Wind generating set integrating magnetic suspension flywheel energy storage

Abstract

The invention discloses a wind generating set integrating magnetic suspension flywheel energy storage, and relates to the field of wind generating sets, the wind generating set comprises a mounting table, a motor is mounted on the mounting table, and a first clutch and a second clutch are arranged at the two ends of a rotating shaft of the motor respectively; a second reduction gearbox is connected to a rotating shaft at the end, provided with the second clutch, of the motor, an output shaft of the second reduction gearbox is connected with a transmission box, a first flywheel bin and a second flywheel bin are installed on the installation table, a rotating shaft of the first flywheel bin is connected with the third clutch, and a rotating shaft of the second flywheel bin is connected with the fourth clutch. Magnetic suspension flywheels are arranged in the first flywheel bin and the second flywheel bin. The torque of the rotating shaft of the motor is directly converted into the kinetic energy of the flywheel in the flywheel bin under the transmission of the transmission box, the energy conversion process is shortened, the generated energy which is wasted at the position of the brake is stored and then conveyed to the motor to generate power at a proper time, and the utilization efficiency of the wind power generated energy is effectively improved.

Description

Technical Field

[0001] The invention relates to the field of wind power generator sets, in particular to a wind power generator set with integrated magnetic suspension flywheel energy storage. Background Art

[0002] A wind turbine is a system that converts the kinetic energy of wind into electrical energy, including a wind rotor and a generator. The wind rotor is composed of blades, a hub, reinforcements, etc. It has functions such as the blades rotating under wind power to generate electricity and the generator head rotating.

[0003] The Chinese patent with the relevant announcement number CN112727685B discloses a wind turbine generator set with integrated magnetic levitation flywheel energy storage, including a wind turbine generator set and a magnetic levitation flywheel energy storage system; the magnetic levitation flywheel energy storage system is installed at the bottom of the tower of the wind turbine generator set; the wind turbine generator set is connected in parallel with the magnetic levitation flywheel energy storage system; the magnetic levitation flywheel energy storage system is an ultra-high-speed flywheel energy storage system using magnetic levitation bearings; the magnetic levitation flywheel energy storage system assists in maintaining the safe and stable operation of the power system; the magnetic levitation flywheel energy storage system includes a magnetic levitation Floating bearing, flywheel, high-speed permanent magnet synchronous generator, rectifier, inverter, vacuum sealed cavity and vacuum pump; there is no contact between the magnetic bearing and the flywheel, the flywheel is coaxially connected with the rotor of the high-speed permanent magnet synchronous generator, and they are installed together in the vacuum sealed cavity; the vacuum pump is connected to the vacuum sealed cavity; the three-phase output of the stator of the high-speed permanent magnet synchronous generator is connected to the AC side of the rectifier; the rectifier is connected to the DC side of the inverter through a capacitor on the DC side; the AC side of the inverter is directly connected to the AC side of the grid-side inverter of the wind turbine generator set.

[0004] The main function of the wind turbine brake is to stop or slow down the moving parts to ensure the safe operation of the wind turbine. The brake can gradually slow down the high-speed rotating wind wheel to avoid mechanical damage caused by sudden shutdown. In an emergency, the brake can quickly stop the wind wheel from rotating to ensure the safety of personnel and equipment. When the wind turbine stops running, the brake can keep the wind wheel in a stationary state to prevent accidental startup.

[0005] With respect to the above-mentioned related technologies, the existing wind turbine generator sets utilizing magnetic levitation flywheel energy storage technology use the electric energy generated by the generator to drive the electric motor to increase the speed of the flywheel and thereby realize energy storage. In the process of energy storage, the energy undergoes multiple stages of conversion, which can easily cause unnecessary losses. In addition, the wind turbine generators in the prior art often need to use brakes to slow down the main shaft when the wind speed is high. The friction deceleration of the brake can easily cause waste of power generation. In summary, the existing wind turbine generator sets with integrated magnetic levitation flywheel energy storage have the problem of not being easy to store energy efficiently. Summary of the invention

[0006] Based on this, the purpose of the present invention is to provide a wind turbine generator set with integrated magnetic levitation flywheel energy storage to solve the technical problem that the existing wind turbine generator sets with integrated magnetic levitation flywheel energy storage are difficult to store energy efficiently.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a wind turbine generator set with integrated magnetic levitation flywheel energy storage, comprising a mounting platform, a motor is mounted on the mounting platform, a first clutch and a second clutch are respectively arranged at both ends of the rotating shaft of the motor, the rotating shaft of the motor provided with the second clutch at one end is connected to a second reduction box, the output shaft of the second reduction box is connected to a transmission box, the transmission box is provided with three output shafts arranged in sequence at intervals of ninety degrees in the plane of the input shaft, the transmission box is connected to a third clutch in a direction coaxial with the input shaft, and is connected to a fourth clutch on both sides, a first flywheel compartment and a second flywheel compartment are mounted on the mounting platform, the rotating shaft of the first flywheel compartment is connected to the third clutch, the rotating shaft of the second flywheel compartment is connected to the fourth clutch, and magnetic levitation flywheels are arranged in the first flywheel compartment and the second flywheel compartment.

[0008] By adopting the above technical solution, the torque of the motor shaft is directly converted into the kinetic energy of the flywheel in the flywheel chamber under the transmission of the transmission box, thereby shortening the energy conversion process. When the wind blades need to slow down, the use of the brake can be reduced by accelerating the rotation of the flywheel. The power generation that would otherwise be wasted at the brake is stored and transmitted to the motor at the right time, thereby effectively improving the utilization efficiency of the wind power generation.

[0009] The present invention is further configured such that a mounting cylinder is connected to the bottom surface of the mounting platform, and the motor is arranged directly above the mounting cylinder.

[0010] By adopting the above technical solution, the mounting platform is connected to the wind turbine tower through the mounting cylinder, and the bottom surface of the mounting cylinder is provided with bolt through holes for connecting the wind turbine tower at intervals along the circumferential direction.

[0011] The present invention is further configured such that a brake is connected to one end of the first clutch away from the motor, and the brake is mounted on a mounting platform.

[0012] By adopting the above technical solution, the brake is used for friction braking when the wind blade needs to slow down or stop rotating. In non-emergency situations, the braking sequence of the brake is after the acceleration of the flywheel.

[0013] The present invention is further configured such that a first reduction box is coaxially mounted on the mounting platform and the brake, and a main shaft is connected to one end of the first reduction box away from the brake.

[0014] By adopting the above technical solution, the first reduction box is used to reduce the torque of the main shaft and increase the speed of the output shaft to a suitable working speed state of the motor.

[0015] The present invention is further configured such that a shell is sleeved on the mounting platform, and an end of the main shaft away from the first reduction box passes through the shell.

[0016] By adopting the above technical solution, the shell can play a role in protecting the components on the installation platform.

[0017] The present invention is further configured such that the diameter of the first flywheel chamber is greater than the diameter of the second flywheel chamber.

[0018] By adopting the above technical solution, the space in the housing is effectively utilized, and the flywheel with the axis arranged in various directions is balanced.

[0019] The present invention is further configured such that a wind vane and an anemometer are fixedly connected to the top end of the outer wall of the shell.

[0020] By adopting the above technical solution, the on-off state of each clutch in the housing is determined by measuring the wind speed of the external environment using a wind vane.

[0021] The present invention is further configured such that a transformer is mounted on one side of the motor on the mounting platform.

[0022] By adopting the above technical solution, the voltage of the motor is increased by using a transformer to reduce the power loss generated during the current transmission process.

[0023] The present invention is further configured such that a reinforcing plate is fixedly connected between the bottom surface of the mounting platform and the side wall of the mounting tube along the length direction of the mounting platform.

[0024] By adopting the above technical solution, the reinforcing plate can effectively improve the structural strength of the mounting platform and avoid excessive bending and deformation of the mounting platform due to installing too many devices.

[0025] The present invention is further configured such that a ladder is fixedly connected inside the installation cylinder along a direction parallel to the axis.

[0026] By adopting the above technical solution, the ladder allows maintenance personnel to easily climb into the shell.

[0027] In summary, the present invention mainly has the following beneficial effects:

[0028] 1. The present invention directly sets a flywheel energy storage compartment with mutually orthogonal axes in the motor compartment of the wind turbine generator, and directly converts the torque of the motor shaft into the kinetic energy of the flywheel in the flywheel compartment under the transmission of the transmission box, thereby shortening the energy conversion process. When the wind blades need to slow down, the use of the brake can be reduced by accelerating the rotation of the flywheel. After the power generation that would otherwise be wasted at the brake is stored, it is transmitted to the motor for power generation at an appropriate time, thereby effectively improving the utilization efficiency of the wind power generation;

[0029] 2. The present invention uses a magnetic suspension flywheel energy storage bin and adopts magnetic field force to control the rotating object. There is no mechanical contact between the rotor and the stator, so there is no heat, wear and dust caused by friction, which can reduce energy loss and maintenance costs. Due to the lack of friction, the mechanical efficiency of the axial magnetic suspension flywheel is high, which can improve the operating efficiency of the overall system, reduce wear, and thus extend the service life of the flywheel;

[0030] 3. The present invention effectively improves the stability of the wind turbine generator compartment by utilizing the angular momentum conservation phenomenon generated when the flywheels in multiple groups of flywheel compartments with mutually orthogonal axes rotate at high speed. In a strong airflow environment, the stability of the wind turbine generator compartment can be further improved by increasing the rotation speed of each flywheel in the flywheel compartment;

[0031] 4. The present invention controls the torque transmitted from the motor to the flywheel through the transmission box and the clutch at the rotating shaft of each flywheel compartment. When the flywheel starts to accelerate from a low speed or a stationary state, the torque of the motor shaft can be used to accelerate the flywheels one by one, thereby avoiding the current overload caused by the motor accelerating the slowly rotating flywheel. Similarly, when the flywheel speed is not high, the torque output of multiple flywheel compartments can be used to drive the rotating shaft of the motor to rotate, so as to maintain the motor at an economical speed condition. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A perspective view of the present invention;

[0033] Figure 2 It is a cross-sectional perspective view of the shell of the present invention;

[0034] Figure 3 It is a cross-sectional perspective view of the shell of another viewing angle of the present invention;

[0035] Figure 4 It is a three-dimensional diagram of the internal structure of the present invention;

[0036] Figure 5 For the present invention Figure 4 A magnified view of middle;

[0037] Figure 6 It is a schematic diagram of the internal structure of the transmission box of the present invention.

[0038] In the figure: 1. mounting table; 2. main shaft; 3. first reduction box; 4. brake; 5. motor; 6. transformer; 7. second reduction box; 8. transmission box; 9. first flywheel compartment; 10. second flywheel compartment; 11. first clutch; 12. second clutch; 13. third clutch; 14. fourth clutch; 15. housing; 16. mounting tube; 17. reinforcing plate; 18. weather vane; 19. anemometer; 20. ladder. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0040] The following describes an embodiment of the present invention based on its overall structure.

[0041] Embodiment 1

[0042] A wind turbine generator set with integrated magnetic levitation flywheel energy storage, such as Figure 1-6 As shown, it includes a mounting platform 1, on which a motor 5 is mounted. The motor 5 is specifically a generator. The difference from the prior art is that the motor shaft is connected to a second clutch after being transmitted out of the housing of the motor 5 in the direction away from the first clutch 11. When the first clutch 11 and the second clutch 12 are simultaneously engaged, the main shaft 2 can directly transmit mechanical energy to each flywheel through a mechanical structure along the axis direction of the motor 5, so that the mechanical energy is directly converted into the kinetic energy of the flywheel, shortening the multi-stage energy conversion of mechanical energy into electrical energy, then into mechanical energy, and finally into kinetic energy in the prior art, as well as various losses that may be generated during the transmission of electrical energy, effectively improving the utilization efficiency of wind energy. The first clutch 11 and the second clutch 12 are respectively arranged at both ends of the motor shaft. The rotating shaft provided with the second clutch 12 at one end is connected with the second reduction box 7, the output shaft of the second reduction box 7 is connected with the transmission box 8, the transmission box 8 is provided with three output shafts in sequence at intervals of ninety degrees in the plane of the input shaft, the transmission box 8 is connected with the third clutch 13 in the direction coaxial with the input shaft, and is connected with the fourth clutch 14 on both sides, the first flywheel chamber 9 and the second flywheel chamber 10 are installed on the mounting platform 1, the rotating shaft of the first flywheel chamber 9 is connected with the third clutch 13, the rotating shaft of the second flywheel chamber 10 is connected with the fourth clutch 14, the first flywheel chamber 9 and the second flywheel chamber 10 are provided with magnetic suspension flywheels, and a transformer 6 is installed on one side of the motor 5 on the mounting platform 1, and the transformer 6 is used to increase the voltage of the motor 5 to reduce the power loss generated during the current transmission process.

[0043] See also Figure 2-4The bottom surface of the mounting platform 1 is connected with a mounting cylinder 16, and the motor 5 is arranged just above the mounting cylinder 16. Specifically, the motor 5 is installed just above the opening of the mounting cylinder 16 through a mounting bracket, and a sufficient space is maintained from the mounting platform 1 for workers to pass through, so as to avoid workers accidentally touching the motor 5 and getting hurt when repairing the wind turbine. The mounting platform 1 is connected to the wind turbine tower through the mounting cylinder 16, and the bottom surface of the mounting cylinder 16 is provided with bolt through holes for connecting the wind turbine tower at intervals along the annular direction. Specifically, in other embodiments, a yaw controller can also be installed in the mounting cylinder 16 to control the direction of the wind blades. The yaw controller itself has not been improved. This is not elaborated herein. The end of the first clutch 11 away from the motor 5 is connected to a brake 4. Specifically, the brake 4 uses friction braking to brake the main shaft 2. In severe weather or when the wind turbine needs to be repaired, the brake 4 is used to hold the wind blades in a stationary state. The brake 4 is mounted on the mounting platform 1. The brake 4 is used for friction braking when the wind blades need to slow down or stop rotating. In non-emergency situations, the braking sequence of the brake 4 is after the flywheel is accelerated. Specifically, the residual kinetic energy of the wind blades during rotation is first transferred to the flywheel and converted into the kinetic energy of the flywheel. When the flywheel can no longer be accelerated, the brake 4 is used for braking.

[0044] See also Figure 2-5 The mounting platform 1 is coaxially mounted with a first reduction gearbox 3 and the brake 4. Specifically, the reduction ratio of the first reduction gearbox 3 is one to one hundred, which is used to reduce the torque of the low-speed rotating main shaft 2 and increase the speed to adapt to the optimal working speed range of the motor 5. The first reduction gearbox 3 is connected to the main shaft 2 at one end away from the brake 4. The first reduction gearbox 3 is used to reduce the torque of the main shaft 2 and increase the speed of the output shaft to a suitable working speed state for the motor 5. A shell 15 is sleeved on the mounting platform 1. Specifically, the shell 15 is provided with a raised space for matching the second flywheel compartment 10 at the position of the second flywheel compartment 10, so as to better accommodate the second flywheel compartment 10, and the outer wall of the shell 15 is also provided with an arc surface at the corresponding position of the second flywheel compartment 10, so as to reduce the wind resistance of the outer wall of the shell 15. The end of the main shaft 2 away from the first reduction gearbox 3 passes through the shell 15, and the shell 15 can protect the components on the mounting platform 1.

[0045] Embodiment 2

[0046] A wind turbine generator set with integrated magnetic levitation flywheel energy storage, such as Figure 1-6As shown, on the basis of Example 1, the difference from Example 1 is that the diameter of the first flywheel compartment 9 is larger than the diameter of the second flywheel compartment 10, the space in the shell 15 is effectively utilized, and the flywheels arranged along the balance axis in various directions, specifically, the tail space of the mounting platform 1 has a large installation space along the axial direction of the motor 5, and the second flywheel compartment 10 with a larger size is suitable for installing in this installation space, so as to obtain more kinetic energy storage capacity. At the same time, while each flywheel keeps rotating, the angular momentum conservation phenomenon of each flywheel is effectively utilized to maintain the stability of the mounting platform 1, thereby alleviating the shaking of the shell 15 caused by the horizontal wind in strong airflow weather.

[0047] Embodiment 3

[0048] A wind turbine generator set with integrated magnetic levitation flywheel energy storage, such as Figure 1-6 As shown, on the basis of embodiment one, the difference from embodiment one is that a wind vane 18 and an anemometer 19 are fixedly connected to the top of the outer wall of the shell 15. Specifically, the wind vane 18 is used to determine the wind direction of the external airflow, provide yaw rotation angle data for the yaw controller of the wind turbine tower, and use the wind vane 18 to measure the wind speed of the external environment to determine the on and off state of each clutch in the shell 15. Specifically, the anemometer 19 measures the wind speed of the external environment and provides the brake 4 with data on whether braking is required and whether the third clutch 13 and the fourth clutch 14 need to be engaged.

[0049] Embodiment 4

[0050] A wind turbine generator set with integrated magnetic levitation flywheel energy storage, such as Figure 1-6 As shown, on the basis of Example 1, the difference from Example 1 is that a reinforcing plate 17 is fixedly connected between the bottom surface of the mounting platform 1 and the side wall of the mounting cylinder 16 along the length direction of the mounting platform 1, and the reinforcing plate 17 can effectively improve the structural strength of the mounting platform 1. Specifically, two reinforcing plates 17 are provided on the mounting cylinder 16 along the width direction of the mounting platform 1 in parallel with each other, and two are also provided along the same straight line in the length direction of the mounting platform 1, so as to avoid excessive bending deformation of the mounting platform 1 due to the installation of too many devices, and improve the structural strength of the mounting platform 1. A ladder 20 is fixedly connected in the mounting cylinder 16 in a direction parallel to the axis, and the ladder 20 allows maintenance personnel to easily climb into the shell 15.

[0051] The working principle of the present invention is as follows: when the rotation speed of the main shaft 2 is too high and needs to be decelerated, the second clutch 12 is engaged, and the motor 5 transmits torque to the second reduction box 7 to rotate the output shaft of the second reduction box 7. The engagement state of the third clutch 13 and the fourth clutch 14 is determined according to the wind speed measured by the anemometer 19 installed outside the housing 15. When the external wind speed exceeds the appropriate wind speed of wind power generation by a small amount, the additional torque input to the main shaft is similarly small. Under the premise that the brake 4 is not working, one of the third clutches 13 is engaged and transmitted to the flywheel in the second flywheel compartment 10 through the transmission box 8, so that the flywheel accelerates and accumulates kinetic energy. When the external wind speed exceeds the appropriate wind speed of wind power generation by a large amount, the additional torque input to the main shaft 2 is similarly large. Under the premise that the brake 4 is not working, two third clutches 13 and one fourth clutch 14 are engaged at the same time, and the transmission box 8 is used to transmit the three flywheels to accelerate and accumulate kinetic energy at the same time. When the rotation speed of the motor 5 is still too high in the state of energy storage of the three flywheels, the brake 4 can be used for braking and deceleration.

[0052] When the wind turbine needs to be repaired or maintained or encounters an emergency, the wind turbine blades need to stop rotating. In non-emergency situations, the brake 4 does not brake first, and the transmission box 8 and the second reduction box 7 are used to convert the torque of the main shaft 2 into the kinetic energy of the three flywheels, and gradually reduce the speed of the main shaft 2 until the speed of the main shaft 2 is too low to continue to accelerate the flywheel. Then, the brake 4 can be used to brake the main shaft 2;

[0053] When the main shaft 2 is stopped, the first clutch 11 is disengaged, while the second clutch 12 remains engaged, and the two third clutches 13 and the fourth clutch 14 are engaged in sequence, converting the kinetic energy of the flywheel into mechanical energy so that the rotor of the motor 5 rotates to generate electricity. After the kinetic energy of the flywheels in the first flywheel chamber 9 and the second flywheel chamber 10 is released and the rotation speed is gradually reduced, the two third clutches 13 or a third clutch 13 and a fourth clutch 14 can be engaged at the same time, and the kinetic energy of the two flywheels is used to output torque to the second reduction box 7. When the kinetic energy of the flywheels in the first flywheel chamber 9 and the second flywheel chamber 10 is further released and the rotation speed is further reduced, the two third clutches 13 and the fourth clutch 14 are engaged at the same time, and the kinetic energy of the three flywheels is used to output torque to the second reduction box 7, so as to maintain the motor 5 always in a more suitable power generation speed range.

[0054] Although an embodiment of the present invention has been shown and described, this specific embodiment is only an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A wind turbine generator set with integrated magnetic suspension flywheel energy storage, comprising a mounting platform (1), on which a motor (5) is mounted, characterized in that: A first clutch (11) and a second clutch (12) are respectively arranged at both ends of the rotating shaft of the motor (5); the rotating shaft of one end of the motor (5) provided with the second clutch (12) is connected to a second reduction box (7); the output shaft of the second reduction box (7) is connected to a transmission box (8); the transmission box (8) is provided with three output shafts arranged in sequence at intervals of ninety degrees in the plane of the input shaft; the transmission box (8) is connected to a third clutch (13) in a direction coaxial with the input shaft, and is connected to a fourth clutch (14) on both sides; a first flywheel chamber (9) and a second flywheel chamber (10) are installed on the mounting platform (1); the rotating shaft of the first flywheel chamber (9) is connected to the third clutch (13); the rotating shaft of the second flywheel chamber (10) is connected to the fourth clutch (14); and magnetic suspension flywheels are arranged in the first flywheel chamber (9) and the second flywheel chamber (10).

2. The wind turbine generator set with integrated magnetic levitation flywheel energy storage according to claim 1 is characterized in that: The bottom surface of the mounting platform (1) is connected to a mounting cylinder (16), and the motor (5) is arranged directly above the mounting cylinder (16).

3. The wind turbine generator set with integrated magnetic levitation flywheel energy storage according to claim 2 is characterized in that: The end of the first clutch (11) away from the motor (5) is connected to a brake (4), and the brake (4) is mounted on a mounting platform (1).

4. The wind turbine generator set with integrated magnetic levitation flywheel energy storage according to claim 3 is characterized in that: The mounting platform (1) and the brake (4) are coaxially mounted with a first reduction box (3); an end of the first reduction box (3) away from the brake (4) is connected to a main shaft (2).

5. The wind turbine generator set with integrated magnetic levitation flywheel energy storage according to claim 4 is characterized in that: A shell (15) is sleeved on the mounting platform (1), and one end of the main shaft (2) away from the first reduction box (3) passes through the shell (15).

6. The wind turbine generator set with integrated magnetic levitation flywheel energy storage according to claim 1, characterized in that: The diameter of the first flywheel chamber (9) is greater than the diameter of the second flywheel chamber (10).

7. The wind turbine generator set with integrated magnetic levitation flywheel energy storage according to claim 5 is characterized in that: A wind vane (18) and an anemometer (19) are fixedly connected to the top end of the outer wall of the housing (15).

8. The wind turbine generator set with integrated magnetic levitation flywheel energy storage according to claim 1, characterized in that: A transformer (6) is installed on the installation platform (1) at one side of the motor (5).

9. The wind turbine generator set with integrated magnetic levitation flywheel energy storage according to claim 2, characterized in that: A reinforcing plate (17) is fixedly connected between the bottom surface of the mounting platform (1) and the side wall of the mounting tube (16) along the length direction of the mounting platform (1).

10. The wind turbine generator set with integrated magnetic levitation flywheel energy storage according to claim 2, characterized in that: A ladder (20) is fixedly connected inside the installation cylinder (16) in a direction parallel to the axis.

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