CN111498036A - Offshore floating wind turbine generator with energy storage device and electric energy consumption method - Google Patents

Abstract

The invention discloses an offshore floating wind turbine with an energy storage device and an electric energy consumption method, wherein the wind turbine comprises a fan, a tower, a box structure and a plurality of gas storage tanks; from top to bottom, the fan, the tower drum and the box body structure are sequentially connected, the air storage tank is arranged at equal intervals on the periphery of the box body structure, a compressor and a micro turbine are arranged in the box body structure, and the compressor is communicated with an inlet of the air storage tank; the outlet of the air storage tank is communicated with a working medium inlet of the micro turbine, and compressed air is filled in the air storage tank; an anchoring support is arranged on the periphery of the box body structure and is connected with an anchoring device through a catenary, and the anchoring device is fixed on the seabed; a counterweight is arranged in the box body structure; the electric energy input end of the compressor is connected with the electric energy output end of the wind turbine generator; compressed air in the air storage tank is used as an energy storage medium, and meanwhile buoyancy can be provided for the fan, so that the acting force of wind waves on the fan is reduced, the stability of the fan is kept, and meanwhile, the compressed air can be used for absorbing electric energy of the wind turbine.

Description

An offshore floating wind turbine with energy storage device and electric energy consumption method

technical field

The invention belongs to the technical field of offshore wind power, and in particular relates to an offshore floating wind generator set with an energy storage device and a method for absorbing electric energy.

Background technique

Compared with onshore wind power, offshore wind power has the advantages of abundant wind energy resources, suitable for large-scale development, and no visual and noise pollution. Offshore, due to the shallow water depth, the wind turbines use fixed foundations. However, in the deep sea area, the fixed foundation construction cost is too high, and various problems such as fatigue and deformation are prone to occur. Therefore, the deep sea wind power will adopt a new type of floating wind turbine.

As a kind of renewable energy, wind energy also has the characteristics of unstable energy and poor grid friendliness. Energy storage is an effective means to solve the intermittent problem of renewable energy. CN110611332A discloses an offshore wind power system energy storage device and its control method. The fuzzy PID control algorithm of the energy storage unit is used to realize the virtual control of the energy storage and the offshore wind farm to make the power grid more stable, but the invention is mainly designed from the control point of view. CN106762420B discloses an offshore wind power non-supplementary combustion compressed air constant pressure energy storage device, but all piston-type air storage tanks of the device are installed on the seabed foundation, which is not suitable for deep sea areas with large water depth. CN110657067A discloses an offshore wind power compressed air energy storage type heat storage device and a working method, but the device adopts an indirect cooling design, and the system is relatively complicated.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an offshore floating wind turbine with an energy storage device and a method for absorbing electric energy. The compressed air in the air storage tank is used as the energy storage medium, and can provide buoyancy for the fan at the same time, reducing the force of wind and waves on the fan , keep the fan stable.

In order to achieve the above purpose, the technical solution adopted in the present invention is an offshore floating wind turbine with an energy storage device, including a fan, a tower, a box structure and a number of gas storage tanks; from top to bottom, the fan, the tower The cylinder and the box structure are connected in sequence, and the gas storage tanks are arranged at equal intervals around the box structure. The box structure is provided with a compressor and a micro-turbine, and the inlet of the compressor and the gas storage tank are connected; the outlet of the gas storage tank is connected. Connected to the working fluid inlet of the micro-turbine, and the air storage tank is filled with compressed air;

Anchoring brackets are arranged around the box structure, and the anchoring brackets are connected to the anchoring device through catenary wires, and the anchoring device is fixed on the seabed; a counterweight is arranged in the box structure; the electric energy input end of the compressor is connected to the electric energy of the wind turbine. output.

An electric heater, a thermometer and a pressure measuring device are set in the gas storage tank.

The box structure and the gas storage tank are connected by the cantilever beam of the gas storage tank.

The cantilever beam of the gas storage tank adopts a rod structure or a truss structure, and one or more diagonal struts are arranged to connect the box structure and the cantilever beam of the gas storage tank.

The gas storage tanks are evenly distributed around the box structure, the compressor and the micro-turbine are communicated with the gas storage tank through a gas pipeline, and the gas pipeline is arranged on the cantilever beam of the gas storage tank.

The gas storage tank is spherical or cylindrical, and the gas storage tank is made of elastic material.

The tank body of the gas storage tank is made of elastic material.

The number of anchoring brackets, catenary lines and anchoring devices is 3 to 6, and they are evenly arranged on the circumference of the box structure. The anchoring devices are fixed on the seabed. Fixed connection.

A corrosion-resistant layer is provided on the outer surface of the box structure, the cantilever beam of the gas storage tank, the gas storage tank and the anchoring bracket.

A method for consuming electric energy of an offshore floating wind turbine. When the power generated by the fan can not be fully connected to the grid, the compressor works to compress air to an air storage tank, and the compressed air is stored in the air storage tank; when the output of the fan is reduced, the compressed air flows from The air tank is output to the micro-turbine, and the micro-turbine works to convert the kinetic energy of the compressed air into electrical energy.

Compared with the prior art, the present invention at least has the following beneficial effects:

In the offshore floating wind turbine with energy storage device of the present invention, the air storage tank equipped with compressed air can generate buoyancy, support the weight of the entire fan, and play a similar role as a buoy; the air storage tanks are evenly arranged through the cantilever beam On the circumference with the fan as the center, the buoyancy is more uniform, the auxiliary anchoring device anchors the fan, and the overall structure of the fan is more stable; the excess power generation of the fan can drive the compressor in the box structure to inhale and compress the air, and then send it to the air. into the air storage tank to increase the compressed air pressure in the air storage tank to realize energy storage. When the power generation of the fan decreases, part of the compressed air in the air storage tank enters the micro-turbine in the box structure, converts it into electric energy, reduces the power consumption of the fan The power generation fluctuation of the whole period, the unit of the invention can improve the stability and power generation performance of the offshore floating wind power unit, and has good economic benefits and application prospects.

Further, the cantilever beam adopts a truss-type structure or is used in combination with diagonal struts, which can provide stable support, reduce the weight of the fan foundation, and reduce manufacturing costs.

Further, according to the weight and load analysis of the overall structure of the fan, the number and capacity of the compressed air storage tanks are selected to ensure the stability of the overall structure of the fan.

Further, the volume of the air storage tank can be changed with the compressed air pressure within a certain range, the buoyancy can be controlled, the tension of the catenary can be relieved, and the fan can be stabilized together with the anchoring device.

Further, the change in the volume of the gas storage tank causes the overall wind turbine to float or sink within a certain range, which can adjust the wind and wave force of the wind turbine to improve power generation adaptability and structural stability.

Further, according to the actual situation, the number of catenary wires and the fixing method with the anchoring device are selected to achieve the most stable fixing method.

Further, the box structure, the cantilever beam, the gas storage tank and the outer surface of the anchoring bracket are all provided with a corrosion-resistant layer, which can prevent the damage to the device caused by seawater corrosion and improve the life and safety of the device.

Description of drawings

1 is a schematic structural diagram of Embodiment 1 of the present invention;

2 is a schematic structural diagram of Embodiment 2 of the present invention;

In the picture: 1-fan, 2-tower, 3-transition section, 4-box structure, 5-cantilever beam of air storage tank, 6-air storage tank, 7-anchoring bracket, 8-catenary wire, 9 -Anchoring device.

Detailed ways

The present invention is described in further detail below in conjunction with the accompanying drawings and specific embodiments, and its content is to explain rather than limit the present invention:

An offshore floating wind turbine with an energy storage device, including a fan 1, a tower 2, a box structure 4 and a number of gas storage tanks 6; from top to bottom, the fan 1, the tower 2 and the box structure 4 are sequentially Connection, the gas storage tank 6 is arranged at equal intervals around the box structure 4, the box structure 4 is provided with a compressor and a micro-turbine, the compressor and the inlet of the gas storage tank 6 are connected; the outlet of the gas storage tank 6 is connected The working fluid inlet of the micro-turbine, the air storage tank 6 is filled with compressed air;

An anchoring bracket 7 is arranged around the box structure 4, and the anchoring bracket 7 is connected to the anchoring device 9 through the catenary 8, and the anchoring device 9 is fixed on the seabed; the box structure 4 is provided with a counterweight; the electric energy of the compressor The input end is connected to the electric energy output end of the wind turbine.

Example 1

As shown in Figure 1, the offshore floating wind turbine with compressed air energy storage of the present invention includes a fan 1, a tower 2, a transition section 3, a box structure 4, an air storage tank cantilever beam 5, an air storage tank 6, an anchor The fixed bracket 7, the catenary wire 8 and the anchoring device 9; the fan 1, the tower 2, the transition section 3, and the box structure 4 are fixedly connected by flanges in sequence. The three cantilever beams 5 of the gas storage tank are fixedly connected to the box structure 4 and are evenly distributed on the circumference of the box structure. The cantilever beam of each gas storage tank is about 20 meters long, and there are diagonal braces to keep it stable. The end of the cantilever beam 5 of the gas storage tank is connected to the gas storage tank 6. There are compressed air pipelines and electrical pipelines in the cantilever beam of the gas storage tank. Each gas storage tank is cylindrical with a diameter of 10 meters and a length of 20 meters, with a volume of 1500 cubic meter; the outer wall of the gas storage tank is made of high-strength film material, which is elastic and can withstand the pressure of 1 to 3 atmospheres. The volume of the gas storage tank can expand and contract with the change of the compressed air pressure. There are also three anchoring brackets 7 extending from the box structure 4 , the anchoring brackets are 10 meters long, and the ends of the brackets are connected with the anchoring device 9 by the catenary 8 . The anchoring device 9 is fixed on the seabed and plays the role of fixing the wind turbine.

The box structure 4, the cantilever beam 5 of the gas storage tank, and the anchoring bracket 7 are all made of 316 stainless steel, and the surface is processed with an anti-corrosion layer for anti-corrosion treatment.

Example 2

As shown in Figure 2, the offshore floating wind turbine with compressed air energy storage of the present invention includes a fan 1, a tower 2, a transition section 3, a box structure 4, an air storage tank cantilever beam 5, an air storage tank 6, an anchor Fixed bracket 7 , catenary wire 8 and anchoring device 9 . The fan 1, the tower tube 2, the transition section 3, and the box structure 4 are in turn fixedly connected by flanges. Four cantilever beams 5 of the gas storage tank are fixedly connected to the box structure 4 and are evenly distributed on the circumference of the box structure. The cantilever beam of the gas storage tank is a triangular truss structure, each about 20 meters long. The end of the cantilever beam 5 of the gas storage tank is connected with the gas storage tank 6, and there are compressed air pipelines and electrical pipelines in the cantilever beam of the gas storage tank. Each gas storage tank is a sphere with a diameter of 8 meters and a volume of 250 cubic meters. The outer wall of the gas storage tank is made of high-strength film material, which is elastic and can withstand the pressure of 1 to 3 atmospheres. The volume of the gas storage tank can expand and contract with the change of the compressed air pressure. There are also four anchoring brackets 7 extending from the box structure 4 , the anchoring brackets are 10 meters long, and the ends of the brackets are connected with the anchoring device 9 by the catenary 8 . The anchoring device 9 is fixed on the seabed and plays the role of fixing the wind turbine. The box structure 4, the cantilever beam 5 of the gas storage tank and the anchoring bracket 7 are all made of 316 stainless steel, and the surface is treated with anti-corrosion.

Effect verification:

After the offshore floating wind turbine with energy storage device of the present invention is adopted, the excess power generation of the floating fan can be stored in the form of compressed air. When the output of the fan is reduced, the compressed air energy is converted into electric energy, which reduces the power generation of the wind turbine. fluctuations, and improve the friendliness of offshore wind turbines to the grid. The air storage tank with compressed air is evenly arranged around the fan, and the buoyancy is even, which effectively improves the overall structural stability of the fan. The volume of the air storage tank can be changed with the change of the compressed air pressure, so that the whole fan can float or sink within a certain range, and the wind and wave force of the fan can be adjusted to further improve the adaptability and structural stability of power generation.

It should be noted that the above is only one of the embodiments of the present invention, and equivalent changes made by the system described in the present invention are all included in the protection scope of the present invention. Those skilled in the art to which the present invention pertains can substitute the described specific examples in a similar manner, as long as they do not deviate from the structure of the present invention or go beyond the scope defined by the claims, they all belong to the protection scope of the present invention.

Claims (10)

1. An offshore floating wind turbine with an energy storage device, characterized in that it comprises a fan (1), a tower (2), a box structure (4) and several gas storage tanks (6); down, the fan (1), the tower (2) and the box structure (4) are connected in sequence, the gas storage tanks (6) are arranged at equal intervals around the box structure (4), and the box structure (4) is provided with The compressor and the micro-turbine are connected with the inlet of the compressor and the gas storage tank (6); the outlet of the gas storage tank (6) is connected with the working medium inlet of the micro-turbine, and the gas storage tank (6) is filled with compressed air ; An anchoring bracket (7) is arranged around the box structure (4), the anchoring bracket (7) is connected to the anchoring device (9) through the catenary (8), and the anchoring device (9) is fixed on the seabed; The structure (4) is provided with a counterweight; the electric energy input end of the compressor is connected to the electric energy output end of the wind turbine. 2. The offshore floating wind turbine with energy storage device according to claim 1, characterized in that, an electric heater, a thermometer and a pressure measuring device are provided in the gas storage tank (6), and the gas storage tank (6) adopts Made of elastic material. 3. The offshore floating wind turbine with energy storage device according to claim 1, wherein the box structure (4) and the gas storage tank (6) are connected by the gas storage tank cantilever beam (5) . 4. The offshore floating wind turbine with energy storage device according to claim 3, wherein the cantilever beam (5) of the gas storage tank adopts a rod structure or a truss structure, and one or more diagonal struts are provided. The box structure (4) is connected with the cantilever beam (5) of the gas storage tank. 5. The offshore floating wind turbine with energy storage device according to claim 1, wherein the gas storage tanks (6) are evenly distributed around the box structure (4), and the compressor and the micro-turbine pass through The gas pipeline is communicated with the gas storage tank (6), and the gas pipeline is arranged on the cantilever beam (5) of the gas storage tank. 6 . The offshore floating wind turbine with energy storage device according to claim 1 , wherein the gas storage tank ( 6 ) adopts spherical or cylindrical shape. 7 . 7 . The offshore floating wind turbine with energy storage device according to claim 1 , wherein the tank body of the gas storage tank ( 6 ) is made of elastic material. 8 . 8 . The offshore floating wind turbine with energy storage device according to claim 1 , wherein the number of anchor brackets ( 7 ), catenary wires ( 8 ) and anchor devices ( 9 ) ranges from 3 to 3 . 6, which are evenly arranged on the circumference of the periphery of the box structure, the anchoring devices are fixed on the seabed, and each catenary (8) is fixedly connected with 1 to 3 anchoring devices (9). 9. The offshore floating wind turbine with energy storage device according to claim 1, characterized in that the box structure (4), the gas storage tank cantilever beam (5), the gas storage tank (6) and the anchorage The outer surface of the bracket (7) is provided with a corrosion-resistant layer. 10. A method for absorbing electric energy of an offshore floating wind turbine, characterized in that when the power generated by the fan can be completely connected to the grid, the compressor works to compress air to the air storage tank (6), and the compressed air is stored in the air storage tank ; When the output of the fan is reduced, the compressed air is output from the air storage tank (6) to the micro-turbine, and the micro-turbine works to convert the kinetic energy of the compressed air into electrical energy.

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