Offshore composite power generation device, system and its wave power generation unit

Abstract

This invention relates to a marine composite power generation device, system, and wave power generation unit for providing power generation on the ocean, in order to solve the problems of existing marine power generation devices failing to fully utilize marine energy such as sunlight, sea breeze, and waves, as well as the problem of interference from coastal defense vessels. The invention consists of a base for a wave power generation unit to provide a battery unit for installation, and two uprights above the wave power generation unit to provide a solar power generation unit and a wind power generation unit for installation, thus forming the marine composite power generation device of this invention. Several marine composite power generation devices are connected in series and parallel by cables, and then electrically connected to an inverter to facilitate power output, thereby forming the marine composite power generation system of this invention that combines power generation and coastal defense.

Description

Technical Field

[0001] This invention relates to the technical field of green energy, and more particularly to the technical scope of an offshore composite power generation device, system and its wave power generation unit. Prior Technology

[0002] Note that as climate warming and energy shortages become increasingly severe, countries around the world are vigorously developing renewable energy, and ocean energy is an important form of green energy, mainly including wave energy, tidal energy, offshore wind energy, ocean current energy, etc. Among them, offshore wind energy, wave energy, and offshore solar energy are all abundant and do not occupy land resources, so ocean energy has the greatest development potential and research value.

[0003] The principle used in wave power generation devices is to convert wave motion (i.e., a combination of vertical and horizontal motion) into usable mechanical and electrical energy. That is, the wave drives the movement of floats, pistons or other structural components in the system, and this movement will link the mechanical or hydraulic system in the system, thereby driving the generator to generate electricity, such as the "Wave Energy Power Generation Device" of Taiwan Invention Patent No. I857721B.

[0004] However, most existing marine power generation devices are single power generation systems, such as the aforementioned wave power generation systems, tidal power generation systems, or ocean current power generation systems. These systems cannot fully convert natural energy sources such as sunlight, sea breeze, and / or ocean waves into electricity. Alternatively, they are large-scale power generation systems, making maintenance difficult. For example, offshore wind power has extremely large components and is located too far from the shore, resulting in high maintenance costs. In addition, most existing marine power generation devices lack coastal defense capabilities. Therefore, it is necessary to improve existing marine power generation equipment. Summary of the Invention

[0005] Therefore, in view of the problems existing in existing offshore power generation devices, the inventors have devoted themselves to developing the present invention, which is an offshore composite power generation device, system and wave power generation unit. Thus, the main objective of the present invention is to provide a wave power generation unit that fully converts the natural energy stored in ocean waves into electricity; the secondary objective of the present invention is to provide a composite power generation device that fully converts natural energy such as sunlight, sea breeze and ocean waves into electricity; a further objective of the present invention is to provide an easy-to-maintain offshore composite power generation system; and another objective of the present invention is to provide an offshore composite power generation system for coastal and coastal defense protection.

[0006] To achieve the above objectives, the present invention relates to a wave power generation unit using the following technical means, comprising: a float, which is an outer shell with an internal space, and two placement spaces are provided at the center of the two ends of the internal space, while a cable connector is provided at the center of the two outer ends of the outer shell to facilitate power output; a stator, which is surrounded by several coils and fixed to the inner surface of the outer shell; a rotor, which has a central hollow hole and is penetrated and connected by a central inner rod, and several permanent magnets and a counterweight are provided around the outer periphery and an inner edge of the rotor, and the rotor is located inside the stator; the rotor rotates relative to the stator by means of relative rotation using a one-way bearing; and a base, which is connected to the bottom of the float and provides a battery unit for mounting.

[0007] One-way bearings are provided between the two ends of the central inner rod of the rotor and the two placement spaces.

[0008] A cross rib is connected between each end of the central hollow hole of the rotor and the central inner rod.

[0009] The aforementioned buoy is designed to lie horizontally, and two external battery packs are provided on the outer sides of the base. The two external battery packs are connected in parallel or in series with the battery unit provided on the base, and the inside is filled with nitrogen or helium. In addition, several floats are provided inside the base.

[0010] This invention relates to an offshore composite power generation device, which uses the aforementioned wave power generation unit and further comprises: two masts, which are attached to the top of the buoy and are positioned opposite each other and spaced apart, with a fault warning light at the top of each of the two masts; a solar power generation unit, which is installed and pivotally connected between the two masts to form two pivot joints, with a sun-tracking unit connected to each of the two pivot joints; and a control unit, which is located at any of the buoy, the base, or the two masts, and the control unit is electrically connected to the fault warning light, the wave power generation unit, the solar power generation unit, the sun-tracking unit, and the battery unit.

[0011] The aforementioned solar power generation unit further includes a Z-shaped flat plate fan blade, and two rotating shafts extend from the middle of the two sides of the Z-shaped flat plate fan blade and are fitted into the two pivot joints provided on the two uprights. The two rotating shafts are respectively connected to a first bevel gear to connect the sun-chasing unit and a wind power generation unit. In addition, a solar panel is provided on the front and back of the Z-shaped flat plate fan blade.

[0012] The aforementioned sun-tracking unit further includes a sun-tracking detection module, a drive motor module, and a second bevel gear. The sun-tracking detection module and the drive motor module are electrically connected to the control unit, and the drive motor module is connected to the second bevel gear. The second bevel gear then meshes with the first bevel gear provided in the solar power generation unit.

[0013] The two poles are provided for mounting the wind power generation unit, and the wind power generation unit further includes a wind turbine and a third bevel gear that are interconnected, and the third bevel gear meshes with the first bevel gear provided in the solar power generation unit.

[0014] The aforementioned control unit is electrically connected to the wind power generation unit; and at least one pressure relief valve is provided on the buoy or the two masts.

[0015] The present invention relates to an offshore composite power generation system using the aforementioned offshore composite power generation device, which comprises: several offshore composite power generation devices connected in series, in parallel, or in a series-parallel connection via several cables; and an inverter electrically connected to the several offshore composite power generation devices connected in series, in parallel, or in a series-parallel connection to facilitate power output.

[0016] By employing the aforementioned technical means, the present invention can achieve the following effects:

[0017] 1. The wave power generation unit of the present invention is equipped with a rotor, a weight, and all means for unidirectional rotation. When the wave power generation unit is hit by a wave, the rotor and the weight can rotate slightly through the unidirectional rotation means. In addition to generating a small amount of electrical energy, the remaining energy generated by the wave impact is temporarily stored in the form of gravitational potential energy. When the rotor and the weight accumulate more than half a revolution of gravitational potential energy, the rotor and the weight can rotate more due to free fall, thereby generating more electrical energy. In this way, by having several waves of different sizes repeatedly hit the wave power generation unit day and night, more electrical energy can be fully obtained for output.

[0018] 2. In addition to wave power generation, the present invention can also be combined with a solar power generation unit and / or a wind power generation unit to fully utilize the natural energy of sunlight, sea breeze and / or waves at sea; in particular, when the solar power generation unit of the present invention uses solar panels on both sides, the sun-tracking unit ensures that when one side is directly exposed to sunlight, the other side is directly exposed to sunlight reflected from the sea surface, thus enabling full solar power generation, and solar power generation at sea does not occupy land resources; the wind power generation unit utilizes the Z-shaped flat blades to fully generate wind power by means of sea breeze.

[0019] 3. This invention relates to a marine composite power generation system comprising multiple marine composite power generation devices connected in series, parallel, or series-parallel. Each marine composite power generation device has a control unit with a self-detection function. If a marine composite power generation device malfunctions, the control unit will activate a fault warning light and simultaneously send a wired or wireless fault notification signal to facilitate system maintenance. Furthermore, the components constituting the wave power generation unit of this invention can be recycled and reused, conforming to green energy and a green economy. Moreover, if a wave power generation unit of this invention is damaged, it can be individually recycled and repaired without affecting the overall operation of the system.

[0020] 4. The marine composite power generation system of the present invention can be arranged adjacent to the seawall or coastline to facilitate domestic coastal defense and at the same time generate electricity. If a vessel intrudes, disturbs or damages the system equipment of the present invention, the maintenance unit and the defense unit can be notified immediately. Simple Explanation of the Diagram

[0021] [Figure 1] is a schematic diagram of an embodiment of the present invention regarding its offshore composite power generation device. [Figure 2] is a perspective view of the marine composite power generation device of the present invention. [Figure 3] is a front view of the present invention regarding its offshore composite power generation device. [Figure 4] is a cross-sectional view of the marine composite power generation device of the present invention. [Figure 5] is a longitudinal cross-sectional view of the base and wave power generation unit of the present invention. [Figure 6] is a full cross-sectional view of the one-way bearing used in this invention. [Figure 7] is a schematic diagram of the power generation operation of the wave power generation unit of the present invention. [Figure 8] is a bottom view of the present invention regarding its offshore composite power generation device. [Figure 9] is a schematic diagram of the present invention regarding the addition of two external battery packs to its offshore composite power generation device. [Figure 10] is a block diagram of the electrical control of the marine composite power generation device of the present invention. [Figure 11] is an electrical control block diagram of the sun-tracking unit of the device of the present invention. [Figure 12] is a schematic diagram of the architecture of the marine composite power generation system of the present invention. [Figure 13] is a schematic diagram of the implementation of the present invention’s offshore composite power generation system on the domestic coast. Implementation

[0022] This invention relates to a marine composite power generation device, system, and its wave power generation unit, as shown in Figures 1 and 10. It can provide marine solar power generation, wind power generation, and / or wave power generation, thereby fully converting marine natural energy sources such as solar energy (E), wind energy (F), and wave energy (G) into electrical energy. Simultaneously, it is easy to maintain and has coastal defense functions to prevent malicious intrusion or harassment by vessels from the opposite shore. The wave power generation unit A comprises: a float 1, a stator 2, a rotor 3, and a base 4. The above components are described below with reference to the figures.

[0023] As shown in Figures 2 to 5, the float 1 is an outer shell 11 with an inner space 12. Two placement spaces 13 are provided at the center of the two ends of the inner space 12, and a cable connector 14 is provided at the center of the two outer ends of the outer shell 11 to facilitate the output of electricity or the interconnection of several wave power generation units A. In addition, the inner space 12 of the float 1 can be filled with inert gases such as nitrogen or helium to enhance the buoyancy of the float 1.

[0024] The stator 2 is equipped with several coils 21 and is fixed to the inner surface 111 of the outer casing 11.

[0025] The rotor 3 has a central hollow hole 31 and is penetrated and connected by a central inner rod 32. A cross rib 35 is respectively connected between the two ends of the central hollow hole 31 and the central inner rod 32. Several permanent magnets 33 and a counterweight 34 are respectively provided around the outer periphery and one inner edge of the rotor 3. The rotor 3 is located inside the stator 2. The rotor 3 rotates relative to the stator 2 by means of relative rotation using one-way bearings 15, as shown in Figures 5 and 6. One-way bearings 15 are provided between the two ends of the central inner rod 32 and the two placement spaces 13.

[0026] Furthermore, the one-way bearing 15 system further includes an outer ring 151 and an inner ring 152. The outer ring 151 is provided to be fitted and fixed inside the placement space 13 provided in the float 1, while the inner ring 152 is provided to be fitted and fixed to one end of the central inner rod 32 provided in the rotor 3. In addition, several oblique grooves 153 are evenly distributed along the inner edge 1511 of the outer ring 151 towards the inner ring 152. The oblique grooves 153 are respectively placed into a steel ball 154 and a spring 155. The bottom of each steel ball 154 is pushed by each spring 155, so that the top of each steel ball 154 pushes against the outer edge 1521 of the inner ring 152. Thus, the inner ring 152 can only rotate in one direction relative to the outer ring 151, that is, the rotor 3 can only rotate in one direction relative to the stator 2 and cannot reverse. It should be noted that the more sets of steel balls 154 are arranged in the one-way bearing 15, the more the wave power generation unit A can absorb the energy of smaller waves without losing the energy of small waves.

[0027] As shown in Figures 5, 8, and 9, the base 4 is attached to the bottom of the pontoon 1 and provides a battery unit 41 for installation. The battery unit 41 contains several batteries or lithium batteries to store electrical energy. At the same time, two external battery packs 16 are provided on the outer sides of the base 4, as shown in Figure 9. They are connected in parallel or in series with the connectors on both sides of the battery unit 41 to form a single integrated power generation system. The battery pack configuration provides the function of storing electricity at sea and generating electricity on land. In addition, several floats 42 are provided in the base 4, which can improve the balance and buoyancy of the pontoon 1 on the waves.

[0028] Therefore, the wave power generation unit A of the present invention provides a preferred solution for wave power generation. When placed on the sea surface, about 1 / 3 to 1 / 2 of it will sink into the sea, while the remaining 2 / 3 will be exposed above the sea surface. The wave power generation unit A mainly has the weight 34 inside the rotor 3, and the battery unit 41 inside the base 4 at the bottom of the outer shell 11 acts as a large weight. When the waves repeatedly hit the outside of the float 1, the appearance of the float 1 often tilts. Although the stator 2 will tilt with the outer shell 11, the rotor 3 and the weight 34 inside the rotor 3 still remain in a vertical state. Due to the action of the two one-way bearings 15, when the float 1 returns to its original non-tilted state, the rotor 3 is rotated by a specific angle, which is equivalent to raising the weight 34.

[0029] In other words, when the float 1 sways up and down and left and right due to the waves, the one-way bearings 15 installed at both ends of the central inner rod 32 of the rotor 3 can only rotate in one direction. As shown in Figure 7, the rotor 3 will not only rotate slightly relative to the stator 2, but also the height (i.e., gravitational potential energy) of the hammer 34 located on the rotor 3 will gradually be raised by the energy of the waves. When the hammer 34 reaches a direction greater than 12 o'clock (i.e., more than 180 degrees), the hammer 34 will fall freely due to its gravity in the direction of rotation, causing the permanent magnet 33 on the rotor 3 to rotate and interact with the coil 21 of the stator 2, thereby generating electricity. Therefore, as long as the waves repeatedly hit the outside of the wave power generation unit A, the rotor 3 will rotate repeatedly to generate electricity. During peak ionization periods, the wave power generation unit A can pre-store the generated electrical energy in the battery unit 41 located inside the base 4, and then output the generated power directly to the outside through the cable extending through the outer casing 11.

[0030] Regarding the marine composite power generation device B of the present invention, as shown in Figures 2, 9 to 11, two uprights 5 are provided on the top of the float 1 of the aforementioned wave power generation unit A, and the two uprights 5 are opposite each other and spaced apart. A fault warning light 51 is provided at the top of each of the two uprights 5. A solar power generation unit 6 is provided, which is pivotally connected to two pivot points 52 between the two uprights 5 on both sides. A sun-tracking unit 7 is provided at the two pivot points 52. A control unit 8 is provided at any of the float 1, the base 4 or the two uprights 5, and the control unit 8 is electrically connected to the fault warning light 51, the wave power generation unit A, the solar power generation unit 6, the sun-tracking unit 7 and the battery unit 41, etc.

[0031] Please further refer to Figures 3 and 4. The solar power generation unit 6 further includes a Z-shaped flat blade 61, and two rotating shafts 62 extend from the middle of the two sides of the Z-shaped flat blade 61 and fit into the two pivot joints of the two uprights 5. The two rotating shafts 62 are respectively connected to a first bevel gear 63, and then to a second bevel gear 73 of the sun-tracking unit 7 and a third bevel gear 92 of the wind power generation unit 9. In addition, a solar panel 64 is provided on both the front and back of the Z-shaped flat blade 61. The sun-tracking unit 7 further includes a sun-tracking detection module 71, a drive motor module 72 and the second bevel gear 73. The sun-tracking detection module 71 and the drive motor module 72 are electrically connected to the control unit 8, and the drive motor module 72 is connected to the second bevel gear 73. The second bevel gear 73 then meshes with the first bevel gear 63 of the solar power generation unit 6. Therefore, the sun-tracking unit 7 can drive the Z-shaped flat plate fan blade 61 to rotate appropriately according to the movement of the sun's rays during the day, so that the sunlight and the sunlight reflected from the sea can directly hit the two solar panels 64, so as to fully generate solar power.

[0032] Meanwhile, the two uprights 5 provide a mounting point for the wind power generation unit 9, which further includes a wind turbine 91 and a third bevel gear 92 connected to each other. The third bevel gear 92 then meshes with the first bevel gear 63 of the solar power generation unit 6, and the wind power generation unit 9 is electrically connected to the control unit 8. In this way, the sea breeze blows on the Z-shaped flat blade 61, causing it to rotate, and then the wind turbine 91 is driven by the transmission of the first bevel gear 63 and the third bevel gear 92 to generate wind power. In addition, at least one pressure relief valve 17 is provided on the float 1 or the two uprights 5. When the internal air pressure of the float 1 reaches a preset value, it will be depressurized to prevent the internal air pressure of the float 1 or the two uprights 5 from becoming too high due to the thermal expansion of the air during power generation.

[0033] Therefore, the marine composite power generation device B of the present invention provides a preferred solution for composite power generation from marine sunlight, sea breeze and / or sea waves. Specifically, the marine composite power generation device B mainly combines the sea wave power generation unit A with the solar power generation unit 6 and / or the wind power generation unit 9. In other words, the marine composite power generation device B, in addition to having sea wave power generation capabilities, also has solar power generation and / or wind power generation capabilities, to fully utilize the natural marine energy sources of sunlight, sea breeze and / or sea waves; particularly the solar power generation... When Unit 6 uses the solar panels 64 on both the front and back sides, the sun-tracking unit 7 ensures that while one side is directly exposed to sunlight, the other side is directly exposed to sunlight reflected from the sea surface, thus maximizing solar power generation. The wind power generation unit 9 utilizes the Z-shaped flat blades 61, which are rotated by the sea breeze, thereby driving the first bevel gear 63 and the third bevel gear 92. The third bevel gear 92 then drives the wind turbine 91 to maximize wind power generation.

[0034] It should be noted that the control unit 8 of the offshore composite power generation device B has a self-detection function. If the offshore composite power generation device B malfunctions, the control unit 8 will turn on the fault warning light 51 and simultaneously send a wired or wireless fault notification signal to the maintenance unit to facilitate the maintenance of the device system equipment of the present invention.

[0035] As shown in Figure 12, the marine composite power generation system C of the present invention involves connecting several marine composite power generation devices B in series, parallel, or series-parallel via several cables 141. An inverter D is then electrically connected to these connected devices B to facilitate power output. Therefore, the marine composite power generation system C of the present invention provides a superior solution that combines marine composite power generation and coastal defense. Specifically, while the marine composite power generation system C can fully convert natural marine energy sources such as sunlight, wind, and / or waves into electrical energy, during peak daytime electricity consumption periods, the inverter D converts DC to AC to directly supply mains power. During off-peak nighttime electricity consumption periods, the generated electrical energy can be stored in the battery unit 41 located inside the base 4.

[0036] On the other hand, the marine composite power generation system C of the present invention can be arranged adjacent to the seawall or coast, as shown in Figure 13, to facilitate domestic coastal defense and at the same time provide power generation functions. If a vessel intrudes and damages the marine composite power generation system C of the present invention, the damaged marine composite power generation device B can be used as a detector for coastal intrusion. That is, the damaged marine composite power generation device B will light up the fault warning light 51 and simultaneously send a wired or wireless fault notification signal, so that maintenance units and defense units can be immediately notified that the coast has been invaded.

[0037] In summary, this invention relates to an offshore composite power generation device, system, and its wave power generation unit, and has the following features:

[0038] 1. When there are only waves at sea: The wave power generation unit has a small weight device inside, while the external battery device acts as a large weight device. When the waves hit, the unit tilts in appearance, but the small weight inside remains vertical. When it sways up and down and left and right, the bearing system on the permanent magnet rotor is designed to rotate only in one direction. When the small weight comes to a position greater than 12 o'clock, it will fall and rotate in the direction of rotation. The permanent magnet on the rotor rotates and excites the stator coil to generate electricity. Therefore, as long as there are waves, it will rotate and generate electricity in a continuous cycle.

[0039] 2. When there is only wind at sea: The wave power generation unit will still generate electricity as described in item 1 above. At the same time, the wave power generation unit is equipped with Z-shaped flat blades that rotate in the wind and are connected to wind turbines on both sides to generate electricity.

[0040] 3. When there is only sunlight at sea: The Z-shaped flat plate fan blades on both sides of the wave power generation unit are solar panels, which will generate electricity as long as there is sunlight; in addition, the wave power generation unit is equipped with a sun-tracking detection device that uses a controller to drive the motor to adjust the angle of the solar panels being irradiated by the direction of sunlight.

[0041] 4. When there are both wind and waves at sea: When waves come, the action in step 1 above will be performed. When the wind comes, the Z-type flat plate fan blades will be controlled by the controller to be perpendicular to the sea surface, which will also make the wave power generation unit tilt. At this time, the controller will adjust the fan blades to be horizontal, which will increase the frequency of the wave swaying and increase the power generation. The Z-type flat plate fan blades will rotate faster due to the wind, and the wind power generation unit will also rotate and increase the power.

[0042] 5. At sea, there is wind, waves, and sunshine at the same time: According to the action in item 4 above, when the Z-shaped flat plate blades rotate, the solar panels on both sides will not be weakened by the angle of illumination. On the contrary, the solar panels under the Z-shaped flat plate blades, which are parallel to the sea surface when the sunlight shines on the sea surface, will also be illuminated, increasing power generation.

[0043] Furthermore, none of the aforementioned constituent units, devices, and systems have been seen in books or publicly used, thus meeting the requirements for an invention patent application. We earnestly request your esteemed authority to consider this matter and grant the patent as soon as possible. We are deeply grateful for your consideration.

[0044] It should be noted that the above description is the technical principle used in the specific embodiments of this case. If any changes are made in accordance with the concept of this case, and the resulting functions and effects do not exceed the spirit covered by this specification and drawings, they should be stated within the scope of the patent application of this case.

[0045] A: Wave power generation unit B: Offshore composite power generation unit C: Offshore Composite Power Generation System 1: pontoon 11: Outer shell 111: Inner surface 12: Interior Space 13: Placement space 14: Cable Connector 141: Cable 15: One-way bearing 151: Outer Ring Road 1511: Inner edge 152: Inner Ring 1521: Outer edge 153: Inclined groove 154: Steel Balls 155: Spring 16: External battery pack 17: Pressure relief valve 2: Stator 21: Coil 3: Rotor 31: Central hollow hole 32: Center Inner Rod 33: Permanent magnet 34: Heavy Hammer 35: Cross-ribbed body 4: Base 41: Battery Unit 42: Floating Vessel 5: Erecting poles 51: Fault Warning Light 52: Pivot 6: Solar power generation unit 61: Z-type flat fan blade 62: Shaft 63: First bevel gear 64: Solar panels 7: Chasing the Sun Unit 71: Sun-chasing detection module 72: Drive motor module 73: Second bevel gear 731: Bevel gear set 8: Control Unit 9: Wind power generation unit 91: Wind turbine 92: Third bevel gear D: Inverter E: Marine solar energy F: Offshore wind energy G: Marine Wave Energy

Claims

1. A wave power generation unit, comprising: a float, which is an outer shell with an internal space, and two placement spaces are provided at the center of each of the two ends of the internal space, and a cable connector is provided at the center of each of the two outer ends of the outer shell for power output; a stator, which is provided with a plurality of coils and fixed to the inner surface of the outer shell; a rotor, which has a central hollow hole and is penetrated and connected by a central inner rod, and a plurality of permanent magnets and a counterweight are provided on the outer periphery and an inner edge of the rotor, and the rotor is located inside the stator; the rotor rotates relative to the stator by means of relative rotation using a one-way bearing; and a base, which is connected to the bottom of the float and provides for mounting a battery unit.

2. The wave power generation unit as described in claim 1, wherein the one-way bearing is provided between each end of the central inner rod of the rotor and the two placement spaces.

3. The wave power generation unit as described in claim 1, wherein a cross rib is respectively connected between the two ends of the central hollow hole of the rotor and the central inner rod.

4. The wave power generation unit as described in claim 1, wherein the float is laid horizontally and two external battery packs are provided on the outside of both sides of the base, and the two external battery packs are connected in parallel or in series with the battery unit provided on the base, and the inside of the battery unit is filled with nitrogen or helium; in addition, several floats are provided in the base.

5. A marine composite power generation device comprising: a wave power generation unit as described in any one of claims 1-4; two masts attached to the top of the buoy and positioned opposite each other and spaced apart, with a fault warning light at the top of each mast; a solar power generation unit mounted and pivotally connected between the two masts, forming two pivot joints, with a sun-tracking unit connected to each pivot joint; and a control unit disposed at any of the buoy, the base, or the two masts, and electrically connected to the fault warning light, the wave power generation unit, the solar power generation unit, the sun-tracking unit, and the battery unit.

6. The offshore composite power generation device as described in claim 5, wherein the solar power generation unit further includes a Z-shaped flat plate fan blade, and two rotating shafts extend from the middle of the two sides of the Z-shaped flat plate fan blade and are fitted into the two pivot joints provided on the two uprights, and the two rotating shafts are respectively connected to a first bevel gear to connect the sun-tracking unit and a wind power generation unit; in addition, a solar panel is provided on the front and back of the Z-shaped flat plate fan blade.

7. The marine composite power generation device as described in claim 6, wherein the sun-tracking unit further includes a sun-tracking detection module, a drive motor module and a second bevel gear, wherein the sun-tracking detection module and the drive motor module are electrically connected to the control unit, and the drive motor module is connected to the second bevel gear, and the second bevel gear meshes with the first bevel gear provided in the solar power generation unit.

8. The offshore composite power generation device as claimed in claim 7, wherein the two poles are provided for mounting the wind power generation unit, and the wind power generation unit further includes a wind turbine and a third bevel gear connected to each other, and the third bevel gear meshes with the first bevel gear provided in the solar power generation unit.

9. The offshore composite power generation device as claimed in claim 8, wherein the control unit is electrically connected to the wind power generation unit; and at least one pressure relief valve is provided on the buoy or the two masts.

10. An offshore composite power generation system comprising: a plurality of offshore composite power generation devices as described in any one of claims 5-9, wherein the plurality of offshore composite power generation devices are connected in series, in parallel, or in a series-parallel connection via a plurality of cables; and an inverter electrically connected to the plurality of offshore composite power generation devices connected in series, in parallel, or in a series-parallel connection to facilitate power output.

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