:

[0070] If the ultimate strength or fatigue strength is the single control factor, then perform integrated load processing;

[0071] If the deformation requirement is the single control factor, then perform integrated load processing and mud surface cumulative deformation algorithm processing;

[0072] If the frequency requirement is the single control factor, then perform tower configuration adjustment, jacket pipe diameter adjustment, frequency range adjustment, and geological exploration parameter processing;

[0073] If other factors are the single control factor, then increase the diameter thickness and shorten the pile length below the mud surface.

[0074] In one example, the integrated load processing includes:

[0075] Model the jacket in SACS and export it in the format recognized by Bladed;

[0076] In Bladed, combine the nacelle, tower, and foundation models into a whole;

[0077] Input the wind resource parameters, ocean hydrological parameters, and mud surface stiffness in Bladed;

[0078] According to the operating state of the unit, combine different environmental parameters, control parameters, and the operating conditions of the unit, and conduct grouped statistics on the extreme conditions.

[0079] In one example, the tower configuration adjustment includes:

[0080] Calculate the safety factor of the static strength of the cylinder wall:

[0081]

[0082] Where: γ M is the material safety factor; f y,k is the yield strength of the material, σ v is the equivalent stress on each section of the tower;

[0083] Based on the thin shell theory, the stability analysis of the tower is carried out, and the stability under axial pressure, shear stress, circumferential pressure and the combined action of the above three stresses is calculated:

[0084]

[0085]

[0086]

[0087]

[0088] Where: σ x,Rd is the critical stress value of axial instability of the cylindrical shell; σ x,Ed is the calculated stress value of axial instability of the cylindrical shell; τ x,Rd is the actual critical stress value of shear instability of the cylindrical shell; τ x,Ed is the calculated stress value of shear instability of the cylindrical shell; σ θ,Rd is the critical stress value of circumferential instability of the cylindrical shell; σ θ,Ed is the calculated stress value of circumferential instability of the cylindrical shell; k x , kτ, kθ, k i are dimensionless parameters;

[0089] The nominal stress method is used to calculate the fatigue of the tower welds. According to the obtained Markov matrix and S-N curve, the cumulative fatigue damage of the tower welds is obtained, and then the fatigue safety factor of the tower welds is calculated:

[0090] SRF6 ≥ 1.

[0091] In one example, the jacket pipe diameter adjustment includes:

[0092] Calculating the vertical bearing capacity check of the jacket foundation as:

[0093] Q E ≤ Q d

[0094] Where: Q d is the design value of the axial bearing capacity of the driven pile; Q E is the calculated value of the axial bearing capacity of the driven pile;

[0095] For cylindrical members under combined compression and bending, combined tension and bending, and simultaneous axial tension and circumferential compression, at all points along its entire length, it satisfies:

[0096] UC ≤ 1

[0097] Perform fatigue analysis on the jacket foundation structure. According to the Markov matrix and S-N curve, the cumulative fatigue damage of the weld can be obtained. The fatigue damage value Damage of the monopile weld satisfies:

[0098] Damage≤1

[0099] The verticality after pile driving is controlled within 0.25°. Therefore, when calculating, the allowable value △θ of the permanent cumulative mud surface rotation angle of the pile foundation is 0.25°.

[0100] Specifically, the present invention mainly conducts integrated load simulation on the offshore wind turbine - foundation, checks and optimizes the tower and foundation structures, and seeks the global optimal design with the lightest overall support structure.

[0101] There are two existing mature simulation design methods. One is the full - coupling method, and the other is the semi - coupling method. The two are divided according to the range of calculated loads. The full - coupling method completely relies on wind power software to calculate the loads of wind, wave, and current, while the semi - coupling method calculates the loads of wave and current by marine engineering software. The integrated calculation method adopted by the present invention is the full - coupling calculation method.

[0102] Figure 2 Shows a schematic diagram of the integrated full - coupling calculation process of an offshore wind turbine according to an embodiment of the present invention.

[0103] The full - coupling method is to establish the unit and the offshore support mechanism in the dynamic simulation software of the wind turbine generator set, simulate all the working conditions specified in the wind power standard IEC 61400, and then output the load time series. Establish the offshore structure model in the marine engineering program, read its load time series, and conduct compliance check calculations. The calculation process is shown in Figure 2 Shown. In this method, the marine engineering program does not calculate wave or wind loads, but only performs post - processing on the loads of the wind power software.

[0104] Based on the offshore fixed - type wind turbine generator set model in IEA Task30 OC4, a comparative calculation was carried out using the Bladed4.3 and SACS coupling method. The detailed parameters of the unit model are shown in Table 1.

[0105] Table 1

[0106]

[0107]

[0108] Figure 3 Shows a schematic diagram of the Bladed model of an offshore fixed - type wind turbine generator set according to an embodiment of the present invention.

[0109] Establish the overall model of the wind turbine generator set in the Bladed software, asFigure 3 As shown, the support structure adopts a four - layer jacket structure, and the bottom of the tower and the jacket are connected by 4 diagonal braces and 4 cross braces.

[0110] Analyze the rationality of the current design. The current design is restricted by frequency requirements, and there are margins for other requirements such as ultimate strength, fatigue strength, and deformation. Determine whether multiple control conditions are a single control factor. The multiple control conditions include ultimate strength, fatigue strength, deformation requirements, frequency requirements, and other factors.

[0111] If the ultimate strength or fatigue strength is the single control factor, then perform integrated load processing; if the deformation requirement is the single control factor, then perform integrated load processing and mud - surface cumulative deformation algorithm processing; if the frequency requirement is the single control factor, then perform tower configuration adjustment, jacket pipe diameter adjustment, frequency range adjustment, and geological exploration parameter processing; if other factors are the single control factor, then increase the diameter thickness and shorten the pile length below the mud surface.

[0112] The integrated load processing includes:

[0113] Model the jacket in SACS and export it in a format recognized by Bladed;

[0114] In Bladed, combine the nacelle, tower, and foundation models into a whole;

[0115] Input wind resource parameters, ocean hydrological parameters, and mud - surface stiffness in Bladed.

[0116] According to the operating state of the unit, combine different environmental parameters, control parameters, and unit operating conditions. It can be divided into 8 categories of operating condition combinations (DLC, Design Load Case), namely normal power generation, power generation + fault condition, start - up condition, shutdown condition, emergency shutdown, idling, idling + fault, and operation and maintenance.

[0117] For the post - processing of ultimate loads, according to the requirements of IEC61400 - 3 standard, it is necessary to group and count the ultimate conditions: for the steady - state wind condition and gust condition, directly participate in the extreme value statistics with a single condition; for the turbulent wind condition with 6 seeds, take 12 conditions with different seeds at the same wind speed as a group, select the condition closest to the average result of this group as the target condition, and then participate in the extreme value statistics; for the turbulent wind condition with 12 seeds, take 12 conditions with different seeds at the same wind speed as a group, select the condition closest to the average result of 6 conditions from the first 6 conditions in each group as the target condition, and then participate in the extreme value statistics. Affected by the different directions of wind and wave, in the design of offshore towers, in addition to being affected by ΔMy, the influence of ΔMx cannot be ignored. Therefore, both of these two loads need to be considered simultaneously in fatigue calculation. Table 2 gives the safety factors of ultimate loads.

[0118] Table 2

[0119]

[0120] Figure 4 Shows a schematic diagram of the tower coordinate system according to an embodiment of the present invention.

[0121] Figure 4 The tower coordinate system for calculating the loads of an offshore wind turbine is given, where: the origin is located at the intersection of the tower axis and the foundation plane; XF is the horizontal direction; ZF is the vertically upward direction along the tower axis; YF is the horizontal direction pointing sideways.

[0122] Considering the influence of different wind and wave directions, the influence of Mx and My should be considered in the fatigue calculation of offshore tower welds and monopile seams. First, project the load time series of Mx and My changing with time onto the circumferential direction of the tower, with the projection angle being [0, 2π]. Obtain the load time history components in different coordinate systems according to the method shown above, and then perform rain flow calculation according to the traditional method to obtain the Markov matrix in each direction.

[0123] The present invention only conducts checking and optimization design on the main structures of the tower and jacket. The main checks for the tower structure body mainly include: static strength of the tower barrel wall, tower stability, and fatigue strength check of the tower welds.

[0124] The static strength of the tower barrel wall is determined according to the fourth strength theory. The safety factor for calculating the static strength of the barrel wall is:

[0125]

[0126] Where: γ M Is the material safety factor; f y,k Is the yield strength of the material, and σ v Is the equivalent stress on each section of the tower.

[0127] For the full penetration butt weld tower welds with a quality grade of first class, non-destructive testing is required. According to DIN18800-1, the static strength of the connection part of the welds meeting this quality requirement is determined by the base material, and there is no need to calculate the static strength of the welds.

[0128] The tower stability analysis adopts the standard DIN EN 1993-1-6. The stability analysis of the steel tower is based on the thin shell theory, and the stability under axial pressure, shear stress, circumferential pressure, and the combined action of the above three stresses is calculated. The calculation formulas for the stability safety factor of the cylindrical shell under the action of axial pressure, shear force, circumferential pressure, and the combined action of these three forces, and the condition for the cylindrical shell not to undergo axial instability are:

[0129]

[0130]

[0131]

[0132]

[0133] where: σ x,Rd is the critical stress value of axial instability of the cylindrical shell; σ x,Ed is the calculated stress value of axial instability of the cylindrical shell; τ x,Rd is the critical stress value of actual shear instability of the cylindrical shell; τ x,Ed is the calculated stress value of shear instability of the cylindrical shell; σ θ,Rd is the critical stress value of circumferential instability of the cylindrical shell; σ θ,Ed is the calculated stress value of circumferential instability of the cylindrical shell; k x , kτ, kθ, k i are dimensionless parameters.

[0134] The nominal stress method is adopted for the fatigue calculation of the tower welds. There are three types of tower welds, namely longitudinal welds, transverse welds and internal attachment welds. The most unfavorable fatigue design grade among the three is selected during the calculation. The fatigue cumulative damage of the tower welds can be obtained based on the obtained Markov matrix and S-N curve. The fatigue safety factor of the tower welds shall satisfy:

[0135] SRF6 ≥ 1.

[0136] The main checks for the jacket foundation structure body include: axial bearing capacity, check of the UC value of the joint under extreme conditions, fatigue strength and mud surface rotation check.

[0137] The checking formula for the vertical bearing capacity of the jacket foundation is:

[0138] Q E ≤ Q d

[0139] where: Q d is the design value of the axial bearing capacity of the driven pile; Q E is the calculated value of the axial bearing capacity of the driven pile.

[0140] For cylindrical members subjected to combined compression and bending, combined tension and bending, and simultaneous axial tension and circumferential compression, at all points along its entire length, it shall satisfy:

[0141] UC ≤ 1

[0142] The fatigue analysis of the jacket foundation structure shall comply with the relevant provisions of the current national standard "Recommended Practice for Fatigue Strength Analysis of Offshore Steel Structures" (SY / T 10049). The cumulative fatigue damage of the weld can be obtained based on the Markov matrix and the S-N curve. The fatigue damage value Damage of the single-pile weld shall satisfy:

[0143] Damage≤1

[0144] According to the DNVGL-ST-0126 specification, the total rotation angle at the mudline of the single pile shall not exceed 0.5°, including the installation deviation angle of the single-pile body at the mudline and the permanent cumulative rotation deformation. It is generally considered that the verticality of the pile body after pile driving is controlled within 0.25° (i.e., the installation deviation angle is 0.25°). Therefore, the allowable value △θ of the permanent cumulative mudline rotation angle of the pile foundation during calculation is 0.25°, that is:

[0145] Δ θ ≤0.25°

[0146] In addition, the following three indicators need to be checked for the deformation of the single pile:

[0147] a) The horizontal displacement at the mudline does not exceed L / 500 (L is the penetration depth of the pile);

[0148] b) The displacement at the pile tip does not exceed the allowable value (usually taking the smaller value of L / 5000 and 10 mm as the allowable value);

[0149] c) The maximum settlement of the foundation does not exceed 100 mm.

[0150] Example 2

[0151] The present disclosure provides an electronic device, which includes: a memory storing executable instructions; a processor that runs the executable instructions in the memory to implement the above-mentioned optimization method for the integrated structure of the offshore wind turbine-foundation.

[0152] The electronic device according to an embodiment of the present disclosure includes a memory and a processor.

[0153] The memory is used to store non-temporary computer-readable instructions. Specifically, the memory may include one or more computer program products, and the computer program products may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory, etc. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc.

[0154] The processor can be a central processing unit (CPU) or other forms of processing units with data processing capabilities and / or instruction execution capabilities, and can control other components in the electronic device to perform desired functions. In an embodiment of the present disclosure, the processor is used to run the computer-readable instructions stored in the memory.

[0155] Those skilled in the art should understand that, in order to solve the technical problem of how to obtain good user experience effects, well-known structures such as communication buses and interfaces may also be included in this embodiment, and these well-known structures should also be included in the protection scope of the present disclosure.

[0156] For a detailed description of this embodiment, reference may be made to the corresponding descriptions in the foregoing embodiments, and details will not be repeated here.

[0157] Example 3

[0158] An embodiment of the present disclosure provides a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the optimization method for the integrated structure of an offshore wind turbine and its foundation is implemented.

[0159] According to the computer-readable storage medium of the embodiment of the present disclosure, non-temporary computer-readable instructions are stored thereon. When the non-temporary computer-readable instructions are run by a processor, all or part of the steps of the methods of the foregoing embodiments of the present disclosure are executed.

[0160] The above-mentioned computer-readable storage medium includes, but is not limited to: optical storage media (e.g., CD-ROM and DVD), magneto-optical storage media (e.g., MO), magnetic storage media (e.g., magnetic tape or removable hard disk), media with built-in rewritable non-volatile memory (e.g., memory card), and media with built-in ROM (e.g., ROM cartridge).

[0161] Those skilled in the art should understand that the purpose of the above description of the embodiments of the present invention is only to exemplarily illustrate the beneficial effects of the embodiments of the present invention, and is not intended to limit the embodiments of the present invention to any of the examples given.

[0162] The foregoing embodiments of the present invention have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.

Claims

1. An optimization method for the integrated structure of an offshore wind turbine and its foundation, characterized in that, Including: Step 1: Establish an overall model of the wind turbine generator set, determine the updated environmental parameters of the machine position point, and determine the water depth and foundation stiffness of the machine position point; the environmental parameters of the machine position point include wind resource parameters, marine hydrological parameters, and engineering geological parameters; the overall model includes the machine head, tower, and foundation, and the support structure adopts a four-layer jacket structure, and the bottom of the tower and the jacket are connected by 4 diagonal braces and 4 cross braces; Step 2: Analyze the rationality of the current design and judge whether multiple control conditions are single control factors; Step 3: If any control condition is a single control factor, perform corresponding processing, and repeat Steps 2-3 until each control condition is not a single control factor, and the design is completed.

2. The optimization method for the integrated structure of an offshore wind turbine and its foundation according to claim 1, wherein, The rationality of the design includes: the current design is restricted by frequency requirements, and there are margins for other ultimate strength, fatigue strength, and deformation requirements.

3. The optimization method for the integrated structure of an offshore wind turbine and its foundation according to claim 1, wherein, The multiple control conditions include ultimate strength, fatigue strength, deformation requirements, frequency requirements, and other factors.

4. The optimization method for the integrated structure of an offshore wind turbine and its foundation according to claim 3, wherein, The corresponding processing includes integrated load processing, mud surface cumulative deformation algorithm processing, tower configuration adjustment, jacket pipe diameter adjustment, frequency range adjustment, geological exploration parameter processing, increasing the diameter thickness, and shortening the pile length below the mud surface.

5. The optimization method for the integrated structure of an offshore wind turbine and its foundation according to claim 4, wherein, Step 3 includes: If the ultimate strength or fatigue strength is a single control factor, perform the integrated load processing; If the deformation requirement is a single control factor, perform the integrated load processing and the mud surface cumulative deformation algorithm processing; If the frequency requirement is a single control factor, perform the tower configuration adjustment, the jacket pipe diameter adjustment, the frequency range adjustment, and the geological exploration parameter processing; If other factors are single control factors, increase the diameter thickness and shorten the pile length below the mud surface.

6. The optimization method for the integrated structure of an offshore wind turbine and its foundation according to claim 5, wherein, The integrated load processing includes: Model the jacket in SACS and export it in the format recognized by Bladed; In Bladed, combine the machine head, tower, and foundation models into a whole; Input wind resource parameters, marine hydrological parameters, and mud surface stiffness in Bladed; According to the operating state of the unit, combine different environmental parameters, control parameters, and unit operating conditions, and conduct grouped statistics on extreme conditions.

7. The optimization method for the integrated structure of an offshore wind turbine and its foundation according to claim 5, wherein, The tower configuration adjustment includes: Calculate the static strength safety factor of the cylinder wall: Among them: γ M is the material safety factor; f y,k is the yield strength of the material, σ v is the equivalent stress on each section of the tower Based on the thin shell theory, conduct a stability analysis of the tower, and calculate the stability under axial pressure, shear stress, circumferential pressure, and the combined action of the above three stresses: Among them: σ x,Rd is the critical stress value for axial buckling of the cylindrical shell; σ x,Ed is the calculated stress value for axial buckling of the cylindrical shell; τ x,Rd is the critical stress value for actual shear buckling of the cylindrical shell; τ x,Ed is the calculated stress value for shear buckling of the cylindrical shell; σ θ,Rd is the critical stress value for circumferential buckling of the cylindrical shell; σ θ,Ed is the calculated stress value for circumferential buckling of the cylindrical shell; k x , kτ, kθ, k i are dimensionless parameters; Use the nominal stress method to calculate the fatigue of the tower welds, obtain the cumulative fatigue damage of the tower welds according to the obtained Markov matrix and S-N curve, and then calculate the fatigue safety factor of the tower welds: SRF6≥1.

8. The optimization method for the integrated structure of an offshore wind turbine and its foundation according to claim 5, wherein, The jacket pipe diameter adjustment includes: Calculate the vertical bearing capacity check of the jacket foundation as: Q E ≤Q d Wherein: Q d is the design value of the axial bearing capacity of the driven pile; Q E is the calculated value of the axial bearing capacity of the driven pile; For cylindrical members under the combined action of compression and bending, tension and bending, and simultaneous axial tension and circumferential compression, all points along its entire length satisfy: UC≤1 Conduct a fatigue analysis of the jacket foundation structure, and the cumulative fatigue damage of the welds can be obtained according to the Markov matrix and S-N curve. The fatigue damage value Damage of the single pile weld satisfies: Damage≤1 The verticality after the pile driving of the pile body is controlled within 0.25°, so the allowable value of the permanent cumulative mud surface rotation angle △θ of the pile foundation is 0.25° during calculation.

9. An electronic device, characterized in that, The electronic device includes: a memory storing executable instructions; a processor that runs the executable instructions in the memory to implement the method for optimizing the integrated structure of an offshore wind turbine and foundation according to any one of claims 1-8.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, it implements the method for optimizing the integrated structure of an offshore wind turbine and foundation according to any one of claims 1-8.

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