Oscillating water column and floating fan combined wind wave energy integrated system

Abstract

The invention discloses a wind wave energy integration system combining an oscillating water column and a floating fan, and relates to the technical field of wind wave energy integration utilization, comprising: a floating foundation module which is of a semi-submersible triangular truss structure and is fixed through an anchoring system; the oscillating water column energy conversion module is arranged on the outer side of the buoyancy chamber, comprises a gas water chamber, an adjustable guide plate and a bidirectional pneumatic turbine, and is matched with a permanent magnet synchronous generator; the floating type fan module is arranged on the central truss and comprises a three-blade horizontal shaft fan, a hydraulic variable pitch system and a permanent magnet direct drive generator; the energy management module comprises a rectification unit, an inversion unit, a hybrid energy storage unit and a monitoring unit and is used for realizing smooth power output; the posture stabilizing module is provided with 4-6 hydraulic active stabilizing fins and a posture sensor, and the inclination angle of the floating body is controlled within + / -5 degrees. The energy utilization efficiency and the output stability are improved, the anti-storm capacity is enhanced, the anti-corrosion service life is prolonged, the cost is reduced, the device adapts to multiple sea conditions, and support is provided for large-scale development of storm energy.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of integrated utilization of wind and wave energy, and particularly relates to a wind and wave energy integrated system combining oscillating water column and floating wind turbine. BACKGROUND

[0002] Among the renewable energy sources in the ocean, wind energy and wave energy are abundant and widely distributed, and have great development and utilization potential. As the core equipment for offshore wind energy development, floating wind turbines have achieved large-scale application, but due to the intermittent nature of wind speed, the output power of a single machine fluctuates dramatically, especially during periods of low wind speed, the power generation efficiency decreases significantly, making it difficult to achieve stable power supply. The oscillating water column wave energy generation device drives the water column in the air chamber to reciprocate through waves, and pushes the turbine to generate electricity, which has stable output characteristics in medium and low wave height environments, but has the problems of low energy density and easy overload and damage in high wave height. When operating alone, it lacks economic efficiency and reliability.

[0003] Existing wind and wave energy utilization schemes are mostly simple superposition of wind turbines and wave energy devices, and do not form an integrated system. The floating foundation is designed independently, and the wind turbine and the wave energy device are installed on different floating bodies, resulting in large occupation of marine space, complex anchoring system, and significantly increased construction and maintenance costs. At the same time, the two lack a cooperative control mechanism, and each operates independently at the maximum power point without considering the complementary characteristics of wind energy and wave energy. When the wind speed or wave height is insufficient, the total output power of the system still fluctuates greatly, and the advantages of combined energy cannot be fully utilized.

[0004] The harsh marine environment poses strict requirements on the stability and durability of the system. Traditional floating foundations are prone to large inclination and displacement under the combined action of wind and waves, which can cause the wind turbine blades to sweep the sea or the wave energy device to be damaged by water. Single coating structure is often used for corrosion and protection, and the coating is easy to peel off in high salt mist and strong current environment. Marine organisms can further reduce the power generation efficiency and structural life. In addition, the energy management system lacks a targeted hybrid energy storage ratio design, making it difficult to adapt to the dynamic characteristics of wind and wave energy combined output. The service life of the energy storage unit is shortened due to frequent charging and discharging, further affecting the economic efficiency and reliability of the system operation. These problems make it difficult for existing schemes to achieve efficient, stable, and low-cost development of wind and wave energy, and an integrated system is needed to solve the above technical bottlenecks. SUMMARY

[0005] The present application proposes a wind and wave energy integrated system combining oscillating water column and floating wind turbine to solve the problems mentioned in the prior art.

[0006] To achieve the above purpose, the present application adopts the following technical scheme: a wind and wave energy integrated system combining oscillating water column and floating wind turbine, comprising:

[0007] The floating foundation module adopts a semi-submersible triangular truss structure, is provided with an arc-shaped heaving plate at the bottom, and an anchoring system adopts a pure catenary structure and contains three groups of anchor chains.

[0008] The oscillating water column energy conversion module is arranged outside one of the floating cabins of the floating foundation, adopts an integrated air-water chamber structure, has a water chamber depth of 6 m-10 m, is provided with adjustable guide plates at the bottom, and the guide plates are adjusted at an angle of 15°-45° through a hydraulic push rod. A bidirectional self-regulating pneumatic turbine is installed at the top of the air chamber, and a permanent magnet synchronous generator is matched. The module has dual functions of power generation and roll reduction. When the attitude sensor detects that the roll / pitch angle of the floating body is greater than ±3°, the controller adjusts the guide plate to a high resistance state of 25°-45°, increases the water inlet / outlet resistance of the water chamber to consume wave energy, and assists in suppressing the swing of the floating body. When the inclination angle is less than or equal to ±1°, the guide plate is adjusted to a low resistance state of 15°-20°, and the power generation efficiency is preferentially ensured.

[0009] The floating wind turbine module is installed at the top of the central truss of the floating foundation, adopts a three-blade horizontal axis wind turbine, has a hydraulic variable pitch system and a speed increasing gear box built in the hub, is matched with a 2MW-5MW permanent magnet direct drive generator, and the tower is a conical steel pipe structure.

[0010] The energy management module is arranged in the central floating cabin and is composed of a rectifier unit, an inverter unit, a hybrid energy storage unit and a monitoring unit. The rectifier unit adopts a three-phase bridge rectifier circuit, the inverter unit adopts an IGBT module, the hybrid energy storage unit contains a lithium battery group and a super capacitor group, the lithium battery capacity is 50kWh-200kWh, the super capacitor capacity is 5kWh-20kWh, and the monitoring unit adopts a PLC controller to monitor the power generation power and the energy storage state in real time.

[0011] The attitude stabilizing module is provided with one to two hydraulic active stabilizing fins outside the bottom of each of the three floating cabins. The attitude sensor is a MEMS three-axis gyroscope and an accelerometer, data is transmitted to the controller through a CAN bus, and the controller is linked with the oscillating water column module. When the stabilizing fin alone is insufficient for roll control, the roll reduction mode of the guide plate is triggered.

[0012] Further, a cooperative control module is further included. The module adopts an improved maximum power point tracking algorithm and is composed of a main controller and two sub-controllers. The main controller is an industrial embedded processor, and the sub-controllers correspond to the wind turbine and the oscillating water column power generation unit respectively. The output power optimization formula is wherein P total is the total output power of the system, P w is the output power of the wind turbine, P o is the output power of the oscillating water column, k w is the power weight coefficient of the wind turbine, k o is the power weight coefficient of the oscillating water column, and k w +k o= 1; η w η is the wind turbine power generation efficiency; η o η is the oscillating water column power generation efficiency; v is the real-time wind speed; H is the wave height, and the weight coefficient is dynamically adjusted according to the real-time data collected by the wind speed sensor and the wave sensor.

[0013] Further, it also includes an anti-corrosion protection module, which adopts a multi-layer composite anti-corrosion structure, the bottom layer is a zinc-aluminum alloy thermal spraying coating, the middle layer is a solvent-free epoxy resin sealing coating, and the outer layer is a polyurea elastomer protective coating; at the same time, an electrochemical cathodic protection system is configured, and the sacrificial anode is made of zinc alloy material; the marine bio-adhesion prevention system is a slow-release antifouling device, which is installed on the surface of the water chamber and the stabilizing fin, and the antifouling agent composition is a copper ion and organic tin compound.

[0014] Further, the horizontal restoring force calculation formula of the anchoring system of the floating foundation module is wherein F h is the horizontal restoring force; x is the horizontal displacement of the floating body; c1 is the linear stiffness coefficient; c2 is the nonlinear stiffness coefficient; c3 is the wind wave coupling coefficient; v is the real-time wind speed; H is the wave height.

[0015] Further, the aerodynamic turbine of the oscillating water column energy conversion module adopts a self-straightening design, the blade leading edge is provided with a circular arc transition structure with a radius of 0.03-0.08 m, which functions to reduce airflow separation, reduce aerodynamic noise, and improve turbine inlet smoothness, and the trailing edge adopts a serrated noise reduction design, and the turbine efficiency improvement formula is wherein η is the improved turbine efficiency; η0 is the traditional turbine efficiency; Re is the Reynolds number; D is the turbine diameter; L is the air chamber height; a honeycomb airflow straightener is configured at the turbine inlet.

[0016] Further, the hydraulic variable pitch system of the floating wind turbine module adopts double closed-loop control, including a power outer ring and a position inner ring, and the variable pitch actuator is a blade type hydraulic motor with a rated torque of 5000 N·m-15000 N·m, and the variable pitch angle adjustment formula is wherein θ is the target pitch angle; θ0 is the initial pitch angle; k p is the proportional coefficient; k i is the integral coefficient; k d is the differential coefficient; P ref is the reference power; P act is the actual power; v is the real-time wind speed; v rated is the rated wind speed; t is time.

[0017] Further, the capacity ratio formula of the hybrid energy storage unit of the energy management module is wherein C bat is the lithium battery capacity; Ccap is the super capacitor group capacity; f is the wind speed fluctuation frequency; P max is the system maximum power generation; P min is the system minimum power generation; P avg is the system average power generation; tau is the energy storage response time; the energy storage system adopts a DC / DC bidirectional converter, when the power generation is more than 10% higher than the load demand, the excess power is stored in the energy storage unit; when the power generation is less than 5% lower than the load demand, the energy storage unit releases power to supplement.

[0018] Further, the control algorithm of the stabilizing fin of the attitude stabilizing module is Wherein b is the fin rotation angle; k is the proportional gain; alpha is the inclination angle of the floating body; b is the damping coefficient; alpha is the inclination angle velocity; k f is the wind and wave feedforward coefficient; v is the real-time wind speed; H is the wave height; phi is the wind and wave incidence angle; the controller adopts a PID+feedforward control strategy, the feedforward signal comes from the wind and wave prediction sensor, and the stabilizing fin attitude is adjusted in advance by 0.2s-0.5s.

[0019] Further, the weight coefficient adjustment formula of the cooperative control module is k w = 0.5 + 0.5*tanh(0.1*(v-10) + 0.05*(H-3)), wherein k w is the wind turbine power weight coefficient; v is the real-time wind speed; H is the wave height; when the wind speed is higher than 10m / s and the wave height is lower than 2m, k w tends to 1 with the increase of the wind speed, k0 tends to 0, and wind energy is preferentially utilized; when the wind speed is 5m / s-10m / s and the wave height is 2m-4m, k w and k0 are proportionally distributed; when the wind speed is lower than 5m / s and the wave height is higher than 4m, k w tends to 0.1, k0 tends to 0.9, and wave energy is preferentially utilized.

[0020] Further, the release amount of the antifouling agent of the corrosion prevention and protection module is adjusted according to the seawater temperature and flow rate, and the adjustment formula is Q=Q0*[1+0.03*(T-20)+0.02*(u-0.5)], wherein Q is the actual release amount; Q0 is the reference release amount; T is the seawater temperature; u is the seawater flow rate; the release amount increases by 3% when the temperature increases by 1 DEG C; the release amount increases by 2% when the flow rate increases by 0.1m / s; when the temperature is lower than 10 DEG C and the flow rate is lower than 0.3m / s, the release amount is reduced to 70% of the reference value.

[0021] Compared with the prior art, the beneficial effects of the present application are:

[0022] In terms of structural integration and stability, the system adopts a semi-submersible triangular truss floating foundation, integrates the wind turbine and the oscillating water column device, and forms a stable support structure with three floating cabins. The bottom heaving plate and the combined anchor system significantly improve the wind and wave resistance. The attitude stability module adjusts the floating body attitude in real time through active hydraulic stability fins and wave front feed control, greatly reduces the inclination and displacement amplitude, avoids wind turbine sweeping the sea or wave energy device overload damage, and solves the problems of poor stability and large space occupation of traditional dispersed structure. At the same time, the integrated design simplifies the anchor system, reduces the occupation of marine space, reduces the construction and maintenance cost, and improves the economic efficiency of the system.

[0023] In terms of energy utilization and output stability, the coordinated control module dynamically adjusts the power weight coefficient of wind energy and wave energy based on their complementary characteristics. When the wind speed is high, wind energy is preferred, and when the wave height is obvious, wave energy generation is focused. The improved maximum power point tracking algorithm optimizes the total power output combined with the wind and wave coupling characteristics, and the precise capacity ratio of the hybrid energy storage system effectively smooths the power fluctuation, solving the problem of unstable single energy generation. Even in the scene of low wind speed or low wave height single resource deficiency, the system can still maintain stable output through complementary operation, significantly improving the power supply reliability.

[0024] In terms of environmental adaptability and durability, the corrosion protection module adopts a double protection strategy of multi-layer composite coating and cathodic protection. The outer polyurea elastomer coating has excellent impact resistance and aging resistance, and cooperates with the adjustable release antifouling system to effectively inhibit marine bioattachment, greatly extending the service life of the structure. The adjustable guide plate and self-rectifying turbine design of the oscillating water column device adapt to different wave height environments, avoiding overload damage at high wave height, and improving power generation efficiency at low wave height, further enhancing the environmental adaptability of the system.

[0025] Overall, the system realizes the leap from "simple superposition" to "deep integration" in wind and wave energy development, improves energy utilization efficiency and power supply stability, reduces structural cost and maintenance difficulty, and prolongs the service life of the system, providing reliable technical support for the commercialization and commercialization of offshore wind and wave energy. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 The schematic block diagram of the wind and wave energy integrated system combining the oscillating water column and the floating wind turbine proposed by the present application;

[0027] Figure 2 The power weight coefficient change curve graph under different sea conditions;

[0028] Figure 3 The system attitude stability comparison graph under different sea conditions. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the protection scope of the present application.

[0030] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0031] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited. In addition, the terms "mounting", "connection", and "connection" should be broadly understood, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the communication between two elements. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances, and the present application will be further described in detail with reference to the drawings.

[0032] Referring to Figures 1 to 3 An oscillating water column and floating wind turbine integrated system, comprising the following modules:

[0033] The floating foundation module adopts a semi-submersible triangular truss structure, the truss material is Q355B low alloy high-strength steel, and the surface is treated by shot blasting (Sa2.5 level). The main body of the floating body is composed of three cylindrical floating cabins, the single floating cabin has a diameter of 15m-25m and a height of 8m-12m, the floating cabin spacing is 18m-28m, and the draft is 5m-10m. Three to five arc-shaped heave plates (curvature radius 1.5m-2.5m, area 8m 2 -15m 2), and the bottom of the floating chamber is rigidly connected through a flange. Three groups of R4 level mooring chains (diameter 0.2m-0.3m, breaking strength 1200kN-2000kN, pre-tension 100kN-300kN) are contained, the angle between the anchor chain and the sea level is 20°-40°, and the horizontal restoring force calculation formula is adjusted as F h =c1·x+c2·x 3 , to ensure that the horizontal displacement of the floating body is controlled within 5m under 10m wave height and 25m / s wind speed, and to avoid the interference of the tension leg with the movement of the wave energy device.

[0034] The oscillating water column energy conversion module is arranged outside one of the floating chambers of the floating foundation, adopts an integrated air-water chamber structure, the air chamber has a height of 8m-12m and a cross-sectional size of 5m*5m-8m*8m, is made of weathering steel, and the inner wall is lined with a 3mm-5mm-thick stainless steel corrosion-resistant layer; the water chamber has a depth of 6m-10m, and the bottom is provided with an adjustable guide plate made of titanium alloy and having an area of 4m 2 -6m 2 , and the angle is adjusted by 15°-45° through a hydraulic push rod with an adjustment accuracy of ±1°. A bidirectional self-regulating pneumatic turbine is installed at the top of the air chamber, the turbine blades have an airfoil section, the number of the turbine blades is 8-12, the diameter of the turbine blades is 1.5m-2.5m, the rated rotating speed is 1500r / min-2500r / min, the blade leading edge of the bidirectional self-regulating pneumatic turbine at the top of the air chamber has a circular arc transition structure (radius 0.05m), which can reduce the separation phenomenon of airflow on the blade surface, reduce the aerodynamic noise (noise reduction 3-5dB), and at the same time improve the air inlet smoothness, so that the turbine efficiency fluctuation range is reduced to ±2%; a permanent magnet synchronous generator is matched, the rated power is 50kW-200kW, and the efficiency is ≥90%; when the attitude sensor (MEMS three-axis gyroscope) detects that the roll / pitch angle of the floating body is >±3°, the controller adjusts the angle of the guide plate to 25°-45° (high resistance state) through the hydraulic push rod, increases the energy dissipation when the water chamber intakes water / outlets water, and assists in offsetting the impact force of the wave on the floating body; when the inclination angle is ≤±1°, the guide plate is reset to 15°-20° (low resistance state), the wave power generation efficiency is preferentially ensured, and dynamic switching of “light rocking power generation and heavy rocking damping” is realized.

[0035] The floating wind turbine module is installed at the top of the central truss of the floating foundation, adopts a three-blade horizontal axis wind turbine, the blade material is carbon fiber reinforced resin-based composite material, the length is 20m-35m, the chord length is 1.2m-2.5m, the torsion angle is 0°-15°, the swept area is 1250m 2 -3800m 2The hub is made of nodular cast iron material, the height is 30m-50m, the built-in hydraulic variable pitch system and the speed increasing gear box, the gear box transmission ratio is 1:50-1:80, it is matched with 2MW-5MW permanent magnet direct drive generator, the cut-in wind speed is 3m / s-4m / s, the rated wind speed is 12m / s-16m / s, the cut-out wind speed is 20m / s-25m / s, and the survival wind speed is 50m / s-60m / s. The tower is a conical steel pipe structure, the bottom diameter is 3m-5m, the top diameter is 1.5m-2.5m, and the wall thickness is 15mm-30mm.

[0036] The energy management module is arranged in the central floating cabin and is composed of a rectifier unit, an inverter unit, a hybrid energy storage unit and a monitoring unit. The rectifier unit adopts a three-phase bridge rectifier circuit, the input voltage range is 220V-690V, and the output DC voltage is 500V-800V; the inverter unit adopts an IGBT module, the output AC voltage is 380V / 50Hz, and the total harmonic distortion rate is less than or equal to 3%; the hybrid energy storage unit includes a lithium battery group and a super capacitor group, the lithium battery capacity is 50kWh-200kWh, the charging and discharging efficiency is greater than or equal to 90%, and the cycle life is greater than or equal to 3000 times; the super capacitor capacity is 5kWh-20kWh, the charging and discharging efficiency is greater than or equal to 95%, and the cycle life is greater than or equal to 100,000 times. The monitoring unit adopts a PLC controller, the sampling frequency is 50Hz, the power generation power and the energy storage state can be monitored in real time, the power smooth output can be realized, and the fluctuation range is controlled within ±5%.

[0037] The attitude stabilizing module is provided with one to two hydraulic active stabilizing fins on the outer side of the bottom of each of the three floating cabins, a total of four to six, the fin blade is made of aluminum alloy material, has a trapezoidal structure, an area of 2m 2 -4m 2 , and an aspect ratio of 3-5, can realize an adjustment of a turning angle of -30° to +30°, the adjustment speed is 5° / s-10° / s, and the response time is less than or equal to 0.5s. The attitude sensor is a MEMS three-axis gyroscope and an accelerometer, the sampling frequency is 10Hz-20Hz, the measurement accuracy is ±0.1°, data is transmitted to the controller through a CAN bus, and the controller adjusts the stabilizing fin angle in real time according to the attitude data, so that the roll and pitch inclination angle of the floating body is controlled within ±5°, and the heave amplitude is controlled within ±1.5m.

[0038] In the application, a cooperative control module is further included, the module adopts an improved maximum power point tracking algorithm, is composed of a main controller and two sub-controllers, the main controller is an industrial embedded processor, and the sub-controllers correspond to the fan and the oscillating water column power generation unit respectively. The output power optimization formula is wherein P total is the total output power of the system, unit: kW; P w is the fan output power, unit: kW; P o is the oscillating water column output power, unit: kW; k wk is the power weighting coefficient for wind turbines. o The power weighting coefficient for the oscillating water column is given by k. w +k o =1; η w The wind turbine's power generation efficiency is taken as 0.85-0.95; η o The power generation efficiency of the oscillating water column is set to 0.7-0.8; v is the real-time wind speed in m / s; and H is the wave height in m. The weighting coefficients are dynamically adjusted based on real-time data collected by wind speed sensors (measurement range 0-60 m / s, accuracy ±0.1 m / s) and wave sensors (measurement range 0.1 m-10 m, accuracy ±0.05 m), with an adjustment cycle of 0.5 s-1 s.

[0039] This invention also includes a corrosion protection module, employing a multi-layer composite corrosion protection structure. The bottom layer is a zinc-aluminum alloy thermal spray coating with a thickness of 80μm-120μm and a bonding strength ≥50MPa; the middle layer is a solvent-free epoxy resin sealing coating with a thickness of 150μm-200μm and a hardness ≥3H; the outer layer is a polyurea elastomer protective coating with a thickness of 200μm-300μm, a tensile strength ≥15MPa, an elongation at break ≥300%, and an overall corrosion protection life ≥15 years. An electrochemical cathodic protection system is also included, with sacrificial anodes made of zinc alloy. Four to six sacrificial anodes are installed in each float, each weighing 50kg-100kg, with a protection current density of 0.05mA / m. 2 -0.1mA / m 2 The marine biological antifouling system is a slow-release antifouling device installed on the surface of the water chamber and stabilizing fins. The antifouling agent is a complex of copper ions and organotin compounds, with a storage capacity of 5kg-10kg, a release rate of 0.5g / h-2g / h, and an effective antifouling period of ≥2 years.

[0040] In this invention, the formula for calculating the horizontal restoring force of the mooring system of the floating foundation module is as follows: Where F h ρ is the horizontal restoring force, in kN; x is the horizontal displacement of the floating body, in meters; c1 is the linear stiffness coefficient, ranging from 50 kN / m to 100 kN / m; c2 is the nonlinear stiffness coefficient, with a value of 0.5 kN / m. 3 -2kN / m 3 c3 is the wind-wave coupling coefficient, with a value of 0.2 kN / (m·m^(1 / 2)·m); v is the real-time wind speed, in m / s; H is the wave height, in m. The angle between the anchor chain and the sea level is controlled between 20° and 40°, and the preload of the tension leg is 20%-30% of its breaking strength. Through this combined structure, the horizontal displacement of the buoy at a wave height of 10m and a wind speed of 25m / s is controlled within 5m.

[0041] The aerodynamic turbine of the oscillating water column energy conversion module adopts a self-rectifying design, the blade leading edge is provided with a circular arc transition structure, the trailing edge adopts a sawtooth-shaped noise reduction design, and the turbine efficiency improvement formula is Wherein, η is the improved turbine efficiency; η0 is the traditional turbine efficiency, and the value is 0.7-0.75; Re is the Reynolds number, and the value range is 1x10 6 -5x10 6 ; D is the turbine diameter, unit m; L is the air chamber height, unit m. The honeycomb airflow rectifier with a pore diameter of 50mm-100mm is arranged at the turbine inlet, can reduce airflow disturbance, and makes the turbine stably run in the range of wave period 3s-10s and wave height 0.5m-6m, and the efficiency is improved by 10%-15%.

[0042] In the application, the hydraulic variable pitch system of the floating wind turbine module adopts double closed loop control, contains power outer ring and position inner ring, the variable pitch actuator is a vane type hydraulic motor, the rated torque is 5000N·m-15000N·m, and the variable pitch angle adjustment formula is Wherein, θ is the target pitch angle, unit °; θ0 is the initial pitch angle, and the value is 0°-5°; k p Is the proportional coefficient, and the value is 0.1-0.3; k i Is the integral coefficient, and the value is 0.01-0.05; k d Is the differential coefficient, and the value is 0.005-0.02; P ref Is the reference power, unit kW; P act Is the actual power, unit kW; v is the real-time wind speed, unit m / s; v rated Is the rated wind speed, unit m / s; t is the time, unit s. The response time of the variable pitch system is ≤0.3s, the positioning accuracy is ±0.1°, and the power fluctuation amplitude of the wind turbine is reduced by 20%-30% when the wind speed fluctuation is 3m / s-5m / s.

[0043] In the application, the capacity matching formula of the hybrid energy storage unit of the energy management module is Wherein, C bat Is the lithium battery pack capacity, unit kWh; C cap Is the super capacitor pack capacity, unit kWh; f is the wind speed fluctuation frequency, unit Hz, and the value range is 0.1Hz-1Hz; P max Is the maximum power generation of the system, unit kW; P min Is the minimum power generation of the system, unit kW; P avgP is the system average power generation, unit: kW; τ is the energy storage response time, unit: s, the value range is 0.1s-1s. The energy storage system adopts a DC / DC bidirectional converter, the conversion efficiency is greater than or equal to 96%, when the power generation is more than 10% higher than the load demand, the excess power is stored in the energy storage unit; when it is less than 5% below the load demand, the energy storage unit releases the electric energy to supplement, and ensures the stability of the output power.

[0044] In the application, the control algorithm of the stabilizing fin of the attitude stabilizing module is Wherein b is the fin rotation angle, unit: °; k is the proportional gain, the value is 5-10; α is the inclination angle of the floating body, unit: °; b is the damping coefficient, the value is 0.5-2; α is the inclination angle velocity, unit: ° / s; k f is the wind wave feedforward coefficient, the value is 0.1-0.3; v is the real-time wind speed, unit: m / s; H is the wave height, unit: m; φ is the wind wave incidence angle, unit: °. The controller adopts the PID+feedforward control strategy, the feedforward signal comes from the wind wave forecasting sensor (the forecasting accuracy is ±0.5m / s wind speed and ±0.2m wave height, the forecasting time is 10min-30min), the stabilizing fin attitude is adjusted in advance 0.2s-0.5s, so that the attitude adjustment response speed is improved by 25%-40%, and the inclination angle is controlled within ±3° in the extreme sea conditions.

[0045] In the application, the weight coefficient adjustment formula of the cooperative control module is k w =0.5+0.5·tanh(0.1·(v―10)+0.05·(H―3)), wherein k w is the wind turbine power weight coefficient; v is the real-time wind speed, unit: m / s; H is the wave height, unit: m. When the wind speed is higher than 10m / s and the wave height is lower than 2m, k w tends to 1 with the increase of the wind speed, k0 tends to 0, and the wind energy is preferentially utilized; when the wind speed is 5m / s-10m / s and the wave height is 2m-4m, k w and k0 are proportionally distributed; when the wind speed is lower than 5m / s and the wave height is higher than 4m, k w tends to 0.1, k0 tends to 0.9, and the wave energy is preferentially utilized. The module also has a fault switching function, when any power generation unit fails, the weight coefficient of the other unit is automatically adjusted to 1.

[0046] In the present application, the antifouling agent release amount of the corrosion protection module can be adjusted according to the seawater temperature and flow rate, and the adjustment formula is Q = Q0·[1+0.03·(T-20)+0.02·(u-0.5)], wherein Q is the actual release amount, unit g / h; Q0 is the reference release amount, the value is 0.5 g / h-1 g / h; T is the seawater temperature, unit ℃, the measurement range is-2 ℃-35 ℃, the accuracy is ±0.2 ℃; u is the seawater flow rate, unit m / s, the measurement range is 0-2 m / s, the accuracy is ±0.05 m / s. The release amount increases by 3% for every 1 ℃ increase in temperature; the release amount increases by 2% for every 0.1 m / s increase in flow rate; when the temperature is lower than 10 ℃ and the flow rate is lower than 0.3 m / s, the release amount is reduced to 70% of the reference value, ensuring that the antifouling effect in different sea areas such as tropical and temperate zones is stable, and the attachment amount of marine organisms is controlled within 5 g / m 2 The following.

[0047] The specific implementation of the system is further illustrated by two embodiments as follows:

[0048] Embodiment 1: Offshore wind farm large-scale application scenario

[0049] This embodiment is aimed at offshore wind farms with a water depth of 30 m-50 m, which need to realize large-scale stable power generation and low-cost operation and maintenance, and the specific implementation is as follows.

[0050] I. Detailed implementation of technical scheme

[0051] Floating foundation module: Q355B low-alloy high-strength steel is used to make a semi-submersible triangular truss, the truss rod diameter is 0.8 m-1.2 m, the wall thickness is 20 mm-30 mm, and the surface shot blasting rust removal level reaches Sa2.5 level. Three cylindrical floating cabins, each with a diameter of 20 m-25 m and a height of 10 m-12 m, have a spacing of 22 m-28 m and a draft depth of 8 m-10 m. Four arc heave plates with a curvature radius of 2 m-2.5 m and an area of 12 m 2 -15 m 2 , are installed at the bottom and rigidly connected with the floating cabin through M30 high-strength flanges. The anchoring system is 3 groups of R4 level anchor chains (diameter 0.25 m-0.3 m, breaking strength 1600 kN-2000 kN, pre-tension 200 kN-300 kN), the anchor chain and the sea level have an included angle of 30°-40°, and the horizontal restoring force is calculated according to F h =80x+1.5x 3 (c1=80kN / m、c2=1.5kN / m 3 ), to avoid the interference of the tension leg with the motion of the wave energy device.

[0052] Oscillating water column energy conversion module: an integrated air-water chamber is built outside one of the floating cabins, the air chamber is made of weathering steel material, the height is 10m-12m, the cross-sectional size is 7m x 7m-8m x 8m, the inner wall is lined with a 4mm-5mm thick 316L stainless steel corrosion-resistant layer. The water chamber is 8m-10m deep, the titanium alloy guide plate at the bottom has an area of 5m 2 -6m 2 , a hydraulic push rod of model CD250 is used to achieve 15°-45° adjustment, the adjustment accuracy is ±0.5°. A two-way self-adjusting aerodynamic turbine with 10-12 airfoil blades is installed at the top of the air chamber, the diameter is 2m-2.5m, the rated speed is 2000r / min-2500r / min, the blade leading edge circular arc radius is 0.05m, the tail edge serration depth is 0.02m, a 200kW permanent magnet synchronous generator (efficiency ≥90%) is matched. The turbine efficiency is calculated according to the formula η = η0·[1 + 0.02·Re 0 .2 + 0.015·(D / L) 0 .3], η0 = 0.75, Re = 3 x 10 6 , D = 2.5m, L = 12m. The inlet honeycomb flow straightener has a hole diameter of 80mm-100mm to reduce airflow disturbance; when the floating body pitch angle reaches 3.5°, the guide plate automatically switches from 20° (power generation mode) to 35° (stabilization mode), which can increase the wave energy dissipation rate by 18%-25% through actual measurement, and the auxiliary stabilizing fin can control the floating body inclination angle within ±2.5°, which is 30% higher than the single stabilizing fin control effect.

[0053] Floating wind turbine module: a 3MW horizontal axis wind turbine is installed at the top of the central truss, the blades are carbon fiber reinforced resin matrix composites, the length is 30m-35m, the chord length is 1.8m-2.5m, the twist angle is 5°-15°, and the swept area is 2826m 2 -3846m 2 . The nodular cast iron hub is 40m-50m high, and the built-in blade type hydraulic motor (rated torque 10000N·m-15000N·m) and speed increasing gear box (transmission ratio 1:60-1:80) are matched with a permanent magnet direct drive generator, the cut-in wind speed is 3.5m / s-4m / s, the rated wind speed is 14m / s-16m / s, and the cut-out wind speed is 22m / s-25m / s. The hydraulic variable pitch system adopts double closed loop control, the variable pitch angle is calculated according to the formula , θ0 = 3°, k p = 0.2, k i = 0.03, k d = 0.01, the response time is ≤0.2s, and the positioning accuracy is ±0.05°. The conical tower has a bottom diameter of 4m-5m and a top diameter of 2m-2.5m, and the wall thickness is 25mm-30mm.

[0054] Energy management module: Three-phase bridge rectifier (input 220V-690V, output 600V-800V), IGBT inverter unit (output 380V / 50Hz, total harmonic distortion ≤2%), hybrid energy storage unit and PLC monitoring unit (sampling frequency 50Hz) are arranged in the central floating cabin. The hybrid energy storage contains 150kWh-200kWh lithium battery (charge-discharge efficiency ≥92%, cycle life ≥4000 times) and 15kWh-20kWh super capacitor (charge-discharge efficiency ≥96%, cycle life ≥150,000 times), and the capacity ratio is according to the formula P max =3200kW, P min =200kW, P avg =1700kW, τ=0.5s. DC / DC bidirectional converter conversion efficiency ≥97%, power fluctuation control within ±3%.

[0055] Attitude stabilization module: 2 aluminum alloy trapezoidal stabilizing fins (area 3m 2 -4m 2 , aspect ratio 4-5) are installed at the bottom of each floating cabin, which can realize -30° to +30° angle adjustment, and the adjustment speed is 8° / s-10° / s. A MEMS three-axis gyroscope and accelerometer (sampling frequency 15Hz-20Hz, accuracy ±0.05°) are matched, and the data is transmitted to the controller through CAN bus. The stabilizing fin angle is calculated according to the formula k=8, b=1.5, k f =0.2, combined with the wind and wave forecast sensor (forecast accuracy ±0.3m / s, ±0.1m, time effect 20min-30min) to adjust the attitude 0.3s-0.5s in advance, and the inclination angle is controlled within ±3°.

[0056] Cooperative control module: the main controller uses an embedded processor with model STM32F407, and the sub-controllers are connected to the fan and the oscillating water column unit. The total power is calculated according to the formula η w =0.9, η o =0.75, and the weight coefficient is adjusted according to k w =0.5+0.5·tanh(0.1·(v―10)+0.05·(H―3)), when the wind speed is 12m / s and the wave height is 2m, k w =0.8, k o =0.2, and the adjustment period is 0.5s. When a fault occurs, the weight is automatically switched to 1.

[0057] Anticorrosion protection module: the surface of the floating body is successively sprayed with a zinc-aluminum alloy coating (bonding strength ≥ 60 MPa) of 80 μm-100 μm, an epoxy resin coating (hardness ≥ 4H) of 180 μm-200 μm, and a polyurea elastomer (tensile strength ≥ 18 MPa, elongation at break ≥ 350%) of 250 μm-300 μm. Each floating cabin is installed with 5-6 zinc alloy sacrificial anodes of 50 kg-80 kg, and the protection current density is 0.08 mA / m 2 -0.1 mA / m 2 The water chamber and the surface of the stabilizing fin are installed with a slow-release antifouling device (storage agent 8 kg-10 kg), and the release amount is calculated according to Q = Q0·[1+0.03·(T-20)+0.02·(u-0.5)], Q0= 0.8 g / h, Q = 1.12 g / h when the water temperature is 25℃ and the flow rate is 0.8 m / s.

[0058] II. Effect verification data

[0059] Table 1

[0060] Performance index Traditional decentralized wind wave energy system The integrated system Energy utilization efficiency Generally Good Output power stability Poor Good Floating body posture stability Generally Good Structural anticorrosion life Generally Good Unit power construction cost High Low

[0061] Table 1 verifies the core advantages of the integrated system in the offshore wind farm scenario. In the traditional decentralized system, the wind turbine and the wave energy device operate independently, and the complementary resources are not utilized cooperatively, so the energy utilization efficiency is generally low. In the present system, the weight is dynamically allocated by the cooperative control module, and the efficiency is significantly improved when the wind speed and wave height are complementary. In terms of power stability, the traditional system is greatly affected by the intermittency of a single energy source, and the fluctuation is large. In the present system, the mixed energy storage is proportioned accurately to smooth the fluctuation, and the stable output is achieved in combination with the cooperative control. In terms of attitude stability, the traditional decentralized foundation has weak resistance to wind and waves, and the inclination angle is easy to exceed the standard. In the present system, the active stabilizing fin cooperates with the combined anchor mooring, and the attitude control is better. In terms of anticorrosion life, the traditional single coating protection is insufficient, and the multi-layer composite anticorrosion and antifouling design of the present system prolongs the service life. In terms of unit cost, the integrated foundation and the simplified anchor mooring system greatly reduce the construction investment, and the economic advantage is prominent.

[0062] Example 2: Island Reefs Off-Grid Power Supply Scenario

[0063] This example is aimed at the off-grid power supply demand of remote islands, and needs to adapt to complex sea conditions with a water depth of 10 m-20 m, to realize small size and high reliability power supply. The specific implementation is as follows.

[0064] I. Detailed implementation of technical scheme

[0065] Floating foundation module: Q355B steel triangular truss, rod diameter 0.6 m-0.8 m, wall thickness 15 mm-20 mm, shot blasting rust removal Sa2.5 level. 3 floating cabins with a diameter of 15 m-20 m, a height of 8 m-10 m, a spacing of 18 m-22 m, and a draught of 5 m-8 m. 3 bottom heaving plates (curvature radius 1.5 m-2 m, area 8 m2 -12m 2 ), flange connection. The mooring system contains 3 groups of R4 grade anchor chains (diameter 0.2m-0.25m, breaking strength 1200kN-1600kN, pre-tension 100kN-200kN) and 3 groups of tension legs (diameter 0.15m-0.2m, stiffness 500kN / m-600kN / m), c1=60kN / m, c2=1kN / m, c3=0.2kN / (m·m^(1 / 2)·m) in the horizontal restoring force formula. 3

[0066] Oscillating water column energy conversion module: air-water chamber height 8m-10m, cross section 5m×5m-6m×6m, inner wall 3mm-4mm stainless steel lining. Guide vane area 4m 2 -5m 2 , hydraulic push rod adjustment accuracy ±1°. Turbine diameter 1.5m-2m, 8-10 blades, rated speed 1500r / min-2000r / min, matched with 50kW-100kW generator (efficiency ≥90%). Turbine efficiency formula η0=0.7, Re=2×10 6 , D=2m, L=10m. Rectifier aperture 50mm-80mm.

[0067] Floating wind turbine module: 1.5MW wind turbine, blade length 20m-25m, chord length 1.2m-1.8m, twist angle 0°-10°, swept area 1256m 2 -1962m 2 . Hub height 30m-40m, hydraulic motor torque 5000N·m-8000N·m, gear box transmission ratio 1:50-1:60, cut-in wind speed 3m / s-3.5m / s, rated wind speed 12m / s-14m / s, cut-out wind speed 20m / s-22m / s. Variable pitch formula θ0=2°, k p =0.15, k i =0.02, k d =0.008. Tower base diameter 3m-4m, wall thickness 15mm-25mm.

[0068] Energy management module: rectifier output 500V-600V, inverter total harmonic distortion ≤3%. Hybrid energy storage contains 50kWh-100kWh lithium battery and 5kWh-10kWh super capacitor, matching formula f=0.8Hz, P ma′x =1600kW, P min =50kW, P avg =825kW, τ=0.3s. Converter efficiency ≥96%, power fluctuation within ±5%.

[0069] ​Attitude stabilization module: 3 floating cabins each equipped with 1 stabilizing fin (area 2 m 2 -3 m 2 , aspect ratio 3-4), adjustment speed 5° / s-8°. Sensor sampling frequency 10 Hz-15 Hz, accuracy ±0.1°. In the formula of the stabilizing fin, k = 6, b = 1, k f = 0.15, adjustment in advance 0.2 s-0.3 s, inclination angle within ±5°.

[0070] Cooperative control module: main controller model STM32F103, in the formula of total power, η w = 0.85, ηo = 0.7, in the formula of weight, when the wind speed is 8 m / s and the wave height is 3 m, k w = 0.5, k o = 0.5, adjustment period 1 s.

[0071] Anti-corrosion and protection module: coating thickness 80 μm zinc-aluminum alloy, 150 μm epoxy resin, 200 μm polyurea. Each floating cabin has 4-5 50 kg zinc alloy anodes, protection current density 0.05 mA / m 2 -0.08 mA / m 2 . In the formula of anti-fouling release amount, Qo = 0.5 g / h, water temperature 20℃, flow rate 0.5 m / s, Q = 0.5 g / h.

[0072] II. Effect verification data

[0073] Table 2

[0074] Performance index Traditional single energy supply system The integrated system Survivability in extreme sea conditions Poor Good Off-grid power supply reliability Generally Good System maintenance frequency High Low Energy complementary utilization effect None Good Environmental adaptability Generally Good

[0075] Table 2 highlights the core value of the system in the island reef scenario. In the traditional single energy system, the fan is easily damaged in extreme sea conditions such as typhoons, and the wave energy device alone is insufficient for power supply, with poor survival ability and reliability; the integration of the system and the active stabilizing fin improves the wind and wave resistance, and can still operate stably in extreme sea conditions. In terms of power supply reliability, the traditional system is affected by the intermittency of single energy, with high risk of power failure; the system of the present application complements power generation with wind and waves, and cooperates with hybrid energy storage to provide off-grid power without interruption. In terms of maintenance frequency, the traditional system has weak anti-corrosion and anti-fouling ability and needs frequent maintenance; the multi-layer protection and intelligent anti-fouling design of the system of the present application reduces the maintenance requirement. In terms of energy complementation and environmental adaptability, the system of the present application fully utilizes the wind and wave resources of the island reef, adapts to different sea conditions, and the traditional single system cannot achieve this, fully meeting the power supply demand of the island reef.

[0076] Reference Figure 2The figure intuitively shows the dynamic weight adjustment strategy of the cooperative control module. In the low wind speed and high wave height working condition, the system automatically reduces the weight of the fan and increases the weight of the wave energy to fully utilize the stability of the wave energy. As the wind speed increases, the system gradually increases the weight of the fan to take advantage of the high energy density of the wind energy. In the extreme gust condition, the weight of the fan tends to 1 but maintains a small proportion of wave energy power supply to ensure the stability of the system.

[0077] Reference Figure 3 The figure clearly compares the attitude stability of the system of the application and the traditional system under different sea conditions. The pitch angle of the traditional system under various sea conditions is significantly larger than that of the system of the application, especially in the high-energy combined sea condition and the extreme gust sea condition.

[0078] The above is only the preferred specific embodiment of the application, but the protection scope of the application is not limited thereto, any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the application within the technical range disclosed by the application, which should be covered in the protection scope of the application.

Claims

1. A wind and wave energy integration system combining an oscillating water column and a floating wind turbine, characterized in that, include: The floating foundation module adopts a semi-submersible triangular truss structure with an arc-shaped heave plate at the bottom. The mooring system adopts a pure catenary structure with 3 sets of anchor chains. The oscillating water column energy conversion module is located on the outside of one of the floating hulls of the floating foundation. It adopts an integrated air-water chamber structure with a water chamber depth of 6m-10m. An adjustable guide plate is provided at the bottom, and the angle can be adjusted from 15° to 45° via a hydraulic push rod. A bidirectional self-rectifying pneumatic turbine is installed at the top of the air chamber, which is equipped with a permanent magnet synchronous generator. This module has dual functions of power generation and roll reduction: when the attitude sensor detects that the buoy's roll / pitch angle is > ±3°, the controller adjusts the guide plate to a high-resistance state of 25°-45° to increase the water inlet / outlet resistance of the water chamber to consume wave energy and help suppress the buoy's sway; when the tilt angle is ≤ ±1°, the guide plate is adjusted to a low-resistance state of 15°-20°. The floating wind turbine module is installed on the top of the central truss of the floating foundation. It adopts a three-bladed horizontal axis wind turbine with a built-in hydraulic pitch system and speed-increasing gearbox in the hub. It is equipped with a 2MW-5MW permanent magnet direct drive generator and the tower is a tapered steel pipe structure. The energy management module, located inside the central floating hull, consists of a rectifier unit, an inverter unit, a hybrid energy storage unit, and a monitoring unit. The rectifier unit uses a three-phase bridge rectifier circuit, the inverter unit uses IGBT modules, and the hybrid energy storage unit includes a lithium battery pack and a supercapacitor pack. The lithium battery capacity is 50kWh-200kWh, and the supercapacitor capacity is 5kWh-20kWh. The monitoring unit uses a PLC controller to monitor the power generation and energy storage status in real time. The attitude stabilization module is equipped with 1-2 hydraulic active stabilizing fins on the outer side of the bottom of each of the three buoys. The attitude sensors are MEMS three-axis gyroscopes and accelerometers. The data is transmitted to the controller via CAN bus. The controller is linked with the oscillating water column module. When the stabilizing fins alone are not effective in controlling the sway, the deflector plate anti-sway mode is triggered.

2. The wind and wave energy integrated system combining an oscillating water column and a floating wind turbine according to claim 1, characterized in that, It also includes a collaborative control module, which employs an improved maximum power point tracking algorithm. This module consists of a main controller and two sub-controllers. The main controller is an industrial-grade embedded processor, and the sub-controllers correspond to the wind turbine and the oscillating water column power generation unit, respectively. The output power optimization formula is as follows: Where P total P represents the total output power of the system. w P is the output power of the fan. o k is the output power of the oscillating water column. w k is the power weighting coefficient for wind turbines. o The power weighting coefficient for the oscillating water column is given by k. w +k o =1; η w For wind turbine power generation efficiency; η o The oscillating water column power generation efficiency is represented by v, the real-time wind speed, and H, the wave height. The weighting coefficients are dynamically adjusted based on the real-time data collected by the wind speed sensor and the wave sensor.

3. The wind and wave energy integrated system combining an oscillating water column and a floating wind turbine according to claim 1, characterized in that, It also includes an anti-corrosion protection module, which adopts a multi-layer composite anti-corrosion structure. The bottom layer is a zinc-aluminum alloy thermal spray coating, the middle layer is a solvent-free epoxy resin sealing coating, and the outer layer is a polyurea elastomer protective coating. It is also equipped with an electrochemical cathodic protection system, with the sacrificial anode made of zinc alloy. The marine organism anti-fouling system is a slow-release antifouling device, installed on the surface of the water chamber and the stabilizing fin. The antifouling agent is a copper ion and organotin compound.

4. The wind and wave energy integrated system combining an oscillating water column and a floating wind turbine according to claim 1, characterized in that, The formula for calculating the horizontal restoring force of the mooring system of the floating foundation module is as follows: Where F h denoted as σ0, where σ0 is the horizontal restoring force; x is the horizontal displacement of the floating body; c1 is the linear stiffness coefficient; c2 is the nonlinear stiffness coefficient; c3 is the wind-wave coupling coefficient; v is the real-time wind speed; and H is the wave height.

5. The wind and wave energy integration system combining an oscillating water column and a floating wind turbine according to claim 1, characterized in that, The aerodynamic turbine of the oscillating water column energy conversion module adopts a self-rectifying design. The leading edge of the blades has a circular arc transition structure with a radius of 0.03-0.08m, which reduces airflow separation, lowers aerodynamic noise, and improves turbine intake smoothness. The trailing edge uses a sawtooth noise reduction design. The turbine efficiency improvement formula is... Where η is the improved turbine efficiency; η0 is the conventional turbine efficiency; Re is the Reynolds number; D is the turbine diameter; L is the chamber height; a honeycomb airflow rectifier is installed at the turbine inlet.

6. The wind and wave energy integrated system combining an oscillating water column and a floating wind turbine according to claim 1, characterized in that, The hydraulic pitch control system of the floating wind turbine module adopts dual closed-loop control, including an outer power loop and an inner position loop. The pitch actuator is a blade-type hydraulic motor with a rated torque of 5000 N·m-15000 N·m. The pitch angle adjustment formula is as follows: Where θ is the target pitch angle; θ0 is the initial pitch angle; k p k is the proportionality coefficient. i k is the integral coefficient; d P is the differential coefficient; ref P is the reference power. act v is the actual power; v is the real-time wind speed; v rated t represents the rated wind speed; t represents time.

7. The wind and wave energy integration system combining an oscillating water column and a floating wind turbine according to claim 1, characterized in that, The capacity ratio formula for the hybrid energy storage unit of the energy management module is as follows: Where C bat For lithium battery pack capacity; C cap This refers to the capacity of the supercapacitor bank. f is the wind speed fluctuation frequency; P max P represents the system's maximum power generation. min P is the minimum power output of the system. avg τ represents the system's average power generation; τ represents the energy storage response time. The energy storage system uses a DC / DC bidirectional converter. When the power generation is more than 10% higher than the load demand, the excess power is stored in the energy storage unit; when it is less than 5% lower than the load demand, the energy storage unit releases power to supplement it.

8. The wind and wave energy integration system combining an oscillating water column and a floating wind turbine according to claim 1, characterized in that, The stabilizing fin control algorithm of the attitude stabilization module is as follows: Where b is the fin rotation angle; k is the proportional gain; α is the float tilt angle; and b is the damping coefficient. k is the tilt angular velocity; f φ is the wind and wave feedforward coefficient; v is the real-time wind speed; H is the wave height; φ is the wind and wave incident angle; the controller adopts a PID + feedforward control strategy, and the feedforward signal comes from the wind and wave forecast sensor, adjusting the attitude of the stabilizing fin 0.2s-0.5s in advance.

9. The wind and wave energy integration system combining an oscillating water column and a floating wind turbine according to claim 2, characterized in that, The weighting coefficient adjustment formula for the collaborative control module is k. w = 0.5 + 0.5·tanh(0.1·(v-10) + 0.05·(H-3)), where k w K is the wind turbine power weighting coefficient; v is the real-time wind speed; H is the wave height; when the wind speed is higher than 10 m / s and the wave height is lower than 2 m, k w As wind speed increases, k approaches 1, and k0 approaches 0, prioritizing the utilization of wind energy; when wind speed is 5m / s-10m / s and wave height is 2m-4m, k... w Distribute proportionally with k0; when the wind speed is below 5 m / s and the wave height is above 4 m, k w Approaching 0.1, k0 approaches 0.9, wave energy is utilized preferentially.

10. The wind and wave energy integration system combining an oscillating water column and a floating wind turbine according to claim 3, characterized in that, The antifouling agent release amount of the anti-corrosion protection module is adjusted according to seawater temperature and flow velocity. The adjustment formula is Q=Q0·[1+0.03·(T―20)+0.02·(u―0.5)], where Q is the actual release amount; Q0 is the baseline release amount; T is the seawater temperature; u is the seawater flow velocity; for every 1℃ increase in temperature, the release amount increases by 3%; for every 0.1m / s increase in flow velocity, the release amount increases by 2%; when the temperature is below 10℃ and the flow velocity is below 0.3m / s, the release amount drops to 70% of the baseline value.

Images