Novel fan tower drum configured with high-density mechanical energy storage and mounting method

Abstract

The invention discloses a novel fan tower drum configured with high-density mechanical energy storage and an installation method, the novel fan tower drum mainly comprises a tower drum and a flywheel energy storage system, and a supporting seat is arranged in the tower drum and used for supporting the flywheel energy storage system. The flywheel energy storage system is fixed to the supporting base along the central axis of the tower drum, is cylindrical, has the diameter smaller than the inner diameter of the tower drum and has a large height so as to improve the energy storage density and efficiency. A people-loading platform and a tower drum door are arranged above the flywheel energy storage system, and a crawling ladder is arranged on the side face in the tower drum. The internal space of the fan tower drum can be fully utilized, through arrangement of the flywheel energy storage system, on one hand, the overall gravity center of the wind generating set can be reduced, and on the other hand, horizontal swing of the wind generating set is reduced through the gyroscopic effect generated during flywheel rotation.

Description

Technical Field

[0001] The invention relates to a novel wind turbine tower configured with high-density mechanical energy storage and an installation method, belonging to the field of wind turbine tower structure design. Background Art

[0002] The wind turbine tower is the load-bearing structure of the wind turbine. Its structural stability will play a direct role in the operation of the entire wind turbine. Especially with the development of large-scale wind turbines, higher requirements have been put forward for its manufacturing, transportation, installation and subsequent maintenance. In addition, due to the unstable wind speed, wind power generation has strong volatility and intermittency, which has led to more serious problems in the frequency stability of the power system and an increasing demand for peak load regulation of the power grid. Traditional peak load regulation mainly relies on thermal power generation, such as installing diesel generators, but due to the special requirements of the diesel engine itself, it can only be stopped within 30 minutes after starting. And the wind power is often interrupted for seconds to minutes. Not only does the frequent start-up of the diesel unit affect its service life; but after the wind turbine is restarted, the diesel engine will work at the same time, which will cause excess electricity.

[0003] In summary, the present invention proposes a brand-new wind turbine tower structure to effectively solve various problems faced by the development of large-scale wind turbines.

[0004] Another technical solution for grid peak regulation is to use a flywheel energy storage device. This system can realize the mutual conversion of kinetic energy and electrical energy. That is, when charging, the motor drives the flywheel to rotate at high speed, so the electrical energy is converted into kinetic energy and stored; when discharging, the high-speed rotating flywheel drives the generator to run and convert kinetic energy into electrical energy. Compared with other grid peak regulation solutions, such as supercapacitors, superconducting magnetic energy storage, and pumped storage, the flywheel energy storage response time is milliseconds, with the characteristics of long continuous energy release time and fast response time, which can effectively smooth the output power of wind farms and thus adjust the grid frequency. Therefore, international research institutions have introduced flywheel energy storage technology into renewable energy power generation to assist in grid peak regulation.

[0005] In summary, the problem of wind turbine grid peak regulation is quite prominent, and it is urgent to propose a technical solution for wind turbine generator sets equipped with high-density mechanical energy storage, that is, to use a flywheel energy storage device inside the tower to achieve the purpose of energy storage and grid peak regulation. Summary of the invention

[0006] The purpose of the present invention is to provide a new type of wind turbine tower configured with high-density mechanical energy storage and an installation method to solve the problems of fluctuation of output power of wind turbine generator set and stability of wind turbine itself in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A new type of wind turbine tower with high-density mechanical energy storage includes a tower and a flywheel energy storage system. A support seat is provided inside the tower to support the flywheel energy storage system. The flywheel energy storage system is fixed on the support seat along the central axis of the tower. It is cylindrical in shape, with a diameter smaller than the inner diameter of the tower and a large height to improve energy storage density and efficiency. An access platform and a tower door are provided above the flywheel energy storage system, and a ladder is provided on the side of the tower.

[0009] In the above technical solution, further, an expanded bottom is provided inwardly at the bottom of the tower, and a bottom bolt hole is provided on the expanded bottom of the tower for connecting to the wind turbine foundation.

[0010] Furthermore, a space at least 3m high is provided above the tower expansion base to install equipment such as electrical platforms, auxiliary transformers, and frequency converter cabinets. That is, the height difference between the tower expansion base and the support base is not less than 3m. The support base is annular and has a number of support base bolt holes for installing the flywheel energy storage system. Below the support base, a number of wedge-shaped supports are provided close to the inner wall of the tower to improve the stability of the support base. The top of the tower is provided with a number of top bolt holes for connecting the upper tower.

[0011] Furthermore, the flywheel energy storage system includes a flywheel energy storage body and a flywheel base arranged at the bottom of the flywheel energy storage body. The diameter of the flywheel base is larger than the bottom diameter of the flywheel energy storage body, and a plurality of flywheel base bolt holes are arranged on the flywheel base. The size and position of the flywheel base bolt holes are consistent with the support base bolt holes. The flywheel energy storage system is fixed to the support base by bolts. The flywheel energy storage system is consistent with the central axis of the tower. On the one hand, the system can reduce the overall center of gravity of the wind turbine generator set, and on the other hand, the gyroscopic effect generated when the flywheel rotates can reduce the horizontal swing of the wind turbine generator set, thereby enhancing the stability of the wind turbine generator set.

[0012] Furthermore, a tower connecting ring is provided above the flywheel energy storage body, the diameter of the tower connecting ring (304) is larger than the diameter of the flywheel energy storage body, and a connecting piece is provided on the outer edge of the tower connecting ring, which is connected to the inner wall of the tower by welding or bolting.

[0013] Furthermore, the access platform is arranged in the tower and is located at least 1.8m above the flywheel energy storage system, and a tower door is provided on the tower shell at the same height as the access platform.

[0014] Furthermore, a ladder is provided on the inner wall of the tower, and the ladder extends upward from the bottom of the tower to the access platform. In order to arrange the ladder, the access platform, the tower connecting ring and the support seat are respectively provided with a first ladder hole, a second ladder hole and a third ladder hole.

[0015] Furthermore, using the above-mentioned method for installing a novel wind turbine tower configured with high-density mechanical energy storage, the specific installation steps include:

[0016] Step 1: Tower hoisting

[0017] The tower is hoisted after arriving at the site and connected to the wind turbine foundation. The tower transported to the site for hoisting should be installed with ladders, support bases and wedge bases before leaving the factory.

[0018] Step 2: Installation of flywheel energy storage system

[0019] The flywheel energy storage system is hoisted onto the support seat inside the tower, and after alignment, the flywheel base and the support seat are fixed by bolts, and then the connecting parts on the tower connecting ring and the embedded parts on the inner wall of the tower are connected by welding or bolts.

[0020] Step 3: Install the platform

[0021] Hoist the access platform and fix it about 1.8m above the flywheel energy storage system.

[0022] Step 4: Hoisting the upper tower

[0023] After the tower is installed, it will serve as the first-layer tower, on which other wind turbine towers will be hoisted. The upper-layer tower is consistent with the common wind turbine towers on the market, and does not contain flywheel energy storage systems, access platforms and other accessories.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] (1) The wind turbine tower of the present invention is used as the bottom tower of the entire wind turbine, and a flywheel energy storage system is arranged at its bottom. Through the mutual conversion of electric energy and flywheel kinetic energy, the grid frequency is adjusted to achieve full peak regulation. Compared with peak regulation methods such as thermal power generation, supercapacitors, superconducting magnetic energy storage and pumped water storage, the flywheel energy storage response time is milliseconds, and has the advantages of long continuous energy release time and fast load response.

[0026] (2) The present invention makes full use of the cylindrical space at the bottom of the first section of the tower, arranges a flywheel energy storage system with a large height and high energy storage density, and makes full use of the internal space of the wind turbine tower. In addition, while the power grid is peak-shaving, the rigidity and integrity of the tower can be increased, and the overall center of gravity of the upper structure of the wind turbine set can be reduced, which is greatly helpful to increase the stability of the upper structure of the wind turbine.

[0027] (3) The axis of the flywheel energy storage system in the novel wind turbine tower of the present invention is consistent with the axis of the tower, and the flywheel rotates at high speed around the vertical axis, thereby generating a gyroscopic effect and forming a stabilizing torque. The stabilizing torque can be used to resist the horizontal wind load, reduce the horizontal sway of the wind turbine, and improve the stability of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A perspective view of a novel wind turbine tower in an embodiment of the present invention;

[0029] Figure 2 This is an overall schematic diagram of a novel wind turbine tower in an embodiment of the present invention;

[0030] Figure 3 A top view of a novel wind turbine tower in an embodiment of the present invention;

[0031] Figure 4 A bottom view of a novel wind turbine tower in an embodiment of the present invention;

[0032] Figure 5 This is a front view of the AA section of a novel wind turbine tower in an embodiment of the present invention;

[0033] Figure 6 It is a three-dimensional schematic diagram of the AA section of a novel wind turbine tower in an embodiment of the present invention;

[0034] Figure 7 This is a schematic diagram of the AA cross-section of the bottom structure of a novel wind turbine tower in an embodiment of the present invention;

[0035] Figure 8 A three-dimensional diagram of a flywheel energy storage system according to an embodiment of the present invention;

[0036] In the figure: 1. tower; 101. tower shell; 102. platform for people to climb; 1021. first ladder hole; 103. support seat; 1031. support seat bolt hole; 1032. third ladder hole; 104. wedge-shaped support; 105. expanded bottom; 1051. bottom bolt hole; 106. top bolt hole; 2. tower door; 3. flywheel energy storage system; 301. flywheel energy storage body; 302. vacuum pump; 303. flywheel base; 3031. flywheel base bolt hole; 3032. bolt; 304. tower connecting ring; 3041. connecting piece; 3042. second ladder hole; 4. ladder; DETAILED DESCRIPTION

[0037] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0038] See also Figure 1-8 , which is a specific embodiment of a new type of wind turbine tower and installation method configured with high-density mechanical energy storage provided by the present invention. The new type of wind turbine tower includes a tower 1 and a flywheel energy storage system 3. A support seat 103 is provided inside the tower 1 to support the flywheel energy storage system 3. The flywheel energy storage system 3 is fixed on the support seat 103 along the central axis of the tower 1. It is cylindrical in shape, with a diameter smaller than the inner diameter of the tower 1 and a large height to improve the energy storage efficiency. A platform 102 and a tower door 2 are provided above the system 3, and a ladder 4 is provided on the side of the tower 1.

[0039] A tower expansion bottom 105 is provided at the bottom of the tower 1, and two rows of bottom bolt holes 1051 are provided on the tower expansion bottom 105 for connecting to the wind turbine foundation.

[0040] A space of about 3m high is provided above the tower expansion base 105 to install equipment such as electrical platforms, auxiliary transformers, and frequency converter cabinets. A circular support seat 103 is provided about 3m above the tower expansion base 105, and a support seat bolt hole 1031 is provided on the edge of the support seat 103; a plurality of wedge-shaped supports 104 are provided below the support seat 103, close to the inner wall of the tower 1, to improve the stability of the support seat 103; a plurality of top bolt holes 106 are provided on the top of the tower 1 for connecting to the upper tower.

[0041] A flywheel base 303 is provided below the flywheel energy storage body 301. The diameter of the flywheel base is larger than the bottom diameter of the flywheel energy storage body. A flywheel base bolt hole 3031 is provided at the edge of the flywheel base. The size and position of the flywheel base bolt hole 3031 are consistent with the support base bolt hole 1031. The flywheel energy storage system 3 is fixed to the support base 103 by bolts 3032. The flywheel energy storage system 3 is consistent with the central axis of the tower 1. On the one hand, the system 3 can reduce the overall center of gravity of the wind turbine generator set, and on the other hand, the horizontal swing of the wind turbine generator set can be reduced by the gyroscopic effect generated when the flywheel rotates.

[0042] The flywheel energy storage system 3 includes a flywheel energy storage body 301. The flywheel energy storage body 301 is a sealed structure, and a vacuum pump 302 is provided above the flywheel energy storage body 301 to maintain the vacuum inside the flywheel energy storage body 301, thereby reducing the resistance when the flywheel rotates and increasing the energy storage efficiency.

[0043] A tower connecting ring 304 is provided above the flywheel energy storage body 301. The diameter of the tower connecting ring 304 is larger than the diameter of the flywheel energy storage body. A connecting piece 3041 is provided on the outer edge of the tower connecting ring 304 and is connected to the inner wall of the tower 1 by welding or bolting.

[0044] A manned platform 102 is provided about 1.8 m above the flywheel energy storage system 3 , and a tower door 2 is provided on the tower shell 101 at the same height as the manned platform 102 .

[0045] The inner wall of the tower 1 is provided with a ladder 4, which extends upward from the tower expansion bottom 105 to the access platform 102. In order to arrange the ladder 4, the access platform 102, the tower connecting ring 304 and the support seat 103 are respectively provided with a first ladder hole 1021, a second ladder hole 3042 and a third ladder hole 1032.

[0046] Using the above-mentioned new type of wind turbine tower configured with high-density mechanical energy storage and installation method, the specific installation steps include:

[0047] Step 1: Tower hoisting

[0048] The tower 1 is hoisted after arriving at the site and connected to the wind turbine foundation. The tower 1 transported to the site for hoisting should be installed with a ladder 3042, a support base 103 and a wedge-shaped base 104 before leaving the factory.

[0049] Step 2: Installation of flywheel energy storage system

[0050] The flywheel energy storage system 3 is hoisted onto the support seat 103 in the tower 1, and after alignment, the flywheel base 303 and the support seat 103 are fixed by bolts 3032, and then the connecting piece 3041 on the tower connecting ring 304 is connected with the embedded part on the inner wall of the tower 1 by welding or bolts.

[0051] Step 3: Install the platform

[0052] The access platform 102 is hoisted and fixed about 1.8 m above the flywheel energy storage system 3 .

[0053] Step 4: Hoisting the upper tower

[0054] After the first tower 1 is installed, the upper tower is hoisted. The upper tower is consistent with the common wind turbine tower in the market, and does not contain the flywheel energy storage system 3, the access platform 102 and other accessories.

[0055] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the ideas and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A new type of wind turbine tower with high-density mechanical energy storage, characterized in that: The invention comprises a tower (1) and a flywheel energy storage system (3), wherein a support seat (103) is provided inside the tower (1), and the flywheel energy storage system (3) is fixed on the support seat (103) along the central axis of the tower (1), and is cylindrical in shape, with a diameter smaller than the inner diameter of the tower (1), and an access platform (102) and a tower door (2) are provided above the flywheel energy storage system (3), and a ladder (4) is provided on the side of the interior of the tower (1).

2. A novel wind turbine tower with high-density mechanical energy storage according to claim 1, characterized in that: The bottom of the tower (1) is provided with an expanded bottom (105) inwardly, and the expanded bottom is provided with bottom bolt holes (1051) for connecting to a wind turbine foundation, and the height difference between the expanded bottom (105) and the support seat (103) is not less than 3m for installing equipment on the expanded bottom; the support seat (103) is annular, and the support seat (103) is provided with a plurality of support seat bolt holes (1031); below the support seat (103), a plurality of wedge-shaped supports (104) are provided close to the inner wall of the tower (1) for improving the stability of the support seat (103); the top of the tower (1) is provided with a plurality of top bolt holes (106) for connecting to an upper tower.

3. A novel wind turbine tower with high-density mechanical energy storage according to claim 1, characterized in that: The flywheel energy storage system (3) comprises a flywheel energy storage body (302) and a flywheel base (303) arranged at the bottom of the flywheel energy storage body (301); the diameter of the flywheel base is larger than the bottom diameter of the flywheel energy storage body, and the flywheel base is provided with a plurality of flywheel base bolt holes (3031) for connecting and fixing with a support seat (103) by bolts (3032), and keeping the central axis of the flywheel energy storage system (3) and the tower (1) consistent.

4. A novel wind turbine tower with high-density mechanical energy storage according to claim 3, characterized in that: The flywheel energy storage body (301) is provided with a tower connection ring (304), the diameter of the tower connection ring (304) is larger than the diameter of the flywheel energy storage body, and a connecting piece (3041) is provided on the outer edge of the tower connection ring (304) for connecting to the inner wall of the tower (1) by welding or bolt connection.

5. A novel wind turbine tower with high-density mechanical energy storage according to claim 4, characterized in that: The ladder (4) extends upward from the bottom of the tower to the access platform (102). In order to arrange the ladder (4), a first ladder hole (1021), a second ladder hole (3042) and a third ladder hole (1032) are respectively provided on the access platform (102), the tower connecting ring (304) and the support seat (103).

6. A novel wind turbine tower with high-density mechanical energy storage according to claim 1, characterized in that: The access platform (102) is arranged in the tower and is located at least 1.8 m above the flywheel energy storage system (3), and a tower door (2) is provided on the tower shell (101) at the same height as the access platform (102).

7. A method for installing a novel wind turbine tower with high-density mechanical energy storage as claimed in any one of claims 1 to 6, characterized in that: The installation of the internal components of the tower (1) can be completed in the factory or through on-site hoisting construction; The hoisting construction steps include: Step 1: Tower hoisting The tower (1) is hoisted after arriving at the site and connected to the wind turbine foundation. The tower (1) transported to the site for hoisting should be installed with a ladder (3042), a support base (103) and a wedge-shaped base (104) before leaving the factory; Step 2: Installation of flywheel energy storage system The flywheel energy storage system (3) is hoisted onto the support seat (103) in the tower (1), and after alignment, the flywheel base (303) and the support seat (103) are fixed by bolts (3032), and then the connecting piece (3041) on the tower connecting ring (304) and the embedded piece on the inner wall of the tower (1) are connected by welding or bolts; Step 3: Install the platform Hoisting a manned platform (102), and fixing the manned platform (102) at least 1.8 m above the flywheel energy storage system (3); Step 4: Hoisting the upper tower After the above tower is installed, it serves as the first-layer tower, on which other wind turbine towers on the upper layers are hoisted.

Images