Offshore wind turbine coupled energy storage dual floating system

Abstract

The present invention discloses an offshore wind turbine coupled energy storage double floating system, including a tension leg platform and a wind turbine, the wind turbine is installed on the floating base of the tension leg platform; a hydrogen energy storage device is arranged on the tension leg platform, the hydrogen energy storage device can convert electrical energy into hydrogen energy to store and release the wind power generated by the wind turbine; the hydrogen energy storage device is a suspension, and the suspended hydrogen energy storage device is flexibly connected to the floating base; the wind turbine and the hydrogen energy storage device are limitedly matched, the wind turbine produces horizontal constraints on the hydrogen energy storage device, and the flexible connection between the floating base and the hydrogen energy storage device produces vertical constraints on the hydrogen energy storage device; the wind turbine has a vertical tower, and a limited hole is formed on the hydrogen energy storage device; the tower is correspondingly located in the limited hole to produce horizontal constraints on the hydrogen energy storage device; the floating base is connected to the hydrogen energy storage device through a rope body to produce vertical constraints on the hydrogen energy storage device. The present invention can effectively solve the problem of wind abandonment and power restriction of offshore wind power in deep sea areas and improve the utilization rate of wind energy.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to an offshore wind turbine coupled energy storage double floating system. Background Art

[0002] "Wind power curtailment" refers to the phenomenon that wind turbines can operate normally, but stop operating due to insufficient grid absorption capacity, unstable wind power generation, etc. In recent years, as offshore wind resource development has gradually become saturated, offshore wind power is transitioning from offshore and shallow waters to offshore and deep seas. However, wind power in deep sea areas generally has problems of large volatility and poor grid connection stability. The phenomenon of wind power curtailment is relatively serious and needs to be resolved. Summary of the invention

[0003] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides an offshore wind turbine coupled energy storage dual floating system, aiming to solve the problem of wind power abandonment and power rationing in deep-sea offshore wind power and improve the utilization rate of wind energy.

[0004] Technical solution: To achieve the above-mentioned purpose, the offshore wind turbine coupled energy storage double floating system of the present invention includes a tension leg platform and a wind turbine, and the wind turbine is installed on the floating base of the tension leg platform; a hydrogen energy storage device is arranged on the tension leg platform, and the hydrogen energy storage device can convert electrical energy into hydrogen energy to store the wind power generated by the wind turbine; the hydrogen energy storage device is a suspended body, and the suspended hydrogen energy storage device is flexibly connected to the floating base.

[0005] Furthermore, the wind turbine and the hydrogen energy storage device are limitedly matched, the wind turbine exerts horizontal constraints on the hydrogen energy storage device, and the flexible connection between the floating body base and the hydrogen energy storage device exerts vertical constraints on the hydrogen energy storage device.

[0006] Furthermore, the wind turbine has a vertical tower, and a limiting hole is formed on the hydrogen energy storage device; the tower is correspondingly located in the limiting hole to produce horizontal constraints on the hydrogen energy storage device; the floating base is connected to the hydrogen energy storage device through a rope body to produce vertical constraints on the hydrogen energy storage device.

[0007] Furthermore, the floating body base is connected to the hydrogen energy storage device through an elastic rope. When the hydrogen energy storage device swings vertically and moves upward along the tower, the elastic rope exerts a downward elastic force on the hydrogen energy storage device.

[0008] Furthermore, an elastic component is provided on the hydrogen energy storage device, and when the hydrogen energy storage device swings vertically and moves downward along the tower, the elastic component applies an upward elastic force to the hydrogen energy storage device.

[0009] Furthermore, when the hydrogen energy storage device swings vertically along the tower, the hydrogen energy storage device and the tower are in rolling cooperation.

[0010] Furthermore, a pulley is provided inside the limiting hole of the hydrogen energy storage device, a vertical slide rail is provided on the tower, and the pulley and the vertical slide rail are in rolling cooperation.

[0011] Furthermore, the elastic component is an elastic pulley, and when the pulley rolls along the vertical slide rail, elastic extrusion deformation occurs on the pulley surface; a slope section is provided at the lower end of the vertical slide rail, and when the hydrogen energy storage device moves down along the tower, the pulley moves down to the slope section accordingly and increases the deformation degree of the pulley, so as to exert an upward elastic force on the hydrogen energy storage device.

[0012] Furthermore, the external shape of the hydrogen energy storage device is symmetrical, and the limiting hole is located at the corresponding symmetry center of the hydrogen energy storage device; the floating body base is connected to the hydrogen energy storage device through multiple vertical ropes, and the multiple ropes are symmetrically distributed.

[0013] Furthermore, the external shape of the hydrogen energy storage device is an oblate spheroid.

[0014] Beneficial effects: The offshore wind turbine coupled energy storage dual floating system of the present invention has the following beneficial effects:

[0015] 1) Combine offshore wind turbines with hydrogen energy storage devices to convert wind power that cannot be absorbed by the power grid into hydrogen energy for storage, and release it when wind power output is insufficient, so as to improve wind energy utilization and effectively solve the problem of wind power curtailment and power rationing;

[0016] 2) The tension leg platform is connected to the hydrogen energy storage device through an elastic rope, and the hydrogen energy storage device slides with the vertical track on the wind turbine tower through elastic rollers, thereby constraining the hydrogen energy storage device horizontally and vertically, so that the hydrogen energy storage device maintains coordinated movement with the tension leg platform except for heaving swing, and the elastic rope cooperates with the elastic roller to reduce the amplitude of the heaving swing movement of the hydrogen energy storage device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Attached Figure 1 It is a schematic diagram of the connection between the tension leg platform, the wind turbine and the hydrogen energy storage device;

[0018] Attached Figure 2 It is a schematic diagram of the rolling cooperation between the hydrogen energy storage device and the tower;

[0019] Attached Figure 3 is the time history curve of the heave direction movement of the tension leg platform;

[0020] Attached Figure 4 This is the time history curve of the vertical motion of the hydrogen energy storage device. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] As attached Figures 1 to 4 The offshore wind turbine coupled energy storage dual floating system comprises a tension leg platform 1 and a wind turbine 2, as shown in the attached Figure 1 As shown in FIG, the tension leg platform 1 includes a floating base 5 and a plurality of tension tendons 12. The floating base 5 has a plurality of outriggers 11 on the side thereof. The lower ends of the tension tendons 12 are fixed to the seabed, and the upper ends of the tension tendons 12 are connected to the outriggers 11. The wind turbine 2 is installed on the floating base 5 of the tension leg platform 1.

[0023] A hydrogen energy storage device 3 is provided on the tension leg platform 1. The hydrogen energy storage device 3 is composed of a hydrogen production device, a hydrogen storage device and a fuel cell, all of which are placed inside the hydrogen energy storage device 3. The hydrogen energy storage device 3 can convert electrical energy into hydrogen energy to store the wind power generated by the wind turbine 2. The hydrogen production device uses the wind power generated by the wind turbine 2 to electrolyze water to produce green hydrogen, and stores the green hydrogen in the hydrogen storage device to convert electrical energy into hydrogen energy; the fuel cell can use the green hydrogen in the hydrogen storage device to generate electricity and convert hydrogen energy into electrical energy. By setting up the hydrogen energy storage device 3 on the tension leg platform 1, "one machine and one storage" is realized, which effectively solves the problems of wind power abandonment, power rationing and poor grid connection stability that are common in offshore wind power.

[0024] The floating body base 5 is located below the sea surface, and the hydrogen energy storage device 3 is a suspended body. The suspended hydrogen energy storage device 3 is flexibly connected to the floating body base 5. Since the floating body base 5 and the hydrogen energy storage device 3 are flexibly connected, the installation of the hydrogen energy storage device 3 on the tension leg platform 1 will not increase the upper load of the floating body base 5. In addition, the use of the tension leg type wind turbine platform as the basic body of the hydrogen energy storage device 3 can give full play to the advantage of the good stability of the tension leg platform 1, and ensure the safe and stable operation of the hydrogen production device and the hydrogen storage device.

[0025] The wind turbine 2 and the hydrogen energy storage device 3 are limited and cooperated, the wind turbine 2 produces horizontal constraints on the hydrogen energy storage device 3, and the flexible connection between the floating base 5 and the hydrogen energy storage device 3 produces vertical constraints on the hydrogen energy storage device 3, so that the hydrogen energy storage device 3 and the tension leg platform 1 can achieve coordinated movement in the five degrees of freedom of sway, pitch, bow pitch, roll and pitch except heave, and can fully utilize the vertical near-rigidity characteristics of the tension leg platform 1 to reduce the heave movement of the hydrogen energy storage device 3.

[0026] The wind turbine 2 has a vertical tower 4, and a limiting hole 6 is formed on the hydrogen energy storage device 3. The tower 4 is correspondingly located in the limiting hole 6, so that the wind turbine 2 and the hydrogen energy storage device 3 are limited and matched, and the tower 4 of the wind turbine 2 exerts horizontal constraints on the hydrogen energy storage device 3. The floating body base 5 is connected to the hydrogen energy storage device 3 through a rope body, and the rope body is a tensioned mooring cable, so that the floating body base 5 exerts vertical constraints on the hydrogen energy storage device 3.

[0027] The floating body base 5 is connected to the hydrogen energy storage device 3 through an elastic rope 7. When the hydrogen energy storage device 3 swings up and moves up along the tower 4, the elastic rope 7 applies a downward elastic force to the hydrogen energy storage device 3. When the hydrogen energy storage device 3 swings up and moves up along the tower 4, an upward pulling force is applied to the tension leg platform 1 through the rope body, resulting in an increase in the mooring tension of the tension tendon 12. Since the rope body is an elastic rope 7, the elastic rope 7 will undergo elastic deformation, and the deformation of the elastic rope 7 will absorb part of the energy, thereby reducing the pulling force of the hydrogen energy storage device 3 on the tension leg platform 1, thereby reducing the increase in the mooring tension of the tension tendon 12, so as to extend the fatigue life of the tension tendon 12.

[0028] When the tension leg platform 1 at the initial position is suddenly subjected to wave load, a large motion response that does not conform to the law of motion will be generated. When there is only an elastic rope 7 between the tension leg platform 1 and the hydrogen energy storage device 3, it can be obtained Figure 3 , where the initial equilibrium position of the heave motion of the tension leg platform 1 is -5m. Figure 3 The red curve in the figure is the time history curve of the heave direction motion of the single tension leg platform 1, namely, TLP; Figure 3 The black curve in FIG. 1 is a time history curve of the heave direction motion of the tension leg platform 1 coupled with the hydrogen energy storage device 3, namely, TLPCH.

[0029] Comparing the two curves, it can be seen that compared with the single tension leg platform 1, the oscillation amplitude and frequency of the heave direction motion response of the tension leg platform 1 coupled with the hydrogen energy storage device 3 are increased. This is because the hydrogen energy storage unit and the tension leg platform 1 are connected by elastic ropes 7. The tension and relaxation of the elastic ropes 7 will cause the oscillation amplitude and frequency of the tension leg platform 1 and the hydrogen energy storage unit to increase. Although the increase in the heave direction is large, the magnitude of the motion response is small, about 10-3m, so the impact on the overall structural stability can be ignored.

[0030] When there is only an elastic rope 7 between the tension leg platform 1 and the hydrogen energy storage device 3, it can be obtained that Figure 4 The time history curve of the heave motion of the hydrogen energy storage device 3 is shown in the figure, where the red dotted line represents the initial center of gravity of the hydrogen energy storage device 3, that is, the center of gravity is located 1m underwater. Figure 4 The analysis shows that the average and maximum values ​​of the heave motion response of the hydrogen energy storage device 3 are 0.172m and 0.721m respectively. Compared with the magnitude of the heave motion response of the TLPCH platform, the magnitude of the heave motion response of the hydrogen energy storage device 3 is larger. Figure 4 It is observed that due to the presence of the elastic rope 7, the amplitude of the upward swing of the hydrogen energy storage device 3 is small, but the amplitude of the downward swing of the hydrogen energy storage device 3 is large, which means that when there is only the elastic rope 7 between the tension leg platform 1 and the hydrogen energy storage device 3, the stability of the hydrogen energy storage device 3 is poor.

[0031] Therefore, in order to reduce the motion response of the hydrogen energy storage device 3 in the heave direction, an elastic component is provided on the hydrogen energy storage device 3. When the hydrogen energy storage device 3 heaves and moves down along the tower 4, the elastic component exerts an upward elastic force on the hydrogen energy storage device 3, thereby reducing the amplitude of the heave downward movement of the hydrogen energy storage device 3 and improving the stability of the hydrogen energy storage device 3. Figure 3 It can be seen that when the hydrogen energy storage device 3 applies elastic force to the TLPCH platform through the elastic rope 7, the heave motion response magnitude of the TLPCH platform is relatively small, and the influence on the stability of the TLPCH platform can be ignored. Therefore, when the hydrogen energy storage device 3 applies elastic force to the TLPCH platform through the elastic component, the influence on the stability of the TLPCH platform can also be ignored.

[0032] When the hydrogen energy storage device 3 swings vertically along the tower 4, the hydrogen energy storage device 3 and the tower 4 are in rolling cooperation with each other to reduce the friction between the hydrogen energy storage device 3 and the tower 4. Figure 2 As shown in , a pulley 8 is arranged inside the limiting hole 6 of the hydrogen energy storage device 3, and a vertical slide rail 9 is arranged on the tower 4, and the pulley 8 and the vertical slide rail 9 are in rolling cooperation.

[0033] The elastic component is an elastic pulley 8. When the pulley 8 rolls along the vertical slide rail 9, the surface of the pulley 8 produces elastic extrusion deformation; the lower end of the vertical slide rail 9 is provided with a ramp section 10. When the hydrogen energy storage device 3 moves down along the tower 4, the pulley 8 moves down to the ramp section 10 accordingly and increases the deformation degree of the pulley 8, so as to apply an upward elastic force to the hydrogen energy storage device 3. The elastic pulley 8 cooperates with the ramp section 10 to reduce the amplitude of the downward movement of the hydrogen energy storage device 3. In addition, there are multiple groups of pulleys 8 arranged in a ring direction between the hydrogen energy storage device 3 and the tower 4, and because the pulley 8 is elastic, the hydrogen energy storage device 3 and the tower 4 can fit tightly. If the pulley 8 is rigid, a gap is easily generated between the pulley 8 and the vertical slide rail 9 on the tower 4. When the hydrogen energy storage device 3 is subjected to the action of waves, if there is a gap between the pulley 8 and the slide rail, the hydrogen energy storage device 3 is prone to produce a large motion response, causing damage to the tower 4.

[0034] The external shape of the hydrogen energy storage device 3 is symmetrical, and the limiting hole 6 is located at the symmetry center of the hydrogen energy storage device 3. The floating body base 5 is connected to the hydrogen energy storage device 3 through multiple vertical ropes, and the multiple ropes are symmetrically distributed, making the hydrogen energy storage device 3 more stable.

[0035] The outer shape of the hydrogen energy storage device 3 is an oblate spheroid that is flattened up and down, forming a streamlined design. The streamlined design can reduce the wave load on the hydrogen energy storage device 3. The shape of the oblate spheroid can also increase the outer edge strength of the hydrogen energy storage device 3, achieving the function of resisting ice cones, so that it can be deployed in high-latitude low-temperature waters.

[0036] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. Offshore wind turbine coupled energy storage dual floating system, characterized by: The invention comprises a tension leg platform (1) and a wind turbine (2), wherein the wind turbine (2) is installed on a floating body base (5) of the tension leg platform (1); a hydrogen energy storage device (3) is arranged on the tension leg platform (1), and the hydrogen energy storage device (3) can convert electrical energy into hydrogen energy to store wind power generated by the wind turbine (2); the hydrogen energy storage device (3) is a suspended body, and the suspended hydrogen energy storage device (3) is flexibly connected to the floating body base (5); The wind turbine (2) and the hydrogen energy storage device (3) are limitedly matched, the wind turbine (2) generates horizontal constraints on the hydrogen energy storage device (3), and the flexible connection between the floating body base (5) and the hydrogen energy storage device (3) generates vertical constraints on the hydrogen energy storage device (3); The wind turbine (2) has a vertical tower (4), and a limiting hole (6) is formed on the hydrogen energy storage device (3); the tower (4) is correspondingly located in the limiting hole (6) to generate horizontal constraints on the hydrogen energy storage device (3); the floating body base (5) is connected to the hydrogen energy storage device (3) through a rope body to generate vertical constraints on the hydrogen energy storage device (3); The floating body base (5) is connected to the hydrogen energy storage device (3) via an elastic rope (7); when the hydrogen energy storage device (3) swings vertically and moves upward along the tower (4), the elastic rope (7) applies a downward elastic force to the hydrogen energy storage device (3); The hydrogen energy storage device (3) is provided with an elastic component, and when the hydrogen energy storage device (3) swings vertically and moves downward along the tower (4), the elastic component applies an upward elastic force to the hydrogen energy storage device (3); When the hydrogen energy storage device (3) swings vertically along the tower (4), the hydrogen energy storage device (3) and the tower (4) are in rolling cooperation; A pulley (8) is arranged inside the limiting hole (6) of the hydrogen energy storage device (3), a vertical slide rail (9) is arranged on the tower (4), and the pulley (8) and the vertical slide rail (9) are in rolling cooperation; The elastic component is an elastic pulley (8). When the pulley (8) rolls along the vertical slide rail (9), elastic extrusion deformation occurs on the surface of the pulley (8). A slope section (10) is provided at the lower end of the vertical slide rail (9). When the hydrogen energy storage device (3) moves downward along the tower (4), the pulley (8) moves downward to the slope section (10) accordingly and increases the degree of deformation of the pulley (8), so as to apply an upward elastic force to the hydrogen energy storage device (3).

2. The offshore wind turbine coupled energy storage dual floating system according to claim 1 is characterized in that: The external shape of the hydrogen energy storage device (3) is symmetrical, and the limiting hole (6) is located at the corresponding symmetry center of the hydrogen energy storage device (3); the floating body base (5) is connected to the hydrogen energy storage device (3) through a plurality of vertical ropes, and the plurality of ropes are symmetrically distributed.

3. The offshore wind turbine coupled energy storage dual floating system according to claim 2 is characterized in that: The external shape of the hydrogen energy storage device (3) is an oblate spheroid.

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