Offshore power generation system and method combining wind energy and wave energy

Abstract

The invention discloses an offshore power generation system and method combining wind energy and wave energy. The system comprises a wind energy collection subsystem, a wave energy collection subsystem, an energy storage subsystem and a water turbine power generation subsystem. The wind energy collection subsystem is used for capturing wind energy of sea stormy waves and driving a first water suction pump to lift seawater into the energy storage subsystem through the wind energy; the wave energy collection subsystem is used for collecting wave energy of water surface waves and driving a second water suction pump to lift seawater into the energy storage subsystem through the wave energy; and the energy storage subsystem is used for storing the lifted seawater and discharging the seawater in the high-level reservoir into the water turbine power generation subsystem when a pipeline valve in the energy storage subsystem is opened, so that a power generator in the water turbine power generation subsystem is driven to generate power. According to the invention, wind energy and wave energy can be simultaneously utilized to drive the generator to operate, so that the utilization efficiency of offshore energy is greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of marine energy utilization, and particularly to an offshore power generation system and method combining wind energy and wave energy. Background Art

[0002] With the continuous growth of energy demand and the enhancement of environmental protection awareness, the development and utilization of renewable energy have become the focus of the scientific research and industrial communities. Marine energy, especially wind energy, has received extensive attention due to its huge potential and relatively stable characteristics. However, although the pure wind power generation system has been developed to a certain extent, it fails to fully utilize the rich wave energy resources in the ocean, resulting in a waste of energy.

[0003] The lack of an offshore power generation system that combines wind energy and wave energy means that the complementary advantages of the two types of energy cannot be realized, and it is difficult to build a more efficient and stable energy supply system. This not only is not conducive to fully tapping the potential of marine energy and improving energy utilization efficiency, but also hinders the further development of renewable energy to a certain extent and cannot better meet the growing energy demand. Summary of the Invention

[0004] The present invention provides an offshore power generation system and method combining wind energy and wave energy. The system collects and utilizes wind energy and wave energy to drive the generator to operate, greatly improving the utilization efficiency of offshore energy.

[0005] An embodiment of the present invention provides an offshore power generation system combining wind energy and wave energy, including: a wind energy collection subsystem, a wave energy collection subsystem, an energy storage subsystem, and a water turbine power generation subsystem; the wind energy collection subsystem includes a first water pump; the wave energy collection subsystem includes a second water pump; the energy storage subsystem includes pipeline valves and a high-level water reservoir; the water turbine power generation subsystem includes a water turbine and a generator;

[0006] The wind energy collection subsystem is used to capture the wind energy of the sea waves and drive the first water pump to lift seawater to the energy storage subsystem through the wind energy;

[0007] The wave energy collection subsystem is used to collect the wave energy of the water surface waves and drive the second water pump to lift seawater to the energy storage subsystem through the wave energy;

[0008] The energy storage subsystem is used to store the seawater lifted by the wind energy collection subsystem and the wave energy collection subsystem, and when the pipeline valves are opened, discharge the seawater in the high-level water reservoir to the water turbine power generation subsystem;

[0009] The water turbine power generation subsystem is used to drive the water turbine to rotate so that the generator is driven by the water turbine to generate electricity; wherein, the seawater flowing in through the energy storage subsystem is used to drive the water turbine to rotate.

[0010] Further, the wind energy collection subsystem includes a first water pump, a horizontal axis fan blade, a first transmission shaft, and a wind energy transmission belt;

[0011] The horizontal axis fan blade is used to capture the wind energy of the sea waves and transfer the wind energy into the first transmission shaft;

[0012] The first transmission shaft is used to transfer the wind energy into the wind energy transmission belt so that the wind energy transmission belt transfers the wind energy to the first water pump;

[0013] The first water pump is used to lift seawater into the energy storage subsystem.

[0014] Further, the wave energy collection subsystem includes a second water pump, a wave collecting channel, a horizontal axis rotor, a second transmission shaft, and a wave energy transmission belt;

[0015] The wave collecting channel is used to collect the wave energy of the water surface waves and transfer the wave energy to the horizontal axis rotor to drive the horizontal axis rotor to rotate;

[0016] The second transmission shaft is used to transfer the wave energy to the wave energy transmission belt after being driven by the rotating horizontal axis rotor;

[0017] The wave energy transmission belt is used to transfer the wave energy to the second water pump to drive the second water pump to work, so that seawater is lifted into the energy storage subsystem by the second water pump.

[0018] Further, the water turbine power generation subsystem includes a water turbine, a generator, and a water lifting pipeline;

[0019] The water lifting pipeline is used to guide the seawater in the high-level water storage tank to the water turbine to drive the water turbine to rotate;

[0020] The water turbine is used to drive the generator to generate electricity.

[0021] Further, the offshore power generation system combining wind energy and wave energy further includes: a wave parameter monitoring subsystem and a communication subsystem;

[0022] The wave parameter monitoring subsystem is used to obtain the rotation speed of the horizontal axis rotor; and based on the rotation speed and a preset rotation speed fitting coefficient, calculate the wave intensity data suffered by the offshore power generation system in each direction, and send the wave intensity data to the communication subsystem;

[0023] The communication subsystem is used to calculate a wave intensity vector based on the constructed unit vector and the wave intensity data; and determine the propagation direction of the water surface waves according to the wave intensity vector.

[0024] Further, the wave parameter monitoring subsystem includes: a plurality of wave level sensors and a plurality of gyroscopes; each of the wave level sensors includes a light source column and a photosensitive column; the photosensitive column includes a plurality of sensors.

[0025] The gyroscope is used to sense the angular information of the wave level sensor and send the angular information to the communication subsystem.

[0026] The light source column is used to emit a plurality of infrared rays to the photosensitive column.

[0027] The photosensitive column is used to send the position information of the sensor that receives the weak infrared ray with a light intensity lower than a preset threshold to the communication subsystem after sensing the weak infrared ray.

[0028] The communication subsystem is further used to determine the wave height information according to the position information, the angular information and the preset water level zero line position.

[0029] Further, the light source column includes a plurality of infrared ray generators; the infrared ray generators adopt KY-008 laser modules; each of the sensors is composed of a photoresistor and an LM393 dual voltage comparator integrated circuit.

[0030] Further, the offshore power generation system combining wind energy and wave energy further includes: an upper platform, a lower platform, a plurality of pile columns and a collision prevention fence; the collision prevention fence includes a collision prevention cross bar and a plurality of collision prevention vertical bars.

[0031] The upper platform is connected to the lower platform through the pile columns; the collision prevention fence is installed in a manner of surrounding the pile columns.

[0032] Further, each of the collision prevention vertical bars is equipped with one of the wave level sensors and one of the gyroscopes.

[0033] An embodiment of the present invention also provides an offshore power generation method combining wind energy and wave energy, including:

[0034] Obtain the seawater lifted by the wind energy collection subsystem and the seawater lifted by the wave energy collection subsystem; wherein, the seawater lifted by the wind energy collection subsystem is driven and lifted by a first water pump located in the wind energy collection subsystem; the seawater lifted by the wave energy collection subsystem is driven and lifted by a second water pump located in the wave energy collection subsystem.

[0035] Store the seawater lifted by the wind energy collection subsystem and the wave energy collection subsystem in a high-level reservoir.

[0036] When the pipeline valve is opened, discharge the seawater in the high-level reservoir into the water turbine power generation subsystem, so that the water turbine in the water turbine power generation subsystem drives the generator in the water turbine power generation subsystem to generate electricity under the drive of the discharged seawater.

[0037] By implementing the present invention, the following beneficial effects are achieved:

[0038] The present invention provides an offshore power generation system and method combining wind energy and wave energy. The system includes a wind energy collection subsystem, a wave energy collection subsystem, an energy storage subsystem, and a water turbine power generation subsystem. The wind energy collection subsystem lifts the seawater driven by wind energy to the energy storage subsystem through a water pump. Similarly, the wave energy collection subsystem lifts the seawater driven by wave energy to the energy storage subsystem through a water pump, thereby realizing the efficient capture and conversion of these two clean energies, wind energy and wave energy.

[0039] The energy storage subsystem is used to store the seawater lifted by the wind energy collection subsystem and the wave energy collection subsystem. The collected seawater is stored in a high-level reservoir, which plays a role in energy buffering and regulation. Under the control of the pipeline valve, it can stably discharge seawater to the water turbine power generation subsystem, driving the water turbine to rotate continuously, and then driving the generator to generate electricity stably. This method overcomes the intermittency and instability of wind energy and wave energy itself, ensures the reliability and continuity of power supply, and greatly improves the utilization efficiency of offshore energy. Description of the Drawings

[0040] In order to more clearly illustrate the technical solutions of the present application, the drawings required for implementation will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0041] Figure 1 is a schematic structural diagram of an offshore power generation system combining wind energy and wave energy provided by an embodiment of the present application;

[0042] Figure 2 is a schematic structural diagram of a wave position sensor provided by an embodiment of the present application;

[0043] Figure 3 is a schematic diagram of wave height calculation provided by an embodiment of the present application;

[0044] Figure 4It is a top view of an offshore power generation system that combines wind energy and wave energy provided by an embodiment of the present application;

[0045] Figure 5 It is a schematic flowchart of a method for generating electricity offshore that combines wind energy and wave energy provided by another embodiment of the present application. Detailed implementation manners

[0046] To make the objectives, technical solutions, and advantages of the present application clearer, the technical solutions in the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0048] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means more than two unless otherwise specifically defined.

[0049] Referring to "embodiments" herein means that specific features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase does not necessarily refer to the same embodiment everywhere in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0050] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0051] In the description of the embodiments of the present application, the term "a plurality" means two or more (including two). Similarly, "a plurality of groups" means two or more groups (including two groups), and "a plurality of pieces" means two or more pieces (including two pieces).

[0052] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0053] See Figure 1 , which is a schematic structural diagram of an offshore power generation system combining wind energy and wave energy provided by an embodiment of the present invention, including: a wind energy collection subsystem 1, a wave energy collection subsystem 2, an energy storage subsystem 3, and a water turbine power generation subsystem 4; the wind energy collection subsystem 1 includes a first water pump 1-1; the wave energy collection subsystem 2 includes a second water pump 2-1; the energy storage subsystem 3 includes a pipeline valve 3-1 and a high-level water storage tank 3-2; the water turbine power generation subsystem 4 includes a water turbine 4-1 and a generator 4-2;

[0054] The wind energy collection subsystem 1 is used to capture the wind energy of the sea waves and drive the first water pump 1-1 to lift seawater to the energy storage subsystem 3 by the wind energy;

[0055] The wave energy collection subsystem 2 is used to collect the wave energy of the water surface waves and drive the second water pump 2-1 to lift seawater to the energy storage subsystem 3 by the wave energy;

[0056] The energy storage subsystem 3 is used to store the seawater lifted by the wind energy collection subsystem 1 and the wave energy collection subsystem 2, and when the pipeline valve 3-1 is opened, discharge the seawater in the high-level water storage tank 3-2 to the water turbine power generation subsystem 4;

[0057] The water turbine power generation subsystem 4 is used to drive the water turbine 4-1 to rotate, so that the generator 4-2 is driven by the water turbine 4-1 to generate electricity; wherein, the seawater flowing in through the energy storage subsystem 3 is used to drive the water turbine 4-1 to rotate;

[0058] Specifically, the high-level water reservoir 3-2 of the energy storage subsystem 3 is used to store the seawater lifted by wind energy and wave energy. By controlling the opening and closing of the pipeline valve 3-1, the water flow is adjusted to the water turbine power generation subsystem 4 to achieve the conversion of gravitational potential energy into electrical energy; the design of the high-level water reservoir provides energy buffering, and through a three-stage energy conversion mechanism, the stability and continuity of power output are ensured.

[0059] See Figure 1 , in a preferred embodiment, the wind energy collection subsystem 1 includes a first water pump 1-1, a horizontal axis fan blade 1-2, a first transmission shaft 1-3, and a wind energy conveyor belt 1-4;

[0060] The horizontal axis fan blade 1-2 is used to capture the wind energy of the sea waves and transfer the wind energy to the first transmission shaft 1-3;

[0061] The first transmission shaft 1-3 is used to transfer the wind energy to the wind energy conveyor belt 1-4, so that the wind energy conveyor belt 1-4 transfers the wind energy to the first water pump 1-1;

[0062] The first water pump 1-1 is used to lift seawater to the energy storage subsystem 3;

[0063] Specifically, the wind energy collection subsystem 1 adopts the design of the horizontal axis fan blade 1-2, uses wind power to drive the first water pump 1-1, and lifts seawater to the high-level water reservoir 3-2 in the energy storage subsystem 3 through the connected water pool 5;

[0064] By adopting the horizontal axis fan blade 1-2, the offshore wind power can be captured more effectively, and the wind energy is converted into the kinetic energy of the water pump through mechanical transmission. In this embodiment, the design of the wind energy collection subsystem fully considers the characteristics of the offshore wind power that sometimes exists and sometimes disappears, and is sometimes strong and sometimes weak, so that the wind energy can be fully utilized even when the wind speed is unstable.

[0065] See Figure 1 , in a preferred embodiment, the wave energy collection subsystem 2 includes a second water pump 2-1, a wave collecting channel 2-2, a horizontal axis rotor 2-3, a second transmission shaft 2-4, and a wave energy conveyor belt 2-5;

[0066] The wave collecting channel 2-2 is used to collect the wave energy of the water surface waves and transfer the wave energy to the horizontal axis rotor 2-3 to drive the horizontal axis rotor 2-3 to rotate;

[0067] The second transmission shaft 2-4 is used to transfer the wave energy to the wave energy conveyor belt 2-5 after being driven by the rotated horizontal axis rotor 2-3;

[0068] The wave energy transmission belt 2-5 is used to transmit the wave energy to the second water pump 2-1 to drive the second water pump 2-1 to work, so that seawater is lifted by the second water pump 2-1 into the energy storage subsystem 3;

[0069] See Figure 1 , in a preferred embodiment, the offshore power generation system combining wind energy and wave energy further includes: an upper platform 6, a lower platform 7, a plurality of pile columns 8 and a collision prevention fence 9; the collision prevention fence 9 includes a collision prevention cross bar 9-1 and a plurality of collision prevention vertical bars 9-2;

[0070] The upper platform 6 is connected to the lower platform 7 through the pile columns 8; the collision prevention fence 9 is installed in a manner surrounding the pile columns 8;

[0071] Specifically, the wave energy collection subsystem 2 is placed equidistantly in four directions around the pile columns, with 4 to 6 pieces; the collision prevention fence 9 is installed outside the wave energy collection subsystem 2; the water waves on the water surface carry their own kinetic energy and flow to the horizontal axis rotor 2-3 along the wave collecting channel 2-2, driving the horizontal axis rotor 2-3 to rotate, driving the connected wave energy transmission belt 2-5 to rotate, driving the second water pump 2-1 to work, and lifting seawater to the high-level water storage tank 3-2 through the connecting pool 5, ensuring the efficient conversion of wave energy into gravitational potential energy.

[0072] See Figure 1 , in a preferred embodiment, the water turbine power generation subsystem 4 includes a water turbine 4-1, a generator 4-2 and a water lifting pipeline 4-3;

[0073] The water lifting pipeline 4-3 is used to guide the seawater in the high-level water storage tank 3-2 to the water turbine 4-1 to drive the water turbine 4-1 to rotate;

[0074] The water turbine 4-1 is used to drive the generator 4-2 to generate electricity;

[0075] Specifically, the water turbine power generation subsystem 4 is composed of a water turbine 4-1, a generator 4-2 and a water lifting pipeline 4-3; when the seawater in the high-level water storage tank 3-2 flows to the water turbine 4-1 through the water lifting pipeline 4-3, the water turbine 4-1 rotates, driving the generator 4-2 to generate electricity; the water turbine power generation subsystem 4 efficiently converts the gravitational potential energy of water into mechanical kinetic energy by the water turbine 4-1, and then converts the mechanical kinetic energy into electrical energy through the generator 4-2 to complete the entire energy conversion process;

[0076] It should be noted that assuming that the power generation power contributed by wind energy is Pwd = 10 MW and the power generation power contributed by wave energy is Pwv = 500 kW, and the wave energy collection subsystem 2 is installed in four directions with four pieces, the total power generation power is as follows:

[0077] P = Pwd + 4Pwv = 10 + 4 * 0.5 = 12 MW;

[0078] That is, the installed power of the water turbine 4-1 and the generator 4-2 should be at least able to meet the design requirements of 12 MW; in order to cope with possible power fluctuations and system uncertainties, a certain safety margin will be added, generally 10% to 20% margin. In this embodiment, a 20% safety margin is taken, then the installed power Prated capacity of the water turbine 4-1 and the generator 4-2 is as follows:

[0079] Prated = 12 MW × 1.20 = 14.4 MW.

[0080] See Figure 1 , in a preferred embodiment, the offshore power generation system combining wind energy and wave energy further includes: a wave parameter monitoring subsystem 10 and a communication subsystem 11;

[0081] The wave parameter monitoring subsystem 10 is used to obtain the rotational speed of the horizontal axis rotor 2-3; and based on the rotational speed and a preset rotational speed fitting coefficient, calculate the wave intensity data suffered by the offshore power generation system in each direction, and send the wave intensity data to the communication subsystem 11;

[0082] The communication subsystem 11 is used to calculate the wave intensity vector according to the constructed unit vector and the wave intensity data; and determine the propagation direction of the surface wave according to the wave intensity vector;

[0083] Specifically, the communication subsystem 11 is composed of a Beidou communication positioning unit 11-1, a single-chip microcomputer control unit 11-2 and related components 11-3;

[0084] The Beidou communication positioning unit 11-1 includes a Beidou positioning module 11-1-1, a Beidou short message module 11-1-2, a Beidou third-generation receiving antenna 11-1-3, a Beidou third-generation SIM card 11-1-4 and related circuits 11-1-5;

[0085] The single-chip microcomputer control unit 11-2 is composed of an STM32F407 single-chip microcomputer control board 11-2-1 and related modules 11-2-2, realizing remote monitoring and control of the system to ensure the stable operation of the device in the marine environment;

[0086] Schematically, by analyzing the wave intensity data in four directions of the offshore power generation system, the wave direction is determined accordingly;

[0087] Specifically, wave parameter monitoring subsystems 10 are arranged equidistantly in four directions (such as east, south, west, and north) of the offshore power generation system. Each wave parameter monitoring subsystem 10 records the rotational speed of the horizontal axis rotor 2-3. For each acquisition moment, according to the wave intensity data recorded in the four directions, denoted as IE (east), IS (south), IW (west), and IN (north), the wave direction is calculated using these wave intensity data. The wave direction can be represented in vector form; that is, the wave intensity data in each direction is regarded as the component of the vector, and a wave intensity vector is constructed. The unit vectors in each direction are set as follows: east (eE = (1, 0)), south (eS = (0, -1)), west (eW = (-1, 0)), north (eN = (0, 1)). Then, according to the constructed unit vectors and the wave intensity data, the wave intensity vector V is calculated. The direction of the wave intensity vector V is the propagation direction of the water surface wave. The specific calculation formula is as follows:

[0088] V = I E e E + I S e S + I W e W + I N e N ;

[0089] V = (I E - I W , I N - I S );

[0090]

[0091] In the formula, the angle θ represents the azimuth angle of the propagation direction, usually with the east direction as 0 degrees and increasing counterclockwise.

[0092] See Figure 1 , in a preferred embodiment, the wave parameter monitoring subsystem 10 includes: a plurality of wave position sensors 10-1 and a plurality of gyroscopes 10-2; each wave position sensor 10-1 includes a light source column 10-1-1 and a photosensitive column 10-1-2; the photosensitive column 10-1-2 includes a plurality of sensors 10-1-2-1;

[0093] The gyroscope 10-2 is used to sense the angle information of the wave position sensor 10-1 and send the angle information to the communication subsystem 11;

[0094] The light source column 10-1-1 is used to emit a plurality of infrared rays to the photosensitive column 10-1-2;

[0095] The photosensitive column 10-1-2 is used to send the position information of the sensor 10-1-2-1 that receives the weak infrared rays to the communication subsystem 11 after detecting weak infrared rays with a light intensity lower than a preset threshold;

[0096] The communication subsystem 11 is further configured to determine the wave height information according to the position information, the angle information, and a preset water level zero position;

[0097] See Figure 1 , in a preferred embodiment, each of the anti-collision vertical bars 9-2 is equipped with a wave position sensor 10-1 and a gyroscope 10-2;

[0098] Specifically, the wave position sensor 10-1 adopts the infrared beam vertical array method and is used to monitor parameters such as wave height, wave direction, and wave period in real time;

[0099] Schematically, as Figure 2 shown, is a schematic structural diagram of the wave position sensor 10-1 provided in this embodiment. The right side of the wave position sensor 10-1 is the light source column 10-1-1, and the left side is the photosensitive column 10-1-2;

[0100] In a preferred embodiment, the light source column 10-1-1 includes a plurality of infrared ray generators 10-1-1-1; the infrared ray generator 10-1-1-1 adopts a KY-008 laser module; each sensor 10-1-2-1 is composed of a photoresistor 10-1-2-1-1 and an LM393 dual voltage comparator integrated circuit 10-1-2-1-2;

[0101] Schematically, each wave position sensor 10-1 is composed of two vertical columns. One vertical column is the light source column 10-1-1, and the other vertical column is the photosensitive column 10-1-2; 200 infrared ray generators 10-1-1-1 are distributed on the light source column 10-1-1, and each infrared ray generator 10-1-1-1 on the light source column 10-1-1 corresponds to a sensor 10-1-2-1. That is, 200 sensors 10-1-2-1 are distributed on the photosensitive column 10-1-2. The infrared ray generators 10-1-1-1 are evenly distributed at intervals of 1 cm, and the sensors 10-1-2-1 are evenly distributed at intervals of 1 cm;

[0102] Specifically, the infrared ray generator 10-1-1-1 has a range of 2m, a spatial resolution of 1cm, adopts a KY-008 laser module, a rated voltage of 5v, and a light source wavelength of 650nm;

[0103] Specifically, the sensor 10-1-2-1 consists of a photoresistor 10-1-2-1-1 and an LM393 dual voltage comparator integrated circuit 10-1-2-1-2, with a rated voltage of 5V, adjustable sensitivity, and the output signal being a digital switch quantity (0 and 1).

[0104] Schematically, the light source column 10-1-1 emits infrared rays towards the photosensitive column through a column of infrared ray generators 10-1-1-1 arranged vertically at regular intervals. The gap between the light source column 10-1-1 and the photosensitive column 10-1-2 communicates with the water area; when the water surface is at a certain position within the measurement range, the water surface in the gap will cause the linear light passing through this surface to refract. The photosensitive column 10-1-2 can sense the relevant optical property changes (such as brightness), and after sensing the presence of weak infrared rays with a light intensity lower than the preset threshold, it will send the position information of the sensor 10-1-2-1 that receives the weak infrared rays to the communication subsystem 11;

[0105] It is recommended that the light source column 10-1-1 and the photosensitive column 10-1-2 be placed vertically, but they can also be placed obliquely, or even have a certain degree of irregular floating and swaying. Compensation and correction can be carried out through the gyroscope 10-2;

[0106] See Figure 3 , specifically, taking a certain wave position sensor 10-1 as an example. Number 200 groups of infrared ray generators 10-1-1-1 and sensors 10-1-2-1 sequentially from bottom to top to obtain N = 1, N = 2... N = 200 groups. The infrared ray generators 10-1-1-1 are normally open and keep emitting light continuously. When the water surface is at a certain position within the measurement range, the water surface in the gap causes the linear light passing through this surface to refract, and the light sensed by the corresponding Nth group of sensors 10-1-2-1 becomes weaker, sending a switch quantity signal to the communication subsystem 11. The latter receives this signal, calculates the corresponding measured height value l based on the value of N, then determines the compensation angle α according to the gyroscope 10-2 (i.e., the tilt angle measured by the gyroscope 10-2), and calculates h based on the measured height value l. The formula is as follows (unit: meter / m):

[0107]

[0108] In the above process, it is defaulted that the lowest end of the measurement range of the wave position sensor 10-1 is the zero point, and the h value is the height value of the current wave position relative to the zero point of the wave position sensor 10-1. At the same time, in actual operation, it is necessary to manually locate the position of the water level zero line and determine the height value h0 of the water level zero line relative to the zero point. In subsequent processing, the actual wave height information taken is H:

[0109] H = h - h0;

[0110] It should be noted that the light source column 10-1-1 can use linear light sources including but not limited to infrared light and visible light, or scattering light sources.

[0111] By setting the wave parameter monitoring subsystem 10, minute changes in the water surface can be accurately detected; moreover, the positions of the light source and the photosensitive element can be adjusted according to different situations.

[0112] Specifically, the wave height in the wave train of irregular waves has certain statistical characteristics. Due to the irregularity and randomness of the appearance waveform, currently, the "zero-upcrossing method" is mostly used to define the appearance waveform (apparent wave) and its elements; when determining the wave height of an irregular wave, it is first necessary to determine the water level zero line without the trend term. The intersection point where the fluctuating water level process line rises from the wave trough with the zero line is called the zero-upcrossing point, and the intersection point where it descends from the wave peak with the zero line is called the zero-downcrossing point. The waveform between two adjacent zero-upcrossing points is called an apparent wave, the distance between two adjacent zero-upcrossing points is called the period, and the vertical distance between the wave crest and the wave trough is called the wave height; in engineering, the apparent wave with wave height and period having certain probability characteristics is often used to characterize irregular waves, which is called the characteristic wave; the characteristic wave height is determined by the statistical distribution of the wave height in the irregular wave train; there are several commonly used characteristic wave heights, and here the mean value of the partial large wave heights is adopted, that is:

[0113] For example, if there is a wave height sequence H 1 ,H 2 ,...,H N , sorted by wave height, then the significant wave height H 13 can be calculated by the following formula (calculating the average wave height of the largest one-third waves in the wave height sequence, used to describe the average intensity of irregular waves):

[0114]

[0115] In the formula, N represents the total number of wave heights, and H i represents the wave height value in the sorted wave height sequence.

[0116] To determine the wave period, the wave position height data recorded in real time is required, from which the fluctuating water level process line is obtained. First, determine the water level zero line, that is, the horizontal line when the wave has no trend term. The intersection point where the fluctuating water level process line rises from the wave trough with the zero line is called the zero-upcrossing point, and the intersection point where it descends from the wave peak with the zero line is called the zero-downcrossing point. The time interval between two adjacent zero-upcrossing points is a wave period, and the wave period calculation formula is as follows:

[0117] Assume that the zero-upcrossing point time series in a certain wave band is t 1 ,t 2 ,...,t N , then each wave period T i can be expressed as:

[0118] T i = t i+1 - t i ;

[0119] Taking the average value of all wave periods, the average wave period T of this wave band can be obtained:

[0120]

[0121] If it is necessary to calculate the wave period of a certain characteristic wave, such as the significant wave period Te, the average value of the maximum one-third wave periods in a certain wave band can be taken:

[0122] T 1 / 3 is a form of the characteristic wave period, representing the average period of the one-third waves with the largest wave height, usually called the significant wave period. It is calculated by the mean of the first one-third periods of the wave period sequence. If there is a wave period sequence T 1 , T 2 ,..., T N and sorted by wave height, then the calculation formula for the significant wave period T 1 / 3 is as follows:

[0123]

[0124] In the formula, N represents the total number of the period sequence, T i represents the wave period value. Similar to the definition of the characteristic wave height, T 1 / 100 , T 1 / 10 are also commonly used.

[0125] Referring to Figure 5 , which is a method for generating electricity at sea by combining wind energy and wave energy provided by an embodiment of the present invention and applicable to the energy storage subsystem, including:

[0126] S1. Obtaining the seawater lifted by the wind energy collection subsystem and the seawater lifted by the wave energy collection subsystem; wherein, the seawater lifted by the wind energy collection subsystem is driven and lifted by the first water pump located in the wind energy collection subsystem; the seawater lifted by the wave energy collection subsystem is driven and lifted by the second water pump located in the wave energy collection subsystem;

[0127] S2. Storing the seawater lifted by the wind energy collection subsystem and the wave energy collection subsystem into the high-level water storage tank;

[0128] S3. When the pipeline valve is opened, discharge the seawater in the high-level reservoir into the water turbine power generation subsystem, so that the water turbine in the water turbine power generation subsystem drives the generator in the water turbine power generation subsystem to generate electricity under the drive of the discharged seawater.

[0129] The above is the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. An offshore power generation system combining wind energy and wave energy, characterized in that: include: A wind energy collection subsystem, a wave energy collection subsystem, an energy storage subsystem and a water turbine generating subsystem; the wind energy collection subsystem includes a first water pump; the wave energy collection subsystem includes a second water pump; the energy storage subsystem includes a pipeline valve and a high-level water storage tank; the water turbine generating subsystem includes a water turbine and a generator; The wind energy collection subsystem is used to capture wind energy from offshore waves and drive the first water pump to lift seawater into the energy storage subsystem through the wind energy; The wave energy collection subsystem is used to collect wave energy from surface waves and drive the second pumping pump to lift seawater into the energy storage subsystem through the wave energy; The energy storage subsystem is used to store the seawater lifted by the wind energy collection subsystem and the wave energy collection subsystem, and discharge the seawater in the high-level water storage tank into the turbine power generation subsystem when the pipeline valve is opened; The water turbine generating subsystem is used to drive the water turbine to rotate, so that the generator is driven by the water turbine to generate electricity; wherein the water turbine is driven to rotate by the seawater flowing into the energy storage subsystem.

2. The offshore power generation system combining wind energy and wave energy as claimed in claim 1, characterized in that: The wind energy collection subsystem includes a first water pump, horizontal axis fan blades, a first transmission shaft and a wind energy transmission belt; The horizontal axis fan blades are used to capture wind energy from offshore waves and transmit the wind energy to the first transmission shaft; The first transmission shaft is used to transmit the wind energy to the wind energy transmission belt, so that the wind energy transmission belt transmits the wind energy to the first water pump; The first water pump is used to lift seawater into the energy storage subsystem.

3. The offshore power generation system combining wind energy and wave energy as claimed in claim 1, characterized in that: The wave energy collection subsystem includes a second water pump, a wave collecting channel, a horizontal axis rotor, a second transmission shaft and a wave energy transmission belt; The wave collecting channel is used to collect wave energy of water surface waves and transmit the wave energy to the horizontal axis rotor to drive the horizontal axis rotor to rotate; The second transmission shaft is used to transmit the wave energy to the wave energy transmission belt after being driven by the rotating horizontal axis rotor; The wave energy transmission belt is used to transmit the wave energy to the second water pump to drive the second water pump to work, so that the seawater is lifted into the energy storage subsystem by the second water pump.

4. The offshore power generation system combining wind energy and wave energy as claimed in claim 1, characterized in that: The water turbine generator subsystem includes a water turbine, a generator and a water lifting pipeline; The water lifting pipeline is used to guide the seawater in the high-level water storage tank to the water turbine to drive the water turbine to rotate; The water turbine is used to drive the generator to generate electricity.

5. The offshore power generation system combining wind energy and wave energy as claimed in claim 3, characterized in that: Also includes: Wave parameter monitoring subsystem and communication subsystem; The wave parameter monitoring subsystem is used to obtain the rotation speed of the horizontal axis rotor; and based on the rotation speed and a preset rotation speed fitting coefficient, calculate the wave intensity data suffered by the offshore power generation system in each direction, and send the wave intensity data to the communication subsystem; The communication subsystem is used to calculate the wave intensity vector based on the constructed unit vector and the wave intensity data; and determine the propagation direction of the water surface waves based on the wave intensity vector.

6. The offshore power generation system combining wind energy and wave energy as claimed in claim 5, characterized in that: The wave parameter monitoring subsystem includes: a plurality of wave position sensors and a plurality of gyroscopes; each of the wave position sensors includes a light source array and a photosensitive array; the photosensitive array includes a plurality of sensors; The gyroscope is used to sense the angle information of the wave position sensor and send the angle information to the communication subsystem; The light source array is used to emit a plurality of infrared rays to the photosensitive array; The photosensitive array is used to send the position information of the sensor receiving the weak infrared ray to the communication subsystem after sensing the presence of weak infrared ray with light intensity lower than a preset threshold; The communication subsystem is also used to determine the wave height information based on the position information, the angle information and the preset water level zero line position.

7. The offshore power generation system combining wind energy and wave energy as claimed in claim 6, characterized in that: The light source array includes a plurality of infrared ray generators; the infrared ray generators use KY-008 laser modules; each of the sensors is composed of a photoresistor and an LM393 dual voltage comparator integrated circuit.

8. The offshore power generation system combining wind energy and wave energy as claimed in claim 7, characterized in that: Also includes: An upper platform, a lower platform, a plurality of piles and an anti-collision fence; the anti-collision fence includes an anti-collision horizontal fence and a plurality of anti-collision vertical fences; The upper platform and the lower platform are connected via the piles; the anti-collision fence is installed in a manner of surrounding the piles.

9. The offshore power generation system combining wind energy and wave energy as claimed in claim 8, characterized in that: Each of the anti-collision vertical barriers is equipped with a wave position sensor and a gyroscope.

10. A method for offshore power generation combining wind energy and wave energy, applicable to the energy storage subsystem, characterized in that: include: Acquire seawater lifted by the wind energy collection subsystem and seawater lifted by the wave energy collection subsystem; wherein the seawater lifted by the wind energy collection subsystem is lifted by a first water pump located in the wind energy collection subsystem; and the seawater lifted by the wave energy collection subsystem is lifted by a second water pump located in the wave energy collection subsystem; storing the seawater lifted up by the wind energy collection subsystem and the wave energy collection subsystem in a high-level water storage tank; When the pipeline valve is opened, the seawater in the high-level water reservoir is discharged into the water turbine generating subsystem, so that the turbine in the water turbine generating subsystem drives the generator in the water turbine generating subsystem to generate electricity under the drive of the discharged seawater.

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