CN115992807A - Gravity energy storage system - Google Patents
Gravity energy storage system Download PDFInfo
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- CN115992807A CN115992807A CN202111551398.4A CN202111551398A CN115992807A CN 115992807 A CN115992807 A CN 115992807A CN 202111551398 A CN202111551398 A CN 202111551398A CN 115992807 A CN115992807 A CN 115992807A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
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Abstract
The invention relates to the field of energy power generation, and discloses a gravity energy storage system. The gravity energy storage system comprises a supporting unit, an energy storage unit and a conversion unit, wherein the energy temporary storage part is arranged on the supporting unit in a height-adjustable mode, and is provided with an energy release position and an energy storage position, when surplus energy (such as surplus electric energy) is required to be stored, the conversion unit is driven by the surplus energy to lift the energy temporary storage part to the energy storage position from the energy release position and locks the energy temporary storage part at the energy storage position so that the surplus energy is converted into gravitational potential energy of the energy temporary storage part, when the energy is required to be released, the conversion unit unlocks the energy temporary storage part at the energy storage position, and the energy temporary storage part falls to the energy release position from the energy storage position under the action of gravity so that the gravitational potential energy of the energy temporary storage part is converted into target energy (such as electric energy), so that the gravitational potential energy is stored and released by using the gravitational potential energy, the energy is stored at lower cost, and the economical efficiency of the whole system is improved.
Description
Technical Field
The invention relates to the field of energy power generation, in particular to a gravity energy storage system.
Background
In recent years, with the continuous decrease of various fossil energy reserves, together with the continuous increase of environmental factors such as global warming, energy substitution problems and environmental problems have attracted great attention. In order to realize near-zero emission of carbon in the global scope, renewable energy sources such as water energy, wind energy, solar energy and the like are required to be greatly developed.
However, due to the influence of natural environment, renewable energy power generation is unstable, the cost of energy storage and release of the existing energy storage system for renewable energy sources is too high, the subsequent grid-connected conveying and consumption are influenced, and the economical efficiency of the whole system is poor.
Disclosure of Invention
Based on the above problems, the invention aims to provide a gravity energy storage system which can store energy at a lower cost and improve the economical efficiency of the whole system.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a gravity energy storage system, comprising:
a supporting unit;
the energy storage unit comprises an energy temporary storage piece which is arranged on the supporting unit in a height-adjustable manner, and the energy temporary storage piece is provided with an energy release position and an energy storage position;
the conversion unit is connected with the energy temporary storage piece;
the conversion unit is used for lifting the energy temporary storage piece from the energy release position to the energy storage position under the drive of the surplus energy and locking the energy temporary storage piece at the energy storage position so as to convert the surplus energy into gravitational potential energy of the energy temporary storage piece;
the conversion unit is also used for unlocking the energy temporary storage piece at the energy storage position, and the energy temporary storage piece can fall from the energy storage position to the energy release position under the action of gravity so as to convert gravitational potential energy of the energy temporary storage piece into target energy.
As the preferable scheme of the gravity energy storage system, the energy storage unit further comprises a fixed pulley and a traction rope, wherein the fixed pulley is arranged on the supporting unit, the traction rope is wound on the fixed pulley, and the traction rope is used for lifting the energy temporary storage piece.
As the preferable scheme of the gravity energy storage system, the energy storage unit further comprises a movable pulley, the energy temporary storage piece is arranged on the movable pulley, the traction rope is wound on the movable pulley and the fixed pulley, and the traction rope is used for lifting the movable pulley so as to lift the energy temporary storage piece.
As a preferable scheme of the gravity energy storage system, the energy temporary storage piece and the movable pulley are integrally arranged or separately arranged.
As the preferable scheme of the gravity energy storage system, the energy temporary storage piece, the movable pulley and the fixed pulley are respectively provided with a plurality of energy temporary storage pieces.
As a preferred scheme of the gravity energy storage system of the invention, the conversion unit comprises a lifter for pulling the pulling rope to lift the energy temporary storage piece from the energy release position to the energy storage position, and the lifter is also used for converting gravitational potential energy of the energy temporary storage piece into electric energy of the lifter.
As the preferable scheme of the gravity energy storage system, the hoisting machines are provided with two rows, and comprise a plurality of first hoisting machines and a plurality of second hoisting machines which are respectively arranged on two sides of the supporting unit, one end of the hauling rope is connected with the first hoisting machines, and the other end of the hauling rope is connected with the second hoisting machines.
As a preferable scheme of the gravity energy storage system, the first elevator comprises a first electric energy conversion device and a first roller, the first electric energy conversion device is used for driving the first roller to rotate, the second elevator comprises a second electric energy conversion device and a second roller, the second electric energy conversion device is used for driving the second roller to rotate, one end of the hauling rope is connected with the first roller, and the other end of the hauling rope is connected with the second roller.
As a preferred embodiment of the gravity energy storage system of the present invention, the rotation directions of the first drum and the second drum are the same or opposite.
As a preferable scheme of the gravity energy storage system, the first roller is provided with a first brake, the first brake is used for braking the first roller, the second roller is provided with a second brake, and the second brake is used for braking the second roller.
As a preferable scheme of the gravity energy storage system, the lifting machines are provided with a row, and comprise a plurality of first lifting machines arranged on one side of the supporting unit, wherein the first lifting machines are connected with one end of the traction rope, and the other end of the traction rope is connected to the supporting unit.
As a preferable scheme of the gravity energy storage system, the supporting unit comprises a supporting cross beam, a supporting vertical beam and reinforcing ribs, wherein the supporting cross beam and the supporting vertical beam are vertically arranged, and the reinforcing ribs are obliquely arranged with the supporting cross beam and the supporting vertical beam respectively.
As a preferred embodiment of the gravity energy storage system of the present invention, the surplus energy comprises electric energy and/or the target energy comprises electric energy.
The beneficial effects of the invention are as follows:
according to the gravity energy storage system provided by the invention, the energy temporary storage piece is arranged on the supporting unit in a height-adjustable manner, and is provided with the energy release position and the energy storage position, when surplus energy (such as surplus electric energy) is required to be stored, the energy temporary storage piece is lifted to the energy storage position from the energy release position by the conversion unit under the driving of the surplus energy, the energy temporary storage piece at the energy storage position is locked, so that the surplus energy is converted into the gravity potential energy of the energy temporary storage piece, when the energy is required to be released, the energy temporary storage piece at the energy storage position is unlocked by the conversion unit, and falls to the energy release position from the energy storage position under the action of gravity, so that the gravity potential energy of the energy temporary storage piece is converted into target energy (such as electric energy), thereby the storage and release of the energy are carried out by utilizing the gravity potential energy, the energy storage is carried out at lower cost, the economy of the whole system is improved, and the gravity potential energy storage power generation can be realized, and the gravity potential energy storage system is suitable for the storage of renewable energy sources such as wind power, photovoltaic and the power generation scene such as peak clipping, frequency modulation and the like.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following description will briefly explain the drawings needed in the description of the embodiments of the present invention, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the contents of the embodiments of the present invention and these drawings without inventive effort for those skilled in the art.
FIG. 1 is a schematic diagram of a support unit and an energy storage unit in a gravity energy storage system according to an embodiment of the present invention;
FIG. 2 is a schematic front view of a gravity energy storage system (with an energy temporary storage element and a movable pulley integrally arranged) according to an embodiment of the present invention;
FIG. 3 is a schematic side view of a gravity energy storage system (with an energy temporary storage and a movable pulley integrally arranged) according to an embodiment of the present invention;
FIG. 4 is a schematic front view of a gravity energy storage system (with an energy temporary storage element and a movable pulley integrally arranged) according to an embodiment of the present invention in a state of releasing energy;
FIG. 5 is a schematic front view of a gravity energy storage system (with an energy temporary storage member and a movable pulley integrally arranged) according to an embodiment of the present invention in a fully energy storage state;
FIG. 6 is a schematic front view of a gravity energy storage system (with separate energy storage and travelling block) according to an embodiment of the present invention;
fig. 7 is a schematic side view of a gravity energy storage system (with separate energy storage and moving pulley arrangement) according to an embodiment of the present invention.
In the figure:
1-a supporting unit; 2-an energy storage unit; a 3-conversion unit;
11-supporting a cross beam; 12-supporting vertical beams; 13-reinforcing ribs;
21-an energy temporary storage element; 22-a movable pulley; 23-fixed pulleys; 24-pulling ropes;
31-a first elevator; 32-a second elevator;
311-a first roller; 312-a first base;
321-a second roller; 322-second base.
Detailed Description
In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1 to 7, the embodiment provides a gravity energy storage system, which can realize energy storage and power generation by utilizing gravitational potential energy, is suitable for storing renewable energy sources such as wind power, photovoltaic and the like, and is applicable to power generation application scenes such as peak clipping and valley filling, frequency modulation and phase modulation of a power grid, and the gravity energy storage system comprises a supporting unit 1, an energy storage unit 2 and a conversion unit 3. The energy storage unit 2 comprises an energy temporary storage piece 21 which is arranged on the supporting unit 1 in a height-adjustable mode, wherein the energy temporary storage piece 21 is provided with an energy release position and an energy storage position.
The conversion unit 3 is connected to an energy buffer 21. The conversion unit 3 is used for lifting the energy temporary storage element 21 from the energy release position to the energy storage position under the driving of the surplus energy, and locking the energy temporary storage element 21 at the energy storage position so as to convert the surplus energy into gravitational potential energy of the energy temporary storage element 21. The conversion unit 3 is further configured to unlock the energy temporary storage element 21 at the energy storage position, and the energy temporary storage element 21 can drop from the energy storage position to the energy release position under the action of gravity, so that gravitational potential energy of the energy temporary storage element 21 is converted into target energy.
When the surplus energy (for example, surplus electric energy) needs to be stored, the conversion unit 3 lifts the energy temporary storage element 21 from the energy release position to the energy storage position under the drive of the surplus energy, and locks the energy temporary storage element 21 at the energy storage position so as to convert the surplus energy into gravitational potential energy of the energy temporary storage element 21; when energy needs to be released, the conversion unit 3 unlocks the energy temporary storage piece 21 at the energy storage position, and the energy temporary storage piece 21 falls to the energy release position from the energy storage position under the action of gravity, so that gravitational potential energy of the energy temporary storage piece 21 is converted into target energy (such as electric energy), and therefore the gravitational potential energy is utilized for energy storage and release, energy storage is carried out at lower cost, and the economical efficiency of the whole system is improved.
As shown in fig. 1, the support unit 1 may include support beams 11, support vertical beams 12, and reinforcement ribs 13, the support beams 11 and the support vertical beams 12 being vertically disposed, and the reinforcement ribs 13 being obliquely disposed with the support beams 11 and the support vertical beams 12, respectively. The supporting cross beams 11, the supporting vertical beams 12 and the reinforcing ribs 13 form a relatively stable triangular structure, so that the structural strength of the supporting unit 1 is improved. The support cross beam 11, the support vertical beam 12 and the reinforcing ribs 13 are respectively provided with a plurality of reinforcing ribs, the specific number of the reinforcing ribs can be determined according to the field application scene, and the reinforcing ribs are spliced freely and have wide application range.
The energy storage unit 2 may further include a fixed pulley 23 and a traction rope 24, the fixed pulley 23 is disposed on the support unit 1, the traction rope 24 is wound on the fixed pulley 23, and the traction rope 24 is used for lifting the energy temporary storage element 21. The friction resistance of the traction rope 24 is reduced through the fixed pulley 23, the energy loss is reduced, and the energy utilization rate is improved.
In order to further reduce the energy loss, the energy storage unit 2 may further include a movable pulley 22, the energy temporary storage 21 is disposed on the movable pulley 22, the traction rope 24 is wound on the movable pulley 22 and the fixed pulley 23, and the traction rope 24 is used for lifting the movable pulley 22 to lift the energy temporary storage 21. The movable pulley 22 and the fixed pulley 23 form a pulley block to lift the energy temporary storage piece 21, so that the height of the energy temporary storage piece 21 is adjusted, the conversion and storage of the surplus energy to gravitational potential energy of the energy temporary storage piece 21 are completed, the traction requirement of the traction rope 24 is reduced through the movable pulley 22, time and labor are saved, and the service life of the traction rope 24 is prolonged.
In order to increase the total energy storage amount of the whole gravity energy storage system, the energy temporary storage piece 21, the movable pulley 22 and the fixed pulley 23 may be respectively provided with a plurality of energy temporary storage pieces. The movable pulleys 22 are positioned between two adjacent fixed pulleys 23, and the traction ropes 24 sequentially connect the movable pulleys 22 and the fixed pulleys 23 in series. The energy temporary storage piece 21, the movable pulley 22 and the fixed pulley 23 can be regularly arranged according to a plurality of rows and a plurality of columns, so that the structure is compact, and the occupied space is reduced. In this embodiment, the traction ropes 24 may be steel wire ropes, extending the service life and maximizing load carrying. Of course, in other embodiments, the hauling cable 24 may be made of other materials according to the scene requirements.
As shown in fig. 2 to 5, the energy temporary storage 21 may be integrally provided with the movable pulley 22, and the energy temporary storage 21 is fixedly connected to the movable pulley 22 and is rotated to be lifted along with the movable pulley 22. As shown in fig. 6 and 7, the energy temporary storage 21 may be provided separately from the movable pulley 22, and the energy temporary storage 21 may be suspended from the movable pulley 22 by a link and lifted up and down along with the movable pulley 22.
Optionally, the conversion unit 3 comprises a hoist for pulling the traction rope 24 to lift the energy temporary storage 21 from the energy release position to the energy storage position, the hoist further being for converting gravitational potential energy of the energy temporary storage 21 into electric energy of the hoist. That is, the elevator has two working modes, which can do work and generate electricity.
In this embodiment, the hoist may be provided with two rows including a first hoist 31 and a second hoist 32 respectively provided at both sides of the supporting unit 1, one end of the traction rope 24 is connected with the first hoist 31, and the other end is connected with the second hoist 32. By simultaneously applying the force to both ends of the traction rope 24 by the first and second lifters 31 and 32, energy waste at the other end (fixed end) of the traction rope 24 can be effectively avoided as compared with applying the force to only one end of the traction rope 24.
Optionally, the first lifter 31 includes a first electric energy conversion device and a first roller 311, the first electric energy conversion device is used for driving the first roller 311 to rotate, the second lifter 32 includes a second electric energy conversion device and a second roller 321, the second electric energy conversion device is used for driving the second roller 321 to rotate, one end of the hauling rope 24 is connected with the first roller 311, and the other end is connected with the second roller 321. The first electric energy conversion device and the second electric energy conversion device can be a combination of a generator and a motor, or can be a permanent magnet motor with the generator and the motor integrated into a whole.
The generator refers to a mechanical device for converting other forms of energy into electric energy, which is driven by a water turbine, a steam turbine, a diesel engine or other power machines, converts energy generated by water flow, air flow, fuel combustion or nuclear fission into mechanical energy, transmits the mechanical energy to the generator, and then converts the mechanical energy into electric energy by the generator. The form of the generator is many, but the working principle of the generator is based on the law of electromagnetic induction and the law of electromagnetic force. The general principle of its construction is therefore: the magnetic circuit and the circuit which mutually perform electromagnetic induction are formed by proper magnetic conduction and electric conduction materials so as to generate electromagnetic power and achieve the purpose of energy conversion. The generator is generally composed of a stator, a rotor, an end cover, a bearing, and the like. The stator is composed of a stator core, a coil winding, a machine base and other structural members for fixing the parts. The rotor consists of rotor iron core (or magnetic pole, magnetic yoke) winding, protecting ring, central ring, slip ring, fan, rotating shaft, etc. The stator and the rotor of the generator are connected and assembled by the bearing and the end cover, so that the rotor can rotate in the stator to do the motion of cutting magnetic force lines, thereby generating induced potential, leading out the induced potential through the connecting terminal and connecting the induced potential in a loop, and generating current.
An electric motor is a device that converts electrical energy into mechanical energy. The magnetic power rotating torque is formed by generating a rotating magnetic field by using an electrified coil (namely a stator winding) and acting on a rotor (such as a squirrel-cage closed aluminum frame). The motors are classified into direct current motors and alternating current motors according to the power supply, and most of the motors in the power system are alternating current motors, and can be synchronous motors or asynchronous motors (the magnetic field rotating speed of a motor stator and the rotating speed of a rotor do not keep synchronous speed). The motor mainly comprises a stator and a rotor, and the direction of forced movement of an electrified wire in a magnetic field is related to the current direction and the direction of a magnetic induction line (magnetic field direction). The motor works in the principle that the magnetic field acts on the current to rotate the motor.
When the first electric energy conversion device (or the second electric energy conversion device) is used as a motor, the motor drives the first roller 311 (or the second roller 321) through the rotor, and then the energy temporary storage piece 21 is lifted from the energy release position to the energy storage position through the traction rope 24; when the first electric energy conversion device (or the second electric energy conversion device) is used as a generator, the traction rope 24 drives the first roller 311 (or the second roller 321) when the energy temporary storage piece 21 descends, and then the rotor cuts the magnetic field of the stator to do work to generate electric energy, and gravitational potential energy of the energy temporary storage piece 21 is finally converted into electric energy of the generator.
Under certain conditions, the generator and the motor are mutually switchable. The motor can be used as a motor or a generator. For example, the most common permanent magnet motor of the new energy automobile is integrated, and can drive wheels and generate electricity. The motor can drive the vehicle and generate electricity, and the BSG motor mounted on the engine is reversible. After three-phase voltages are input to the stator coils, a rotating magnetic field is generated, and the permanent magnet rotor passively rotates under the effect of the same-level repulsion, so that the permanent magnet rotor is used as a motor. When the permanent magnet rotor rotates under the action of external force, current is induced in the three-phase necklace of the stator, and the three-phase necklace is used as a generator. However, the two modes cannot be operated simultaneously, and the motor cannot be used as a generator when used as a motor, and the motor cannot be used as a generator when used as a generator.
In order to improve the electricity-saving effect, reduce the energy loss in the braking process, and feed back the deceleration energy to the power grid, thereby achieving the effects of energy conservation and environmental protection. The first electric energy conversion device and the second electric energy conversion device can adopt a permanent magnet motor provided with a four-quadrant frequency converter, the four-quadrant frequency converter meets various industrial application requirements, and the four-quadrant frequency converter is particularly suitable for occasions needing strong braking effect or occasions needing long-time heavy-duty electric braking, wherein the large-inertia potential energy load such as lifting equipment, the rotational inertia of the equipment is large, the speed reduction and the amplitude reduction from high speed to low speed are large, and the braking time is short.
In an embodiment, when the rotation directions of the first roller 311 and the second roller 321 are opposite, and the energy temporary storage 21 falls from the energy storage position under the action of gravity, the rotation directions of the first roller 311 and the second roller 321 are opposite, so that the first lifter 31 and the second lifter 32 can simultaneously store energy. Of course, in another embodiment, the rotation directions of the first roller 311 and the second roller 321 may be the same, and when the diameters of the first roller 311 and the second roller 321 are the same, the first roller 311 and the second roller 321 may have a certain rotation speed difference. Of course, the diameters of the first roller 311 and the second roller 321 may be different, so long as the winding length of the traction rope 24 on the first roller 311 and the second roller 321 is ensured to have a certain length difference.
To facilitate locking of the energy store 21 in the energy storage position, optionally a first brake is provided on the first roller 311 for braking the first roller 311. The second drum 321 is provided with a second brake for braking the second drum 321. The first brake and the second brake may be hydraulically actuated to provide a sufficient braking force to lock the energy store 21 in the stored energy position. The first lifter 31 further includes a first base 312, the first roller 311 is rotatably disposed on the first base 312, and the first brake is fixedly mounted on the first base 312. The second lifter 32 further includes a second base 322, the second roller 321 is rotatably disposed on the second base 322, and the second brake is fixedly mounted on the second base 322.
In another embodiment, the hoisting machine may be provided with a row, including a plurality of first hoisting machines 31 arranged at one side of the supporting unit 1, the first hoisting machines 31 are connected with one end of the hauling rope 24, and the other end of the hauling rope 24 is fixedly connected to the supporting unit 1. The first hoisting machine 31 includes a first electric energy conversion device and a first drum 311, where the first electric energy conversion device is used to drive the first drum 311 to rotate, and the first electric energy conversion device may be a combination of a generator and a motor, or may be a permanent magnet motor integrated with the generator and the motor.
In this embodiment, both the excess energy and the target energy are electrical energy. In other embodiments, the surplus energy and the target energy may be the kinetic energy, the elastic potential energy, and other energy that is convenient to be converted.
The gravity energy storage system provided by the embodiment stores and releases energy by utilizing gravitational potential energy, stores energy at lower cost, improves the economical efficiency of the whole system, can realize energy storage and power generation by utilizing the gravitational potential energy, and is suitable for storage of renewable energy sources such as wind power, photovoltaic and the like, and power generation application scenes such as peak clipping and valley filling, frequency modulation and phase modulation of a power grid and the like.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (13)
1. A gravity energy storage system, comprising:
a support unit (1);
the energy storage unit (2) comprises an energy temporary storage piece (21) which is arranged on the supporting unit (1) in a height-adjustable mode, and the energy temporary storage piece (21) is provided with an energy release position and an energy storage position;
a conversion unit (3) connected to the energy temporary storage (21);
the conversion unit (3) is used for lifting the energy temporary storage piece (21) from the energy release position to the energy storage position under the drive of excessive energy and locking the energy temporary storage piece (21) at the energy storage position so as to convert the excessive energy into gravitational potential energy of the energy temporary storage piece (21);
the conversion unit (3) is further used for unlocking the energy temporary storage piece (21) at the energy storage position, and the energy temporary storage piece (21) can fall from the energy storage position to the energy release position under the action of gravity so as to convert gravitational potential energy of the energy temporary storage piece (21) into target energy.
2. The gravity energy storage system according to claim 1, wherein the energy storage unit (2) further comprises a fixed pulley (23) and a hauling rope (24), the fixed pulley (23) being arranged on the support unit (1), the hauling rope (24) being wound around the fixed pulley (23), the hauling rope (24) being used for lifting the energy temporary storage (21).
3. The gravity energy storage system according to claim 2, wherein the energy storage unit (2) further comprises a movable pulley (22), the energy temporary storage (21) is arranged on the movable pulley (22), the traction rope (24) is wound on the movable pulley (22) and the fixed pulley (23), and the traction rope (24) is used for lifting the movable pulley (22) so as to lift the energy temporary storage (21).
4. A gravity energy storage system according to claim 3, wherein the energy temporary storage (21) is provided integrally with the travelling block (22) or separately.
5. A gravity energy storage system according to claim 3, characterised in that the energy temporary storage (21), the travelling block (22) and the fixed block (23) are provided in several numbers, respectively.
6. The gravity energy storage system according to claim 2, wherein the conversion unit (3) comprises a hoist for pulling the pulling rope (24) to raise the energy temporary storage (21) from the energy release position to the energy storage position, the hoist further being adapted to convert gravitational potential energy of the energy temporary storage (21) into electrical energy of the hoist.
7. The gravity energy storage system according to claim 6, wherein the hoisting machines are provided with two rows, comprising a number of first hoisting machines (31) and a number of second hoisting machines (32) arranged on both sides of the support unit (1), respectively, one end of the hauling rope (24) is connected with the first hoisting machines (31), and the other end is connected with the second hoisting machines (32).
8. The gravity energy storage system according to claim 7, wherein the first hoisting machine (31) comprises a first electric energy conversion device and a first drum (311), the first electric energy conversion device is used for driving the first drum (311) to rotate, the second hoisting machine (32) comprises a second electric energy conversion device and a second drum (321), the second electric energy conversion device is used for driving the second drum (321) to rotate, one end of the haulage rope (24) is connected with the first drum (311), and the other end is connected with the second drum (321).
9. The gravity energy storage system according to claim 8, wherein the rotation direction of the first roller (311) and the second roller (321) is the same or opposite.
10. The gravity energy storage system according to claim 8, wherein a first brake is provided on the first drum (311), the first brake being used for braking the first drum (311), and a second brake is provided on the second drum (321), the second brake being used for braking the second drum (321).
11. The gravity energy storage system according to claim 6, wherein the hoisting machine is provided with a row comprising a plurality of first hoisting machines (31) arranged at one side of the supporting unit (1), the first hoisting machines (31) are connected with one end of the hauling rope (24), and the other end of the hauling rope (24) is fixedly connected to the supporting unit (1).
12. The gravity energy storage system according to any of the claims 1-11, wherein the support unit (1) comprises a support cross beam (11), a support vertical beam (12) and a reinforcement rib (13), the support cross beam (11) and the support vertical beam (12) being arranged vertically, the reinforcement rib (13) being arranged obliquely to the support cross beam (11) and the support vertical beam (12), respectively.
13. The gravity energy storage system according to any of claims 1-11, wherein the surplus energy comprises electrical energy and/or the target energy comprises electrical energy.
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