Typhoon control method and floating wind turbine

Abstract

The application discloses a typhoon-resistant control method and a floating wind turbine, and relates to the technical field of wind power equipment. The provided typhoon-resistant control method comprises the following steps: selecting a typhoon-resistant mode to be entered according to a current wind speed; in the case of entering a first typhoon-resistant mode, adjusting the pitch angle of the blades of a part of the impellers according to a first control strategy, and adjusting the pitch angle of the blades of another part of the impellers according to a second control strategy, so that the axis of the impeller is deflected relative to the airflow direction to form an included angle. Since the first control strategy and the second control strategy are respectively adopted to adjust different impellers, the wind resistance of the impellers adjusted according to different control strategies is different, so that the whole floating wind turbine is unbalanced, has a torque around an anchor point, and can make the floating wind turbine generate a certain yaw angle. Since the plane where the impeller is located is no longer perpendicular to the airflow direction, the wind resistance of the whole impeller is further reduced, and the risk of damage of the impeller under high wind speed can be further reduced.

Description

Technical Field

[0001] This application relates to the field of wind power equipment technology, and more specifically, to a typhoon-resistant control method and a floating wind turbine. Background Technology

[0002] In recent years, wind farm development has gradually moved towards deep-sea and large-megawatt projects. Currently, the single-unit capacity of offshore wind turbines is generally 16-20MW. Further increasing the single-unit capacity is constrained by technical costs and has low economic benefits. Floating wind turbines with dual or even multiple rotors are currently a hot topic in turbine development and research.

[0003] Floating wind turbines float on the water surface and are moored to the seabed by anchor chains. They can move and rotate freely within a certain range. Each wind turbine is equipped with at least two horizontally distributed sets of wind turbine rotors. The nacelle's position and orientation relative to the tower are fixed, and there is no yaw bearing or active yaw system. Therefore, floating wind turbines in this technology have limited ability to resist typhoon damage; when wind speeds are too high, the turbine rotors are easily damaged. Summary of the Invention

[0004] In view of this, the purpose of this application is to provide a typhoon-resistant control method and a floating wind turbine, which enables the floating wind turbine to effectively resist high-speed typhoons and avoid damage.

[0005] To achieve the above objectives, the technical solutions adopted in the embodiments of this application are as follows:

[0006] In a first aspect, this application provides a typhoon-resistant control method applied to a floating wind turbine generator. The floating wind turbine generator includes at least two rotors, each rotor including blades with adjustable blade angles. The typhoon-resistant control method includes:

[0007] Select the typhoon resistance mode to enter based on the current wind speed. The typhoon resistance modes include the first typhoon resistance mode and the second typhoon resistance mode.

[0008] When entering the first typhoon-resistant mode, the blade angle of a portion of the impeller blades is adjusted according to the first control strategy, and the blade angle of another portion of the impeller blades is adjusted according to the second control strategy, so that the axis of the impeller deflects relative to the airflow direction to form an angle. The drag coefficient of the impeller after adjustment according to either the first or the second control strategy is less than the drag coefficient of the impeller in the power generation state.

[0009] In an optional implementation, the first control strategy includes:

[0010] Adjust the blade angle of the impeller so that the trailing edge of the blade is on the windward side;

[0011] The second control strategy includes:

[0012] Adjust the blade angle of the impeller to make the impeller rotate at a safe speed.

[0013] In an optional implementation, the safe rotational speed is no greater than 3. .

[0014] In an optional implementation, in the second control strategy, the adjustment range of the impeller blade angle is (70°, 90°).

[0015] In an optional implementation, during the process of adjusting the impeller according to the first control strategy, each blade in the impeller is adjusted sequentially.

[0016] In an optional implementation, the step of selecting the desired typhoon-resistant mode based on the current wind speed includes:

[0017] If the current wind speed is greater than or equal to the first wind speed, select to enter the first typhoon resistance mode;

[0018] If the current wind speed is less than the first wind speed but greater than or equal to the second wind speed, select to enter the second typhoon resistance mode, where the first wind speed is greater than the second wind speed;

[0019] Typhoon control methods also include: after entering any typhoon control mode, switching between different typhoon control modes according to changes in the current wind speed.

[0020] In an optional implementation, when entering the second typhoon-resistant mode, the blades of each impeller are adjusted according to the first control strategy.

[0021] In an optional implementation, the floating wind turbine includes two rotors spaced apart in the horizontal direction, and when entering the first typhoon-resistant mode, it is determined whether the floating wind turbine has a yaw error.

[0022] If so, the impeller upstream in the airflow direction is adjusted according to the first control strategy, and the impeller downstream in the airflow direction is adjusted according to the second control strategy; otherwise, one impeller is randomly selected and adjusted according to the first control strategy, and another impeller is selected and adjusted according to the second control strategy.

[0023] In an optional implementation, before the step of selecting the desired typhoon-resistant mode based on the current wind speed, the typhoon-resistant control method further includes:

[0024] Under the condition that the protection start-up conditions are met, determine whether the floating wind turbine is in a shutdown state;

[0025] When the floating wind turbine is in a shutdown state, the procedure is to select the typhoon resistance mode to enter based on the current wind speed.

[0026] If the floating wind turbine is not in a shutdown state, control the floating wind turbine to shut down, and then execute the steps of selecting the typhoon resistance mode to enter based on the current wind speed.

[0027] When the floating wind turbine is in a shutdown state, the blades of each rotor are in a feathering state. The protection start-up conditions include receiving a command to execute the anti-typhoon mode or detecting that the current wind speed is higher than the first wind speed threshold.

[0028] Secondly, this application provides a floating wind turbine generator, including a processor and a memory. The memory stores executable instructions that can be executed by the processor, and the processor can execute the executable instructions to implement the typhoon control method of any of the foregoing embodiments.

[0029] The typhoon-resistant control method and floating wind turbine provided in this application can select the desired typhoon-resistant mode based on the current wind speed. When entering the first typhoon-resistant mode, the blade angles of a portion of the rotor blades are adjusted according to a first control strategy, and the blade angles of another portion of the rotor blades are adjusted according to a second control strategy, causing the rotor axis to deflect relative to the airflow direction, forming an angle. The drag coefficient of the rotor adjusted according to either the first or second control strategy is less than the drag coefficient of the rotor in power generation mode, thus reducing the risk of blade damage from high-speed airflow (such as typhoons) to a certain extent. Furthermore, since different rotors are adjusted using the first and second control strategies respectively, the drag of the rotors adjusted according to different control strategies varies. This results in a certain degree of imbalance in the entire floating wind turbine, with torque around the anchor point, enabling the floating wind turbine to generate a certain yaw angle. When a yaw angle occurs, the impeller axis forms a certain angle with the airflow direction, and the plane containing the impeller is no longer perpendicular to the airflow direction. Therefore, the wind resistance of the entire impeller is further reduced, which can further reduce the risk of damage under high wind speeds. It is evident that the typhoon-resistant control method and floating wind turbine provided in this application embodiment can effectively resist high-speed typhoons and avoid damage.

[0030] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0031] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of a floating wind turbine with yaw error in one embodiment of this application;

[0033] Figure 2 This is a schematic diagram of a floating wind turbine generator in normal power generation state according to one embodiment of this application;

[0034] Figure 3 This is a flowchart of a typhoon-resistant control method in one embodiment of this application;

[0035] Figure 4 This is a block diagram of a floating wind turbine in one embodiment of this application.

[0036] Icons: 100 - Floating wind turbine; 110 - Memory; 120 - Processor; 130 - Communication module; 140 - Impeller. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0039] It should be noted that relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0040] In conventional wind turbines with a single rotor, the rotor is connected to the nacelle, which in turn is connected to the tower. The nacelle can rotate relative to the tower to adjust the rotor's horizontal orientation. By adjusting the rotor's horizontal orientation (the direction of its axis), the rotor can face the wind direction during power generation, ensuring high power efficiency. During typhoons, the rotor's horizontal orientation can be perpendicular to the wind direction, resulting in lower wind resistance and reducing the risk of damage from excessively high wind speeds. However, in floating wind turbines with multiple rotors, the rotors cannot be adjusted horizontally relative to the tower, and active yaw (i.e., the rotor orientation deviates from the airflow direction) is not possible. The entire floating platform passively moves and rotates within a certain range with ocean currents and wind direction. Because the rotors are symmetrically distributed and on the same plane, they often remain facing the airflow direction under the influence of airflow. In this case, high power generation efficiency is achieved; however, when facing the impact of high-speed airflow (such as typhoons), the overall wind resistance of multiple rotors is relatively high, making them prone to damage.

[0041] To improve the typhoon resistance of floating wind turbines, this application provides a typhoon-resistant control method and a floating wind turbine. By differentially adjusting different rotors in typhoon-resistant mode, the blade drag of the rotor is reduced, and the floating wind turbine can also generate a certain yaw angle, further reducing the overall windward area, thereby further reducing the overall wind resistance and improving the floating wind turbine's ability to resist high wind speeds.

[0042] Figure 1 This is a schematic diagram showing a floating wind turbine 100 with yaw error in one embodiment of this application; Figure 2 This is a schematic diagram of a floating wind turbine 100 in normal power generation mode according to one embodiment of this application. In this embodiment, the floating wind turbine 100 includes at least two rotors 140, each rotor 140 including blades with adjustable blade angles. Specifically, this embodiment uses a floating wind turbine 100 with two rotors 140 as an example for description. Please refer to [link to relevant documentation]. Figure 1 and Figure 2 The two impellers 140 are symmetrically arranged with respect to a plane passing through the anchor point (point O in the figure), and the axes of the two impellers 140 are parallel. The plane in which the two impellers 140 are located (this plane is perpendicular to the axis of the impellers 140) is the same plane. Figure 1 and Figure 2 The hollow arrow indicates the airflow direction, the dashed line L1 is parallel to the airflow direction, and the dashed line L2 is the axis of one of the impellers 140. Figure 1In the floating wind turbine 100, there is a certain yaw error. Yaw error refers to the fact that the axis of the rotor 140 forms an angle with the airflow direction, rather than being parallel. Here, the angle between the axis of the rotor 140 and the airflow direction is defined as the yaw angle (represented by A in the diagram). A larger yaw angle A means a larger yaw error, a smaller windward area of ​​the rotor 140, and a lower drag coefficient. During normal power generation, the two rotors 140 are in the same state and have the same drag coefficient. Under the influence of wind force, the two rotors 140 will automatically reach a balanced position, i.e., as shown... Figure 2 As shown, the axis of the impeller 140 is basically parallel to the airflow direction. It can be understood that when the floating wind turbine 100 is generating electricity, a small yaw error is often required, with the yaw angle A approaching zero. The plane containing the impeller 140 is basically perpendicular to the airflow direction. At this time, the impeller 140 has a large lift, and the wind power can efficiently drive the impeller 140 to rotate, thus achieving high power generation efficiency. When the airflow direction changes, the lever arm (relative to anchor point O) of the wind force on the two impellers 140 will differ, generating a torque that rotates around anchor point O. This torque will drive the floating wind turbine 100 to rotate around anchor point O, eventually causing the plane containing the impeller 140 to revert to being perpendicular to the airflow direction, maintaining torque balance. Therefore, when the two impellers 140 are in the same state (with the same drag coefficient), the floating wind turbine 100 can always maintain a state of high power generation efficiency by rotating around the anchor point, ensuring that the axis of the impeller 140 is always approximately the same as the airflow direction.

[0043] In this embodiment, each impeller 140 includes multiple blades, such as three blades. The blade angle can be adjusted, thereby changing the angle between the blade and the plane containing the impeller 140. It can be understood that in this application, the blade angle, or pitch angle, refers to the angle between the airfoil chord line (the line connecting the leading and trailing edges, approximately perpendicular to the leading and trailing edges) and the plane of rotation, which is the plane containing the impeller 140 and is perpendicular to the axis of rotation of the impeller 140. In other words, the blade angle is the angle between the blade and the plane containing the impeller 140. By adjusting the blade angle, the power generation can be adjusted. Under normal power generation conditions, the blade angle is at a relatively small value (e.g., 0~20°), at which point the blade's frontal area is large, the impeller 140 has greater lift, and the power generation efficiency is high. When the blade angle is at a larger angle (e.g., around 90°), the blade is nearly parallel to the airflow, the impeller 140 has less lift, and it is easier to resist high wind speeds.

[0044] When encountering a typhoon, the impeller 140 is subjected to strong winds and is easily damaged. Therefore, it is necessary to adjust the state of the impeller 140 to enable it to withstand high-speed typhoons. Figure 3 This is a flowchart of a typhoon-resistant control method in one embodiment of this application. Figure 3 As shown, the typhoon control method provided in this application includes the following steps:

[0045] Step S100: If the protection start-up conditions are met, determine whether the floating wind turbine 100 is in a shutdown state.

[0046] Optionally, the protection activation conditions include receiving a command to execute the typhoon-resistant mode or detecting that the current wind speed is higher than a first wind speed threshold. The first wind speed threshold can be reasonably set according to the wind force that the impeller 140 can withstand. For example, when the wind speed is greater than the first wind speed threshold, the risk of damage to the impeller 140 increases significantly; when the wind speed is less than the first wind speed threshold, the impeller 140 has better reliability and does not need to enter the typhoon-resistant mode. Optionally, the first wind speed threshold is 20~30 m / s, for example, 25 m / s.

[0047] In this embodiment of the application, if it is determined that the floating wind turbine 100 is in a shutdown state, step S200 is executed; if it is determined that the floating wind turbine 100 is not in a shutdown state, step S110 is executed: control the floating wind turbine 100 to shut down; then step S200 is executed again.

[0048] In this embodiment, the typhoon-resistant mode can only be entered to adjust the rotor 140 when the floating wind turbine 100 is in a shutdown state (not generating electricity). Optionally, when the floating wind turbine 100 is in a shutdown state, the blades of each rotor 140 are in a feathered state. When the blades of the rotor 140 are in a feathered state, the blades are basically parallel to the axis of the rotor 140 (for example, the blade angle is 85°~95°), and the rotor 140 is not easily damaged in high wind speed scenarios.

[0049] Step S200: Select the typhoon resistance mode to be entered based on the current wind speed. The typhoon resistance modes include the first typhoon resistance mode and the second typhoon resistance mode.

[0050] Specifically, step S200 includes:

[0051] If the current wind speed is greater than or equal to the first wind speed, select to enter the first typhoon resistance mode;

[0052] If the current wind speed is less than the first wind speed but greater than or equal to the second wind speed, select to enter the second typhoon resistance mode, where the first wind speed is greater than the second wind speed. Optionally, the first wind speed is 30~40m / s, for example, 35m / s; optionally, the second wind speed is 20~30m / s, for example, 25m / s.

[0053] In this embodiment, different typhoon resistance modes can be selected for different wind speeds, such as the first typhoon resistance mode or the second typhoon resistance mode. Specifically, the first typhoon resistance mode can withstand typhoons with higher wind speeds, while the second typhoon resistance mode can withstand typhoons with relatively lower wind speeds.

[0054] Upon entering the first typhoon-resistant mode, proceed to step S300:

[0055] The blade angle of a portion of the impeller 140 blades is adjusted according to the first control strategy, and the blade angle of another portion of the impeller 140 blades is adjusted according to the second control strategy, so that the axis of the impeller 140 deflects relative to the airflow direction to form an angle.

[0056] Specifically, the drag coefficient of the impeller 140 adjusted according to either the first or second control strategy is lower than that of the impeller 140 in power generation mode. It can be understood that when the wind speed is higher than the normal power generation wind speed, the blade angle needs to be changed to reduce the drag of the impeller 140, thereby protecting it from damage. However, when different control strategies are used to adjust different impellers 140, the drag of the impeller 140 varies depending on the adjustment method. Therefore, the previously established torque balance is broken, causing the floating wind turbine 100 to rotate relative to the anchor point, resulting in a certain yaw error. As mentioned earlier, with yaw error, the plane containing the impeller 140 is no longer perpendicular to the airflow direction, thus further reducing the overall drag and helping to resist high-speed typhoons.

[0057] Optionally, the first control strategy includes adjusting the blade angle of the impeller 140 so that the trailing edge of the blade is on the windward side. It is understood that the leading edge of the blade is usually thicker than the trailing edge, i.e., the trailing edge is sharper. By placing the trailing edge of the blade on the windward side, the wind resistance of the blade can be reduced to some extent. Optionally, adjusting the blade from the stopped state can be done by rotating the blade half a revolution, i.e., reversing the orientation of the leading and trailing edges. For example, if the blade angle is 90° when the machine is stopped, rotating the blade 180° to achieve an angle of -90° (or 270°) completes the adjustment of the first control strategy. Optionally, in accordance with the first control strategy, the blade angle adjustment rate is 1. ~5 For example, 3 .

[0058] Furthermore, during the adjustment of the impeller 140 according to the first control strategy, each blade in the impeller 140 is adjusted sequentially. It is understandable that, during the adjustment from a feathered state (blade leading edge on the windward side) to a blade trailing edge on the windward side, there is a situation where the blades are perpendicular to the airflow direction, at which point the blade resistance reaches its maximum. If all blades of the impeller 140 are adjusted simultaneously, excessive wind resistance may occur, causing the impeller 140 to rotate, which could easily lead to damage at high wind speeds. Therefore, by adjusting each blade sequentially, ensuring that at most one blade is at maximum wind resistance at any given time, it helps to avoid excessive overall wind resistance and rotation of the impeller 140, reducing the risk of damage. Optionally, during the adjustment of the impeller 140 according to the first control strategy, one blade can be adjusted before starting to adjust another; or, an interval time (e.g., 5-60 seconds) can be set, so that after one blade is adjusted, the interval time is waited before adjusting the next blade.

[0059] The second control strategy includes adjusting the blade angle of the impeller 140 to make the impeller 140 rotate at a safe speed.

[0060] It is understandable that the impeller 140 rotating at a safe speed means that it is subjected to relatively small wind forces and rotates at a relatively slow speed. Optionally, the safe speed is 3... The following rotational speeds are adjusted based on the feathering state at shutdown. By slightly adjusting the blade angle, the blades form a small angle with the airflow direction, slightly increasing the blade drag and allowing the impeller 140 to rotate at a safe speed. In the second control strategy, the blade angle adjustment range of the impeller 140 is (70°, 90°). Taking a 90° feathering angle as an example, optionally, the blade angle can be adjusted to a waiting angle (e.g., 80°), and then the blade angle can be adjusted to allow the impeller 140 to rotate at a lower speed under the action of the wind, completing the blade angle initialization process. Then, the rotational speed of the impeller 140 is continuously monitored, and the blade angle is adjusted in real time to maintain its rotational speed at a safe speed (e.g., less than 3). (until the main control system actively exits the first typhoon resistance mode).

[0061] In this embodiment, the floating wind turbine 100 includes two impellers 140 spaced apart in the horizontal direction. When entering the first typhoon-resistant mode, one impeller 140 is selected to be adjusted according to the first control strategy, and the other impeller 140 is adjusted according to the second control strategy.

[0062] Optionally, upon entering the first typhoon-resistant mode, it is first determined whether the floating wind turbine 100 has a yaw error. If so, the upstream rotor 140 in the airflow direction is adjusted according to the first control strategy, and the downstream rotor 140 in the airflow direction is adjusted according to the second control strategy. Otherwise, one rotor 140 is randomly selected for adjustment according to the first control strategy, and another rotor 140 is selected for adjustment according to the second control strategy. It is understood that the floating wind turbine 100 may already have a yaw error in the shutdown state. In this case, adjusting the upstream rotor 140 in the airflow direction according to the first control strategy and the downstream rotor 140 according to the second control strategy can make the downstream rotor 140 have a larger drag coefficient than the upstream rotor 140, thereby further increasing the yaw angle and further reducing wind resistance. Conversely, if the first control strategy is used to adjust the downstream rotor 140 in the airflow direction, and the second control strategy is used to adjust the upstream rotor 140 in the airflow direction, the floating wind turbine 100 can easily eliminate yaw error first, making the plane of rotor 140 perpendicular to the airflow direction, and then forming a yaw angle. During this process, wind resistance will first increase and then decrease, therefore the risk of damage to rotor 140 will be relatively high, and the adjustment efficiency will be relatively low. If the floating wind turbine 100 has no yaw error before adjusting rotor 140, it means that the planes of both rotors 140 are perpendicular to the airflow direction, and their positions in the airflow direction are the same. Therefore, one rotor can be randomly selected for adjustment according to the first control strategy, and the other according to the second control strategy.

[0063] Upon entering the second typhoon preparedness mode, proceed to step S400:

[0064] Adjust the blades of each impeller 140 according to the first control strategy.

[0065] Since the second typhoon-resistant mode targets relatively lower wind speeds compared to the first typhoon-resistant mode, there is no need to intentionally yaw the wind turbine to reduce wind resistance. In other words, there is no need to use different control strategies to adjust the drag coefficients of different rotors 140. By adjusting the blades of each rotor 140 to a state with lower wind resistance using the first control strategy, such as adjusting the trailing edge of the blades to the windward side, the drag coefficient of each rotor 140 can be reduced, making it sufficient to withstand typical typhoons (wind speeds less than the first wind speed and greater than or equal to the second wind speed).

[0066] Optionally, after entering any typhoon resistance mode (such as the first typhoon resistance mode and the second typhoon resistance mode), the wind speed is monitored in real time, and the system switches between different typhoon resistance modes according to changes in the current wind speed.

[0067] Taking the switch from the first typhoon-resistant mode to the second typhoon-resistant mode as an example, firstly, for the impeller 140 that was previously adjusted through the second control strategy, its blades are retracted to a feathered state (e.g., the blade angle is 90°); then, it is adjusted according to the first control strategy. The other impeller 140 (whose trailing edge is already on the windward side) does not require adjustment.

[0068] Taking the switch from the second typhoon resistance mode to the first typhoon resistance mode as an example, firstly, select one of the impellers 140 and adjust its blades to a feathering state (for example, the blade angle is 90°); then, adjust the impeller 140 according to the second control strategy.

[0069] Furthermore, when the floating wind turbine 100 receives a command to exit typhoon-resistant mode or detects that the wind speed is lower than a set second wind speed threshold, it exits typhoon-resistant mode and remains in a shutdown state. Optionally, the second wind speed threshold is 15~30m / s, for example, 25m / s.

[0070] Specifically, when the floating wind turbine 100 exits the first typhoon-resistant mode to the shutdown state, it first controls the impeller 140, which was previously adjusted according to the second control strategy, to adjust the blades to a feathered state; then, it adjusts the impeller 140, which was previously adjusted according to the first control strategy, to adjust the blades to a feathered state. The typhoon-resistant mode is exited once all blades are in a feathered state.

[0071] When the floating wind turbine 100 exits the second typhoon-resistant mode to the shutdown state, the blades of each rotor 140 are simultaneously adjusted to a feathered state, thus exiting the typhoon-resistant mode. Specifically, during the adjustment of a single rotor 140, each blade in the rotor 140 is adjusted to a feathered state sequentially. For example, after one blade is adjusted to a feathered state, the adjustment of the next blade begins; or, an interval time (e.g., 5-60 seconds) is set, and after one blade begins adjustment, the interval time is waited before adjusting the next blade.

[0072] In the above embodiments, during the blade adjustment process, if an abnormal state is encountered in the pitch actuator (used to adjust the pitch angle) corresponding to a certain blade, an emergency pitch retraction to feathering state is attempted using a safety chain. If the blade still cannot move, its current position is maintained and the brake is applied, while the remaining blades perform pitch adjustment according to the corresponding control strategy. When the external power grid supply to the wind turbine is disconnected, the wind turbine automatically switches to the backup power supply.

[0073] Figure 4 This is a block diagram of a floating wind turbine 100 in one embodiment of this application. Figure 4As shown, the floating wind turbine 100 includes a memory 110, a processor 120, and a communication module 130. The memory 110, processor 120, and communication module 130 are electrically connected directly or indirectly to each other to achieve data transmission or interaction. For example, these components can be electrically connected to each other through one or more communication buses or signal lines. The memory 110 stores executable instructions that can be executed by the processor 120, which can execute the executable instructions to implement the typhoon-resistant control method provided in this application embodiment.

[0074] The memory 110 is used to store programs or data. The memory 110 may be, but is not limited to, random access memory (RAM), read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), etc.

[0075] The processor 120 is used to read / write data or programs stored in the memory 110 and execute corresponding functions. The communication module 130 is used to establish communication connections between the server and other communication terminals via a network and to send and receive data via the network.

[0076] In summary, this application provides a typhoon-resistant control method and a floating wind turbine 100. This typhoon-resistant control method can select the desired typhoon-resistant mode based on the current wind speed. When entering the first typhoon-resistant mode, it adjusts the blade angle of a portion of the rotor 140 according to a first control strategy and adjusts the blade angle of another portion of the rotor 140 according to a second control strategy, causing the axis of the rotor 140 to deflect relative to the airflow direction, forming an angle. The drag coefficient of the rotor 140 adjusted according to either the first or second control strategy is less than the drag coefficient of the rotor 140 in power generation mode, thus reducing the risk of blade damage from high-speed airflow (such as typhoons) to a certain extent. Furthermore, since different rotors 140 are adjusted using the first and second control strategies respectively, the drag of the rotors 140 adjusted according to different control strategies varies. This results in a certain degree of imbalance in the entire floating wind turbine 100, with torque around the anchor point, enabling the floating wind turbine 100 to generate a certain yaw angle. When a yaw angle occurs, the axis of the impeller 140 forms a certain angle with the airflow direction, and the plane containing the impeller 140 is no longer perpendicular to the airflow direction. Therefore, the wind resistance of the entire impeller 140 is further reduced, which can further reduce the risk of damage under high wind speeds. It can be seen that the typhoon-resistant control method and the floating wind turbine 100 provided in this application embodiment can effectively resist high-speed typhoons and avoid damage.

[0077] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A typhoon-resistant control method applied to a floating wind turbine, the floating wind turbine comprising at least two impellers, each impeller comprising blades with adjustable blade angles, characterized in that... The typhoon control method includes: Select the typhoon resistance mode to be entered based on the current wind speed. The typhoon resistance mode includes a first typhoon resistance mode and a second typhoon resistance mode. When entering the first typhoon-resistant mode, the blade angle of a portion of the impeller blades is adjusted according to the first control strategy, and the blade angle of another portion of the impeller blades is adjusted according to the second control strategy, so that the axis of the impeller deflects relative to the airflow direction to form an angle. The drag coefficient of the impeller after adjustment according to either the first control strategy or the second control strategy is less than the drag coefficient of the impeller in the power generation state. When entering the second typhoon-resistant mode, the blades of each impeller are adjusted according to the first control strategy; The first control strategy includes: Adjust the blade angle of the impeller to rotate 180° from the feathering state so that the trailing edge of the blade is on the windward side; The second control strategy includes: Adjust the blade angle of the impeller to make the impeller rotate at a safe speed; The steps for selecting the appropriate typhoon preparedness mode based on the current wind speed include: If the current wind speed is greater than or equal to the first wind speed, select to enter the first typhoon resistance mode; If the current wind speed is less than the first wind speed but greater than or equal to the second wind speed, select to enter the second typhoon resistance mode, wherein the first wind speed is greater than the second wind speed.

2. The typhoon control method according to claim 1, characterized in that, The safe rotation speed is no greater than 3. .

3. The typhoon control method according to claim 1, characterized in that, In the second control strategy, the adjustment range of the blade angle of the impeller is (70°, 90°).

4. The typhoon control method according to claim 1, characterized in that, During the process of adjusting the impeller according to the first control strategy, each blade in the impeller is adjusted sequentially.

5. The typhoon control method according to claim 1, characterized in that, The typhoon control method further includes: after entering any typhoon control mode, switching between different typhoon control modes according to the change in the current wind speed.

6. The typhoon control method according to claim 1, characterized in that, The floating wind turbine includes two rotors spaced apart in the horizontal direction. When entering the first typhoon-resistant mode, it is determined whether the floating wind turbine has a yaw error. If so, the impeller upstream in the airflow direction is adjusted according to the first control strategy, and the impeller downstream in the airflow direction is adjusted according to the second control strategy; otherwise, one impeller is randomly selected and adjusted according to the first control strategy, and another impeller is selected and adjusted according to the second control strategy.

7. The typhoon control method according to claim 1, characterized in that, Before the step of selecting the desired typhoon-resistant mode based on the current wind speed, the typhoon-resistant control method further includes: If the protection start-up conditions are met, determine whether the floating wind turbine is in a shutdown state; When the floating wind turbine is in the shutdown state, the step of selecting the typhoon resistance mode to be entered based on the current wind speed is executed. If the floating wind turbine is not in the shutdown state, control the floating wind turbine to shut down, and then execute the step of selecting the typhoon resistance mode to enter based on the current wind speed. When the floating wind turbine is in the shutdown state, the blades of each rotor are in the feathering state, and the protection activation conditions include receiving a command to execute the anti-typhoon mode or detecting that the current wind speed is higher than a first wind speed threshold.

8. A floating wind turbine generator, characterized in that, It includes a processor and a memory, the memory storing executable instructions that can be executed by the processor, the processor executing the executable instructions to implement the typhoon control method according to any one of claims 1-7.

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