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

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 technique

Energy and environmental issues have become the main issues facing global sustainable development, increasingly attracting widespread attention from the international community and seeking active countermeasures. At present, improving energy utilization efficiency, developing and utilizing renewable energy, protecting the ecological environment, and achieving sustainable development have become common actions of the international community. Although renewable energy sources such as wind energy, solar energy, and tidal current energy are green and clean, they usually have shortcomings such as poor regularity and large fluctuations, making it difficult to keep pace with the real-time trend of electricity demand. With the rapid development of new energy and energy Internet, my country's renewable energy installed capacity continues to expand. However, the problems of tight power supply and difficulties in peak load regulation of the power grid have become increasingly prominent. The power industry has put forward urgent needs for large-scale power energy storage technology.

As the scale of renewable energy power generation becomes larger and larger, in order for energy storage technology to truly play a role in promoting the transformation of the energy structure, people have to find new forms of energy storage; however, gravity energy storage in existing technology The system has difficulties in site selection and low energy conversion efficiency. In specific applications, after transporting heavy objects to high or low places, additional palletizing robots and handling robots are required to place the heavy objects in preparation for the next stage of charging. For the application of discharge, this kind of gravity energy storage system that requires additional palletizing robots and handling robots has a complex structure and is inconvenient to maintain. Therefore, the above problems need to be solved urgently.

Contents of the invention

The purpose of the invention is to solve the problem that the existing gravity energy storage system has low energy conversion efficiency and requires additional configuration of palletizing robots and handling robots, resulting in a complex system structure. The invention provides a large-scale gravity energy storage system with a simpler structure. Energy storage system.

Large-scale gravity energy storage system, including high-level platform, low-level platform, 4-section track, No. 1 frequency converter, descending transmission mechanism, ascending transmission mechanism, generator, electric motor and standard trolley. The standard trolley is slidingly connected to the 4-section track;

Among them, the 4-section track includes a closed track composed of an upward track, a downward track, a spiral track and a low track; the spiral track is located above the up track and the down track and is set on a high platform; the low track is located on the up track and Below the descending track and set on a low platform;

The spiral track rotates in a vertical direction, and the entrance end of the spiral track is located above its exit end;

The entrance end of the ascending track is located below its exit end;

The entrance end of the descending track is located above its exit end, and a blocking mechanism is provided at the entrance end of the descending track to block the standard trolley;

The entrance end of the low-level track is located above its exit end;

A slope is formed between the high platform and the low platform. The upward track and the downward track are laid in parallel on the slope. The exit end of the upward track is connected to the entrance end of the spiral track, and the exit end of the spiral track is connected to the entrance end of the downward track. , the exit end of the down track is connected to the entrance end of the low track, and the exit end of the low track is connected to the entrance end of the up track;

In the energy storage stage: The excess electric energy output by the external renewable energy power generation unit is converted by the No. 1 frequency converter to power the motor. The motor drives the standard car to move from bottom to top by driving the upward transmission mechanism, causing the standard car to move from the low track to the spiral After being on the track, it is blocked by the blocking mechanism;

In the power generation stage: the standard trolley moves from top to bottom along the downward track. The movement of the standard trolley drives the movement of the descending transmission mechanism, and drives the generator to rotate through the movement of the descending transmission mechanism, thereby realizing the generator to generate electricity.

Preferably, the lower orbit is a semi-circular orbit.

Preferably, both the upward track and the downward track are linear tracks.

Preferably, the ascending transmission mechanism includes No. 1 closing cable, No. 1 winch and No. 1 pulley;

The No. 1 closed cable is set on the No. 1 winch and the No. 1 pulley, and is in close contact with the No. 1 winch and the No. 1 pulley, and is slidingly connected to them;

The rotating shaft of the motor is fixedly connected to the drive shaft of the No. 1 winch;

The standard trolley is attached to the No. 1 closing cable and follows the movement of the No. 1 closing cable.

Preferably, the descending transmission mechanism includes No. 2 closing cable, No. 2 winch and No. 2 pulley;

The No. 2 closed cable is set on the No. 2 winch and the No. 2 pulley, and is in close contact with the No. 2 winch and the No. 2 pulley, and is slidingly connected to them;

The rotating shaft of the generator is fixedly connected to the drive shaft of the No. 2 winch;

The standard trolley is attached to the No. 2 closing cable and follows the movement of the No. 2 closing cable.

Preferably, the large-scale gravity energy storage system also includes a No. 2 frequency converter. The output electric energy of the generator is converted by the No. 2 frequency converter and then sent to the power grid.

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 also includes a controller for controlling the motor and the generator.

The beneficial effects brought by the present invention are: (1) Since the present invention uses a spiral track (1-3) with a certain height difference between the inlet and outlet ends, the transportation to the spiral track (1-3) can be queued by itself. , avoiding the use of external palletizing robots and handling robots, making the large-scale gravity energy storage system of the present invention simple in structure, enabling modular design and easy assembly, and the number and slope of the conveyor rails can be adjusted as needed; (2) The present invention The large-scale gravity energy storage system occupies a small area, has flexible location selection, and low construction cost, and can be used in desert or Gobi areas; (3) The large-scale gravity energy storage system of the present invention has a long service life, high conversion efficiency, good reliability, and safety The coefficient is high.

In specific applications, the large-scale gravity energy storage system of the present invention is matched with the photovoltaic power generation or wind power generation system in desert areas, which can make full use of renewable energy, reduce the phenomenon of wind and light abandonment, and can also assist the energy structure upgrade and help the power grid peak regulation. ,FM.

Description of the drawings

Figure 1 is a schematic structural diagram of the descending transmission mechanism 3 of the present invention;

Figure 2 is a schematic structural diagram of the ascending transmission mechanism 4 according to the present invention;

Figure 3 is a schematic diagram of the principle of the large-scale gravity energy storage system according to the invention;

Figure 4 is a schematic diagram of the principle of the 4-section track 1;

Figure 5 is a schematic structural diagram of the spiral track 1-3;

Figure 6 is a schematic structural diagram of the low-level track 1-4.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without any creative work fall within the scope of protection of the present invention.

It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

Refer to Figures 1 to 4 to illustrate this embodiment. The large-scale gravity energy storage system described in this embodiment includes a high platform, a low platform, a 4-section track 1, a No. 1 frequency converter 2, a descending transmission mechanism 3, and an ascending transmission Mechanism 4, generator 5, motor 6 and standard trolley 7, the standard trolley 7 is slidingly connected to the 4-section track 1;

Among them, the 4-section track 1 includes a closed track composed of an upward track 1-1, a downward track 1-2, a spiral track 1-3 and a low track 1-4; the spiral track 1-3 is located on the upward track 1-1 and above the descending track 1-2, and are set on the high platform; the low track 1-4 is located below the upgoing track 1-1 and the descending track 1-2, and is set on the low platform;

The spiral track 1-3 rotates in a vertical direction, and the entrance end of the spiral track 1-3 is located above its exit end;

The entrance end of the upward track 1-1 is located below its exit end;

The entrance end of the downward track 1-2 is located above its exit end, and the entrance end of the downward track 1-2 is provided with a blocking mechanism for blocking the standard trolley 7;

The entrance ends of the low-level tracks 1-4 are located above their exit ends;

A slope is formed between the high platform and the low platform. The upward track 1-1 and the downward track 1-2 are laid in parallel on the slope, and the exit end of the upward track 1-1 is connected to the entrance end of the spiral track 1-3. The exit end of the track 1-3 is connected to the entrance end of the down track 1-2, the exit end of the down track 1-2 is connected to the entrance end of the low track 1-4, and the exit end of the low track 1-4 is connected to the up track 1 -1 entry port connection;

In the energy storage stage: the excess electric energy output by the external renewable energy power generation unit 8 is converted by the No. 1 frequency converter 2 to supply power to the motor 6. The motor 6 drives the standard trolley 7 to move from bottom to top by driving the upward transmission mechanism 4 to move the standard trolley. 7 After moving from the low track 1-4 to the spiral track 1-3, it is blocked by the blocking mechanism;

In the power generation stage: the standard trolley 7 moves from top to bottom along the downward track 1-2. The movement of the standard trolley 7 drives the movement of the descending transmission mechanism 3, and drives the generator 5 to rotate through the movement of the descending transmission mechanism 3, thereby realizing the generator 5 to generate electricity. .

In this embodiment, the entrance and exit ends of the spiral rails 1-3 and the low-level rails 1-4 are provided with height differences, and the external renewable energy power generation unit 8 is a renewable energy source;

In the energy storage stage: the standard car 7 is pulled up from the low track 1-4 and the upward track 1-1 on the low platform to the top of the spiral track 1-3 on the high platform, and the electric energy is converted into potential energy and stored. When the standard trolley 7 is separated from the No. 1 closing cable 4-1, the standard trolley 7 pulled up to the top of the spiral track 1-3 will automatically gather from its upper level to its lower level along the spiral track 1-3 at the high platform. It is blocked by the blocking mechanism at the entrance end of the descending track 1-2 to avoid additional deployment of palletizing robots and handling robots to stack the standard trolley 7;

In the power generation stage: the standard trolleys 7 gathered at the entrance of the downward track 1-2 are released, and slide down along the downward track 1-2 to the low track 1-4. The movement of the standard trolley 7 drives the downward transmission mechanism 3 to move, thereby causing The descending transmission mechanism 3 drives the generator 5 to operate stably and performs the power grid; since the altitude of the entrance end of the low track 1-4 on the low platform is higher than the altitude of the entrance end of the upward track 1-1, the standard trolleys 7 will converge along the track on their own To the entrance of the uplink track 1-1, it is used when waiting for energy storage again. It also avoids the additional configuration of palletizing robots and handling robots to stack the standard trolley 7, saving construction costs, reducing system complexity, and improving system reliability.

The large-scale gravity energy storage system described in the present invention has a simple structure, is easy to assemble, occupies a small area, has low construction cost, has a long service life, has high conversion efficiency, good reliability and high safety factor, and can assist the power grid to achieve smooth output, eliminate Day and night peak and valley differences, peak and frequency regulation and reserve capacity meet the needs of new energy power generation for stable and safe access to the power grid, and can effectively reduce wind and light curtailment.

The new large-scale gravity energy storage system proposed by the present invention has a simple structure, can realize modular design, is easy to assemble, and has flexible location selection. During application, the track slope and the number of trolleys can be adjusted as needed;

The large-scale gravity energy storage system of the present invention has low construction cost, convenient maintenance, high energy conversion efficiency, and good reliability and stability. When matched with photovoltaic power generation or wind power generation systems in desert areas, it can make full use of renewable energy and reduce wind and light abandonment. It can also assist in upgrading the energy structure and help power grid peak regulation and frequency regulation.

Further, specifically referring to Figure 6, the low orbits 1-4 are semi-circular orbits.

Furthermore, both the upward track 1-1 and the downward track 1-2 are linear tracks.

Further, specifically referring to Figure 2, the ascending transmission mechanism 4 includes a No. 1 closing cable 4-1, a No. 1 winch 4-2 and a No. 1 pulley 4-3;

The No. 1 closed cable 4-1 is set on the No. 1 winch 4-2 and the No. 1 pulley 4-3, and is in close contact with the No. 1 winch 4-2 and the No. 1 pulley 4-3, and is slidingly connected to them. ;

The rotating shaft of the motor 6 is fixedly connected to the drive shaft of the No. 1 winch 4-2;

The standard trolley 7 is connected to the No. 1 closing cable 4-1 and follows the movement of the No. 1 closing cable 4-1.

In this preferred embodiment, the ascending transmission mechanism 4 has a simple structure and is easy to implement.

Further, specifically referring to Figure 1, the descending transmission mechanism 3 includes the No. 2 closing cable 3-1, the No. 2 winch 3-2 and the No. 2 pulley 3-3;

The No. 2 closing cable 3-1 is set on the No. 2 winch 3-2 and the No. 2 pulley 3-3, and is in close contact with the No. 2 winch 3-2 and the No. 2 pulley 3-3, and is slidingly connected to them. ;

The rotating shaft of the generator 5 is fixedly connected to the drive shaft of the No. 2 winch 3-2;

The standard trolley 7 is connected to the No. 2 closing cable 3-1 and follows the movement of the No. 2 closing cable 3-1.

In this preferred embodiment, the descending transmission mechanism 3 has a simple structure and is easy to implement.

Furthermore, see Figure 3 for details. The large-scale gravity energy storage system also includes a No. 2 inverter 9. The electric energy output by the generator 5 is converted by the No. 2 inverter 9 and then sent to the power grid.

Furthermore, the external renewable energy power generation unit 8 is a photovoltaic power generation system or a wind power generation system.

Furthermore, the large-scale gravity energy storage system also includes a controller, which is used to control the motor 6 and the generator 5 .

Principle analysis: In specific applications, when the power generated by the external renewable energy power generation unit 8 is surplus, the surplus power is supplied to the motor 6. The motor 6 rotates through the No. 1 winch 4-2 and the No. 1 closing cable 4-1 to work together. Several standard trolleys 7 of standard weight are sequentially pulled up from the low track 1-4 and the upward track 1-1 on the low platform to the top of the spiral track 1-3 on the high platform, converting the electrical energy into potential energy and storing it. , the standard trolley 7 is separated from the No. 1 closing cable 4-1, and the standard trolley 7 that is pulled up to the top of the spiral track 1-3 will automatically gather from its upper level to its lower level along the spiral track 1-3 at the high platform. The blocking mechanism is blocked at the entrance end of the descending track 1-2, and the generator 5 is on standby to prevent additional palletizing robots and handling robots from stacking the standard trolley 7.

When there is a vacancy in the power grid and urgent need for electricity, the standard trolleys 7 gathered at the generator 5 on the lower level of the high-level platform are released in sequence and slide down the downward track 1-2 to the low-level track 1-4. During the descent, the No. 2 closing cable 3- Winches 1 and 2 drive the generator 5 to operate stably to supply power to the power grid; at the same time, because the altitude of the entrance end of the low track 1-4 on the low platform is higher than the altitude of the entrance end of the upstream track 1-1, the standard trolley 7 will automatically gather along the track to the entrance of the upward track 1-1, waiting for use when energy is stored again, avoiding the need for additional palletizing robots and handling robots to stack standard trolleys 7.

The large-scale gravity energy storage system of the present invention has a simple structure, flexible site selection, and can utilize sparsely populated areas such as barren mountains, Gobis, and deserts. It has low construction cost, short construction period, convenient maintenance, safe and reliable operation, and long service life; it can realize large-scale The energy storage has high energy density and high energy circulation efficiency, which can achieve safe storage and uniform output of electricity.

Although the present invention is described herein with reference to specific embodiments, it is to be understood that these embodiments are merely exemplary of the principles and applications of the invention. It is therefore to be understood that many modifications may be made to the exemplary embodiments and other arrangements may be devised without departing from the spirit and scope of the invention as defined by the appended claims. It is to be understood that the features described in the different dependent claims may be combined in a different manner than that described in the original claims. It will also be understood that features described in connection with individual embodiments can be used in other described embodiments.

Claims (8)

1. Large-scale gravity energy storage system, characterized by including a high-level platform, a low-level platform, a 4-section track (1), No. 1 frequency converter (2), a descending transmission mechanism (3), an ascending transmission mechanism (4), Generator (5), electric motor (6) and standard trolley (7), the standard trolley (7) is slidingly connected to the 4-section track (1); Among them, the 4-section track (1) includes a closed track composed 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 The track (1-3) is located above the up track (1-1) and the down track (1-2) and is set on the high platform; the low track (1-4) is located on the up track (1-1) and the down track (1-2) below and set on a low platform; The spiral track (1-3) rotates in a vertical direction, and the entrance end of the spiral track (1-3) is located above its exit end; The entrance end of the ascending track (1-1) is located below its exit end; The entrance end of the downward track (1-2) is located above its exit end, and the entrance end of the downward track (1-2) is provided with a blocking mechanism for blocking the standard trolley (7); The inlet end of the low track (1-4) is located above its outlet end; A slope is formed between the high platform and the low platform. The upward track (1-1) and the downward track (1-2) are laid in parallel on the slope, and the exit end of the uprail (1-1) is in contact with the spiral track (1-2). The entrance end of 3) is connected, the exit end of the spiral track (1-3) is connected with the entrance end of the descending track (1-2), and the exit end of the descending track (1-2) is connected with the lower track (1-4) The entrance end is connected, and the exit end of the low track (1-4) is connected with the entrance end of the uprail track (1-1); In the energy storage stage: the excess electric energy output by the external renewable energy power generation unit (8) is converted by the No. 1 frequency converter (2) to supply power to the motor (6). The motor (6) drives the standard by driving the upward transmission mechanism (4). The trolley (7) moves from bottom to top, causing the standard trolley (7) to move from the low track (1-4) to the spiral track (1-3), and then be blocked by the blocking mechanism; In the power generation stage: the standard trolley (7) moves from top to bottom along the downward track (1-2). The movement of the standard trolley (7) drives the movement of the descending transmission mechanism (3), and is driven by the movement of the descending transmission mechanism (3). The generator (5) rotates to realize the generator (5) generating electricity. 2. The large-scale gravity energy storage system according to claim 1, characterized in that the low-level orbit (1-4) is a semi-circular orbit. 3. The large-scale gravity energy storage system according to claim 1, characterized in that both the upward track (1-1) and the downward track (1-2) are linear tracks. 4. The large-scale gravity energy storage system according to claim 1, characterized in that the ascending transmission mechanism (4) includes a No. 1 closing cable (4-1), a No. 1 winch (4-2) and a No. 1 pulley ( 4-3); No. 1 closing cable (4-1) is set on No. 1 winch (4-2) and No. 1 pulley (4-3), and is connected with No. 1 winch (4-2) and No. 1 pulley (4-3) Close contact and sliding connection relative to the two; The rotating shaft of the electric motor (6) is fixedly connected to the drive shaft of the No. 1 winch (4-2); The standard trolley (7) is connected to the No. 1 closing cable (4-1) and follows the movement of the No. 1 closing cable (4-1). 5. The large-scale gravity energy storage system according to claim 1, characterized in that the descending transmission mechanism (3) includes 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 set on the No. 2 winch (3-2) and the No. 2 pulley (3-3), and is connected with the No. 2 winch (3-2) and the No. 2 pulley (3-3) Close contact and sliding connection relative to the two; The rotating shaft of the generator (5) is fixedly connected to the drive shaft of the No. 2 winch (3-2); The standard trolley (7) is connected to the No. 2 closing cable (3-1) and follows the movement of the No. 2 closing cable (3-1). 6. The large-scale gravity energy storage system according to claim 1, characterized in that it also includes a No. 2 frequency converter (9). The output electric energy of the generator (5) is converted by the No. 2 frequency converter (9) and then sent to Grid. 7. The large-scale gravity energy storage system according to claim 1, characterized in that 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 electric motor (6) and the generator (5).