Multifunctional flywheel energy storage device

Abstract

The utility model discloses a multifunctional flywheel energy storage device, which is characterized in that a flywheel is in transmission connection with a generator motor, the flywheel is in transmission connection with a synchronous phase modifier, and a clutch is arranged between the flywheel and the synchronous phase modifier, so that the generator motor is assisted by a power electronic device to carry out mutual conversion between kinetic energy and electric energy; the flywheel can achieve the mainstream flywheel energy storage function of energy charging and energy releasing through the combination of the generator motor, and the flywheel can be combined with the synchronous phase modifier to provide direct rotational inertia for a power grid when the flywheel is in standby for the longest time generally.

Description

Technical Field

[0001] The utility model belongs to the field of flywheel energy storage devices and phase regulators, and in particular relates to a multifunctional flywheel energy storage device. Background Art

[0002] The access of new energy to the grid has large fluctuations and lacks the rotational inertia of traditional thermal power. In order to solve the shortcomings of the access of new energy to the grid, flywheel energy storage is needed to adjust the fluctuations of new energy and increase the rotational inertia in the grid. In addition, the grid also needs phase regulators as reactive power compensation equipment.

[0003] The current mainstream flywheel energy storage technology is to use power electronics to assist the generator-motor integrated machine to connect with the flywheel transmission to convert kinetic energy and electrical energy. Disadvantages: First, since the power electronics have no rotational inertia, it is difficult to participate in the grid inertia response. Secondly, since the flywheel is only used for energy storage and release, the flywheel cannot be used during the standby period. Finally, because the flywheel needs to be charged and released through variable speed, it cannot be used by synchronous phase regulators.

[0004] Patent CN 216016619U, asynchronous power generation flywheel energy storage system, this system separates the motor and generator functions, does not use power electronics to assist the generator-motor integrated machine to convert kinetic energy and electrical energy, but uses an independent motor to drive the flywheel to store energy, and then uses an independent asynchronous generator to release energy, so it can provide rotational inertia for the power grid.

[0005] Disadvantages: First, the independent motor and independent generator increase the cost. Second, in the three states of flywheel energy storage, energy release, and standby, it only provides rotational inertia for the power grid in the energy release stage. However, the standby state, which is the longest operating time of the general flywheel, cannot provide rotational inertia for the power grid because the flywheel basically rotates at a uniform speed. Third, like mainstream flywheel energy storage, the flywheel cannot be used during the standby period. Finally, because the flywheel needs to charge and release energy through variable speed, it cannot be used by synchronous phase regulators.

[0006] Existing synchronous condensers with flywheels provide direct rotational inertia for the power grid while providing phase adjustment for the power grid. The flywheel connected by the transmission is used to increase the rotational inertia. The transmission device has a hydraulic coupling or a gear device. Disadvantages: The flywheel of the synchronous condenser with a flywheel is relatively small and provides limited rotational inertia. Since it basically rotates at a uniform speed, it cannot provide the charging and releasing functions of the flywheel energy storage device. In this way, the flywheel is only used to increase the rotational inertia, which wastes the flywheel energy storage resources.

[0007] Finally, since independent flywheel energy storage and independent synchronous condenser each require a very expensive flywheel device, purchasing flywheel energy storage and synchronous condenser separately increases the cost. Moreover, it is impossible to realize the linkage between one synchronous condenser and multiple flywheels, and it is impossible to maximize the use of flywheels, which also increases the cost. Utility Model Content

[0008] (1) Technical problem to be solved: In view of the defects in the prior art that the flywheel energy storage device and the synchronous phase condenser are independent of each other, the flywheel cannot be maximized, and the cost is high, the utility model provides a multifunctional flywheel energy storage device that can link the flywheel energy storage device and the synchronous phase condenser to share a flywheel.

[0009] (2) The technical solution adopted by the utility model is as follows:

[0010] A multifunctional flywheel energy storage device comprises a frame, a flywheel is rotatably connected to the frame, the flywheel is transmission-connected to a generator motor, the flywheel is transmission-connected to a synchronous condenser, and a first clutch is transmission-connected between the flywheel and the synchronous condenser.

[0011] A further technical solution is that a first hydraulic torque converter or a first hydraulic coupling and a first transmission are transmission-connected between the flywheel and the synchronous condenser.

[0012] A further technical solution is that the flywheel, the generator motor and the synchronous condenser are coaxial and arranged horizontally.

[0013] A further technical solution is that the flywheel is an air cushion flywheel.

[0014] A further technical solution is that the flywheel is connected to the generator motor through a first transmission shaft, a first bevel gear is provided on the first transmission shaft, the first bevel gear is transmission-connected to the second bevel gear, the second bevel gear is connected to the first clutch, the first hydraulic coupling or the first hydraulic torque converter, the first transmission and the synchronous phase condenser through the second transmission shaft, and the second transmission shaft is rotationally connected to the frame.

[0015] A further technical solution is that a first additional air cushion flywheel and a second additional air cushion flywheel are respectively arranged on both sides of the second transmission shaft, a common generator motor is arranged between the two additional air cushion flywheels, a third bevel gear is arranged on the power shaft of the common generator motor, a fourth bevel gear is arranged on the second transmission shaft, the first additional air cushion flywheel is coaxially connected to the third transmission shaft, the third transmission shaft and the third bevel gear are connected through the first transmission assembly, the third transmission shaft and the fourth bevel gear are connected through the second transmission assembly, the second additional air cushion flywheel is coaxially connected to the fourth transmission shaft, the fourth transmission shaft and the third bevel gear are connected through the third transmission assembly, and the fourth transmission shaft and the fourth bevel gear are connected through the fourth transmission assembly.

[0016] A further technical solution is that the first transmission assembly, the second transmission assembly, the third transmission assembly and the fourth transmission assembly have the same structure and include: a main shaft, a second clutch, a second hydraulic coupling, a second transmission, a third clutch and three bevel gears.

[0017] A further technical solution is that the synchronous condenser is arranged vertically, the second transmission shaft is connected to the synchronous condenser through a fifth bevel gear and a sixth bevel gear, and the combination of the flywheel and the generator motor includes multiple ones.

[0018] A further technical solution is that a fourth clutch is arranged on the second transmission shaft.

[0019] A further technical solution is that the flywheel, the generator motor and the synchronous condenser are coaxial and arranged vertically.

[0020] (3) Due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0021] 1. The system uses only traditional integrated generator-motor units and synchronous condensers, providing the most functions for the power grid with the least equipment.

[0022] 2. The system can provide direct rotational inertia for the power grid.

[0023] 3. Provide the maximum rotational inertia while retaining the flywheel energy storage and release functions. First, the standby state, which is the longest operating time of the general flywheel, can provide rotational inertia for the power grid. Second, when a phase regulator is connected to multiple flywheel transmissions, it can also provide rotational inertia for the power grid through coordination.

[0024] 4. The flywheel can be fully utilized and can provide the power grid with flywheel energy storage and release functions when the flywheel changes speed. In the standby state where the flywheel rotates at a basically uniform speed, the flywheel can provide direct rotational inertia for the power grid.

[0025] 5. Since the flywheel and the phase regulator share a common flywheel, the cost of one flywheel is saved, thus greatly reducing the cost compared to purchasing independent flywheel energy storage and independent phase regulation separately.

[0026] 6. The flywheel is connected to the generator motor through transmission, and the flywheel is connected to the synchronous condenser through transmission, and a clutch is provided between the flywheel and the synchronous condenser. In this way, the power electronic device assists the generator motor in the mutual conversion between kinetic energy and electrical energy, and the flywheel can realize the mainstream flywheel energy storage function of charging and releasing energy through the generator motor combination. During the longest standby time, the flywheel can also be combined with the synchronous condenser to provide direct rotational inertia for the power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1It is a structural schematic diagram corresponding to Embodiment 1 of the present utility model;

[0028] Figure 2 It is a structural schematic diagram corresponding to Embodiment 2 of the present utility model;

[0029] Figure 3 is a schematic diagram of the distribution of multiple flywheels corresponding to Embodiment 3 of the present utility model;

[0030] Figure 4 It is a schematic diagram of the connection between the flywheel, the phase regulator and the generator engine corresponding to the third embodiment of the utility model;

[0031] Figure 5 It is a schematic diagram of the connection between the first additional air cushion flywheel and the second additional air cushion flywheel and the power generation engine corresponding to the third embodiment of the utility model;

[0032] Figure 6 It is a structural schematic diagram corresponding to Embodiment 4 of the present utility model;

[0033] Figure 7 It is a schematic diagram of the distribution of multiple flywheels corresponding to Embodiment 5 of the present utility model;

[0034] Figure 8 This is a schematic diagram of the connection between the flywheel, the phase regulator and the generator engine corresponding to Embodiment 5 of the present utility model;

[0035] Fig. 9 It is a schematic diagram of the utility model in which only the first clutch is installed between the flywheel and the synchronous condenser;

[0036] Fig.10 It is a schematic diagram of adding a universal transmission shaft to achieve connection when the flywheel and the synchronous condenser are not coaxial. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0038] like Figure 1-Figure 10 shown.

[0039] Embodiment 1: A multifunctional flywheel energy storage device comprises a frame 1, a flywheel 2 is rotatably connected to the frame 1, the flywheel 2 is transmission-connected to a generator motor 3, the flywheel 2 is transmission-connected to a synchronous condenser 4, and a first clutch 5, a first hydraulic coupling 6 or a hydraulic torque converter, and a first transmission 7 are transmission-connected between the flywheel 2 and the synchronous condenser 4. The flywheel 2, the generator motor 3 and the synchronous condenser 4 are coaxial and arranged horizontally. The generator motor 3 in the utility model is also called an electric / generator in a general flywheel energy storage device, and is an integrated generator motor assisted by a power electronic device. It can be used as both a generator and a motor.

[0040] When in use, the first clutch 5 is started to disengage, and the generator motor 3 drives the flywheel 2 to rotate from a stationary state to a low speed waiting for energy storage, that is, the flywheel 2 enters a standby state in which the flywheel 2 maintains a basically uniform rotation, and then the first transmission 7 is adjusted to a gear position that matches the flywheel 2 and the synchronous condenser 4, and then the first clutch 5 is engaged, and the first hydraulic coupling 6 or the hydraulic torque converter plays a buffering role. In this way, during the waiting stage, the flywheel 2 rotating at a basically uniform speed can provide the synchronous condenser 4 with a rotational inertia.

[0041] When energy storage is required, the first clutch 5 is disengaged. Like a general flywheel 2 energy storage device, the electric energy is converted by the power converter to drive the generator motor 3 to operate. The generator motor 3 drives the flywheel 2 to accelerate. The flywheel 2 stores the energy in the form of kinetic energy. After reaching the maximum speed for energy storage, the energy storage process of converting electric energy into mechanical energy is completed, and the energy is stored in the high-speed rotating flywheel 2 body.

[0042] After the flywheel 2 reaches the maximum speed, it enters the standby state where the flywheel 2 keeps rotating at a substantially uniform speed, and the flywheel 2 keeps the stored energy. Then the first transmission 7 is adjusted to the gear position that matches the flywheel 2 and the synchronous condenser 4, and then the first clutch 5 is engaged, and the hydraulic coupling 6 or the hydraulic torque converter plays a buffering role. In this way, when the flywheel 2 keeps rotating at a uniform speed with stored energy, the flywheel 2 can provide direct rotational inertia for the synchronous condenser 4.

[0043] When energy release and discharge are required, the flywheel 2 drags the generator motor 3 to generate electricity, and the flywheel 2 continuously reduces its rotation speed. Like a general flywheel 2 energy storage device, the electricity generated by the generator motor 3 is output through the power converter to output the current and voltage suitable for the load, completing the energy release process of converting mechanical energy into electrical energy.

[0044] In special cases, when the flywheel 2 is storing and releasing energy, the power grid suddenly needs rotational inertia. The first transmission 7 is adjusted to a matching gear according to the current speed of the flywheel 2, and the generator motor 3 also adjusts the speed of the flywheel 2 at the same time. Then the first clutch 5 is engaged to temporarily synchronize the speed of the flywheel 2 with the phase shifter to provide rotational inertia support for the power grid.

[0045] Embodiment 2: The difference from the embodiment is that the flywheel 2 and the generator motor 3 are vertically arranged as a whole, while the synchronous phase condenser 4 is horizontally arranged, and the flywheel 2 is an air cushion flywheel 2, and the air cushion flywheel 2 and the generator motor 3 are connected through a first transmission shaft 8, and a first bevel gear 9 is arranged on the first transmission shaft 8, and the first bevel gear 9 is transmission-connected to the second bevel gear 10, and the second bevel gear 10 is connected to the first clutch 5, the first hydraulic coupling 6 or the hydraulic torque converter, the first transmission 7 and the synchronous phase condenser 4 through the second transmission shaft 11, and the second transmission shaft 11 is rotationally connected to the frame 1.

[0046] The principle of use is the same as that in Example 1. The advantage of this solution is that a large number of vertical flywheels 2 can be used to drive and connect with the horizontal synchronous condenser 4. The vertical flywheel 2 is provided with air cushions and other devices at the bottom, and the air cushions and other devices are the same as those in ZL 2024 21788504.X "An air cushion support rotor device with radial bearings located above the air cushion chamber". The air cushion flywheel 2 with an air cushion device at the bottom is provided with a generator motor 3 above. The air cushion flywheel 2 is connected with the synchronous condenser 4 in drive, and the flywheel is connected with the synchronous condenser 4 in drive after passing through the clutch, hydraulic coupling, and transmission. The synchronous condenser 4 here is the synchronous condenser 4 of the horizontal synchronous condenser 4.

[0047] Embodiment 3: Based on Embodiment 2, a first additional air cushion flywheel 12 and a second additional air cushion flywheel 13 are respectively arranged on both sides of the second transmission shaft 11, a common generator motor 14 is arranged between the two additional air cushion flywheels 2, a third bevel gear 17 is arranged on the power shaft of the common generator motor 14, a fourth bevel gear 16 is arranged on the second transmission shaft 11, the first additional air cushion flywheel 12 is coaxially connected to the third transmission shaft 18, the third transmission shaft 18 and the third bevel gear 17 are connected through a first transmission assembly 19, the third transmission shaft 18 and the fourth bevel gear 16 are connected through a second transmission assembly 20, the second additional air cushion flywheel 13 is coaxially connected to The fourth transmission shaft 21 is connected to the third bevel gear 17 through the third transmission assembly 22, and the fourth transmission shaft 21 is connected to the fourth bevel gear 16 through the fourth transmission assembly 23. The first transmission assembly 19, the second transmission assembly 20, the third transmission assembly 22 and the fourth transmission assembly 23 have the same structure and include: a main shaft 24, a second clutch 25, a second hydraulic coupling 26 or a second hydraulic torque converter, a second transmission 27, a third clutch 31 and three bevel gears 28. The second clutch 25 is used to cut off power transmission, the second hydraulic coupling 26 or the second hydraulic torque converter is used for buffering, and the second transmission 27 is used for speed regulation. The third clutch 31 is arranged behind the second transmission 27 on the main shaft 24. The function of this clutch is to completely cut off the connection with the transmission, so as to save energy. Because it is connected to the second transmission 27, even if the idle gear wastes energy, so in this scheme, when a phase regulator is connected to multiple flywheels, more energy can be saved. The fourth clutch 32 is arranged behind the first transmission 7 on the second transmission shaft 11. The fourth clutch 32 has the same function as the third clutch 31 .

[0048] The third transmission shaft 18 is connected to the third bevel gear 17 through the first transmission assembly 19. At this time, the first bevel gear in the first transmission assembly 19 is coaxially fixed with the third transmission shaft 18, and the second bevel gear is arranged on the main shaft 24. The main shaft 24 is transmission-connected to the second clutch 25, the second hydraulic coupling 26 or the second hydraulic torque converter, the second transmission 27 and the third bevel gear, and the third bevel gear is transmission-connected to the third bevel gear 17.

[0049] The third transmission shaft 18 is connected to the fourth bevel gear 16 through the second transmission assembly 20. At this time, the first bevel gear in the second transmission assembly 20 is coaxially fixed with the third transmission shaft 18, and the second bevel gear is arranged on the main shaft 24. The main shaft 24 is transmission-connected to the second clutch 25, the second hydraulic coupling 26 or the second hydraulic torque converter, the second transmission 27 and the third bevel gear. The third bevel gear is transmission-connected to the fourth bevel gear 16.

[0050] The fourth transmission shaft 21 is connected to the third bevel gear 17 through the third transmission assembly 22. At this time, the first bevel gear of the third transmission assembly 22 is coaxially fixed with the fourth transmission shaft 21, and the second bevel gear is arranged on the main shaft 24. The main shaft 24 is transmission-connected to the second clutch 25, the second hydraulic coupling 26 or the second hydraulic torque converter, the second transmission 27 and the third bevel gear. The third bevel gear is transmission-connected to the third bevel gear 17.

[0051] The fourth transmission shaft 21 and the fourth bevel gear 16 are connected through the fourth transmission assembly 23. At this time, the first bevel gear of the fourth transmission assembly 23 is coaxially fixed with the fourth transmission shaft 21, and the second bevel gear is arranged on the main shaft 24. The main shaft 24 is transmission-connected to the second clutch 25, the second hydraulic coupling 26 or the second hydraulic torque converter, the second transmission 27 and the third bevel gear. The third bevel gear is transmission-connected to the fourth bevel gear 16.

[0052] This solution is that a horizontal synchronous condenser 4 can be connected to multiple vertical flywheels 2 in a transmission manner, so that a synchronous condenser 4 supports multiple flywheels 2, which greatly increases the moment of inertia.

[0053] When in use, the first additional air-cushion flywheel 12 and the second additional air-cushion flywheel 13 share a generator motor. Since the shared generator motor 14 drives the first additional air-cushion flywheel 12 and the second additional air-cushion flywheel 13, two strategies can be adopted.

[0054] Strategy 1: The second clutch 25 and the second transmission 27 corresponding to the first additional air cushion flywheel 12 and the second additional air cushion flywheel 13 are respectively actuated, and the common generator motor 14 drives the first additional air cushion flywheel 12 and the second additional air cushion flywheel 13 to rotate in turn, respectively controlling the states of the first additional air cushion flywheel 12 and the second additional air cushion flywheel 13. In this solution, the clutch and transmission of each flywheel 2 connected to the synchronous condenser 4 are also actuated separately, and the two flywheels have different rotation speeds, so the flexibility is high.

[0055] Strategy 2: The second clutch 25 and the second transmission 27 corresponding to the first additional air cushion flywheel 12 and the second additional air cushion flywheel 13 are actuated simultaneously, and the common generator motor 14 drives the first additional air cushion flywheel 12 and the second additional air cushion flywheel 13 to rotate simultaneously. In this solution, the clutch and transmission of each flywheel 2 connected to the synchronous condenser 4 are actuated simultaneously, and although the flywheel speed changes slowly, the control is simple.

[0056] The usage of the flywheel 2 and the generator motor 3 is the same as in the second embodiment.

[0057] The transmission connection between the synchronous condenser 4 and the flywheel 2, the first additional air cushion flywheel 12 and the second additional air cushion flywheel 13 has the following advantages. The three flywheels 2 can provide a larger moment of inertia for the synchronous condenser 4. A more flexible strategy can be adopted, such as charging and releasing energy of the flywheel 2, the first additional air cushion flywheel 12 and the second additional air cushion flywheel 13 in turn, so that at least one flywheel 2 can always provide moment of inertia for the synchronous condenser 4.

[0058] In actual use, three flywheels 2 can also be arranged on the other side of the synchronous condenser 4, so that the synchronous condenser 4 is transmission-connected with six flywheels 2, which further increases the moment of inertia of the synchronous condenser 4.

[0059] Embodiment 4: The flywheel 2, the generator motor 3 and the synchronous condenser 4 are coaxial and vertically arranged, and the flywheel 2 is a magnetic levitation flywheel 2. In this solution, the small flywheel 2 and the small vertical synchronous condenser 4 are integrated, which is suitable for small new energy power plants.

[0060] The flywheel 2 is supported by permanent magnets. Permanent magnets are arranged on the upper part of the flywheel 2 and the outer shell of the outer wheel, and the permanent magnets attract each other, providing an upward force for the flywheel 2; permanent magnets are also arranged on the lower part of the flywheel 2 in the shell and the outer shell, and the lower permanent magnets repel each other, providing an upward force for the flywheel 2.

[0061] The upper part of the flywheel 2 shaft is connected to the generator motor 3, and the lower part of the flywheel 2 is connected to the synchronous condenser 4, and is connected to the synchronous condenser 4 after passing through the first clutch 5, the first hydraulic torque converter or the first hydraulic coupling 6, and the first transmission 7. The synchronous condenser 4 is a vertical synchronous condenser 4.

[0062] Embodiment 5: Based on Embodiment 2 and Embodiment 4, the synchronous condenser 4 is arranged vertically, the second transmission shaft 11 is connected to the synchronous condenser 4 through the fifth bevel gear 29 and the sixth bevel gear 30, and the combination of the flywheel 2 and the generator motor 3 includes multiple ones.

[0063] There are eight flywheels 2 supported by permanent magnets in the housing, and the upper parts of the eight flywheels 2 are transmission-connected to the generator motor 3. The difference from implementation 4 is that the flywheel 2 uses radial bearings and thrust bearings, and the permanent magnets and thrust bearings jointly support the flywheel.

[0064] In this solution, eight small flywheels 2 are integrated with the large vertical synchronous condenser 4, so that more flywheels 2 can provide rotational inertia for the synchronous condenser 4.

[0065] A vertical synchronous condenser 4 is arranged on the ground between the eight flywheels 2. The eight flywheels 2 are connected to the synchronous condenser 4 through bevel gears, and the flywheels 2 are connected to the synchronous condenser 4 through the first clutch 5, the first hydraulic coupler 6 or the hydraulic torque converter, and the first transmission 7. Since the synchronous condenser 4 is connected to the plurality of flywheels 2, there is a fourth clutch 32 after the first transmission 7, so that the separation of the fourth clutch 32 can reduce the loss caused by the first transmission 7. The synchronous condenser 4 here is a vertical synchronous condenser 4.

[0066] When used, the strategy is the same as that of the synchronous condenser 4 in the third embodiment, which is separately connected to the flywheel 2. As a minority application, especially when one synchronous condenser 4 is connected to multiple flywheels 2, in this solution, when the flywheel 2 rotates at a constant speed, multiple generator motors 3 drive multiple flywheels 2, and multiple flywheels 2 drive synchronous generators to supply electricity to the grid, which is equivalent to new energy supplying electricity to the grid through synchronous generators. In this solution, rotational inertia can also be provided for the grid.

[0067] The present invention can also provide support for primary frequency regulation and secondary frequency regulation. In this case, the synchronous phase regulator 4 temporarily acts as a generator, cooperates with the first clutch 5 and the first transmission 7 to quickly operate, and adds the generator motor 3 to quickly release all the energy stored in the flywheel 2 to ensure the stability of the power grid.

[0068] Ginseng Fig. 9 In actual applications, as a minority of applications, only the first clutch 5 can be installed between the flywheel 2 and the synchronous condenser 4. This solution is cheap, but the flywheel 2 can only provide direct rotational inertia when the speed of the flywheel 2 is the same as the speed of the synchronous condenser 4 during the energy storage waiting stage.

[0069] Ginseng Fig.10 In actual application, based on Example 2, two universal joints 33 are provided on the outer transmission shaft of the transmission 7, and the flywheel and the synchronous phase regulator are rotationally connected through the universal joints 33. Due to the universal joints, the flywheel can be underground and the phase regulator can be on the ground, and the layout is more flexible.

[0070] The generator motor 3 can also cooperate with the first clutch 5 and the first transmission 7 to continuously operate, so that the generator motor 3 drives the synchronous phase condenser 4 to start through the flywheel 2.

[0071] In practical applications, the first transmission 7 may also have only two gears, and is transmission-connected to the synchronous condenser 4 only in the waiting stage after energy charging or energy release is completed.

[0072] In practical applications, the clutch, hydraulic coupling, and transmission can adopt similar structures in automobiles, such as dual-clutch automatic transmission, AT automatic transmission, etc., to form an integrated structure.

[0073] The above are only preferred embodiments of the present invention, and the technologies in various solutions can also be used in combination.

Claims

1. A multifunctional flywheel energy storage device, characterized in that: The invention comprises a frame (1), the frame (1) is rotatably connected to a flywheel (2), the flywheel (2) is transmission-connected to a generator motor (3), the flywheel (2) is transmission-connected to a synchronous condenser (4), and a first clutch (5) is transmission-connected between the flywheel (2) and the synchronous condenser (4).

2. A multifunctional flywheel energy storage device according to claim 1, characterized in that: A first hydraulic torque converter or a first hydraulic coupling (6) and a first transmission (7) are transmission-connected between the flywheel (2) and the synchronous condenser (4).

3. A multifunctional flywheel energy storage device according to claim 2, characterized in that: The flywheel (2), the generator motor (3) and the synchronous condenser (4) are coaxial and arranged horizontally.

4. A multifunctional flywheel energy storage device according to claim 2, characterized in that: The flywheel (2) is an air cushion flywheel (2).

5. A multifunctional flywheel energy storage device according to claim 4, characterized in that: The flywheel (2) is connected to the generator motor (3) via a first transmission shaft (8); a first bevel gear (9) is provided on the first transmission shaft (8); the first bevel gear (9) is transmission-connected to a second bevel gear (10); the second bevel gear (10) is connected to a first clutch (5), a first hydraulic coupler (6) or a first hydraulic torque converter, a first transmission (7) and a synchronous condenser (4) via a second transmission shaft (11); and the second transmission shaft (11) is rotationally connected to the frame (1).

6. A multifunctional flywheel energy storage device according to claim 5, characterized in that: A first additional air cushion flywheel (12) and a second additional air cushion flywheel (13) are respectively arranged on both sides of the second transmission shaft (11); a common generator motor (14) is arranged between the two additional air cushion flywheels (2); a third bevel gear (17) is arranged on the power shaft of the common generator motor (14); a fourth bevel gear (16) is arranged on the second transmission shaft (11); the first additional air cushion flywheel (12) is coaxially connected to the third transmission shaft (18); the third transmission shaft (18) and the third bevel gear (17) are connected via a first transmission assembly (19); the third transmission shaft (18) and the fourth bevel gear (16) are connected via a second transmission assembly (20); the second additional air cushion flywheel (13) is coaxially connected to the fourth transmission shaft (21); the fourth transmission shaft (21) and the third bevel gear (17) are connected via a third transmission assembly (22); the fourth transmission shaft (21) and the fourth bevel gear (16) are connected via a fourth transmission assembly (23).

7. A multifunctional flywheel energy storage device according to claim 6, characterized in that: The first transmission assembly (19), the second transmission assembly (20), the third transmission assembly (22) and the fourth transmission assembly (23) have the same structure and all comprise: a main shaft (24), a second clutch (25), a second hydraulic coupler (26), a second transmission (27), a third clutch (31) and three bevel gears (28).

8. A multifunctional flywheel energy storage device according to claim 5, characterized in that: The synchronous condenser (4) is arranged vertically, the second transmission shaft (11) is connected to the synchronous condenser (4) via a fifth bevel gear (29) and a sixth bevel gear (30), and the combination of the flywheel (2) and the generator motor (3) comprises a plurality of them.

9. A multifunctional flywheel energy storage device according to claim 7 or 8, characterized in that: A fourth clutch (32) is provided on the second transmission shaft (11).

10. A multifunctional flywheel energy storage device according to claim 1 or 2, characterized in that: The flywheel (2), the generator motor (3) and the synchronous condenser (4) are coaxial and arranged vertically.

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