Wind power mixed tower device

Abstract

The invention relates to the technical field of integration of wind power generation and energy storage, in particular to a wind power mixed tower device. Comprising a tower body and a gravity energy storage mechanism, and the gravity energy storage mechanism is arranged in the tower body; the tower body comprises an outer cylinder and an inner cylinder, the outer cylinder is arranged at the top of the foundation, the inner cylinder is coaxially arranged at the top end in the outer cylinder, and a working space used for installing the gravity energy storage mechanism is formed between the outer cylinder and the inner cylinder; the gravity energy storage mechanism comprises a driving assembly, a transmission assembly and an energy storage assembly, the driving assembly can drive the energy storage assembly to ascend in the height direction of the working space through the transmission assembly, and the energy storage assembly can descend in the height direction of the working space so as to release stored energy to the driving assembly. According to the wind power mixed tower device, the gravity energy storage mechanism and the tower body are fused to form a shared structure, and the cost is saved.

Description

Technical Field

[0001] This invention relates to the field of integrated wind power generation and energy storage technology, and in particular to a wind power hybrid tower device. Background Technology

[0002] Gravity energy storage, as a common physical energy storage method, has advantages such as long cycle life, no chemical pollution, and no capacity decay. Current gravity energy storage solutions are typically vertical shafts on the ground or on mountain slopes, requiring dedicated land acquisition and excavation. Wind turbine towers serve only as load-bearing structures with relatively simple functions. The gravity energy storage system and the wind turbine tower are independent of each other, failing to share a structure, resulting in high costs. Summary of the Invention

[0003] The purpose of this invention is to provide a wind power hybrid tower device to alleviate the problem that in the prior art, the gravity energy storage system and the wind turbine tower are independent of each other, do not form a shared structure, and have high costs.

[0004] To solve the above-mentioned technical problems, the technical solution provided by the present invention is as follows: A wind power hybrid tower device includes: a tower body and a gravity energy storage mechanism, wherein the gravity energy storage mechanism is disposed inside the tower body; The tower body includes an outer cylinder and an inner cylinder. The outer cylinder is disposed on the top of the foundation, and the inner cylinder is coaxially disposed at the top of the outer cylinder. There is a working space between the outer cylinder and the inner cylinder for installing the gravity energy storage mechanism. The gravity energy storage mechanism includes a drive component, a transmission component, and an energy storage component. The drive component can drive the energy storage component to rise along the height direction of the workspace via the transmission component, and the energy storage component can descend along the height direction of the workspace to release the stored energy to the drive component.

[0005] Furthermore, multiple ribs are arranged circumferentially between the outer cylinder and the inner cylinder. The bottom of the ribs is cast into the outer cylinder, and the top of the ribs is connected to the flange of the inner cylinder through a connector.

[0006] Furthermore, the drive assembly includes a lifting and power generation unit, which is fixedly installed in the installation space sandwiched between two adjacent rib beams.

[0007] Furthermore, the integrated power generation unit is connected in parallel with the DC bus of the wind turbine converter via a converter.

[0008] Furthermore, the transmission assembly includes a lifting cable, one end of which is connected to the rotor of the integrated lifting and power generation unit, and the other end of which is connected to the energy storage assembly.

[0009] Furthermore, the energy storage component includes a counterweight connected to the lower end of the lifting cable, and a guide structure for guiding the counterweight is provided along the height direction within the workspace.

[0010] Furthermore, the counterweight is an assemblable reinforced concrete block or steel plate box, and the mass of the counterweight is adjustable.

[0011] Furthermore, an elastic component is provided between the upper surface of the counterweight and the bottom of the rib beam.

[0012] Furthermore, an anti-collision block is provided between the counterweight and the inner wall of the outer cylinder.

[0013] Furthermore, a laser displacement sensor is provided at the top of the outer cylinder for real-time monitoring of the position of the counterweight.

[0014] This invention can bring at least the following beneficial effects: The wind power hybrid tower device provided by the present invention includes: a tower body and a gravity energy storage mechanism, wherein the gravity energy storage mechanism is disposed inside the tower body; the tower body includes an outer cylinder and an inner cylinder, the outer cylinder is disposed at the top of the foundation, and the inner cylinder is coaxially disposed at the top end inside the outer cylinder, and a working space for installing the gravity energy storage mechanism is provided between the outer cylinder and the inner cylinder; the gravity energy storage mechanism includes a drive component, a transmission component, and an energy storage component, wherein the drive component can drive the energy storage component to rise along the height direction of the working space through the transmission component, and the energy storage component can descend along the height direction of the working space to release the stored energy to the drive component.

[0015] The gravity energy storage mechanism is installed in the working space between the outer and inner cylinders, integrating the tower and energy storage unit without requiring additional land occupation, thus saving land acquisition costs. The outer and inner cylinders form a spatial force-bearing system, simultaneously bearing the load of the wind turbine and the reverse load of the energy storage components. The gravity energy storage mechanism and the tower body are integrated, forming a shared structure and saving costs. During the energy storage phase, when the wind turbine output exceeds the grid connection command, the excess electrical energy causes the drive component to operate in motor mode. The drive component, through the transmission component, drives the energy storage component to rise along the height of the working space, converting electrical energy into gravitational potential energy. During the energy release phase, when the wind turbine output is insufficient or grid frequency regulation is required, the energy storage component descends along the height of the working space, and the drive component operates in generator mode, injecting power into the DC bus.

[0016] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of the present invention, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is an overall schematic diagram of the wind power hybrid tower device provided in an embodiment of the present invention; Figure 2 This is a partial structural schematic diagram of the wind power hybrid tower device provided in an embodiment of the present invention.

[0019] icon: 100-Tower body; 110-Outer cylinder; 120-Inner cylinder; 130-Rib beam; 140-Support beam; 200-Foundation; 300-Gravity energy storage mechanism; 310-Integrated lifting and power generation unit; 320-Lifting cable; 330-Counterweight block; 340-Elastic component; 350-Anti-collision block. Detailed Implementation

[0020] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0022] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Physical quantities in formulas, unless otherwise specified, should be understood as basic quantities in the International System of Units (SI), or derived quantities derived from basic quantities through mathematical operations such as multiplication, division, differentiation, or integration.

[0023] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0025] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0026] Example 1 Current gravity energy storage solutions are typically implemented using vertical shafts on the ground or on mountain slopes, requiring dedicated land acquisition and excavation. Wind turbine towers serve only as load-bearing structures with relatively limited functionality. Gravity energy storage systems operate independently of wind turbine towers, failing to share a structure, resulting in high costs.

[0027] In view of this, the present invention provides a wind power hybrid tower device, including: a tower body 100 and a gravity energy storage mechanism 300, the gravity energy storage mechanism 300 being disposed inside the tower body 100; the tower body 100 includes an outer cylinder 110 and an inner cylinder 120, the outer cylinder 110 being disposed on the top of the foundation 200, the inner cylinder 120 being coaxially disposed at the top end inside the outer cylinder 110, and a working space for installing the gravity energy storage mechanism 300 being provided between the outer cylinder 110 and the inner cylinder 120; the gravity energy storage mechanism 300 includes a drive component, a transmission component, and an energy storage component, the drive component being able to drive the energy storage component to rise along the height direction of the working space through the transmission component, and the energy storage component being able to descend along the height direction of the working space to release the stored energy to the drive component.

[0028] The gravity energy storage mechanism 300 is installed in the working space between the outer cylinder 110 and the inner cylinder 120. The tower and energy storage are integrated, requiring no additional land and saving land acquisition costs. The outer cylinder 110 and the inner cylinder 120 form a spatial force-bearing system, simultaneously bearing the load of the wind turbine and the reverse load of the energy storage components. The gravity energy storage mechanism 300 and the tower body 100 are integrated, forming a shared structure and saving costs. During the energy storage phase, when the wind turbine output exceeds the grid connection command, the excess electrical energy causes the drive component to operate in motor mode. The drive component, through the transmission component, drives the energy storage component to rise along the height of the working space, converting electrical energy into gravitational potential energy. During the energy release phase, when the wind turbine output is insufficient or the grid frequency regulation requires it, the energy storage component descends along the height of the working space, and the drive component operates in generator mode, injecting power into the DC bus.

[0029] See Figure 1 The lower part of the wind turbine hybrid tower device is a circular extended foundation 200. A reinforced concrete outer cylinder 110 is coaxially installed on the top of the foundation 200. The inner diameter of the outer cylinder 110 is greater than or equal to 10m, and the height of the outer cylinder 110 is greater than 20m. A steel inner cylinder 120 is coaxially installed on the upper part of the outer cylinder 110. The outer diameter of the inner cylinder 120 is 4-8m, which is used to support the wind turbine generator.

[0030] In an optional embodiment, multiple ribs 130 are arranged circumferentially between the outer cylinder 110 and the inner cylinder 120. The bottom of the ribs 130 is cast into the outer cylinder 110, and the top of the ribs 130 is connected to the flange of the inner cylinder 120 through a connector.

[0031] See Figure 2 N rib beams 130 (N≥3) are evenly arranged circumferentially between the outer cylinder 110 and the inner cylinder 120. The roots of the rib beams 130 are integrally cast in place with the outer cylinder 110, and the tops of the rib beams 130 are connected to the flanges of the inner cylinder 120 through prestressed anchor bolts, forming a spatial truss system of outer cylinder 110-rib beams 130-inner cylinder 120. This spatial force-bearing system simultaneously bears the wind turbine load and the reverse load of the counterweight block 330.

[0032] In an optional embodiment, the drive component includes a lifting and power generation unit 310, which is fixedly installed in the installation space between two adjacent rib beams 130.

[0033] See Figure 2 Within the fan-shaped installation space formed by every two adjacent ribs 130, multiple integrated lift-generator units 310 are fixed, and the lift-generator units 310 are fixed on the support beams 140 between the ribs 130. The lift-generator units 310 are connected in parallel with the DC bus of the wind turbine converter through a converter, realizing bidirectional energy flow. The lift-generator units 310 and the wind turbine converter share the DC bus, resulting in high hardware reuse and eliminating the need for an additional grid-connected inverter.

[0034] In an optional embodiment, the transmission assembly includes a lifting cable 320, one end of which is connected to the rotor of the integrated lifting generator 310, and the other end is connected to the energy storage assembly.

[0035] The stator of the integrated generator 310 is directly embedded in the rib beam 130. The rotor drives the lifting cable 320 via a planetary roller screw or a winch drum. The lower end of the lifting cable 320 is connected to the counterweight block 330. A guide structure for guiding the counterweight block 330 is provided along the height direction within the working space. Specifically, the guide structure can be a track or guide shoe laid on the inner wall of the outer cylinder 110, so that the counterweight block 330 can only move vertically and prevents swaying. When the lifting cable 320 drives the counterweight block 330 to rise and fall, the two symmetrically arranged sets of counterweight blocks 330 need to be operated synchronously to ensure structural force balance.

[0036] In an optional embodiment, the counterweight 330 is an assemblable reinforced concrete block or steel plate box, and the mass of the counterweight 330 is adjustable.

[0037] Specifically, the total mass of the counterweight 330 can be adjusted within the range of 500-20000t to meet energy storage requirements under different conditions. By utilizing the reverse bending moment of the counterweight 330 on the foundation 200, the diameter of the foundation 200 base plate can be reduced by 10%-25% compared to conventional solutions, and the amount of concrete can be reduced by 15%-30%.

[0038] In an optional embodiment, an elastic component 340 is provided between the upper surface of the counterweight 330 and the bottom of the rib beam 130.

[0039] See Figure 1 The elastic component 340 can use a large-diameter helical spring, which can increase energy storage. During the energy storage phase, the counterweight 330 moves upward and compresses the helical spring, converting some electrical energy into elastic potential energy. During the energy release phase, the counterweight 330 moves downward under the combined action of its own weight and the elastic force of the helical spring, and the elastic potential energy is converted into electrical energy again.

[0040] In an optional embodiment, an anti-collision block 350 is provided between the counterweight 330 and the inner wall of the outer cylinder 110.

[0041] See Figure 1 Multiple anti-collision blocks 350 are provided along the height direction to prevent the counterweight block 330 from directly contacting the inner wall of the outer cylinder 110 during the up and down movement and causing damage.

[0042] In an optional embodiment, the top of the outer cylinder 110 is provided with a laser displacement sensor for real-time monitoring of the position of the counterweight 330, which is used for control system calculations.

[0043] In this embodiment, the gravity energy storage cycle efficiency is greater than or equal to 86%, with a design life of 30 years, no capacity decay, and a cost per kilowatt-hour of less than 0.05 yuan / kWh. A counterweight 330 with a stroke of 20-35m can provide 1-5MWh of energy storage, sufficient for a single unit to generate full power for 1-3 hours. The mass and stroke of the counterweight 330 can be adjusted online, thereby achieving active control of the tower's center of gravity and reducing the foundation's 200mm bending moment under extreme loads.

[0044] The following explains the working principle of the wind power hybrid tower device: During the energy storage phase, when the wind turbine output exceeds the grid connection command, the excess electrical energy causes the integrated generator 310 to enter motor mode, the lifting cable 320 is wound up, and the counterweight 330 moves upward, converting electrical energy into gravitational potential energy. At the same time, the spring is compressed, converting electrical energy into elastic potential energy.

[0045] During the energy release phase, when the wind turbine output is insufficient or the grid frequency regulation is required, the counterweight 330 moves downward under its own weight and the elastic force of the spring, lifting the generator 310 into generator mode and injecting power into the DC bus.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wind power hybrid tower device, characterized in that, include: The tower body and the gravity energy storage mechanism are disposed inside the tower body; The tower body includes an outer cylinder and an inner cylinder. The outer cylinder is disposed on the top of the foundation, and the inner cylinder is coaxially disposed at the top of the outer cylinder. There is a working space between the outer cylinder and the inner cylinder for installing the gravity energy storage mechanism. The gravity energy storage mechanism includes a drive component, a transmission component, and an energy storage component. The drive component can drive the energy storage component to rise along the height direction of the workspace via the transmission component, and the energy storage component can descend along the height direction of the workspace to release the stored energy to the drive component.

2. The wind power hybrid tower device according to claim 1, characterized in that, Multiple ribs are arranged circumferentially between the outer cylinder and the inner cylinder. The bottom of the ribs is cast into the outer cylinder, and the top of the ribs is connected to the flange of the inner cylinder through a connector.

3. The wind power hybrid tower device according to claim 2, characterized in that, The drive assembly includes a lifting and power generation unit, which is fixedly installed in the installation space sandwiched between two adjacent rib beams.

4. The wind power hybrid tower device according to claim 3, characterized in that, The integrated booster generator is connected in parallel with the DC bus of the wind turbine converter via a converter.

5. The wind power hybrid tower device according to claim 3, characterized in that, The transmission assembly includes a lifting cable, one end of which is connected to the rotor of the integrated lifting and power generation unit, and the other end of which is connected to the energy storage assembly.

6. The wind power hybrid tower device according to claim 5, characterized in that, The energy storage component includes a counterweight block connected to the lower end of the lifting cable, and a guide structure for guiding the counterweight block is provided along the height direction within the workspace.

7. The wind power hybrid tower device according to claim 6, characterized in that, The counterweight is an assembled reinforced concrete block or a steel plate box, and the mass of the counterweight is adjustable.

8. The wind power hybrid tower device according to claim 6, characterized in that, An elastic component is provided between the upper surface of the counterweight and the bottom of the rib beam.

9. The wind power hybrid tower device according to claim 6, characterized in that, An anti-collision block is provided between the counterweight and the inner wall of the outer cylinder.

10. The wind power hybrid tower device according to claim 6, characterized in that, A laser displacement sensor is installed at the top of the outer cylinder for real-time monitoring of the position of the counterweight.

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