Experimental device and method for oscillating float integrated system based on floating wind turbine

Abstract

The present invention discloses an experimental device and method for an oscillating float integrated system based on a floating wind turbine, which belongs to the field of wind power generation technology. The present invention realizes the establishment of a coupled dynamic model of a point-suction oscillating float and a floating wind turbine integrated system, which can more accurately evaluate the performance of the system in an actual marine environment. At the same time, it realizes the establishment of a physical experimental model of a hydraulic wave energy conversion system, taking into account the influence of the nonlinear characteristics of the hydraulic system on the performance of the integrated system, thereby improving the accuracy and reliability of the experimental results. The wind turbine impeller rotation speed of the present invention is controllable in real time, and the dynamic characteristics of the integrated system under different tip speed ratios can be considered, thereby better optimizing the performance and efficiency of the system. The invention realizes the all-round monitoring of the hydrodynamic performance of the integrated system, which is conducive to revealing the coupled dynamic characteristics of complex integrated systems, and provides important data support for system optimization and safety assessment.

Description

Technical Field

[0001] The present invention relates to the field of wind power generation technology, in particular to the field of scaled model testing technology for floating wind turbine integrated wave energy devices, and more particularly to a design method for a towing tank test operating condition of a wind-wave integrated system, specifically to an experimental device and method for an oscillating float integrated system based on a floating wind turbine. Background Art

[0002] Compared to land and nearshore shallow waters, offshore wind energy resources are more stable, abundant, and of higher quality. However, traditional fixed wind turbines are not suitable for waters deeper than 30 meters. Therefore, research into deep-sea floating wind turbines will undoubtedly become a leading direction for future development. In addition to wind energy, the ocean also contains a variety of energy sources, including solar energy, wave energy, and tidal energy. Consequently, the concept of offshore multi-energy complementary systems has been proposed and is beginning to develop. Multi-energy complementary systems offer multiple advantages: First, hybrid systems share platforms, mooring systems, and other power generation facilities, reducing construction costs. Second, multi-energy complementary systems can improve power generation stability, offset the intermittent nature of single-source power generation, and increase energy capture capacity per unit area. Compared to other marine energy sources, wave energy is abundant and easy to develop, making it one of the most mature energy sources currently under development. The complementary advantages between wave energy and wind energy are significant, leading to the rapid development of wind-wave complementary power generation technology.

[0003] The integrated system of floating wind turbines and wave energy devices is complex, primarily comprising a floating foundation, wind turbines, wave energy devices, and mooring systems. These systems are situated in a complex offshore environment, subject to the combined effects of wind and wave loads, and the mutual influence of various structures. This makes it extremely difficult to study the system dynamics using numerical methods. Therefore, experimental methods are needed to analyze the motion response under wind-wave coupling. By studying the mutual influence between floating wind turbines and wave energy devices, the motion patterns and safety of the entire floating system can be explored. However, a physical model experimental design method for multi-energy complementary platforms is currently lacking, and there is an urgent need to develop methods for experimentally exploring the coupled dynamics of integrated systems.

[0004] After searching, the utility model patent with Chinese patent application number CN216477675U proposed a floating wind-wave complementary energy integration system based on wave pressure power generation, designed a new floating power generation device, and proposed a multi-airbag wave energy device to improve the efficiency of wave energy utilization, realizing the organic combination of wind and wave energy. However, the proposed integrated device only realizes multi-energy complementarity in the design concept, and does not provide an explanation of the specific experimental evaluation method for the performance of the device, that is, it does not consider the evaluation method of the overall motion performance and power characteristics of the device under specific external conditions. The experimental model and experimental method proposed in this patent are aimed at the problem of performance evaluation, and have designed and improved the experimental physical signal monitoring system and data processing method, which can accurately give the motion characteristics and power characteristics of the wind-wave integrated system under certain external load conditions, providing a reference for actual engineering.

[0005] In a floating wind-wave complementary energy integration system based on wave pressure power generation, the wave energy device and the floating foundation of the floating wind-wave complementary energy integration system are completely fixed, and the impact of the relative movement of the wave energy device in the ocean on the performance of the integrated system is not considered. To address this problem, this patent designs a vertical hinged constraint device that can be used on a floating foundation, which can ensure that the wave energy device maintains a consistent movement trend with the floating foundation in all directions other than the vertical oscillation direction, while the wave energy device and the floating foundation produce relative movement in the vertical oscillation direction. The relative movement and mutual interference between multiple floating bodies are complex problems that urgently need to be solved in actual marine engineering. This patent provides a physical experimental evaluation method for this problem.

[0006] In a floating wind-wave hybrid energy system based on wave pressure power generation, the wave energy device generates electricity through the accelerated airflow generated by multiple airbags, driving a turbine generator. However, this does not account for the unstable air velocity caused by the dramatic changes in wave period and wave height in the actual ocean, which can lead to insufficient energy conversion efficiency. To address this issue, the energy conversion system designed in this patent adopts a more stable hydraulic energy conversion system. By relying on the high-pressure and low-pressure accumulator cylinders to smooth pressure changes in the pipeline system, it can achieve stable power output even in the actual ocean. Summary of the Invention

[0007] The present invention proposes an experimental device and method for an oscillating float integrated system based on a floating wind turbine, which realizes the establishment of a coupled dynamic model of the integrated system of a point-suction oscillating float and a floating wind turbine, and can more accurately evaluate the performance of the system in an actual marine environment. At the same time, it realizes the establishment of a physical experimental model of a hydraulic wave energy conversion system, thereby improving the accuracy and reliability of the experimental results.

[0008] To achieve the above object, the technical solution adopted by the present invention is:

[0009] An experimental device for an oscillating float integrated system based on a floating wind turbine generator set is characterized in that it includes a swaying pool, the water bank of the swaying pool is set as an energy dissipation bank, an environmental load simulation system, a mooring system and a wind-wave integrated system are arranged in the swaying pool, the environmental load simulation system includes a wind load device for generating wind and a wave load device for generating waves, one end of the mooring system is fixed to the bottom of the swaying pool, and the other end is connected to the wind-wave integrated system, the wind-wave integrated system floats on the water surface of the swaying pool, and after obtaining the specific wind speed through the wind load device, it is adjusted to the input parameter of the wind load device according to formula 1, the wind direction is achieved by adjusting the angle between the wind load device and the wind-wave integrated system, and the turbulence degree of the wind speed is adjusted by adjusting the distance between the wind load device and the wind-wave integrated system.

[0010] y1=7.21x1 3 -8.2509x1 2 +6.4102x1+0.0129(1)

[0011] Among them, y1 is the target wind speed, x1 is the load factor,

[0012] After obtaining the specific wave height and period through the wave load device, they are converted into the input parameters of the wave load device according to formula (2).

[0013]

[0014] Where y is the wave load device transfer coefficient, x is the wave period,

[0015] A data acquisition device is also provided on the water surface of the swaying pool. The data acquisition device includes a thermal anemometer and a wave height meter. The thermal anemometer is arranged between the wind load device and the wind and wave integrated system. The wave height meter is arranged in front of and behind the wind load device and the wind and wave integrated system.

[0016] The wind-wave integrated system includes a floating wind turbine and a wave energy conversion device. The wind turbine includes a wind turbine, an aluminum profile frame, and a floating foundation. The floating foundation includes a float array consisting of six wave energy floats and lifting lugs. The lifting lugs are provided with at least three or more and are interconnected by the aluminum profile frame. The wind turbine is installed on any of the lifting lugs. The wave energy float is installed on the aluminum profile frame through vertical hinge constraints. No relative movement other than the vertical direction occurs between the wave energy float and the aluminum profile frame.

[0017] It also includes a linear displacement sensor probe, a linear displacement sensor, a hydraulic working cylinder and a tension sensor installed on the aluminum profile frame. The wave energy float is connected to the straight rod of the hydraulic working cylinder through the tension sensor. The straight rod is connected to the piston of the hydraulic working cylinder. The pull rope of the linear displacement sensor is connected to the wave energy float.

[0018] The wave energy conversion device includes a piping system, an energy conversion system load and an energy storage cylinder. The hydraulic working cylinder and the energy storage cylinder are connected by a piping system. A one-way valve and a tee are installed on the piping system. The outlet of the tee is connected to the inlet of the energy storage cylinder. The device also includes a hydraulic box. A hydraulic valve is provided on the hydraulic box. The piping system is connected to the hydraulic valve. The one-way valve is installed between the hydraulic box and the hydraulic working cylinder. The energy conversion system load is located on the top of the energy storage cylinder and includes a load insert, a load frame and an energy storage cylinder fixing frame. The energy storage cylinder is fixed by the energy storage cylinder fixing frame. A load is installed above the energy storage cylinder. The load frame is provided with a load insert. When the piston in the hydraulic working cylinder is driven upward by the wave energy float, the liquid in the upper half of the piston is squeezed through the one-way valve and enters the energy storage cylinder, while the volume of the cavity in the lower part of the piston expands, the pressure is reduced, and the liquid is absorbed from the hydraulic tank into the hydraulic working cylinder. When the wave energy float drives the piston to move downward, the one-way valve restricts the flow direction, and the liquid neither flows from the hydraulic tank into the hydraulic working cylinder nor is pumped from the hydraulic working cylinder into the energy storage cylinder. As the liquid level in the energy storage cylinder rises, the load is also raised. At this time, the wave energy is converted into the potential energy of the load, realizing the conversion of wave energy.

[0019] As a preferred technical solution of the present invention: a trailer is provided on the bank of the swaying pool, and the trailer is used to fix the data acquisition equipment.

[0020] As a preferred technical solution of the present invention: the wave load device is a wave maker, and the wind load device is a wind maker.

[0021] As a preferred technical solution of the present invention: the wind turbine includes a power supply, a resistance controller, a monochrome display screen, a rotating connection node, a torque and speed sensor, an impeller and an electric motor, the impeller is connected to the electric motor through a rotating connection node, the torque and speed sensor is connected to the electric motor for detecting the torque of the electric motor, the electric motor is connected to the power supply and powered by the power supply, the resistance controller is connected to the connection circuit between the electric motor and the power supply, the monochrome display screen is connected to the resistance controller, and the current in the circuit can be adjusted by the resistance controller.

[0022] As a preferred technical solution of the present invention: it also includes a mounting device for mounting a wave energy float, the mounting device includes a mounting seat and a mounting shaft, the mounting seat includes a guide rod fixing seat, a vertical hinged bearing and a bearing seat, the mounting shaft includes a float guide rod, a top opening is provided on the upper end surface of the wave energy float, the guide rod fixing seat is fixed at the center of the wave energy float, the top openings are respectively located on both sides of the guide rod fixing seat, the float guide rod is fixed in the guide rod fixing seat, a guide rod limiting hole is provided on the guide rod fixing seat, the bearing seat is installed on the vertical hinged bearing, a bearing limiting hole is provided on the bearing seat, the guide rod limiting hole and the bearing limiting hole are arranged correspondingly up and down, and the vertical intersection bearing and the bearing seat are respectively sleeved on the float guide rod and fixed thereon.

[0023] In the above structure: the experimental device of the oscillating float integrated system based on the floating wind turbine proposed in the present invention includes a swaying pool, the water bank of the swaying pool is set as an energy dissipation bank, an environmental load simulation system, a mooring system and a wind and wave integrated system are arranged in the swaying pool, the environmental load simulation system includes a wind load device for wind generation and a wave load device for wave generation, one end of the mooring system is fixed to the bottom of the swaying pool, and the other end is connected to the wind and wave integrated system, the wind and wave integrated system floats on the water surface of the swaying pool, the wind and wave integrated system includes a floating foundation, a floating foundation, a floating foundation and a floating foundation. The floating foundation is constrained in the water pool by a mooring system. Therefore, under the action of wave loads and wind loads, the mooring system can maintain the wind and wave integrated system from large-scale movement. Under the action of wave force, the floating foundation moves in six degrees of freedom. The wave energy float is fixed to the floating foundation through a vertical hinge constraint. There is no relative movement between the two except in the vertical direction. The wave energy float is connected to the straight rod of the hydraulic working cylinder through a tension sensor, and the straight rod is connected to the piston. According to this process, the wave energy float drives the energy conversion system to realize the conversion of wave energy.

[0024] The center of gravity of the floating foundation can be adjusted, and the specifications of the sandbags used to adjust the center of gravity can be set to 3 or more to ensure sufficient adjustment accuracy.

[0025] The wind turbine is fixed on a tower on a floating foundation. The impeller is connected to a torque and speed sensor and an electric motor. Different currents can make the impeller rotate at different speeds. These parts are placed in the nacelle. Under the influence of the wind speed in the experimental environment, the impeller of the wind turbine maintains a stable speed through a speed control system, simulating the aerodynamic load characteristics of the wind turbine.

[0026] The aluminum profile frame includes a connecting beam, a cross beam, a vertical beam and a thin cross beam, and adjacent lifting ears are connected by a connecting beam, the vertical beam is vertically fixed to the connecting beam, the cross beam and the thin cross beam are respectively fixed to the vertical beam, the cross beam and the thin cross beam are arranged parallel to the connecting beam, and the thin cross beam and the cross beam are respectively provided with two groups, the connecting beam is provided with a cross beam limiting hole, the vertical beam is installed therein and is limited by the cross beam limiting hole, the two groups of cross beams are respectively provided with an aluminum profile frame limiting groove and a thin cross beam positioning hole, which are respectively used to fix the vertical beam and the thin cross beam, the vertical beam is provided with a cross beam bolt hole, which is used to fix the cross beam, and the aluminum profile frame can be placed on a floating foundation through the bolt hole, and is further provided with a linear displacement sensor probe, a linear displacement sensor, a hydraulic working cylinder and a tension sensor installed on the aluminum profile frame, the wave energy float is connected to the straight rod of the hydraulic working cylinder through the tension sensor, the straight rod is connected to the piston of the hydraulic working cylinder, and the pull rope of the linear displacement sensor is connected to the wave energy float,

[0027] The wave energy conversion device includes a piping system, an energy conversion system load, and an energy storage cylinder. The hydraulic working cylinder and the energy storage cylinder are connected by a piping system. The outlet of the tee is connected to the inlet of the energy storage cylinder. A hydraulic valve is provided on the hydraulic box. The piping system is connected to the hydraulic valve. A one-way valve is installed between the hydraulic box and the hydraulic working cylinder. The energy conversion system load is located on the top of the energy storage cylinder and includes a load insert, a load frame, and an energy storage cylinder fixing frame. The load sheet is made of steel, and its shape and thickness are designed according to the target quality.

[0028] The energy conversion process is as follows: when the piston in the hydraulic working cylinder is driven upward by the wave energy float, the liquid in the upper part of the piston is squeezed through the one-way valve into the energy storage cylinder, while the volume of the cavity under the piston expands, the pressure is reduced, and the liquid is absorbed from the hydraulic tank into the hydraulic working cylinder. When the wave energy float drives the piston downward, the one-way valve restricts the flow direction. The liquid neither flows from the hydraulic tank into the hydraulic working cylinder nor is pumped from the hydraulic working cylinder into the energy storage cylinder. As the liquid level in the energy storage cylinder rises, the load is also raised. At this time, the wave energy is converted into the potential energy of the load, realizing the conversion of wave energy.

[0029] The thermal anemometer is arranged between the wind load device and the physical model of the wind and wave integrated system. 2-3 wave height meters are arranged between the wave maker and the physical model, and 2 to 3 are arranged behind the physical model. The tension sensor is arranged between the wave energy float and the hydraulic working cylinder. One end of the tension sensor is connected to the bolt hole at the top of the float guide rod, and the other end is connected to the floating joint. One end of the tension sensor is connected to the lifting lug of the floating foundation through a shackle, and the other end is tied to the wire rope of the mooring system. There are two ways to arrange the linear displacement sensor. One is to fix the linear displacement sensor on the floating foundation, and the pull rope head of the linear displacement sensor is screwed together with the screw on the float; the other is to fix the linear displacement sensor on the energy storage steel fixing frame on the trailer, and the pull rope head of the linear displacement sensor is screwed together with the screw on the load frame. It also includes an optical six-degree-of-freedom instrument, which is fixed on the trailer railing. The linear displacement sensor probe is arranged on the floating foundation. The above sensor signal lines are all connected to the data acquisition instrument. After the data acquisition instrument processes the electrical signal, it is converted into a physical signal and stored in the working condition control machine.

[0030] The motor adopts a 57 stepper motor, the resistance controller is a sliding rheostat, the motor and the sliding rheostat are connected by wires, the motor signal outlet is connected to the monochrome display screen by wires, and the sliding rheostat is connected to the power supply to realize power supply.

[0031] The bottom of the energy dissipation bank is filled with nylon material to absorb wave energy.

[0032] An experimental method for an oscillating float integrated system based on a floating wind turbine generator system is characterized by comprising the following steps:

[0033] S1. Layout of the experimental site and the physical model of the wind-wave integrated system;

[0034] S2. Calibration of data test equipment and test environment;

[0035] S3, experimental testing and data collection;

[0036] S4. Post-processing of experimental data.

[0037] As a preferred technical solution of the present invention: in step S1,

[0038] S11. Layout of the test site:

[0039] Adjust the wind turbine and trailer to the preset position, and arrange the physical model of the wind and wave integrated system at a distance of three times the wavelength from the wave generator. First, adjust the center of gravity of the floating foundation, place the pre-made sandbags in the lifting lugs, and fine-tune the number of sandbags in each lifting lug so that the waterline is level with the waterline plane of the pool. Place the sandbags in the wave energy float. When the wave energy float can float in the water and the waterline is level with the waterline plane of the pool, fill the wave energy float with foaming agent to fix the position of the sandbags, and seal the top opening with waterproof tape. Arrange horizontal mooring lines with alternating longitude and latitude on the guide rails of the pool trailer, determine the horizontal coordinates of the anchor block, and use a crane to anchor along the intersection of the longitude and latitude mooring lines. Connect the other end of the fixed line of the mooring system to the tension sensor, which is connected to the lifting lug of the floating foundation via a shackle.

[0040] S12. Layout of the physical model of the wind-wave integrated system:

[0041] The wind-wave integrated system physical experimental model was fixed to the aluminum profile frame using angle brackets and T-bolts. The hydraulic cylinder was fixed to the track of the aluminum profile frame using T-bolts. Hydraulic cylinders with different diameters and strokes were selected to analyze the effect of hydraulic damping force on the coupled dynamics of the wind-wave integrated system. Before the experiment, the wave energy float was manually moved to fill the wave energy conversion device with liquid. Different pipe diameters were selected for the piping system to explore the effect of different hydraulic damping.

[0042] A thermal anemometer is arranged between the wind turbine and the physical model of the wind and wave integrated system. The thermal anemometer is fixed on a hanger. The signal line of the thermal anemometer is pulled to one side of the pool through the hanger and connected to the data acquisition system. A wave height meter is arranged between the wave maker and the physical model of the wind and wave integrated system. At the same time, a wave height meter is also arranged behind the physical model of the wind and wave integrated system. The wave height meter in front of the model is fixed on the hanger, and the wave height meter at the rear is fixed on a rack suspended by a trailer. The signal lines are pulled to one side of the swaying pool and the trailer respectively. The linear displacement sensor on the physical model of the wind and wave integrated system and the pull cable are connected to the trailer. The arrangement of the force sensor is the same as that of the linear displacement sensor and the tension sensor. The linear displacement sensor is arranged on the energy storage cylinder fixing frame, and the probe of the linear displacement sensor is fixed on the load frame. The non-contact six-degree-of-freedom instrument consists of a motion capture system composed of three cameras and target detection points. The cameras are arranged on the railings of the trailer, and the detection points are arranged on the physical model of the wind and wave integrated system. The cameras are arranged in a triangular shape, and the capture range can reach both sides of the pool on the left and right, and the wave maker in the front. The detection points are arranged in a triangular shape on the barrel cover of the floating foundation or the nacelle of the wind turbine.

[0043] As a preferred technical solution of the present invention: in step S2, before the experiment begins, the data testing equipment needs to be calibrated, including the calibration of the wave height meter, linear displacement sensor, tension sensor, tension sensor and optical six-degree-of-freedom instrument;

[0044] S21. Calibration of data test equipment:

[0045] Calibrate the wave height meter: First, prepare the standard liquid and the standard liquid level reference. When the wave height meter is placed in the standard liquid, start the device and calibrate according to the instructions, including setting the zero point and the maximum liquid level value, recording the wave height meter display value and the actual liquid level at different liquid levels for subsequent calibration and correction. Use the recorded data to analyze the measurement accuracy of the wave height meter and make calibration adjustments. After confirming that the measurement results after calibration and adjustment meet the expectations, the wave height meter can be confirmed to have completed calibration.

[0046] Calibrate the linear displacement sensor: Use a vernier caliper to mark reference lines at different intervals on the pull cord of the linear displacement sensor. Pull the cord to reveal different reference lines. Record the numerical value and actual position data displayed by the linear displacement sensor for subsequent analysis and calibration adjustments. Evaluate the measurement accuracy of the linear displacement sensor by analyzing the data and make necessary calibration adjustments. Finally, retest the linear displacement sensor to confirm whether the measurement results after calibration and adjustment meet expectations, thus completing the calibration of the linear displacement sensor.

[0047] Calibrate the tension sensor and tension transducer: With the help of a standard force measuring instrument and a force reference object, connect the force reference object to the tension sensor and apply a standard tension to ensure that the direction of the tension is consistent with the measurement direction of the tension sensor. Under different tensions, record the value displayed by the tension sensor and the actual applied tension. These data will be used for subsequent calibration and correction;

[0048] Calibrate the optical 6DOF instrument: Place the calibration plate within the measurement range of the optical 6DOF instrument, ensuring complete coverage. Start the instrument and perform calibration according to the instrument's instructions, including zero point and range calibration. Record the displayed values and actual position data at different positions and angles for subsequent analysis and calibration adjustments. Use the recorded data to evaluate the measurement accuracy of the optical 6DOF instrument and make necessary calibration adjustments.

[0049] S22. Calibration of test environment:

[0050] The wind-generating and wave-generating capabilities of the experimental site need to be calibrated at the model location. Wind speed and wave height are collected using measuring instruments. The generated and subtracted parts before and after the collection time are removed during data analysis. The simulation of the environment is analyzed by calculating the average wind speed, regular wave height, and irregular wave spectrum. The degree of wind load simulation can be evaluated by comparing the average test wind speed with the target wind speed value. The degree of wave simulation can be evaluated by comparing the average test regular wave height with the target value and the test irregular wave spectrum with the target spectrum.

[0051] As a preferred technical solution of the present invention: in step S3, before the experiment officially begins, first ensure that the water surface in the pool is sufficiently calm. The interval between each set of experimental conditions should be more than 20 minutes. For the irregular wave experiment, the interval should be more than 35 minutes.

[0052] During the formal experiment, the wind turbine is started first, and then the "wind turbine control" system is started, the impeller speed is gradually increased to the target value, and then each signal sensor is started to ensure that the sensor is in normal working condition. Then the wave maker is started to monitor and record the incident wave height, incoming wind speed, six-degree-of-freedom motion of the wind and wave integration system, the motion response of the wave energy float, the thrust of the float on the energy conversion system, the lifting speed of the energy storage cylinder load, and the tension of the mooring system. The sensor data is monitored in real time. When an abnormal situation occurs, the experiment is stopped and checked. After the experiment is completed, the measured data is saved.

[0053] As a preferred technical solution of the present invention: in step S4, after the experiment is completed, the data is classified and stored, and data processing is carried out, including spectral analysis of the waves, and exploration of the frequency domain characteristics of the waves under the influence of floating body diffraction waves and radiation waves.

[0054] The displacement and output data of the wave energy float in the wind-wave integrated system are collected, and the hydrodynamic power characteristics of the wave energy device are obtained by referring to formula (3). Based on the lifting rate of the energy storage cylinder load, the overall power characteristics of the hydraulic system can be analyzed by referring to formula (4), and the secondary conversion efficiency of the wave energy device is explored.

[0055]

[0056]

[0057] in, represents the hydrodynamic power of the wave energy device, represents the overall power of the wave energy device, m is the mass of the load, V is the speed at which the load is lifted, and F PTO is the force exerted by the wave energy float on the energy conversion system,

[0058] Based on the six-degree-of-freedom data, the motion characteristics of the wind-wave integrated system are analyzed, the dynamic influence of the integrated wave energy device on the wind turbine is explored, the frequency domain analysis of the motion response time domain curve is performed, the coupling mechanism of the motion response of the wind-wave integrated system is explored, and the coupling relationship between the motion response and the mooring tension is analyzed in combination with the data of the tension sensor, and the hydrodynamic performance characteristics of the wind-wave integrated system are explored.

[0059] Based on the torque speed sensor in the physical model of the wind-wave integrated system, the torque variation characteristics of the wind turbine at different wind speeds are analyzed. Combined with the sensor speed value, the power output characteristics of the wind turbine are analyzed, and the overall power output performance of the wind turbine is explored.

[0060] Compared with the prior art, the present invention has the following beneficial effects:

[0061] 1. Analysis of the integrated hydrodynamic characteristics of wave energy devices and floating wind turbines:

[0062] The system described in this application allows researchers to analyze the hydrodynamic characteristics of integrated wave energy devices and floating wind turbines. By integrating the two energy sources, researchers can assess their interaction in complex water environments, thereby better understanding the performance of the overall system.

[0063] 2. Realize the relative motion of the model wave energy float array on the floating foundation:

[0064] The experimental setup and methods described in this application allow researchers to simulate and observe the relative motion of an array of model wave energy floats on a floating foundation. This is crucial for designing and optimizing wave energy conversion systems because it allows for a better understanding of the interaction between the floats and the waves.

[0065] 3. Realize the power characteristics analysis of wind turbines and wave energy devices:

[0066] The system in this application can be used to analyze the power characteristics of wind turbines and wave energy devices. This comprehensive analysis helps determine the energy output of the system under different environmental conditions, providing an important reference for practical engineering applications.

[0067] 4. Using hydraulic system to consider nonlinear energy conversion system characteristics:

[0068] The experimental apparatus and method of this application utilizes a hydraulic system to account for the nonlinear characteristics of the energy conversion system. This method can more accurately simulate and evaluate the nonlinear characteristics present in actual systems, facilitating more precise predictions of energy conversion efficiency and system response.

[0069] 5. The speed of wind turbines can be continuously adjusted:

[0070] The experimental device in this application can achieve purposeful and continuous adjustment of the wind turbine impeller speed through the wind turbine speed control system, match the incoming wind speed, and simulate an integrated system under any tip speed ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 Schematic diagram of the experimental site layout;

[0072] Figure 2 This is a schematic diagram of the wind and wave integrated system structure;

[0073] Figure 3 This is a top view of the wind and wave integrated system;

[0074] Figure 4 It is a structural diagram of the aluminum profile frame;

[0075] Figure 5 is a schematic diagram of a wave energy conversion device;

[0076] Figure 6 is a schematic diagram of the energy conversion system load;

[0077] Figure 7 This is a schematic diagram of the circuit design of the wind turbine;

[0078] Figure 8 Schematic diagram of the installation of wave energy float.

[0079] List of reference numerals:

[0080] 110. Wave generator; 120. Wind generator; 130. Thermal velocimeter; 140. Wind and wave integrated system; 150. Optical six-degree-of-freedom instrument; 160. Trailer; 170. Energy dissipation bank; 180. Wave height meter; 190. Mooring system; 210. Lifting lug; 220. Linear displacement sensor; 230. Wave energy float; 240. Aluminum profile frame; 250. Wind turbine; 260. Hydraulic cylinder; 270. Tension sensor; 280. Vertical hinge constraint; 290. Beam limit hole; 310. Beam bolt hole; 320. Linear displacement sensor probe; 330. Aluminum profile frame limit slot; 340. Thin beam positioning hole; 350. Thin beam ;360, one-way valve; 370, piping system; 380, energy conversion system load; 390, energy storage cylinder; 410, three-way valve; 420, hydraulic valve; 430, hydraulic box; 440, load insert; 450, load frame; 460, energy storage cylinder fixing frame; 470, power supply; 480, resistance controller; 490, monochrome display; 510, rotating connection node; 520, torque speed sensor; 530, impeller; 540, electric motor; 550, guide rod limit hole; 560, top opening; 570, vertical articulated bearing; 580, bearing seat; 590, bearing limit hole; 610, float guide rod; 620, guide rod fixing seat. DETAILED DESCRIPTION

[0081] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0082] like Figure 1-8As shown, the present invention proposes an oscillating float integrated system experimental device based on a floating wind turbine, including a swaying pool, wherein the water bank of the swaying pool is set as an energy dissipation bank 170, and an environmental load simulation system, a mooring system 190 and a wind and wave integrated system 140 are arranged in the swaying pool. The environmental load simulation system includes a wind load device for generating wind and a wave load device for generating waves. One end of the mooring system 190 is fixed to the bottom of the swaying pool, and the other end is connected to the wind and wave integrated system 140. The wind and wave integrated system 140 floats on the water surface of the swaying pool. After obtaining the specific wind speed through the wind load device, it is adjusted to the input parameter of the wind load device according to Formula 1. The wind direction is achieved by adjusting the angle between the wind load device and the wind and wave integrated system 140. The turbulence degree of the wind speed is adjusted by adjusting the distance between the wind load device and the wind and wave integrated system 140.

[0083] y1=7.21x1 3 -8.2509x1 2 +6.4102x1+0.0129(1)

[0084] Among them, y1 is the target wind speed, x1 is the load factor,

[0085] After obtaining the specific wave height and period through the wave load device, they are converted into the input parameters of the wave load device according to formula (2).

[0086]

[0087] Where y is the wave load device transfer coefficient, x is the wave period,

[0088] A data acquisition device is also provided on the water surface of the swaying pool. The data acquisition device includes a thermal anemometer and a wave height meter. The thermal anemometer is arranged between the wind load device and the wind and wave integrated system 140. The wave height meter is arranged in front of and behind the wind load device and the wind and wave integrated system 140.

[0089] The wind-wave integrated system 140 includes a floating wind turbine and a wave energy conversion device. The wind turbine includes a wind turbine 250, an aluminum profile frame 240, and a floating foundation. The floating foundation includes a float array consisting of six wave energy floats 230 and a lifting lug 210. The lifting lugs 210 are provided with at least three or more and are interconnected by the aluminum profile frame 240. The wind turbine 250 is installed on any of the lifting lugs 210. The wave energy float 230 is installed on the aluminum profile frame 240 through a vertical hinge constraint 280. No relative movement other than the vertical direction occurs between the wave energy float 230 and the aluminum profile frame 240.

[0090] It also includes a linear displacement sensor 220 probe installed on the aluminum profile frame 240, the linear displacement sensor 220, a hydraulic working cylinder 260 and a tension sensor 270. The wave energy float 230 is connected to the straight rod of the hydraulic working cylinder 260 through the tension sensor 270. The straight rod is connected to the piston of the hydraulic working cylinder 260. The pull rope of the linear displacement sensor 220 is connected to the wave energy float 230.

[0091] The wave energy conversion device includes a pipeline system 370, an energy conversion system load 380 and an energy storage cylinder 390. The hydraulic working cylinder 260 and the energy storage cylinder 390 are connected through the pipeline system 370. A one-way valve 360 and a three-way valve 410 are installed on the pipeline system 370. The outlet of the three-way valve 410 is connected to the inlet of the energy storage cylinder 390. It also includes a hydraulic box 430, which is provided with a hydraulic valve 420. The pipeline system 370 is connected to the hydraulic valve 420. The one-way valve 360 is installed between the hydraulic box 430 and the hydraulic working cylinder 260. The energy conversion system load 380 is located on the top of the energy storage cylinder 390 and includes a load insert 440, a load frame 450 and an energy storage cylinder 390 fixing frame. The energy storage cylinder 390 is fixed by the energy storage cylinder 390 fixing frame. A load rack 450 is installed above the energy storage cylinder 390, and a load insert 440 is installed on the load rack 450. When the piston in the hydraulic working cylinder 260 is driven upward by the wave energy float 230, the liquid in the upper half of the piston is squeezed through the one-way valve 360 and enters the energy storage cylinder 390, while the volume of the cavity under the piston expands, the pressure is reduced, and liquid is absorbed from the hydraulic tank 430 into the hydraulic working cylinder 260. When the wave energy float 230 drives the piston to move downward, the one-way valve 360 restricts the flow direction. The liquid neither flows from the hydraulic tank 430 into the hydraulic working cylinder 260 nor is pumped from the hydraulic working cylinder 260 into the energy storage cylinder 390. As the liquid level in the energy storage cylinder 390 rises, the load is also raised. At this time, the wave energy is converted into the potential energy of the load, realizing the conversion of wave energy.

[0092] A trailer 160 is provided on the bank of the swaying pool, and the trailer 160 is used to fix the data acquisition equipment.

[0093] The wave load device is a wave generator, and the wind load device is a wind generator 120.

[0094] The wind turbine 250 includes a power supply 470, a resistance controller 480, a monochrome display screen 490, a rotating connection node 510, a torque and speed sensor 520, an impeller 530 and an electric motor 540. The impeller 530 is connected to the electric motor 540 through the rotating connection node 510. The torque and speed sensor 520 and the electric motor 540 are connected to detect the torque of the electric motor 540. The electric motor 540 is connected to the power supply 470 and is powered by the power supply 470. The resistance controller 480 is connected to the connection circuit between the electric motor 540 and the power supply 470. The monochrome display screen 490 is connected to the resistance controller 480. The current in the circuit can be adjusted by the resistance controller 480.

[0095] The wave energy buoy 230 is further provided with a mounting device, the mounting device comprising a mounting seat and a mounting shaft, the mounting seat comprising a guide rod fixing seat 620, a vertical hinged bearing 570 and a bearing seat 580, the mounting shaft comprising a float guide rod 610, a top opening 560 being provided on the upper end surface of the wave energy buoy 230, the guide rod fixing seat 620 being fixed at the center of the wave energy buoy 230, the top opening 560 being located on both sides of the guide rod fixing seat 620, the float guide rod 610 being fixed in the guide rod fixing seat 620, a guide rod limiting hole 550 being provided on the guide rod fixing seat 620, the bearing seat 580 being mounted on the vertical hinged bearing 570, a bearing limiting hole 590 being provided on the bearing seat 580, the guide rod limiting hole 550 and the bearing limiting hole 590 being arranged in correspondence with each other in upper and lower directions, and the vertical cross bearing and the bearing seat 580 being respectively sleeved on the float guide rod 610 and fixed thereto.

[0096] The experimental device of the oscillating float integrated system based on the floating wind turbine proposed in the present invention includes a swaying pool, the water bank of the swaying pool is set as an energy dissipation bank 170, and an environmental load simulation system, a mooring system 190 and a wind and wave integrated system 140 are arranged in the swaying pool. The environmental load simulation system includes a wind load device for generating wind and a wave load device for generating waves. One end of the mooring system 190 is fixed to the bottom of the swaying pool, and the other end is connected to the wind and wave integrated system 140. The wind and wave integrated system 140 floats on the water surface of the swaying pool. The wind and wave integrated system 140 includes a floating foundation. The floating foundation is connected to the wind and wave integrated system 140 through the system. The mooring system 190 is constrained in the water pool. Therefore, under the action of wave loads and wind loads, the mooring system 190 can prevent the wind and wave integrated system 140 from moving significantly. Under the action of wave forces, the floating foundation moves in six degrees of freedom. The wave energy float 230 is fixed to the floating foundation through a vertical hinge constraint 280, and no relative movement other than the vertical direction occurs between the two. The wave energy float 230 is connected to the straight rod of the hydraulic working cylinder 260 through a tension sensor 270, and the straight rod is connected to the piston. According to this process, the wave energy float 230 drives the energy conversion system to realize the conversion of wave energy.

[0097] The center of gravity of the floating foundation can be adjusted, and the specifications of the sandbags used to adjust the center of gravity can be set to 3 or more to ensure sufficient adjustment accuracy.

[0098] The wind turbine 250 is fixed on a tower on a floating foundation. The impeller 530 is connected to the torque and speed sensor 520 and the motor 540. Different currents can cause the impeller 530 to rotate at different speeds. These parts are placed in the nacelle. Under the influence of the wind speed in the experimental environment, the impeller 530 of the wind turbine 250 maintains a stable speed through the speed control system, thereby simulating the aerodynamic load characteristics of the wind turbine 250.

[0099] The aluminum profile frame 240 includes a connecting beam, a cross beam, a vertical beam and a thin cross beam 350. Adjacent lifting ears 210 are connected by a connecting beam. The vertical beam is vertically fixed on the connecting beam. The cross beam and the thin cross beam 350 are respectively fixed on the vertical beam. The cross beam and the thin cross beam 350 are arranged in parallel with the connecting beam. The thin cross beam 350 and the cross beam are respectively provided with two groups. The connecting beam is provided with a cross beam limiting hole 290, and the vertical beam is installed therein and is limited by the cross beam limiting hole 290. The two groups of cross beams are respectively provided with an aluminum profile frame 240 limiting groove and a thin cross beam 350 positioning hole 340, which are divided into It is used to fix the vertical beam and the thin cross beam 350. The vertical beam is provided with a cross beam bolt hole 310 for fixing the cross beam. The aluminum profile frame 240 can be placed on the floating foundation through the bolt hole. It is also provided with a linear displacement sensor 220 probe installed on the aluminum profile frame 240, a linear displacement sensor 220, a hydraulic working cylinder 260 and a tension sensor 270. The wave energy float 230 is connected to the straight rod of the hydraulic working cylinder 260 through the tension sensor 270. The straight rod is connected to the piston of the hydraulic working cylinder 260. The pull rope of the linear displacement sensor 220 is connected to the wave energy float 230.

[0100] The wave energy conversion device includes a piping system 370, an energy conversion system load 380, and an energy storage cylinder 390. The hydraulic working cylinder 260 and the energy storage cylinder 390 are connected by the piping system 370. The outlet of the tee 410 is connected to the inlet of the energy storage cylinder 390. A hydraulic valve 420 is provided on the hydraulic box 430. The piping system 370 is connected to the hydraulic valve 420. The one-way valve 360 is installed between the hydraulic box 430 and the hydraulic working cylinder 260. The energy conversion system load 380 is located on the top of the energy storage cylinder 390 and includes a load insert 440, a load frame 450, and an energy storage cylinder 390 fixing frame. The load sheet is made of steel and its shape and thickness are designed according to the target quality.

[0101] The energy conversion process is as follows: when the piston in the hydraulic working cylinder 260 is driven upward by the wave energy float 230, the liquid in the upper half of the piston is squeezed through the one-way valve 360 and enters the energy storage cylinder 390, while the volume of the cavity under the piston expands, the pressure is reduced, and liquid is absorbed from the hydraulic tank 430 into the hydraulic working cylinder 260. When the wave energy float 230 drives the piston to move downward, the one-way valve 360 restricts the flow direction. The liquid neither flows from the hydraulic tank 430 into the hydraulic working cylinder 260 nor is pumped from the hydraulic working cylinder 260 into the energy storage cylinder 390. As the liquid level in the energy storage cylinder 390 rises, the load is also raised. At this time, the wave energy is converted into the potential energy of the load, realizing the conversion of wave energy.

[0102] The thermal anemometer is arranged between the wind load device and the physical model of the wind and wave integrated system 140. Two to three wave height meters are arranged between the wave maker 110 and the physical model, and two to three are arranged behind the physical model. The tension sensor 270 is arranged between the wave energy float 230 and the hydraulic cylinder 260. One end of the tension sensor 270 is connected to the bolt hole at the top of the float guide rod 610, and the other end is connected to the floating joint. One end of the tension sensor 270 is connected to the lifting lug 210 of the floating foundation through a shackle, and the other end is tied to the wire rope of the mooring system 190. The linear displacement sensor 220 has two arrangements. One method is to fix the linear displacement sensor 220 on a floating foundation, and screw the rope head of the linear displacement sensor 220 to the screw on the float; the other method is to fix the linear displacement sensor 220 on the energy storage steel fixing frame on the trailer 160, and screw the rope head of the linear displacement sensor 220 to the screw on the load frame 450. It also includes an optical six-degree-of-freedom instrument 150, which is fixed on the railing of the trailer 160. The probe of the linear displacement sensor 220 is arranged on the floating foundation. The above-mentioned sensor signal lines are all connected to the data acquisition instrument, and the data acquisition instrument processes the electrical signals and converts them into physical signals and stores them in the working condition control machine.

[0103] The motor 540 uses a 57 stepper motor, the resistance controller 480 is a sliding rheostat, the motor 540 and the sliding rheostat are connected by wires, the signal outlet of the motor 540 is connected to the monochrome display screen 490 by wires, and the sliding rheostat is connected to the power supply 470 for power supply.

[0104] The bottom of the energy dissipation bank 170 is filled with nylon material to absorb wave energy.

[0105] The experimental method of the oscillating float integrated system based on the floating wind turbine includes the following steps:

[0106] S1. Layout of the experimental site and the physical model of the wind-wave integrated system 140;

[0107] S2. Calibration of data test equipment and test environment;

[0108] S3, experimental testing and data collection;

[0109] S4. Post-processing of experimental data.

[0110] In step S1,

[0111] S11. Layout of the test site:

[0112] Adjust the wind turbine 120 and trailer 160 to the preset position. Arrange the physical model of the wind-wave integrated system 140 at a distance three times the wavelength from the wave generator 110. First, adjust the center of gravity of the floating foundation. Place prefabricated sandbags in the lifting lugs 210. Fine-tune the number of sandbags in each lifting lug 210 so that the waterline is level with the waterplane of the pool. Place the sandbags in the wave energy buoy 230. Once the wave energy buoy 230 is floating in the water and the waterline is level with the waterplane of the pool, fill the wave energy buoy 230 with foaming agent to secure the sandbags in place. Seal the top opening with waterproof tape. Arrange horizontal mooring lines with alternating longitude and latitude on the guide rails of the pool trailer 160. Determine the horizontal coordinates of the anchor block. Use a crane to drop an anchor at the intersection of the longitude and latitude mooring lines. Connect the other end of the fixed line of the mooring system 190 to the tension sensor 270, which is connected to the lifting lug 210 of the floating foundation via a shackle.

[0113] S12. Layout of the physical model of the wind and wave integrated system 140:

[0114] The physical experimental model of the wind-wave integrated system 140 was fixed to the aluminum profile frame 240 using angle brackets and T-bolts. The hydraulic cylinder 260 was fixed to the track of the aluminum profile frame 240 using T-bolts. Hydraulic cylinders 260 with different diameters and strokes were used to analyze the effect of hydraulic damping force on the coupled dynamics of the wind-wave integrated system 140. Before the experiment, the wave energy float 230 was manually moved to fill the wave energy conversion device with liquid. Different pipe diameters were selected for the piping system 370 to explore the effect of different hydraulic damping.

[0115] A thermal anemometer is arranged between the wind generator 120 and the physical model of the wind and wave integrated system 140. The thermal anemometer is fixed on a hanger. The signal line of the thermal anemometer is pulled to one side of the pool through the hanger and connected to the data acquisition system. A wave height meter is arranged between the wave generator 110 and the physical model of the wind and wave integrated system 140. At the same time, a wave height meter is also arranged behind the physical model of the wind and wave integrated system 140. The wave height meter located in front of the model is fixed on the hanger, and the wave height meter located at the rear is fixed on a rack suspended by the trailer 160. The signal lines are pulled to one side of the swaying pool and the trailer 160 respectively. The linear displacement sensor 220 and the tension sensor on the physical model of the wind and wave integrated system 140 The arrangement of the sensor 270 is the same as that of the linear displacement sensor 220 and the tension sensor 270. The linear displacement sensor 220 is arranged on the fixing frame of the energy storage cylinder 390, and the probe of the linear displacement sensor 220 is fixed on the load frame 450. The non-contact six-degree-of-freedom instrument consists of a motion capture system consisting of three cameras and target detection points. The cameras are arranged on the railings of the trailer 160, and the detection points are arranged on the physical model of the wind and wave integrated system 140. The cameras are arranged in a triangular shape, and the capture range can reach both sides of the pool on the left and right, and the wave maker 110 in the front. The detection points are arranged in a triangular shape on the barrel cover of the floating foundation or on the nacelle of the wind turbine 250.

[0116] In step S2, before the experiment begins, the data testing equipment needs to be calibrated, including the calibration of the wave height meter, the linear displacement sensor 220, the tension sensor 270, the tension sensor 270, and the optical six-degree-of-freedom instrument 150;

[0117] S21. Calibration of data test equipment:

[0118] Calibrate the wave height meter: First, prepare the standard liquid and the standard liquid level reference. When the wave height meter is placed in the standard liquid, start the device and calibrate according to the instructions, including setting the zero point and the maximum liquid level value, recording the wave height meter display value and the actual liquid level at different liquid levels for subsequent calibration and correction. Use the recorded data to analyze the measurement accuracy of the wave height meter and make calibration adjustments. After confirming that the measurement results after calibration and adjustment meet the expectations, the wave height meter can be confirmed to have completed calibration.

[0119] Calibrate the linear displacement sensor 220: Use a vernier caliper to mark reference lines at different intervals on the pull cord of the linear displacement sensor 220. Pull the cord to reveal different reference lines. Record the numerical value and actual position data displayed by the linear displacement sensor 220 for subsequent analysis and calibration adjustments. Evaluate the measurement accuracy of the linear displacement sensor 220 by analyzing the data and make necessary calibration adjustments. Finally, retest the linear displacement sensor 220 to confirm whether the measurement results after calibration and adjustment meet expectations, thereby completing the calibration of the linear displacement sensor 220.

[0120] Calibrate the tension sensor 270 and the tension sensor 270: With the help of a standard force measuring instrument and a force reference object, connect the force reference object to the tension sensor 270 and apply a standard tension to ensure that the direction of the tension is consistent with the measurement direction of the tension sensor 270. Under different tensions, record the value displayed by the tension sensor 270 and the actual tension applied. These data will be used for subsequent calibration and correction;

[0121] Calibrate the optical 6DOF instrument 150: Place the calibration plate within the measurement range of the optical 6DOF instrument 150, ensuring complete coverage. Start the optical 6DOF instrument 150 and perform calibration according to the device instructions, including zero point and range calibration. Record the values displayed and actual position data of the optical 6DOF instrument 150 at different positions and angles for subsequent analysis and calibration adjustments. Use the recorded data to evaluate the measurement accuracy of the optical 6DOF instrument 150 and make necessary calibration adjustments.

[0122] S22. Calibration of test environment:

[0123] The wind-generating and wave-generating capabilities of the experimental site need to be calibrated at the model location. Wind speed and wave height are collected using measuring instruments. The generated and subtracted parts before and after the collection time are removed during data analysis. The simulation of the environment is analyzed by calculating the average wind speed, regular wave height, and irregular wave spectrum. The degree of wind load simulation can be evaluated by comparing the average test wind speed with the target wind speed value. The degree of wave simulation can be evaluated by comparing the average test regular wave height with the target value and the test irregular wave spectrum with the target spectrum.

[0124] In step S3, before the experiment officially begins, first ensure that the water surface in the pool is calm enough. The interval between each set of experimental conditions should be more than 20 minutes. For irregular wave experiments, the interval should be more than 35 minutes.

[0125] During the formal experiment, the wind turbine 120 is started first, and then the "wind turbine 250 control" system is started, and the speed of the impeller 530 is gradually increased to the target value. Then, each signal sensor is started to ensure that the sensor is in normal working condition. Then the wave generator 110 is started to monitor and record the incident wave height, incoming wind speed, six-degree-of-freedom motion of the wind and wave integration system 140, the motion response of the wave energy float 230, the thrust of the float on the energy conversion system, the lifting speed of the energy storage cylinder 390 load, and the tension of the mooring system 190. The sensor data is monitored in real time. When an abnormal situation occurs, the experiment is stopped and checked. After the experiment is completed, the measured data is saved.

[0126] In step S4, after the experiment is completed, the data is classified and stored, and data processing is carried out, including spectral analysis of the waves and exploration of the frequency domain characteristics of the waves under the influence of floating body diffraction waves and radiation waves.

[0127] The displacement and output data of the wave energy float 230 in the wind and wave integrated system 140 are collected, and the hydrodynamic power characteristics of the wave energy device are obtained by referring to formula (3). Based on the lifting rate of the load of the energy storage cylinder 390, the overall power characteristics of the hydraulic system can be analyzed by referring to formula (4), and the secondary conversion efficiency of the wave energy device is explored.

[0128]

[0129]

[0130] where represents the hydrodynamic power of the wave energy device, represents the overall power of the wave energy device, m is the mass of the load, V is the speed at which the load is lifted, FPTO is the force exerted by the wave energy float 230 on the energy conversion system,

[0131] The motion characteristics of the wind-wave integrated system 140 are analyzed based on six-degree-of-freedom data. The dynamic impact of the integrated wave energy device on the wind turbine 250 is explored. The frequency domain analysis of the motion response time domain curve is performed to explore the coupling mechanism of the motion response of the wind-wave integrated system 140. Combined with the data from the tension sensor 270, the coupling relationship between the motion response and the mooring tension is analyzed to explore the hydrodynamic performance characteristics of the wind-wave integrated system 140.

[0132] Based on the torque speed sensor 520 in the physical model of the wind-wave integrated system 140, the torque variation characteristics of the wind turbine 250 at different wind speeds are analyzed. Combined with the sensor speed value, the power output characteristics of the wind turbine 250 are analyzed, and the overall power output performance of the wind turbine 250 is explored.

[0133] 1. Analysis of the integrated hydrodynamic characteristics of wave energy devices and floating wind turbines:

[0134] The system described in this application allows researchers to analyze the hydrodynamic characteristics of integrated wave energy devices and floating wind turbines. By integrating the two energy sources, researchers can assess their interaction in complex water environments, thereby better understanding the performance of the overall system.

[0135] 2. Realize the relative motion of the array of model wave energy floats 230 on the floating foundation:

[0136] The experimental setup and methods of this application allow researchers to simulate and observe the relative motion of an array of model wave energy floats 230 on a floating foundation. This is crucial for designing and optimizing wave energy conversion systems because it allows for a better understanding of the interaction between the floats and the waves.

[0137] 3. Realize the power characteristic analysis of wind turbine 250 and wave energy device:

[0138] The system of this application can be used to analyze the power characteristics of wind turbine 250 and wave energy devices. Such comprehensive analysis helps determine the energy output of the system under different environmental conditions, thus providing an important reference for practical engineering applications.

[0139] 4. Using hydraulic system to consider nonlinear energy conversion system characteristics:

[0140] The experimental apparatus and method of this application utilizes a hydraulic system to account for the nonlinear characteristics of the energy conversion system. This method can more accurately simulate and evaluate the nonlinear characteristics present in actual systems, facilitating more precise predictions of energy conversion efficiency and system response.

[0141] 5. The speed of wind turbine 250 is continuously adjustable:

[0142] The experimental device in this application can achieve purposeful and continuous adjustment of the speed of the wind turbine 250 impeller 530 through the wind turbine 250 speed control system, match the incoming wind speed, and simulate an integrated system under any tip speed ratio.

[0143] The above description is merely a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent variation based on the technical essence of the present invention shall still fall within the scope of protection claimed by the present invention.

Claims

1. Experimental device for oscillating float integrated system based on floating wind turbine, characterized by: The invention comprises a swaying pool, wherein the water bank of the swaying pool is set as an energy dissipation bank (170), and an environmental load simulation system, a mooring system (190) and a wind-wave integration system (140) are arranged in the swaying pool. The environmental load simulation system comprises a wind load device for generating wind and a wave load device for generating waves. One end of the mooring system (190) is fixed to the bottom of the swaying pool, and the other end is connected to the wind-wave integration system (140). The wind-wave integration system (140) floats on the water surface of the swaying pool. After obtaining the specific wind speed through the wind load device, the wind speed is adjusted to the input parameter of the wind load device according to formula (1). The wind direction is achieved by adjusting the angle between the wind load device and the wind-wave integration system (140). The turbulence degree of the wind speed is adjusted by adjusting the distance between the wind load device and the wind-wave integration system (140). (1) Among them, y1 is the target wind speed, x1 is the load factor, After obtaining the specific wave height and period through the wave load device, they are converted into the input parameters of the wave load device according to formula (2). (2) Where y is the wave load device transfer coefficient, x is the wave period, A data acquisition device is also provided on the water surface of the swaying pool. The data acquisition device includes a thermal anemometer and a wave height meter. The thermal anemometer is arranged between the wind load device and the wind and wave integrated system (140). The wave height meter is arranged in front of and behind the wind load device and the wind and wave integrated system (140). The wind-wave integrated system (140) includes a floating wind turbine and a wave energy conversion device. The wind turbine includes a wind turbine group (250), an aluminum profile frame (240), and a floating foundation. The floating foundation includes a float array consisting of six wave energy floats (230) and a lifting lug (210). The lifting lugs (210) are provided with at least three or more and are interconnected through the aluminum profile frame (240). The wind turbine group (250) is installed on any of the lifting lugs (210). The wave energy float (230) is installed on the aluminum profile frame (240) through a vertical hinge constraint (280). No relative movement other than in the vertical direction is generated between the wave energy float (230) and the aluminum profile frame (240). The invention also includes a linear displacement sensor (220) probe mounted on the aluminum profile frame (240), the linear displacement sensor (220), a hydraulic working cylinder (260), and a tension sensor (270); the wave energy float (230) is connected to a straight rod of the hydraulic working cylinder (260) via the tension sensor (270); the straight rod is connected to a piston of the hydraulic working cylinder (260); the pull rope of the linear displacement sensor (220) is connected to the wave energy float (230); The wave energy conversion device comprises a pipeline system (370), an energy conversion system load (380) and an energy storage cylinder (390). The hydraulic working cylinder (260) and the energy storage cylinder (390) are connected via the pipeline system (370). A one-way valve (360) and a three-way valve (410) are installed on the pipeline system (370). The outlet of the three-way valve (410) is connected to the inlet of the energy storage cylinder (390). The wave energy conversion device also comprises a hydraulic box (430). The hydraulic The box (430) is provided with a hydraulic valve (420), the pipeline system (370) is connected to the hydraulic valve (420), the one-way valve (360) is installed between the hydraulic box (430) and the hydraulic working cylinder (260), the energy conversion system load (380) is located on the top of the accumulator cylinder (390), and includes a load insert (440), a load frame (450) and an accumulator cylinder (390) fixing frame, and the accumulator cylinder (390) is connected to the accumulator cylinder (390) by the accumulator cylinder (390). 90) fixing frame is used for fixing, a load frame (450) is installed above the energy storage cylinder (390), and a load insert (440) is installed on the load frame (450). When the piston in the hydraulic working cylinder (260) is driven by the wave energy float (230) to move upward, the liquid in the upper half of the piston is squeezed through the one-way valve (360) and enters the energy storage cylinder (390), while the volume of the cavity under the piston expands, the pressure is reduced, and the liquid is absorbed from the hydraulic box (430). The liquid enters the hydraulic working cylinder (260). When the wave energy float (230) drives the piston to move downward, the one-way valve (360) restricts the flow direction. The liquid neither flows from the hydraulic box (430) into the hydraulic working cylinder (260) nor is pumped from the hydraulic working cylinder (260) into the energy storage cylinder (390). As the liquid level in the energy storage cylinder (390) rises, the load is also raised. At this time, the wave energy is converted into the potential energy of the load, realizing the conversion of wave energy.

2. The experimental device for an oscillating float integrated system based on a floating wind turbine according to claim 1 is characterized in that: A trailer (160) is provided on the bank of the swaying pool, and the trailer (160) is used to fix data acquisition equipment.

3. The experimental device for an oscillating float integrated system based on a floating wind turbine according to claim 1 is characterized in that: The wave load device is a wave maker, and the wind load device is a wind maker (120).

4. The experimental device for an oscillating float integrated system based on a floating wind turbine according to claim 1 is characterized in that: The wind turbine generator set (250) comprises a power supply (470), a resistance controller (480), a monochrome display screen (490), a rotating connection node (510), a torque and speed sensor (520), an impeller (530), and a motor (540). The impeller (530) is connected to the motor (540) via the rotating connection node (510). The torque and speed sensor (520) is connected to the motor (540) for detecting the torque of the motor (540). The motor (540) is connected to the power supply (470) and is powered by the power supply (470). The resistance controller (480) is connected to the connection circuit between the motor (540) and the power supply (470). The monochrome display screen (490) is connected to the resistance controller (480). The current in the circuit can be adjusted by the resistance controller (480).

5. The experimental device for an oscillating float integrated system based on a floating wind turbine according to claim 1 is characterized in that: The invention also includes a mounting device for mounting the wave energy float (230), the mounting device including a mounting seat and a mounting shaft, the mounting seat including a guide rod fixing seat (620), a vertical hinged bearing (570) and a bearing seat (580), the mounting shaft including a float guide rod (610), a top opening (560) being provided on the upper end surface of the wave energy float (230), the guide rod fixing seat (620) being fixed at the center of the wave energy float (230), the top opening (560) being respectively located at the guide rod fixing seat (620) and the top opening (560). 0), the float guide rod (610) is fixed in the guide rod fixing seat (620), the guide rod limiting hole (550) is opened on the guide rod fixing seat (620), the bearing seat (580) is installed on the vertical hinge bearing (570), the bearing seat (580) is opened with a bearing limiting hole (590), the guide rod limiting hole (550) and the bearing limiting hole (590) are arranged correspondingly in the upper and lower parts, and the vertical intersection bearing and the bearing seat (580) are respectively sleeved on the float guide rod (610) and fixed thereon.

6. The experimental method of the experimental device for the oscillating float integrated system based on a floating wind turbine according to any one of claims 1 to 5, characterized in that: The steps include: S1. Layout of the experimental site and the physical model of the wind-wave integrated system (140); S2. Calibration of data test equipment and test environment; S3, experimental testing and data collection; S4. Post-processing of experimental data.

7. The experimental method of the oscillating float integrated system experimental device based on the floating wind turbine according to claim 6 is characterized in that: In step S1, S11. Layout of the test site: The wind generator (120) and the trailer (160) are adjusted to a preset position, and a physical model of the wind and wave integrated system (140) is arranged at a position three times the wavelength away from the wave generator (110). First, the center of gravity of the floating foundation is adjusted, and pre-made sandbags are placed in the lugs (210). The number of sandbags in each lug (210) is fine-tuned so that the waterline is level with the waterline of the pool. The sandbags are placed in the wave energy float (230). When the wave energy float (230) can float in the water and the waterline is level with the waterline, the wave energy float (230) is placed in the water. When the waterline of the pool is level, a wave energy float (230) filled with a foaming agent is used to fix the position of the sandbag, and the top opening is sealed with a waterproof tape. A horizontal mooring line with a longitude and latitude staggered is arranged on the guide rail of the pool trailer (160), and the horizontal coordinate of the anchor block is determined. An anchor is lowered along the intersection of the longitude and latitude mooring lines using a crane, and the other end of the fixed line of the mooring system (190) is connected to the tension sensor (270), and the tension sensor (270) is connected to the lifting lug (210) of the floating foundation through a shackle; S12. Arrangement of the physical model of the wind and wave integrated system (140): The wind-wave integrated system (140) physical experimental model is fixed to the aluminum profile frame (240) by angle brackets and T-bolts. The hydraulic working cylinder (260) is fixed to the track of the aluminum profile frame (240) by T-bolts. The hydraulic working cylinder (260) is selected with cylinder bodies of different diameters and different strokes to analyze the influence of hydraulic damping force on the coupled dynamics of the wind-wave integrated system (140). Before the experiment, the wave energy float (230) is manually moved to fill the wave energy conversion device with liquid. Different pipe diameters are selected for the pipeline system (370) to explore the influence of different hydraulic damping. A thermal anemometer is arranged between the wind generator (120) and the physical model of the wind and wave integrated system (140). The thermal anemometer is fixed on a hanger. The signal line of the thermal anemometer is pulled to one side of the pool through the hanger and connected to the data acquisition system. A wave height meter is arranged between the wave generator (110) and the physical model of the wind and wave integrated system (140). At the same time, a wave height meter is also arranged behind the physical model of the wind and wave integrated system (140). The wave height meter located in front of the model is fixed on the hanger, and the wave height meter located at the rear is fixed on a rack suspended by the trailer (160). The signal lines are pulled to one side of the swaying pool and the trailer (160) respectively. The linear displacement sensor (220) and the tension sensor ( The arrangement of the linear displacement sensor (220) and the tension sensor (270) is the same as that of the linear displacement sensor (220) and the tension sensor (270). The linear displacement sensor (220) is arranged on the fixed frame of the energy storage cylinder (390). The probe of the linear displacement sensor (220) is fixed on the load frame (450). The non-contact six-degree-of-freedom instrument is composed of a motion capture system composed of three cameras and a target detection point. The cameras are arranged on the railing of the trailer (160). The detection points are arranged on the physical model of the wind and wave integrated system (140). The cameras are arranged in a triangular shape. The capture range can reach both sides of the pool and the front can reach the wave maker (110). The detection points are arranged in a triangular shape on the barrel cover of the floating foundation or on the nacelle of the wind turbine (250).

8. The experimental method of the oscillating float integrated system experimental device based on the floating wind turbine according to claim 6 is characterized by: In step S2, before the experiment begins, the data testing equipment needs to be calibrated, including the calibration of the wave height meter, the linear displacement sensor (220), the tension sensor (270), the tension sensor (270) and the optical six-degree-of-freedom instrument (150); S21. Calibration of data test equipment: Calibrate the wave height meter: First, prepare the standard liquid and the standard liquid level reference. When the wave height meter is placed in the standard liquid, start the device and calibrate according to the instructions, including setting the zero point and the maximum liquid level value, recording the wave height meter display value and the actual liquid level at different liquid levels for subsequent calibration and correction. Use the recorded data to analyze the measurement accuracy of the wave height meter and make calibration adjustments. After confirming that the measurement results after calibration and adjustment meet the expectations, the wave height meter can be confirmed to have completed calibration. Calibrate the linear displacement sensor (220): mark reference lines at different intervals on the pull rope of the linear displacement sensor (220) with a vernier caliper, reveal different reference lines by pulling the pull rope, record the numerical value and actual position data displayed by the linear displacement sensor (220) for subsequent analysis and calibration adjustment, evaluate the measurement accuracy of the linear displacement sensor (220) by analyzing the data, and make necessary calibration adjustments. Finally, retest the linear displacement sensor (220) to confirm whether the measurement results after calibration adjustment meet expectations, thereby completing the calibration of the linear displacement sensor (220); Calibrate the tension sensor (270) and the tension sensor (270): with the help of a standard force measuring instrument and a force measuring reference object, connect the force measuring reference object to the tension sensor (270), and apply a standard tension to ensure that the direction of the tension is consistent with the measurement direction of the tension sensor (270). Under different tensions, record the value displayed by the tension sensor (270) and the actual applied tension, and these data will be used for subsequent calibration and correction; Calibrate the optical six-degree-of-freedom instrument (150): place the calibration plate within the measurement range of the optical six-degree-of-freedom instrument (150) to ensure complete coverage, start the optical six-degree-of-freedom instrument (150) and calibrate it according to the device instructions, including zero point and range calibration, record the numerical values and actual position data displayed by the optical six-degree-of-freedom instrument (150) at different positions and angles for subsequent analysis and calibration adjustment, use the recorded data to evaluate the measurement accuracy of the optical six-degree-of-freedom instrument (150), and make necessary calibration adjustments; S22. Calibration of test environment: The wind-generating and wave-generating capabilities of the experimental site need to be calibrated at the model location. Wind speed and wave height are collected using measuring instruments. The generated and subtracted parts before and after the collection time are removed during data analysis. The simulation of the environment is analyzed by calculating the average wind speed, regular wave height, and irregular wave spectrum. The degree of wind load simulation can be evaluated by comparing the average test wind speed with the target wind speed value. The degree of wave simulation can be evaluated by comparing the average test regular wave height with the target value and the test irregular wave spectrum with the target spectrum.

9. The experimental method of the experimental device for the oscillating float integrated system of the floating wind turbine according to claim 6 is characterized in that: In step S3, before the experiment officially begins, first ensure that the water surface in the pool is calm enough. The interval between each set of experimental conditions should be more than 20 minutes. For irregular wave experiments, the interval should be more than 35 minutes. During the formal experiment, the wind generator (120) is first started, and then the "wind turbine (250) control" system is started, and the impeller (530) speed is gradually increased to the target value. Then, each signal sensor is started to ensure that the sensor is in normal working condition. Then, the wave generator (110) is started to monitor and record the incident wave height, incoming wind speed, six-degree-of-freedom motion of the wind and wave integration system (140), the motion response of the wave energy float (230), the thrust of the float on the energy conversion system, the lifting speed of the energy storage cylinder (390) load, and the pulling force of the mooring system (190). The sensor data is monitored in real time. When an abnormal situation occurs, the experiment is stopped and checked. After the experiment is completed, the measured data is saved.

10. The experimental method of the experimental device for the oscillating float integrated system based on the floating wind turbine according to claim 6, characterized in that: In step S4, after the experiment is completed, the data is classified and stored, and data processing is carried out, including spectral analysis of the waves and exploration of the frequency domain characteristics of the waves under the influence of floating body diffraction waves and radiation waves. The displacement and output data of the wave energy float (230) in the wind and wave integrated system (140) are collected, and the hydrodynamic power characteristics of the wave energy device are obtained by referring to formula (3). Based on the lifting rate of the load of the energy storage cylinder (390), the overall power characteristics of the hydraulic system can be analyzed by referring to formula (4), and the secondary conversion efficiency of the wave energy device is explored. (3) (4) in, represents the hydrodynamic power of the wave energy device, represents the overall power of the wave energy device, m is the mass of the load, V is the speed at which the load is lifted, and F PTO is the force exerted by the wave energy buoy (230) on the energy conversion system, The motion characteristics of the wind-wave integrated system (140) are analyzed based on six-degree-of-freedom data, the dynamic influence of the integrated wave energy device on the wind turbine (250) is explored, the motion response time domain curve is analyzed in the frequency domain, the coupling mechanism of the motion response of the wind-wave integrated system (140) is explored, and the coupling relationship between the motion response and the mooring tension is analyzed in combination with the data of the tension sensor (270), and the hydrodynamic performance characteristics of the wind-wave integrated system (140) are explored. Based on the torque speed sensor (520) in the physical model of the wind-wave integrated system (140), the torque variation characteristics of the wind turbine (250) at different wind speeds are analyzed, and combined with the sensor speed value, the power output characteristics of the wind turbine (250) are analyzed to explore the overall power output performance of the wind turbine (250).

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