A floating wave and wind energy integrated power generation system

Abstract

The application discloses a floating wave energy and wind energy integrated power generation system, which comprises a floating wind power generation device and a wave energy power generation device sharing a semi-submersible platform, the semi-submersible platform can be used as a floating foundation of the floating wind power generation device and a float of the wave energy power generation device; the semi-submersible platform comprises a central column and three main floats, the main floats are distributed at three vertices of an equilateral triangle and are arranged at an angle of 60 degrees with each other, the central column is arranged at a central position of the equilateral triangle, and the central column and the main floats are connected through cross struts and inclined struts; the floating wind power generation device comprises a wind driven generator, a tower drum and the semi-submersible platform, the wind driven generator is installed at a top end of the tower drum, and a bottom end of the tower drum is fixed on the central column of the semi-submersible platform.

Description

Technical fields:

[0001] This invention relates to a floating wave energy-wind energy integrated power generation system. Background technology:

[0002] Faced with the increasingly severe energy crisis and environmental problems, developing and utilizing renewable energy to gradually replace traditional fossil fuels and meet the growing energy demand has become a general consensus. At present, the development of renewable energy, represented by wind power and hydropower, is mostly concentrated on the mainland. Due to limitations such as reserves and space, the development of land-based renewable energy is approaching saturation and is gradually shifting to the ocean.

[0003] The reserves of wind and wave energy in marine renewable energy are enormous, and their distribution is closely correlated. Areas rich in wind energy resources also have considerable wave energy reserves. With the advancement of deep-sea energy development, floating wind turbines have shown better economic efficiency than fixed wind turbines, and the feasibility of floating wave energy power generation technology has also been recognized by the industry.

[0004] Because existing floating wind turbines and floating wave power generation devices are all deployed separately, they suffer from high mooring and transmission costs and short effective power generation duration. This results in a low energy availability rate for single-energy-source development in deep-sea ocean energy, which restricts the in-depth development of marine renewable energy. Furthermore, directly integrating wave power generation devices into existing floating wind power platforms would affect the performance of the floating wind power platforms and cause serious energy losses. Summary of the Invention:

[0005] This invention provides a floating wave-wind energy integrated power generation system with a reasonable structural design that integrates floating wind power generation devices and wave power generation devices in an orderly manner. It can adjust the platform center, improve the fixed tilt angle of the offshore platform caused by the aerodynamic forces of the wind turbine, improve the power generation efficiency of the wind power generation devices and wave power generation devices, and further adjust the PTO system damping of the wave power generation device to suppress the pitch of the floating platform, improve the platform's seakeeping, reduce fatigue damage, and reduce structural load. At the same time, it shares mooring systems, power infrastructure, and other components of the wind farm to reduce the overall project cost. The generation of wave energy can compensate for the intermittency of offshore wind power, and through wind-wave complementarity, it can deeply develop marine renewable resources, solving the problems existing in the prior art.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0007] A floating wave energy-wind energy integrated power generation system, the integrated power generation system includes a floating wind energy power generation device and a wave energy power generation device sharing a semi-submersible platform, the semi-submersible platform can serve as both a floating foundation for the floating wind energy power generation device and a float for the wave energy power generation device;

[0008] The semi-submersible platform includes a central column and three main buoys. The main buoys are distributed at the three vertices of an equilateral triangle, forming a 60° angle with each other. The central column is located at the center of the equilateral triangle. The central column and the main buoys are connected by horizontal and diagonal braces.

[0009] The floating wind power generation device consists of a wind turbine, a tower, and a semi-submersible platform. The wind turbine is installed at the top of the tower, and the bottom of the tower is fixed to the central column of the semi-submersible platform.

[0010] The wave energy power generation device includes a semi-submersible platform, a PTO system, a hydraulic power generation system, and a heave plate. The semi-submersible platform and the heave plate are connected by a vertical guide pile and a hydraulic cylinder. The bottom end of the vertical guide pile is fixed to the heave plate by a flange. The vertical guide pile passes through the bottom of the main buoy and extends into the main buoy, ensuring that the semi-submersible platform can move vertically along the vertical guide pile. The hydraulic cylinder is installed between the main buoy of the semi-submersible platform and the heave plate. The relative movement of the semi-submersible platform and the heave plate drives the hydraulic rod to move, which in turn pushes the hydraulic oil in the hydraulic cylinder into the hydraulic power generation system through hydraulic pipelines, converting wave energy into hydraulic energy, and then driving the generator to generate electricity.

[0011] Limit blocks are installed on the upper part of the vertical guide pile to prevent the relative displacement between the semi-submersible platform and the heave plate from exceeding the stroke range of the hydraulic cylinder.

[0012] The interior of the heave plate is divided into a fixed ballast tank and an adjustable ballast tank. At the bottom of the heave plate, there is a guide hole for the mooring cable to improve the power generation efficiency of wave energy.

[0013] The hydraulic power generation system includes interconnected hydraulic cylinders, check valves, accumulators, ball valves, throttle valves, variable displacement hydraulic motors, generators, relief valves, oil tanks, and suction filters. Hydraulic oil is forced into the hydraulic lines through the relative motion of the semi-submersible platform and the heave plate. When the pressure in the hydraulic lines exceeds a predetermined pressure, some hydraulic oil flows into the accumulator to store energy. When the energy storage reaches the pressure of the relief valve, the relief valve opens, and excess hydraulic oil returns to the oil tank via the relief valve. When the pressure in the hydraulic lines falls below a predetermined pressure, hydraulic oil from the accumulator flows into the lines to replenish the pressure. The accumulator and relief valve stabilize the pressure in the hydraulic lines, and the throttle valve controls the speed of the hydraulic motor, enabling the generator to maintain high power generation efficiency.

[0014] The integrated power generation system also includes a ballast water regulation system, comprising a submersible pump, ballast water pipelines, a data acquisition system, pressure sensors, a controller, an attitude sensor, a battery, a wind speed sensor, and ballast tanks. The submersible pump is located in an adjustable ballast tank of the heave plate. The ballast water pipelines connect the adjustable ballast tanks in the three heave plates along vertical guide piles and cross braces. Pressure sensors are installed at the bottom of the adjustable ballast tanks to monitor the volume of ballast water in the adjustable ballast tanks.

[0015] The attitude sensor is installed at the bottom of the central column to measure the attitude of the integrated power generation system in real time. The data acquisition system and controller are located at the bottom of the central column. The data acquisition system collects meteorological data, attitude data of the integrated power generation system, and pressure data of the adjustable ballast tank. The controller is used to redistribute ballast water, issue control commands, control the opening and closing of submersible pumps and shut-off valves, complete the ballast water adjustment, and then adjust the mass of the adjustable ballast water in the three heave plates to counteract the fixed tilt angle of the semi-submersible platform caused by the average wind load, thereby improving the power generation effect of the floating wind power generation device and wave power generation device.

[0016] A method for adjusting the center of gravity of a floating wave energy-wind energy integrated power generation system includes the following steps:

[0017] S1: Obtain the average wind speed of the wind field near the wind and wave integrated system based on meteorological data or wind speed sensors, and use this as the initial input;

[0018] S2, calculate the wind load by the thrust curve of the wind turbine, and calculate the magnitude and direction of the wind load on the semi-submersible platform based on the windward area above the waterline of the semi-submersible platform.

[0019] S3, based on the calculated wind load, allocates the capacity of the three variable ballast chambers through moment balance;

[0020] S4, the controller starts the corresponding submersible pump and shut-off valve to adjust and balance the ballast water;

[0021] S5 determines the average pitch angle per hour to further adjust the ballast water.

[0022] A method for reducing sway using a floating wave-wind energy integrated power generation system includes the following steps:

[0023] S1, Sets the wave height range for PTO system anti-roll adjustment, H s To initiate the wave height, H f To terminate the wave height;

[0024] S2, real-time detection and acquisition of wave height H, pitch angle of integrated power generation system, vertical displacement of each main buoy, and displacement of hydraulic rods inside the main buoy;

[0025] S3, determine the relative relationship between the real-time detected wave height H and the wave height range; when H < H s At that time, the wave energy power generation device achieves maximum power by adjusting the throttle valve opening and the PTO system according to the optimal damping adjustment; when H s <H<H f When the heave displacement of the main buoy is in phase with the displacement of its internal hydraulic rod, the throttle valve is opened; otherwise, it is closed. When H > H f At this time, the hydraulic cylinder is moved downwards to the bottom to maximize the distance between the heave plate and the semi-submersible platform, and the throttle valve is closed.

[0026] This invention employs the aforementioned structure, using a semi-submersible platform as the floating foundation for a floating wind power generation device and a buoy for a wave power generation device, thereby systematically combining the two devices. It reduces overall project costs by sharing mooring systems, power infrastructure, and other components of the wind farm. Wave energy generation compensates for the intermittency of offshore wind power, enabling wind-wave complementarity for the deep development of marine renewable energy. Adjusting the PTO system introduces additional restoring torque and positive damping gauges, improving the platform's seakeeping and reducing fatigue damage. Ballast adjustment improves the platform's tilt angle caused by wind turbine aerodynamics, enhancing the power generation efficiency of both the wind turbine and wave power generation device. This invention offers advantages such as low cost, stability, and practicality. Attached image description:

[0027] Figure 1 This is a schematic diagram of the structure of the present invention.

[0028] Figure 2 This is a schematic diagram of the wave energy generation device of the present invention.

[0029] Figure 3 This is a schematic diagram of the hydraulic power generation system of the present invention.

[0030] Figure 4 This is a schematic diagram of the ballast water regulating system of the present invention.

[0031] Figure 5 This is a flowchart illustrating the center of gravity adjustment method of the present invention.

[0032] In the diagram, 1-Wind turbine, 2-Tower, 3-Semi-submersible platform, 4-Horizontal brace, 5-Central column, 6-Main buoy, 7-Diagonal brace, 8-Mooring cable, 9-Heave plate, 10-PTO system, 11-Hydraulic power generation system, 12-Vertical guide pile, 13-Bullet, 14-Limit block, 15-Flange, 16-Fixed ballast tank, 17-Hydraulic pipeline, 18-Hydraulic cylinder, 19-Adjustable ballast tank, 20-Cable guide hole, 21-Check valve, 22-Accumulator, 23-Ball valve, 24-Throttle valve, 25-Generator, 26-Variable displacement hydraulic motor, 27-Flow meter, 28-Relief valve, 29-Oil tank, 30-Oil suction filter, 31-Stop valve, 32-Submersible pump, 33-Pressure sensor, 34-Wind speed sensor, 35-Data acquisition system, 36-Attitude sensor, 37-Controller. Detailed implementation method:

[0033] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0034] like Figure 1-5 As shown, a floating wave energy-wind energy integrated power generation system includes a floating wind energy power generation device and a wave energy power generation device sharing a semi-submersible platform 3. The semi-submersible platform 3 can serve as a floating foundation for the floating wind energy power generation device and as a float for the wave energy power generation device.

[0035] The semi-submersible platform 3 includes a central column 5 and three main buoys 6. The main buoys 6 are distributed at the three vertices of an equilateral triangle, forming a 60° angle with each other. The central column 5 is located at the center of the equilateral triangle. The central column 5 and the main buoys 6 are connected by a horizontal brace 4 and a diagonal brace 7.

[0036] The floating wind power generation device consists of a wind turbine 1, a tower 2, and a semi-submersible platform 3. The wind turbine is installed at the top of the tower 2, and the bottom of the tower 2 is fixed to the central column of the semi-submersible platform 3.

[0037] The wave energy power generation device includes a semi-submersible platform 3, a PTO system 10, a hydraulic power generation system 11, and a heave plate 9. The semi-submersible platform 3 and the heave plate 9 are connected by a vertical guide pile 12 and a hydraulic cylinder 18. The bottom end of the vertical guide pile 12 is fixed to the heave plate 9 by a flange 15. The vertical guide pile 12 extends through the bottom of the main buoy 6 and into the interior of the main buoy 6, ensuring that the semi-submersible platform 3 can move vertically along the vertical guide pile 12. The hydraulic cylinder 18 is installed between the main buoy 6 of the semi-submersible platform 3 and the heave plate 9. The relative movement of the semi-submersible platform 3 and the heave plate 9 drives the hydraulic rod to move, and the hydraulic oil in the hydraulic cylinder 18 is pressed into the hydraulic power generation system 11 through the hydraulic pipeline 17, converting wave energy into hydraulic energy, and then driving the generator 25 to generate electricity.

[0038] Limiting blocks 14 are installed on the upper part of the vertical guide pile 12 to prevent the relative displacement of the semi-submersible platform 3 and the heave plate 9 from exceeding the stroke range of the hydraulic cylinder 18.

[0039] The interior of the heave plate 9 is divided into a fixed ballast tank 16 and an adjustable ballast tank 19. A mooring cable guide hole 20 is provided at the bottom of the heave plate 9 to improve the power generation efficiency of wave energy.

[0040] The hydraulic power generation system includes a hydraulic cylinder 18, a one-way valve 21, an accumulator 22, a ball valve 23, a throttle valve 24, a variable displacement hydraulic motor 26, a generator 25, a relief valve 28, an oil tank 29, and an oil suction filter 30 connected to each other. Hydraulic oil is forced into the hydraulic pipeline 17 by the relative movement of the semi-submersible platform 3 and the heave plate 9. When the pressure in the hydraulic pipeline 17 is higher than a predetermined pressure, some hydraulic oil flows into the accumulator 22 to store hydraulic oil energy. When the energy storage reaches the pressure of the relief valve 28, the relief valve 28 opens, and excess hydraulic oil returns to the oil tank 29 through the relief valve 28. When the pressure in the hydraulic pipeline is lower than the predetermined pressure, hydraulic oil from the accumulator 22 flows into the pipeline to replenish the pressure. The pressure in the hydraulic pipeline is stabilized by the accumulator 22 and the relief valve 28. The speed of the hydraulic motor is controlled by the throttle valve 24, allowing the generator 25 to maintain high-efficiency power generation.

[0041] The integrated power generation system also includes a ballast water regulation system, comprising a submersible pump 32, ballast water pipelines, a data acquisition system 35, a pressure sensor 33, a controller 37, an attitude sensor, a battery, a wind speed sensor 34, and a ballast tank. The submersible pump 32 is located in the adjustable ballast tank 19 of the heave plate 9. The ballast water pipelines connect the adjustable ballast tanks 19 in the three heave plates along the vertical guide piles 12 and the cross braces 4. The pressure sensor 33 is installed at the bottom of the adjustable ballast tank 12 to monitor the volume of ballast water in the adjustable ballast tank 12.

[0042] The attitude sensor 36 is installed at the bottom of the central column 5 to measure the attitude of the integrated power generation system in real time. The data acquisition system 35 and the controller 37 are located at the bottom of the central column 5. The data acquisition system 35 collects meteorological data, attitude data of the integrated power generation system, and pressure data of the adjustable ballast tank. The controller 37 is used to redistribute ballast water, issue control commands, control the opening and closing of the submersible pump 32 and the shut-off valve 31, complete the ballast water adjustment, and then adjust the mass of the adjustable ballast water in the three heave plates 9 to counteract the fixed tilt angle of the semi-submersible platform 3 caused by the average wind load, thereby improving the power generation effect of the floating wind power generation device and the wave power generation device.

[0043] A method for adjusting the center of gravity of a floating wave energy-wind energy integrated power generation system includes the following steps:

[0044] S1: Obtain the average wind speed of the wind field near the wind and wave integrated system based on meteorological data or wind speed sensors, and use this as the initial input;

[0045] S2, calculate the wind load by the thrust curve of the wind turbine, and calculate the magnitude and direction of the wind load on the semi-submersible platform based on the windward area above the waterline of the semi-submersible platform.

[0046] S3, based on the calculated wind load, allocates the capacity of the three variable ballast chambers through moment balance;

[0047] S4, the controller starts the corresponding submersible pump and shut-off valve to adjust and balance the ballast water;

[0048] S5 determines the average pitch angle per hour to further adjust the ballast water.

[0049] A method for reducing sway using a floating wave-wind energy integrated power generation system includes the following steps:

[0050] S1, Sets the wave height range for PTO system anti-roll adjustment, H s To initiate the wave height, H f To terminate the wave height;

[0051] S2, real-time detection and acquisition of wave height H, pitch angle of integrated power generation system, vertical displacement of each main buoy, and displacement of hydraulic rods inside the main buoy;

[0052] S3, determine the relative relationship between the real-time detected wave height H and the wave height range; when H < H s At that time, the wave energy power generation device achieves maximum power by adjusting the throttle valve opening and the PTO system according to the optimal damping adjustment; when H s <H<H f When the heave displacement of the main buoy is in phase with the displacement of its internal hydraulic rod, the throttle valve is opened; otherwise, it is closed. When H > H fAt this time, the hydraulic cylinder is moved downwards to the bottom to maximize the distance between the heave plate and the semi-submersible platform, and the throttle valve is closed.

[0053] The working principle of a floating wave energy-wind energy integrated power generation system in this invention embodiment is as follows: By orderly combining a floating wind energy generator and a wave energy generator, the platform center can be adjusted, the fixed tilt angle of the offshore platform caused by the aerodynamic forces of the wind turbine can be improved, the power generation efficiency of the wind energy generator and the wave energy generator can be increased, and the damping of the PTO system of the wave energy generator can be adjusted to suppress the pitching of the floating platform, improve the platform's seakeeping, reduce fatigue damage, and reduce structural load. At the same time, it shares the mooring system, power infrastructure and other components of the wind farm to reduce the overall project cost. The generation of wave energy can make up for the intermittency of offshore wind power, and the marine renewable resources can be deeply developed through wind and wave complementarity.

[0054] Since existing floating wind power generation devices and wave power generation devices are set up separately, they have many shortcomings such as high mooring costs, high power transmission costs, and short effective power generation time. Therefore, it is necessary to combine floating wind power generation devices and wave power generation devices in an orderly manner. At present, the floating wind-wave integrated power generation system mainly integrates the wave power generation device directly into the floating wind power platform.

[0055] Specifically, the invention patent with application number 201911342234.3 discloses a floating wind-wave energy combined power generation device and its control method, which integrates three swing-arm wave energy power generation devices onto the three main columns of a floating wind power platform. By adjusting the throttle valve of the hydraulic system of the wave energy power generation device, the stability of the system is improved and the structural load is reduced. The invention patent with application number 202110270954.4 discloses a semi-submersible offshore wind and wave energy combined power generation device, which integrates an oscillating float-type wave energy power generation device onto a floating wind power platform. By adjusting the draft of the float of the wave energy power generation device, the float mechanism is improved to enhance the risk avoidance capability.

[0056] The aforementioned existing direct integration methods will affect the performance of the original floating wind power platform, making it unable to generate electricity stably and efficiently, which may cause serious losses.

[0057] To address the shortcomings of existing technologies, the orderly combination method described in this application can be adopted. Specifically, the integrated power generation system includes a floating wind power generation device and a wave power generation device sharing a semi-submersible platform 3. The semi-submersible platform 3 can serve as both a floating foundation for the floating wind power generation device and a float for the wave power generation device.

[0058] The semi-submersible platform 3 includes a central column 5 and three main buoys 6. The main buoys 6 are distributed at the three vertices of an equilateral triangle, forming a 60° angle with each other. The central column 5 is located at the center of the equilateral triangle. The central column 5 and the main buoys 6 are connected by a horizontal brace 4 and a diagonal brace 7.

[0059] The floating wind power generation device consists of a wind turbine 1, a tower 2, and a semi-submersible platform 3. The wind turbine is installed at the top of the tower 2, and the bottom of the tower 2 is fixed to the central column of the semi-submersible platform 3.

[0060] The wave energy power generation device includes a semi-submersible platform 3, a PTO system 10, a hydraulic power generation system 11, and a heave plate 9. The semi-submersible platform 3 and the heave plate 9 are connected by a vertical guide pile 12 and a hydraulic cylinder 18. The bottom end of the vertical guide pile 12 is fixed to the heave plate 9 by a flange 15. The vertical guide pile 12 extends through the bottom of the main buoy 6 and into the interior of the main buoy 6, ensuring that the semi-submersible platform 3 can move vertically along the vertical guide pile 12. The hydraulic cylinder 18 is installed between the main buoy 6 of the semi-submersible platform 3 and the heave plate 9. The relative movement of the semi-submersible platform 3 and the heave plate 9 drives the hydraulic rod to move, and the hydraulic oil in the hydraulic cylinder 18 is pressed into the hydraulic power generation system 11 through the hydraulic pipeline 17, converting wave energy into hydraulic energy, and then driving the generator 25 to generate electricity.

[0061] Limit blocks are installed on the upper part of the vertical guide pile to prevent the relative displacement between the semi-submersible platform and the heave plate from exceeding the stroke range of the hydraulic cylinder; the interior of the heave plate is divided into a fixed ballast tank and an adjustable ballast tank, and a guide hole for the mooring cable is provided at the bottom of the heave plate to improve the power generation efficiency of wave energy.

[0062] Furthermore, the hydraulic power generation system of the wave energy power generation device consists of a hydraulic cylinder, a check valve, an accumulator, a ball valve, a throttle valve, a variable displacement hydraulic motor, a generator, a relief valve, an oil tank, and an oil suction filter. Through the relative movement of the semi-submersible platform and the heave plate, hydraulic oil is forced into the hydraulic pipeline. When the pressure in the hydraulic pipeline is higher than the predetermined pressure, some hydraulic oil flows into the accumulator to store energy. When the accumulator is full and reaches the pressure of the relief valve, the relief valve opens, and excess hydraulic oil returns to the oil tank through the relief valve. When the pressure in the hydraulic pipeline is lower than the predetermined pressure, hydraulic oil from the accumulator flows into the pipeline to replenish the pressure. The pressure in the hydraulic pipeline is stabilized by the accumulator and relief valve, and the speed of the hydraulic motor is controlled by the throttle valve, allowing the generator to maintain high-efficiency power generation.

[0063] To improve the power generation performance of floating wind and wave power generation devices, a ballast water regulation system is installed in the overall system. The ballast water regulation system consists of submersible pumps, ballast water pipelines, data acquisition systems, pressure sensors, controllers, attitude sensors, batteries, wind speed sensors, ballast tanks, etc.

[0064] The submersible pump is located in the adjustable ballast tank within the heave plate. Ballast water pipelines connect the three adjustable ballast tanks in the heave plate along vertical guide piles and cross braces. Pressure sensors are installed at the bottom of the adjustable ballast tanks to monitor the volume of ballast water within them. Attitude sensors are installed at the bottom of the central column to measure the attitude of the integrated system in real time. The data acquisition system and controller are located at the bottom of the central column. The data acquisition system collects data such as meteorological data, integrated system attitude data, and adjustable ballast tank pressure data, enabling the controller to redistribute ballast water, issue control commands, and control the opening and closing of the submersible pump and shut-off valves to complete the ballast water adjustment. By adjusting the mass of the adjustable ballast water in the three heave plates, the fixed tilt angle of the semi-submersible platform caused by the average wind load is offset, improving the power generation efficiency of the wind turbine and wave energy generation device.

[0065] In this application, the average wind speed of the wind field near the wind-wave integrated system can be obtained based on meteorological data or wind speed sensors. Using this as the initial input, the wind load is calculated through the wind turbine thrust curve. The wind load on the semi-submersible platform is calculated based on the windward area above the waterline. Based on the calculated wind load, the capacity of each variable ballast tank is calculated through torque balancing. According to the current ballast tank capacity, the corresponding submersible pumps and shut-off valves are activated via the controller to adjust and balance the ballast water. Using a tilt sensor as feedback, the ballast water is further adjusted by determining the pitch angle of the wind-wave foundation system.

[0066] It is worth noting that this application can improve the platform's wave resistance and reduce fatigue damage by employing roll reduction measures. The specific roll reduction steps are as follows: First, set the wave height range for PTO system roll reduction adjustment, with Hs as the starting wave height and Hf as the ending wave height. Second, monitor the wave height H, the pitch angle of the wind-wave integrated system, the vertical displacement of each main buoy, and the displacement of the hydraulic rods inside the main buoys in real time. Then, determine the wave height range. When H < Hs, adjust the throttle valve opening according to optimal damping to maximize the power of the wave energy generator. When Hs < H < Hf, if the heave displacement of the main buoy is in phase with the displacement of its internal hydraulic rod, open the throttle valve; otherwise, close the throttle valve. When H > Hf, move the hydraulic cylinder downwards to the bottom to maximize the distance between the heave plate and the semi-submersible platform, and close the throttle valve. Repeat the above steps until operation stops.

[0067] In summary, the floating wave-wind energy integrated power generation system in this embodiment of the invention combines floating wind power generation devices and wave power generation devices in an orderly manner. It can adjust the platform center, improve the fixed tilt angle of the offshore platform caused by the aerodynamic forces of the wind turbine, improve the power generation efficiency of the wind power generation devices and wave power generation devices, and further adjust the PTO system damping of the wave power generation devices to suppress the pitching of the floating platform, improve the platform's seakeeping, reduce fatigue damage, and reduce structural load. At the same time, it shares mooring systems, power infrastructure, and other components of the wind farm to reduce the overall project cost. The generation of wave energy can compensate for the intermittency of offshore wind power, and deeply develop marine renewable resources through wind-wave complementarity.

[0068] The above specific embodiments should not be construed as limiting the scope of protection of the present invention. For those skilled in the art, any alternative improvements or modifications made to the embodiments of the present invention shall fall within the scope of protection of the present invention.

[0069] Any aspects of this invention not described in detail are well-known to those skilled in the art.

Claims

1. A floating wave energy-wind energy integrated power generation system, characterized in that: The integrated power generation system includes a floating wind power generation device and a wave power generation device that share a semi-submersible platform. The semi-submersible platform includes a central column and three main buoys. The main buoys are distributed at the three vertices of an equilateral triangle, and the central column is located at the center of the equilateral triangle. The central column and the main buoys are connected by horizontal and diagonal braces. The floating wind power generation device includes a wind turbine, a tower, and a semi-submersible platform. The wind turbine is installed at the top of the tower, and the bottom of the tower is fixed to the central column of the semi-submersible platform. The wave energy power generation device includes a semi-submersible platform, a PTO system, a hydraulic power generation system, and a heave plate. The semi-submersible platform and the heave plate are connected by a vertical guide pile and a hydraulic cylinder. The bottom end of the vertical guide pile is fixed to the heave plate by a flange. The vertical guide pile passes through the bottom of the main buoy and extends into the main buoy, ensuring that the semi-submersible platform can move vertically along the vertical guide pile. The hydraulic cylinder is installed between the main buoy of the semi-submersible platform and the heave plate. The relative movement of the semi-submersible platform and the heave plate drives the hydraulic rod to move, which in turn forces the hydraulic oil in the hydraulic cylinder into the hydraulic power generation system through hydraulic pipelines, converting wave energy into hydraulic energy, and then driving the generator to generate electricity. The interior of the heave plate is divided into fixed ballast tanks and adjustable ballast tanks; The integrated power generation system also includes a ballast water regulation system, comprising a submersible pump, ballast water pipelines, a data acquisition system, pressure sensors, a controller, an attitude sensor, a battery, a wind speed sensor, and ballast tanks. The submersible pump is located in an adjustable ballast tank of the heave plate. The ballast water pipelines connect the adjustable ballast water tanks in the three heave plates along vertical guide piles and cross braces. Pressure sensors are installed at the bottom of the adjustable ballast water tanks to monitor the volume of ballast water in the adjustable ballast water tanks. The attitude sensor is installed at the bottom of the central column to measure the attitude of the integrated power generation system in real time. The data acquisition system and controller are located at the bottom of the central column. The data acquisition system collects meteorological data, attitude data of the integrated power generation system, and pressure data of the adjustable ballast water tank. The controller is used to redistribute ballast water, issue control commands, control the opening and closing of the submersible pump and the shut-off valve, complete the ballast water adjustment, and then adjust the mass of the adjustable ballast water in the three heave plates to counteract the fixed tilt angle of the semi-submersible platform caused by the average wind load. The method for adjusting the center of gravity of an integrated power generation system includes the following steps: S1: Obtain the average wind speed of the wind field near the integrated system based on meteorological data or wind speed sensors, and use this as the initial input; S2, calculate the wind load by the thrust curve of the wind turbine, and calculate the magnitude and direction of the wind load on the semi-submersible platform based on the windward area above the waterline of the semi-submersible platform. S3, based on the calculated wind load, allocates the capacity of the three variable ballast chambers through moment balance; S4, the controller starts the corresponding submersible pump and shut-off valve to adjust and balance the ballast water; S5, determine the average pitch angle per hour to further adjust the ballast water; The method for reducing sway in an integrated power generation system includes the following steps: S1, Sets the wave height range for PTO system anti-roll adjustment, H s To initiate the wave height, H f To terminate the wave height; S2, real-time detection and acquisition of wave height H, pitch angle of integrated power generation system, vertical displacement of each main buoy, and displacement of hydraulic rods inside the main buoy; S3, determine the relative relationship between the real-time detected wave height H and the wave height range; when H < H s At that time, the wave energy power generation device achieves maximum power by adjusting the throttle valve opening and the PTO system according to the optimal damping adjustment; when H s <H<H f When the heave displacement of the main buoy is in phase with the displacement of its internal hydraulic rod, the throttle valve is opened; otherwise, it is closed. When H > H f At this time, the hydraulic cylinder is moved downwards to the bottom to maximize the distance between the heave plate and the semi-submersible platform, and the throttle valve is closed.

2. The floating wave energy-wind energy integrated power generation system according to claim 1, characterized in that: Limit blocks are installed on the upper part of the vertical guide pile to prevent the relative displacement between the semi-submersible platform and the heave plate from exceeding the stroke range of the hydraulic cylinder.

3. The floating wave energy-wind energy integrated power generation system according to claim 1, characterized in that: The hydraulic power generation system includes interconnected hydraulic cylinders, check valves, accumulators, ball valves, throttle valves, variable displacement hydraulic motors, generators, relief valves, oil tanks, and suction filters. Hydraulic oil is forced into the hydraulic lines through the relative motion of the semi-submersible platform and the heave plate. When the pressure in the hydraulic lines exceeds a predetermined pressure, some hydraulic oil flows into the accumulator to store energy. When the energy storage reaches the pressure of the relief valve, the relief valve opens, and excess hydraulic oil returns to the oil tank via the relief valve. When the pressure in the hydraulic lines falls below a predetermined pressure, hydraulic oil from the accumulator flows into the lines to replenish the pressure. The accumulator and relief valve stabilize the pressure in the hydraulic lines, and the throttle valve controls the speed of the hydraulic motor, enabling the generator to maintain high power generation efficiency.

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