A damping adjustment system for a flexible wind turbine tower and a wind turbine

Abstract

The present invention discloses a damping adjustment system for a flexible wind turbine tower and a wind turbine, which belongs to the field of wind turbines and includes a cable fixing device on a tower, a plurality of damping adjustment units and a control module, wherein: the damping adjustment unit includes a cable-stayed cable, a cable fixing device at the bottom of a tower, a damping adjustment device and an anchoring device connected in sequence; the cable-stayed cable includes a protective sleeve and a cable body installed in the protective sleeve; the cable-stayed cable fixing device on the tower includes a cable fixing barrel section and a plurality of cable anchoring structures uniformly arranged on the cable fixing barrel section in the circumferential direction, and the two ends of each cable-stayed cable are respectively connected to the cable anchoring structure and the cable fixing device at the bottom of the tower; the plurality of damping adjustment devices are all connected to the control module and are jointly controlled by the control module. The present invention collects the cable force or displacement signal of the cable-stayed cable through a sensor through an external cable-stayed cable, significantly reduces the vibration amplitude of the entire onshore wind turbine, reduces the tower load, reduces the weight of the tower, and improves the reliability of the tower.

Description

Technical Field

[0001] The invention relates to the field of wind power generation, and in particular to a damping adjustment system for a flexible wind turbine tower and a wind turbine. Background Art

[0002] The tower is an important component of a wind turbine generator set, which is used to support the nacelle, impeller and other components of the wind turbine generator set. Since the wind turbine is subjected to random wind loads during operation, the tower itself will produce a large amplitude, and the bottom of the tower will also be subject to a large bending moment. As the capacity of onshore wind turbines continues to increase, the unit's own weight, impeller diameter, and tower height have also increased exponentially, especially in low wind speed areas. In order to obtain better wind resources, high or super-high towers of 110m-140m are usually used, which poses great challenges to the safe operation of the unit.

[0003] To improve the reliability of the tower structure, the traditional solution is to increase the wall thickness of the tower, increase the tower diameter, replace high-strength materials or use steel-concrete composite towers, but this will greatly increase the manufacturing cost, and the substantial increase in the structural size will also affect its transportation safety. In order to reduce the overall cost of wind power projects and increase economic benefits, while considering the limitations of production and transportation, flexible tower structures are usually used for ultra-high tower units.

[0004] Compared with traditional rigid towers, flexible towers have relatively thin walls and smaller overall structural dimensions, which can meet a variety of restrictions. The first-order frequency of the flexible tower is low, which may coincide with the crossing frequency of the blades, leading to resonance and having a significant impact on the safe operation of the unit.

[0005] In order to solve the resonance problem that may be caused by the flexible tower, the tower damping can be adjusted. In the prior art, a damping adjustment device is usually placed inside the tower or the cabin to increase the tower damping, and the device absorbs the energy generated by the vibration of the tower and the cabin. However, this method will increase the weight of the tower and the cabin, causing additional load and reducing the service life of the tower. At the same time, the structure of the tower or the cabin needs to be modified, which is difficult to install. Therefore, the additional problems generated in the damping adjustment of the flexible tower need to be further solved. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a damping adjustment system for a flexible wind turbine tower and a wind turbine including the same, which can reduce resonance problems through damping adjustment without internal modification of the flexible tower.

[0007] In order to solve the above technical problems, the technical solutions provided by the present invention are as follows:

[0008] On the one hand, the present invention provides a damping adjustment system for a flexible wind turbine tower, comprising a tower cable fixing device, a plurality of damping adjustment units and a control module, wherein:

[0009] The damping adjustment unit comprises a stay cable, a tower bottom cable fixing device, a damping adjustment device and an anchoring device connected in sequence, wherein the anchoring device is used to be fixed on a foundation;

[0010] The inclined cable comprises a protective sleeve and a cable body installed in the protective sleeve, and the cable body is composed of a plurality of steel wires;

[0011] The cable fixing device on the tower includes a cable fixing barrel and a plurality of cable anchoring structures evenly arranged on the cable fixing barrel in the circumferential direction. The cable fixing barrel is used to be fixedly sleeved on the wind turbine tower. The two ends of each inclined cable are respectively connected to the cable anchoring structure and the cable fixing device at the bottom of the tower; the plurality of inclined cables are symmetrically distributed about the center line of the tower.

[0012] The plurality of damping adjustment devices are all connected to a control module, and the control module jointly controls the plurality of inclined cables and the damping adjustment devices.

[0013] Furthermore, the damping adjustment unit also includes a sensor connected to the damping adjustment device, the sensor is a tension pressure sensor or a displacement sensor, the sensor is also connected to the control module, and the control module controls the damping adjustment device according to data collected by the sensor.

[0014] Furthermore, the damping adjustment device includes a sleeve, a fixed bracket installed at both ends of the sleeve, an excitation coil arranged in the sleeve and a push rod connected to the excitation coil, the push rod passes through the fixed bracket at one end of the sleeve and is connected to the cable fixing device on the tower, and the fixed bracket at the other end of the sleeve is connected to the anchoring device.

[0015] Furthermore, the anchoring device comprises an anchoring plate and anchoring bolts, wherein the anchoring plate is used to be embedded in the anchoring foundation, and the anchoring plate is connected to the damping adjustment device via the anchoring bolts.

[0016] Furthermore, the tower bottom cable fixing device comprises an anchor cup, a locking bolt, a cable sleeve, and a shock absorbing ring and a cable clamp arranged in the cable sleeve; one end of the cable sleeve is provided with an outward fixing flange; one end of the anchor cup is located in the cable sleeve and the other end extends from the fixing flange end of the cable sleeve and is fastened with the locking bolt;

[0017] The lower end of the protective sleeve of the inclined cable passes through the shock-absorbing ring and is fixed by a cable clamp, and the cable body extends out of the lower end of the protective sleeve and passes through the annular hole of the anchor cup. The anchor cup is axially fixed by the locking bolt and the fixing flange to fix the cable body.

[0018] Furthermore, a rain cover is provided at the other end of the cable sleeve, and the inclined cable passes through the rain cover and is connected to the cable sleeve.

[0019] Furthermore, a protective cover is provided at the outer end of the steel wire.

[0020] Furthermore, the inner end of the anchor cup is also connected to a sealing cover, and a through hole for the steel wire to pass through is provided in the middle of the sealing cover.

[0021] Furthermore, the anchor cup is filled with epoxy mortar to fasten the cable body.

[0022] Furthermore, a spoke-type tension and pressure sensor is installed on the anchor cup outside the locking bolt, and the outer end of the anchor cup is also connected to an anchor for anchoring the end of the cable body, and the tension and pressure sensor is fixed on the anchor cup in cooperation with the anchor.

[0023] Furthermore, the cable anchoring structure of the cable fixing device on the tower includes a locking bolt, a cable anchoring sleeve, an anchor arranged in the cable anchoring sleeve and connected to the inclined cable in sequence, a cable clamp and a shock-absorbing ring, the cable anchoring sleeve passes through the cable fixing barrel section and is fixedly connected, and a flange is provided at the end of the cable anchoring sleeve located in the cable fixing barrel section, one end of the anchor extends out from the flange end of the cable anchoring sleeve, and the anchor is axially fixed by the locking bolt and cooperates with the flange to fix the end of the cable body.

[0024] Furthermore, it also includes a protective cover connected to the flange of the cable anchoring sleeve, which is used to protect the end steel wire of the cable body.

[0025] Furthermore, an outer annular reinforcing rib is provided on the outer periphery of the cable fixing cylinder section.

[0026] Furthermore, an inner annular reinforcing rib is provided in the middle of the inner wall of the cable fixing cylinder section.

[0027] Furthermore, the inner wall of the cable fixing cylinder section is provided with a plurality of reinforcing ribs along the axial direction.

[0028] Furthermore, the end of the cable anchoring sleeve located outside the cable fixing cylinder section is also connected to a cable protection tube, so that the inclined cable passes through the cable protection tube and enters the cable anchoring sleeve.

[0029] Furthermore, the control module includes a control box, a microcontroller and a signal conditioner arranged in the control box, a power supply, a switch element and control and power cables, and the microcontroller is used for receiving signals and sending control instructions.

[0030] On the other hand, a wind turbine is provided, comprising a flexible wind turbine tower, wherein the flexible wind turbine tower is connected to the damping adjustment system of the flexible wind turbine tower.

[0031] After adopting such a design, the present invention has at least the following advantages:

[0032] (1) The present invention connects the wind turbine tower and the damping adjustment device at the bottom of the tower through an external inclined cable through a fixing device. The damping adjustment device is connected and fixed by an anchoring device. The inclined cable force or displacement signal is collected by a sensor, and the closed-loop adjustment control of the damping is realized through a controller, thereby significantly reducing the vibration amplitude of the onshore wind turbine, reducing the tower load, reducing the weight of the tower, and improving the reliability of the tower.

[0033] (2) The present invention realizes semi-active control of tower damping by means of symmetrically arranged inclined cables and damping devices external to the wind turbine tower, which can reduce the vibration amplitude of the flexible tower, increase the first-order frequency of the tower, prevent resonance caused by coincidence with the blade crossing frequency, and increase the fatigue life of the tower.

[0034] (3) The present invention uses inclined cables to bear part of the tension, which can reduce the stiffness requirements of the tower. At the same time, each damping adjustment device is independent of the wind turbine tower, so the wall thickness and diameter of the tower can be reduced, thereby reducing the weight of the tower and the manufacturing cost.

[0035] (4) The present invention can realize the overall linkage adjustment of the tower damping by jointly controlling multiple inclined cables and the damping adjustment device, which is helpful for coping with extreme working conditions and reducing the risk of safety accidents such as tower collapse. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0037] Figure 1 This is a front view of the overall structure of an embodiment of a flexible wind turbine tower of the present invention;

[0038] Figure 2 yes Figure 1 The overall structure of the flexible wind turbine tower is shown in the top view;

[0039] Figure 3 It is a schematic diagram of the structure of the tower upper cable fixing cylinder section of the present invention;

[0040] Figure 4 It is a partial cross-sectional schematic diagram of the tower upper cable fixing device of the present invention;

[0041] Figure 5 2 is a half-section schematic diagram of a tower bottom cable fixing device according to Embodiment 1 of the present invention;

[0042] Figure 6It is a schematic diagram of the connection between the inclined cable and the tower bottom cable fixing device, the damping adjustment device, and the sensor in Example 1 of the present invention;

[0043] Figure 7 It is a partial cross-sectional schematic diagram of the damping adjustment device of the present invention;

[0044] Figure 8 is a schematic diagram of a control module of the present invention;

[0045] Fig. 9 It is a schematic diagram of the structure of the anchoring device of the present invention;

[0046] Fig.10 2 is a half-section schematic diagram of a tower bottom cable fixing device according to Embodiment 2 of the present invention;

[0047] Fig.11 This is a schematic diagram of the connection of the basic units of the damping adjustment system of Example 2 of the present invention;

[0048] Description of reference numerals: 1-wind turbine tower; 2-stayed cable; 21-stayed cable body; 22-protective sleeve; 3-stayed cable fixing device on tower; 31-stayed cable fixing cylinder section; 32-external annular reinforcement rib; 33-stayed cable protection tube; 34-stayed cable anchoring sleeve; 35-shock absorbing ring; 36-cable clamp; 37-anchor; 38-locking nut; 39-protective cover; 4-stayed cable fixing device at bottom of tower; 41-rain cover; 42-stayed cable sleeve; 43-shock absorbing ring; 44-cable clamp; 45-anchor cup; 46-sealing cover; 47-locking nut; 48-anchor; 49 -protective cover; 5-damping adjustment device; 51-damper; 511-push rod; 512-excitation coil; 513-sleeve; 52-pressure flange; 53-taper pin; 54-fixing bracket; 541-push rod end fixing bracket; 542-no push rod end fixing bracket; 55-sealing ring; 6-sensor; 7-control module; 71-microcontroller; 72-signal conditioner; 73-power supply; 74-switching element; 75-control and power cables, 76-control box; 8-anchoring device; 81-anchoring foundation; 82-anchoring plate; 83-anchoring bolt. DETAILED DESCRIPTION

[0049] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0050] The present invention provides an embodiment of a damping adjustment system for a flexible wind turbine tower, such as Figures 1 to 11As shown, it includes a tower cable fixing device 3, a plurality of damping adjustment units and a control module 7, wherein:

[0051] The damping adjustment unit includes a cable-stayed cable 2, a cable-stayed cable fixing device 4 at the bottom of the tower, a damping adjustment device 5 and an anchoring device 8 connected in sequence, wherein the anchoring device is used to be fixed on a foundation; the cable-stayed cable 2 includes a protective sleeve 22 and a cable body 21 installed in the protective sleeve 22, wherein the cable body 21 is composed of a plurality of steel wires; the cable-stayed cable fixing device 3 on the tower includes a cable-stayed cable fixing barrel section 31 and a plurality of cable anchoring structures circumferentially evenly arranged on the cable-stayed cable fixing barrel section 31, wherein the cable-stayed cable fixing barrel section 31 is used to be fixedly sleeved on the wind turbine tower 1, and the two ends of each cable-stayed cable 2 are respectively connected to the cable anchoring structure and the cable-stayed cable fixing device 4 at the bottom of the tower; so that the plurality of cable-stayed cables 2 are symmetrically distributed about the center line of the tower; and the plurality of damping adjustment devices 5 are all connected to the control module 7, and the plurality of cable-stayed cables and the damping adjustment devices are jointly controlled by the control module 7.

[0052] When the present invention is in use, the external inclined cable is connected to the wind turbine tower and the damping adjustment device at the bottom of the tower through the fixing device, the damping adjustment device is connected and fixed by the anchoring device, the inclined cable force or displacement signal is collected by the sensor, and the closed-loop adjustment control of the damping is realized through the controller, so as to significantly reduce the vibration amplitude of the onshore wind turbine as a whole, reduce the tower load, reduce the weight of the tower, and improve the reliability of the tower.

[0053] Two embodiments of the present invention may be:

[0054] Embodiment 1:

[0055] like Figure 1 , Figure 2 As shown, the present invention is an onshore flexible wind turbine tower using a cable and its damping adjustment system, comprising a wind turbine tower 1, a cable 2, a cable fixing device 3 on the tower, a cable fixing device 4 at the bottom of the tower, a damping adjustment device 5 and a sensor 6 connected thereto, a control module 7 and an anchoring device 8. The cable fixing device 3 on the tower is connected to the wind turbine tower 1 by high-strength bolts, and multiple cable 2 are arranged at symmetrical angles with respect to the center line of the wind turbine tower 1. Each cable 2, the cable fixing device 4 at the bottom of the tower, the damping adjustment device 5 and the sensor 6 connected thereto, the control module 7 and the anchoring device 8 constitute a basic unit of the damping adjustment system, which is connected to a specific position of the cable fixing device 3 on the tower. Among them, one end of the cable 2 is connected to the cable fixing device 3 on the tower, and the other end is connected to the cable fixing device 4 at the bottom of the tower. One end of the damping adjustment device 5 is connected to the sensor 6, and the other end is connected to the anchoring device 8. The damping adjustment device 5, the sensor 6 and the control module 7 also need to be electrically connected.

[0056] Furthermore, the wind turbine tower 1 is composed of multiple conical steel thin-walled tower sections connected in sequence by flanges, and each flange is connected by high-strength bolts. The preferred tower height is 110-140 meters. In this embodiment, the tower height is 140 meters.

[0057] like Figure 3 , Figure 4 As shown, the cable fixing device 3 on the tower for fixing the inclined cable of the present invention comprises a cable fixing barrel section 31, an outer annular reinforcement rib 32, a cable protection tube 33, a cable anchoring sleeve 34, a shock absorbing ring 35, a cable clamp 36, an anchor 37, a locking nut 38, and a protective cover 39. The cable fixing barrel section 31 is a cylindrical steel thickened structure, and L-shaped flanges are provided on both end surfaces for matching and connecting with the flange of the wind turbine tower 1. The inner wall of the cable fixing barrel section 31 is provided with reinforcement rib plates evenly arranged in the axial and circumferential directions, namely, inner annular reinforcement ribs and axial reinforcement ribs, wherein: the axial reinforcement ribs are arranged in a ring along the horizontal plane of the middle section of the inner wall of the cable fixing barrel section 31, and are welded to the cable fixing barrel section 31, and the circumferential reinforcement rib plates are arranged symmetrically up and down, and are welded to the cable fixing barrel section 31. In order to enhance the structural strength, the outer annular reinforcement ribs 32 are welded to the outer wall of the middle section of the cable fixing barrel section 31. Preferably, the cable fixing barrel section 31 is installed at a distance of about 1 / 3H (H is the tower height) from the top of the tower or 2-3 meters from the bottom of the sweep of the unit blades. In this embodiment, the cable fixing barrel section 31 is installed at a height of 85 meters.

[0058] Furthermore, a plurality of cable anchoring sleeves 34 are evenly arranged circumferentially at the horizontal plane of the middle section of the cable fixing barrel section 31, which are used for fixing the inclined cable to the tower frame, so as to realize balanced load on each cable. A plurality of cable anchoring sleeves 34 are welded and connected to the cable fixing barrel section 31 and the outer annular reinforcement rib 32. A shock absorbing ring 35 for reducing the vibration of the cable is provided in the cable anchoring sleeve 34, and a cable clamp 36 and an anchor 37 for fixing the steel wire inside the inclined cable 2 are provided. The inclined cable 2 is fixed by a locking nut 38 through the cable protection tube 33, the shock absorbing ring 35, the cable clamp 36 and the annular hole of the anchor 37 in turn, and the anchor 37 is filled with epoxy mortar to enhance the anchoring force. The cable protection tube 33 is connected to the cable anchoring sleeve 34, and the gap between the cable and the inclined cable is filled with shock absorbing material to reduce the vibration of the cable and protect the outside of the cable. The locking nut 38 cooperates with the cable anchoring sleeve 34 to achieve axial fixation of the anchor 37, and a protective cover for anti-corrosion is placed at the end of the inclined cable 2. In this embodiment, three identical structures are provided for fixing the inclined cable 2 on the upper part of the tower.

[0059] like Figure 2 , Figure 4 , Figure 5As shown, the multiple inclined cables 2 described in the present invention are arranged at symmetrical angles with respect to the center line of the wind turbine tower 1, which effectively decomposes the lateral force generated by random wind, reduces the bending moment of the tower, and reduces the tower load. The two ends of the inclined cable 2 are respectively connected to the cable fixing device 3 on the tower and the cable fixing device 4 at the bottom of the tower. The inclined cable 2 includes a cable body 21 and a protective sleeve 22. In order to reduce wind-induced vibration, the protective sleeve 22 adopts a PE protective sleeve. Preferably, the inclined cable is 35-50 degrees to the horizontal plane, and 3-6 cables are evenly arranged. Preferably, the inclined cable 2 adopts a steel cable structure, and the interior is formed by a combination of multiple steel wires. In this embodiment, a total of 3 inclined cables are arranged.

[0060] like Figure 5 , Figure 6 As shown, the tower bottom cable fixing device 4 of the present invention comprises a rain cover 41, a cable sleeve 42, a shock absorbing ring 43, a cable clamp 44, an anchor cup 45, a sealing cover 46, a locking nut 47, an anchor 48, and a protective cover 49. The cable sleeve 42 is provided with a shock absorbing ring 43 for reducing cable vibration, a cable clamp 44 and an anchor cup 45 for fixing the steel wire inside the cable, the inclined cable 2 passes through the annular holes of the rain cover 41, the shock absorbing ring 43, the cable clamp 44, the sealing cover 46 and the anchor cup 45 in sequence, and is axially fixed by the locking nut 47, the anchor cup 45 is filled with epoxy mortar to enhance the anchoring force, and the anchor 48 is provided at the end of the tension sensor 6 for fixing the steel wire at the end of the inclined cable 2. The rain cover 41 is riveted to the cable sleeve 42, the sealing cover 46 is bolted to the anchor cup 45, and an anti-corrosion protective cover 49 is provided at the fixed end of the inclined cable 2.

[0061] Furthermore, a sensor 6 is provided between the locking nut 47 and the anchor 48 of the tower bottom cable fixing device 4, which is a tension and pressure measuring sensor. The sensor 6 is a central through hole structure, and the end structure of the inclined cable 2 passes through the central through hole and the annular hole of the pressure flange 52. One end face of the sensor 6 cooperates with the outer end face of the locking nut 47, and the other end face cooperates with the anchor 48 through the pressure flange 52. High-strength bolts pass through the end flange of the cable sleeve 42, the sensor 6 fixing through hole, and the pressure flange 52 fixing through hole in sequence, so as to realize the axial fixation of the sensor 6 with the tower bottom cable fixing device 4 and the pressure flange 52.

[0062] Furthermore, the measuring end face of the sensor 6 cooperates with the outer end face of the anchor 48 to achieve the transmission of the tension pressure of the cable. The power and control signal of the sensor 6 are connected to the control module 7 through a cable. Preferably, the sensor 6 is an active type with a spoke-type structure.

[0063] like Figure 1 , Figure 6 , Figure 7As shown, multiple basic units of the damping adjustment system work together to decompose the bending moment and load on the bottom of the tower, reduce the vibration caused by wind, and reduce the amplitude of the tower. The damping adjustment device 5 includes a damper 51, a pressure flange 52, a cone pin 53, a fixing bracket 54, and a sealing ring 55. The damper 51 adopts a magnetorheological damper, including a push rod 511, an excitation coil 512, and a sleeve 513. When the input signal of the excitation coil 512 changes, the magnetic field strength of the magnetorheological fluid in the damper 51 changes accordingly, and the elongation of the push rod 511 changes, thereby changing the damping force of the magnetorheological damper 51.

[0064] Furthermore, the pressure-bearing flange 52 is a symmetrical structure at both ends, and the connection of the flanges at both ends is achieved through a welded cylindrical steel structure. The push rod 511 is rigidly connected to the fixing hole at one end of the pressure-bearing flange 52 through a tapered pin 53, and the end of the tapered pin 53 is a threaded structure, which is tightened by a nut after being fixed. The other end of the pressure-bearing flange 52 is connected to the flange of the tower bottom cable fixing device 4 through a high-strength bolt, so as to achieve real-time adjustment and transmission of the cable force of the inclined cable 2.

[0065] Furthermore, the damper 51 is provided with fixing brackets 541 and 542 at both ends, and the fixing brackets at both ends are connected by high-strength bolts, and the fixing bracket 542 at the end without a push rod is connected to the anchor foundation bolt 83. The gap between the fixing bracket 54 and the damper 51 is filled with shock-absorbing material to reduce the vibration of the damper. The fixing bracket 54 is bolted to the sealing ring 55, and reinforcing ribs are evenly arranged on the outer wall of the bracket.

[0066] like Figure 8 As shown, the control module 7 of the present invention comprises a microcontroller 71, a signal conditioner 72, a power supply 73, a switch element 74, a control and power cable 75, a control box 76 and control software. The control module 7 is used for receiving signals and sending control instructions, and is divided into a master station and a slave station according to the function. The slave station is used to receive the output signals of the damper and the force sensor in the basic unit of the damping adjustment system to which it belongs, the control instructions from the master station and send the received input signals to the master station; in addition to the functions of the slave station, the master station is used for the joint control of multiple basic units of the damping adjustment system, so as to effectively realize the dynamic adjustment of the damping of the entire tower and reduce the load and amplitude of the tower. The specific control method is as follows: the output signals of the dampers and force sensors of the basic units of each damping adjustment system are received in real time by the microcontroller through the signal conditioner, the master station control software analyzes the forces and damping forces of each inclined cable, the master station controller sends a control signal to each slave station, and the control current or control voltage of each damper is adjusted through feedback control, and the damper receiving the control signal from the slave station adjusts the damping force and the elongation of the push rod, thereby realizing the dynamic adjustment of the tower damping. The preferred master station microcontroller is one of an industrial computer, a single-chip microcomputer, and an FPGA, and the slave station microcontroller is one of a PLC, a single-chip microcomputer, and an FPGA.

[0067] Furthermore, the microcontroller 71, the signal conditioner 72, and the switch element 74 are connected via control cables, and connected to the power supply 73 via power cables. The slave station is connected to the master station microcontroller via control cables. The electrical components of the control module are placed in a control box 76 connected to the anchor foundation.

[0068] like Fig. 9 As shown, the anchoring device 8 of the present invention comprises an anchoring foundation 81, an anchoring plate 82 and an anchoring bolt 83. The anchoring bolt 83 passes through the fixing through hole of the anchoring plate 82 and is connected to the fixing bracket 542 of the damper without a push rod end, and is arranged parallel and symmetrically with the center line of the inclined cable. The angle between the anchoring bolt and the embedded plate and the ground is equal to the angle between the inclined cable and the ground. To ensure uniform loading, 4 or 6 bolts are used as anchoring bolts. The anchoring plate 82 is embedded in the anchoring foundation 81. Preferably, the distance between the anchoring plate 82 and the upper surface of the anchoring foundation 81 is at least 1.2m. In this embodiment, 4 bolts are used as anchoring bolts.

[0069] Embodiment 2:

[0070] The difference between this embodiment and embodiment 1 is that, in this embodiment, the sensor is a displacement sensor, which is arranged on the end surface of the damper bracket, and the control module uses a position signal as a damping adjustment control signal.

[0071] like Fig.10 As shown, the tower bottom cable fixing device 4 of embodiment 2 of the present invention comprises a rain cover 41, a cable sleeve 42, a shock absorbing ring 43, a cable clamp 44, an anchor cup 45, a sealing cover 46, a locking nut 47, an anchor 48, and a protective cover 49. The cable sleeve 42 is provided with a shock absorbing ring 43 for reducing cable vibration, a cable clamp 44 and an anchor cup 45 for fixing the steel wire inside the cable, the inclined cable 2 passes through the annular holes of the rain cover 41, the shock absorbing ring 43, the cable clamp 44, the sealing cover 46 and the anchor cup 45 in sequence, and is axially fixed by the locking nut 47, the anchor cup 45 is filled with epoxy mortar to enhance the anchoring force, and the anchor 48 is provided at the end of the anchor cup 45 for fixing the steel wire at the end of the inclined cable 2. The rain cover 41 is riveted to the cable sleeve 42, the sealing cover 46 is bolted to the anchor cup 45, and an anti-corrosion protective cover 49 is provided at the fixed end of the inclined cable 2.

[0072] like Fig.10 , Fig.11 As shown, the pressure-bearing flange 52 of the damping adjustment device 5 is a symmetrical structure at both ends, and the connection of the flanges at both ends is achieved by a welded cylindrical steel structure. The push rod 511 is rigidly connected to the fixing hole at one end of the pressure-bearing flange 52 through a tapered pin 53, and the end of the tapered pin 53 is a threaded structure, which is tightened by a nut after being fixed. The other end of the pressure-bearing flange 52 is connected to the end flange of the tower bottom cable fixing device 4 by bolts, so as to achieve real-time adjustment and transmission of the position of the inclined cable 2.

[0073] Furthermore, the damper 51 is provided with fixing brackets 541 and 542 at both ends, and the fixing brackets at both ends are connected by high-strength bolts, and the fixing bracket 542 at the end without a push rod is connected to the anchor foundation bolt 83. The gap between the fixing bracket 54 and the damper 51 is filled with shock-absorbing material to reduce the vibration of the damper. The fixing bracket 54 is bolted to the sealing ring 55, and reinforcing ribs are evenly arranged on the outer wall of the bracket.

[0074] Furthermore, a displacement sensor 6 is provided at the end of the damper push rod end fixing bracket 541 and is connected to the damper push rod end fixing bracket 541 by bolts.

[0075] The sensor measures the cable expansion and contraction by measuring the displacement signal between the end face of the damper push rod end bracket 541 and the end face of the pressure flange 52. The power and control signal of the sensor 6 are connected to the control module 7 through a cable. Preferably, the sensor 6 is a laser displacement sensor.

[0076] like Figure 8 , Fig.11 As shown, the control module 7 includes a microcontroller 71, a signal conditioner 72, a power supply 73, a switch element 74, a control and power cable 75, a control box 76 and control software. The control module 7 is used to receive signals and send control instructions. It is divided into a master station and a slave station according to its function. The slave station is used to receive the output signals of the damper and displacement sensor in the basic unit of the damping adjustment system to which it belongs, the control instructions from the master station and send the received input signals to the master station; in addition to the functions of the slave station, the master station is used for the joint control of multiple basic units of the damping adjustment system, so as to effectively realize the dynamic adjustment of the damping of the entire tower and reduce the load and amplitude of the tower. The specific control method is as follows: the output signals of the dampers and displacement sensors of the basic units of each damping adjustment system are received in real time by the microcontroller through the signal conditioner. The master station control software analyzes the position extension and retraction of each inclined cable and the damping force of the damper. The master station controller sends a control signal to each slave station, and adjusts the control current or control voltage of each damper through feedback control. The damper that receives the control signal from the slave station adjusts the damping force and the elongation of the push rod, thereby realizing dynamic adjustment of the tower damping.

[0077] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Those skilled in the art may make some simple modifications, equivalent changes or modifications using the technical contents disclosed above, which all fall within the protection scope of the present invention.

Claims

1. A damping adjustment system for a flexible wind turbine tower, characterized in that: It includes a tower cable fixing device, a plurality of damping adjustment units and a control module, wherein: The damping adjustment unit comprises a stay cable, a tower bottom cable fixing device, a damping adjustment device and an anchoring device connected in sequence, wherein the anchoring device is used to be fixed on a foundation; The inclined cable comprises a protective sleeve and a cable body installed in the protective sleeve, and the cable body is composed of a plurality of steel wires; The cable fixing device on the tower includes a cable fixing barrel and a plurality of cable anchoring structures evenly arranged on the cable fixing barrel in the circumferential direction. The cable fixing barrel is used to be fixedly sleeved on the wind turbine tower. The two ends of each inclined cable are respectively connected to the cable anchoring structure and the cable fixing device at the bottom of the tower; the plurality of inclined cables are symmetrically distributed about the center line of the tower. Several of the damping adjustment devices are connected to a control module, and the control module jointly controls the multiple stay cables and the damping adjustment devices; The damping adjustment unit further comprises a sensor connected to the damping adjustment device, wherein the sensor is a tension pressure sensor or a displacement sensor, and the sensor is also connected to the control module, and the control module controls the damping adjustment device according to the data collected by the sensor; The damping adjustment device comprises a sleeve, a fixing bracket installed at both ends of the sleeve, an excitation coil arranged in the sleeve and a push rod connected to the excitation coil, the push rod passes through the fixing bracket at one end of the sleeve and is connected to the tower cable fixing device, and the fixing bracket at the other end of the sleeve is connected to the anchoring device; The cable anchoring structure of the cable fixing device on the tower includes a locking bolt, a cable anchoring sleeve, an anchor arranged in the cable anchoring sleeve and connected to the inclined cable in sequence, a cable clamp and a shock-absorbing ring. The cable anchoring sleeve passes through the cable fixing barrel section and is fixedly connected, and a flange is provided at the end of the cable anchoring sleeve located in the cable fixing barrel section. One end of the anchor extends out from the flange end of the cable anchoring sleeve, and the anchor is axially fixed by the locking bolt and cooperates with the flange to fix the end of the cable body.

2. The damping adjustment system for the flexible wind turbine tower according to claim 1 is characterized in that: The anchoring device comprises an anchoring plate and anchoring bolts. The anchoring plate is used to be embedded in an anchoring foundation, and the anchoring plate is connected to the damping adjustment device via the anchoring bolts.

3. The damping adjustment system for the flexible wind turbine tower according to claim 1 is characterized in that: The tower bottom cable fixing device comprises an anchor cup, a locking bolt, a cable sleeve, and a shock absorbing ring and a cable clamp arranged in the cable sleeve; one end of the cable sleeve is provided with an outward fixing flange, one end of the anchor cup is located in the cable sleeve and the other end extends from the fixing flange end of the cable sleeve and is fastened with the locking bolt; The lower end of the protective sleeve of the inclined cable passes through the shock-absorbing ring and is fixed by a cable clamp, and the cable body extends out of the lower end of the protective sleeve and passes through the annular hole of the anchor cup. The anchor cup is axially fixed by the locking bolt and the fixing flange to fix the cable body.

4. The damping adjustment system for the flexible wind turbine tower according to claim 3 is characterized in that: The other end of the cable sleeve is also provided with a rain cover, and the inclined cable passes through the rain cover and is connected to the cable sleeve; And / or, the outer end of the steel wire is also provided with a protective cover; And / or, the inner end of the anchor cup is also connected to a sealing cover, and a through hole for the steel wire to pass through is provided in the middle of the sealing cover; and / or, the anchor cup is filled with epoxy mortar to fasten the cable body; And / or, a spoke-type tension and pressure sensor is also installed on the anchor cup outside the locking bolt, and the outer end of the anchor cup is also connected to an anchor for anchoring the end of the cable body, and the tension and pressure sensor is fixed on the anchor cup in cooperation with the anchor.

5. The damping adjustment system for the flexible wind turbine tower according to claim 1, characterized in that: It also includes a protective cover connected to the flange of the cable anchoring sleeve, which is used to protect the end steel wire of the cable body; And / or, the outer periphery of the cable fixing cylinder section is further provided with an outer annular reinforcing rib; And / or, an inner annular reinforcing rib is provided in the middle of the inner wall of the cable fixing cylinder section; And / or, the inner wall of the cable fixing cylinder section is provided with a plurality of reinforcing ribs along the axial direction; And / or, the end of the cable anchoring sleeve located outside the cable fixing cylinder section is also connected to a cable protection tube, so that the inclined cable passes through the cable protection tube and enters the cable anchoring sleeve.

6. The damping adjustment system for the flexible wind turbine tower according to claim 1, characterized in that: The control module comprises a control box, a microcontroller and a signal conditioner arranged in the control box, a power supply, a switch element and control and power cables. The microcontroller is used for receiving signals and sending control instructions.

7. A wind turbine generator set, comprising a flexible wind turbine generator set tower, characterized in that: The flexible wind turbine tower is connected to the damping adjustment system of the flexible wind turbine tower according to any one of claims 1 to 6.

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