CN113726020B - Large-scale gravity energy storage system - Google Patents

Large-scale gravity energy storage system Download PDF

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Publication number
CN113726020B
CN113726020B CN202111038584.8A CN202111038584A CN113726020B CN 113726020 B CN113726020 B CN 113726020B CN 202111038584 A CN202111038584 A CN 202111038584A CN 113726020 B CN113726020 B CN 113726020B
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track
energy storage
low
level
descending
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CN113726020A (en
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张鲁
寇宝泉
黄昌闯
葛庆稳
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Harbin Institute of Technology
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Harbin Institute of Technology
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J15/00—Systems for storing electric energy
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
    • F03G3/00—Other motors, e.g. gravity or inertia motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28—Arrangements for balancing of the load in a network by storage of energy
    • 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
    • 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
    • Y02E70/00—Other energy conversion or management systems reducing GHG emissions
    • Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Current-Collector Devices For Electrically Propelled Vehicles (AREA)

Abstract

A large-scale gravity energy storage system belongs to the technical field of energy storage and motor application. The problem of current gravity energy storage system energy conversion inefficiency, and need additional configuration palletizing robot and transfer robot, lead to system structure complicated is solved. The invention comprises a high-level platform, a low-level platform, a 4-section track, a No. 1 frequency converter, an ascending transmission mechanism, a descending transmission mechanism, a motor, a generator and a standard trolley; energy storage stage: the motor drives the standard trolley to move from bottom to top to the spiral track by driving the ascending transmission mechanism to move after the excessive electric energy output by the external renewable energy source is converted into potential energy to be stored; and (3) power generation stage: the standard trolley moves along the descending track from top to bottom to drive the descending conveying mechanism to move, and the generator is driven to rotate by the movement of the descending conveying mechanism, so that the generator can generate electricity. The device is mainly used for energy storage, peak regulation and frequency modulation of a power grid and the like.

Description

Large-scale gravity energy storage system
Technical Field
The invention belongs to the technical field of energy storage and motor application.
Background
Energy and environmental problems have become major problems facing global sustainable development, increasingly attracting attention from international society, and seeking active countermeasures. At present, the improvement of the energy utilization rate, the development and the utilization of renewable energy sources, the protection of ecological environment and the realization of sustainable development become the common actions of the international society. Renewable energy sources such as wind energy, solar energy and tidal current energy are green and clean, but generally have the defects of poor regularity, large fluctuation and the like, and are difficult to keep consistent with the real-time trend of electricity demand. With the rapid development of new energy and energy Internet, the installed capacity of renewable energy in China is continuously enlarged, but the problems of shortage of power supply and difficulty in peak shaving of a power grid are increasingly highlighted, and urgent demands are put forward for large-scale power energy storage technology in the power industry.
Along with the increasing scale of renewable energy power generation, in order to truly make the energy storage technology play a role in boosting in energy structure transformation, people have to search for a new energy storage form; however, the gravity energy storage system in the prior art has the problems of difficult site selection and low energy conversion efficiency, and when the gravity energy storage system is applied specifically, after heavy objects are transported to a high place or a low place, a stacking robot and a carrying robot are additionally arranged for placing the heavy objects so as to be ready for the application of charging and discharging in the next stage, and the gravity energy storage system with the additional stacking robot and the carrying robot is complex in structure and inconvenient to maintain, so that the problems are needed to be solved.
Disclosure of Invention
The invention aims to solve the problems that the existing gravity energy storage system is low in energy conversion efficiency, and a palletizing robot and a carrying robot are additionally arranged, so that the system structure is complex.
The large-scale gravity energy storage system comprises a high-level platform, a low-level platform, a 4-section track, a No. 1 frequency converter, a descending conveying mechanism, a ascending conveying mechanism, a generator, a motor and a standard trolley, wherein the standard trolley is in sliding connection with the 4-section track;
the 4-section track comprises a closed track consisting of an uplink track, a downlink track, a spiral track and a low-level track; the spiral track is positioned above the uplink track and the downlink track and is arranged on the high-level platform; the low-level track is positioned below the uplink track and the downlink track and is arranged on the low-level platform;
the spiral track spirals along the vertical direction, and the inlet end of the spiral track is positioned above the outlet end of the spiral track;
the inlet end of the uplink track is positioned below the outlet end of the uplink track;
the inlet end of the descending track is positioned above the outlet end of the descending track, and the inlet end of the descending track is provided with a blocking mechanism for blocking the standard trolley;
the inlet end of the low-level track is positioned above the outlet end of the low-level track;
a slope is formed between the high-level platform and the low-level platform, an uplink track and a downlink track are paved on the slope in parallel, the outlet end of the uplink track is connected with the inlet end of the spiral track, the outlet end of the spiral track is connected with the inlet end of the downlink track, the outlet end of the downlink track is connected with the inlet end of the low-level track, and the outlet end of the low-level track is connected with the inlet end of the uplink track;
in the energy storage stage: the motor drives the lifting conveying mechanism to move so as to drive the standard trolley to move from bottom to top, so that the standard trolley moves from a low-level track to a spiral track and is blocked by the blocking mechanism;
in the power generation stage: the standard trolley moves from top to bottom along the descending track, the descending conveying mechanism is driven by the movement of the standard trolley to move, and the generator is driven to rotate by the movement of the descending conveying mechanism, so that the generator is used for generating electricity.
Preferably, the lower track is a semi-circular track.
Preferably, the ascending track and the descending track are both linear tracks.
Preferably, the lifting and conveying mechanism comprises a closure cable No. 1, a winch No. 1 and a pulley No. 1;
the No. 1 closing cable is sleeved on the No. 1 winch and the No. 1 pulley, is in close contact with the No. 1 winch and the No. 1 pulley, and is in sliding connection relative to the No. 1 winch and the No. 1 pulley;
the rotating shaft of the motor is fixedly connected with the driving shaft of the No. 1 winch;
the standard trolley is hung on the No. 1 closing cable and moves along with the No. 1 closing cable.
Preferably, the descent transfer mechanism comprises a closure cable No. 2, a winch No. 2, and a pulley No. 2;
the No. 2 closing cable is sleeved on the No. 2 winch and the No. 2 pulley, is in close contact with the No. 2 winch and the No. 2 pulley, and is in sliding connection relative to the No. 2 winch and the No. 2 pulley;
the rotating shaft of the generator is fixedly connected with the driving shaft of the No. 2 winch;
the standard trolley is hung on a No. 2 closing cable and moves along with the No. 2 closing cable.
Preferably, the large-scale gravity energy storage system further comprises a No. 2 frequency converter, and the electric energy output by the generator is transmitted to the power grid after being converted by the No. 2 frequency converter.
Preferably, the external renewable energy power generation unit is a photovoltaic power generation system or a wind power generation system.
Preferably, the large scale gravity energy storage system further comprises a controller for controlling the motor and the generator.
The beneficial effects brought by the invention are as follows: (1) The invention uses the spiral track (1-3) with a certain height difference at the inlet and outlet ends, so that the spiral track (1-3) can be automatically queued for conveying, and an externally configured palletizing robot and a conveying robot are avoided; (2) The large-scale gravity energy storage system has small occupied area, flexible site selection and low construction cost, and can be used in desert or gobi areas; (3) The large-scale gravity energy storage system has the advantages of long service life, high conversion efficiency, good reliability and high safety coefficient.
When the large-scale gravity energy storage system is particularly applied, the large-scale gravity energy storage system is matched with a photovoltaic power generation or wind power generation system in a desert area, renewable energy sources can be fully utilized, the phenomena of wind abandoning and light abandoning are reduced, and meanwhile, the energy source structure can be assisted to upgrade, and the peak shaving and frequency modulation of a power grid are facilitated.
Drawings
Fig. 1 is a schematic view of the structure of the descent conveyor mechanism 3 according to the present invention;
fig. 2 is a schematic structural view of the ascending transfer mechanism 4 according to the present invention;
FIG. 3 is a schematic diagram of a large scale gravity energy storage system according to the present invention;
fig. 4 is a schematic diagram of a 4-segment track 1;
FIG. 5 is a schematic view of the structure of the spiral track 1-3;
fig. 6 is a schematic view of the structure of the lower rails 1 to 4.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described 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 be within the scope of the invention.
It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.
Referring to fig. 1 to 4, the large-scale gravity energy storage system according to the present embodiment includes a high-level platform, a low-level platform, a 4-section track 1, a No. 1 frequency converter 2, a descending conveying mechanism 3, a ascending conveying mechanism 4, a generator 5, a motor 6 and a standard trolley 7, wherein the standard trolley 7 is slidably connected with the 4-section track 1;
the 4-section track 1 comprises a closed track consisting of an ascending track 1-1, a descending track 1-2, a spiral track 1-3 and a low-level track 1-4; the spiral track 1-3 is positioned above the uplink track 1-1 and the downlink track 1-2 and is arranged on the high-level platform; the low-level track 1-4 is positioned below the uplink track 1-1 and the downlink track 1-2 and is arranged on the low-level platform;
the spiral track 1-3 spirals along the vertical direction, and the inlet end of the spiral track 1-3 is positioned above the outlet end of the spiral track;
the inlet end of the uplink track 1-1 is positioned below the outlet end of the uplink track;
the inlet end of the descending track 1-2 is positioned above the outlet end of the descending track, and the inlet end of the descending track 1-2 is provided with a blocking mechanism for blocking the standard trolley 7;
the inlet ends of the low-level rails 1-4 are positioned above the outlet ends of the low-level rails;
a slope is formed between the high-level platform and the low-level platform, an uplink track 1-1 and a downlink track 1-2 are paved on the slope in parallel, the outlet end of the uplink track 1-1 is connected with the inlet end of a spiral track 1-3, the outlet end of the spiral track 1-3 is connected with the inlet end of the downlink track 1-2, the outlet end of the downlink track 1-2 is connected with the inlet end of a low-level track 1-4, and the outlet end of the low-level track 1-4 is connected with the inlet end of the uplink track 1-1;
in the energy storage stage: the excessive electric energy output by the external renewable energy power generation unit 8 is converted by the No. 1 frequency converter 2 and then supplies power to the motor 6, the motor 6 drives the standard trolley 7 to move from bottom to top by driving the ascending transmission mechanism 4, and the standard trolley 7 is blocked by the blocking mechanism after moving from the low-level track 1-4 to the spiral track 1-3;
in the power generation stage: the standard trolley 7 moves along the descending track 1-2 from top to bottom, the movement of the standard trolley 7 drives the descending conveying mechanism 3 to move, and the generator 5 is driven to rotate by the movement of the descending conveying mechanism 3, so that the generator 5 generates electricity.
In the embodiment, the inlet and outlet ends of the spiral tracks 1-3 and the low-level tracks 1-4 are provided with height differences, and the external renewable energy power generation unit 8 is renewable energy;
in the energy storage stage: the standard trolley 7 is sequentially pulled up to the top end of the spiral track 1-3 on the high-level platform from the low-level track 1-4 and the uplink track 1-1 on the low-level platform, electric energy is converted into potential energy to be stored, at the moment, the standard trolley 7 is separated from the No. 1 closed cable 4-1, the standard trolley 7 pulled up to the top end of the spiral track 1-3 can automatically gather to the inlet end of the downlink track 1-2 from the upper layer of the spiral track 1-3 along the spiral track 1-3 on the high-level platform, and the blocking mechanism is used for blocking the lower layer of the spiral track 1-3, so that the standard trolley 7 is prevented from being additionally provided with a stacking robot and a carrying robot to be stacked;
in the power generation stage: the standard trolley 7 converged at the entrance of the descending track 1-2 is released, slides down to the lower track 1-4 along the descending track 1-2, and drives the descending conveying mechanism 3 to move through the movement of the standard trolley 7, so that the descending conveying mechanism 3 drags the generator 5 to stably operate, and a power grid is conducted; because the altitude of the inlet end of the low-level track 1-4 on the low-level platform is higher than that of the inlet end of the ascending track 1-1, the standard trolley 7 can automatically gather to the inlet of the ascending track 1-1 along the track and wait for being used when storing energy again, and the stacking robot and the carrying robot are also prevented from being additionally configured to stack the standard trolley 7, so that the construction cost is saved, the complexity of the system is reduced, and the reliability of the system is improved.
The large-scale gravity energy storage system has the advantages of simple structure, convenient assembly, small occupied area, low construction cost, long service life, high conversion efficiency, good reliability and high safety coefficient, can assist a power grid to realize smooth output, eliminate peak-valley difference, peak regulation, frequency modulation and spare capacity, meets the requirements of stable and safe power generation of new energy sources and power grid access, and can effectively reduce phenomena such as wind abandoning, light abandoning and the like.
The novel large-scale gravity energy storage system provided by the invention has the advantages of simple structure, realization of modularized design, convenience in assembly, flexible site selection, and capability of adjusting the track gradient and the trolley number according to the needs during application;
the large-scale gravity energy storage system has the advantages of low construction cost, convenient maintenance, high energy conversion efficiency and good reliability and stability. The device is matched with a photovoltaic power generation or wind power generation system in a desert area, can fully utilize renewable energy sources, reduce the phenomena of wind abandoning and light abandoning, and can assist in energy structure upgrading and help in peak shaving and frequency modulation of a power grid.
Further, referring specifically to fig. 6, the lower rails 1-4 are semi-circular rails.
Further, the ascending track 1-1 and the descending track 1-2 are both linear tracks.
Still further, with particular reference to FIG. 2, the ascent transfer mechanism 4 includes a closure cable No. 1 4-1, a winch No. 1 4-2, and a pulley No. 1 4-3;
the No. 1 closing cable 4-1 is sleeved on the No. 1 winch 4-2 and the No. 1 pulley 4-3, is in close contact with the No. 1 winch 4-2 and the No. 1 pulley 4-3, and is in sliding connection relative to the two;
the rotating shaft of the motor 6 is fixedly connected with the driving shaft of the No. 1 winch 4-2;
the standard trolley 7 is hung on the No. 1 closing cable 4-1 and moves along with the No. 1 closing cable 4-1.
In the preferred embodiment, the ascending and conveying mechanism 4 has a simple structure and is convenient to realize.
Still further, with particular reference to FIG. 1, the descent transfer mechanism 3 includes a closure cable No. 2 3-1, a winch No. 2 3-2, and a pulley No. 2 3-3;
the No. 2 closing cable 3-1 is sleeved on the No. 2 winch 3-2 and the No. 2 pulley 3-3, is in close contact with the No. 2 winch 3-2 and the No. 2 pulley 3-3, and is in sliding connection relative to the two;
the rotating shaft of the generator 5 is fixedly connected with the driving shaft of the No. 2 winch 3-2;
the standard trolley 7 is hung on the No. 2 closing cable 3-1 and moves along with the No. 2 closing cable 3-1.
In the preferred embodiment, the descending conveying mechanism 3 has a simple structure and is convenient to realize.
Still further, referring specifically to fig. 3, the large-scale gravity energy storage system further includes a No. 2 frequency converter 9, and the electric energy output by the generator 5 is sent to the power grid after being converted by the No. 2 frequency converter 9.
Further, the external renewable energy power generation unit 8 is a photovoltaic power generation system or a wind power generation system.
Still further, the large scale gravity energy storage system further comprises a controller for controlling the motor 6 and the generator 5.
Principle analysis: when the external renewable energy power generation unit 8 generates surplus energy, the surplus electric quantity is supplied to the motor 6, the motor 6 rotates to work together through the No. 1 winch 4-2 and the No. 1 closed cable 4-1, a plurality of standard trolleys 7 with standard weight are sequentially pulled up to the top end of the spiral track 1-3 on the high-level platform from the low-level track 1-4 and the ascending track 1-1 on the low-level platform, electric energy is converted into potential energy to be stored, at the moment, the standard trolleys 7 are separated from the No. 1 closed cable 4-1, and the standard trolleys 7 pulled up to the top end of the spiral track 1-3 can automatically gather to the inlet end of the descending track 1-2 along the spiral track 1-3 at the upper layer of the high-level platform by virtue of the blocking mechanism, and the power generator 5 stands by, so that stacking robots and carrying robots are prevented from being additionally arranged to stack the standard trolleys 7.
When the electric quantity of the power grid is in a vacancy and needs power utilization suddenly, the standard trolley 7 converged at the lower-layer generator 5 of the high-level platform is sequentially released and slides downwards to the low-level track 1-4 along the descending track 1-2, and the generator 5 is dragged by the No. 2 closing cable 3-1 and the No. 2 winch 3-2 to stably operate to supply power for the power grid in the sliding process; meanwhile, as the altitude of the inlet end of the low-level track 1-4 on the low-level platform is higher than that of the inlet end of the ascending track 1-1, the standard trolley 7 can automatically gather to the inlet of the ascending track 1-1 along the track and is used when waiting for storing energy again, and the standard trolley 7 is prevented from being piled up by additionally configuring a piling robot and a carrying robot.
The large-scale gravity energy storage system has the advantages of simple structure, flexible site selection, low construction cost, short construction period, convenient maintenance, safe and reliable work and long service life, and can utilize the areas with rare human cigarettes such as barren mountains, gobi, deserts and the like; the energy storage device can realize large-scale energy storage, has higher energy density and high energy circulation efficiency, and can realize safe storage and uniform output of electric power.
Although the invention herein has been described with reference to particular embodiments, it is to be understood that these embodiments are merely illustrative of the principles and applications of the present invention. It is therefore to be understood that numerous modifications may be made to the illustrative embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the different dependent claims and the features described herein may be combined in ways other than as described in the original claims. It is also to be understood that features described in connection with separate embodiments may be used in other described embodiments.

Claims (8)

1. The large-scale gravity energy storage system is characterized by comprising a high-level platform, a low-level platform, a 4-section track (1), a No. 1 frequency converter (2), a descending conveying mechanism (3), a lifting conveying mechanism (4), a generator (5), a motor (6) and a standard trolley (7), wherein the standard trolley (7) is in sliding connection with the 4-section track (1);
the 4-section track (1) comprises a closed track consisting of an uplink track (1-1), a downlink track (1-2), a spiral track (1-3) and a low-level track (1-4); the spiral track (1-3) is positioned above the uplink track (1-1) and the downlink track (1-2) and is arranged on the high-level platform; the low-level track (1-4) is positioned below the uplink track (1-1) and the downlink track (1-2) and is arranged on the low-level platform;
the spiral track (1-3) spirals along the vertical direction, and the inlet end of the spiral track (1-3) is positioned above the outlet end of the spiral track;
the inlet end of the ascending track (1-1) is positioned below the outlet end of the ascending track;
the inlet end of the descending track (1-2) is positioned above the outlet end of the descending track, and the inlet end of the descending track (1-2) is provided with a blocking mechanism for blocking the standard trolley (7);
the inlet end of the low-level track (1-4) is positioned above the outlet end of the low-level track;
a slope is formed between the high-level platform and the low-level platform, an uplink track (1-1) and a downlink track (1-2) are paved on the slope in parallel, the outlet end of the uplink track (1-1) is connected with the inlet end of a spiral track (1-3), the outlet end of the spiral track (1-3) is connected with the inlet end of the downlink track (1-2), the outlet end of the downlink track (1-2) is connected with the inlet end of a low-level track (1-4), and the outlet end of the low-level track (1-4) is connected with the inlet end of the uplink track (1-1);
in the energy storage stage: the excessive electric energy output by the external renewable energy power generation unit (8) is converted by the No. 1 frequency converter (2) and then is supplied to the motor (6), the motor (6) drives the standard trolley (7) to move from bottom to top by driving the ascending transmission mechanism (4) to move, and the standard trolley (7) is blocked by the blocking mechanism after moving from the low-level track (1-4) to the spiral track (1-3);
in the power generation stage: the standard trolley (7) moves from top to bottom along the descending track (1-2), the movement of the standard trolley (7) drives the descending conveying mechanism (3) to move, and the generator (5) is driven to rotate through the movement of the descending conveying mechanism (3), so that the generator (5) can generate electricity.
2. The large scale gravity energy storage system according to claim 1, wherein the low level rails (1-4) are semi-circular rails.
3. The large scale gravity energy storage system according to claim 1, wherein the up-track (1-1) and the down-track (1-2) are both rectilinear tracks.
4. The large scale gravity energy storage system according to claim 1, wherein the lifting transfer mechanism (4) comprises a closure cable No. 1 (4-1), a winch No. 1 (4-2) and a pulley No. 1 (4-3);
the No. 1 closing cable (4-1) is sleeved on the No. 1 winch (4-2) and the No. 1 pulley (4-3), is tightly contacted with the No. 1 winch (4-2) and the No. 1 pulley (4-3), and is in sliding connection relative to the two;
the rotating shaft of the motor (6) is fixedly connected with the driving shaft of the No. 1 winch (4-2);
the standard trolley (7) is hung on the No. 1 closing cable (4-1) and moves along with the No. 1 closing cable (4-1).
5. The large scale gravity energy storage system according to claim 1, wherein the descent transfer mechanism (3) comprises a No. 2 closing cable (3-1), a No. 2 winch (3-2) and a No. 2 pulley (3-3);
the No. 2 closing cable (3-1) is sleeved on the No. 2 winch (3-2) and the No. 2 pulley (3-3), is tightly contacted with the No. 2 winch (3-2) and the No. 2 pulley (3-3), and is in sliding connection relative to the two;
the rotating shaft of the generator (5) is fixedly connected with the driving shaft of the No. 2 winch (3-2);
the standard trolley (7) is hung on the No. 2 closing cable (3-1) and moves along with the No. 2 closing cable (3-1).
6. The large-scale gravity energy storage system according to claim 1, further comprising a No. 2 frequency converter (9), wherein the electric energy output by the generator (5) is sent to the power grid after being converted by the No. 2 frequency converter (9).
7. The large scale gravity energy storage system according to claim 1, wherein the external renewable energy power generation unit (8) is a photovoltaic power generation system or a wind power generation system.
8. The large scale gravity energy storage system according to claim 1, further comprising a controller for controlling the motor (6) and the generator (5).
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