An integrated design method for offshore wind power and related components

Abstract

The present invention discloses an integrated design method and related components for offshore wind power, which relates to the field of offshore wind power construction. An integrated model of offshore wind power is constructed based on the sub-models of various components of offshore wind power. An environmental load is applied to the integrated model for a preset duration, and its instantaneous load at each moment is determined. The maximum instantaneous load is taken as the ultimate load of the integrated model. The ultimate load is applied to N specified sub-models respectively, and it is judged whether the stress and strain of the N sub-models exceed their limit values under the ultimate load. If none of the N sub-models exceed, it is determined that the design of the offshore wind power is qualified; if there is a sub-model that exceeds, it is determined that the design of the offshore wind power is unqualified. By building an integrated model and determining its ultimate load, repeated calculation of the same kind of load can be avoided; by taking the instantaneous load as the ultimate load, the design of the offshore wind power can be made more in line with the actual situation, avoiding conservative design and reducing the project cost.

Description

Technical Field

[0001] The present invention relates to the field of offshore wind power construction, and particularly to an integrated design method for offshore wind power and related components. Background Art

[0002] Offshore wind power mainly consists of two types of structures: wind turbines and offshore support structures. Since offshore wind power needs to work in the marine environment for a long time, it has relatively high requirements for the structural stability and safety of wind turbines and offshore support structures, and requires wind turbines and offshore support structures to ensure structural stability in various load environments. In the prior art, when designing wind turbines and offshore support structures, the maximum values of various loads such as wind loads, wave loads, and current loads received by wind turbines and offshore support structures are usually superimposed on each other as their ultimate conditions, and the wind turbines and offshore support structures are designed based on the ultimate conditions. However, because in the actual situation, it is impossible for all loads to reach their maximum values at the same time, the design output obtained by the design method of superimposing the maximum values of various loads is relatively conservative, and requires a relatively high project cost.

[0003] Moreover, currently, wind turbines and offshore support structures are usually designed and manufactured by different design institutes or manufacturers respectively. Due to problems such as untimely communication and information asynchronization, there may be a problem of repeated calculation of the same type of load, further increasing the project cost and installation cost. Summary of the Invention

[0004] The purpose of the present invention is to provide an integrated design method for offshore wind power and related components, which can avoid repeated calculation of the same type of load, make the design of offshore wind power more in line with the actual situation, avoid conservative design, and reduce the project cost.

[0005] To solve the above technical problems, the present invention provides an integrated design method for offshore wind power, including:

[0006] Construct an integrated model of offshore wind power according to the sub-model of the offshore support structure and the sub-models corresponding to each component of the wind turbine;

[0007] Apply environmental loads with a preset duration to the integrated model, and determine the instantaneous loads at each moment within the preset duration of the integrated model;

[0008] Among the instantaneous loads, take the instantaneous load with the largest load as the ultimate load of the integrated model;

[0009] Apply the ultimate load to N specified sub-models respectively, and judge whether the stress of the N sub-models under the ultimate load is greater than a first preset limit value and whether the strain is greater than a second preset limit value, where N is a positive integer not greater than the total number of sub-models;

[0010] If all of the N sub-models determine it to be "yes", it is determined that the design of the offshore wind power is qualified;

[0011] If there is a sub-model that determines it to be "no", it is determined that the design of the offshore wind power is unqualified.

[0012] Preferably, after constructing the integrated model of the offshore wind power, it further includes:

[0013] Converting the integrated model into a finite element model;

[0014] Setting a stiffness matrix representing the simulated seabed environment at the bottom in the finite element model;

[0015] Applying an environmental load with a preset duration to the integrated model, including:

[0016] Applying the environmental load with the preset duration to the finite element model with the stiffness matrix.

[0017] Preferably, before applying the environmental load with a preset duration to the integrated model, it further includes:

[0018] Determining m structural parameters of the integrated model, where m is a positive integer;

[0019] After taking the instantaneous load with the maximum load as the ultimate load of the integrated model, it further includes:

[0020] Determining the stress and strain of the integrated model according to the ultimate load;

[0021] Judging whether the integrated model meets the preset design requirements according to the m structural parameters, the stress and strain of the integrated model;

[0022] If so, enter the step of applying the ultimate load to each of the specified N sub-models respectively;

[0023] If not, use the preset particle swarm optimization algorithm to transform the numerical values of the m structural parameters, and return to the step of constructing the integrated model of the offshore wind power using the new structural parameters.

[0024] Preferably, after using the preset particle swarm optimization algorithm to transform the numerical values of the m structural parameters, it further includes:

[0025] Incrementing the total iteration count of the offshore wind power by 1;

[0026] Judging whether the total iteration count is greater than the preset iteration count;

[0027] If so, execute the preset anti-typhoon control strategy corresponding to the offshore wind power.

[0028] Preferably, before the step of returning to apply the environmental load to the integrated model for a preset duration, the method further includes:

[0029] When the preset anti-typhoon control strategy is to rotate the wind turbine rotor and blades to the downwind direction, update the sub-model of the wind turbine according to the preset anti-typhoon control strategy, and update the integrated model according to the sub-model of the wind turbine.

[0030] Preferably, after determining that the offshore wind power design is unqualified, the method further includes:

[0031] Use a preset particle swarm algorithm to change x structural parameters in the sub-model determined to be greater than, where x is a positive integer, to obtain a new sub-model;

[0032] Update the integrated model according to the new sub-model, and return to the step of constructing the integrated model of the offshore wind power.

[0033] Preferably, determining the ultimate load of the integrated model within the preset duration includes:

[0034] Determine the overall machine response spectrum of the integrated model in terms of structural dynamics within the preset duration;

[0035] Take the maximum value in the overall machine response spectrum as the ultimate condition of the integrated model;

[0036] Multiply the ultimate condition by a preset safety factor to obtain the ultimate load of the integrated model within the preset duration;

[0037] Wherein, the overall machine response spectrum is composed of the loads between the connection surfaces of each sub-model.

[0038] Preferably, applying the ultimate load to N specified sub-models respectively includes:

[0039] Extract the sub-response spectra corresponding to the N sub-models from the overall machine response spectrum;

[0040] Take the maximum value in the sub-response spectrum as the ultimate load and apply it to the corresponding sub-model.

[0041] This application also provides an integrated design device for offshore wind power, including:

[0042] A memory for storing a computer program;

[0043] A processor for implementing the steps of the integrated design method for offshore wind power as described above when executing the computer program.

[0044] The present application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the integrated design method for offshore wind power as described above are implemented.

[0045] The present application provides an integrated design method for offshore wind power and related components, which relates to the field of offshore wind power construction. An integrated model of offshore wind power is constructed based on sub-models of various components of offshore wind power. An environmental load is applied to the integrated model for a preset duration, and its instantaneous load at each moment is determined. The maximum instantaneous load is used as the ultimate load of the integrated model. The ultimate load is applied to each of the N sub-models, and it is judged whether the stress and strain of the N sub-models exceed their limit values under the ultimate load. If none of the N sub-models exceed, it is determined that the design of the offshore wind power is qualified; if there is a sub-model that exceeds, it is determined that the design of the offshore wind power is unqualified. By constructing an integrated model and determining its ultimate load, repeated calculation of the same kind of load can be avoided; by using the instantaneous load as the ultimate load, the design of the offshore wind power can be made more in line with the actual situation, conservative design can be avoided, and the project cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the prior art and the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0047] Figure 1 It is a flowchart of an integrated design method for offshore wind power provided by the present application;

[0048] Figure 2 It is a flowchart of a method for calculating the ultimate load in the prior art;

[0049] Figure 3 It is a schematic structural diagram of a sub-model of an offshore foundation in the prior art;

[0050] Figure 4 It is a schematic structural diagram of an integrated model of offshore wind power provided by the present application;

[0051] Figure 5 It is a comparison diagram of the bending moments of the main cross-sections of the offshore foundation and the seabed mud surface between the present application and the prior art;

[0052] Figure 6 It is a comparison diagram of the shear forces of the main cross-sections of the offshore foundation and the seabed mud surface between the present application and the prior art;

[0053] Figure 7Horizontal displacement comparison diagram of the main cross-section of the offshore foundation and the seabed mud surface between this application and the prior art;

[0054] Figure 8 Corner comparison diagram of the main cross-section of the offshore foundation and the seabed mud surface between this application and the prior art;

[0055] Figure 9 Vertical deformation comparison diagram of the main cross-section of the offshore foundation and the seabed mud surface between this application and the prior art;

[0056] Figure 10 Schematic diagram of the corresponding relationship between load and safety factor of the prior art;

[0057] Figure 11 Schematic diagram of the corresponding relationship between an extreme working condition and a safety factor provided by this application;

[0058] Figure 12 Flow chart of another integrated design method for offshore wind power provided by this application;

[0059] Figure 13 Schematic diagram of the structure of another integrated design device for offshore wind power provided by this application. Specific implementation manners

[0060] The core of the present invention is to provide an integrated design method for offshore wind power and related components, which can avoid repeated calculation of the same kind of load, make the design of offshore wind power more in line with the actual situation, avoid conservative design, and reduce the project cost.

[0061] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0062] Since at least 60GW of offshore wind power generation capacity is planned annually in China currently, and since offshore wind power officially exits the national subsidy and the subsidies of each province are also decreasing year by year, each wind power main engine factory and design institute focus on cost reduction and efficiency improvement in the design of offshore wind power to improve the market competitiveness of products.

[0063] In the cost composition of offshore wind power, the cost of wind turbines (usually including four parts: wind rotor, main engine nacelle, tower barrel, and tower bottom components) accounts for about 30% of the total cost, the cost of offshore support structures accounts for about 30% of the total cost, the cost of offshore power facilities accounts for about 20% of the total cost, and the installation cost of the entire offshore wind power accounts for about 20% of the total cost. Since wind turbines and offshore support structures account for the highest proportion of the total cost and have the largest adjustable space, these two are the key breakthrough points for cost reduction. In addition, the offshore support structure refers to a structure that ensures the fixation and stability of wind turbines and is usually also called an offshore foundation or foundation. For simplicity of description, this application uses the term "offshore foundation" to represent the offshore support structure.

[0064] Since offshore wind power needs to work in a windy offshore environment all year round, it is necessary to ensure high stability and durability of offshore wind power. The existing technology usually adopts a split design method. When designing offshore wind power, all extreme working conditions are usually taken into account, and offshore wind power is designed based on the most extreme situation. That is to say, each load that the offshore wind turbine receives in the actual application scenario is set as the theoretical maximum value that may be encountered. For example, the wind load, wave load, and water flow load are all set as the maximum values, and all the maximum values are added together as the extreme working condition of offshore wind power. Offshore wind power is designed based on this most extreme situation to ensure the stability and durability of offshore wind power. Please refer to Figure 2 and Figure 3 , Figure 2 is a flowchart of an existing technology's extreme load calculation method, Figure 3 is a structural schematic diagram of an existing technology's offshore foundation sub-model. In the existing technology, after establishing each sub-model, environmental loads are applied, the maximum values of various loads are extracted, and the superposition of multiplying each maximum value by the load correlation coefficient using the methods of static equilibrium and deformation coordination is used as the load under extreme working conditions; when applying loads to the offshore foundation (i.e., Figure 2 the monopile foundation described in Figure 3 ), the maximum wind turbine load is applied to the top, that is, the force generated by the upper part of the offshore foundation (wind rotor, nacelle, tower barrel, and components, etc.) on the top of the offshore foundation under the action of loads such as wind load, wave load, and self-weight load. For example, xy F z = 2915 kN, F xy = -12308 kN, M z= -28785 kNm, because the maximum values of these loads are taken respectively, and the ultimate load under the ultimate condition of the offshore foundation model is the superposition of each maximum value multiplied by the load correlation coefficient. Although this method can also ensure the stability and durability of the offshore wind power throughout the year, since it is impossible to have an extreme situation where each load is at its maximum in the actual application scenario, this method is relatively conservative and cannot effectively reduce the construction cost of the offshore wind power.

[0065] To solve the above technical problems, please refer to Figure 1 , Figure 1 FIG. is a flowchart of an integrated design method for an offshore wind power provided by this application. The integrated design method includes:

[0066] S1: Construct an integrated model of the offshore wind power according to the sub-model of the offshore support structure and the sub-models corresponding to each component of the wind turbine.

[0067] Considering that in the prior art, different sub-models are usually responsible by different manufacturers or design institutes. For example, the tower sub-model in the wind turbine is responsible by the main factory of the wind turbine, and the offshore foundation sub-model is responsible by the design institute. Since the design of the offshore wind power involves multiple manufacturers, there are usually situations of untimely communication and information asynchronization. In the actual application scenario, in order to avoid such situations, manufacturers and design institutes usually design the sub-models based on the various loads that their respective responsible sub-models will receive. Then, in subsequent calculations, there may be a situation where a certain load is introduced or calculated repeatedly, resulting in the design of the offshore wind power being further conservative and unable to effectively reduce the construction cost of the offshore wind power.

[0068] To solve the above technical problems, in this application, after obtaining various sub-models of the offshore foundation and the wind turbine through software, first use the software to piece together these sub-models into an integrated three-dimensional model. For the wind turbine, the wind turbine usually includes at least four sub-models: the wind wheel, the nacelle, the tower, and the tower bottom component. The wind wheel model includes multiple blades and a hub; the nacelle model is bounded by the nacelle cover, ignoring the internal details, and endowing with mass attributes, and its head is connected to the hub of the wind wheel model; the tower model is a slender cylindrical shape with a certain angle of taper, the top of the model is connected to the bottom of the nacelle model, and its bottom end is connected to the offshore foundation model; the shape of the tower bottom component model is indefinite and is connected to the tower model; the offshore foundation is frustum-shaped and can be single-pile type or jacket type, and the bottom surface of the offshore foundation is inserted deep into the seabed soil. Please refer to Figure 4 , Figure 4Schematic diagram of the structure of an integrated model for offshore wind power provided by this application. The entire integrated model includes a wind turbine sub-model 1, a nacelle sub-model 2, a tower sub-model 3, a tower bottom component sub-model 4, and an offshore support structure sub-model 5. After piecing together each sub-model into a whole and then applying loads to the integrated model, the situation of repeatedly introducing a certain load can be avoided, so as to reduce the cost of offshore wind power.

[0069] S2: Apply environmental loads to the integrated model for a preset duration, and determine the instantaneous loads of the integrated model at each moment within the preset duration;

[0070] S3: Among all the instantaneous loads, take the instantaneous load with the maximum load as the ultimate load of the integrated model;

[0071] The environmental loads refer to the wind loads, wave loads, current loads, self-weight loads, etc. that the offshore wind power is subjected to. In the prior art, for these unsteady loads such as wind loads and wave loads, the maximum values within a certain period of time are taken respectively, and the ultimate working load of the offshore wind power is taken as the superimposed value of the maximum values of each load. In this application, these unsteady loads take the values at the same time, and the ultimate load of the offshore wind power is the maximum overall load that the offshore wind power is subjected to at a certain time point within a certain period of time. For example, apply environmental loads for 1 minute. Assume that the wind load is the largest at the 10th second, the wave load is the largest at the 45th second, and the current load is the largest at the 20th second. The prior art takes the wind load at the 10th second, the wave load at the 45th second, and the current load at the 20th second for superposition to obtain the ultimate load of the offshore wind power; further assume that the sum of the wind load, wave load, and current load of the offshore wind power is equal to the overall load. The overall load is the largest at the 10th second, medium at the 45th second, and the smallest at the 20th second. This application takes the overall load at the 10th second as the ultimate load of the offshore wind power. It can be seen that the level of the ultimate load obtained in this application is lower and closer to the actual situation.

[0072] When collecting loads, a random load spectrum within a certain time interval can be obtained according to actual surveys. For example, according to the actual wind farm survey, the load spectrum within a certain period of time is shown in Table 1:

[0073] Table 1: Main parameters of wind loads

[0074]

[0075] Similarly, according to the wind farm survey, assuming the water depth is 17.0 m, a periodic wave load spectrum within a certain time interval can be obtained using the following hydrological parameters:

[0076] Table 2: Main parameters of wave loads

[0077]

[0078] For the water flow load, considering that offshore wind power is usually applied in offshore waters and the wind farm is also located in offshore waters, the water flow load is usually set as a steady load, and the specific value of the water flow load can be calculated according to the parameters in Table 2 above.

[0079] S4: Apply the limit load to the specified N sub-models respectively, and judge whether the stress of the N sub-models under the limit load is greater than the first preset limit value and whether the strain is greater than the second preset limit value, where N is a positive integer not greater than the total number of sub-models;

[0080] S5: If all N sub-models are judged to be yes, it is determined that the design of the offshore wind power is qualified;

[0081] S6: If there is a sub-model judged to be no, it is determined that the design of the offshore wind power is unqualified.

[0082] After applying the environmental load to the integrated model, the overall design of the offshore wind power can usually be initially judged according to the limit load of the integrated model. In order to further ensure the reliability and safety of the offshore wind power, each sub-model needs to be detected, and its detection process is roughly the same as the overall judgment of the offshore wind power. Specifically, after obtaining the limit load of the overall offshore wind power, apply this limit load to each sub-model respectively, and then calculate the limit conditions and fatigue conditions of the sub-model, calculate the stress and strain of the sub-model when it is subjected to the limit load. If it is found that the stress or strain of a certain sub-model is too large, it means that the design of this sub-model is unqualified, and further means that the design of the entire offshore wind power is unqualified, and the design of this sub-model needs to be redone. Only when all sub-models are qualified can it be determined that the design of the offshore wind power is qualified, avoiding the problem of low stability of the offshore wind power caused by excessive pursuit of low cost.

[0083] Compared with the prior art, since the various loads applied to the offshore wind power in this application are all applied at the same moment, while the prior art applies the maximum values of various loads at different moments, the loads and forces of the offshore wind power in this application are smaller than those of the prior art, and it is more in line with the actual situation. Please refer to Figure 5 、 6 、7、8 and 9, Figure 5 which is the bending moment comparison diagram of the main sections of the offshore foundation and the seabed mud surface between this application and the prior art, Figure 6 which is the shear force comparison diagram of the main sections of the offshore foundation and the seabed mud surface between this application and the prior art, Figure 7 which is the horizontal displacement comparison diagram of the main sections of the offshore foundation and the seabed mud surface between this application and the prior art, Figure 8 which is the rotation angle comparison diagram of the main sections of the offshore foundation and the seabed mud surface between this application and the prior art, Figure 9This is a vertical deformation comparison diagram of the main cross-section of the offshore foundation and the seabed mud surface between this application and the prior art. In the figure, "separated type" refers to the separated design used in the prior art, and "integrated type" refers to the integrated design used in this application. It can be seen that the bending moment obtained in this application is about M xy is 585411 kNm, which is about 26.2% smaller than 793122 kNm obtained in the prior art; the shear force F xy obtained in this application is 12218 kN, which is about 19.1% smaller than 15102 kN obtained in the prior art; the horizontal displacement of 9.53 cm obtained in this application is 27.2% smaller than 13.09 cm obtained in the prior art; the rotation angle of 3.24‰ rad obtained in this application is 25.3% smaller than 4.34‰ rad obtained in the prior art; the vertical deformation of the foundation of 0.16 cm obtained in this application is 56.8% smaller than 0.37 cm obtained in the prior art. Based on this, since the loads applied to the offshore wind power in this application are more in line with the actual situation and the actual loads are smaller than those in the prior art, the actual stresses, strains, etc. received by each sub-model of the offshore wind power are also smaller. Therefore, the extreme situations that need to be considered in the design and manufacture of the offshore wind power are smaller, which optimizes the overall weight of the offshore wind power, reduces the overall project volume, and reduces the project cost.

[0084] In summary, an integrated model of the offshore wind power is constructed according to the sub-models of various components of the offshore wind power. An environmental load is applied to the integrated model for a preset duration, and the instantaneous load at each moment within the preset duration is determined. The maximum instantaneous load is used as the ultimate load of the integrated model. The ultimate load is applied to N sub-models respectively, and it is judged whether the stress of the N sub-models under the ultimate load is greater than the first preset limit value and whether the strain is greater than the second preset limit value. If all N sub-models are determined to be not greater, it is determined that the design of the offshore wind power is qualified; if there is a determination of being greater, it is determined that the design of the offshore wind power is unqualified; the environmental load therein is the actual load within a period of time collected in advance. By establishing an integrated model of the offshore wind power and determining its ultimate load, the situation of repeated calculation of the same kind of load can be avoided; and by using the instantaneous load as the ultimate load, the design of the offshore wind power can be made more in line with the actual situation, avoiding conservative design and reducing the project cost.

[0085] Based on the above embodiments:

[0086] As a preferred embodiment, after constructing the integrated model of the offshore wind power, it further includes:

[0087] Converting the integrated model into a finite element model;

[0088] Setting a stiffness matrix representing the simulated seabed environment at the bottom of the finite element model;

[0089] Apply an environmental load to the integrated model for a preset duration, including:

[0090] Apply an environmental load to the finite element model with a stiffness matrix for a preset duration.

[0091] To facilitate the subsequent determination of the ultimate load, in this application, it is necessary to convert the integrated model into a finite element model. Specifically, the connection surfaces between each sub-model are all connected by bonding. For example, the top of the tower sub-model is connected to the bottom of the nacelle sub-model, and the bottom of the tower sub-model is connected to the top of the offshore foundation sub-model. And a mud surface stiffness matrix is set at the bottom of the offshore foundation sub-model to simulate the seabed soil environment, so as to simulate the real load. Based on this, when applying the environmental load to the finite element model subsequently, determine the load information at each connection surface, that is, the load on the contact surface of each sub-model, and add these loads to obtain the load value of the finite element model at each moment. Based on this, by converting the integrated model into a finite element model, it is convenient to determine the ultimate load.

[0092] As a preferred embodiment, before applying the environmental load to the integrated model for a preset duration, it further includes:

[0093] Determine m structural parameters of the integrated model, where m is a positive integer;

[0094] After taking the instantaneous load with the maximum load as the ultimate load of the integrated model, it further includes:

[0095] Judge whether the integrated model meets the preset design requirements according to the m structural parameters and the ultimate load;

[0096] If so, enter the step of applying the ultimate load to each of the specified N sub-models respectively;

[0097] If not, use the preset particle swarm optimization algorithm to transform the numerical values of the m structural parameters, and return to the step of constructing the integrated model of the offshore wind power using the new structural parameters.

[0098] To preliminarily judge whether the offshore wind power meets the design requirements, in this application, considering that there are many sub-models of the offshore wind power and it takes a long time to check whether each of these sub-models is qualified one by one, so the overall qualification of the integrated model can be judged first. If it is qualified, then judge the sub-models. If it is unqualified, do not perform the subsequent steps to improve efficiency. Specifically, please refer to Figure 12 , Figure 12 For the flowchart of another integrated design method of the offshore wind power in this application, before applying the environmental load to the integrated model, some structural parameters in the integrated model can be determined first (the structural parameters are also Figure 12The local optimization parameters therein can be parameters such as the power rating of the wind turbine, the rotor diameter, the hub center height, the outer blade aspect ratio distribution, the middle blade twist angle distribution, the tower inner diameter, and the tower wall thickness). Then, after determining the ultimate load of the integrated model, it is determined whether the integrated model meets the preset design requirements according to the previously determined structural parameters and the ultimate load (the preset design requirements are also Figure 12 The global optimization variables in, which can be requirements such as the optimal power curve, power generation, the weight of the entire offshore wind turbine, or the overall cost). Whether the ultimate load meets the preset design requirements actually depends on whether the overall stress and strain of the integrated model exceed the previous limit values. If the stress and strain are low but the structural parameters do not meet the actual requirements, or the structural parameters meet the actual requirements but the stress or strain is too high, it is determined that the integrated model does not meet the design requirements. Therefore, it is necessary to continuously change the structural parameters to find a design method with low stress and strain and structural parameters that meet the requirements.

[0099] For example, assuming that the power generation of the offshore wind turbine is used as the actual requirement, then on the premise of ensuring low stress and strain, it is also necessary to ensure that the power generation is high enough; taking the three parameters of the rotor diameter, the hub center height, and the tower top inner diameter as the structural parameters, when it is determined through calculation that the power generation of the offshore wind turbine is lower than the required threshold, one or more of the rotor diameter, the hub center height, and the tower top inner diameter need to be changed. Specifically, it is changed in the direction of increasing power generation. For example, when changing the rotor diameter, the diameter needs to be increased, and when changing the hub center height, the height needs to be increased, etc. The actual changed value can be randomly selected within a certain range. Since the structural parameters have changed, it is necessary to update the integrated model and start a new round of calculations. Based on this, by continuously updating the integrated model for iteration until the offshore wind turbine meets the preset design requirements, it can be preliminarily judged whether the overall offshore wind turbine meets the design requirements, improving the design efficiency.

[0100] As a preferred embodiment, after using the preset particle swarm algorithm to transform the numerical values of m structural parameters, it further includes:

[0101] Increment the iteration count of the entire offshore wind turbine by 1;

[0102] Judge whether the iteration count of the entire machine is greater than the preset iteration count;

[0103] If so, execute the preset anti-typhoon control strategy corresponding to the offshore wind turbine.

[0104] To better conform to the actual situation, in this application, considering that offshore wind power operates in the sea surface environment and may encounter typhoons in actual operation, in order to ensure the stability of offshore wind power during typhoon weather, when applying environmental loads to the integrated model, the environmental loads during typhoon weather are usually applied. Based on this, since the wind turbine generates electricity by the wind driving the wind turbine rotor, during typhoon weather, the wind turbine is equivalent to having to withstand the typhoon directly, and the typhoon load is fully applied to the offshore wind power. In actual applications, in order to further improve the stability of offshore wind power, a set of anti-typhoon control strategies are usually preset for offshore wind power. The control strategy refers to controlling the relevant parameters of the wind turbine rotor to achieve the control of the wind energy input into the wind turbine: when the wind speed is lower than the rated wind speed, the generator rotor speed is adjusted to capture wind energy as much as possible, that is, speed control; when the wind speed is higher than the rated wind speed, due to the limitations of the mechanical and electrical strength and structural strength of the offshore wind power itself, as well as the requirements of the power grid for power supply quality, it is necessary to reduce the captured wind energy to stabilize the output power of the wind turbine at the rated power, that is, power control. Typhoon weather belongs to the situation of too high wind speed. At this time, it is necessary to reduce the windward area of the offshore wind power to reduce the wind load received by the offshore wind power. How to reduce the windward area needs to be determined according to the preset anti-typhoon control strategy. For example, the preset anti-typhoon control strategy can be to rotate the pitch angle of the blades of the wind turbine by 90° to the feather position, or to change the yaw angle of the wind turbine by 90° so that the swept area of the wind turbine is parallel to the wind direction, etc. It can be understood that by introducing the anti-typhoon control strategy, when the integrated model is subjected to the same environmental loads, its stress, strain and ultimate load will be lower than those of the integrated model without the anti-typhoon control strategy.

[0105] Based on this, please refer to Figure 12 , Figure 12 is a flowchart of another integrated design method for offshore wind power provided by this application. When it is determined that the offshore wind power is unqualified, some structural parameters of the offshore wind power are changed, and the iteration number of the offshore wind power is incremented by 1. Then a new integrated model is constructed and it is determined again whether the new integrated model is qualified. If it is unqualified, the structural parameters are continued to be changed and iterated. Before constructing the integrated model, it is first determined whether the iteration number is greater than the preset iteration number. If the iteration number is too large, it means that the offshore wind power has been modified many times and is unqualified and cannot withstand the typhoon directly. At this time, in order to simulate the real situation and reduce the load received by the offshore wind power, it is necessary to enter the anti-typhoon control strategy, and then redesign the offshore wind power based on this. Based on this, by setting the iteration number, the anti-typhoon control strategy is introduced only when the iteration number is too large. Then when the offshore wind power is determined to be qualified when the iteration number is small, it means that the offshore wind power not only meets the design requirements but also can withstand the typhoon directly, and there is a certain design margin while ensuring low cost; when the offshore wind power is determined to be qualified only when the iteration number is too large, although the design margin is small, it can also show that the offshore wind power can ensure stability in actual applications.

[0106] In addition, the preset number of iterations can be set according to actual requirements, for example, it can be 10.

[0107] As a preferred embodiment, before the step of returning to apply the environmental load to the integrated model for a preset duration, it further includes:

[0108] When the preset anti-typhoon control strategy is to rotate the wind turbine rotor and blades to the downwind direction, update the sub-model of the wind turbine according to the preset anti-typhoon control strategy, and update the integrated model according to the sub-model of the wind turbine.

[0109] Considering that there are various anti-typhoon control strategies, some strategies will change the overall structure of the offshore wind power, while some will not. If the control strategy causes a change in the structure of the offshore wind power, the integrated model needs to be updated first, and then the environmental load is applied to make the anti-typhoon control strategy effective. For example, if the control strategy is to adjust the motor speed of the fan, since there is no structural change involved, it has no impact on the integrated model and there is no need to update the integrated model; if the control strategy is to adjust the pitch angle, since the structure of the wind turbine rotor changes, the integrated model needs to be updated, specifically, the pitch angle in the integrated model is updated. Based on this, the integrated model can be changed according to the actual control strategy.

[0110] As a preferred embodiment, after determining that the offshore wind power design is unqualified, it further includes:

[0111] Use the preset particle swarm optimization algorithm to change x structural parameters in the sub-model determined to be greater than, to obtain a new sub-model, where x is a positive integer;

[0112] Update the integrated model according to the new sub-model, and return to the step of constructing the integrated model of the offshore wind power.

[0113] For the sake of simply updating the integrated model, in this application, please refer to Figure 12 , Figure 12The flow chart of another integrated design method for offshore wind power provided by this application. When applying the ultimate load to each sub-model to determine whether each sub-model is qualified, if a sub-model has excessive stress and strain and a new integrated model needs to be rebuilt, obtain the structural parameters in the sub-model with excessive stress and strain, then change its structural parameters to obtain a new sub-model, and then update the new integrated model based on the new sub-model. The direction of change is towards the direction that can reduce the stress and strain of the sub-model. For example, when the sub-model is an offshore foundation model, if the stress or strain of the offshore foundation model is excessive, it means that the structural strength of the offshore foundation is unqualified. The stress and strain of the offshore foundation sub-model can be reduced by increasing the thickness of the offshore foundation model as a structural parameter. The specific value to be increased can be randomly selected within a certain range. Based on this, after determining that the offshore wind power is unqualified, only change the structural parameters of the sub-model with excessive stress or strain, and there is no need to modify the entire integrated model, and the integrated model can be simply updated.

[0114] As a preferred embodiment, determining the ultimate load of the integrated model within a preset time period includes:

[0115] Determining the overall machine response spectrum of the integrated model in terms of structural dynamics within a preset time period;

[0116] Taking the maximum value in the overall machine response spectrum as the ultimate condition of the integrated model;

[0117] Multiplying the ultimate condition by a preset safety factor to obtain the ultimate load of the integrated model within a preset time period;

[0118] Wherein, the overall machine response spectrum is composed of the loads between the connection surfaces of each sub-model.

[0119] In order to simply determine the ultimate load, in this application, because the prior art does not consider the overall load situation of offshore wind power, but calculates the actual loads received by the sub-models. For different loads, different load partial coefficients need to be selected. When considering each load as the dominant load respectively, other loads are multiplied by the corresponding load combination coefficients. Please refer to Figure 10 , Figure 10It is a schematic diagram of the corresponding relationship between the load and the safety factor of the prior art. This method is relatively cumbersome in calculation. In the present application, first, considering the overall load situation of the offshore wind power, a load for simulating the actual application scenario is directly applied to the entire offshore wind power, and the response spectrum of the integrated model when applying the environmental load is determined. The response spectrum specifically includes: the time-history load of the bending moment and shear force at the bottom mud surface of the offshore foundation, the time-history load of the bending moment and shear force at the connection surface between the tower barrel and the offshore foundation, the time-history load of the bending moment and shear force at the connection surface between the nacelle and the tower barrel, the time-history load of the bending moment and shear force at the connection surface between the wind turbine and the nacelle, etc. Since the load spectrum within the preset time duration is loaded in the integrated design and the load changes with time sequence, structural dynamic calculation is performed, and the obtained is the structural dynamic response spectrum that changes with time sequence. In the prior art, since different manufacturers are responsible for different sub-models and the safety factors corresponding to different sub-models are different, it is necessary to multiply various loads by their respective safety factors to obtain the ultimate load, and the maximum values of the loads are selected for the ultimate load, and static calculation is performed, and the obtained is the response spectrum superimposed by various maximum values. Obviously, the limit value extracted from the structural dynamic response spectrum that changes with time sequence is smaller than the response spectrum superimposed by various maximum values. In summary, please refer to Figure 11 , Figure 11 It is a schematic diagram of the corresponding relationship between an extreme condition and the safety factor provided by the present application. Since the loads in the integrated model are already coupled together, the load condition of the entire integrated model can be regarded as DLC (Design Load Case), and there is no need to consider the load combination coefficient of each load item. Therefore, the integrated model has only one safety factor and there is no need to multiply each load by its corresponding coefficient. Based on this, the ultimate load can be simply determined.

[0120] As a preferred embodiment, extreme loads are applied to N specified sub-models respectively, including:

[0121] Extract the sub-response spectra corresponding to the N sub-models from the overall machine response spectrum;

[0122] Take the maximum value in the sub-response spectrum as the extreme load and apply it to the corresponding sub-model.

[0123] In order to further conform to the actual situation, in the present application, when applying the extreme load to the sub-model, the sub-response spectrum corresponding to the sub-model itself can be extracted from the overall machine response spectrum. Specifically, the sub-model can be extracted from the software, and then the environmental load is applied to the sub-model, and the sub-response spectrum of the sub-model is determined according to the overall machine response spectrum and the environmental load. Then, the maximum value in the sub-response spectrum of the sub-model is applied to the sub-model, which can make the extreme load received by the sub-model smaller and more in line with the actual situation of the sub-module itself.

[0124] Please refer to Figure 13 , Figure 13The structural schematic diagram of an integrated design device for offshore wind power provided by this application includes:

[0125] A memory 21 for storing a computer program;

[0126] A processor 22 for implementing the steps of the integrated design method for offshore wind power as described above when executing the computer program.

[0127] For a detailed introduction to the integrated design device for offshore wind power provided by this application, please refer to the embodiments of the integrated design method for offshore wind power described above, and this application will not elaborate herein.

[0128] This application also provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the steps of the integrated design method for offshore wind power as described above.

[0129] For a detailed introduction to the computer-readable storage medium provided by this application, please refer to the embodiments of the integrated design method for offshore wind power described above, and this application will not elaborate herein.

[0130] In this specification, the various embodiments are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the device disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0131] It should also be noted that in this specification, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of another identical element in the process, method, article or device including the said element.

[0132] The foregoing description of the disclosed embodiments enables those skilled in the art to practice or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An integrated design method for offshore wind power, characterized in that, Including: Construct an integrated model of the offshore wind power based on the sub-model of the offshore support structure and the sub-models corresponding to each component of the wind turbine. Apply environmental loads to the integrated model for a preset duration to determine the instantaneous loads at each moment within the preset duration of the integrated model. Among all the instantaneous loads, take the instantaneous load with the maximum load as the ultimate load of the integrated model. Apply the ultimate load to N specified sub-models respectively, and determine whether the stress of the N sub-models under the ultimate load is greater than a first preset limit value and whether the strain is greater than a second preset limit value, where N is a positive integer not greater than the total number of the sub-models. If all N sub-models are determined to be yes, then determine that the design of the offshore wind power is qualified. If there is a sub-model determined to be no, then determine that the design of the offshore wind power is unqualified.

2. The integrated design method for offshore wind power according to claim 1, characterized in that, After constructing the integrated model of the offshore wind power, it further includes: Convert the integrated model into a finite element model. Set a stiffness matrix representing the simulated seabed environment at the bottom of the finite element model. Applying environmental loads to the integrated model for a preset duration includes: Apply the environmental loads for the preset duration to the finite element model with the stiffness matrix.

3. The integrated design method for offshore wind power as described in claim 1, wherein, Before applying environmental loads to the integrated model for a preset duration, it further includes: Determine m structural parameters of the integrated model, where m is a positive integer. After taking the instantaneous load with the maximum load as the ultimate load of the integrated model, it further includes: Determine the stress and strain of the integrated model according to the ultimate load. Judge whether the integrated model meets the preset design requirements according to the m structural parameters, the stress and strain of the integrated model. If so, enter the step of applying the ultimate load to N specified sub-models respectively. If not, use a preset particle swarm optimization algorithm to transform the values of the m structural parameters, and return to the step of constructing the integrated model of the offshore wind power using the new structural parameters.

4. The integrated design method for offshore wind power according to claim 3, characterized in that After using the preset particle swarm optimization algorithm to transform the values of the m structural parameters, it further includes: Increment the total number of iterations of the entire offshore wind power unit by 1. Judge whether the total number of iterations is greater than the preset number of iterations. If so, execute the preset anti-typhoon control strategy corresponding to the offshore wind power.

5. The integrated design method for offshore wind power according to claim 4, characterized in that Before returning to the step of applying environmental loads to the integrated model for a preset duration, it further includes: When the preset anti-typhoon control strategy is to rotate the wind wheel and blades of the wind turbine to the downwind direction, update the sub-model of the wind turbine according to the preset anti-typhoon control strategy, and update the integrated model according to the sub-model of the wind turbine.

6. The integrated design method for offshore wind power according to claim 1, wherein, After determining that the design of the offshore wind power is unqualified, it further includes: Use a preset particle swarm optimization algorithm to change x structural parameters in the sub-model determined to be greater than, to obtain a new sub-model, where x is a positive integer. Update the integrated model according to the new sub-model, and return to the step of constructing the integrated model of the offshore wind power.

7. The integrated design method for offshore wind power according to any one of claims 1 to 6, characterized in that Determining the ultimate load of the integrated model within the preset duration includes: Determine the overall response spectrum of the integrated model in terms of structural dynamics within the preset time duration; Take the maximum value in the overall response spectrum as the limit condition of the integrated model; Multiply the limit condition by a preset safety factor to obtain the limit load of the integrated model within the preset time duration; Wherein, the overall response spectrum is composed of the loads between the connection surfaces of each sub-model.

8. The integrated design method for offshore wind power according to claim 7, characterized in that Apply the limit load to each of the specified N sub-models respectively, including: Extract the sub-response spectra corresponding to the N sub-models from the overall response spectrum; Take the maximum value in the sub-response spectrum as the limit load and apply it to the corresponding sub-model.

9. An integrated design device for offshore wind power, characterized in that Including: A memory for storing computer programs; A processor for implementing the steps of the integrated design method for offshore wind power according to any one of claims 1 to 8 when executing the computer program.

10. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the steps of the integrated design method for offshore wind power according to any one of claims 1 to 8 are implemented.

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