Rapid design model of main scale of floating foundation of floating wind turbines with different capacities

Abstract

The present invention discloses a main scale rapid design model of the floating foundation of floating wind turbines with different capacities, obtains relevant parameters of the impeller of a small-capacity floating wind turbine; obtains relevant parameters of the floating foundation of a small-capacity floating wind turbine; calculates the similarity ratio relationship between the impeller mass and the displacement of the floating body and the floating body scale; calculates the preliminary size parameters of the floating foundation of a large-capacity floating wind turbine through the similarity ratio; calculates the maximum pitch and static inclination angle under the condition that the maximum pitch and static inclination angles of the small-capacity wind turbine and the large-capacity wind turbine on a calm water surface are kept consistent; takes the size of each component of the floating foundation as a decision variable, and calculates the steel consumption parameters of the floating foundation of the floating wind turbine under the condition that the consumption of the floating foundation structure is just the minimum. The present invention reduces the amount of steel used in construction while ensuring that the floating foundation meets various design requirements and construction restrictions, saving economic costs; reduces the number of manual iterative modifications during the design process, improves design efficiency, and meets design safety requirements.

Description

Technical Field

[0001] The invention belongs to the technical field of offshore wind power generation, and more specifically is a main scale rapid design model of a floating body foundation of floating wind turbines with different capacities. Background Art

[0002] Offshore floating wind turbines are important equipment for utilizing deep sea wind energy. With the rapid development of offshore wind power technology, the capacity of wind turbines has gradually expanded from megawatts to 10 megawatts, and the design and experiment of 15 megawatt and 20 megawatt wind turbines have begun to be planned.

[0003] The floating foundation provides safe working conditions for the wind turbine in normal operation, typhoon, huge waves and other environments. The change of wind turbine capacity will bring about changes in parameters such as weight, impeller diameter, impeller thrust, hub height, etc., which will change the size, draft, motion inherent period and other parameters of the floating foundation. In order to ensure the safe and stable operation of the system, large-capacity wind turbines cannot use the same floating foundation as small-capacity wind turbines, and the key parameters of the floating foundation need to be redesigned. Traditional design methods usually modify, verify, modify and verify the main dimensions of the floating foundation to obtain parameters that meet the requirements. This method has a long design cycle and a large workload, which is not conducive to the rapid development of the floating wind turbine industry, and the economic efficiency may not meet the investment requirements. Summary of the invention

[0004] In order to overcome the defects of the above-mentioned background technology, the present invention provides a rapid design model of the main scales of floating wind turbine buoy foundations of different capacities, which can quickly determine the main scale parameters of a more economical large-capacity wind turbine buoy foundation through the parameters of a small wind turbine buoy foundation when the wind turbine capacity increases.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0006] The main scale rapid design model of floating wind turbine foundations with different capacities includes:

[0007] Step 1, obtaining relevant parameters of a small-capacity floating fan impeller;

[0008] Step 2, obtaining relevant parameters of the floating foundation of a small-capacity floating wind turbine;

[0009] Step 3, calculating the relationship between the impeller mass and the displacement of the floating body and the similarity ratio of the floating body size;

[0010] Step 4, calculating the preliminary size parameters of the floating foundation of the large-capacity floating wind turbine by using the similarity ratio obtained in step 3;

[0011] Step 5, calculating the maximum pitch and static inclination angle under the condition that the maximum pitch and static inclination angles of the small-capacity fan and the large-capacity fan on a calm water surface are kept consistent;

[0012] Step six, taking the size of each component of the floating foundation as the decision variable, calculate the steel consumption parameters of the floating wind turbine floating foundation under the condition that the steel consumption of the floating foundation structure is the minimum.

[0013] Preferably, in step 1, the relevant parameters of the small-capacity floating fan impeller include the impeller thrust F 0 , impeller mass M t0 ; Obtain relevant parameters of large-capacity floating wind turbine impellers, including impeller thrust F 1 , impeller mass M t1 .

[0014] Preferably, the relevant parameters of the small-capacity floating wind turbine buoy foundation in step 2 include draft D d0 , Displacement V 0 , Type length L x0 、Width L y0 、Deep L z0 , Dimensions of each component of the floating foundation Define the relevant parameters of the floating foundation of large-capacity floating wind turbines, including the draft D d1 , Displacement V 1 , Type length L x1 、Width L y1 、Deep L z1 , Dimensions of each component of the floating foundation

[0015] Preferably, in step 3, the relationship between the impeller mass and the displacement of the floating body and the similarity ratio of the floating body size is:

[0016]

[0017] Preferably, the method of calculating the preliminary size parameters of the floating body foundation of the large-capacity floating wind turbine by the similarity ratio obtained in step 3 in step 4 comprises:

[0018] L′ x1 =s×L x0 L′ y1 =s×L y0 L′ z1 =s×L z0

[0019] x′ 1 =s×x 0 y′ 1 =s×y 0 z′ 1 =s×z 0

[0020] Among them, L′ x1 The initial length of the floating foundation for large-capacity wind turbines, L′ y1The initial width of the floating foundation of a large-capacity wind turbine, L′ z1 The initial depth of the floating foundation for large-capacity wind turbines, L x0 It is a small capacity wind turbine floating foundation type, L y0 The width of the floating foundation for small-capacity wind turbines is L z0 It is a deep floating foundation type for small capacity wind turbines.

[0021] Preferably, step five calculates the maximum pitch and static inclination angle q while keeping the maximum pitch and static inclination angles of the small-capacity wind turbine and the large-capacity wind turbine consistent on a calm water surface:

[0022]

[0023] in, is the pitch hydrostatic restoring moment of the small-capacity wind turbine float. It is the pitch hydrostatic restoring moment of the large-capacity wind turbine float.

[0024] Pitch restoring moment in still water C 55 =ρ water gV(Z B -Z G )+ρ water I yy

[0025] Among them, ρ water is the density of seawater, g is the acceleration of gravity, V is the displacement of the floating body, Z B is the buoyancy center height of the floating wind turbine, Z G is the center height of the floating wind turbine, I yy is the waterline area moment of inertia relative to the y-axis of the floating body coordinate system, and the calculation formula is:

[0026]

[0027] Among them A i is the waterline area of ​​each component of the floating foundation. For components below the waterline, A i =0;L i is the distance from the center of each component to the longitudinal section of the floating foundation; is the waterplane area moment of inertia of each component relative to the y-axis of its own coordinate system;

[0028] Step 6: Taking the size of each component of the floating foundation as the decision variable, calculate the steel consumption parameters of the floating wind turbine floating foundation under the condition that the steel consumption of the floating foundation structure is the least.

[0029] Preferably, in step 6, the size of each component of the floating foundation is used as a decision variable. When the amount of the floating foundation structure is the minimum, the method for calculating the steel amount parameters of the floating wind turbine floating foundation is:

[0030] Taking the large-capacity floating wind turbine dimensions x, y, and z obtained in step 4 as the initial values, the objective function can be expressed as minf(m):

[0031] Where f(m)=∑m(x i 1 ,y i 1 ,z i 1 ), is the cumulative steel consumption of each part,

[0032] The constraint function is:

[0033]

[0034] Among them, L xlim , L ylim , L zlim The maximum length, width and depth of the floating foundation limited by the equipment; is the natural period of heave, pitch and roll of large-capacity wind turbine; [T 1 , T 2 ] is the main energy range period of the wave; D md is the diameter of the circular buoy under the wind turbine tower;

[0035] The natural period of motion is:

[0036]

[0037] Where M is the weight of the floating wind turbine including ballast, m a is the additional mass of the floating foundation under the corresponding degree of freedom, C is the motion stiffness of the floating foundation under the corresponding degree of freedom; the size x of each component of the large-capacity floating foundation can be obtained 1 ,y 1 、z 1 .

[0038] The beneficial effects of the present invention are as follows: the design model proposed by the present invention can quickly determine the scaling ratio of the floating foundation of a floating wind turbine according to the size or power of the wind turbine, and provide an initial main scale for the design of the floating foundation;

[0039] The design model proposed in the present invention can quickly determine the various dimensional parameters of the floating foundation of a large-capacity floating wind turbine, and can preliminarily meet the requirements for key parameters such as the movement period and maximum static inclination angle of the floating structure. At the same time, the constraints in the construction process such as the construction site requirements and the structural force requirements are also taken into consideration, thereby improving the design efficiency. The multi-parameter optimization analysis of the steel consumption is carried out to reduce the construction steel consumption while ensuring that the floating foundation meets various design requirements and construction restrictions, thereby saving economic costs.

[0040] The main dimensions of the floating foundation of the design model proposed in the present invention, after iterative optimization, are closer to the main dimension parameters actually adopted in the end, reducing the number of manual iterative modifications during the design process, improving design efficiency while meeting design safety requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of the process of the rapid design model of the main scale of the floating wind turbine foundation with different capacities according to the embodiment of the present invention.

[0042] Figure 2 This is a schematic diagram of a semi-submersible floating wind turbine according to an embodiment of the present invention.

[0043] Figure 3 This is a schematic diagram of the floating wind turbine base according to an embodiment of the present invention. DETAILED DESCRIPTION

[0044] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart under the guidance of the content of the present application, or remove one or more operations from the flowchart.

[0045] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0046] In order to enable those skilled in the art to use the content of this application, the following implementation is provided in combination with a specific application scenario, the field of semi-submersible floating wind turbines. For those skilled in the art, the general principles defined herein can be applied to other embodiments and application scenarios without departing from the spirit and scope of this application.

[0047] Although the present application is mainly described around the field of semi-submersible floating wind turbines, it should be understood that this is only an exemplary embodiment.

[0048] It should be noted that the term "including" will be used in the embodiments of the present application to indicate the existence of the features declared thereafter, but does not exclude the addition of other features. Before implementing the solution provided in the embodiments of the present application, it is necessary to establish a small-capacity semi-submersible floating wind turbine model. This embodiment uses a 2MW floating wind turbine foundation, and its related parameters are known. According to the solution proposed in the present application, its floating foundation is enlarged to be suitable for 10MW wind turbines and 15MW wind turbines. The specific method flow is as follows:

[0049] Step 1: Obtain relevant parameters of the 2MW floating wind turbine impeller, which are provided by the wind turbine manufacturer, including the impeller thrust F 0 , impeller mass M t0 ; Obtain relevant parameters of 10MW and 15MW wind turbine impellers, including impeller thrust F 1 、F 2 , impeller mass M t1 、M t2

[0050] Step 2: Obtain the relevant parameters of the 2MW floating wind turbine foundation, which are provided by the foundation design unit, including the draft D d0 , Displacement V 0 , Type length L x0 、Width L y0 、Deep L z0 , Dimensions of each component of the floating foundation Define the relevant parameters of the 10MW floating wind turbine foundation, including the draft D d1 , Displacement V 1 , Type length L x1 、Width L y1 、Deep L z1 , Dimensions of each component of the floating foundation Define the relevant parameters of the 15MW floating wind turbine foundation, including the draft D d2 , Displacement V 2 , Type length L x2 、Width L y2 、Deep L z2 , Dimensions of each component of the floating foundation

[0051] The displacement is related to the draft and the size of each component of the floating foundation, and is the sum of the displacement volumes of each component, that is:

[0052]

[0053] in,

[0054] V 0 The displacement of the 2MW floating wind turbine foundation.

[0055] V 1 The displacement of the 10MW floating wind turbine foundation.

[0056] V 2 The displacement of the 15MW floating wind turbine foundation;

[0057] Step 3: Define the relationship between the impeller mass, the displacement of the floating body, and the floating body scale similarity ratio. Specifically, the impeller mass ratio of the 2MW wind turbine and the 10MW wind turbine is the same as the floating body displacement ratio, and is the cube of the basic scale similarity ratio of the floating body. The scale similarity ratio of the 2MW and 10MW floating bodies is defined as s 1 , the similarity ratio formula can be expressed as:

[0058]

[0059]

[0060] The scale similarity ratio between 2MW and 15MW floating bodies is defined as s 2 , the similarity ratio formula can be expressed as:

[0061]

[0062]

[0063] Step 4: The preliminary size parameters of the 10MW floating wind turbine foundation can be obtained through the scale similarity ratio s 1 Calculation shows that the main dimensions of the 10MW floating foundation and the dimensions of each component are as follows:

[0064] L′ x1 =s 1 ×L x0 L′ y1 =s 1 ×L y0 L′ z1 =s 1 ×L z0

[0065] x′ 1 =s 1 × 0 y′ 1 =s 1 ×y 0 z′ 1 =s 1 × 0

[0066] in:

[0067] L′ x1 This is the preliminary length of the 10MW wind turbine floating foundation.

[0068] L′ y1 This is the preliminary width of the 10MW wind turbine floating foundation.

[0069] L′ z1 The initial depth of the 10MW wind turbine floating foundation.

[0070] L x0 It is a 2MW wind turbine floating foundation type.

[0071] L y0 The width of the floating foundation of a 2MW wind turbine.

[0072] L z0 The floating foundation of a 2MW wind turbine is deep.

[0073] s 1 The scale of the 2MW and 10MW floating bodies is similar.

[0074] x′ 1 is the preliminary length of each component of the 10MW wind turbine floating foundation in the x direction,

[0075] y′ 1 The preliminary width and preliminary length in the y direction of the 10MW wind turbine floating foundation.

[0076] z′ 1 The preliminary width and preliminary length in the z direction of the 10MW wind turbine floating foundation;

[0077] The calculation method of the main dimensions of the 15MW floating foundation and the dimensions of each component is the same, as follows:

[0078] The preliminary size parameters of the 15MW floating wind turbine foundation can be obtained by using the scale similarity ratio s 1 Calculation shows that the main dimensions of the 15MW floating foundation and the dimensions of each component are as follows:

[0079] L′x 2 =s 2 ×L x0 L′ y2 =s 2 ×L y0 L′ z2 =s 2 ×L z0

[0080] x′ 2 =s 2 × 0 y′ 2 =s 2 ×y 0 z′ 2 =s2 × 0

[0081] in:

[0082] L′ x2 This is the preliminary length of the 15MW wind turbine floating foundation.

[0083] L′ y2 This is the preliminary width of the 15MW wind turbine floating foundation.

[0084] L′ z2 The initial depth of the 15MW wind turbine floating foundation.

[0085] L x0 It is a 2MW wind turbine floating foundation type.

[0086] L y0 The width of the floating foundation of a 2MW wind turbine.

[0087] L z0 The floating foundation of a 2MW wind turbine is deep.

[0088] s 2 The scale of the 2MW and 15MW floating bodies is similar.

[0089] x′ 2 is the preliminary length of each component of the 15MW wind turbine floating foundation in the x direction,

[0090] y′ 2 The preliminary width and preliminary length in the y direction of the 15MW wind turbine floating foundation.

[0091] z′ 2 The preliminary width and preliminary length in the z direction of the 15MW wind turbine floating foundation;

[0092] Step 5: Calculate the maximum pitch angle q, keeping the maximum pitch angles of the 2MW wind turbine, 10MW wind turbine, and 15MW wind turbine consistent on calm water. The public expression is:

[0093]

[0094] in, is the hydrostatic restoring moment of the pitch of a 2MW wind turbine float. The pitching hydrostatic restoring moments of the 10MW and 15MW wind turbine floats are calculated as follows:

[0095] C 55 =ρ water gV(Z B -Z G )+ρ water I yy

[0096] where ρ water is the density of seawater, g is the acceleration of gravity, V is the displacement of the floating body, Z B is the buoyancy center height of the floating wind turbine, Z G is the center height of the floating wind turbine, I yy is the waterline area moment of inertia relative to the y-axis of the floating body coordinate system, and the calculation formula is:

[0097]

[0098] Among them, A i is the waterline area of ​​each component of the floating foundation. For components below the waterline, A i =0;L i is the distance from the center of each component to the longitudinal section of the floating foundation; is the waterplane area moment of inertia of each component relative to the y-axis of its own coordinate system;

[0099] Step 6: Carry out multi-parameter optimization design of the steel consumption of the 10MW and 15MW floating wind turbine buoy foundations. The goal is to minimize the steel consumption f(m) of the floating foundation structure. The decision variables are the dimensions of the components of the 10MW and 15MW floating foundations. and The constraints are:

[0100] (1) The maximum pitch angle q of the 10MW and 15MW floating wind turbines remains unchanged, which satisfies step 5;

[0101] (2) Based on the construction site restrictions, the size of the 10MW and 15MW wind turbine floats does not exceed the site and equipment restrictions;

[0102] (3) 10MW and 15MW floating wind turbine heave (T z )、Roll(T rx ) and pitch (T ry ) The natural period of motion is not within the range of the main wave energy period (6-15s);

[0103] (4) To ensure good structural load transfer and avoid stress concentration, keep the diameter of the middle column UC0 consistent with the diameter of the wind turbine tower;

[0104] In the optimization process, the 10MW floating wind turbine size x′ obtained in step 4 is used 1 , y′ 1 , z′ 1 and 15MW floating wind turbine size x′ 2 , y′ 2 , z′ 2 are the initial values ​​respectively.

[0105] The target is defined as the minimum amount of steel used in the floating structure, which can be expressed as:

[0106] min f(m),

[0107] Where f(m)=∑m(x i 1 ,y i 1 ,z i 1 ), is the cumulative steel consumption of each part.

[0108] Taking a 10MW floating wind turbine as an example, the constraint function can be expressed as:

[0109]

[0110] Among them, L xlim , L ylim , L zlim The maximum length, width and depth of the floating foundation limited by the equipment; is the natural period of heave, pitch and roll of a 10MW floating wind turbine; [T 1 , T 2 ] is the main energy range period of the wave, and its value is [6, 15]; D md is the diameter of the middle column UC0 of the floating body;

[0111] The natural period of motion is calculated as:

[0112]

[0113] Where M is the weight of the floating wind turbine including ballast, m a is the additional mass of the floating body foundation under the corresponding degree of freedom, C is the motion stiffness of the floating body foundation under the corresponding degree of freedom;

[0114] Based on the optimization calculation, the size x of each component of the large-capacity floating foundation can be obtained 1 ,y 1 、z 1 ;

[0115] The same calculation method is used for the foundation size of the 15MW floating wind turbine.

[0116] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. The main scale rapid design model of floating wind turbine foundation with different capacities is characterized by: include: Step 1, obtaining relevant parameters of a small-capacity floating fan impeller; Step 2, obtaining relevant parameters of the floating foundation of a small-capacity floating wind turbine; Step 3, calculating the relationship between the impeller mass and the displacement of the floating body and the similarity ratio of the floating body size; Step 4, calculating preliminary size parameters of the floating foundation of the large-capacity floating wind turbine using the similarity ratio obtained in step 3; Step 5, calculating the maximum pitch and static inclination angle under the condition that the maximum pitch and static inclination angles of the small-capacity fan and the large-capacity fan on a calm water surface are kept consistent; Step 6, taking the size of each component of the floating foundation as the decision variable, and calculating the steel quantity parameters of the floating wind turbine floating foundation under the condition that the steel quantity of the floating foundation structure is the minimum; In step 6, the size of each component of the floating foundation is used as the decision variable. When the amount of the floating foundation structure is the minimum, the method for calculating the steel amount parameters of the floating wind turbine floating foundation is as follows: The large-capacity floating wind turbine dimensions x, y, and z obtained in step 4 are used as initial values, and the objective function is min f(m). Where f(m)=∑m(x i 1,y i 1,z i 1) is the cumulative steel consumption of each part, The constraint function is: Among them, L xlim , L ylim , L zlim The maximum length, width and depth of the floating foundation limited by the equipment; is the natural period of heave, pitch and roll of large-capacity wind turbines; [T1, T2] is the period of the main energy range of waves; D md is the diameter of the circular buoy under the wind turbine tower; The natural period of motion is: Where M is the weight of the floating wind turbine including ballast, m a is the additional mass of the floating foundation under the corresponding degree of freedom, C is the motion stiffness of the floating foundation under the corresponding degree of freedom; the dimensions x1, y1, z1 of each component of the large-capacity floating foundation are obtained.

2. The main scale rapid design model of floating foundations of floating wind turbines with different capacities according to claim 1 is characterized by: The relevant parameters of the small-capacity floating wind turbine impeller in step 1 include impeller thrust F0, impeller mass M t0 ; Obtain relevant parameters of large-capacity floating wind turbine impellers, including impeller thrust F1, impeller mass M t1 .

3. The main scale rapid design model of floating foundations of floating wind turbines with different capacities according to claim 2 is characterized by: The relevant parameters of the small-capacity floating wind turbine buoy foundation in step 2 include draft D d0 , displacement V0, length L x0 、Width L y0 、Deep L z0 , Dimensions of each component of the floating foundation Define the relevant parameters of the floating foundation of large-capacity floating wind turbines, including the draft D d1 , displacement V1, length L x1 、Width L y1 、Deep L z1 , Dimensions of each component of the floating foundation 4. The main scale rapid design model of floating foundations of floating wind turbines with different capacities according to claim 3 is characterized by: In step 3, the relationship between the impeller mass, the displacement of the floating body, and the floating body scale similarity ratio is:

5. The main scale rapid design model of floating foundations of floating wind turbines with different capacities according to claim 4 is characterized in that: The method of calculating the preliminary size parameters of the floating body foundation of the large-capacity floating wind turbine by the similarity ratio obtained in step 3 in step 4 includes: L' x1 =s×L x0 L' y1 =s×L y0 L' z1 =s×L z0 x′1=s×x0 y′1=s×y0 z′1=s×z0 Among them, L′ x1 is the preliminary length of the large-capacity wind turbine floating foundation, L′ y1 is the preliminary width of the large-capacity wind turbine floating foundation, L′ z1 The preliminary depth of the large-capacity wind turbine floating foundation, L x0 is the length of the floating foundation of the small-capacity wind turbine, L y0 is the width of the floating foundation of the small-capacity wind turbine, L z0 The floating foundation depth of the small-capacity wind turbine.

6. The main scale rapid design model of floating foundations of floating wind turbines with different capacities according to claim 5 is characterized in that: The step 5 calculates the maximum pitch and static inclination angle q while keeping the maximum pitch and static inclination angles of the small-capacity fan and the large-capacity fan consistent on a calm water surface: in, is the pitch hydrostatic restoring moment of the small-capacity wind turbine float. It is the pitch hydrostatic restoring moment of the large-capacity wind turbine float. Pitch restoring moment in still water C 55 =ρ water gV(Z B -Z G )+ρ water I yy Among them, ρ water is the density of seawater, g is the acceleration of gravity, V is the displacement of the floating body, Z B is the buoyancy center height of the floating wind turbine, Z G is the center height of the floating wind turbine, I yy is the waterline area moment of inertia relative to the y-axis of the floating body coordinate system, and the calculation formula is: Among them A i is the waterline area of ​​each component of the floating foundation. For components below the waterline, A i =0;L i is the distance from the center of each component to the longitudinal section of the floating foundation; It is the moment of inertia of the waterline area of ​​each component relative to the y-axis of its own coordinate system.

Images