KR101460854B1 - Hybrid flywheel energy storage system - Google Patents

Abstract

A flywheel energy storage device according to an embodiment of the present invention is a mechanical storage device that rotates a rotating body using a motor to store electric energy in a kinetic energy state and then converts the rotated rotating body into electric energy through a generator . We use ball bearings, electromagnet bearings and superconducting bearings to reduce rotational loss, and electromagnet bearings to control vibrations. However, by replacing electromagnet bearings as vibration dampers with ball bearings, we can reduce expenses and reduce friction losses. In order to improve the economical efficiency and efficiency, permanent magnet bearings and superconducting bearings are used in combination, which can be used as a flywheel energy storage device. According to the embodiment of the present invention, the vibration of the rotating body can be replaced by a ball bearing instead of the electromagnet bearing, and the permanent magnet bearing or the superconducting bearing can be used to increase the utilization of the inexpensive and highly efficient flywheel energy storage device.

Description

HYBRID FLYWHEEL ENERGY STORAGE SYSTEM [0001]

A flywheel energy storage device for storing electrical energy as rotational kinetic energy. More particularly, a bearing and a levitation system are disclosed to reduce rotational loss when stored with rotational kinetic energy.

As the demand for electric power increases, the difference in the amount of electricity used for day and night increases. Recently, the proportion of natural energy usage continues to increase and the size of power generation is also becoming larger and larger. It is coming in. Generally, in the case of renewable energy generation, photovoltaic or wind power generation, it is considered that the need for a storage device is being considered because the amount of generated electricity is not stable due to irregular natural energy.

In order to solve such a problem, various types of storage devices have been considered. However, considering the generation amount of new and renewable energy over time or the storage of enormous amount of electric power instantaneously discharged according to the suspension of a railway vehicle, The development of energy storage devices is underway.

Typical storage devices form an upper reservoir and a lower reservoir, such as mountainous areas, to pour the water in the lower reservoir at night when the electricity cost is low, so that water is drained from the upper reservoir to the lower reservoir when the electricity cost is high during the day A pumped storage system is used to cool the water by using the cheap power of the night and to blow the fan in the day to replace the air conditioner. It is a chemical battery that stores chemical energy by storing compressed air or generating chemical reaction. NaS cell and lithium ion battery are used. Especially, electric energy which is strong for high-speed charging and discharging is stored as rotational kinetic energy When you need it, you can use a generator to convert the rotational kinetic energy into electric energy, Etc. wheel energy storage device is being developed.

Among them, the flywheel energy storage device uses rotating bearings to reduce rotation loss. When using ball bearings, mechanical flywheel energy storage devices, electromagnet bearings, electromagnet flywheel energy storage devices, superconducting bearings, superconducting flywheel energy And storage devices.

In each case, the mechanical flywheel energy storage device uses a mechanical ball, so it can not be used as an efficient flywheel system because of its large frictional loss. In the case of using an electromagnet bearing, it is necessary to float the rotating body with an electromagnet. When using superconducting bearings, cooling equipment and superconductors are costly and difficult to economize.

Therefore, development of an economical flywheel energy storage device is required.

An object of an embodiment of the present invention is to provide a flywheel energy storage device capable of storing electric energy in a rotational motion and converting rotational energy into electric energy when necessary, and to provide a system that is inexpensive and highly efficient.

It is another object of the present invention to provide a flywheel energy storage device that can be used as an energy storage device such as a railway, It is possible to store flywheel energy storage devices for various purposes, such as when stored energy is stored for a long time and when it is needed, and to provide a storage system with a higher storage efficiency at a lower cost.

In the flywheel energy storage device according to the embodiment of the present invention, a ball bearing is used as a bearing used for reducing rotation loss. In the case of a mechanical flywheel energy storage system using a conventional ball bearing, the ball bearing and the floating shaft were also fixed by the same ball bearing or pin, which was also a friction loss due to contact.

In the case of the present invention, the bearing which catches the shaking of the shaft by the ball bearing and lifts the rotating body can use the permanent magnet bearing and the superconducting bearing to lift the weight of the rotating body without friction to reduce friction loss.

The ball of the ball bearing is made of a metal or a ceramic, as well as a material capable of maintaining the strength of the rotating body due to friction.

The permanent magnet bearings and the superconducting bearings of the system may be used simultaneously in one system or may be used separately depending on the application.

In case of permanent magnet bearing of the above system, it is installed using attraction force of opposite polarity when it is installed on permanent magnet bearing, and it is installed by using repulsive force of same polarity when installed on the lower part.

The permanent magnet bearings of the system may be installed only on the top and only on the bottom and may be installed on both sides depending on the capacity.

In the case of the superconducting bearings of the system, only the upper part can be installed, and only the lower part can be installed and it can be installed on both sides according to the capacity.

In the superconducting bearing of the above system, the pinning force between the superconductor and the permanent magnet due to field cooling under the magnetic field and the mixed force of the repulsive force and the pinning force between the superconductor and the permanent magnet due to zero field cooling Can be installed.

The power conversion apparatus of the above system may be installed anywhere in the upper part of the rotating shaft and may be installed at an optimal position according to the system.

The ball bearings of the system may be installed one or more than one according to the size of the system, and it may be installed at any position among the positions, and may be installed at an optimum position according to the system.

The rotating body of the system may be made of metal or a graphite or synthetic composite which is light and tough, and the installation position may be installed at any position in order to optimize the system.

It is not necessary to attach a damper which is an electromagnet bearing for preventing the rotation shaft from shaking.

Meanwhile, in the mechanical flywheel energy storage device using the ball bearing according to the embodiment of the present invention, compared to the electromagnet flywheel energy storage device or the superconducting flywheel energy storage device, the ball may be used to rotate the shaft, In the case of other kinds of systems, the damper of the electromagnet bearing is not used to prevent the shaking of the rotating shaft, which is cheaper and can be constituted as the most stable system among the three types.

In the case of the electromagnet flywheel energy storage device and the superconducting flywheel energy storage device, it is difficult to cope with instantaneous shaking because it controls the shaking of the rotating shaft in a noncontact manner. As a result, when the rotating shaft comes into contact with the stator beyond the contactless interval, It is the safest system among the three types of systems that can withstand the shaking of the instantaneous device in the case of the mechanical flywheel compared to the danger that may occur.

Therefore, although the system of the present invention is difficult to install on a moving object in other systems, it can be installed on an object such as a railway or a bus which is highly stable when rotated.

Meanwhile, the inexpensive and highly efficient flywheel energy storage device according to the embodiment of the present invention can be used for a flywheel energy storage device that is required to be quickly stored due to a sudden change in power generation amount, such as wind or sunlight, It can store a lot of electric energy in charge and discharge field, and it can develop a large amount instantaneously. It can also be used extensively in uninterruptible power supplies that can be stored quickly and used quickly.

According to the embodiment of the present invention, the flywheel energy storage device has a high storage energy density, a long service life, an environment-friendly property, no generated gas, harmful industrial waste, excellent instantaneous charge / discharge characteristics, However, it has not been widely used because it is expensive. However, it is possible to develop an inexpensive and efficient flywheel energy storage device through the present invention and thus it can be widely used.

In addition, according to the embodiment of the present invention, when comparing three kinds of systems in terms of stability from a mechanical flywheel energy storage device, an electromagnet flywheel energy storage device, and a superconducting flywheel energy storage device, the contact type control method is superior to the non- It has a much more stable advantage and can be used for a wider range of applications. For example, in the case of the other method, it is difficult to use in a moving object, but in the case of the present invention, it can also be utilized in a moving object.

FIG. 1 is a view showing a flywheel energy storage device in which two ball bearings and a permanent magnet bearing are installed at a lower portion according to an embodiment of the present invention. FIG.
FIG. 2 is a view showing a flywheel energy storage device in which two ball bearings and a superconducting bearing are installed in a lower portion according to an embodiment of the present invention. FIG.
FIG. 3 is a view illustrating a flywheel energy storage device having two ball bearings and a permanent magnet bearing mounted thereon according to an embodiment of the present invention.
FIG. 4 is a view illustrating a flywheel energy storage device in which two ball bearings and a superconducting bearing are installed on an upper side according to an embodiment of the present invention.
FIG. 5 is a view illustrating a flywheel energy storage device in which two ball bearings and permanent magnet bearings according to an embodiment of the present invention are installed in upper and lower portions.
6 is a view illustrating a flywheel energy storage device in which two ball bearings and a superconducting bearing according to an embodiment of the present invention are installed at two upper and lower places.
7 is a view showing that a stepped bearing is installed in a lower portion of the rotating body.
8 is a view showing that a permanent magnet is fixed to a rotary shaft and a permanent magnet is fixed to a lower fixed plate.
9 is a view showing that a permanent magnet is fixed to a rotary shaft and a superconductor is fixed to a lower fixed plate.
10 is a view showing that a permanent magnet is fixed to a rotary shaft, a superconductor is fixed to a lower fixed plate in a vertical direction of gravity, and a permanent magnet is fixed in a gravity direction.
11 is a view showing that a permanent magnet is fixed to a rotary shaft and a permanent magnet is fixed to a lower fixed plate in a vertical direction of gravity and a superconductor is fixed in a gravity direction.

Hereinafter, configurations and applications according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE INVENTION The following description is one of many aspects of the claimed invention and the following description forms part of a detailed description of the present invention.

In the following description, well-known functions or constructions are not described in detail for the sake of clarity and conciseness.

FIG. 1 is a plan view showing a flywheel energy storage device in which two ball bearings and a permanent magnet bearing are installed at the bottom according to an embodiment of the present invention. FIG.

The flywheel energy storage device 100 according to an embodiment of the present invention is stored with rotational kinetic energy by rotating the rotating body 105 by the electric motor / generator 103, 104 that converts electric energy into rotational kinetic energy Is a storage device that can be converted from rotational kinetic energy into electric energy by electric power generators 103 and 104 as needed.

However, the present invention is not limited thereto, and various types of arrangements of permanent magnet bearings, superconducting bearings, ball bearings, electric motors / generators, and rotors may be used. It is natural that the flywheel energy storage device can be constituted.

Referring to FIGS. 1 through 6, the flywheel energy storage device 100 according to an exemplary embodiment of the present invention may include any number of the plurality of constituent elements.

First, the flywheel energy storage device 100 stores electric energy in a rotating kinetic energy state in the rotating body 105 by means of electric power generators 103 and 104 and is supplied by electric power generators 103 and 104 It can be converted into electric energy and used. In order to reduce the friction loss due to rotation, ball bearings 101 and 102 are used for vibration control. In order to eliminate the friction loss due to the weight of the rotating body by floating the rotating body, The permanent magnets 110 and the lower permanent magnets 120 fixed to the lower fixed plate 520 are composed of permanent magnet bearings installed with the same polarity and applied with a repulsive force of the permanent magnets. And the lower ball bearing is fixed to the lower fixing plate 520 together with the bearing. The structure of the flywheel energy storage device 100 may be such that the aligning jig 530 is installed at the lower part to facilitate alignment when the system is aligned to operate but the lower alignment jig may be removed when the operation is started.

The used ball 101 is fixed by the ball case 102 and the upper permanent magnet 110 and the lower permanent magnet 120 are opposed to the same pole.

2, the structure of the flywheel energy storage device 100 is as shown in Fig. 1, and compared to the floating unit, that is, the floating system of this embodiment is constituted by the upper permanent magnet 110 and the lower permanent magnet 120 of Fig. The structure of the flywheel energy storage device 100 using the superconducting bearing, in which the upper permanent magnet 310 is attached to the rotating body 105 and rotates and the lower part is composed of the superconductor 300 fixed to the lower fixed plate 520 to be.

3 is a perspective view of a permanent magnet bearing constructed of an upper permanent magnet 110 and a lower permanent magnet 120 in FIG. 1 in order to float the flywheel energy storage device 100 to eliminate frictional losses . The upper permanent magnet 210 is fixed to the center fixing plate 500 and the lower permanent magnet 220 is attached to the rotating body 105 and is configured to rotate. In this case, the permanent magnets 210, And the permanent magnets 210 and 220 act on the flywheel energy storage device 100 using the permanent magnet bearings.

FIG. 4 shows a superconducting bearing, which is composed of an upper permanent magnet 310 and a lower superconductor 300 in FIG. 2, installed on the upper part of the system in order to float the flywheel energy storage device 100 to eliminate friction loss. The upper superconductor 400 is fixed to the central fixed plate 500 and the lower permanent magnet 410 is attached to the rotating body 105 and is configured to rotate. The structure of the flywheel energy storage device 100 uses the superconducting bearing.

FIG. 5 is a perspective view of a permanent magnet bearing comprised of an upper permanent magnet 110 and a lower permanent magnet 120 in FIG. 1 and a permanent magnet bearing 120 of FIG. And a flywheel energy storage device (100) constructed by using two permanent magnet bearings for installing a magnetic bearing on the upper part of the system. The upper permanent magnet 110 installed at the lower part is attached to the rotating body 105 and the lower permanent magnet 120 is fixed to the lower fixed plate 520. The upper permanent magnet 210 installed at the upper part is fixed to the central fixed plate 500 And the lower permanent magnet 220 installed on the upper part is attached to the rotating body 105 and rotates. In this case, in the case of the upper permanent magnets 210 and 220, And the permanent magnets 110 and 120 installed at the lower part are installed in the same pole.

6 is an upper permanent magnet 310 attached to the rotating body in FIG. 2 and a superconductor 300 fixed to the lower fixed plate 520 in order to lift the flywheel energy storage device 100 to eliminate frictional losses. And a flywheel energy storage device 100 constructed using two superconducting bearings that are installed on the upper part of the system in FIG. 4 and the superconducting bearings of FIG. The upper permanent magnet 310 installed on the lower part is attached to the rotating body 105. The lower superconductor 300 is fixed to the lower fixed plate 520 and the upper superconductor 400 installed on the upper part is fixed to the central fixed plate 500 And a lower permanent magnet 410 fixed to the upper portion of the flywheel energy storage device 100 is attached to the rotating body 105 and configured to rotate.

Meanwhile, in the flywheel energy storage device 100 of this embodiment, a permanent magnet bearing may be used for the upper portion and a superconducting bearing may be used for the lower portion, as in the case of using two permanent magnet bearings and the case of using two superconducting bearings. And superconducting bearings can be used as the permanent magnet bearings.

7, stepped bearings can be installed on the lower portion of the rotating body. In addition to mechanical bearings for ball bearings, these bearings can also be used as bearings for electromagnet flywheel energy storage devices or superconducting flywheel energy storage devices.

The permanent magnet 600 is fixed to the rotating body shown in FIG. 8 and the permanent magnet 610 is fixed to the lower fixed plate.

9, the permanent magnet 600 is fixed to the rotating body, and the superconductor 700 is fixed to the lower fixed plate.

The permanent magnet 600 is fixed to the rotating body shown in FIG. 10, and the superconductor 700 is fixed to the lower fixed plate in the vertical direction of gravity, and the permanent magnet 610 is fixed in the gravity direction.

The permanent magnet 600 is fixed to the rotating body shown in FIG. 11, the permanent magnet 610 is fixed to the lower fixed plate in the vertical direction of gravity, and the superconductor 700 is fixed in the gravity direction.

However, the present invention is not limited thereto, and the structure of the three bearings may be variously changed according to the length of the rotating shaft and the formation of the system. The system can be optimized.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

100: Flywheel energy storage device
101: ball
102: ball case
103: Electric / generator coil
104: Electric / generator permanent magnet
105: rotating body
106:
110: upper permanent magnet installed on the lower part
120: lower permanent magnet installed at the lower part
210: upper permanent magnet disposed on the upper part
220: lower permanent magnet installed on the upper part
300: superconductor installed in the lower part
310: upper permanent magnet installed at the lower part
400: superconductor installed on the upper part
410: Lower permanent magnet installed on the upper part
500: central fixed plate
510: upper fixing plate
520: lower fixed plate
530: jig for alignment
600: permanent magnet fixed to the rotating plate
610: permanent magnet fixed to bottom fixed plate
700; Superconductor fixed to lower fixed plate

Claims (11)

A rotating body for storing electric energy generated by an electric motor or a generator as rotational kinetic energy or providing stored rotational kinetic energy to the electric motor or generator;
A ball bearing arranged to be able to contact at least a part of the rotating body and reducing a friction loss due to rotation of the rotating body;
A floating unit having a superconductor and a permanent magnet for lifting the rotating body;
A lower fixed plate disposed below the rotating body; And
A central fixed plate surrounding at least an upper end portion of the rotating body;
/ RTI >
The superconductor is attached to either the lower end of the rotating body or the upper end of the lower fixed plate so that the superconductor and the permanent magnet are opposite to each other and the permanent magnet is attached to the other one, Wherein the permanent magnet is attached to one of the lower ends of the central fixed plate and the permanent magnet is attached to the other.
delete A rotating body for storing electric energy generated by an electric motor or a generator as rotational kinetic energy or providing stored rotational kinetic energy to the electric motor or generator;
A bearing disposed so as to be able to contact at least a part of the rotating body and reducing frictional loss due to rotation of the rotating body;
A lifting unit lifting the rotating body; And
A lower fixed plate disposed below the rotating body;
/ RTI >
The floating unit includes:
An upper permanent magnet attached to a lower end of the rotating body; And
And a lower permanent magnet attached to an upper end of the lower fixed plate,
Wherein the upper permanent magnet and the lower permanent magnet are provided with the same polarity so that the rotating body can float with respect to the lower fixed plate by generating a repulsive force.
The method of claim 3,
The bearing is a ball bearing,
Wherein the ball of the ball bearing is comprised of a metal, ceramic or a material capable of reducing frictional losses of the rotating body.
A rotating body for storing electric energy generated by an electric motor or a generator as rotational kinetic energy or providing stored rotational kinetic energy to the electric motor or generator;
A bearing disposed so as to be able to contact at least a part of the rotating body and reducing frictional loss due to rotation of the rotating body;
A lifting unit lifting the rotating body; And
A central fixed plate surrounding at least an upper end portion of the rotating body;
/ RTI >
The floating unit includes:
A lower permanent magnet attached to an upper end of the rotating body; And
And an upper permanent magnet attached to the central fixed plate so as to be positioned on the upper portion of the lower permanent magnet,
Wherein the upper permanent magnet and the lower permanent magnet are provided at mutually different poles.
delete A rotating body for storing electric energy generated by an electric motor or a generator as rotational kinetic energy or providing stored rotational kinetic energy to the electric motor or generator;
A bearing disposed so as to be able to contact at least a part of the rotating body and reducing frictional loss due to rotation of the rotating body;
A lifting unit lifting the rotating body;
A lower fixed plate disposed below the rotating body; And
A central fixed plate surrounding at least an upper end portion of the rotating body;
/ RTI >
The floating unit includes:
Permanent magnets attached to an upper end of the lower fixed plate and a lower end of the rotating body, respectively, and having the same polarity; And
And permanent magnets attached to an upper end of the rotating body and a lower surface of the upper wall of the central fixed plate, respectively, the permanent magnets having opposite poles.
delete A rotating body for storing electric energy generated by an electric motor or a generator as rotational kinetic energy or providing stored rotational kinetic energy to the electric motor or generator;
A bearing disposed so as to be able to contact at least a part of the rotating body and reducing frictional loss due to rotation of the rotating body;
A lifting unit lifting the rotating body; And
A lower fixed plate disposed below the rotating body;
/ RTI >
The lower end of the rotating body and the upper end of the lower fixed plate are provided in a stepwise manner corresponding to each other,
Wherein permanent magnets having mutually different poles are attached to each step of the rotating body and each step of the lower fixed plate. delete delete

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