A floating offshore wind power device

Abstract

The present invention relates to the technical field of offshore wind power, and discloses a floating offshore wind power device, which includes a first floating platform, a vertical axis wind power generation device, a support frame, a cable, and a first power transmission line; the vertical axis wind power generation device includes a rotating shaft, a generator, and wind blades, and the generator and each wind blade are connected to the rotating shaft; the rotating shaft is arranged vertically, the bottom end of the rotating shaft is rotatably connected to the first floating platform, the top end of the rotating shaft is rotatably connected to the support frame, both ends of the cable are respectively connected to the first floating platform and the support frame, and the first power transmission line is electrically connected to the generator and is hung on the support frame. The first power transmission line of the present invention is hung on the top end of the rotating shaft of the vertical axis wind power generation device through the support frame. The height of the rotating shaft is relatively high, and the first power transmission line does not hinder the normal passage of ships and there is no need to additionally provide a support frame, so the economic cost is low. Moreover, compared with the prior art, the overall structure of the present invention has a lower height, resulting in a higher safety factor and a smaller technical difficulty.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power, and particularly to a floating offshore wind power device. Background Art

[0002] Offshore wind power is one of the high-quality new energy resources and is of great significance to the low-carbon transformation of electricity. As wind power generation gradually develops from shallow sea areas to deep sea areas, fixed offshore wind power devices have become difficult to meet the requirements of deep sea areas. The construction cost of fixed offshore wind power devices is relatively high, while floating offshore wind power devices have better economy. In order to improve the utilization rate of wind resources, existing floating offshore wind power devices usually adopt a vertical-axis wind power generation structure. To avoid affecting the normal passage of ships at sea, the height of cable erection is relatively high, and the vertical-axis wind power generation structure is arranged on top of the cable, which makes the overall structure of the offshore wind power device relatively high and poses certain safety risks, increasing the technical difficulty and economic cost. Summary of the Invention

[0003] The purpose of the present invention is to provide a floating offshore wind power device to solve the problem of high cost of existing floating offshore wind power devices.

[0004] To achieve the above purpose, the present invention provides a floating offshore wind power device, including a first floating platform, a vertical-axis wind power generation device, a support frame, a cable and a first power transmission line;

[0005] The vertical-axis wind power generation device includes a rotating shaft, a generator and wind blades, and the generator and each wind blade are connected to the rotating shaft; the rotating shaft is vertically arranged, the bottom end of the rotating shaft is rotatably connected to the first floating platform, the top end of the rotating shaft is rotatably connected to the support frame, and both ends of the cable are respectively connected to the first floating platform and the support frame; the first power transmission line is electrically connected to the generator and is hung on the support frame.

[0006] Further, it further includes a second floating platform, a second power transmission line and a horizontal-axis wind power generation device arranged on the second floating platform. The second floating platform is arranged at an interval from the first floating platform. The second power transmission line is electrically connected to the horizontal-axis wind power generation device, is hung on the support frame and is electrically connected to the first power transmission line.

[0007] Further, first substations are respectively arranged on the first floating platform and the second floating platform. The first substation on the first floating platform is electrically connected to the generator, and the first substation on the second floating platform is electrically connected to the horizontal-axis wind power generation device.

[0008] Further, it further includes a third floating platform, a third transmission line, and a second substation disposed on the third floating platform. The third floating platform is spaced apart from the first floating platform and the second floating platform respectively. The second substation is electrically connected to each of the first substations through the third transmission line.

[0009] Further, the third transmission line includes a first cable and a second cable. The second substation is electrically connected to each of the first substations through the first cable. The first cable extends towards the seabed at the first substation and also extends towards the seabed at the second substation, such that at least a part of the connected first cable is in seawater and has a certain distance from the sea level. The second substation is electrically connected to the first transmission line or the second transmission line through the second cable. The second cable extends upwards from the top of the second substation and connects to the second transmission line or the first transmission line.

[0010] Further, the first floating platform, the second floating platform, and the third floating platform have the same structure, and each includes a body, a mooring cable, and an anchor. The anchor is used for anchoring the seabed. Two ends of the mooring cable are respectively connected to the body and the anchor. The shaft is rotatably connected to the body of the first floating platform. The body of the first floating platform is further provided with the cable and the first substation. The body of the second floating platform is provided with the horizontal axis wind power generation device and the first substation. The second substation is disposed on the body of the third floating platform.

[0011] Further, the support frame includes an upper cross arm, a lower cross arm, and a sleeve connecting the upper cross arm and the lower cross arm. The upper cross arm and the lower cross arm are arranged vertically. The sleeve is rotatably connected to the shaft. The first transmission line and the second transmission line are hung on the upper cross arm or the lower cross arm. The lower cross arm is further connected to the cable.

[0012] Further, the upper cross arm and the lower cross arm are respectively further provided with insulator strings for hanging the first transmission line and the second transmission line.

[0013] Further, a bearing is provided in the sleeve. The sleeve is rotatably connected to the shaft through the bearing.

[0014] Further, the cross-section of the wind blade in the vertical direction is arc-shaped. Two ends of the wind blade are respectively connected to the top end and the bottom end of the shaft.

[0015] In comparison with the prior art, the floating offshore wind power device according to an embodiment of the present invention has the following beneficial effects: The first power transmission line is hung at the top of the rotating shaft of the vertical axis wind power device through a support frame. Since the height of the rotating shaft is relatively high, the first power transmission line does not hinder the normal passage of ships and there is no need to separately set up a support frame, resulting in low economic costs. Moreover, compared with the prior art, the overall structure of the present invention has a lower height, which makes the safety factor higher and the technical difficulty smaller. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a structural diagram of the offshore wind power device according to the first embodiment of the present invention;

[0017] Figure 2 is a front view of the vertical axis wind power device and the first floating platform according to the first embodiment of the present invention;

[0018] Figure 3 is a side view of the vertical axis wind power device and the first floating platform according to the first embodiment of the present invention;

[0019] Figure 4 is a structural diagram of the offshore wind power device according to the second embodiment of the present invention;

[0020] In the figure, 100, offshore wind power device; 1, first floating platform;

[0021] 2, vertical axis wind power device; 21, rotating shaft; 22, generator; 23, wind blade;

[0022] 3, support frame; 31, upper cross arm; 32, lower cross arm; 33, sleeve; 4, cable;

[0023] 5, seabed; 6, second floating platform; 7, horizontal axis wind power device;

[0024] 8, first substation; 9, third floating platform; 91, body; 92, mooring cable;

[0025] 93, anchor; 10, second substation; 11, insulator string; 12, first power transmission line;

[0026] 13, second power transmission line; 14, third power transmission line; 141, first cable; 142, second cable. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The following further describes in detail the specific embodiments of the present invention in conjunction with the drawings and embodiments. The following embodiments are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0028] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", etc. in the present invention is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0029] As Figure 1 shown, a floating offshore wind power device 100 according to the first embodiment of the present invention includes a first floating platform 1, a vertical axis wind power generation device 2, a support frame 3, a cable 4, and a first power transmission line 12. The vertical axis wind power generation device 2 includes a rotating shaft 21, a generator 22, and wind blades 23. The generator 22 and each of the wind blades 23 are connected to the rotating shaft 21. The rotating shaft 21 is vertically arranged, and the bottom end of the rotating shaft 21 is rotatably connected to the first floating platform 1, and the top end of the rotating shaft 21 is rotatably connected to the support frame 3. Both ends of the cable 4 are respectively connected to the first floating platform 1 and the support frame 3. The first power transmission line 12 is electrically connected to the generator 22 and the first power transmission line 12 is hung on the support frame 3.

[0030] Based on this, when the sea breeze blows the wind blades 23, the wind blades 23 drive the rotating shaft 21 to rotate. The rotating shaft 21 transmits mechanical energy to the generator 22, and the generator 22 converts mechanical energy into electrical energy. The electrical energy is transmitted to the onshore power grid through the first power transmission line 12. In the first embodiment of the present invention, the vertical axis wind power generation device 2 is used to convert wind energy into electrical energy. The wind blades 23 of the vertical axis wind power generation device 2 can rotate without facing the wind, and the wind energy utilization rate is high. Moreover, the first power transmission line 12 is arranged overhead, and the construction cost is lower than that of the submarine power transmission line. It is easy to repair and maintain, and the construction difficulty is small. And in the first embodiment of the present invention, the first power transmission line 12 is hung on the top end of the rotating shaft 21 of the vertical axis wind power generation device 2 through the support frame 3. The height of the rotating shaft 21 is relatively high. The first power transmission line 12 does not hinder the normal passage of ships and there is no need to separately set up a support frame 3, and the economic cost is low. Moreover, compared with the prior art, the overall structure of the present invention is lower in height, resulting in a higher safety factor and a smaller technical difficulty.

[0031] Furthermore, in order to increase the windward area and improve the wind energy utilization rate, the cross-section of the wind blade 23 in the vertical direction is arc-shaped, and both ends of the wind blade 23 are respectively connected to the top end and the bottom end of the rotating shaft 21.

[0032] To further improve wind energy utilization, the offshore wind turbine 100 of the first embodiment of the present invention further includes a second floating platform 6, a second transmission line 13, and a horizontal-axis wind turbine 7 mounted on the second floating platform 6. The second floating platform 6 is spaced apart from the first floating platform 1. The second transmission line 13 is electrically connected to the horizontal-axis wind turbine 7. The second transmission line 13 is suspended from the support frame 3 and electrically connected to the first transmission line 12. Therefore, when the sea breeze blows on the blades of the horizontal-axis wind turbine 7, the horizontal-axis wind turbine 7 converts the wind energy into electrical energy, which is then transmitted to the onshore power grid via the second transmission line 13. Specifically, the first transmission line 12 is also electrically connected to the second transmission line 13, enabling grid connection of the offshore wind turbine 100's power system. The electrical energy converted by the horizontal-axis wind turbine 7 and the vertical-axis wind turbine 2 is uniformly transmitted to the onshore power grid via the first transmission line 12, thereby improving the reliability, safety, and flexibility of the offshore wind turbine 100's power system.

[0033] Furthermore, the distance of electric energy transmission is long. In order to reduce the loss of electric energy in the transmission line and improve the electric energy transmission capacity, a first substation 8 is respectively provided on the first floating platform 1 and the second floating platform 6. The first substation 8 on the first floating platform 1 is electrically connected to the generator 22, and the first substation 8 on the second floating platform 6 is electrically connected to the horizontal-axis wind power generation device 7. The first substation 8 on the first floating platform 1 is used to perform a primary boost on the direct current converted by the vertical-axis wind power generation device 2, and the first substation 8 on the second floating platform 6 is used to perform a primary boost on the direct current converted by the horizontal-axis wind power generation device 7, thereby reducing the current and reducing the electric energy loss on the first transmission line 12 and the second transmission line 13.

[0034] To further improve the economic efficiency of the offshore wind turbine 100, the offshore wind turbine 100 of the first embodiment of the present invention further includes a third floating platform 9, a third transmission line 14, and a second substation 10 located on the third floating platform 9. The third floating platform 9 is spaced apart from the first floating platform 1 and the second floating platform 6, respectively. The second substation 10 is electrically connected to each of the first substations 8 via the third transmission line 14. The DC current, which has undergone primary boosting, is transmitted via the third transmission line 14 to the second substation 10. The second substation 10 converts the DC current into AC current, performs a secondary boost, and finally transmits the current to the onshore power grid via the first transmission line 12. This further reduces energy loss during transmission. Furthermore, the mature application of AC boosting and stepping down technology and the comprehensive equipment make AC current distribution more convenient and economical.

[0035] Specifically, the third transmission line 14 includes a first cable 141 and a second cable 142. The second substation 10 is electrically connected to each of the first substations 8 through the first cable 141. The first cable 141 extends towards the seabed at the first substation 8 and also extends towards the seabed at the second substation 10, such that at least a part of the connected first cable 141 is in seawater and has a certain distance from the sea level, thereby avoiding affecting the normal passage of marine vessels. The second substation 10 is electrically connected to the first transmission line 12 or the second transmission line 13 hung on the support frame 3 through the second cable 142, so as to transmit alternating current to the first transmission line 12 or the second transmission line 13. The second cable 142 extends upward from the top of the second substation 10 and connects to the second transmission line 13 or the first transmission line 12 to avoid affecting the normal passage of marine vessels.

[0036] Further, as Figures 1-3 shown, the structures of the first floating platform 1, the second floating platform 6, and the third floating platform 9 are the same, and each includes a main body 91, a mooring cable 92, and an anchor 93. The anchor 93 is used to anchor the seabed 5. The two ends of the mooring cable 92 are respectively connected to the main body 91 and the anchor 93 for positioning the main body 91. Specifically, a rotating shaft 21 is rotatably connected to the main body 91 of the first floating platform 1. A cable 4 and the first substation 8 are further arranged on the main body 91 of the first floating platform 1. A horizontal axis wind power generation device 7 and the first substation 8 are arranged on the main body 91 of the second floating platform 6. The second substation 10 is arranged on the main body 91 of the third floating platform 9.

[0037] Further, the support frame 3 includes an upper cross arm 31, a lower cross arm 32, and a sleeve 33 connecting the upper cross arm 31 and the lower cross arm 32. The upper cross arm 31 and the lower cross arm 32 are arranged up and down. The sleeve 33 is rotatably connected to the rotating shaft 21. The first transmission line 12 and the second transmission line 13 are hung on the upper cross arm 31 or the lower cross arm 32. The lower cross arm 32 is further connected to the cable 4, thereby fixing the support frame 3 relative to the main body 91. Further, in order to reduce the rotational friction between the rotating shaft 21 and the sleeve 33 and improve the wind energy utilization rate, a bearing is provided in the sleeve 33, and the sleeve 33 is rotatably connected to the rotating shaft 21 through the bearing.

[0038] Further, insulator strings 11 for hanging the first transmission line 12 and the second transmission line 13 are respectively provided on the upper cross arm 31 and the lower cross arm 32.

[0039] As Figure 4As shown in the figure, the present invention also has a second embodiment. The difference between the second embodiment and the first embodiment is that the second substation 10 of the second embodiment is only electrically connected to the first substation 8 on the first floating platform 1. The second substation 10 is only used to convert the direct current obtained by the vertical-axis wind power generation device 2 into alternating current and perform secondary voltage boosting. The direct current converted by the horizontal-axis wind power generation device 7 is directly boosted once by the first substation 8 on the second floating platform 6 and then incorporated into the first transmission line 12 through the second transmission line 13, thereby simplifying the structure, reducing the setting of the third floating platform 9 and the second substation 10, and saving costs.

[0040] The working process of the first embodiment of the present invention is as follows: When the sea breeze blows the blades 23 of the vertical-axis wind power generation device 2, the blades 23 drive the rotating shaft 21 to rotate. The rotating shaft 21 transmits mechanical energy to the generator 22, and the generator 22 converts mechanical energy into electrical energy and outputs direct current. The first substation 8 on the first floating platform 1 boosts the direct current converted by the generator 22 once. The direct current after one-time voltage boosting is transmitted to the second substation 10 through the first cable 141. The second substation 10 converts the direct current after one-time voltage boosting into an alternating current circuit and performs secondary voltage boosting. The alternating current circuit is finally transmitted to the first transmission line 12 through the second cable 142, and the first transmission line 12 transmits the alternating current to the land power grid.

[0041] When the sea breeze blows the blades of the horizontal-axis wind power generation device 7, the horizontal-axis wind power generation device 7 converts wind energy into electrical energy and outputs direct current. The first substation 8 on the second floating platform 6 boosts the direct current converted by the horizontal-axis wind power generation device 7 once. The direct current after one-time voltage boosting is transmitted to the second substation 10 through the first cable 141. The second substation 10 converts the direct current after one-time voltage boosting into an alternating current circuit and performs secondary voltage boosting. The alternating current is transmitted to the second transmission line 13 through the second cable 142, and then the second transmission line 13 incorporates the alternating current into the first transmission line 12, and enables the electrical energy obtained by the horizontal-axis wind power generation device 7 and the electrical energy obtained by the vertical-axis wind power generation device 2 to be uniformly transmitted to the land power grid.

[0042] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present invention.

Claims

1. A floating offshore wind power device, characterized in that, It includes a first floating platform, a vertical-axis wind power generation device, a support frame, a cable, and a first power transmission line; The vertical-axis wind power generation device includes a rotating shaft, a generator, and wind blades. The generator and each of the wind blades are connected to the rotating shaft. The rotating shaft is vertically arranged, the bottom end of the rotating shaft is rotatably connected to the first floating platform, the top end of the rotating shaft is rotatably connected to the support frame, and both ends of the cable are respectively connected to the first floating platform and the support frame. The first power transmission line is electrically connected to the generator and is hung on the support frame.

2. The floating offshore wind power device according to claim 1, wherein It further includes a second floating platform, a second power transmission line, and a horizontal-axis wind power generation device provided on the second floating platform. The second floating platform is arranged at an interval from the first floating platform. The second power transmission line is electrically connected to the horizontal-axis wind power generation device, is hung on the support frame, and is electrically connected to the first power transmission line.

3. The floating offshore wind power device according to claim 2, wherein First substations are respectively provided on the first floating platform and the second floating platform. The first substation on the first floating platform is electrically connected to the generator, and the first substation on the second floating platform is electrically connected to the horizontal-axis wind power generation device.

4. The floating offshore wind power device according to claim 3, characterized in that, It further includes a third floating platform, a third power transmission line, and a second substation provided on the third floating platform. The third floating platform is respectively arranged at intervals from the first floating platform and the second floating platform. The second substation is electrically connected to each of the first substations through the third power transmission line.

5. The floating offshore wind power device according to claim 4, wherein, The third power transmission line includes a first cable and a second cable. The second substation and each of the first substations are electrically connected through the first cable. The first cable extends towards the seabed at the first substation and also extends towards the seabed at the second substation, so that at least a part of the connected first cable is in seawater and has a certain distance from the sea level. The second substation is electrically connected to the first power transmission line or the second power transmission line through the second cable. The second cable extends upward from the top of the second substation and is connected to the second power transmission line or the first power transmission line.

6. The floating offshore wind power device according to claim 4, wherein, The first floating platform, the second floating platform, and the third floating platform have the same structure, and each includes a main body, a mooring cable, and an anchor. The anchor is used for anchoring the seabed, and both ends of the mooring cable are respectively connected to the main body and the anchor. The rotating shaft is rotatably connected to the main body of the first floating platform. The cable and the first substation are further arranged on the main body of the first floating platform. The horizontal-axis wind power generation device and the first substation are arranged on the main body of the second floating platform. The second substation is arranged on the main body of the third floating platform.

7. The floating offshore wind power device according to claim 6, wherein, The support frame includes an upper cross arm, a lower cross arm, and a sleeve connecting the upper cross arm and the lower cross arm. The upper cross arm and the lower cross arm are arranged up and down. The sleeve is rotatably connected to the rotating shaft. The first power transmission line and the second power transmission line are hung on the upper cross arm or the lower cross arm. The lower cross arm is further connected to the cable.

8. The floating offshore wind power device according to claim 7, characterized in that, The upper cross arm and the lower cross arm are also respectively provided with insulator strings for hanging the first transmission line and the second transmission line.

9. The floating offshore wind power device according to claim 7, wherein A bearing is arranged in the sleeve, and the sleeve is rotationally connected to the rotating shaft through the bearing.

10. The floating offshore wind power device according to claim 1, wherein, The cross section of the wind blade in the vertical direction is arc-shaped, and two ends of the wind blade are respectively connected to the top end and the bottom end of the rotating shaft.

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