An emergency system and method for a tornado-resistant wind turbine blade

Abstract

The application discloses an anti-typhoon wind turbine blade emergency system and method, wherein a heating assembly is arranged at the proximal end of the blade root section of the blade tip section close to the paddle, a positioning device is arranged at the distal end of the blade root section of the blade tip section away from the paddle, after the current wind speed of the environment where the fan is located detected by a wind speed detection device exceeds the design wind speed, the control device determines that a typhoon is coming, switches the working mode of the fan to the anti-typhoon mode, collects the paddle of the fan to the safe position through the variable pitch system, starts the variable pitch brake, and stops the brake to stop the machine, after detecting that the wind speed of the environment where the fan is located exceeds the limit design wind speed, the working mode of the fan is switched to the limit anti-typhoon mode, the standby power supply is started, the heating assembly is controlled to heat the blade tip section, the blade tip positioning signal distance is detected through the positioning device, and after the blade tip positioning signal distance becomes large, it is determined that the blade tip falls off, so that the blade tip section is broken at the specified cross section, and the overall bending load is reduced.

Description

Technical Field

[0001] This invention relates to the field of wind power equipment technology, and in particular to an emergency system and method for typhoon-resistant wind turbine blades. Background Technology

[0002] Offshore wind power is an inevitable choice for coastal countries because it does not occupy land, has abundant offshore wind resources, and is close to the center of electricity load.

[0003] While offshore wind resources are abundant, coastal areas are also frequently hit by typhoons each year. During a typhoon, the strong winds combined with the violent rotation at the typhoon's center create significantly increased turbulence intensity and energy, which can severely damage wind turbines in the affected areas. When a typhoon passes through a wind farm, the wind turbine blades, due to their high position and large swept area, account for 70% or more of the total bending moment load on the tower and foundation. Therefore, the stress on the blades plays a decisive role in the safety of the tower and foundation. Furthermore, among the aforementioned forms of damage, blade damage causes the least loss to the entire turbine, while tower breakage and foundation overturning result in almost 100% damage to the entire wind turbine – situations that must be avoided.

[0004] The main forms of damage caused by typhoons to wind turbines include: blade breakage, blade cracking, tower breakage, and the overturning of the foundation supporting the entire wind turbine. In the manufacturing process of wind turbines, the three blades account for 15% of the total cost, and a single blade accounts for 5%. Completely avoiding typhoon damage to wind turbines would inevitably lead to a significant increase in cost and technical difficulty; currently, there is no corresponding technology that can achieve this goal at a low cost.

[0005] Current typhoon-resistant technologies mostly focus on increasing the design margin of the tower and adding typhoon-resistant structural components such as dampers to reduce the load pressure during typhoons, or adjusting the windward angle of the blades through the pitch system to reduce the stress on the blades. These methods lead to a significant increase in costs, and with the occurrence of super typhoons and the intensification of the rotation of the vortex zone at the typhoon center, the blades and the entire unit may reach their stress limits and collapse, thus failing to fully meet the requirements for typhoon resistance.

[0006] Therefore, how to modify the blades to reduce the bending moment load on the entire tower and foundation when super typhoons pass by, thereby reducing the loss of wind turbines, is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0007] The purpose of this invention is to provide an emergency system and method for wind turbine blades that are resistant to typhoons, so as to reduce the bending moment load generated by the blades on the entire tower and foundation when a super typhoon passes by, thereby reducing the loss of the wind turbine.

[0008] To address the aforementioned technical problems, this invention provides a typhoon-resistant wind turbine blade emergency system, comprising a heating assembly, a positioning device, a backup power supply, and a control device, all installed at the tip of the wind turbine blade. The heating assembly is located near the blade root section of the tip, while the positioning device is located far from the blade root section of the tip. Upon receiving a wind speed detection device indicating that the current wind speed in the environment exceeds the design wind speed, the control device determines that a typhoon is approaching, switches the wind turbine's operating mode to typhoon-resistant mode, retracts the wind turbine blades to a safe position via the pitch control system, and activates the pitch brake. The system automatically stops the fan by applying a brake. Upon detecting that the wind speed in the environment where the fan is located exceeds the design limit, the fan's operating mode is switched to the extreme typhoon resistance mode. The backup power supply is activated, and the heating components are controlled to heat the blade tip section. The positioning device detects the distance to the blade tip positioning signal, and when the distance increases, it is determined that the blade tip has detached. The backup power supply is then shut off, and heating of the blade tip section ceases. The blade root section is made of vinyl ester resin and glass fiber, and the blade tip section is made of unsaturated polyester resin and glass fiber. The transition section between the blade root section and the blade tip section is a glass fiber transition section.

[0009] The device also includes a temperature sensor installed on the blade, which is used to detect the temperature value of the blade tip section. The control device receives the temperature value and sends a trigger signal after detecting that the temperature value has reached a threshold temperature, thereby turning off the backup power supply and stopping the heating of the blade tip section.

[0010] The wind turbine includes a foundation, a tower, and a hub assembly arranged from bottom to top, and the backup power supply is located within the hub assembly.

[0011] The inner surface of the blade tip section is supported and fixed to the heating component by a two-point clamping mechanism on the upper and lower flanges, and the upper and lower inner surfaces of the blade tip section are in close contact with the heating component.

[0012] It also includes a baffle disposed in the transition section to prevent diffusion between the leaf root section and the leaf tip section.

[0013] The heating component is located between the leaf tip segment and the leaf root segment, and the leaf tip segment and the leaf root segment are an integral structure.

[0014] The length of the blade tip is 20%-30% of the blade length.

[0015] The positioning device is either a GPS positioning device or a BeiDou positioning device.

[0016] In addition, embodiments of this application also provide an emergency method for typhoon-resistant wind turbine blades, including:

[0017] Determine whether the wind speed in the current environment where the wind turbine is located exceeds the design wind speed;

[0018] If so, and a typhoon is determined to be approaching, switch the operating mode of the wind turbine to typhoon-resistant mode, retract the blades of the wind turbine to a safe position through the pitch system, activate the pitch brake, and stop the machine by applying the brake.

[0019] Determine whether the wind speed in the environment where the fan is located exceeds the limit design wind speed;

[0020] If so, switch the operating mode of the wind turbine to the extreme typhoon resistance mode;

[0021] Start the backup power supply to heat the tip section of the blades of the wind turbine. The blades include a tip section and a root section. The root section is made of vinyl resin and glass fiber, and the tip section is made of unsaturated polyester resin and glass fiber. The transition section between the root section and the tip section is a glass fiber transition section.

[0022] Once the temperature of the blade tip reaches a threshold temperature, a trigger signal is issued.

[0023] The distance to the leaf tip positioning signal is detected, and the leaf tip is determined to have detached after the distance to the leaf tip positioning signal increases.

[0024] Turn off the backup power supply to stop heating the blade tip section.

[0025] The typhoon-resistant wind turbine blade emergency system and method provided in this invention have the following advantages compared with the prior art:

[0026] The typhoon-resistant wind turbine blade emergency system and method provided in this invention involves placing a heating component near the blade root section at the blade tip and a positioning device at the far end of the blade root section away from the blade tip. When the control device receives a wind speed detection device indicating that the current ambient wind speed exceeds the design wind speed, it determines that a typhoon is approaching, switches the wind turbine's operating mode to typhoon-resistant mode, retracts the turbine blades to a safe position via the pitch control system, activates the pitch brake, and stops the turbine. Upon detecting that the ambient wind speed exceeds the ultimate design wind speed, the wind turbine's operating mode is switched back to typhoon-resistant mode. The system switches to extreme typhoon resistance mode, activates the backup power supply, controls the heating components to heat the blade tip section, detects the distance of the blade tip positioning signal through the positioning device, and determines that the blade tip has detached when the distance of the blade tip positioning signal increases. This means that the section first reaches the stress limit under the action of wind force and produces cracks. Stress concentration effect will continue to occur at the crack, causing the blade tip section to break at the specified section. This reduces the bending load of the entire blade on the tower and wind turbine foundation, realizing the protection of the entire unit in extreme typhoon resistance mode and avoiding excessive damage to the wind turbine foundation and tower caused by the typhoon. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 A schematic diagram of a structure in one embodiment of the typhoon-resistant wind turbine blade emergency system provided by the present invention;

[0029] Figure 2 A schematic diagram of the wind turbine structure in one embodiment of the typhoon-resistant wind turbine blade emergency system provided by the present invention;

[0030] Figure 3 A schematic diagram of the blade structure in one embodiment of the typhoon-resistant wind turbine blade emergency system provided by the present invention;

[0031] Figure 4 A schematic diagram of the step flow structure in one embodiment of the emergency method for typhoon-resistant wind turbine blades provided by the present invention;

[0032] Among them, 10-blade tip section, 20-heating component, 40-positioning device, 30-backup power supply, 50-control device, 90-foundation, 80-tower, 70-hub assembly, and 60-blade root section. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please refer to Figure 1-4 , Figure 1 A schematic diagram of a structure in one embodiment of the typhoon-resistant wind turbine blade emergency system provided by the present invention; Figure 2 A schematic diagram of the wind turbine structure in one embodiment of the typhoon-resistant wind turbine blade emergency system provided by the present invention; Figure 3 A schematic diagram of the blade structure in one embodiment of the typhoon-resistant wind turbine blade emergency system provided by the present invention; Figure 4 This is a schematic diagram of the steps in one embodiment of the emergency method for typhoon-resistant wind turbine blades provided by the present invention.

[0035] In one specific embodiment, the typhoon-resistant wind turbine blade emergency system includes a heating assembly 20, a positioning device 40, a backup power supply 30, and a control device 50, all installed at the tip section 10 of the wind turbine blades. The heating assembly 20 is located near the blade root section 60 of the tip section 10, and the positioning device 40 is located far from the blade root section 60 of the tip section 10. Upon receiving a wind speed detection device indicating that the current wind speed in the environment where the wind turbine is located exceeds the design wind speed, the control device 50 determines that a typhoon is approaching and adjusts the wind turbine's operating... When the operating mode is switched to typhoon-resistant mode, the wind turbine blades are retracted to a safe position via the pitch system, the pitch brake is activated, and the turbine is stopped by holding the brake. After detecting that the wind speed in the environment where the wind turbine is located exceeds the limit design wind speed, the operating mode of the wind turbine is switched to the extreme typhoon-resistant mode, the backup power supply 30 is activated, and the heating component 20 is controlled to heat the blade tip section 10. The blade tip positioning signal distance is detected by the positioning device 40, and when the blade tip positioning signal distance increases, it is determined that the blade tip has detached. The backup power supply 30 is then turned off, and heating of the blade tip section 10 is stopped.

[0036] By placing the heating component 20 near the blade root section 60 of the blade tip section 10, and the positioning device 40 at the far end of the blade root section 60 away from the blade tip section 10, the control device 50, upon receiving a wind speed detection device indicating that the current wind speed in the environment where the wind turbine is located exceeds the design wind speed, determines that a typhoon is approaching, switches the wind turbine's operating mode to typhoon-resistant mode, retracts the wind turbine's blades to a safe position via the pitch control system, activates the pitch brake, and stops the turbine. If the wind speed in the environment where the wind turbine is located exceeds the ultimate design wind speed, the wind turbine's operating mode is switched to ultimate typhoon-resistant mode, and the backup power is activated. Source 30 controls the heating component 20 to heat the blade tip section 10. The positioning device 40 detects the distance to the blade tip positioning signal. When the distance increases, it indicates blade tip detachment, meaning the section reaches its stress limit under wind force and cracks. Stress concentration occurs at the crack, causing the blade tip section 10 to break at the designated section. This reduces the bending load on the tower 80 and turbine foundation 90, protecting the entire unit under extreme typhoon conditions and preventing excessive damage to the turbine foundation 90 and tower 80 from the typhoon.

[0037] To further improve the monitoring of the blades, in one embodiment, the typhoon-resistant wind turbine blade emergency system also includes a temperature sensor installed on the blade. The temperature sensor is used to detect the temperature value of the blade tip section 10. The control device 50 receives the temperature value and sends a trigger signal after detecting that the temperature value has reached a threshold temperature, thereby shutting down the backup power supply 30 and stopping the heating of the blade tip section 10.

[0038] By setting up a temperature sensor, the heating temperature of the blade tip section 10 can be monitored in real time, which improves the reliability of the entire system.

[0039] This application does not specify the type, setting method, or setting location of the temperature sensor.

[0040] This application does not limit the overall structure of the wind turbine. In one embodiment, the wind turbine includes a foundation 90, a tower 80 and a hub assembly 70 arranged from bottom to top, and the backup power supply 30 is disposed in the hub assembly 70.

[0041] This application does not limit the type or installation method of the backup power supply 30.

[0042] This application does not limit the type or installation method of the heating component 20. In one embodiment, the inner surface of the blade tip segment 10 is supported and fixed by a two-point clamping mechanism on the upper and lower flanges, and the upper and lower inner surfaces of the blade tip segment 10 are in close contact with the heating component 20.

[0043] The heating component 20 is supported and fixed by a two-point clamping mechanism on the upper and lower flanges, and the upper and lower inner surfaces of the blade tip 10 are tightly fitted with the heating component 20 to achieve the overall structure of the blade.

[0044] To further improve the efficiency of the breakage without affecting the blade root segment 60, in one embodiment, the blade root segment 60 is made of vinyl ester resin and glass fiber, the blade tip segment 10 is made of unsaturated polyester resin and glass fiber, and the transition segment between the blade root segment 60 and the blade tip segment 10 is a glass fiber transition segment.

[0045] By using different materials for the blade root segment 60 and the blade tip segment 10, the high-temperature deformation temperatures of the blades are different. The blade tip segment 10 uses a low-temperature deformation material, which allows it to deform earlier and separate perfectly from the blade root segment 60, thus improving the overall system reliability.

[0046] This application includes, but is not limited to, the materials described above.

[0047] To further improve manufacturing convenience and subsequent breakage reliability, in one embodiment, the typhoon-resistant wind turbine blade emergency system also includes a baffle disposed in the transition section to prevent diffusion between the blade root section 60 and the blade tip section 10.

[0048] A baffle is placed at the junction to prevent the two materials from diffusing into each other during vacuum injection of resin. Under this method, there is a large difference in heat resistance between the front and rear areas of the blade. When the temperature is between 60℃ and 80℃, the mechanical properties of the blade root section 60 material will not be greatly affected, while the blade tip section 10 material will enter the high-temperature deformation stage, and its strength and stiffness will decrease significantly.

[0049] This application does not impose any restrictions on the material or structure of the baffle.

[0050] Furthermore, to improve ease of installation, in one embodiment, the heating component 20 is located between the blade tip segment 10 and the blade root segment 60, and the blade tip segment 10 and the blade root segment 60 are an integral structure.

[0051] This application does not limit the length and proportion of the blade tip segment 10, and the length of the blade tip segment 10 is 20%-30% of the blade length.

[0052] This application does not limit the type of positioning device 40, which may be a GPS positioning device 40, a Beidou positioning device 40, or other positioning devices 40.

[0053] In one embodiment, the typhoon-resistant wind turbine blade emergency system includes a tower 80, a foundation 90, a hub assembly 70, a blade tip section 10, a blade root section 60, a heating component 20, and a GPS positioning device 40. The overall structure of the wind turbine consists of the foundation 90, the tower 80, the nacelle, the hub, and the blades. The three blades are mounted on the hub via pitch bearings. Each blade is divided into a blade tip section 10 and a blade root section 60. The two parts are made of different resins and glass fibers combined to form the blade's constituent materials. At the junction of the two materials, the heating component 20 is embedded towards the blade tip section 10. The main control system monitors the temperature of the heating device in real time through a temperature monitoring component. Its backup power supply 30 is arranged inside the hub assembly 70, adjacent to the pitch drive backup power supply 30.

[0054] This design can be used as an emergency backup plan when the predicted wind speed exceeds the unit's design limit and the unit's typhoon resistance capability is insufficient under normal typhoon conditions. Based on the differences in heat resistance of different matrix materials, the blades are designed in segments. Different resin materials are used as the matrix materials for the tip section 10 and the root section 60 of the same blade, creating differences in internal mechanical properties and heat resistance. A heating component 20 is pre-embedded at the junction of the different materials, biased towards the tip section 10. The location of this tip section 10 section can be calculated based on historical typhoon data. This example illustrates the design using vinyl ester resin and glass fiber for the root section 60 and unsaturated polyester resin and glass fiber for the tip section 10. With this design, the root section 60 exhibits higher heat resistance and can maintain its original mechanical properties up to 80°C, while the tip section 10 enters a high-temperature deformation stage above 60°C, resulting in a significant decrease in its strength and stiffness.

[0055] When a typhoon is approaching and the predicted wind speed exceeds the design limit, the unit enters the extreme typhoon resistance mode. In advance, the pre-embedded heating component 20 continuously heats the designated section of the blade tip 10, and the temperature is controlled to be stable at 70°C by the temperature monitoring component. This significantly reduces the strength and stiffness of the blade at this section, creating a weak section. When the typhoon arrives, this section is the first to reach its stress limit under the action of the wind force and crack. The crack will continue to generate a stress concentration effect, causing the blade tip 10 to break at this designated section. This reduces the bending load exerted by the entire blade on the tower 80 and the wind turbine foundation 90, thus achieving the protection of the entire unit in the extreme typhoon resistance mode and avoiding excessive damage to the wind turbine foundation 90 and the tower 80 caused by the typhoon.

[0056] Each blade is divided into a root section 60 and a tip section 10. The area located at the front end of the blade is classified as the tip section 10. A heating component 20 is pre-embedded in the cavity at a designated section of the tip section 10. A temperature monitoring component is used to monitor the temperature of this section in real time. A GPS positioning device 40 is installed on the outer side of the tip section 10. The control system of the heating component 20 is integrated into the main control system of the unit. The inner surface of the tip section 10 is supported and fixed by the heating component 20 at two points on the upper and lower flanges. The upper and lower inner surfaces are in close contact with the heating component 20. The arrangement of the heating component 20 will not affect the aerodynamics or overall mechanical performance of the blade.

[0057] Here, the blade root section 60 is made of vinyl ester resin and glass fiber, while the blade tip section 10 is made of unsaturated polyester resin and glass fiber. At the junction of the two, the glass fiber and other reinforcing materials are arranged continuously, with baffles only placed at the junction to prevent the two materials from diffusing into each other during vacuum injection of resin. Under this method, there is a large difference in heat resistance between the front and rear areas of the blade. When the temperature is between 60℃ and 80℃, the mechanical properties of the blade root section 60 material will not be significantly affected, while the blade tip section 10 material will enter the high-temperature deformation stage, and its strength and stiffness will decrease significantly.

[0058] A warning zone is established by extending a certain distance outward from the center of the wind farm. Real-time meteorological data of the wind farm, including the typhoon's path and wind speed, is obtained through wind speed monitoring devices. When the wind speed outside the warning zone exceeds the design wind speed and the turbine is located within the typhoon's path of influence, the main control system recognizes the approaching typhoon, stops normal operation, switches to typhoon-resistant mode, adjusts the blade's windward angle through the pitch system, retracts the pitch to a safe position, activates the pitch brake, and stops the turbine. After completing this series of instructions, the turbine completes the basic 90° typhoon-resistant mode preparation. At the same time, a secondary wind speed prediction is performed. When the wind speed is at the design wind speed but does not exceed the limit design wind speed, the turbine can maintain this state and safely wait for the typhoon to pass. After the typhoon passes, personnel go on the turbine to check its actual condition. Once confirmed to be correct, the turbine can exit the typhoon-resistant mode, release the brake, and the pitch system can be set to feathering mode to resume normal power generation.

[0059] After the unit completes the basic 90-degree typhoon resistance mode preparation, it performs a secondary wind speed identification. If the wind speed is found to be not only greater than the design wind speed but also exceeds the ultimate design wind speed, the main control system, after completing the normal typhoon resistance mode command, continues to execute relevant commands to enter the ultimate typhoon resistance mode. At this time, the backup power supply 30 is activated to control the heating component 20 to heat the fixed section of the blade tip 10, and the temperature at the section is monitored in real time through the temperature monitoring component. The heating is continuously maintained to keep the section temperature at 70°C. When the typhoon arrives, this section has lost its original mechanical properties, and its strength and stiffness have decreased significantly. When subjected to the typhoon, this section is the first to reach the stress limit and produce fracture cracks. Stress concentration effects will continue to occur at the cracks, causing the blade tip 10 to break at this section. At this time, the GPS positioning device 4 installed on the outside of the blade tip... The blade also falls along with the 0. The GPS positioning distance changes and the signal is transmitted to the main control system. It is recognized that the blade has completed the emergency breakage measure. The main control system issues an instruction to shut down the corresponding backup power supply 30 and stop the heating of this blade. All three blades perform this operation at the same time. After the emergency breakage of the blade tips 10 of the three blades is completed, the load on the unit is greatly reduced, and the entire tower 80 and foundation 90 are effectively protected. The unit remains in this state and waits for the typhoon to completely pass. After the typhoon passes, personnel go on the machine to check the actual condition of the unit and blades. According to the actual situation, hoisting machinery is organized to go to sea to use the spare blades to replace the blades of the unit. Damaged blades are returned to the factory for repair and reuse. After installation, the operator manually confirms that the anti-typhoon mode has been exited, releases the brake, and the pitch system is set to feathering state to start normal power generation.

[0060] In addition, embodiments of this application also provide an emergency method for typhoon-resistant wind turbine blades, including:

[0061] S1, determine whether the wind speed in the current environment where the fan is located exceeds the design wind speed;

[0062] If so, S2, if a typhoon is determined to be approaching, switch the working mode of the wind turbine to typhoon-resistant mode, retract the blades of the wind turbine to a safe position through the pitch system, activate the pitch brake, and stop the machine by applying the brake.

[0063] S3, determine whether the wind speed of the environment where the fan is located exceeds the limit design wind speed;

[0064] If so, S4, switch the operating mode of the wind turbine to the extreme typhoon resistance mode;

[0065] S5, start the backup power supply to heat the tip section of the blade of the wind turbine. The blade root section is made of vinyl resin and glass fiber, the blade tip section is made of unsaturated polyester resin and glass fiber, and the transition section between the blade root section and the blade tip section is a glass fiber transition section.

[0066] S6, after detecting that the temperature value of the blade tip segment reaches the threshold temperature, a trigger signal is issued;

[0067] S7, detect the distance of the leaf tip positioning signal, and determine that the leaf tip has fallen off after the distance of the leaf tip positioning signal increases;

[0068] S8, turn off the backup power supply to stop heating the blade tip section.

[0069] The emergency method for typhoon-resistant wind turbine blades is the corresponding method of the emergency system for typhoon-resistant wind turbine blades and has the same beneficial effects. This application does not limit it.

[0070] In this application, after determining that the wind speed in the environment where the wind turbine is located does not exceed the limit design wind speed, it continues to determine whether the wind speed in the current environment where the wind turbine is located exceeds the design wind speed. After determining that the wind speed in the current environment where the wind turbine is located does not exceed the design wind speed, it remains in a waiting state and waits for the typhoon to end.

[0071] In summary, the typhoon-resistant wind turbine blade emergency system and method provided in this embodiment of the invention, by placing the heating component near the blade root section of the blade tip and the positioning device at the far end of the blade root section away from the blade tip, determines that a typhoon is approaching after the control device receives a wind speed detection device indicating that the current wind speed in the environment where the wind turbine is located exceeds the design wind speed. The system then switches the wind turbine's operating mode to typhoon-resistant mode, retracts the wind turbine blades to a safe position via the pitch control system, activates the pitch brake, and stops the turbine. Upon detecting that the wind speed in the environment where the wind turbine is located exceeds the limit design wind speed, the system then switches the wind turbine's operating mode to typhoon-resistant mode. When the operating mode is switched to the extreme typhoon resistance mode, the backup power supply is activated, and the heating components are controlled to heat the blade tip section. The positioning device detects the distance of the blade tip positioning signal, and when the distance of the blade tip positioning signal increases, it is determined that the blade tip has detached. That is, the section first reaches the stress limit under the action of wind force and produces cracks. Stress concentration effect will continue to occur at the crack, causing the blade tip section to break at this designated section. This reduces the bending load of the entire blade on the tower and wind turbine foundation, realizing the protection of the entire unit in the extreme typhoon resistance mode and avoiding excessive damage to the wind turbine foundation and tower caused by the typhoon.

[0072] The above provides a detailed description of the typhoon-resistant wind turbine blade emergency system and method provided by this invention. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A typhoon-resistant wind turbine blade emergency system, characterized in that, The system includes a heating assembly, a positioning device, a backup power supply, and a control device, all installed at the tip of the wind turbine blades. The heating assembly is located near the blade root section of the tip section, while the positioning device is located far from the blade root section. Upon receiving a wind speed detection device indicating that the current wind speed in the environment exceeds the design wind speed, the control device determines that a typhoon is approaching, switches the wind turbine's operating mode to typhoon-resistant mode, retracts the wind turbine blades to a safe position via the pitch control system, activates the pitch brake, and stops the turbine. The system then detects that the wind turbine is in a typhoon-resistant environment. When the wind speed exceeds the design limit, the operating mode of the fan is switched to the extreme typhoon resistance mode, the backup power supply is activated, and the heating component is controlled to heat the blade tip section. The positioning device detects the blade tip positioning signal distance, and when the blade tip positioning signal distance increases, it is determined that the blade tip has detached. The backup power supply is then turned off, and heating of the blade tip section is stopped. The blade root section is made of vinyl ester resin and glass fiber, the blade tip section is made of unsaturated polyester resin and glass fiber, and the transition section between the blade root section and the blade tip section is a glass fiber transition section.

2. The typhoon-resistant wind turbine blade emergency system as described in claim 1, characterized in that, It also includes a temperature sensor installed on the blade, the temperature sensor being used to detect the temperature value of the blade tip section, the control device receiving the temperature value, and issuing a trigger signal after detecting that the temperature value has reached a threshold temperature, shutting off the backup power supply, and stopping the heating of the blade tip section.

3. The typhoon-resistant wind turbine blade emergency system as described in claim 1, characterized in that, The wind turbine includes a foundation, a tower, and a hub assembly arranged from bottom to top, and the backup power supply is located within the hub assembly.

4. The typhoon-resistant wind turbine blade emergency system as described in claim 1, characterized in that, The inner surface of the blade tip section is supported and fixed to the heating component by a two-point clamping mechanism on the upper and lower flanges, and the upper and lower inner surfaces of the blade tip section are in close contact with the heating component.

5. The typhoon-resistant wind turbine blade emergency system as described in claim 4, characterized in that, It also includes a baffle disposed in the transition section to prevent diffusion between the leaf root section and the leaf tip section.

6. The typhoon-resistant wind turbine blade emergency system as described in claim 5, characterized in that, The heating component is located between the leaf tip segment and the leaf root segment, and the leaf tip segment and the leaf root segment are an integral structure.

7. The typhoon-resistant wind turbine blade emergency system as described in claim 6, characterized in that, The length of the blade tip is 20%-30% of the blade length.

8. The typhoon-resistant wind turbine blade emergency system as described in claim 1, characterized in that, The positioning device is a GPS positioning device or a Beidou positioning device.

9. An emergency method for typhoon-resistant wind turbine blades, characterized in that, include: Determine whether the wind speed in the current environment where the wind turbine is located exceeds the design wind speed; If so, and a typhoon is determined to be approaching, switch the operating mode of the wind turbine to typhoon-resistant mode, retract the blades of the wind turbine to a safe position through the pitch system, activate the pitch brake, and stop the machine by applying the brake. Determine whether the wind speed in the environment where the fan is located exceeds the limit design wind speed; If so, switch the operating mode of the wind turbine to the extreme typhoon resistance mode; Start the backup power supply to heat the tip section of the blades of the wind turbine. The blades include a tip section and a root section. The root section is made of vinyl resin and glass fiber, and the tip section is made of unsaturated polyester resin and glass fiber. The transition section between the root section and the tip section is a glass fiber transition section. Once the temperature of the blade tip reaches a threshold temperature, a trigger signal is issued. The distance to the leaf tip positioning signal is detected, and the leaf tip is determined to have detached after the distance to the leaf tip positioning signal increases. Turn off the backup power supply to stop heating the blade tip section.

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