Flywheel energy storage three-stand-column type fan foundation with self-stability and power grid peak regulation

Abstract

The flywheel energy storage three-stand-column type draught fan foundation comprises a wind turbine generator set, a three-stand-column mechanism, a flywheel energy storage device and a mooring device, the lower end of the three-stand-column mechanism for providing buoyancy is expanded to form a large space, and the large flywheel energy storage device is arranged in the large space. The flywheel energy storage device not only can reduce the overall gravity center of the fan system and improve the stability and the anti-overturning capacity of the floating fan, but also can realize the whole-course peak regulation of the generated power of the floating fan through the mutual conversion of electric energy and flywheel kinetic energy. Meanwhile, the flywheel rotating at a high speed has a gyroscopic effect, stable torque generated by rotation of the flywheel can be used for resisting horizontal loads such as wind, waves and flow, the expanded lower buoy has the function of a heaving plate, and swing of the floating fan is reduced. And therefore, the influence of the wake effect on the power generation efficiency of the floating fan is reduced, and the influence of swinging on the structural stability of the fan is avoided.

Description

Technical Field

[0001] The invention relates to a flywheel energy storage three-column wind turbine foundation with self-stability and power grid peak regulation, and belongs to the field of offshore floating wind turbine structure design. Background Art

[0002] Due to the unstable wind speed, wind power generation has strong volatility and intermittency, which leads to more serious frequency stability problems in the power system and 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. The wind power is often interrupted for a few seconds to a few minutes, which not only affects the service life of the diesel unit due to frequent startup, but also causes the diesel engine to work at the same time after the wind turbine is restarted, which will cause excess electricity.

[0003] In addition, offshore floating wind turbines are susceptible to periodic swings due to the influence of wind, waves and currents. On the one hand, periodic swings will cause the blades to enter the wake area where the wind speed decreases, thereby reducing the power generation efficiency; on the other hand, swings may also cause structural failure or even capsize. Wind turbine sway reduction has become one of the key issues for offshore floating wind turbines. Feasible traditional sway reduction methods include sway stabilization fins, sway stabilization tanks and gyro sway reduction. Although the former two are low-cost, the sway reduction effect is poor; although gyro sway reduction technology is mature and has good sway reduction effect, it is expensive and difficult to promote.

[0004] To sum up, the problems of wind turbine grid peak regulation and floating wind turbine sway reduction are still prominent, and it is urgent to propose a new wind turbine technical solution. The present invention provides an offshore wind turbine foundation that can be self-stabilized and grid peak regulated, achieves the floating wind turbine sway reduction effect, and realizes full grid peak regulation control. Summary of the invention

[0005] The purpose of the present invention is to provide a three-column wind turbine foundation with flywheel energy storage that has self-stability and grid peak regulation, so as to solve the problem of fluctuation of offshore wind turbine output power and the problem of wind turbine swing itself in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A three-column wind turbine foundation with flywheel energy storage and self-stability and power grid peak regulation includes a wind turbine set, a three-column mechanism, a flywheel energy storage device and a mooring device. The three-column mechanism includes three columns arranged in an equilateral triangle, and the wind turbine set is arranged above the center of gravity of the equilateral triangle. The columns are connected to each other and to the wind turbine set through trusses. A flywheel energy storage device is arranged inside each column.

[0008] In the above technical solution, further, the mooring device comprises three groups, corresponding to three columns respectively, and each group comprises a mooring anchor chain and an anchor, wherein the upper end of the mooring anchor chain is fixed to the lower surface of the column, and the lower end is fixed to the anchor.

[0009] Furthermore, each column of the three-column mechanism is composed of an upper column and a lower column. The upper column and the lower column are coaxial and together form a hollow cylindrical structure that is closed on the outside and connected on the inside, providing buoyancy for the wind turbine.

[0010] Furthermore, the diameter of the lower column is greater than that of the upper column. The large-diameter lower column provides space for arranging a large-diameter flywheel energy storage device.

[0011] Furthermore, the flywheel energy storage device is arranged inside the lower column. A total of three flywheel energy storage devices are arranged in the three-column mechanism, which increases the total energy storage. At the same time, the three-column structure is adopted, and the flywheel energy storage device is arranged at the bottom of the three-column mechanism, which is conducive to lowering the overall center of gravity and resisting the tilting movement of the floating wind turbine platform.

[0012] Furthermore, the flywheel energy storage device includes a vacuum pump, a housing, and a flywheel energy storage body, wherein the vacuum pump is arranged above the housing. The housing forms a cylindrical sealed vacuum chamber, and the vacuum pump is used to evacuate the chamber to reduce the resistance of the flywheel rotation and improve the energy conversion efficiency. The housing is connected to the lower column by welding or bolts to fix the flywheel energy storage device.

[0013] Furthermore, the flywheel energy storage body comprises a first bearing, a motor / generator, a flywheel and a second bearing which are arranged in sequence from top to bottom inside the housing and connected via a shaft core. The outer diameter of the flywheel is equivalent to the inner diameter of the housing.

[0014] Furthermore, due to the gyroscopic effect, the flywheel naturally forms a gyroscopic anti-roll device while rotating at high speed. The stabilizing torque generated by the rotation of the flywheel can be used to resist horizontal loads such as wind, waves, and currents, thereby reducing the sway of the offshore floating wind turbine.

[0015] Furthermore, the three-column wind turbine foundation with flywheel energy storage and self-stability and grid peak regulation is used to achieve grid peak regulation. The specific control method is as follows: the electric / generator is both a motor and a generator. When the power generation of the wind turbine set decreases, it acts as a generator to convert the kinetic energy of the high-speed rotating flywheel into electrical energy; when the power generation of the wind turbine set increases, it acts as a motor to convert the electrical energy into flywheel kinetic energy for storage.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) A three-column floating wind turbine foundation is used, and three flywheel energy storage devices are installed inside it. Through the mutual conversion of electrical 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 storage, the flywheel energy storage has a continuous energy release time of 1s to 15min and a response time of milliseconds. It has the advantages of long continuous energy release time and fast response time.

[0018] (2) Three flywheel energy storage devices are installed at the bottom of the three-column floating wind turbine foundation, which is conducive to lowering the overall center of gravity of the wind turbine system and making the center of gravity further away from the center of buoyancy. When the wind turbine tilts, a larger restoring force is formed between the center of gravity and the center of buoyancy to resist the tilting movement of the platform.

[0019] (3) A three-column floating wind turbine foundation is used, and three flywheel energy storage devices are installed in the three columns. 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 horizontal loads such as wind, waves, and currents, and reduce the swaying of the floating wind turbine. This can reduce the impact of the "wake effect" on the power generation efficiency of the floating wind turbine, and avoid the impact of swaying on the structural stability of the wind turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is an overall perspective view of the three-column fan structure in an embodiment of the present invention;

[0021] Figure 2 It is an overall schematic diagram of the three-column fan structure in an embodiment of the present invention;

[0022] Figure 3 A top view of a three-column fan structure in an embodiment of the present invention;

[0023] Figure 4 Schematic diagram of a flywheel energy storage device in an embodiment of the present invention;

[0024] Figure 5 A top view of a flywheel energy storage device in an embodiment of the present invention;

[0025] Figure 6 It is a three-dimensional schematic diagram of the AA section of the flywheel energy storage device in an embodiment of the present invention;

[0026] Figure 7 It is a side view of the AA section of the flywheel energy storage device in an embodiment of the present invention;

[0027] In the figure: 1. wind turbine; 2. three-column mechanism; 201. truss; 202. upper column; 203. lower column; 3. flywheel energy storage device; 301. vacuum pump; 302. housing; 303. first bearing; 304. vacuum chamber; 305. mandrel; 306. electric / generator; 307. flywheel; 308. second bearing; 4. mooring device; 401. mooring chain; 402. anchor. DETAILED DESCRIPTION

[0028] 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.

[0029] See also Figure 1-7 The present invention provides a specific embodiment of a three-column wind turbine foundation with self-stabilization and flywheel energy storage and a power grid peak regulation control method. In this example, the wind turbine foundation includes a wind turbine 1, a three-column mechanism 2, a flywheel energy storage device 3 and a mooring device 4. A three-column mechanism 2 is provided below the wind turbine 1, and its columns are arranged in an equilateral triangle, and the wind turbine 1 is arranged above the center of gravity of the equilateral triangle. The columns are connected to each other and to the wind turbine by trusses. Each column of the three-column mechanism 2 is composed of an upper column 202 and a lower column 203. The upper column 202 and the lower column 203 together form a hollow cylindrical structure that is closed on the outside and connected on the inside, which provides buoyancy for the wind turbine 1. A flywheel energy storage device 3 is provided in each of the three lower columns 203. The mooring device 4 includes a mooring anchor chain 401 and an anchor 402 . The upper end of the mooring anchor chain 401 is fixed to the lower surface of the lower column 2 , and the lower end is fixed to the anchor 402 .

[0030] The upper column 202 is coaxial with the lower column 203, and the diameter of the lower column 203 is larger than the diameter of the upper column 202. The three-column mechanism provides buoyancy for the wind turbine through the space formed therein, and the lower end of each column is enlarged to form a large space inside, in which a large flywheel energy storage device is arranged. The large-diameter lower column 203 provides space for arranging the large-diameter flywheel energy storage device 3.

[0031] The flywheel energy storage device 3 is arranged inside the lower column 203. A total of three flywheel energy storage devices 3 are arranged in the three-column mechanism 2, which increases the total energy storage. At the same time, the flywheel energy storage device 3 is arranged at the bottom of the three-column mechanism 2, which is conducive to lowering the overall center of gravity and resisting the tilting movement of the floating wind turbine platform.

[0032] The flywheel energy storage device 3 is composed of a vacuum pump 301, a housing 302, a first bearing 303, a vacuum chamber 304, a shaft core 305, a motor / generator 306, a flywheel 307 and a second bearing 308. The vacuum pump 301 is arranged above the housing 302. The sealed housing 302 forms a cylindrical sealed vacuum chamber 304, and the vacuum pump 301 is used to evacuate the flywheel 307 to reduce the resistance to rotation and improve the energy conversion efficiency.

[0033] The first bearing 303, the electric motor / generator 306, the flywheel 307 and the second bearing 308 are arranged in sequence from top to bottom inside the housing 302 of the flywheel energy storage device 3, and are connected through the shaft core 305. The outer diameter of the flywheel 307 is equivalent to the inner diameter of the housing 302. The housing 302 is connected to the lower column 203 by welding or bolts to fix the flywheel energy storage device.

[0034] Due to the gyroscopic effect, the flywheel 307 naturally forms a gyroscopic anti-roll device while rotating at high speed. The stabilizing torque generated by the rotation of the flywheel 307 can be used to resist horizontal loads such as wind, waves, and currents, thereby reducing the sway of the offshore floating wind turbine 1.

[0035] The three-column wind turbine foundation with self-stabilization and flywheel energy storage is used to realize peak load regulation of the power grid. The specific control method is as follows: the electric / generator 306 is both a motor and a generator. When the power generation of the wind turbine set 1 decreases, it acts as a generator to convert the kinetic energy of the high-speed rotating flywheel 307 into electrical energy; when the power generation of the wind turbine set 1 increases, it acts as a motor to convert the electrical energy into the kinetic energy of the flywheel 307 for storage.

[0036] 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 three-column wind turbine foundation with flywheel energy storage and self-stabilization and grid peak regulation, characterized in that: The invention comprises a wind turbine generator set (1), a three-column mechanism (2), a flywheel energy storage device (3) and a mooring device (4); the three-column mechanism (2) comprises three columns arranged in an equilateral triangle; the wind turbine generator set (1) is arranged above the center of gravity of the equilateral triangle; the columns are connected to each other and to the wind turbine generator set through trusses; and a flywheel energy storage device (3) is arranged inside each column.

2. A three-column wind turbine foundation with flywheel energy storage and power grid peak regulation according to claim 1, characterized in that: The mooring devices (4) are divided into three groups, corresponding to three columns respectively. Each group includes a mooring anchor chain (401) and an anchor (402). The upper end of the mooring anchor chain (401) is fixed to the lower surface of the column, and the lower end is fixed to the anchor (402).

3. A three-column wind turbine foundation with flywheel energy storage and power grid peak regulation according to claim 1, characterized in that: Each column of the three-column mechanism (2) is composed of an upper column (202) and a lower column (203); the upper column (202) and the lower column (203) are coaxial; the upper column (202) and the lower column (203) together form a hollow cylindrical structure that is closed on the outside and connected on the inside.

4. A three-column wind turbine foundation with flywheel energy storage and power grid peak regulation according to claim 3, characterized in that: In each column, the diameter of the lower column (203) is greater than the diameter of the upper column (202), and the flywheel energy storage device (3) is arranged in the lower column (203).

5. A three-column wind turbine foundation with flywheel energy storage and power grid peak regulation according to claim 4, characterized in that: The flywheel energy storage device (3) comprises a vacuum pump (301), a housing (302), and a flywheel energy storage body; the vacuum pump (301) is arranged above the housing (302); the housing (302) forms a cylindrical sealed vacuum chamber (304), and a vacuum is drawn by the vacuum pump (301) to reduce the resistance to the rotation of the flywheel (307); the housing (302) and the lower column (203) are connected by welding or bolts to fix the flywheel energy storage device.

6. A three-column wind turbine foundation with flywheel energy storage and power grid peak regulation according to claim 5, characterized in that: The flywheel energy storage body comprises a first bearing (303), a motor / generator (306), a flywheel (307) and a second bearing (308) which are arranged in sequence from top to bottom inside the housing (302) and are connected via a shaft core (305). The outer diameter of the flywheel (307) is equivalent to the inner diameter of the housing (302).

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