Wind power coupling vibration energy recovery system and wind turbine generator

Abstract

The application provides a wind power coupling vibration energy recovery system and a wind turbine, and relates to the technical field of wind turbines.The wind power coupling vibration energy recovery system comprises a coupling body, an elastic element, a piezoelectric element, a first rectifier circuit and an energy storage module.The elastic element can compensate for deviation and damping and buffering of the coupling body and generate periodic deformation.The piezoelectric element is embedded in the elastic element.The piezoelectric element can generate alternating stress and electric energy along with the periodic deformation of the elastic element.The input end of the first rectifier circuit is electrically connected with the piezoelectric element.The first rectifier circuit can convert alternating current generated by the piezoelectric element into direct current.The input end of the energy storage module is electrically connected with the output end of the first rectifier circuit, and the energy storage module can store direct current.The wind power coupling vibration energy recovery system can effectively utilize the vibration energy of the wind power coupling.

Description

Technical Field

[0001] This application relates to the field of wind turbine technology, and in particular to a wind turbine coupling vibration energy recovery system and a wind turbine. Background Technology

[0002] The transmission system of a wind turbine is one of the core components of wind power generation equipment. Its main function is to transmit the mechanical energy of the wind turbine to the generator through a gearbox, which then increases the speed, and finally converts it into electrical energy. In the transmission system, the coupling, as a key component connecting the gearbox and the generator, must withstand periodic torque fluctuations and mechanical vibrations.

[0003] Due to the instability of wind resources, couplings may experience high-frequency vibrations during operation due to factors such as wind speed changes, gear meshing errors, and mechanical assembly errors.

[0004] Traditional coupling designs only focus on vibration isolation and energy transfer, failing to effectively utilize vibration energy. This results in the loss of this energy as heat or mechanical losses, reducing the overall energy efficiency of the wind turbine. Utility Model Content

[0005] In view of the above problems, this application provides a wind turbine coupling vibration energy recovery system and a wind turbine generator set to solve the problem that wind turbine generator sets do not effectively utilize the vibration energy of wind turbine couplings in the prior art.

[0006] To achieve the above objectives, the embodiments of this application provide the following technical solutions:

[0007] A first aspect of this application provides a wind turbine coupling vibration energy recovery system, comprising:

[0008] The coupling body includes an elastic element, which can compensate for misalignment and dampen vibration of the coupling body and generate periodic deformation.

[0009] A piezoelectric element is embedded within an elastic element; the piezoelectric element can generate alternating stress and produce electrical energy in tandem with the periodic deformation of the elastic element.

[0010] The first rectifier circuit has its input terminal electrically connected to the piezoelectric element; the first rectifier circuit can convert the alternating current generated by the piezoelectric element into direct current.

[0011] The energy storage module has its input terminal electrically connected to the output terminal of the first rectifier circuit, and it can store direct current.

[0012] In one possible implementation, a first groove is formed on the elastic element; the piezoelectric element is adhered to the first groove.

[0013] In one possible implementation, the first rectifier circuit is disposed on the coupling body and rotates with the coupling body; the energy storage module is disposed in a stationary position inside the wind turbine nacelle.

[0014] The wind turbine coupling vibration energy recovery system also includes a slip ring assembly, which has a rotor end and a stator end. The rotor end is located on the coupling body and rotates with the coupling body. The rotor end is electrically connected to the first rectifier circuit. The stator end is located in a stationary position inside the wind turbine nacelle. The stator end is electrically connected to the energy storage module.

[0015] In one possible implementation, the piezoelectric elements are configured as multiple groups, and the multiple groups of piezoelectric elements are connected in parallel; and the number of piezoelectric elements in each group is multiple, and the multiple piezoelectric elements are connected in series.

[0016] In one possible implementation, the coupling body further includes an intermediate body that rotates with the coupling body;

[0017] The wind turbine coupling vibration energy recovery system also includes:

[0018] The cover is arranged radially and spaced apart from the intermediate body. The cover is located in a stationary position inside the wind turbine nacelle. The inner hole of the cover is coaxial with the rotation axis of the coupling body.

[0019] A permanent magnet is fixedly mounted on the outer circumferential surface of the intermediate body; a coil assembly is fixedly mounted on the inner circumferential surface of the casing, and an air gap is formed radially between the coil assembly and the permanent magnet.

[0020] The second rectifier circuit has its input terminal electrically connected to the output terminal of the coil group, and its output terminal electrically connected to the input terminal of the energy storage module.

[0021] In one possible implementation, a second groove is formed radially on the outer peripheral surface of the intermediate body; the permanent magnet is bonded to the second groove.

[0022] In one possible implementation, a plurality of permanent magnets are arranged circumferentially on the intermediate body, the plurality of permanent magnets being evenly arranged along the circumference, and the magnetic poles of two adjacent permanent magnets being alternately arranged; a plurality of coil groups are arranged circumferentially on the cover, the plurality of coil groups being evenly arranged along the circumference.

[0023] In one possible implementation, the second rectifier circuit is disposed on the housing.

[0024] In one possible implementation, the wind turbine coupling vibration energy recovery system further includes an energy management module, which is located at a stationary position inside the wind turbine nacelle. The input end of the energy management module is connected to the energy storage module, and the output end of the energy management module is connected to the auxiliary equipment of the transmission system. The energy management module can dynamically allocate the electrical energy of the energy storage module according to the power demand of the auxiliary equipment.

[0025] A second aspect of this application provides a wind turbine generator set, including the wind turbine coupling vibration energy recovery system as described above.

[0026] The wind turbine coupling vibration energy recovery system provided in this application utilizes an elastic element that, while fulfilling its primary functions of compensating for shaft misalignment and absorbing vibration, undergoes high-frequency periodic mechanical deformation, converting vibration energy into mechanical energy from its repeated deformation. A piezoelectric element embedded within the elastic element directly senses and couples this deformation, converting the alternating mechanical stress acting on the piezoelectric element into high-frequency, low-amplitude alternating current through the piezoelectric effect. This raw alternating current is then fed to a first rectifier circuit for conditioning and conversion, resulting in a smooth, directly usable stable direct current after rectification and filtering. Finally, this direct current is sent to an energy storage module for storage, which then powers the auxiliary equipment of the wind turbine, thereby achieving effective utilization of the vibration energy of the wind turbine coupling.

[0027] In addition to the technical problems solved by the embodiments of this application, the technical features constituting the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions described above, other technical problems that can be solved by the wind power coupling vibration energy recovery system and wind turbine provided by the embodiments of this application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further explained in detail in the specific implementation. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of the wind power coupling vibration energy recovery system provided in the embodiments of this application;

[0030] Figure 2 A schematic diagram of the working principle of the wind power coupling vibration energy recovery system provided in the embodiments of this application;

[0031] Figure 3 for Figure 1 A magnified view of a portion of point A in the middle;

[0032] Figure 4 A front view of the elastic element of the coupling body provided in an embodiment of this application;

[0033] Figure 5 for Figure 4The front view of the assembled elastic element and piezoelectric element shown in the figure;

[0034] Figure 6 A cross-sectional view of the housing and intermediate body provided in the embodiments of this application;

[0035] Figure 7 Assembly diagram of permanent magnet, coil assembly, housing and intermediate body provided in the embodiments of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 10. Coupling body; 11. Elastic element; 111. First groove; 12. Intermediate body; 121. Second groove; 20. Piezoelectric element; 31. First rectifier circuit; 32. Second rectifier circuit; 40. Energy storage module; 50. Slip ring assembly; 51. Rotor end; 52. Stator end; 60. Cover; 61. Permanent magnet; 62. Coil group; 70. Energy management module. Detailed Implementation

[0038] First, those skilled in the art should understand that these embodiments are merely for explaining the technical principles of this application and are not intended to limit the scope of protection of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0039] Secondly, it should be noted that, in the description of the embodiments of this application, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0040] As described in the background section, wind turbines in related technologies have the problem of not effectively utilizing the vibration energy of wind turbine couplings.

[0041] To address the aforementioned technical problems, the wind power coupling vibration energy recovery system provided in this application includes: a coupling body, comprising an elastic element capable of compensating for misalignment and damping vibration of the coupling body and generating periodic deformation; a piezoelectric element embedded within the elastic element; the piezoelectric element generating alternating stress and producing electrical energy in tandem with the periodic deformation of the elastic element; a first rectifier circuit, the input terminal of which is electrically connected to the piezoelectric element; the first rectifier circuit converting the alternating current generated by the piezoelectric element into direct current; and an energy storage module, the input terminal of which is electrically connected to the output terminal of the first rectifier circuit, the energy storage module storing direct current.

[0042] The wind turbine coupling vibration energy recovery system provided in this application utilizes an elastic element that, while fulfilling its primary functions of compensating for shaft misalignment and absorbing vibration, undergoes high-frequency periodic mechanical deformation, converting vibration energy into mechanical energy from its repeated deformation. A piezoelectric element embedded within the elastic element directly senses and couples this deformation, converting the alternating mechanical stress acting on the piezoelectric element into high-frequency, low-amplitude alternating current through the piezoelectric effect. This raw alternating current is then fed to a first rectifier circuit for conditioning and conversion, resulting in a smooth, directly usable stable direct current after rectification and filtering. Finally, this direct current is sent to an energy storage module for storage, which then powers the auxiliary equipment of the wind turbine, thereby achieving effective utilization of the vibration energy of the wind turbine coupling.

[0043] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, 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 a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0044] Please refer to the attached document. Figure 1-7 The first aspect of this application provides a wind turbine coupling vibration energy recovery system, comprising:

[0045] The coupling body 10 includes an elastic element 11, which can compensate for misalignment and dampen vibration of the coupling body 10 and generate periodic deformation.

[0046] The piezoelectric element 20 is embedded in the elastic element 11; the piezoelectric element 20 can generate alternating stress and generate electrical energy in accompaniment to the periodic deformation of the elastic element 11.

[0047] The first rectifier circuit 31 has its input terminal electrically connected to the piezoelectric element 20; the first rectifier circuit 31 can convert the alternating current generated by the piezoelectric element 20 into direct current.

[0048] The energy storage module 40 has its input terminal electrically connected to the output terminal of the first rectifier circuit 31, and the energy storage module 40 can store DC power.

[0049] It should be noted that the elastic element 11 is the core component of the coupling body 10, enabling it to compensate for misalignment (radial, axial, and angular) and perform vibration damping. The elastic element 11 rotates with the coupling body 10, and in performing its functions of misalignment compensation and vibration damping, it undergoes periodic mechanical deformation. Since the piezoelectric element 20 outputs high-frequency, irregular alternating current, it cannot be directly used by most electronic devices or batteries. By setting up a first rectifier circuit 31, the alternating current generated by the piezoelectric element 20 is converted into direct current for effective storage and management. By embedding the piezoelectric element 20 within the elastic element 11, the piezoelectric element 20 directly senses and converts the deformation energy of the elastic element 11, resulting in a short energy transmission path, low loss, and high sensitivity. The embedded design does not require additional space in the coupling body 10, maintaining its original compact structure. While achieving vibration energy recovery from the wind power coupling, it essentially does not affect the original compensation and vibration damping functions of the elastic element 11.

[0050] The wind turbine coupling vibration energy recovery system provided in this application utilizes an elastic element 11 that, while fulfilling its primary functions of compensating for shaft misalignment and absorbing vibration, undergoes high-frequency periodic mechanical deformation, converting vibration energy into mechanical energy generated by its repeated deformation. A piezoelectric element 20 embedded within the elastic element 11 directly senses and couples this deformation, converting the alternating mechanical stress acting on the piezoelectric element 20 into high-frequency, low-amplitude alternating current through the piezoelectric effect. This raw alternating current is then fed to a first rectifier circuit 31 for conditioning and conversion, resulting in a smooth, directly usable stable direct current after rectification and filtering. Finally, this direct current is sent to an energy storage module 40 for storage, which then powers auxiliary equipment of the wind turbine, thereby achieving effective utilization of the vibration energy of the wind turbine coupling.

[0051] Furthermore, the piezoelectric element 20 can be a piezoelectric ceramic sheet.

[0052] Furthermore, the energy storage module 40 can be a battery or a supercapacitor.

[0053] In one possible implementation, please see Figure 4 and Figure 5 As shown, the elastic element 11 has a first groove 111; the piezoelectric element 20 is bonded to the first groove 111.

[0054] In this embodiment, by creating a first groove 111 on the elastic element 11, when the elastic element 11 deforms under force, the stress in the edge region of the abrupt geometric change near the first groove 111 will be higher than in other regions. The piezoelectric element 20 is bonded to the first groove 111, allowing it to directly and efficiently sense and couple this deformation, improving the energy output efficiency per unit deformation, achieving efficient conversion of vibrational mechanical energy into electrical energy, and enhancing power generation efficiency. Furthermore, the first groove 111 provides a mechanical limiting and protective space for the piezoelectric element 20. Bonding the piezoelectric element 20 to the first groove 111 prevents it from detaching from the elastic element 11 under continuous cyclic stress, ensures more sufficient contact between the piezoelectric element 20 and the elastic element 11, results in a more uniform stress distribution, avoids excessive local stress, and ensures long-term reliability.

[0055] Furthermore, the coupling body 10 can be a metal diaphragm wind turbine coupling, and the elastic element 11 can be a metal diaphragm.

[0056] In one possible implementation, the first rectifier circuit 31 is mounted on the coupling body 10 and rotates with the coupling body 10; the energy storage module 40 is mounted in a stationary position inside the wind turbine nacelle.

[0057] Please see Figure 5 As shown, the wind turbine coupling vibration energy recovery system also includes a slip ring assembly 50, which has a rotor end 51 and a stator end 52. The rotor end 51 is disposed on the coupling body 10 and rotates with the coupling body 10. The rotor end 51 is electrically connected to the first rectifier circuit 31. The stator end 52 is disposed in a stationary position inside the wind turbine nacelle and is electrically connected to the energy storage module 40.

[0058] In this embodiment, by integrating the first rectifier circuit 31 onto the coupling body 10 and allowing it to rotate with the coupling body 10, the first rectifier circuit 31 first converts AC power to DC power on the rotating side. DC power has no frequency characteristics and is not sensitive to the inductive and capacitive reactance of the transmission line. When stable and smooth DC power passes through the slip ring assembly 50, losses are reduced, and transmission is more stable and reliable. By placing the energy storage module 40 in a stationary position within the wind turbine nacelle, maintenance, upgrades, or replacements of the energy storage module 40 can be performed without disassembling the coupling body 10, and the complex dynamic balancing problems caused by the added mass of the energy storage module 40 are avoided.

[0059] In this embodiment, the elastic element 11 of the coupling body 10 undergoes periodic mechanical deformation due to vibration. The piezoelectric element 20 embedded inside the elastic element 11 then directly converts this deformation energy into high-frequency alternating current through the piezoelectric effect. This alternating current is immediately transmitted to the first rectifier circuit 31, which also rotates with the coupling body 10, for local rectification and filtering, and is converted into smooth direct current. Subsequently, this direct current is transmitted to the stator end 52 through the rotor end 51 of the slip ring assembly 50, completing the power transmission from the rotating side to the stationary side. Finally, the power is transmitted to the energy storage module 40 located in the stationary position of the engine compartment for storage, thereby preparing for subsequent distribution and utilization, forming a complete energy transmission path from source vibration capture to terminal power storage.

[0060] In one possible implementation, please see Figure 2 As shown, the piezoelectric element 20 is configured in multiple groups, and the multiple groups of piezoelectric elements 20 are connected in parallel; and the number of piezoelectric elements 20 in each group is multiple, and the multiple piezoelectric elements 20 are connected in series.

[0061] In this embodiment, the voltage generated by a single piezoelectric element 20 under minute vibrations is limited. When multiple piezoelectric elements 20 are connected in series, the total output voltage is the sum of the voltages of each individual piezoelectric element 20. A higher voltage more easily overcomes the forward voltage drop of the diodes and line impedance in the subsequent rectifier circuit, ensuring that electrical energy can be effectively collected instead of being consumed in its own loop. When energy is transferred through the slip ring assembly 50 or wires, for a given power, a higher voltage results in a lower current, reducing losses on the transmission line. When multiple series groups are connected in parallel, the total output current of the circuit is the sum of the currents in each branch. If one piezoelectric element 20 in a series circuit fails and becomes open-circuited, only that series circuit fails, and the current becomes zero. However, the other parallel groups can still operate normally; the system only experiences a power decrease, not a complete system failure. If one piezoelectric element 20 in a series circuit is short-circuited, it will significantly reduce the output voltage of that series circuit, but will not affect the normal high-voltage output of the other parallel groups. This ensures that local faults do not lead to the failure of the entire energy recovery system, greatly improving the system reliability and availability in high-maintenance scenarios such as wind turbines.

[0062] In one possible implementation, please see Figure 1 and Figure 3 As shown, the coupling body 10 also includes an intermediate body 12, which rotates with the coupling body 10.

[0063] The wind turbine coupling vibration energy recovery system also includes:

[0064] The cover 60 is arranged radially and spaced apart from the intermediate body 12. The cover 60 is located in a stationary position inside the wind turbine nacelle. The inner hole of the cover 60 is coaxial with the rotation axis of the coupling body 10.

[0065] A permanent magnet 61 is fixedly disposed on the outer peripheral surface of the intermediate body 12; a coil assembly 62 is fixedly disposed on the inner peripheral surface of the cover 60, and an air gap is formed radially between the coil assembly 62 and the permanent magnet 61.

[0066] For the second rectifier circuit 32, please refer to [link / reference]. Figure 2 As shown, the input terminal of the second rectifier circuit 32 is electrically connected to the output terminal of the coil group 62, and the output terminal of the second rectifier circuit 32 is electrically connected to the input terminal of the energy storage module 40.

[0067] In this embodiment, the intermediate body 12 serves as the mounting base for the permanent magnet 61. The intermediate body 12 can withstand enormous centrifugal force, ensuring the safety and positional stability of the permanent magnet 61 under high-speed rotation. Furthermore, the intermediate body 12 better reflects the radial vibration of the coupling body 10, thereby providing the maximum driving displacement for electromagnetic power generation. The coil assembly 62 is fixed to a housing 60 coaxial with the rotation axis of the coupling body 10, and the housing 60 is positioned in a stationary position within the wind turbine nacelle, providing a reference for measuring displacement relative to the rotating components. A radial air gap is formed between the coil assembly 62 and the permanent magnet 61. When the coupling body 10 vibrates, causing periodic changes in the air gap, it induces a drastic change in the magnetic reluctance of the magnetic circuit, leading to a change in the magnetic flux through the coil assembly 62 and generating an induced electromotive force. The second rectifier circuit 32 converts the alternating current generated by the coil assembly 62 into direct current, merging the electromagnetically recovered electrical energy with the piezoelectrically recovered electrical energy, and inputting them uniformly into the energy storage module 40.

[0068] In this embodiment, the piezoelectric energy recovery system is more sensitive to high-frequency, small-amplitude deformations of the elastic element 11 (such as gear meshing impacts) and has higher recovery efficiency. The electromagnetic energy recovery system responds better to low-frequency, large-amplitude radial vibrations of the intermediate body 12 (such as sudden wind speed changes and alignment errors) and can output greater power. The combination of the two systems allows for adaptation to more complex vibration conditions.

[0069] The piezoelectric energy recovery system and the electromagnetic energy recovery system utilize space in different parts of the coupling body 10, without interfering with each other, achieving a high functional density within a compact structure. By configuring a separate first rectifier circuit 31 for the piezoelectric energy recovery system and a separate second rectifier circuit 32 for the electromagnetic energy recovery system, if one system (e.g., the piezoelectric energy recovery system) fails for any reason, the other system (the electromagnetic energy recovery system) can still continue to generate electricity to provide power to critical auxiliary equipment.

[0070] In one possible implementation, please see Figure 6As shown, a second groove 121 is radially formed on the outer peripheral surface of the intermediate body 12; please refer to Figure 3 and Figure 7 As shown, the permanent magnet 61 is bonded to the second groove 121.

[0071] In this embodiment, by forming a second groove 121 on the outer peripheral surface of the intermediate body 12, the permanent magnet 61 is bonded to the second groove 121. On the one hand, the inner wall of the second groove 121 can provide mechanical support for the permanent magnet 61, thereby better anchoring the permanent magnet 61 and preventing the permanent magnet 61 from flying off under the high-speed rotation of the coupling body 10, thus improving the reliability of the permanent magnet 61 fixed on the coupling body 10. On the other hand, by machining the second groove 121 on the outer peripheral surface of the intermediate body 12, it can be ensured that the mounting base surface of the permanent magnet 61 has a high coaxiality, ensuring the uniformity of the air gap between the permanent magnet 61 and the coil group 62.

[0072] Furthermore, the intermediate body 12 can be locally thickened, and a second groove 121 can be opened in the thickened part of the intermediate body 12 to ensure the mechanical properties of the intermediate body 12.

[0073] In one possible implementation, please see Figure 7 As shown, a plurality of permanent magnets 61 are arranged around the intermediate body 12, and the plurality of permanent magnets 61 are evenly arranged along the circumference, with the magnetic poles of two adjacent permanent magnets 61 arranged alternately; a plurality of coil groups 62 are arranged around the cover 60, and the plurality of coil groups 62 are evenly arranged along the circumference.

[0074] In this embodiment, the magnetic poles of every two adjacent permanent magnets 61 are arranged alternately, so that the voltage waveform induced by the coil group 62 is the result of the superposition of multiple sine waves with similar phases. The synthesized waveform is closer to a smooth direct current with a smaller ripple coefficient, which is beneficial for subsequent rectification and filtering, and reduces the requirements for the filtering circuit. The permanent magnets 61 and the coil group 62 are uniformly and symmetrically distributed on the circumference, ensuring the balance between rotating mass and electromagnetic force, and avoiding vibration caused by uneven mass.

[0075] In one possible implementation, the second rectifier circuit 32 is disposed on the housing 60.

[0076] In this embodiment, the coil assembly 62 is fixed to the housing 60, and the second rectifier circuit 32 is also located on the housing 60, achieving "local rectification." The AC power generated by the coil assembly 62 only needs to be transmitted over a short distance to be processed, which helps reduce power transmission loss. When it is necessary to test or replace the second rectifier circuit 32, maintenance personnel only need to open the stationary housing 60 to perform the operation, without disassembling or stopping the entire transmission chain, reducing maintenance time and operational complexity.

[0077] In one possible implementation, please see Figure 2 As shown, the wind turbine coupling vibration energy recovery system also includes an energy management module 70, which is located in a stationary position inside the wind turbine nacelle. The input end of the energy management module 70 is connected to the energy storage module 40, and the output end of the energy management module 70 is connected to the auxiliary equipment of the transmission system. The energy management module 70 can dynamically allocate the electrical energy of the energy storage module 40 according to the power demand of the auxiliary equipment.

[0078] In this embodiment, an energy management module 70 is configured to monitor the remaining power of the energy storage module 40 and the power requirements of each auxiliary device in real time. This allows for dynamic allocation of power from the energy storage module 40 based on the power demands of the auxiliary devices, thereby improving the overall energy utilization efficiency of the entire wind turbine coupling vibration energy recovery system. The energy management module 70 converts the voltage of the energy storage module 40 into a stable, clean DC voltage (e.g., 5V, 12V, 24V), providing high-quality, standardized power to different auxiliary devices and protecting them from voltage fluctuations.

[0079] A second aspect of this application also provides a wind turbine generator set, including the wind turbine coupling vibration energy recovery system as described above.

[0080] Given that the wind turbine in this embodiment includes the wind turbine coupling vibration energy recovery system described in any of the above embodiments, the structure and beneficial effects of the wind turbine including the wind turbine coupling vibration energy recovery system will not be elaborated further in this embodiment.

[0081] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0082] It should be noted that the terms "one embodiment," "embodiment," "exemplary embodiment," "some embodiments," etc., mentioned in the specification indicate that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A vibration energy recovery system for wind turbine couplings, characterized in that, include: The coupling body (10) includes an elastic element (11) that can compensate for deviations and dampen vibrations and generate periodic deformations in the coupling body (10). A piezoelectric element (20) is embedded in the elastic element (11); the piezoelectric element (20) can generate alternating stress and generate electrical energy in accompaniment to the periodic deformation of the elastic element (11); A first rectifier circuit (31) is electrically connected to the piezoelectric element (20) at its input terminal; the first rectifier circuit (31) can convert the alternating current generated by the piezoelectric element (20) into direct current. The energy storage module (40) has its input terminal electrically connected to the output terminal of the first rectifier circuit (31) and can store the DC power.

2. The wind power coupling vibration energy recovery system according to claim 1, characterized in that, The elastic element (11) has a first groove (111); the piezoelectric element (20) is bonded to the first groove (111).

3. The wind power coupling vibration energy recovery system according to claim 2, characterized in that, The first rectifier circuit (31) is mounted on the coupling body (10) and rotates with the coupling body (10); the energy storage module (40) is mounted in a stationary position inside the wind turbine nacelle; The wind turbine coupling vibration energy recovery system further includes a slip ring assembly (50), which has a rotor end (51) and a stator end (52). The rotor end (51) is disposed on the coupling body (10) and rotates with the coupling body (10). The rotor end (51) is electrically connected to the first rectifier circuit (31). The stator end (52) is disposed in a stationary position inside the wind turbine nacelle. The stator end (52) is electrically connected to the energy storage module (40).

4. The wind power coupling vibration energy recovery system according to claim 1, characterized in that, The piezoelectric element (20) is configured in multiple groups, and the multiple groups of piezoelectric elements (20) are connected in parallel; and the number of piezoelectric elements (20) in each group is multiple, and the multiple piezoelectric elements (20) are connected in series.

5. The wind power coupling vibration energy recovery system according to claim 1, characterized in that, The coupling body (10) also includes an intermediate body (12), which rotates with the coupling body (10); The wind power coupling vibration energy recovery system also includes: The cover (60) is arranged radially and spaced apart from the intermediate body (12). The cover (60) is located in a stationary position inside the wind turbine nacelle. The inner hole of the cover (60) is coaxial with the rotation axis of the coupling body (10). A permanent magnet (61) is fixedly disposed on the outer peripheral surface of the intermediate body (12); a coil assembly (62) is fixedly disposed on the inner peripheral surface of the cover (60), and an air gap is formed radially between the coil assembly (62) and the permanent magnet (61); The second rectifier circuit (32) has its input terminal electrically connected to the output terminal of the coil group (62), and its output terminal electrically connected to the input terminal of the energy storage module (40).

6. The wind power coupling vibration energy recovery system according to claim 5, characterized in that, The outer peripheral surface of the intermediate body (12) is provided with a second groove (121) along the radial direction; the permanent magnet (61) is bonded to the second groove (121).

7. The wind power coupling vibration energy recovery system according to claim 5, characterized in that, The intermediate body (12) is provided with a plurality of permanent magnets (61) around its circumference. The plurality of permanent magnets (61) are evenly arranged along the circumference, and the magnetic poles of two adjacent permanent magnets (61) are arranged alternately. The cover (60) is provided with a plurality of coil groups (62) around its circumference. The plurality of coil groups (62) are evenly arranged along the circumference.

8. The wind power coupling vibration energy recovery system according to claim 5, characterized in that, The second rectifier circuit (32) is disposed on the housing (60).

9. The wind power coupling vibration energy recovery system according to any one of claims 1-8, characterized in that, The wind turbine coupling vibration energy recovery system also includes an energy management module (70), which is located in a stationary position inside the wind turbine nacelle. The input end of the energy management module (70) is connected to the energy storage module (40), and the output end of the energy management module (70) is connected to the auxiliary equipment of the transmission system. The energy management module (70) can dynamically allocate the electrical energy of the energy storage module (40) according to the power demand of the auxiliary equipment.

10. A wind turbine generator set, characterized in that, Including the wind power coupling vibration energy recovery system as described in any one of claims 1 to 9 above.

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