A flywheel energy storage device

Abstract

The present invention provides a flywheel energy storage device, comprising: a base; a protective shell, the protective shell is fixedly connected to the upper end of the base; a magnetic suspension stator, the magnetic suspension stator is fixedly connected to the upper end of the base, and the magnetic suspension stator is connected to the side end of the protective shell to form a hollow tubular ring; a motor stator, the motor stator is fixedly connected to the protective shell and the outer surface of the magnetic suspension stator; a flywheel, the flywheel is arranged inside the hollow tubular ring formed by the magnetic suspension stator and the protective shell; a swivel bracket, the swivel bracket is fixedly connected to the side end of the flywheel close to the protective shell; a magnetic suspension rotor, the magnetic suspension rotor is fixedly connected to the side end of the flywheel close to the magnetic suspension stator; and a motor rotor, the motor rotor is fixedly connected to the outer surface of the swivel bracket. The present invention can be used for power energy storage and auxiliary power system peak load control, with significant economic benefits.

Description

Technical Field

[0001] The present invention relates to the field of new energy technology, and in particular to a flywheel energy storage device. Background Art

[0002] Traditional power systems use coal, oil, natural gas, hydropower, etc. as primary energy sources. Due to their storable characteristics and stable and reliable power generation technology, the supply side of the power system is controllable and adjustable. With the large-scale access of renewable energy power generation, wind power, solar energy and other renewable energy sources have the characteristics of non-storability and volatility as primary energy sources, which makes the output of wind power and other renewable energy sources have greater uncertainty, and the controllability of the power system supply side is reduced. On the other hand, on the demand side, due to the imbalance of electricity demand in different time periods, the electricity demand is tight during the day and the electricity supply is in excess at night. Local governments use peak and valley electricity prices for adjustment, which increases the actual electricity cost of users.

[0003] In this context, large-scale energy storage technology came into being. The current mainstream energy storage technology is chemical battery energy storage, followed by pumped storage and flywheel energy storage. Compared with chemical battery energy storage, the advantages of traditional flywheel energy storage are high safety (mainly low fire risk), long service life (unlimited number of charge and discharge times, theoretical life is about 3 times more than chemical batteries), good environmental adaptability (not affected by low temperature), low cost of decommissioning and recycling (residual value, no processing costs), etc.; the disadvantages are: 1. Limited by factors such as transmission system and materials, the energy storage capacity of a single machine is small; 2. Due to the existence of a mechanical transmission system, there is mechanical wear, and the probability of mechanical failure after a certain period of operation is high; 3. The energy density is low; 4. Affected by wind resistance, transmission friction, etc., the energy storage loss is high.

[0004] The existing flywheel energy storage technology uses a fixed shaft technology, accompanied by a transmission system, which increases the friction resistance of the flywheel rotor. At the same time, since the flywheel is in a high-speed rotating state, the air resistance cannot be ignored, which will consume a lot of energy and cannot meet the needs of grid peak regulation. Summary of the invention

[0005] The object of the present invention is to provide a flywheel energy storage device to solve the problem of insufficient controllability of the power system during peak and valley periods of electricity consumption.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a flywheel energy storage device, comprising: a base; a protective shell, the protective shell is fixedly connected to the upper end of the base; a magnetic levitation stator, the magnetic levitation stator is fixedly connected to the upper end of the base, and the magnetic levitation stator is connected to the side end of the protective shell to form a hollow tubular ring; a motor stator, the motor stator is fixedly connected to the protective shell and the outer surface of the magnetic levitation stator; a flywheel, the flywheel is arranged inside the hollow tubular ring formed by the magnetic levitation stator and the protective shell; a swivel bracket, the swivel bracket is fixedly connected to the side end of the flywheel close to the protective shell; a magnetic levitation rotor, the magnetic levitation rotor is fixedly connected to the side end of the flywheel close to the magnetic levitation stator; and a motor rotor, the motor rotor is fixedly connected to the outer surface of the swivel bracket.

[0007] As an improvement of the present invention, the base is a trapezoidal bracket, and a bolt hole is provided at the bottom end of the base.

[0008] As an improvement of the present invention, the protective shell is a concave ring.

[0009] As an improvement of the present invention, the magnetic levitation stator is a convex circular ring electromagnet, and the magnetic levitation stator is concentrically and coaxially connected to the protective shell to form a hollow tubular circular ring with a vacuum environment inside; in the vacuum environment, the air is first replaced by hydrogen or helium, and then the hydrogen or helium is extracted.

[0010] As an improvement of the present invention, the motor stator is one or more uniformly arranged stator iron cores, and the outer surface of the motor stator is provided with a stator winding.

[0011] As an improvement of the present invention, the flywheel cross-section adopts a circular or elliptical high-strength material ring, and the material is one of carbon fiber, graphene, carbon nanotubes, high-strength aerogel, aluminum-lithium alloy or titanium alloy; the overall surface of the flywheel connected to the rotating bracket, magnetic levitation rotor and motor rotor is smoothed; the flywheel is prestressed; the flywheel and the protective shell are arranged concentrically and coaxially.

[0012] As an improvement of the present invention, the swivel bracket is a rigid circular ring bracket, the material of which is one of aluminum alloy, aluminum-lithium alloy or titanium alloy, and the swivel bracket is fixedly connected to one end of the flywheel ring close to the center.

[0013] As an improvement of the present invention, the magnetic suspension rotor is a circular permanent magnet, and the magnetic suspension rotor is fixedly connected to an end of the flywheel ring away from the center.

[0014] As an improvement of the present invention, the motor rotor is two or more permanent magnets arranged evenly.

[0015] As an improvement of the present invention, it also includes: a current conversion device, which is a rectifier cabinet and an inverter; in the input current circuit, the rectifier cabinet, the inverter and the flywheel energy storage device are connected in sequence; in the output current circuit, the flywheel energy storage device, the rectifier cabinet and the inverter are connected in sequence.

[0016] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a schematic diagram of AA of the present invention;

[0020] Figure 3 This is a schematic diagram of the stator position of the motor of the present invention;

[0021] Figure 4 It is the BB schematic diagram of the present invention;

[0022] Figure 5 It is a circuit flow chart of the present invention.

[0023] The components in the figure are:

[0024] 1 is the base, 2 is the protective shell, 3 is the magnetic suspension stator, 4 is the motor stator, 5 is the flywheel, 6 is the swivel bracket, 7 is the magnetic suspension rotor, 8 is the electronic rotor, 9-1 is the rectifier cabinet, and 9-2 is the inverter. DETAILED DESCRIPTION

[0025] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0026] See also Figure 1A flywheel energy storage device comprises: a base 1; a protective shell 2, wherein the protective shell 2 is fixedly connected to the upper end of the base 1; a magnetic suspension stator 3, wherein the magnetic suspension stator 3 is fixedly connected to the upper end of the base 1, and the magnetic suspension stator 3 is connected to the side end of the protective shell 2 to form a hollow tubular ring; a motor stator 4, wherein the motor stator 4 is fixedly connected to the protective shell 2 and the outer surface of the magnetic suspension stator 3; a flywheel 5, wherein the flywheel 5 is arranged inside the hollow tubular ring formed by the magnetic suspension stator 3 and the protective shell 2; a swivel bracket 6, wherein the swivel bracket 6 is fixedly connected to the side end of the flywheel 5 close to the protective shell 2; a magnetic suspension rotor 7, wherein the magnetic suspension rotor 7 is fixedly connected to the side end of the flywheel 5 close to the magnetic suspension stator 3; and a motor rotor 8, wherein the motor rotor 8 is fixedly connected to the outer surface of the swivel bracket 6.

[0027] The working principle and beneficial effects of the above technical solution are as follows: flywheel energy storage is used. During periods of excess electricity supply, the electric energy drives the motor and converts the electric energy into the kinetic energy of the flywheel for storage. When the stored energy needs to be output, the flywheel drives the motor and converts the flywheel kinetic energy into electric energy for output. Compared with other energy storage technologies, flywheel energy storage is safer and has a longer service life.

[0028] In one embodiment of the present invention, the base 1 is a trapezoidal bracket, and a total of four bases are provided, and the bases are evenly arranged at an angle of 90°. The bottom end of the base 1 is provided with a bolt hole.

[0029] The working principle and beneficial effects of the above technical solution: the base is used to support the entire device, and setting four supporting points is more stable, and the bolt holes are used to fix the connection with the ground for easy installation.

[0030] See also Figure 2 In one embodiment of the present invention, the protective shell 2 is a concave ring.

[0031] See also Figure 2 In one embodiment of the present invention, the magnetic levitation stator 3 is a convex annular electromagnet made of neodymium iron boron strong magnetic material. The magnetic levitation stator 3 is concentrically and coaxially connected to the protective shell 2 to form a hollow tubular annular ring with a vacuum environment inside. In the vacuum environment, the air is first replaced by helium and then the helium is extracted.

[0032] The working principle and beneficial effects of the above technical solution are as follows: the magnetic levitation stator and the protective shell form a hollow tubular ring, which serves as the movement space of the flywheel. The magnetic levitation stator prevents the flywheel from transmitting information to other components, and the movement space is a vacuum environment. Small molecule gases such as helium are used to reduce the kinetic energy loss caused by the collision between the vacuum residual gas molecules and the flywheel, greatly reducing the wind resistance and transmission friction during the flywheel movement, reducing energy storage losses, and improving economic benefits.

[0033] See also Figure 3 In one embodiment of the present invention, the motor stator 4 is three evenly arranged stator cores, and the outer surface of the motor stator 4 is provided with a stator winding.

[0034] The working principle and beneficial effects of the above technical solution are as follows: the electronic stator generates an alternating magnetic field, which alternately produces an attraction and repulsion effect on the motor rotor.

[0035] In one embodiment of the present invention, the cross-section of the flywheel 5 is a circular ring of carbon fiber material, and the flywheel 5 is connected to the rotating bracket 6, the magnetic levitation rotor 7 and the motor rotor 8, and the overall surface is smoothed; the flywheel 5 is prestressed; and the flywheel 5 is coaxially arranged with the protective shell 2.

[0036] The working principle and beneficial effects of the above technical solution: According to the calculation formula of kinetic energy, the kinetic energy stored when the flywheel rotates at high speed is proportional to the rotational inertia of the flywheel (J = (0.5 ~ 1) * M * R^2) and the angular velocity of the flywheel rotation. The flywheel material is selected from carbon fiber materials with high tensile strength, which can further increase the limit angular velocity that the flywheel can withstand and increase the total energy storage of the flywheel. The overall surface treatment is carried out to reduce the surface roughness and thus reduce the wind resistance, and the prestressed process is used to increase the strength of the flywheel.

[0037] In one embodiment of the present invention, the swivel bracket 6 is a rigid circular bracket made of titanium alloy, and the swivel bracket 6 is fixedly connected to one end of the flywheel 5 circular ring close to the center.

[0038] The working principle and beneficial effects of the above technical solution: the flywheel is made of carbon fiber material, which is a flexible material. In order for the flexible material to form a closed loop, it must be attached to a rigid material.

[0039] In one embodiment of the present invention, the magnetic suspension rotor 7 is a ring-shaped permanent magnet made of NdFeB strong magnetic material, and the magnetic suspension rotor 7 is fixedly connected to one end of the flywheel 5 ring away from the center.

[0040] The working principle and beneficial effects of the above technical solution: The interaction between the magnetic suspension stator and the magnetic suspension rotor enables the flywheel to be suspended, which greatly reduces the transmission loss of the flywheel.

[0041] In one embodiment of the present invention, the motor rotor 8 is three evenly arranged permanent magnets.

[0042] The working principle and beneficial effects of the above technical solution are as follows: the main function of the motor rotor is to attract and repel the alternating magnetic poles of the motor stator during the energy storage process to drive the flywheel to rotate; during the discharge process, it interacts with the motor stator core, causing the core magnetic lines of force to change, generating an induced electromotive force, and then forming an alternating current.

[0043] See also Figure 5 In one embodiment of the present invention, it also includes: a current conversion device, which is a rectifier cabinet 9-1 and an inverter 9-2; in the input current circuit, the rectifier cabinet 9-1, the inverter 9-2 and the flywheel energy storage device are connected in sequence; in the output current circuit, the flywheel energy storage device, the rectifier cabinet 9-1 and the inverter 9-2 are connected in sequence.

[0044] The working principle and beneficial effects of the above technical solution are as follows: during the energy storage process, the industrial frequency AC power to be stored is output as DC through the rectifier cabinet, converted into high-frequency AC power through the inverter, and the drive motor (under this condition, the motor is used as an electric motor) drives the flywheel to accelerate, and the electrical energy is converted into the kinetic energy of the flywheel; during the discharge process, the flywheel drives the motor (under this condition, the motor is used as a generator) to rotate, and the kinetic energy of the flywheel is converted into electrical energy, emitting high-frequency AC power, which is formed into industrial frequency AC power through rectification, inversion and other devices, thereby facilitating reasonable regulation of the supply side of the power system during peak and valley periods of electricity consumption.

[0045] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flywheel energy storage device, characterized in that: include: Base (1); A protective shell (2), the protective shell (2) being fixedly connected to the upper end of the base (1); A magnetic suspension stator (3), the magnetic suspension stator (3) being fixedly connected to the upper end of the base (1), and the magnetic suspension stator (3) being connected to the side end of the protective shell (2) to form a hollow tubular ring; A motor stator (4), the motor stator (4) being fixedly connected to the protective housing (2) and the outer surface of the magnetic suspension stator (3); A flywheel (5), the flywheel (5) being arranged inside a hollow tubular ring formed by the magnetic suspension stator (3) and the protective housing (2); A swivel bracket (6), the swivel bracket (6) being fixedly connected to a side end of the flywheel (5) close to the protective housing (2); A magnetic suspension rotor (7), the magnetic suspension rotor (7) being fixedly connected to a side end of the flywheel (5) close to the magnetic suspension stator (3); A motor rotor (8), wherein the motor rotor (8) is fixedly connected to the outer surface of the swivel bracket (6).

2. A flywheel energy storage device according to claim 1, characterized in that: The base (1) is a trapezoidal bracket, and a bolt hole is provided at the bottom end of the base (1).

3. A flywheel energy storage device according to claim 1, characterized in that: The protective shell (2) is a concave circular ring.

4. A flywheel energy storage device according to claim 1, characterized in that: The magnetic suspension stator (3) is a convex annular electromagnet, and the magnetic suspension stator (3) is concentrically connected to the protective shell (2) to form a hollow tubular annular ring, the interior of which is a vacuum environment; In the vacuum environment, air is first replaced by hydrogen or helium, and then the hydrogen or helium is extracted.

5. A flywheel energy storage device according to claim 1, characterized in that: The motor stator (4) is one or more uniformly arranged stator iron cores, and the outer surface of the motor stator (4) is provided with a stator winding.

6. A flywheel energy storage device according to claim 1, characterized in that: The cross section of the flywheel (5) is a circular or elliptical high-strength material ring, and the material is one of carbon fiber, graphene, carbon nanotubes, high-strength aerogel, aluminum-lithium alloy or titanium alloy; the flywheel (5) is connected to the rotating support (6), the magnetic suspension rotor (7) and the motor rotor (8) and the overall surface is smoothed; the flywheel (5) is processed by prestressing; the flywheel (5) and the protective shell (2) are arranged concentrically.

7. A flywheel energy storage device according to claim 1, characterized in that: The rotating support (6) is a rigid circular ring support, and its material is one of an aluminum alloy, an aluminum-lithium alloy or a titanium alloy. The rotating support (6) is fixedly connected to one end of the flywheel (5) circular ring close to the center.

8. A flywheel energy storage device according to claim 1, characterized in that: The magnetic suspension rotor (7) is a circular ring-shaped permanent magnet, and the magnetic suspension rotor (7) is fixedly connected to an end of the flywheel (5) circular ring away from the center.

9. A flywheel energy storage device according to claim 1, characterized in that: The motor rotor (8) is two or more permanent magnets that are evenly arranged.

10. A flywheel energy storage device according to claim 1, characterized in that: Also includes: A current conversion device, the current conversion device is a rectifier cabinet (9-1) and an inverter (9-2); in a circuit for inputting current, the rectifier cabinet (9-1), the inverter (9-2) and a flywheel energy storage device are connected in sequence; in a circuit for outputting current, the flywheel energy storage device, the rectifier cabinet (9-1) and the inverter (9-2) are connected in sequence.

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