Oscillating water column type wave power generation device and method

Abstract

The invention provides an oscillating water column type wave energy power generation device and method, and relates to the technical field of new energy power generation. The characteristic that the permanent magnet synchronous generator can be converted between a power generation mode and a motor mode is utilized, the Wills turbine, the permanent magnet synchronous generator and the power storage device are combined, and the Wills turbine drives the permanent magnet synchronous generator to generate alternating current electric energy during power generation. The electrical storage device converts alternating-current electric energy generated by the permanent magnet synchronous generator into direct-current electric energy and stores the direct-current electric energy, the electrical storage device can supply power to the permanent magnet synchronous generator before power generation, the permanent magnet synchronous generator can drive the Wills turbine to rotate, and therefore the initial speed is provided for the Wills turbine; therefore, the starting process of the Wills turbine can be accelerated during subsequent power generation, the time consumed by the Wills turbine to reach the rated rotating speed after the Wills turbine is started is shortened, the Wills turbine can operate at the rated rotating speed for a longer time, and the working efficiency of the wave energy power generation device is improved.

Description

Technical Field

[0001] The present application relates to the field of renewable energy power generation technology, and in particular to an oscillating water column type wave energy power generation device and method. Background Art

[0002] New energy power generation is a technology that uses renewable energy (such as solar energy, biomass energy, wind energy, geothermal energy, wave energy, ocean current energy and tidal energy, etc.) to generate electricity. As one of the most promising renewable energy sources, wave energy has gradually attracted people's attention, and many countries have actively carried out the research and development of wave energy power generation devices. Generally, there are many types of wave energy power generation devices, such as point absorption type, overpass type, oscillating water column type, oscillating float type, etc. Among them, the oscillating water column type has many advantages such as relatively simple structure, high reliability, wide range of application, etc., and is also the most widely used.

[0003] In the related art, the oscillating water column wave energy power generation device mainly includes an air chamber, a turbine and a generator. The lower part of the air chamber is immersed under the water surface. After the wave enters the air chamber, the water level in the air chamber will rise and fall with the rise and fall of the wave. When the water level rises at the peak of the wave, the air pressure in the air chamber increases, and the air flows from the air chamber to the turbine. When the water level drops at the trough of the wave, the air pressure in the air chamber decreases, and the air flows from the turbine to the air chamber. This two-way reciprocating flow of air will drive the turbine to rotate and do work, so that the turbine can drive the generator to generate electricity. However, in order to meet the requirement that the blades of the turbine rotate in the same direction under the action of the two-way airflow, the turbine usually adopts a Wells turbine, and the Wells turbine has poor self-starting ability, and it takes a long time to reach the rated speed after starting. The speed during operation is often lower than the rated speed, thereby reducing the working efficiency of the power generation device. Summary of the invention

[0004] The present application provides an oscillating water column wave energy power generation device and method, aiming to solve the problem of low working efficiency of the wave energy power generation device using Wells turbine in the related art.

[0005] In order to solve the above-mentioned drawbacks existing in the relevant technology, the first aspect of the present application provides an oscillating water column wave energy power generation device, which includes an air chamber, a first turbine chamber, a power generation chamber, a Wells turbine, a permanent magnet synchronous generator and a power storage device. A first air flow channel is formed between the upper part of the air chamber and the first turbine chamber, and a first channel switch is provided in the first air flow channel. The lower part of the air chamber is located in the sea water, and a water inlet for sea water to enter and exit the air chamber is opened in the lower part of the air chamber. The Wells turbine is arranged in the first turbine chamber, and the permanent magnet synchronous generator and the power storage device are both arranged in the power generation chamber. The Wells turbine is mechanically connected to the permanent magnet synchronous generator, and the permanent magnet synchronous generator is electrically connected to the power storage device. The permanent magnet synchronous generator has a power generation mode and a motor mode, and the wave energy power generation device has a low airflow operation mode. Specifically, in the low airflow operation mode: the first airflow channel is used to connect the air chamber and the first turbine chamber when the first channel switch is turned on, or to isolate the air chamber and the first turbine chamber when the first channel switch is closed; the permanent magnet synchronous generator is used to be in motor mode before the first channel switch is turned on, or in power generation mode after the first channel switch is turned on; before the first channel switch is turned on, the power storage device is used to convert the DC power stored in itself into AC power and transmit it to the permanent magnet synchronous generator, and the permanent magnet synchronous generator is used to drive the Wells turbine based on the AC power to provide an initial velocity for the Wells turbine; after the first channel switch is turned on, the Wells turbine is used to drive the permanent magnet synchronous generator based on the air reciprocating between the air chamber and the first turbine chamber, and the permanent magnet synchronous generator is used to generate AC power under the drive of the Wells turbine, and the power storage device is used to convert the AC power into DC power and store it.

[0006] In some implementation schemes, the oscillating water column wave energy power generation device also includes a second turbine chamber and an impulse turbine, a second airflow channel is formed between the upper part of the air chamber and the second turbine chamber, a second channel switch is provided in the second airflow channel, the impulse turbine is arranged in the second turbine chamber and mechanically connected to the permanent magnet synchronous generator, and the wave energy power generation device also has a high airflow operation mode. Specifically, in the high airflow operation mode: the second airflow channel is used to connect the air chamber and the second turbine chamber when the second channel switch is turned on, or to separate the air chamber and the second turbine chamber when the second channel switch is turned off; the permanent magnet synchronous generator is used to always be in the power generation mode; after the second channel switch is turned on, the impulse turbine is used to drive the permanent magnet synchronous generator based on the air reciprocating between the air chamber and the second turbine chamber, the permanent magnet synchronous generator is used to generate AC power under the drive of the impulse turbine, and the power storage device is used to convert the AC power into DC power and store the converted DC power.

[0007] In some implementations, the first channel switch and the second channel switch each include any one of a mechanical valve, a solenoid valve, and a pneumatic valve.

[0008] In some implementations, the oscillating water column wave energy power generation device further includes a control device, and the permanent magnet synchronous generator, the first channel switch, and the second channel switch are respectively communicatively connected to the control device. Specifically, the control device is used to: control the first channel switch to be turned on or off; control the permanent magnet synchronous generator to switch between the motor mode and the power generation mode; control the second channel switch to be turned on or off; and control the wave energy power generation device to switch between the low airflow operation mode and the high airflow operation mode.

[0009] In some implementations, the oscillating water column wave energy power generation device further includes a gas flow detector disposed in the air chamber, and the gas flow detector is communicatively connected to the control device. Based on this, the gas flow detector is used to detect the gas flow data in the air chamber in real time; the control device is specifically used to determine whether the gas flow data is less than or equal to a preset gas flow threshold, and when the gas flow data is less than or equal to the preset gas flow threshold, the wave energy power generation device is set to a low gas flow operation mode, or when the gas flow data is greater than the preset gas flow threshold, the wave energy power generation device is set to a high gas flow operation mode.

[0010] In some implementations, the power storage device includes an energy converter and an energy storage device, the permanent magnet synchronous generator is electrically connected to the energy converter, and the energy converter is electrically connected to the energy storage device. Specifically, the energy converter is used to convert the AC power generated by the permanent magnet synchronous generator into DC power, and transmit the DC power to the energy storage device; the energy storage device is used to store the DC power from the energy converter, or transmit the DC power stored in itself to the energy converter before the first channel switch is turned on; the energy converter is also used to convert the DC power from the energy storage device into AC power before the first channel switch is turned on, and transmit it to the permanent magnet synchronous generator, so that the permanent magnet synchronous generator drives the Wells turbine, so that the Wells turbine obtains the initial speed.

[0011] In some implementations, the power converter includes a converter and a filter, the converter is electrically connected to the filter, the converter is electrically connected to the permanent magnet synchronous generator, and the filter is electrically connected to the power storage. Specifically, the converter is used to convert the AC power generated by the permanent magnet synchronous generator into DC power and transmit the DC power to the filter, or before the first channel switch is turned on, convert the DC power from the power storage into AC power and transmit it to the permanent magnet synchronous generator so that the permanent magnet synchronous generator drives the Wells turbine; the filter is used to filter the DC power from the converter and transmit the filtered DC power to the power storage.

[0012] In some implementations, the power converter also includes a voltage stabilizer, the filter is electrically connected to the voltage stabilizer, the voltage stabilizer is electrically connected to the power storage device, the voltage stabilizer is used to stabilize the DC power from the filter and transmit the stabilized DC power to the power storage device.

[0013] In some implementations, the electrical energy storage includes a single battery; or, the electrical energy storage includes a battery pack consisting of a plurality of batteries.

[0014] In some implementation schemes, the wave energy power generation device also includes a transformer room and a transformer device, the transformer device is arranged in the transformer room, the power storage device is electrically connected to the transformer device, and the transformer device is used to electrically connect to the power grid so as to convert the DC power from the power storage device into AC power and input it into the power grid.

[0015] In some implementations, the power conversion device includes an inverter and a transformer that are electrically connected, the power storage device is electrically connected to the inverter, and the transformer is used to electrically connect to the power grid. Specifically, the inverter is used to convert the DC power from the power storage device into AC power and transmit it to the transformer; the transformer is used to boost the AC power from the inverter and input the boosted AC power into the power grid.

[0016] The second aspect of the present application provides an oscillating water column wave energy power generation method, which is applied to the oscillating water column wave energy power generation device provided in the first aspect of the present application, and comprises: in a low airflow operation mode, setting the permanent magnet synchronous generator to a motor mode; the power storage device converts the DC power stored in itself into AC power and transmits it to the permanent magnet synchronous generator, so that the permanent magnet synchronous generator drives the Wells turbine to obtain an initial velocity; opening the first channel switch, and setting the permanent magnet synchronous generator to a power generation mode; the Wells turbine drives the permanent magnet synchronous generator based on the air reciprocatingly flowing between the air chamber and the first turbine chamber, so that the permanent magnet synchronous generator generates AC power; the power storage device converts the AC power from the permanent magnet synchronous generator into DC power and stores it.

[0017] In some implementation schemes, the oscillating water column wave energy power generation method also includes: in a high airflow operation mode, setting the permanent magnet synchronous generator to a power generation mode; closing the first channel switch and opening the second channel switch; the impulse turbine drives the permanent magnet synchronous generator based on the reciprocating air flow between the air chamber and the second turbine chamber, so that the permanent magnet synchronous generator generates AC power; the power storage device converts the AC power from the permanent magnet synchronous generator into DC power and stores the DC power.

[0018] In some implementation schemes, the oscillating water column wave energy power generation method also includes: a gas flow detector detects the air flow data in the air chamber in real time; a control device determines whether the air flow data is less than or equal to a preset air flow threshold; when the air flow data is less than or equal to the preset air flow threshold, the control device sets the wave energy power generation device to a low air flow operation mode; when the air flow data is greater than the preset air flow threshold, the control device sets the wave energy power generation device to a high air flow operation mode.

[0019] The oscillating water column wave energy power generation device provided in the first aspect of the present application has a low airflow operation mode and is composed of an air chamber, a first turbine chamber, a power generation chamber, a Wells turbine, a permanent magnet synchronous generator and a power storage device. The permanent magnet synchronous generator has a power generation mode and a motor mode. A first airflow channel is formed between the upper part of the air chamber and the first turbine chamber. A first channel switch is arranged in the first airflow channel. The lower part of the air chamber is immersed in seawater. A water inlet for seawater to enter and exit the air chamber is opened in the lower part of the air chamber. The Wells turbine is arranged in the first turbine chamber, and the permanent magnet synchronous generator and the power storage device are both arranged in the power generation chamber. The Wells turbine is mechanically connected to the permanent magnet synchronous generator, and the permanent magnet synchronous generator is electrically connected to the power storage device. In actual applications, when the wave energy power generation device is in the low airflow operation mode, the first channel switch is first closed to isolate the air chamber from the first turbine chamber, and the permanent magnet synchronous generator is set to the motor mode. The power storage device will convert the DC power stored in itself into AC power and transmit it to the permanent magnet synchronous generator. The permanent magnet synchronous generator will drive the Wells turbine under the energy supply of the power storage device, thereby providing the initial velocity for the Wells turbine; then, the first channel switch is opened to connect the air chamber with the first turbine chamber, and the permanent magnet synchronous generator is set to the power generation mode. The Wells turbine will drive the permanent magnet synchronous generator based on the reciprocating air flow between the air chamber and the first turbine chamber. The permanent magnet synchronous generator will generate AC power under the drive of the Wells turbine, and the power storage device can convert the AC power from the permanent magnet synchronous generator into DC power and store it. From this, it can be found that the present application utilizes the characteristic that the permanent magnet synchronous generator can be switched between the power generation mode and the motor mode, and combines the Wells turbine, the permanent magnet synchronous generator and the power storage device. When generating electricity, the Wells turbine drives the permanent magnet synchronous generator to generate AC electricity, and the power storage device converts the AC electricity generated by the permanent magnet synchronous generator into DC electricity and stores it. Before generating electricity, the power storage device will power the permanent magnet synchronous generator, and the permanent magnet synchronous generator will drive the Wells turbine to rotate, which provides the Wells turbine with an initial speed. In this way, the starting process of the Wells turbine can be accelerated during subsequent power generation, and the time consumed by the Wells turbine to reach the rated speed after starting can be shortened, so that the Wells turbine can run at the rated speed for a longer time, thereby improving the working efficiency of the wave energy power generation device.

[0020] The oscillating water column type wave energy power generation method provided in the second aspect of the present application is applied to the oscillating water column type wave energy power generation device provided in the first aspect of the present application, that is, it is implemented based on the oscillating water column type wave energy power generation device provided in the first aspect of the present application, so it has all the advantages of the oscillating water column type wave energy power generation device provided in the first aspect of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the related technologies or the embodiments of the present application, the drawings required for use in the description of the related technologies or the embodiments of the present application will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, not all embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of the structure of a wave energy power generation device provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of the process of low airflow wave energy power generation method provided in an embodiment of the present application;

[0024] Figure 3 A schematic diagram of the process of high airflow wave energy power generation method provided in an embodiment of the present application;

[0025] Figure 4 A schematic diagram of the process flow for switching between low and high airflow operation modes provided in an embodiment of the present application.

[0026] The symbols in the above drawings represent:

[0027] 1-air chamber, 2-first turbine chamber, 3-second turbine chamber, 4-generator chamber, 5-substation chamber, 6-Wells turbine, 7-permanent magnet synchronous generator, 8-power storage device, 9-impulse turbine, 10-substation device, 11-water inlet, 81-electric energy converter, 82-electric energy storage device. DETAILED DESCRIPTION

[0028] In the related art, the oscillating water column wave energy power generation device mainly includes an air chamber, a turbine and a generator. The turbine is usually a Wells turbine, and the Wells turbine has obvious disadvantages: poor self-starting ability, a long time to reach the rated speed after starting, and the speed during operation is often lower than the rated speed, thereby reducing the working efficiency of the power generation device; the working range is small, the suitable operating range is limited, and the pressure / airflow is too large during operation, which can easily cause the blades to stall, thereby reducing the power generation capacity of the power generation device. In view of this, the present application proposes an oscillating water column wave energy power generation device and method in the following embodiments to solve the above-mentioned disadvantages in the related art.

[0029] In order to make the purpose, technical solutions and advantages of the present application more obvious and easy to understand, the present application will be clearly and completely described below in conjunction with the embodiments of the present application and the corresponding drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. It should be understood that the embodiments of the present application described below are only used to explain the present application and are not used to limit the present application, that is, based on the embodiments of the present application, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0030] See also Figure 1 , Figure 1 : is a structural schematic diagram of a wave energy power generation device. This embodiment provides an oscillating water column type wave energy power generation device, which includes an air chamber 1, a first turbine chamber 2, a power generation chamber 4, a Wells turbine 6, a permanent magnet synchronous generator 7 and a power storage device 8. A first airflow channel (not shown) is formed between the upper part of the air chamber 1 and the first turbine chamber 2, and a first channel switch (not shown) is provided in the first airflow channel. The lower part of the air chamber 1 is immersed in seawater, and a water inlet 11 for seawater to enter and exit the air chamber 1 is provided in the lower part of the air chamber 1. The Wells turbine 6 is arranged in the first turbine chamber 2, and the permanent magnet synchronous generator 7 and the power storage device 8 are both arranged in the power generation chamber 4. The Wells turbine 6 is mechanically connected to the permanent magnet synchronous generator 7, and the permanent magnet synchronous generator 7 is electrically connected to the power storage device 8. The permanent magnet synchronous generator 7 has a power generation mode and a motor mode. The wave energy power generation device has a low airflow operation mode and a high airflow operation mode. The low airflow operation mode refers to an operation mode when the airflow in the air chamber 1 is relatively small, and the high airflow operation mode refers to an operation mode when the airflow in the air chamber 1 is relatively large.

[0031] It can be understood that the lower part of the air chamber 1 is immersed in seawater and is provided with a water inlet 11 connected to the interior, which means that seawater can enter the air chamber 1 through the water inlet 11 and leave the air chamber 1 through the water inlet 11. After the seawater enters the air chamber 1, the water level in the air chamber 1 will rise and fall with the rise and fall of the waves. At the peak of the wave, the water level rises, which increases the air pressure in the air chamber 1, and the air flows from the air chamber 1 to the first turbine chamber 2 (or the second turbine chamber 3 described below). At the trough of the wave, the water level drops, which reduces the air pressure in the air chamber 1, and the air flows from the first turbine chamber 2 (or the second turbine chamber 3) to the air chamber 1. In this way, a reciprocating flow of air can be formed between the air chamber 1 and the first turbine chamber 2 (or the second turbine chamber 3).

[0032] Specifically, in the low airflow operation mode: the first airflow channel is used to connect the air chamber 1 and the first turbine chamber 2 when the first channel switch is turned on, or to isolate the air chamber 1 from the first turbine chamber 2 when the first channel switch is turned off; the permanent magnet synchronous generator 7 is used to be in motor mode before the first channel switch is turned on, or in power generation mode after the first channel switch is turned on; before the first channel switch is turned on, the power storage device 8 is used to convert the DC power stored in itself into AC power, and transmit the AC power to the permanent magnet synchronous generator 7, and the permanent magnet synchronous generator 7 is used to drive the Wells turbine 6 based on the AC power provided by the power storage device 8, so as to provide an initial velocity for the Wells turbine 6; after the first channel switch is turned on, the Wells turbine 6 is used to drive the permanent magnet synchronous generator 7 based on the air reciprocating between the air chamber 1 and the first turbine chamber 2, and the permanent magnet synchronous generator 7 is used to generate AC power under the drive of the Wells turbine 6, and the power storage device 8 is used to convert the AC power generated by the permanent magnet synchronous generator 7 into DC power, and store the DC power for subsequent use.

[0033] That is to say, when the wave energy power generation device is in the low airflow operation mode, that is, when the airflow in the air chamber 1 is small, the first channel switch is first closed to isolate the air chamber 1 from the first turbine chamber 2, and the permanent magnet synchronous generator 7 is set to the motor mode. The power storage device 8 will convert the DC power stored in itself into AC power and transmit it to the permanent magnet synchronous generator 7. The permanent magnet synchronous generator 7 will drive the Wells turbine 6 under the energy supply of the power storage device 8, that is, drive the blades of the Wells turbine 6 to rotate, thereby providing an initial velocity for the Wells turbine 6; then, the first channel switch is opened again to connect the air chamber 1 with the first turbine chamber 2, and the permanent magnet synchronous generator 7 is set to the power generation mode. The Wells turbine 6 will drive the permanent magnet synchronous generator 7 based on the air reciprocating between the air chamber 1 and the first turbine chamber 2. The permanent magnet synchronous generator 7 will generate AC power under the drive of the Wells turbine 6, and the power storage device 8 can convert the AC power from the permanent magnet synchronous generator 7 into DC power and store it.

[0034] As can be seen from the above, this embodiment utilizes the characteristic that the permanent magnet synchronous generator 7 can be switched between the power generation mode and the motor mode, and combines the Wells turbine 6, the permanent magnet synchronous generator 7 and the power storage device 8. When generating electricity, the Wells turbine 6 drives the permanent magnet synchronous generator 7 to generate AC power, and the power storage device 8 converts the AC power generated by the permanent magnet synchronous generator 7 into DC power and stores it. Before generating electricity, the power storage device 8 will supply power to the permanent magnet synchronous generator 7, and the permanent magnet synchronous generator 7 will drive the blades of the Wells turbine 6 to rotate, which provides an initial velocity for the Wells turbine 6. In this way, the starting process of the Wells turbine 6 can be accelerated during subsequent power generation, and the time consumed by the Wells turbine 6 to reach the rated speed after starting is shortened, so that the Wells turbine 6 can run at the rated speed for a longer time, thereby improving the working efficiency of the wave energy power generation device.

[0035] In some embodiments, see Figure 1 In addition to the structure given above, the wave energy power generation device also includes a second turbine chamber 3 and an impulse turbine 9. A second airflow channel (not shown) is formed between the upper part of the air chamber 1 and the second turbine chamber 3. A second channel switch (not shown) is provided in the second airflow channel. The impulse turbine 9 is arranged in the second turbine chamber 3. The impulse turbine 9 is mechanically connected to the permanent magnet synchronous generator 7. Specifically, in the high airflow operation mode: the second airflow channel is used to connect the air chamber 1 and the second turbine chamber 3 when the second channel switch is turned on, or to separate the air chamber 1 and the second turbine chamber 3 when the second channel switch is turned off; the permanent magnet synchronous generator 7 is used to always be in the power generation mode; after the second channel switch is turned on, the impulse turbine 9 is used to drive the permanent magnet synchronous generator 7 based on the air reciprocating between the air chamber 1 and the second turbine chamber 3, and the permanent magnet synchronous generator 7 is used to generate AC power under the drive of the impulse turbine 9, and the power storage device 8 is used to convert the AC power generated by the permanent magnet synchronous generator 7 into DC power and store the DC power. It should be noted that a number of guide vanes are provided in the impulse turbine 9, and these guide vanes are distributed in a symmetrical manner on opposite sides of the impulsive turbine 9. In this way, the impulsive turbine 9 can rotate in the same direction under the action of the bidirectional airflow, thereby meeting the driving / power generation requirements of the permanent magnet synchronous generator 7.

[0036] That is to say, in the actual power generation process, when the wave energy power generation device is in the high airflow operation mode, that is, when the airflow in the air chamber 1 is large, it is necessary to close the first channel switch to isolate the air chamber 1 from the first turbine chamber 2, and open the second channel switch to connect the air chamber 1 with the second turbine chamber 3, and set the permanent magnet synchronous generator 7 to the power generation mode. The impulse turbine 9 will drive the permanent magnet synchronous generator 7 based on the reciprocating air flow between the air chamber 1 and the second turbine chamber 3. The permanent magnet synchronous generator 7 will generate AC power under the drive of the impulse turbine 9, and the power storage device 8 can convert the AC power from the permanent magnet synchronous generator 7 into DC power and store it. It can be found that in the actual wave energy power generation process, if the airflow in the air chamber 1 is large (that is, the wave energy power generation device is in a high airflow operation mode), the first channel switch is closed and the second channel switch is opened, so that the air chamber 1 is connected to the second turbine chamber 3, and the impulse turbine 9 is used to drive the permanent magnet synchronous generator 7 to generate electricity; if the airflow in the air chamber 1 is small (that is, the wave energy power generation device is in a low airflow operation mode), the second channel switch is closed and the first channel switch is opened, so that the air chamber 1 is connected to the first turbine chamber 2, and the Wells turbine 6 is used to drive the permanent magnet synchronous generator 7 to generate electricity.

[0037] It is understandable that the present application utilizes the characteristics of the impulse turbine 9 that can adapt to higher working pressure / airflow, and uses the impulse turbine 9 in conjunction with the Wells turbine 6. When the airflow in the air chamber 1 is small, the Wells turbine 6 is used to drive the permanent magnet synchronous generator 7 to generate electricity, and when the airflow in the air chamber 1 is large, the impulse turbine 9 is used to drive the permanent magnet synchronous generator 7 to generate electricity. This can effectively avoid the stall problem of the Wells turbine 6 under high airflow, so that the wave energy power generation device can maintain its power generation capacity under higher working pressure / airflow, increase the operating range of the wave energy power generation device, realize the step-by-step utilization of energy, and thus improve the power generation capacity of the wave energy power generation device. In addition, it should be noted that whether it is the first channel switch or the second channel switch, they can use devices commonly used in the art that can realize airflow channel switching, such as mechanical valves, solenoid valves, and pneumatic valves, etc., which can be selected according to actual needs, and the present application does not make a sole limitation on this.

[0038] In some embodiments, see Figure 1In addition to the structure given above, the wave energy power generation device also includes a control device (not shown in the figure), and the permanent magnet synchronous generator 7, the first channel switch and the second channel switch are respectively connected to the control device for communication, that is, the operation of the permanent magnet synchronous generator 7, the first channel switch and the second channel switch is performed under the control of the control device. Specifically, the control device is used to: control the first channel switch to open or close; control the permanent magnet synchronous generator 7 to switch between the motor mode and the power generation mode; control the second channel switch to open or close; and control the wave energy power generation device to switch between the low airflow operation mode and the high airflow operation mode. Exemplarily, the control device can use any device commonly used in the art with control and data processing and analysis functions, such as a small computer, a microcontroller such as a single-chip microcomputer, an industrial control computer (IPC), a programmable logic controller (PLC), a distributed control system (DCS), etc., and this application does not make a sole limitation on this.

[0039] In some embodiments, see Figure 1 In addition to the structure given above, the wave energy power generation device also includes a gas flow detector (not shown), which is arranged inside the air chamber 1 and is communicatively connected to the control device. Based on this, the gas flow detector is used to detect the gas flow data in the air chamber 1 in real time; the control device is specifically used to determine whether the gas flow data is less than or equal to a preset gas flow threshold, and when it is less than or equal to the preset gas flow threshold, the wave energy power generation device is set to a low gas flow operation mode, or when it is greater than the preset gas flow threshold, the wave energy power generation device is set to a high gas flow operation mode. That is to say, in the actual power generation process, the gas flow detector detects the gas flow data in the air chamber 1 in real time and transmits it to the control device. The control device can compare the gas flow data with the preset gas flow threshold. When the gas flow data is less than or equal to the preset gas flow threshold, it means that the gas flow in the air chamber 1 is small. At this time, the control device will set the wave energy power generation device to a low air flow operation mode, that is, use the Wells turbine 6 to drive the permanent magnet synchronous generator 7 to generate electricity. When the gas flow data is greater than the preset gas flow threshold, it means that the gas flow in the air chamber 1 is large. At this time, the control device will set the wave energy power generation device to a high air flow operation mode, that is, use the impulse turbine 9 to drive the permanent magnet synchronous generator 7 to generate electricity. Exemplarily, the gas flow detector can use any device or a combination of multiple devices with a gas flow detection function commonly used in the art, such as a differential pressure flowmeter, a thermal flowmeter, a vortex flowmeter, and an ultrasonic flowmeter, etc., which can be selected according to actual needs, and this application does not make a sole limitation on this.

[0040] In some embodiments, see Figure 1The power storage device 8 includes an electric energy converter 81 and an electric energy storage device 82. The permanent magnet synchronous generator 7 is electrically connected to the electric energy converter 81, and the electric energy converter 81 is electrically connected to the electric energy storage device 82. Specifically, the electric energy converter 81 is used to convert the AC electric energy generated by the permanent magnet synchronous generator 7 into DC electric energy and transmit it to the electric energy storage device 82; the electric energy storage device 82 is used to store the DC electric energy from the electric energy converter 81, or in the low airflow mode, before the first channel switch is turned on, the DC electric energy stored in itself is transmitted to the electric energy converter 81; the electric energy converter 81 is also used to convert the DC electric energy from the electric energy storage device 82 into AC electric energy and transmit the AC electric energy to the permanent magnet synchronous generator 7 before the first channel switch is turned on, so that the permanent magnet synchronous generator 7 drives the Wells turbine 6, thereby providing the Wells turbine 6 with an initial velocity.

[0041] As one or more embodiments thereof, the power converter 81 includes a converter (not shown) and a filter (not shown), the converter is electrically connected to the filter, the converter is electrically connected to the permanent magnet synchronous generator 7, and the filter is electrically connected to the power storage 82. Specifically, the converter is used to convert the AC power generated by the permanent magnet synchronous generator 7 into DC power and transmit it to the filter, or before the first channel switch is turned on, convert the DC power from the power storage 82 into AC power and transmit it to the permanent magnet synchronous generator 7, so that the permanent magnet synchronous generator 7 drives the Wells turbine 6; the filter is used to filter the DC power from the converter, and transmit the filtered DC power to the power storage 82 for storage. Of course, in other embodiments, the power converter 81 may also include other devices used in power management in the field, such as a voltage stabilizer (not shown), etc., which are not listed one by one in this application; when the power converter 81 also includes a voltage stabilizer, the filter is electrically connected to the voltage stabilizer, and the voltage stabilizer is electrically connected to the power storage 82. The voltage stabilizer is used to stabilize the DC power from the filter and transmit the stabilized DC power to the power storage 82 for storage. Exemplarily, the power storage 82 can be a single battery (not shown) or a battery pack composed of several batteries (not shown). The battery can be a lead-acid battery, a nickel-cadmium battery, a nickel-hydrogen battery, a lithium-ion battery, etc., which can be selected according to actual needs, and this application does not make a sole limitation on this.

[0042] In some embodiments, see Figure 1 In addition to the structure given above, the wave energy power generation device also includes a transformer room 5 and a transformer device 10. The transformer device 10 is arranged in the transformer room 5. The storage device 8 is electrically connected to the transformer device 10. The transformer device 10 is used to electrically connect to the power grid so as to convert the DC power from the storage device 8 into AC power and input it into the power grid.

[0043] As one or more embodiments thereof, the power conversion device 10 includes an inverter (not shown) and a transformer (not shown) that are electrically connected, the power storage device 8 is electrically connected to the inverter, and the transformer is used to electrically connect to the power grid. Specifically, the inverter is used to convert the DC power from the power storage device 8 into AC power and transmit it to the transformer; the transformer is used to boost the AC power from the inverter and input the boosted AC power into the power grid. Of course, the DC power stored in the power storage device 8 is not limited to being input into the power grid, but can also be consumed on site, such as powering the tools used by the staff during the maintenance of the wave power generation device, powering the control device, and powering some lighting devices.

[0044] See also Figure 2 , Figure 2 It is a flow chart of a low-airflow wave energy power generation method. This embodiment provides an oscillating water column wave energy power generation method, which is applied to the oscillating water column wave energy power generation device described above, that is, the wave energy power generation method is implemented based on the wave energy power generation device described above, and the wave energy power generation method includes steps 201 to 205 (abbreviated as S201 to S205), that is: S201, in the low-airflow operation mode, the permanent magnet synchronous generator is set to the motor mode; S202, the power storage device converts the DC power stored in itself into AC power, and transmits the AC power to the permanent magnet synchronous generator, so that the permanent magnet synchronous generator drives the Wells turbine to obtain the initial speed; S203, turn on the first channel switch, and set the permanent magnet synchronous generator to the power generation mode; S204, the Wells turbine drives the permanent magnet synchronous generator based on the air reciprocating between the air chamber and the first turbine chamber, so that the permanent magnet synchronous generator generates AC power; S205, the power storage device converts the AC power from the permanent magnet synchronous generator into DC power and stores it.

[0045] In some embodiments, see Figure 3 , Figure 3 It is a flow chart of a high-airflow wave energy power generation method, which also includes a power generation process when the wave energy power generation device is in a high-airflow operation mode. The power generation process when the wave energy power generation device is in a high-airflow operation mode includes steps 301 to 304 (abbreviated as S301 to S304), namely: S301, in the high-airflow operation mode, the permanent magnet synchronous generator is set to a power generation mode; S302, the first channel switch is closed, and the second channel switch is opened; S303, the impulse turbine drives the permanent magnet synchronous generator based on the air reciprocatingly flowing between the air chamber and the second turbine chamber, so that the permanent magnet synchronous generator generates AC power; S304, the power storage device converts the AC power from the permanent magnet synchronous generator into DC power and stores it.

[0046] In some embodiments, see Figure 4 , Figure 4 It is a flow chart of the low / high airflow operation mode conversion. The wave energy power generation method also includes a conversion process of the wave energy power generation device between the low airflow operation mode and the high airflow operation mode. The conversion process between the low airflow operation mode and the high airflow operation mode includes steps 401 to 404 (abbreviated as S401 to S404), namely: S401, the gas flow detector detects the air flow data in the air chamber in real time; S402, the control device determines whether the air flow data is less than or equal to the preset air flow threshold; S403, when the air flow data is less than or equal to the preset air flow threshold, the control device sets the wave energy power generation device to the low airflow operation mode; S404, when the air flow data is greater than the preset air flow threshold, the control device sets the wave energy power generation device to the high airflow operation mode. In addition, it should be noted that for the unfinished description of the wave energy power generation method, please refer to the relevant description of the wave energy power generation device in the previous text, and this application will not repeat it here.

[0047] The above embodiments are only preferred implementations of the present application, and they are not the only limitations on the oscillating water column wave energy power generation device and related methods; in this regard, those skilled in the art can flexibly set them according to the actual application scenarios based on the above embodiments. It can be understood that, through the implementation of the above embodiments of the present application, the air chamber 1, the first turbine chamber 2, the power generation chamber 4, the Wells turbine 6, the permanent magnet synchronous generator 7 and the power storage device 8 are used to form an oscillating water column wave energy power generation device, the wave energy power generation device has a low airflow operation mode, the permanent magnet synchronous generator 7 has a power generation mode and a motor mode, a first airflow channel is formed between the upper part of the air chamber 1 and the first turbine chamber 2, and a first channel switch is provided in the first airflow channel, the lower part of the air chamber 1 is immersed in seawater, and a water inlet 11 for seawater to enter and exit the air chamber 1 is provided in the lower part of the air chamber 1, the Wells turbine 6 is arranged in the first turbine chamber 2, the permanent magnet synchronous generator 7 and the power storage device 8 are both arranged in the power generation chamber 4, the Wells turbine 6 is mechanically connected to the permanent magnet synchronous generator 7, and the permanent magnet synchronous generator 7 is electrically connected to the power storage device 8. In actual application, when the wave energy power generation device is in the low airflow operation mode, that is, when the airflow in the air chamber 1 is small, the first channel switch is first closed to isolate the air chamber 1 from the first turbine chamber 2, and the permanent magnet synchronous generator 7 is set to the motor mode. The storage device 8 will convert the DC power stored in itself into AC power and transmit it to the permanent magnet synchronous generator 7. The permanent magnet synchronous generator 7 will drive the Wells turbine 6 under the energy supply of the storage device 8, thereby providing the Wells turbine 6 with an initial velocity; then, the first channel switch is opened again to connect the air chamber 1 with the first turbine chamber 2, and the permanent magnet synchronous generator 7 is set to the power generation mode. The Wells turbine 6 will drive the permanent magnet synchronous generator 7 based on the air reciprocating between the air chamber 1 and the first turbine chamber 2. The permanent magnet synchronous generator 7 will generate AC power under the drive of the Wells turbine 6, and the storage device 8 can convert the AC power from the permanent magnet synchronous generator 7 into DC power and store it. It can be seen that the present application utilizes the characteristic that the permanent magnet synchronous generator 7 can be switched between the power generation mode and the motor mode, and combines the Wells turbine 6, the permanent magnet synchronous generator 7 and the power storage device 8. When generating electricity, the Wells turbine 6 drives the permanent magnet synchronous generator 7 to generate AC power, and the power storage device 8 converts the AC power generated by the permanent magnet synchronous generator 7 into DC power and stores it. Before generating electricity, the power storage device 8 will supply power to the permanent magnet synchronous generator 7, and the permanent magnet synchronous generator 7 will drive the Wells turbine 6 to rotate, which provides an initial speed for the Wells turbine 6. In this way, the starting process of the Wells turbine 6 can be accelerated during subsequent power generation, and the time consumed by the Wells turbine 6 to reach the rated speed after starting is shortened, so that the Wells turbine 6 can run at the rated speed for a longer time, thereby improving the working efficiency of the wave energy power generation device.

[0048] It should be noted that the several embodiments shown in the present application above are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can refer to each other. It should also be noted that in the text description of the present application, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is such an actual relationship or order between these entities or operations. Further, the terms "include", "comprise" or any other corresponding variants are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only these elements, but also other elements that are not explicitly listed, or may also include elements inherent to such a process, method, article or device; and, in the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0049] In addition, by implementing the several embodiments shown above in the present application, professionals and technicians in this field can implement or use the present application. For the several embodiments shown above in the present application, various modifications will be obvious to professionals and technicians in this field, and the general principles defined in the present application can be implemented in other embodiments not shown without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the several embodiments shown above, but will conform to the widest range consistent with the principles and novel features disclosed in the present application.

Claims

1. An oscillating water column wave energy power generation device, characterized in that: It includes an air chamber, a first turbine chamber, a power generation chamber, a Wells turbine, a permanent magnet synchronous generator and an electricity storage device. A first air flow channel is formed between the upper part of the air chamber and the first turbine chamber. A first channel switch is provided in the first air flow channel. The lower part of the air chamber is immersed in seawater. A water inlet for the seawater to enter and exit the air chamber is opened in the lower part of the air chamber. The Wells turbine is arranged in the first turbine chamber. The permanent magnet synchronous generator and the electricity storage device are both arranged in the power generation chamber. The Wells turbine is mechanically connected to the permanent magnet synchronous generator. The permanent magnet synchronous generator is electrically connected to the electricity storage device. The permanent magnet synchronous generator has a power generation mode and a motor mode. The wave energy power generation device has a low airflow operation mode.

2. The wave energy power generation device according to claim 1, characterized in that: In the described low airflow operating mode: The first air flow channel is used to connect the air chamber and the first turbine chamber when the first channel switch is turned on, or to separate the air chamber and the first turbine chamber when the first channel switch is turned off; the permanent magnet synchronous generator is used to be in the motor mode before the first channel switch is turned on, or in the power generation mode after the first channel switch is turned on; Before the first channel switch is turned on, the power storage device is used to convert the stored DC power into AC power and transmit it to the permanent magnet synchronous generator; The permanent magnet synchronous generator is used to drive the Wells turbine based on the AC electric energy so as to provide an initial speed for the Wells turbine; When the first channel switch is turned on, the Wells turbine is used to drive the permanent magnet synchronous generator based on the air flowing back and forth between the air chamber and the first turbine chamber; The permanent magnet synchronous generator is used to generate the AC electric energy under the drive of the Wells turbine; The power storage device is used to convert the AC power into the DC power and store it.

3. The wave energy power generation device according to claim 2, characterized in that: The device further comprises a second turbine chamber and an impulse turbine, wherein a second airflow channel is formed between the upper portion of the air chamber and the second turbine chamber, a second channel switch is provided in the second airflow channel, the impulse turbine is arranged in the second turbine chamber and mechanically connected to the permanent magnet synchronous generator, and the wave energy power generation device further has a high airflow operation mode, in which: The second air flow channel is used to connect the air chamber and the second turbine chamber when the second channel switch is turned on, or to separate the air chamber and the second turbine chamber when the second channel switch is turned off; the permanent magnet synchronous generator is used to be in the power generation mode; When the second channel switch is turned on, the impulse turbine is used to drive the permanent magnet synchronous generator based on the air flowing back and forth between the air chamber and the second turbine chamber; The permanent magnet synchronous generator is used to generate the AC electric energy under the drive of the impulse turbine; The power storage device is used to convert the AC power into the DC power and store it.

4. The wave energy power generation device according to claim 3, characterized in that: The first channel switch and the second channel switch each include any one of a mechanical valve, a solenoid valve, and a pneumatic valve.

5. The wave energy power generation device according to claim 3, characterized in that: It also includes a control device, wherein the first channel switch, the permanent magnet synchronous generator and the second channel switch are respectively communicatively connected to the control device, and the control device is used to: control the first channel switch to be opened or closed; control the permanent magnet synchronous generator to switch between the motor mode and the power generation mode; control the second channel switch to be opened or closed; and control the wave energy power generation device to switch between the low airflow operation mode and the high airflow operation mode.

6. The wave energy power generation device according to claim 5, characterized in that: It also includes a gas flow detector, which is arranged in the gas chamber and is communicatively connected to the control device, wherein: The gas flow detector is used to detect the gas flow data in the gas chamber in real time; The control device is specifically used to determine whether the air flow data is less than or equal to a preset air flow threshold, and when it is less than or equal to the preset air flow threshold, set the wave energy power generation device to the low air flow operation mode, or when it is greater than the preset air flow threshold, set the wave energy power generation device to the high air flow operation mode.

7. The wave energy power generation device according to claim 2, characterized in that: The power storage device includes an electric energy converter and an electric energy storage device, wherein the electric energy storage device, the electric energy converter and the permanent magnet synchronous generator are electrically connected in sequence, wherein: The electric energy converter is used to convert the AC electric energy generated by the permanent magnet synchronous generator into the DC electric energy and transmit it to the electric energy storage; The electric energy storage device is used to store the DC electric energy from the electric energy converter, or to transmit the stored DC electric energy to the electric energy converter before the first channel switch is turned on; The electric energy converter is also used to convert the DC electric energy from the electric energy storage into the AC electric energy before the first channel switch is opened, and transmit it to the permanent magnet synchronous generator so that the permanent magnet synchronous generator drives the Wells turbine.

8. The wave energy power generation device according to claim 7, characterized in that: The electric energy converter comprises a converter and a filter electrically connected to the converter, the converter is electrically connected to the permanent magnet synchronous generator, and the filter is electrically connected to the electric energy storage device, wherein: The converter is used to convert the AC power generated by the permanent magnet synchronous generator into the DC power and transmit it to the filter, or before the first channel switch is turned on, convert the DC power from the power storage into the AC power and transmit it to the permanent magnet synchronous generator, so that the permanent magnet synchronous generator drives the Wells turbine; The filter is used to filter the DC power from the converter and transmit the filtered DC power to the power storage.

9. The wave energy power generation device according to claim 8, characterized in that: The electric energy converter also includes a voltage stabilizer, the filter is electrically connected to the voltage stabilizer, and the voltage stabilizer is electrically connected to the electric energy storage device. The voltage stabilizer is used to stabilize the DC power from the filter and transmit the stabilized DC power to the electric energy storage device.

10. The wave energy power generation device according to claim 7, characterized in that: The electrical energy storage device comprises a single battery or a battery pack composed of a plurality of such batteries.

11. The wave energy power generation device according to claim 2, characterized in that: It also includes a transformer room and a transformer device, wherein the transformer device is arranged in the transformer room, the power storage device is electrically connected to the transformer device, and the transformer device is used to electrically connect to the power grid so as to convert the DC power from the power storage device into the AC power and input it into the power grid.

12. The wave energy power generation device according to claim 11, characterized in that: The power conversion device includes an inverter and a transformer, the inverter is electrically connected to the transformer, the power storage device is electrically connected to the inverter, and the transformer is used to electrically connect to the power grid, wherein: The inverter is used to convert the DC power from the power storage device into the AC power and transmit it to the transformer; The transformer is used to boost the AC power from the inverter and input the boosted AC power into the power grid.

13. An oscillating water column wave energy power generation method, characterized in that: The invention is applied to an oscillating water column type wave energy power generation device, the wave energy power generation device comprises an air chamber, a first turbine chamber, a power generation chamber, a Wells turbine, a permanent magnet synchronous generator and a power storage device, a first air flow channel is formed between the upper part of the air chamber and the first turbine chamber, a first channel switch is arranged in the first air flow channel, the lower part of the air chamber is immersed in seawater, a water inlet for the seawater to enter and exit the air chamber is opened in the lower part of the air chamber, the Wells turbine is arranged in the first turbine chamber, the permanent magnet synchronous generator and the power storage device are both arranged in the power generation chamber, the Wells turbine is mechanically connected to the permanent magnet synchronous generator, the permanent magnet synchronous generator is electrically connected to the power storage device, the permanent magnet synchronous generator has a power generation mode and a motor mode, and the wave energy power generation device has a low airflow operation mode; the wave energy power generation method comprises: In the low airflow operation mode, setting the permanent magnet synchronous generator to the motor mode; The power storage device converts the DC power stored in the power storage device into AC power and transmits the AC power to the permanent magnet synchronous generator, so that the permanent magnet synchronous generator drives the Wells turbine, so that the Wells turbine obtains an initial speed; Turning on the first channel switch and setting the permanent magnet synchronous generator to the power generation mode; The Wells turbine drives the permanent magnet synchronous generator based on the air reciprocating between the air chamber and the first turbine chamber, so that the permanent magnet synchronous generator generates the AC electric energy; The power storage device converts the AC power from the permanent magnet synchronous generator into the DC power and stores the DC power.

14. The wave energy power generation method according to claim 13, characterized in that: The wave energy power generation device further comprises a second turbine chamber and an impulse turbine, a second airflow channel is formed between the upper portion of the air chamber and the second turbine chamber, a second channel switch is provided in the second airflow channel, the impulse turbine is arranged in the second turbine chamber and mechanically connected to the permanent magnet synchronous generator, and the wave energy power generation device further has a high airflow operation mode: The wave energy power generation method further comprises: In the high airflow operation mode, setting the permanent magnet synchronous generator to the power generation mode; Turn off the first channel switch, and turn on the second channel switch; The impulse turbine drives the permanent magnet synchronous generator based on the air reciprocating between the air chamber and the second turbine chamber, so that the permanent magnet synchronous generator generates the AC electric energy; The power storage device converts the AC power from the permanent magnet synchronous generator into the DC power and stores the DC power.

15. The wave energy power generation method according to claim 14, characterized in that: The wave energy power generation device further comprises a gas flow detector and a control device, wherein the first channel switch, the permanent magnet synchronous generator, the second channel switch and the gas flow detector are respectively communicatively connected to the control device, and the gas flow detector is arranged in the gas chamber; The wave energy power generation method further comprises: The gas flow detector detects the gas flow data in the gas chamber in real time; The control device determines whether the air flow data is less than or equal to a preset air flow threshold; When the airflow data is less than or equal to the preset airflow threshold, the control device sets the wave energy power generation device to the low airflow operation mode; When the airflow volume data is greater than the preset airflow volume threshold, the control device sets the wave energy power generation device to the high airflow operation mode.

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