Multi-degree-of-freedom combined ocean energy power generation device self-adaptive to sea conditions and control method

Abstract

The invention belongs to the technical field of ocean renewable energy sources, and particularly relates to a multi-degree-of-freedom combined ocean energy power generation device self-adaptive to sea conditions and a control method. The wave energy input mechanism and the reversing mechanism are installed on the driving shaft, the electric energy conversion end mechanism is installed on the driven shaft, and the wave energy input mechanism inputs one-way rotation to the electric energy conversion end mechanism under the action of the reversing mechanism; the gear ratio self-adjusting system is arranged in the floating body seat, gear ratios of all gear sets are different, the driving wheel is installed on the driving shaft through a bearing, an inner groove is formed in the driving wheel, and the driven wheel is fixedly installed on the driven shaft; the controllable plug pin device is fixedly installed in the driving shaft and controls the plug pin to stretch into or retreat from the inner groove, and the gear set is switched to adapt to different sea conditions. According to the invention, by changing the gear ratio, the resistance during the motion of the pendulum bob is changed, so that the motion of the pendulum bob and the motion of the floating body achieve resonance, the wave energy under different sea conditions can be more effectively utilized, and the utilization efficiency of the wave energy is obviously improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of marine renewable energy, and particularly relates to a multi-degree-of-freedom combined marine energy power generation device and a control method for self-adapting to sea conditions. BACKGROUND

[0002] The marine energy power generation device is a device for converting marine wave energy into electric energy, and is mainly applied to the development of renewable energy on the coast or at sea. The core principle is to drive air compression or mechanical transmission to generate electricity through wave motion. The structural design includes floating type, fixed type and modular device. For example, the C4 floating ball of Sweden drives the gear to generate electricity through up-down motion, the European sea snake device generates electricity by combining the floating cylinder and the hydraulic piston, and the Chinese "Huqing" pneumatic device uses a hydraulic system to adapt to wide frequency waves. Some patented devices collect wave energy in the transverse / longitudinal direction, combine modular arrangement to improve power generation efficiency, and are suitable for offshore platforms, fishing ports and island power supply.

[0003] The technical bottleneck of the current marine energy power generation device in application is poor stability of electric energy output under irregular wave conditions. Further analysis of the reasons: first, the sea condition adaptability is insufficient. The traditional device adopts fixed gear ratio design, which is difficult to balance low torque high efficiency transmission under calm sea conditions and overload protection under severe sea conditions, resulting in limited power generation efficiency under all sea conditions. Second, the multi-degree-of-freedom device structure is complex, and the reversing mechanism is low in efficiency. The commonly used planar gear set or ratchet pawl structure has poor adaptability to the space bidirectional swing of eccentric pendulum to unidirectional rotation, which is easy to produce mechanical loss and jamming. Third, the output stability is poor. Single electric control speed stabilization or inertia flywheel design is difficult to offset the speed change caused by random wave fluctuation, which makes it difficult to meet the continuous and stable demand of island power supply, marine monitoring and other scenes. Fourth, the single energy dependence is strong, and there is a lack of deep complementary mechanism with wind energy and solar energy. The power supply is interrupted on cloudy days or in the absence of wind. SUMMARY

[0004] In order to solve the problems in the prior art, the application provides a multi-degree-of-freedom combined marine energy power generation device and a control method for self-adapting to sea conditions, which can generate stable power and is not limited by weather.

[0005] The technical solution adopted by the application to solve the technical problems is as follows: the multi-degree-of-freedom combined marine energy power generation device for self-adapting to sea conditions comprises: a floating body seat in the form of a closed hemisphere; a driving shaft and a driven shaft installed in the floating body seat in the vertical direction; The wave energy power generation device is arranged in a floating body seat and comprises a wave energy input mechanism, a reversing mechanism and an electric energy conversion end mechanism. The wave energy input mechanism and the reversing mechanism are arranged on a driving shaft, and the electric energy conversion end mechanism is arranged on a driven shaft. The wave energy input mechanism inputs unidirectional rotation to the electric energy conversion end mechanism under the action of the reversing mechanism. The self-adjusting gear ratio system is arranged in the floating body seat and comprises variable gear sets. Each gear set is provided with a driving wheel and a driven wheel which are engaged. The gear ratio between each gear set is different. The driving wheel of each set is arranged on the driving shaft through a bearing, and an inner groove is formed in each driving wheel. The driven wheel of each set is fixedly arranged on the driven shaft. The torque sensor is arranged on the driving shaft. The controllable latch device is fixedly arranged in the driving shaft. The controllable latch device is provided with a latch which cooperates with the inner groove. The controllable latch device controls the latch to extend into or exit the inner groove according to the torque measured by the torque sensor, so as to switch the gear set to adapt to different sea conditions.

[0006] Preferably, the tail end of the latch is provided with a key. The controllable latch device further comprises a steering engine, a guide rail wheel and a guide groove platform. The guide rail wheel is located above the guide groove platform, and the steering engine is located below the guide groove platform. The guide rail wheel is arranged on the output end of the steering engine. The guide groove platform is provided with a groove for arranging the latch. The guide rail wheel is provided with an arc-shaped guide groove for guiding the extension or exit of the latch. One end of the arc-shaped guide groove is close to the center of the guide rail wheel, and the other end is away from the center. The key is arranged in cooperation with the arc-shaped guide groove.

[0007] Preferably, the arc-shaped guide grooves are centrally symmetrically distributed on the plane of the guide rail wheel.

[0008] Preferably, the driving wheels of each gear set are respectively provided with controllable latch devices.

[0009] Preferably, the variable gear set is provided with three gear sets. The gear number ratios of the three gear sets are 0.513, 1 and 1.318, which correspond to calm, normal and severe sea conditions in sequence.

[0010] Preferably, the controllable latch device is uniformly provided with four latches in the circumferential direction.

[0011] Preferably, the reversing mechanism comprises a first vertical straight bevel gear and a second vertical straight bevel gear, and a horizontal third straight bevel gear. The first straight bevel gear is connected with the driving shaft through a first one-way bearing. The second straight bevel gear is connected with the driving shaft through a second one-way bearing. The directions of the first one-way bearing and the second one-way bearing are the same. The third straight bevel gear is in meshing transmission with the first straight bevel gear and the second straight bevel gear. The wave energy input mechanism comprises an adjustable load and a horizontal eccentric pendulum; the horizontal eccentric pendulum is fixed with a first straight bevel gear, and the end of the swing arm of the horizontal eccentric pendulum is provided with the adjustable load; The electric energy conversion end mechanism comprises an inertial flywheel and a generator; the input shaft of the generator is fixed with the inertial flywheel; and the inertial flywheel is connected with the driven shaft through a one-way bearing.

[0012] Preferably, the top of the floating body seat is welded with a conical steel frame, the conical steel frame is internally provided with a spiral wind turbine, the fan blades of the spiral wind turbine are arranged along a vertical shaft, and the conical steel frame is externally provided with a photovoltaic panel.

[0013] A control method for controlling the adaptive sea state multi-degree-of-freedom combined ocean energy power generation device comprises the following steps: S1, anchoring the device on the sea surface, the wave-driven floating body seat rolls, and the wave energy input mechanism inputs one-way rotation to the electric energy conversion end mechanism under the action of the reversing mechanism; S2, the torque sensor detects the torque at the wave energy input mechanism in real time, selects the gear set according to the preset threshold, drives the controllable bolt device to control the bolt to extend into or exit the inner groove, and switches the gear set to adapt to different sea states; S3, the driving shaft drives the driven shaft through the selected gear set, and the electric energy conversion end mechanism absorbs the speed fluctuation and outputs stable electric energy.

[0014] Preferably, the wind power generation and photovoltaic power generation complementary to the wave power generation are further included, the wind power generation and photovoltaic power generation are connected with the power supply system of the floating body, and are used for supplying power to the control module and the energy storage device.

[0015] Compared with the prior art, the present application has the following advantages: 1. The eccentric pendulum type wave energy power generation device can capture the multi-degree-of-freedom motion of the device under the action of waves and convert it into horizontal rotation of the eccentric pendulum around the driving shaft. Waves in actual sea areas are mostly random waves, and the motion of the device is extremely irregular. The traditional vertical pendulum type wave energy device can only absorb waves in one direction and the motion amplitude of the pendulum is limited. The horizontal eccentric pendulum can capture the energy of waves in different wave directions to the maximum extent.

[0016] 2. The self-adjusting gear ratio system can monitor the torque in real time through the torque sensor of the automatic control system according to different sea states, select and control the controllable bolt device driven by the steering engine in the driving shaft to extend or retract, thereby automatically adjusting the gear ratio of the working gear set on the driving shaft and the transmission shaft, changing the resistance of the pendulum motion, and making the pendulum motion and the floating body motion resonate, so that the wave energy in different sea states can be more effectively utilized, and the wave energy utilization efficiency is significantly improved.

[0017] 3. The inertial flywheel speed stabilizing mechanism is connected to the driven shaft through a one-way bearing, and smooths the speed fluctuation through a large inertia flywheel, ensuring smooth output of the generator and significantly improving the power generation stability of the wave energy device.

[0018] 4. The photovoltaic panel and the spiral wind turbine can utilize light energy and wind energy to provide power for the control system of the floating body, and store excess electric energy. The spiral wind turbine utilizes the narrow tube effect in the conical steel frame to enhance wind energy capture, and the photovoltaic panel and the spiral wind turbine are complementary to the wave energy for power supply. Meanwhile, the presence of the wave energy device in the floating body can avoid the situation that no energy can be obtained in overcast or windless weather, and the three achieve combined power generation, and the overall energy acquisition of the device is more stable.

[0019] In summary, the application provides a multi-degree-of-freedom combined ocean energy power generation device and a control method which can adapt to sea conditions, generate stable power, and are not limited by weather. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a schematic view of the power generation device disclosed in embodiment 1 of the application cutting the floating body shell.

[0021] Figure 2 is a schematic view of the internal structure of the floating body shell disclosed in embodiment 1 of the application.

[0022] Figure 3 is a vertical direction sectional view of the reversing mechanism disclosed in embodiment 1 of the application.

[0023] Figure 4 is a vertical direction sectional view of the self-adjusting gear ratio system disclosed in embodiment 1 of the application.

[0024] Figure 5 is an upper isometric view of the controllable bolt device disclosed in embodiment 1 of the application.

[0025] Figure 6 is a longitudinal sectional view of the self-adjusting gear ratio system disclosed in embodiment 1 of the application.

[0026] Figure 7 is a graph of instantaneous power generation under calm sea conditions.

[0027] Figure 8 is a graph of instantaneous power generation under normal sea conditions.

[0028] Figure 9 is a graph of instantaneous power generation under severe sea conditions.

[0029] In the figure: 101, photovoltaic panel; 102, fan blade; 103, conical steel frame; 104, wind turbine; 105, floating body shell; 201. Lower base; 202. Gear frame; 203. Drive shaft; 204. Driven shaft; 205. Inertia flywheel; 206. Generator; 207. Torque sensor; 208. Reversing mechanism; 209. Horizontal eccentric pendulum; 210. Adjustable load. 301. First bevel gear; 302. Second bevel gear; 303. Third bevel gear; 304. Bearing; 305. Gearbox; 308. Inner groove; 401. First driving gear; 402. Second driving gear; 403. Third driving gear; 404. First driven gear; 405. Second driven gear; 406. Third driven gear; 407. Controllable pin device; 501. Servo motor; 502. Guide wheel; 503. Pin; 504. Guide groove platform; 505. Protruding key; 506. Arc-shaped guide groove. Detailed Implementation

[0030] To facilitate understanding of the present invention, it will be described in more detail below with reference to the accompanying drawings and specific embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described in this specification. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of the present invention.

[0031] Example 1: As Figures 1-6 As shown, an adaptive sea state multi-degree-of-freedom combined marine energy power generation device is disclosed. The device includes a hemispherical floating shell 105, which is made of corrosion-resistant metal. An eccentric pendulum wave energy power generation system is installed inside the floating shell 105, and wind power generation and photovoltaic power generation are installed on the outside.

[0032] The eccentric pendulum wave energy power generation system comprises a horizontal eccentric pendulum 209, a reversing mechanism 208, a torque sensor 207, a self-adjusting gear ratio transmission mechanism, an inertial flywheel 205 and a generator 206. A horizontal lower base 201 is installed at the bottom of the floating body shell 105, a gear frame 202 is installed on the lower base 201, a driving shaft 203 and a driven shaft 204 are installed between the gear frame 202 and the lower base 201 in the vertical direction, and the inertial flywheel 205 and the generator 206 are installed on the gear frame 202 in the vertical direction. The input shaft of the generator 206 is fixedly connected with the inertial flywheel 205, the inertial flywheel 205 is connected with the driven shaft 204 through a one-way bearing, and the rotation of the inertial flywheel 205 drives the generator 206 to generate electricity. The top end of the driving shaft 203 penetrates through the gear frame 202 and extends to the top of the gear frame 202, and is connected with the reversing mechanism 208 through the torque sensor 207; the reversing mechanism 208 is installed on the top of the gear frame 202, and the horizontal eccentric pendulum 209 is installed on the top of the reversing mechanism 208 in the horizontal direction, and an adjustable load 210 is arranged at the end of the pendulum arm. When the floating body is rolled by waves, the horizontal eccentric pendulum 209 swings bidirectionally (clockwise and counterclockwise), but the generator 206 needs to rotate unidirectionally to stably generate electricity, so the reversing mechanism 208 is needed to convert the motion direction.

[0033] The reversing mechanism 208 comprises first and second vertical straight bevel gears 301 and 302 and a third horizontal straight bevel gear 303, the third straight bevel gear 303 is connected with a gear box 305 through a bearing 304, and the first and second straight bevel gears 301 and 302 are connected with the gear box 305 in a similar manner. The first straight bevel gear 301 is connected with the driving shaft 203 through a first one-way bearing, the second straight bevel gear 302 is connected with the driving shaft 203 through a second one-way bearing, and the first and second one-way bearings are in the same direction. The horizontal eccentric pendulum 209 is fixedly connected with the first straight bevel gear 301. When the horizontal eccentric pendulum 209 swings clockwise, the first one-way bearing is locked, the first straight bevel gear 301 is locked with the driving shaft 203, and the driving shaft 203 is driven to rotate clockwise; when the horizontal eccentric pendulum 209 swings counterclockwise, the first one-way bearing is not locked, the second straight bevel gear 302 is driven to rotate clockwise due to the transmission of the third straight bevel gear 303, the second one-way bearing is locked, the second straight bevel gear 302 is locked with the driving shaft 203, and the driving shaft 203 is still driven to rotate clockwise, so that the bidirectional motion of the horizontal eccentric pendulum 209 is converted into unidirectional rotation of the driving shaft 203.

[0034] The self-adjusting gear ratio transmission mechanism is provided with three sets of driving gears mounted on the driving shaft 203 and three sets of driven gears mounted on the driven shaft 204, the three sets of driving gears are respectively engaged with the three sets of driven gears, and the gear ratios are 0.513, 1 and 1.318 respectively, corresponding to calm, normal and severe sea conditions. The driving gears are connected with the driving shaft 203 through bearings, and the internal reserved grooves 308 are used for engaging with the latch 503 of the controllable latch device 407. The driven gears are fixedly connected with the driven shaft 204. The self-adjusting gear ratio transmission mechanism switches the gear sets through the controllable latch device 407. Specifically, the first driving gear 401, the second driving gear 402 and the third driving gear 403 are mounted on the driving shaft 203, and the first driven gear 404, the second driven gear 405 and the third driven gear 406 are mounted on the driven shaft 204, and the first driven gear 404, the second driven gear 405 and the third driven gear 406 are engaged with the first driving gear 401, the second driving gear 402 and the third driving gear 403.

[0035] The controllable latch device 407 is fixedly installed in the driving shaft 203 and comprises a rudder 501, a guide rail wheel 502, a latch 503 and a guide groove platform 504. The rudder 501 is an angle positioning module with a control system and is suitable for accurately controlling the angle. The guide rail wheel 502 is located above the guide groove platform 504, and the rudder 501 is located below the guide groove platform 504. The rudder 501 is directly connected with the guide rail wheel 502, and the guide rail wheel 502 is installed on the output end of the rudder 501. The guide groove platform 504 is provided with a groove for mounting the latch 503, and the guide rail wheel 502 is provided with an arc-shaped guide groove 506 for guiding the latch 503 to extend into or exit the action. One end of the arc-shaped guide groove 506 is close to the center of the guide rail wheel 502, and the other end is away from the center. The latch 503 is provided with a key 505 at the tail end, and the key 505 is matched and installed with the arc-shaped guide groove 506. The rudder 501 drives the guide rail wheel 502 to rotate, and the key 505 at the tail end of the latch 503 is matched with the arc-shaped guide groove of the guide rail wheel 502, so as to control the latch 503 to extend into or exit the internal reserved groove 308 of the driving gear (401, 402, 403), thereby selecting different gear sets to engage. When the sea condition changes, the torque sensor 207 monitors the torque of the horizontal eccentric pendulum 209 in real time, the controller sends a command to control the corresponding rudder 501 to start, adjusts the position of the latch 503, and realizes the self-adaptive switching of the gear ratio.

[0036] The top of the floating body shell 105 is welded with a conical steel frame 103, and a helical wind turbine 104 is installed inside the conical steel frame 103, the fan blades 102 of which are arranged along a vertical axis, the narrow tube structure formed by the steel frame accelerates the wind speed, and the efficiency of the helical wind turbine 104 is improved through the wind speed enhancement effect; the outer surface of the conical steel frame 103 is covered with a photovoltaic panel 101, and the photovoltaic panel 101 and the helical wind turbine 104 are electrically connected with the power supply system of the floating body, for supplying power to the control module and the energy storage device, and can supply power to the control system and the sensor, and complementarily supply power with the wave energy power generation system in the absence of wind or on cloudy days.

[0037] Working principle: the torque of the horizontal eccentric pendulum 209 is monitored in real time through the torque sensor 207, the corresponding gear set is selected according to the preset threshold value, the pin 503 of the controllable pin device 407 is driven to extend and retract through the steering engine 501 to switch the working gear set, and the transmission ratio is adjusted to match the current sea conditions; the irregular speed fluctuation of the driven shaft 204 is absorbed by the inertial flywheel 205 to ensure the stable operation of the generator 206, and the energy complementation is realized through the wind-solar-wave combined power generation system to improve the overall power supply stability.

[0038] The embodiment also discloses a control method, which comprises the following steps: (1) anchoring the device on the sea surface, the wave drives the floating body to pitch, the horizontal eccentric pendulum 209 drives the driving shaft 203 to swing bidirectionally, and the unidirectional rotation is converted through the reversing mechanism 208; (2) the torque of the horizontal eccentric pendulum 209 is detected in real time through the torque sensor 207, the controller selects the gear set (0.513 for calm sea conditions, 1 for normal conditions, and 1.318 for severe sea conditions) according to the preset threshold value, and drives the steering engine 501 to switch the position of the pin 503; the gear ratio of the working transmission gear set on the driving shaft 203 and the driven shaft 204 is automatically adjusted to change the resistance of the pendulum motion, so that the pendulum motion and the floating body motion reach resonance, the low-torque high-efficiency transmission under calm sea conditions and the overload protection under severe sea conditions are considered, and the wave energy under different sea conditions can be more effectively utilized, so as to improve the power generation efficiency under all sea conditions; (3) the driving shaft 203 drives the driven shaft 204 through the selected gear set, the inertial flywheel 205 absorbs the speed fluctuation to ensure that the generator 206 outputs stable electric energy; (4) the helical wind turbine 104 in the conical steel frame 103 generates electricity through the narrow tube effect, and the photovoltaic panel 101 converts light energy into electric energy, which is complementarily stored in the energy storage device with the wave energy.

[0039] In the embodiment, Ansys-AQWA and Wec-sim numerical simulation software are used to optimize the pendulum mass and the PTO combination, and the optimal pendulum mass and PTO damping are obtained, the mass of the horizontal eccentric pendulum 209 is 1300 kg, and the damping coefficient of the generator 206 is matched to be 1900 Nsm / rad.

[0040] PTO optimization is carried out in calm sea state, normal sea state and rough sea state respectively, and the gear ratio applicable to each sea state is designed based on the optimization, as shown in Table 1. Among them, the significant wave height is defined as the average value of the wave height of the first 1 / 3 part after arranging the observed wave height in size, also known as the effective wave height. In ocean engineering, the significant wave height is widely used to evaluate the rolling state of the ship, the risk of coastal structure damage and the intensity of extreme sea conditions.

[0041] Table 1 Sea state and gear ratio design table The instantaneous power generation of the device running in each sea state with the gear ratio applicable to each sea state is calculated by using Ansys-AQWA and Wec-sim numerical simulation software, as shown in Table 1. Figures 7-9 The average power generation in three sea states is calculated to be 498.94w, 3518.30w and 7056.96w. The application matches the wave frequency in real time through the self-adjusting gear ratio system, and the width ratio is improved to 0.213 (the traditional pendulum device is about 0.15-0.18), which significantly improves the wave energy utilization rate. The average power generation of the application is about 3735w. If the device runs with a single gear ratio i=1 applicable to normal sea state, the average power generation of the device running with a gear ratio i=1 in calm sea state and rough sea state is calculated to be 23.34w and 1328.45w respectively.

[0042] The wind, light and wave coordinated power supply guarantee system of the application can still run stably on cloudy days or windless days, and the comprehensive energy utilization rate is improved by more than 35%. The inertial flywheel mechanism smoothes the mechanical fluctuation, and the instantaneous power generation fluctuation range is reduced to 1.7-5kW (the traditional device can reach 0-15kW), and the power stability is improved by 40%.

[0043] The average power generation efficiency of the device in the Huangbohai sea area is 0.23, which is improved by 13.25% compared with the traditional single gear ratio device. The application has high power generation efficiency, high comprehensive energy utilization rate and high power generation stability through multi-degree-of-freedom wave energy capture, self-adaptive gear ratio adjustment and wind, light and wave complementary power supply, and is suitable for island power supply, ocean monitoring platform and other scenes.

[0044] The technical features of the above-described embodiments can be combined arbitrarily, and in order to make the description concise, not all possible combinations of the technical features in the above-described embodiments are described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.

Claims

1. A multi-degree-of-freedom combined marine energy generation device that adapts to sea conditions, characterized in that: include: The floating base is a closed hemispherical shape. The drive shaft (203) and the driven shaft (204) are installed vertically inside the float base; The wave energy power generation device is located inside the floating body base and includes: a wave energy input mechanism, a reversing mechanism (208) and an energy conversion end mechanism. The wave energy input mechanism and the reversing mechanism (208) are mounted on the drive shaft (203), and the energy conversion end mechanism is mounted on the driven shaft (204). The wave energy input mechanism inputs unidirectional rotation to the energy conversion end mechanism under the action of the reversing mechanism (208). The self-adjusting gear ratio system is located inside the float seat and includes: a variable gear set, each gear set having a meshing drive wheel and a driven wheel, and the gear ratio between each gear set is different. The drive wheel of each set is mounted on the drive shaft (203) by bearings and each drive wheel has an inner groove (308). The driven wheel of each set is fixedly mounted on the driven shaft (204). A torque sensor (207) is mounted on the drive shaft (203); A controllable pin device (407) is fixedly installed in the drive shaft (203), and the controllable pin device (407) is provided with a pin (503) that cooperates with the inner groove (308). The controllable pin device (407) controls the pin (503) to extend into or retract from the inner groove (308) based on the torque measured by the torque sensor (207), and switches the gear set to adapt to different sea conditions.

2. The adaptive sea state multi-degree-of-freedom combined ocean energy generation device according to claim 1, characterized in that, The end of the pin (503) is provided with a key (505); The controllable pin device (407) also includes: a servo motor (501), a guide wheel (502), and a guide groove platform (504). The guide wheel (502) is located above the guide groove platform (504), and the servo motor (501) is located below the guide groove platform (504). The guide wheel (502) is installed at the output end of the servo motor (501). The guide platform (504) has a slot for installing the pin (503), and the guide wheel (502) has an arc-shaped guide groove (506) for guiding the pin (503) to extend or retract. One end of the arc-shaped guide groove (506) is close to the center of the guide wheel (502) and the other end is far away. The key (505) is installed in conjunction with the arc-shaped guide groove (506).

3. The adaptive sea state multi-degree-of-freedom combined ocean energy generation device according to claim 2, characterized in that, The arc-shaped guide grooves (506) are centrally symmetrically distributed on the plane of the guide wheel (502).

4. The adaptive sea state multi-degree-of-freedom combined ocean energy generation device according to claim 1, characterized in that, Each gear set has a controllable pin device (407) at its driving gear.

5. The adaptive sea state multi-degree-of-freedom combined ocean energy power generation device according to claim 1, characterized in that, The variable gear set has three sets of gears with gear ratios of 0.513, 1 and 1.318, corresponding to calm, normal and severe sea conditions respectively.

6. The adaptive sea state multi-degree-of-freedom combined ocean energy power generation device according to claim 1, characterized in that, The controllable pin device (407) has four pins (503) evenly arranged in the circumferential direction.

7. The adaptive sea state multi-degree-of-freedom combined ocean energy generation device according to claim 1, characterized in that, The reversing mechanism includes: a first bevel gear (301) and a second bevel gear (302) in the vertical direction, and a third bevel gear (303) in the horizontal direction. The first bevel gear (301) is connected to the drive shaft (203) through a first one-way bearing, and the second bevel gear (302) is connected to the drive shaft (203) through a second one-way bearing. The first one-way bearing and the second one-way bearing are in the same direction. The third bevel gear (303) meshes with the first bevel gear (301) and the second bevel gear (302) for transmission. The wave energy input mechanism includes: an adjustable load (210) and a horizontal eccentric pendulum (209); the horizontal eccentric pendulum (209) is fixedly connected to the first straight bevel gear (301), and the adjustable load (210) is provided at the end of the swing arm of the horizontal eccentric pendulum (209). The power conversion terminal mechanism includes an inertial flywheel (205) and a generator (206). The input shaft of the generator (206) is fixedly connected to the inertial flywheel (205), and the inertial flywheel (205) is connected to the driven shaft (204) through a one-way bearing.

8. The adaptive sea state multi-degree-of-freedom combined marine energy generation device according to claim 1, characterized in that, A conical steel frame (103) is welded to the top of the floating body seat. A spiral wind turbine (104) is installed inside the conical steel frame (103). The blades (102) of the spiral wind turbine (104) are arranged along the vertical axis. A photovoltaic panel (101) is installed on the outside of the tapered steel frame (103).

9. A control method, characterized in that, The control method is used to control the adaptive sea state multi-degree-of-freedom combined ocean energy power generation device as described in claim 1, and includes the following steps: S1. Anchor the device to the sea surface. Waves drive the floating seat to pitch and roll. The wave energy input mechanism inputs unidirectional rotation to the power conversion end mechanism under the action of the reversing mechanism (208). S2. The torque sensor (207) detects the torque at the wave energy input mechanism in real time, selects the gear set according to the preset threshold, drives the controllable pin device (407) to control the pin (503) to extend into or out of the inner groove (308), and switches the gear set to adapt to different sea conditions. S3, the drive shaft (203) drives the driven shaft (204) through a selected gear set, and the power conversion terminal mechanism It absorbs speed fluctuations and outputs stable electrical energy.

10. The control method according to claim 9, characterized in that, Also includes: Wind power and photovoltaic power generation complement wave energy generation. The wind power and photovoltaic power generation are connected to the power supply system of the floating body to power the control module and energy storage device.

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