An offshore wind power and wave energy combined power generation system and working method thereof

Abstract

The present invention discloses an offshore wind power and wave energy combined power generation system and a working method thereof, which belong to the technical field of offshore wind power and ocean wave energy power generation. The tower of the offshore wind turbine is connected to the offshore floating platform, and the offshore floating platform is fixed by a mooring system; the offshore floating platform includes a plurality of floats, and the upper and lower parts of the floats are connected by a hollow structure; the upper part of the float is hollow, and a wave energy power generation system is arranged inside. It fully utilizes the wind energy and wave energy in the area for power generation, has a wide range of applications, and a stable structure. The wave energy power generation system sets separate gas inlet and outlet channels, uses a one-way valve to ensure the independent operation of each channel at the same time, fully utilizes the inlet and outlet airflow, and converts the reciprocating motion of the airflow into the one-way rotation of the turbine. The equipment has a simple structure and low cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of offshore wind power and ocean wave energy power generation, and in particular relates to an offshore wind power and wave energy combined power generation system and a working method thereof. Background Art

[0002] At present, my country's offshore wind power is developing rapidly. The site selection of offshore wind farms requires a certain wind speed and strong wind force. Because the generation of wave energy itself comes from wind power, offshore wind farms are also places where wave energy resources are rich. Combining the development of offshore wind power with the utilization of wave energy resources can effectively expand the power generation capacity of offshore power plants and improve the overall economic efficiency of offshore power plants.

[0003] The common feature of offshore wind power and wave power generation is that wind and wave energy are more concentrated farther from the shore and deeper in the water. However, too great a depth is not conducive to the construction of a fixed foundation wind power platform. Therefore, people have proposed a floating foundation offshore wind power device. However, the floating foundation platform is easily affected by waves and has poor stability. Summary of the invention

[0004] In order to solve the above problems, the purpose of the present invention is to provide an offshore wind power and wave energy combined power generation system and its working method, which can comprehensively utilize the wind energy and wave energy in the area to generate electricity, has a wide range of applications and a stable structure.

[0005] The present invention is achieved through the following technical solutions:

[0006] The present invention discloses an offshore wind power and wave energy combined power generation system, comprising an offshore wind turbine and an offshore floating platform, wherein the tower of the offshore wind turbine is connected to the offshore floating platform, and the offshore floating platform is fixed by a mooring system; the offshore floating platform comprises a plurality of floats, the upper and lower parts of the floats are connected by a hollow structure; the upper part of the float is hollow, and a wave energy power generation system is arranged inside;

[0007] The wave energy power generation system comprises a cavity, an air inlet pipe section I, an air outlet pipe section I, a turbine, a generator, a turbine chamber, an air inlet pipe section II and an air outlet pipe section II; the lower end of the cavity is open and connected to the hollow structure of the float; the upper end of the cavity is provided with an air inlet and an air outlet, the air inlet and an air outlet are connected to the air inlet pipe section I and the air outlet pipe section I, the air inlet pipe section I and the air outlet pipe section I are connected to one side of the turbine chamber, and the other side of the turbine chamber is connected to the air inlet pipe section II and the air outlet pipe section II; an air inlet check valve is provided in the air inlet pipe section I, an air outlet check valve is provided in the air outlet pipe section II, the air inlet pipe section II and the air outlet pipe section II are connected to the outside; the turbine is provided in the turbine chamber, the turbine is connected to the generator, and the turbine rotates unidirectionally under the action of the reciprocating airflow.

[0008] Preferably, the inner wall of the turbine chamber is a continuous curved surface.

[0009] Preferably, the volume of the cavity gradually decreases from the middle to the air inlet and outlet.

[0010] Further preferably, the air inlet and outlet are arranged at the center of the top of the cavity.

[0011] Preferably, the diameter of the air inlet pipe section II gradually expands from the inside to the outside, and the diameter of the air outlet pipe section II gradually shrinks from the inside to the outside.

[0012] Preferably, the air inlet and outlet are connected to the air inlet pipe section I and the air outlet pipe section I by using bent pipes.

[0013] Preferably, the offshore floating platform further comprises a central support platform and a bracket, a plurality of floats are arranged around the central support platform, the floats are connected to the central support platform through the bracket, and the tower of the offshore wind turbine is connected to the central support platform.

[0014] Further preferably, the number of the floats is 3, which are distributed on the three vertices of an equilateral triangle, and the bracket includes a plurality of horizontal branch pipes and a plurality of inclined pipes.

[0015] Preferably, the float is a cylinder.

[0016] The working method of the above-mentioned offshore wind power and wave energy combined power generation system disclosed in the present invention comprises:

[0017] The offshore floating platform is fixed on the sea surface by a mooring system, and the offshore wind turbine generates electricity using offshore wind energy; the wave energy power generation system in the float generates electricity using wave energy: the waves excite the water surface in the cavity to oscillate up and down. When the water surface moves upward, the gas in the cavity is squeezed by the water surface, enters the outlet pipe section I from the air inlet and outlet, and then enters the turbine chamber to drive the turbine to rotate. The turbine drives the generator to rotate and generate electricity, and then the gas is discharged from the outlet pipe section II after passing through the outlet one-way valve; when the water surface moves downward, the air pressure in the cavity decreases, and the external gas enters the turbine chamber from the inlet pipe section II under the action of atmospheric pressure, drives the turbine to rotate and then drives the generator to rotate and generate electricity, and then the gas enters the inlet pipe section I through the inlet one-way valve and enters the cavity from the inlet and outlet; the turbine rotates unidirectionally under the action of reciprocating airflow, and the wave energy power generation system and the offshore wind turbine generate electricity together.

[0018] Compared with the prior art, the present invention has the following beneficial technical effects:

[0019] The invention discloses an offshore wind power and wave power combined power generation system, which combines offshore wind power with a wave power generation device, shares an offshore wind power platform, improves the overall power generation power of the device, increases the power generation and effective working hours. The offshore wind power is combined with the wave power generation device, and the offshore wind power platform can be shared. The construction cost is less than that required for the separate construction of the two power generation devices, which reduces the construction cost and facilitates the daily inspection and maintenance of the staff. Compared with the fixed foundation device, it has a wider range of applications and can make full use of the offshore wind and wave energy resources in the near and far seas. Compared with the traditional wave power generation device, the oscillating water column wave power generation device has a very simple structure, and the main equipment is placed above the sea surface, with low requirements for sealing and anti-corrosion, and is convenient for maintenance; although the total power of the wave power generation device is small, it can meet the power demand of the device itself, reducing the later operation and maintenance and power consumption costs. The oscillating water column wave power generation device performs damping motion under the action of the waves, which can absorb the impact of the waves on the power generation platform. Under the same wave height, it is more stable than the general floating offshore wind power platform.

[0020] The upper part of the float is hollow, providing space for the arrangement of the wave energy power generation system. The hollow structure provides a channel for the waves to enter and exit. The lower part is the main body that provides buoyancy, and the structure is stable. The wave energy power generation system is located on the upper part of the float, with good sealing and low anti-corrosion cost. The wave energy power generation system sets up separate gas inlet and outlet channels and uses a one-way valve to ensure that each channel works independently at the same time, making full use of the inlet and outlet airflow, converting the reciprocating motion of the airflow into the one-way rotation of the turbine. The equipment has a simple structure and low cost.

[0021] Furthermore, the inner wall of the turbine chamber is a continuous curved surface, which can ensure the continuous flow of gas and improve work efficiency.

[0022] Furthermore, the volume of the cavity gradually decreases from the middle to the gas inlet and outlet, which can increase the gas flow rate and thus improve the power generation efficiency.

[0023] Furthermore, the gas inlet and outlet are arranged at the center of the top of the cavity, which can improve the efficiency of gas inlet and outlet.

[0024] Furthermore, the diameter of the air inlet pipe section II gradually expands from the inside to the outside, and the diameter of the air outlet pipe section II gradually shrinks from the inside to the outside, which can increase the flow rate of the intake and exhaust and improve the efficiency of the system.

[0025] Furthermore, the air inlet and outlet are connected with the air inlet pipe section I and the air outlet pipe section I by using bent pipes to ensure smooth flow of gas.

[0026] Furthermore, the central support of the offshore floating platform is connected to the surrounding floats through a bracket. The central support is used to connect the tower of the offshore wind turbine. The construction is simple, the structure is balanced and stable, and the weight is light.

[0027] Furthermore, the floats are distributed in an equilateral triangle shape, and the structure is stable.

[0028] Furthermore, the float is a cylinder with a stable structure and good stability in water.

[0029] The working method of the above-mentioned offshore wind power and wave energy combined power generation system disclosed in the present invention fully utilizes the wind energy and wave energy in the region, has a high degree of automation and good economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0031] Figure 2 A schematic top view of an offshore floating platform;

[0032] Figure 3 It is a structural schematic diagram of a wave energy power generation system;

[0033] Figure 4 It is a schematic diagram of the working principle of the present invention.

[0034] In the figure: 1 is an offshore wind turbine, 2 is an offshore floating platform, 2-1 is a floater, 2-2 is a central support, 2-3 is a bracket, 3 is a wave energy power generation system, 3-1 is a cavity, 3-2 is an air inlet and outlet, 3-3 is an air inlet pipe section I, 3-4 is an air outlet pipe section I, 3-5 is an air inlet check valve, 3-6 is an air outlet check valve, 3-7 is a turbine, 3-8 is a generator, 3-9 is a turbine chamber, 3-10 is an air inlet pipe section II, 3-11 is an air outlet pipe section II, 4 is a mooring system, and 5 is a control system. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below in conjunction with the accompanying drawings, the contents of which are intended to explain the present invention rather than to limit it:

[0036] like Figure 1 , is an offshore wind power and wave energy combined power generation system of the present invention, comprising an offshore wind turbine 1 and an offshore floating platform 2, wherein the tower of the offshore wind turbine 1 is connected to the offshore floating platform 2, and the offshore floating platform 2 is fixed by a mooring system 4; the offshore floating platform 2 comprises a plurality of floats 2-1, wherein the upper and lower parts of the floats 2-1 are connected by a hollow structure; the upper part of the float 2-1 is hollow, and a wave energy power generation system 3 is arranged inside.

[0037] The wave energy power generation system 3 comprises a cavity 3-1, an air inlet pipe section I 3-3, an air outlet pipe section I 3-4, a turbine 3-7, a generator 3-8, a turbine chamber 3-9, an air inlet pipe section II 3-10 and an air outlet pipe section II 3-11; the lower end of the cavity 3-1 is open and communicated with the hollow structure of the float 2-1; the upper end of the cavity 3-1 is provided with an air inlet and outlet 3-2, the air inlet and outlet 3-2 are connected to the air inlet pipe section I 3-3 and the air outlet pipe section I 3-4, and the air inlet pipe section I 3-3 and the air outlet pipe section I 3-4 are connected to one side of the turbine chamber 3-9 The other side of the turbine chamber 3-9 is connected to the intake pipe section II 3-10 and the outlet pipe section II 3-11; an intake check valve 3-5 is provided in the intake pipe section I 3-3, and an outlet check valve 3-6 is provided in the outlet pipe section II 3-11, and the intake pipe section II 3-10 and the outlet pipe section II 3-11 are connected to the outside; the turbine 3-7 is arranged in the turbine chamber 3-9, and the inner wall of the turbine chamber 3-9 preferably adopts a continuous curved surface. The turbine 3-7 is connected to the generator 3-8, and the turbine 3-7 rotates unidirectionally under the action of the reciprocating airflow.

[0038] In a preferred embodiment of the present invention, the volume of the cavity 3-1 gradually decreases from the middle to the air inlet and outlet 3-2, forming an inverted funnel shape, and the air inlet and outlet 3-2 are located at the center of the top of the cavity 3-1, that is, the mouth of the funnel.

[0039] In a preferred embodiment of the present invention, the diameter of the air inlet pipe section II 3-10 gradually expands from inside to outside, and the diameter of the air outlet pipe section II 3-11 gradually decreases from inside to outside. The air inlet and outlet 3-2 are connected with the air inlet pipe section I 3-3 and the air outlet pipe section I 3-4 by using elbow pipes.

[0040] like Figure 2 In a preferred embodiment of the present invention, the offshore floating platform 2 further includes a central support 2-2 and a bracket 2-3. A plurality of cylindrical floaters 2-1 are arranged around the central support 2-2. The floaters 2-1 are connected to the central support 2-2 through the bracket 2-3. The tower of the offshore wind turbine 1 is connected to the central support 2-2. The number of floaters 2-1 is 3, distributed on the three vertices of an equilateral triangle. The bracket 2-3 includes a plurality of horizontal branch pipes and a plurality of inclined pipes. The bracket 2-3 is used to lay pipelines and wires.

[0041] like Figure 3 In one embodiment of the present invention, the outlet pipe section I 3-4 and the outlet pipe section II 3-11 are arranged above the inlet pipe section I 3-3 and the inlet pipe section II 3-10. The inlet pipe section I 3-3 and the inlet pipe section II 3-10 can also be arranged above the outlet pipe section I 3-4 and the outlet pipe section II 3-11; similarly, the outlet pipe section I 3-4 and the outlet pipe section II 3-11, the inlet pipe section I 3-3 and the inlet pipe section II 3-10 can also be arranged horizontally and in parallel.

[0042] The working method of the above-mentioned offshore wind power and wave energy combined power generation system includes:

[0043] The offshore floating platform 2 is fixed on the sea surface through a mooring system 4, and the offshore wind turbine 1 generates electricity using offshore wind energy;

[0044] like Figure 4 The wave energy power generation system 3 in the float 2-1 generates electricity using wave energy: the wave excites the water surface in the cavity 3-1 to oscillate up and down. When the water surface moves upward, the gas in the cavity 3-1 is squeezed by the water surface, enters the outlet pipe section I 3-4 from the air inlet and outlet 3-2, and then enters the turbine chamber 3-9 to drive the turbine 3-7 to rotate, and the turbine 3-7 drives the generator 3-8 to rotate and generate electricity, and then the gas passes through the outlet check valve 3-6 and is discharged from the outlet pipe section II 3-11; when the water surface moves downward, the air pressure in the cavity 3-1 decreases, and the external gas enters the turbine chamber 3-9 from the air inlet pipe section II 3-10 under the action of atmospheric pressure, drives the turbine 3-7 to rotate and then drives the generator 3-8 to rotate and generate electricity, and then the gas enters the air inlet pipe section I 3-3 through the air inlet and outlet 3-2 and enters the cavity 3-1; the turbine 3-7 rotates unidirectionally under the action of the reciprocating airflow, and the wave energy power generation system 3 and the offshore wind turbine 1 generate electricity together.

[0045] The electricity generated by the offshore wind turbine 1 and the wave energy power generation system 3 is regulated by the control system 5 installed inside the central support 2-2 and then transmitted to the power grid, or stored in the energy storage system. The control system 5 can use the mature regulation and transmission system in the offshore wind power system to invert the electricity generated by the device and transmit it after converting it into direct current. There is no need to add a large amount of equipment, which is easy to construct. At the same time, when the wave energy power generation system 3 is not needed to generate electricity temporarily, the control system 5 can control the turbine 3-7 and the generator 3-8 to be disconnected, and then control the connection between the two when the wave energy part is needed to work.

[0046] The above is only part of the embodiments of the present invention. Although some terms are used in the present invention, the possibility of using other terms is not excluded. The use of these terms is only for the convenience of describing and explaining the essence of the present invention. It is contrary to the spirit of the present invention to interpret them as any additional restrictions. The above is only to further illustrate the content of the present invention with examples for easier understanding, but it does not mean that the embodiments of the present invention are limited to this. Any technical extension or re-creation made according to the present invention is protected by the present invention.

Claims

1. An offshore wind power and wave power combined power generation system, characterized in that: The invention comprises an offshore wind turbine (1) and an offshore floating platform (2), wherein the tower of the offshore wind turbine (1) is connected to the offshore floating platform (2), and the offshore floating platform (2) is fixed by a mooring system (4); the offshore floating platform (2) comprises a plurality of floaters (2-1), and the upper and lower parts of the floaters (2-1) are connected by a hollow structure; the upper part of the floater (2-1) is hollow, and a wave energy power generation system (3) is arranged inside; The wave energy power generation system (3) comprises a cavity (3-1), an air inlet pipe section I (3-3), an air outlet pipe section I (3-4), a turbine (3-7), a generator (3-8), a turbine chamber (3-9), an air inlet pipe section II (3-10) and an air outlet pipe section II (3-11); the lower end of the cavity (3-1) is open and communicates with the hollow structure of the float (2-1); an air inlet and outlet (3-2) is provided at the upper end of the cavity (3-1), the air inlet and outlet (3-2) is connected to the air inlet pipe section I (3-3) and the air outlet pipe section I (3-4), and the air inlet pipe section I (3-3) and the air outlet pipe section I (3-11) are connected to the air inlet pipe section I (3-3) and the air outlet pipe section I (3-11). 4) is connected to one side of the turbine chamber (3-9), and the other side of the turbine chamber (3-9) is connected to the inlet pipe section II (3-10) and the outlet pipe section II (3-11); an inlet check valve (3-5) is provided in the inlet pipe section I (3-3), and an outlet check valve (3-6) is provided in the outlet pipe section II (3-11); the inlet pipe section II (3-10) and the outlet pipe section II (3-11) are connected to the outside; the turbine (3-7) is provided in the turbine chamber (3-9), the turbine (3-7) is connected to the generator (3-8), and the turbine (3-7) rotates unidirectionally under the action of the reciprocating airflow; The volume of the cavity (3-1) gradually decreases from the middle to the air inlet and outlet (3-2); The air inlet and outlet (3-2) are arranged at the center of the top of the cavity (3-1); The diameter of the air inlet pipe section II (3-10) gradually expands from the inside to the outside, and the diameter of the air outlet pipe section II (3-11) gradually decreases from the inside to the outside; The offshore floating platform (2) also includes a central support platform (2-2) and a bracket (2-3); a plurality of floaters (2-1) are arranged around the central support platform (2-2); the floaters (2-1) are connected to the central support platform (2-2) via the bracket (2-3); and the tower of the offshore wind turbine (1) is connected to the central support platform (2-2); The number of floats (2-1) is 3, which are distributed on the three vertices of an equilateral triangle. The support (2-3) includes a plurality of horizontal branch pipes and a plurality of inclined pipes.

2. The offshore wind power and wave energy combined power generation system according to claim 1, characterized in that: The inner wall of the turbine chamber (3-9) is a continuous curved surface.

3. The offshore wind power and wave energy combined power generation system according to claim 1, characterized in that: The air inlet and outlet (3-2) are connected to the air inlet pipe section I (3-3) and the air outlet pipe section I (3-4) by using bent pipes.

4. The offshore wind power and wave energy combined power generation system according to claim 1, characterized in that: The float (2-1) is a cylinder.

5. The working method of the offshore wind power and wave energy combined power generation system according to any one of claims 1 to 4, characterized in that: include: The offshore floating platform (2) is fixed on the sea surface via a mooring system (4), and the offshore wind turbine (1) generates electricity using offshore wind energy; The wave energy power generation system (3) in the float (2-1) generates electricity using wave energy: the waves excite the water surface in the cavity (3-1) to oscillate up and down. When the water surface moves upward, the gas in the cavity (3-1) is squeezed by the water surface and enters the outlet pipe section I (3-4) from the air inlet and outlet (3-2) and then enters the turbine chamber (3-9) to drive the turbine (3-7) to rotate. The turbine (3-7) drives the generator (3-8) to rotate to generate electricity. Then, the gas passes through the outlet check valve ( When the water surface moves downward, the air pressure in the cavity (3-1) decreases, and the external gas enters the turbine chamber (3-9) from the air inlet section (3-10) under the action of atmospheric pressure, driving the turbine (3-7) to rotate and then driving the generator (3-8) to rotate and generate electricity. Then, the gas enters the air inlet section (3-3) through the air inlet check valve (3-5) and enters the cavity (3-1) from the air inlet and outlet (3-2); The turbine (3-7) rotates unidirectionally under the action of the reciprocating airflow, and the wave energy power generation system (3) and the offshore wind turbine (1) generate electricity together.

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