Anti-typhoon control method and floating type wind turbine generator

Abstract

The invention discloses an anti-typhoon control method and a floating type wind turbine generator, and relates to the technical field of wind power equipment. The anti-typhoon control method comprises the steps that an anti-typhoon mode to be entered is selected according to the current wind speed, under the condition that the first anti-typhoon mode is entered, the paddle angles of paddles of one part of impellers are adjusted according to a first control strategy, and the paddle angles of paddles of the other part of impellers are adjusted according to a second control strategy, the axis of the impeller deflects relative to the airflow direction to form an included angle. Due to the fact that the first control strategy and the second control strategy are adopted for adjusting the different impellers respectively, the wind resistances of the impellers adjusted according to the different control strategies are different, and therefore the whole floating type wind turbine generator set has certain unbalance and has the torque around the anchor point, and the floating type wind turbine generator set can generate a certain yaw angle. As 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 that the impeller is damaged at the high wind speed can be further reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power equipment, in particular to a typhoon-resistant control method and a floating wind turbine. BACKGROUND

[0002] In recent years, the development of wind farms has gradually developed towards deep sea and large megawatt. At present, the single machine capacity of offshore wind turbines is generally 16-20MW. To continue to expand the single machine capacity is restricted by the technical cost, and the economic benefit is low. The floating wind turbine with double or even multiple impellers is the focus of current model development and research.

[0003] The floating wind turbine floats on the water surface and is moored on the seabed by anchor chains, and can move and rotate freely within a certain range. The wind turbine is at least provided with two groups of wind generator impellers distributed horizontally, the cabin position and direction relative to the tower drum are fixed, and there is no yaw bearing and active yaw system. Therefore, the floating wind turbine in the related art has limited ability to resist typhoon damage. When the wind speed is too large, the impeller of the wind turbine is easy to be damaged. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a typhoon-resistant control method and a floating wind turbine, which can effectively resist high wind speed typhoon and avoid damage.

[0005] In order to achieve the above purpose, the technical scheme adopted by the embodiments of the present application is as follows: In a first aspect, the present application provides a typhoon-resistant control method applied to a floating wind turbine, the floating wind turbine comprising at least two impellers, the impeller comprising a pitch-adjustable blade, the typhoon-resistant control method comprising: selecting a typhoon-resistant mode to be entered according to the current wind speed, the typhoon-resistant mode comprising a first typhoon-resistant mode and a second typhoon-resistant mode; in the case of entering the first typhoon-resistant mode, adjusting the pitch of the blade of a part of the impellers according to a first control strategy and adjusting the pitch of the blade of another part of the impellers according to a second control strategy, so as to deflect the axis of the impeller relative to the airflow direction to form an included angle, wherein the wind resistance coefficient of the impeller adjusted according to any one of the first control strategy and the second control strategy is less than the wind resistance coefficient of the impeller in the power generation state.

[0006] In an optional embodiment, the first control strategy comprises: adjusting the pitch of the blade of the impeller so that the trailing edge of the blade is on the windward side; The second control strategy comprises: adjusting the pitch of the blade of the impeller so that the impeller rotates at a safe speed.

[0007] In an optional embodiment, the safe rotating speed is not greater than 3 .

[0008] In an optional embodiment, in the second control strategy, the adjusting range of the pitch angle of the blades of the impeller is (70°, 90°).

[0009] In an optional embodiment, in the process of adjusting the impeller according to the first control strategy, each blade in the impeller is adjusted in sequence.

[0010] In an optional embodiment, the step of selecting the anti-typhoon mode to be entered according to the current wind speed comprises: selecting the first anti-typhoon mode to be entered when the current wind speed is greater than or equal to a first wind speed; selecting the second anti-typhoon mode to be entered when the current wind speed is less than the first wind speed and greater than or equal to a second wind speed, wherein the first wind speed is greater than the second wind speed; The anti-typhoon control method further comprises: switching between different anti-typhoon modes according to the change of the current wind speed after entering any anti-typhoon mode.

[0011] In an optional embodiment, in the case of entering the second anti-typhoon mode, the blades of each impeller are adjusted according to the first control strategy.

[0012] In an optional embodiment, the floating wind turbine comprises two impellers arranged at intervals in the horizontal direction, and in the case of entering the first anti-typhoon mode, it is determined whether the floating wind turbine has a yawing error; if yes, 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 to be adjusted according to the first control strategy, and the other impeller is selected to be adjusted according to the second control strategy.

[0013] In an optional embodiment, before the step of selecting the anti-typhoon mode to be entered according to the current wind speed, the anti-typhoon control method further comprises: determining whether the floating wind turbine is in a shutdown state when the protection start condition is met; performing the step of selecting the anti-typhoon mode to be entered according to the current wind speed when the floating wind turbine is in the shutdown state; controlling the floating wind turbine to shut down when the floating wind turbine is not in the shutdown state, and then performing the step of selecting the anti-typhoon mode to be entered according to the current wind speed; wherein, when the floating wind turbine is in the shutdown state, the blades of each impeller are in the feathering state, and the protection start condition comprises receiving an anti-typhoon mode execution instruction or monitoring that the current wind speed is higher than a first wind speed threshold.

[0014] In a second aspect, the application provides a floating wind turbine, comprising a processor and a memory, the memory storing executable instructions capable of being executed by the processor, and the processor being capable of executing the executable instructions to implement the anti-typhoon control method of any one of the preceding embodiments.

[0015] The anti-typhoon control method and the floating wind turbine provided by the embodiments of the application can select an anti-typhoon mode to be entered according to the current wind speed, and in the case of entering the first anti-typhoon mode, adjust the pitch angle of the blades of a part of the impellers according to the first control strategy and adjust the pitch angle of the blades of another part of the impellers according to the second control strategy, so as to deflect the axis of the impeller relative to the airflow direction to form an included angle. The wind resistance coefficient of the impeller adjusted according to any one of the first control strategy and the second control strategy is smaller than the wind resistance coefficient of the impeller in the power generation state, and thus the risk of damage of the blades caused by high-speed airflow (such as typhoon) can be reduced to a certain extent. Moreover, since the first control strategy and the second control strategy are respectively used to adjust different impellers, the wind resistance of the impellers adjusted according to different control strategies is different, so that the entire floating wind turbine is unbalanced and has a torque around the anchor point, so as to make the floating wind turbine generate a certain yaw angle. When the yaw angle is generated, the axis of the impeller forms a certain included angle with the airflow direction, and the plane where the impeller is located is no longer perpendicular to the airflow direction, and thus the wind resistance of the entire impeller is further reduced, and the risk of damage of the impeller under high wind speed can be further reduced. It can be seen that the anti-typhoon control method and the floating wind turbine provided by the embodiments of the application can effectively resist high wind speed typhoon and avoid damage.

[0016] In order to make the above objectives, characteristics and advantages of the application more apparent, the following will specifically describe the preferred embodiments of the application with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the application, and thus should not be considered as limiting the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0018] Figure 1 a schematic diagram of the floating wind turbine with yaw error in one embodiment of the application; Figure 2 a schematic diagram of the floating wind turbine in the normal power generation state in one embodiment of the application; Figure 3 a flowchart of the anti-typhoon control method in one embodiment of the application; Figure 4 Figure 1 is a block diagram of a floating wind turbine according to an embodiment of the present application.

[0019] Figure 1 is a block diagram of a floating wind turbine according to an embodiment of the present application. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0021] Therefore, the detailed description of the embodiments of the present application provided below in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0022] It should be noted that the relational terms such as "first" and "second" and the like are used only to distinguish one entity or action from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or actions. Moreover, the terms "comprise", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed or inherent to such a process, method, article or device. Without more limitations, the element defined by the statement "comprising a" does not exclude the presence of additional identical elements in the process, method, article or device including the element.

[0023] In a conventional wind turbine with a single rotor, the rotor is connected to a nacelle, the nacelle is connected to a tower, and the nacelle can rotate relative to the tower to adjust the horizontal orientation of the rotor. By adjusting the horizontal orientation of the rotor (the direction of the rotor axis), the rotor can be directed to face the wind direction during power generation, thereby ensuring a high power generation efficiency. In the case of a typhoon, the horizontal orientation of the rotor can be adjusted to be perpendicular to the wind direction, so that the rotor has a low wind resistance and is less likely to be damaged by high wind speed. However, in a floating wind turbine with multiple rotors, the rotors cannot be adjusted in horizontal orientation relative to the tower, and the entire floating platform is passively moved and rotated within a certain range by the ocean current and wind direction. Since the rotors are symmetrically distributed and in the same plane, under the action of the airflow, the rotors often face the airflow direction. In this case, the power generation efficiency is high; however, when facing high-speed airflow (such as a typhoon), the overall wind resistance of the multiple rotors is large, and the rotors are easily damaged.

[0024] To improve the ability of the floating wind turbine to resist typhoons, an anti-typhoon control method and a floating wind turbine are provided in an embodiment of the present application. By differentially adjusting different rotors in the anti-typhoon mode, the wind resistance of the rotor blades is reduced, and at the same time, the floating wind turbine can also generate a certain yaw angle, further reducing the overall wind area, thereby further reducing the overall wind resistance and improving the ability of the floating wind turbine to resist high wind speed.

[0025] Figure 1 Figure 1 is a schematic diagram of a floating wind turbine 100 with a yaw error in an embodiment of the present application; Figure 2 Figure 2 is a schematic diagram of the floating wind turbine 100 in a normal power generation state in an embodiment of the present application. In the embodiment of the present application, the floating wind turbine 100 includes at least two rotors 140, and the rotor 140 includes rotor blades with adjustable pitch angles. Specifically, in the present embodiment, the floating wind turbine 100 has two rotors 140, and please refer to Figure 1 and Figure 2 The two rotors 140 are symmetrically arranged relative to a plane passing through the anchor point (point O in the figure), and the axes of the two rotors 140 are parallel, and the planes in which the two rotors 140 are located (the planes are perpendicular to the axes of the rotors 140) are the same plane. Figure 1 and Figure 2 The hollow arrow in the figure indicates the direction of the airflow, the dashed line L1 is parallel to the direction of the airflow, and the dashed line L2 is the axis of one of the rotors 140. In 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.

[0026] 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.

[0027] 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: Step S100, in the case of meeting the protection starting condition, it is judged whether the floating wind turbine 100 is in a shutdown state.

[0028] Optionally, the protection starting condition comprises receiving an instruction of executing a typhoon-resistant mode or monitoring 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 is significantly increased, and 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.

[0029] In the embodiment of the application, in the case of determining that the floating wind turbine 100 is in a shutdown state, step S200 is executed; in the case of determining that the floating wind turbine 100 is not in a shutdown state, step S110 is executed: the floating wind turbine 100 is controlled to be shutdown; and then step S200 is executed.

[0030] In the embodiment, only when the floating wind turbine 100 is in a shutdown state (not in a power generation state), the typhoon-resistant mode can be entered to adjust the impeller 140. Optionally, when the floating wind turbine 100 is in a shutdown state, the blades of each impeller 140 are in a feathering state. When the blades of the impeller 140 are in a feathering state, the blades are substantially parallel to the axis of the impeller 140 (for example, the blade angle is 85-95°), at this time the impeller 140 is not easy to be damaged in the scene of high wind speed.

[0031] Step S200, according to the current wind speed, a typhoon-resistant mode to be entered is selected, and the typhoon-resistant mode comprises a first typhoon-resistant mode and a second typhoon-resistant mode.

[0032] Specifically, step S200 comprises: In the case of the current wind speed being greater than or equal to a first wind speed, the first typhoon-resistant mode is selected to be entered; In the case of the current wind speed being less than the first wind speed and greater than or equal to a second wind speed, the second typhoon-resistant mode is selected to be entered, wherein the first wind speed is greater than the second wind speed. Optionally, the first wind speed is 30-40 m / s, for example, 35 m / s; and optionally, the second wind speed is 20-30 m / s, for example, 25 m / s.

[0033] In the embodiment, different typhoon-resistant modes can be selected to be entered for different wind speeds, for example, the first typhoon-resistant mode or the second typhoon-resistant mode. Specifically, the first typhoon-resistant mode can resist a typhoon with a higher wind speed, and the second typhoon-resistant mode can resist a typhoon with a relatively lower wind speed.

[0034] In the case of entering the first anti-typhoon mode, step S300 is performed: According to the first control strategy, the pitch angle of a part of the blades of the impeller 140 is adjusted, and according to the second control strategy, the pitch angle of another part of the blades of the impeller 140 is adjusted, so that the axis of the impeller 140 is deflected relative to the airflow direction to form an angle.

[0035] Wherein, the wind resistance coefficient of the impeller 140 adjusted according to any one of the first control strategy and the second control strategy is less than the wind resistance coefficient of the impeller 140 in the power generation state. It can be understood that when the wind speed is higher than the normal power generation wind speed, the pitch angle needs to be changed to reduce the wind resistance of the impeller 140, so as to protect the impeller 140 from damage. When the impeller 140 is adjusted by different control strategies, the wind resistance of the impeller 140 adjusted by different control strategies is different, so the torque balance established before will be broken, so that the floating wind turbine 100 will rotate relative to the anchor point as a whole, forming a certain yaw error. As introduced before, in the case of yaw error, the plane where the impeller 140 is located is no longer perpendicular to the airflow direction, so the overall wind resistance is further reduced, which is beneficial to resist high wind speed typhoon.

[0036] Optionally, the first control strategy includes adjusting the pitch angle of the blades of the impeller 140 so that the trailing edge of the blades is on the windward side. It can be understood that generally the leading edge of the blades is thicker than the trailing edge, that is, the trailing edge is more sharp. By placing the trailing edge of the blades on the windward side, the wind resistance of the blades can be reduced to a certain extent. Optionally, the adjustment mode of the blades from the shutdown state can be to rotate the blades by half a circle, that is, the orientations of the leading edge and the trailing edge are exchanged. For example, the pitch angle of the blades in the shutdown state is 90°, then the blades are rotated by 180°, so that the pitch angle reaches -90° (or 270°), that is, the adjustment of the first control strategy is completed. Optionally, in the first control strategy, the adjustment rate of the pitch angle is 1 ~5 , such as 3 .

[0037] Further, in the process of adjusting the impeller 140 according to the first control strategy, each blade in the impeller 140 is adjusted in sequence. It can be understood that, since the adjustment is from the feathering state (the leading edge of the blade is on the windward side) to the state that the trailing edge of the blade is on the windward side, there is a case that the blade is perpendicular to the airflow direction during the process, at this time, the wind resistance of the blade reaches the maximum. If each blade of the impeller 140 is adjusted synchronously, the wind resistance may be too large during the process, and the impeller 140 may rotate, which is easy to damage at high wind speed. Therefore, by adjusting each blade in sequence, at most only one blade is in the state of maximum wind resistance at the same time, which is beneficial to avoid that the overall wind resistance of the impeller 140 is too large and the impeller 140 rotates, and reduces the risk of damage. Alternatively, in the process of adjusting the impeller 140 according to the first control strategy, when one blade is adjusted, another blade is started to be adjusted; or, an interval time (for example, 5-60s) is set, and after one blade is started to be adjusted, the next blade is started to be adjusted after waiting for the interval time.

[0038] The second control strategy includes adjusting the pitch angle of the blade of the impeller 140 to make the impeller 140 rotate at a safe speed.

[0039] It can be understood that the impeller 140 rotates at a safe speed refers to that the wind force acting on the impeller 140 is small, and the impeller 140 rotates at a slow speed. Alternatively, the safe speed is 3 The following speed. Taking the feathering state at shutdown as the adjustment basis, by adjusting the pitch angle of the blade slightly, the blade forms a small angle with the airflow direction, and the wind resistance of the blade is slightly increased, so that the impeller 140 can rotate at a safe speed. In the second control strategy, the adjustment range of the pitch angle of the blade of the impeller 140 is (70°, 90°). Taking the feathering state as an example, the pitch angle of 90°, alternatively, the pitch angle can be adjusted to a waiting angle (for example, 80°) first, then the pitch angle is adjusted to make the impeller 140 rotate at a low speed under the action of the wind, and the pitch angle initialization process is completed. Then, the speed of the impeller 140 is continuously monitored, and the pitch angle of the blade is adjusted in real time to make the speed of the impeller 140 maintain at a safe speed (for example, less than 3 ), until the main control system actively exits the first typhoon resistance mode.

[0040] In the embodiment, the floating type wind turbine 100 includes two impellers 140 arranged at intervals in the horizontal direction, and then in the case of entering the first typhoon resistance mode, one of the impellers 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.

[0041] Optionally, in the case of entering the first anti-typhoon mode, it is first determined whether the floating wind turbine 100 has yawing error; if yes, the impeller 140 upstream in the airflow direction is adjusted according to the first control strategy, and the impeller 140 downstream in the airflow direction is adjusted according to the second control strategy; otherwise, one impeller 140 is randomly selected to be adjusted according to the first control strategy, and the other impeller 140 is selected to be adjusted according to the second control strategy. It can be understood that in the shutdown state, the floating wind turbine 100 can already have yawing error, in which case, adjusting the impeller 140 upstream in the airflow direction according to the first control strategy and adjusting the impeller 140 downstream in the airflow direction according to the second control strategy can make the downstream impeller 140 have a larger wind resistance coefficient relative to the upstream impeller 140, so that the yawing angle is further increased, and the wind resistance is further reduced. If, on the contrary, the impeller 140 downstream in the airflow direction is adjusted according to the first control strategy, and the impeller 140 upstream in the airflow direction is adjusted according to the second control strategy, the floating wind turbine 100 is prone to first eliminate the yawing error, so that the plane of the impeller 140 is perpendicular to the airflow direction, and then form a yawing angle; in this process, the wind resistance will first increase and then decrease, so the risk of damage to the impeller 140 will be relatively high, and the efficiency of adjustment will be relatively low. If the floating wind turbine 100 has no yawing error before adjusting the impeller 140, it means that the planes of the two impellers 140 are perpendicular to the airflow direction, and the positions of the two impellers 140 in the airflow direction are the same, so one is randomly selected to be adjusted according to the first control strategy, and the other is adjusted according to the second control strategy.

[0042] In the case of entering the second anti-typhoon mode, step S400 is performed: Adjusting the blades of each impeller 140 according to the first control strategy.

[0043] Since the second anti-typhoon mode is relative to the first anti-typhoon mode, it is aimed at a relatively low wind speed, so it is not necessary to deliberately make the wind turbine yaw to reduce the wind resistance, that is, it is not necessary to adjust different impellers 140 with different control strategies to make the wind resistance coefficients of the impellers 140 different. Adjusting the blades of each impeller 140 to a state with smaller wind resistance, such as adjusting the trailing edge of the blades to the windward side, can reduce the wind resistance coefficient of each impeller 140, so that the impeller 140 can resist general typhoons (wind speed less than the first wind speed and greater than or equal to the second wind speed).

[0044] Optionally, after entering any anti-typhoon mode (such as the first anti-typhoon mode and the second anti-typhoon mode), the wind speed is monitored in real time, and the anti-typhoon modes are switched according to the change of the current wind speed.

[0045] For example, when switching from the first anti-tornado mode to the second anti-tornado mode, first, the blades of the impeller 140 previously adjusted by the second control strategy are feathered (e.g., the pitch angle is 90°); then, the impeller 140 is adjusted according to the first control strategy. The other impeller 140 (the trailing edge is on the windward side) does not need to be adjusted.

[0046] For example, when switching from the second anti-tornado mode to the first anti-tornado mode, first, one of the impellers 140 is selected and its blades are adjusted to the feathered state (e.g., the pitch angle is 90°); then, the impeller 140 is adjusted according to the second control strategy.

[0047] Further, when the floating wind turbine 100 receives an anti-tornado mode exit instruction or detects that the wind speed is lower than the second wind speed threshold, the anti-tornado mode is exited and the stopped state is maintained. Optionally, the second wind speed threshold is 15-30 m / s, such as 25 m / s.

[0048] Specifically, when the floating wind turbine 100 exits from the first anti-tornado mode to the stopped state, the blades of the impeller 140 previously adjusted according to the second control strategy are first adjusted to the feathered state; then, the blades of the impeller 140 previously adjusted according to the first control strategy are adjusted to the feathered state. Until all the blades are in the feathered state, the anti-tornado mode is exited.

[0049] When the floating wind turbine 100 exits from the second anti-tornado mode to the stopped state, the blades of each impeller 140 are simultaneously adjusted to the feathered state, i.e., the anti-tornado mode is exited. Specifically, in the process of adjusting a single impeller 140, each blade in the impeller 140 is adjusted to the feathered state in turn. For example, after one blade is adjusted to the feathered state, the next blade is started to be adjusted; or, an interval time (e.g., 5-60 s) is set, and after one blade is started to be adjusted, the next blade is started to be adjusted after the interval time.

[0050] In the process of adjusting the blades in the above embodiments, if an abnormal state of the pitch actuator (used to adjust the pitch angle) corresponding to a certain blade is encountered, an emergency feathering to the feathered state is attempted by triggering the safety chain, and if the blade still cannot be actuated, the current position of the blade is maintained and the brake is engaged, and the remaining blades are actuated according to the corresponding control strategy. When the external power supply of the wind turbine is disconnected, the wind turbine automatically switches to the backup power supply for power supply.

[0051] Figure 4 A block diagram of the floating wind turbine 100 in an embodiment of the present application is shown in FIG. 1. As shown in FIG. 1, the floating wind turbine 100 includes a tower 110, a nacelle 120, a rotor 130, a yaw system 140, a control system 150, and a power supply system 160. Figure 4As shown, the floating wind turbine 100 includes a memory 110, a processor 120 and a communication module 130. The memory 110, the processor 120 and the communication module 130 are electrically connected with each other directly or indirectly to realize data transmission or interaction. For example, the elements can be electrically connected with each other through one or more communication buses or signal lines. The memory 110 stores executable instructions capable of being executed by the processor 120, and the processor 120 can execute the executable instructions to realize the anti-typhoon control method provided by the embodiments of the present application.

[0052] The memory 110 is configured to store programs or data. The memory 110 can be, but is not limited to, a random access memory (RAM), a read only memory (ROM), a programmable read only memory (PROM), an erasable programmable read only memory (EPROM), an electrically erasable programmable read only memory (EEPROM) and the like.

[0053] The processor 120 is configured to read / write the data or programs stored in the memory 110 and perform corresponding functions. The communication module 130 is configured to establish a communication connection between the server and other communication terminals through a network, and is configured to receive and transmit data through the network.

[0054] In summary, the anti-typhoon control method and the floating wind turbine generator 100 provided by the embodiments of the present application can select an anti-typhoon mode to be entered according to the current wind speed, and in the case of entering the first anti-typhoon mode, adjust the pitch angle of the blades of a part of the impellers 140 according to the first control strategy and adjust the pitch angle of the blades of another part of the impellers 140 according to the second control strategy, so as to deflect the axis of the impeller 140 relative to the airflow direction to form an included angle. The wind resistance coefficient of the impeller 140 adjusted according to any one of the first control strategy and the second control strategy is smaller than the wind resistance coefficient of the impeller 140 in the power generation state, so that the risk of damage of the blades caused by high-speed airflow (such as typhoon) can be reduced to a certain extent. Moreover, since the first control strategy and the second control strategy are respectively used to adjust different impellers 140, the wind resistance of the impellers 140 adjusted according to different control strategies is different, so that the entire floating wind turbine generator 100 is unbalanced and has a torque around the anchor point, so that the floating wind turbine generator 100 can generate a certain yaw angle. When the yaw angle is generated, the axis of the impeller 140 forms a certain included angle with the airflow direction, and the plane where the impeller 140 is located is no longer perpendicular to the airflow direction, so that the wind resistance of the entire impeller 140 is further reduced, and the risk of damage of the impeller 140 under high wind speed can be further reduced. It can be seen that the anti-typhoon control method and the floating wind turbine generator 100 provided by the embodiments of the present application can effectively resist high wind speed typhoon and avoid damage.

[0055] The preferred embodiments of the present application have been described above with reference to the drawings, but the present application is not limited to the above examples, and various modifications and changes can be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present 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 or the second control strategy is less than the drag coefficient of the impeller in the power generation state.

2. The typhoon control method according to claim 1, characterized in that, The first control strategy includes: Adjust the blade angle of the impeller 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.

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

4. The typhoon control method according to claim 2, characterized in that, In the second control strategy, the adjustment range of the blade angle of the impeller is (70°, 90°).

5. The typhoon control method according to claim 2, characterized in that, During the process of adjusting the impeller according to the first control strategy, each blade in the impeller is adjusted sequentially.

6. The typhoon control method according to claim 2, characterized in that, 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 and 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; 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.

7. The typhoon control method according to claim 6, characterized in that, When entering the second typhoon-resistant mode, the blades of each impeller are adjusted according to the first control strategy.

8. The typhoon control method according to claim 2, 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.

9. 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.

10. 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 1-9.

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