Tidal energy and tidal current energy combined type power generation system and power generation method

Abstract

The invention provides a tidal energy and tidal current energy combined type power generation system and method.The tidal energy and tidal current energy combined type power generation system comprises a reservoir, the bottom of the reservoir communicates with the top of a connecting channel, a channel water gate is arranged at the communicating position, and a water return opening is formed in the lower portion of the connecting channel; an axial flow water turbine is installed in the connecting channel, and when the channel water gate is opened, water in the reservoir can be communicated with the external tide and drive the axial flow water turbine to rotate; a power generator box is installed on the outer side of the connecting channel, a tidal current energy impeller is installed outside the power generator box, a power generator is installed in the power generator box, the power generator can generate power after being connected with the axial flow water turbine, and the power generator can generate power after being connected with the tidal current energy impeller; a water inlet gate is arranged on the side wall of the reservoir and can be communicated with external tide to feed water into the reservoir, and opening and closing of the water inlet gate and the channel water gate are controlled by the highest water line, the lowest water line and the flood tide control water level.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation, and in particular to a tidal energy and tidal current energy composite power generation system and a power generation method. Background Art

[0002] Currently, tidal energy development primarily involves harnessing the kinetic energy generated by the ebb and flow of tides and the tidal potential energy differential created by water collection in cofferdams to generate electricity. Traditional tidal power generation systems often utilize single-source power generation devices that convert potential or kinetic energy. During low tides, power generation is interrupted due to the disappearance of water level differences and stagnation of the current. This leads to significant intermittent operation, making it impossible to effectively address power supply interruptions during low tides and severely restricting the grid-connected stability of tidal power stations.

[0003] Existing patent 2024113917385 discloses an offshore tidal energy water power generation device. Through a first spiral plate, a magnetic plate and a spring, when the tide is high, the water submerges the groove. When the water pressure exceeds the suction force between the magnetic plate and the sealing plate, the magnetic plate moves downward, so that enough water can flow from the water inlet to the first guide cylinder, driving the first spiral plate to rotate, so that the first generator generates electricity; through a second spiral plate, a solenoid valve and a second guide cylinder, when the tide is low, the water level detector monitors that the water level drops below the lower end surface of the generator shell, and the solenoid valve is activated. Water flows from the water outlet through the water pipe to the guide cavity, driving the second spiral plate to rotate, so that the second generator generates electricity. The electricity generated by the second generator and the first generator is stored in the transmission module and transmitted to the shore for use; that is, energy storage and power generation can only be carried out at high tide and low tide, and the power supply problem during the flat tide period cannot be solved. Summary of the Invention

[0004] To overcome the shortcomings of existing technologies, the present invention proposes a hybrid tidal and tidal energy power generation system and method. During high and low tides, when tidal currents are present, the tidal currents can be used to drive the rotation of the tidal energy impeller. During high and low tides, when tidal currents are absent, the water level potential energy difference between the reservoir and the external tide is converted into kinetic energy within the connecting channel, driving the rotation of the impulse turbine, capturing tidal potential energy to generate electricity, thereby enabling continuous operation of the generator. Simultaneously utilizing tidal potential and kinetic energy, this system compensates for the generator's inability to generate electricity during low tides, achieving continuous and stable power supply.

[0005] The technical solution adopted in the present invention is: A tidal and tidal energy combined power generation system comprises a reservoir and a connecting channel, wherein the bottom of the reservoir is connected to the top of the connecting channel and a channel sluice is provided at the connection point, a water outlet is provided at the lower portion of the connecting channel, the water outlet is connected to the external tide, an axial flow turbine is installed in the connecting channel between the channel sluice and the water outlet, when the channel sluice is opened, water in the reservoir is connected to the external tide and drives the axial flow turbine to rotate; a generator box is installed on the outside of the connecting channel, a tidal energy impeller capable of capturing external tidal flow is installed on the outside of the generator box, a generator is installed in the generator box, when the power generation stage is in the high and low tide period, the generator can be connected to the axial flow turbine to generate electricity, and when the power generation stage is in the high and low tide period, the generator can be connected to the tidal energy impeller to generate electricity; The water reservoir is provided with a maximum water level line, a minimum water level line and a high tide control water level. The side wall of the water reservoir is provided with a water inlet gate, which can communicate with the external tide to allow water to enter the water reservoir. The opening and closing of the water inlet gate and the channel water gate are controlled by the maximum water level line, the minimum water level line and the high tide control water level.

[0006] Furthermore, the generator is provided with input shafts at both its front and rear ends. The input shaft at one end is connected to a tidal electromagnetic clutch via a pair of meshing speed-increasing gears. The tidal electromagnetic clutch is connected to the tidal impeller. The input shaft at the other end is connected to a turbine electromagnetic clutch, which is connected to the axial-flow turbine. The present invention uses the tidal electromagnetic clutch to disconnect and connect tidal power input; the turbine electromagnetic clutch can disconnect and connect tidal potential power input.

[0007] Furthermore, the generator is a double-headed permanent magnet synchronous generator that can generate electricity in forward and reverse modes.

[0008] Furthermore, the generator box is a sealed structure, and the speed increasing gear, tidal energy electromagnetic clutch, and turbine electromagnetic clutch are all installed in the generator box.

[0009] Furthermore, the axial flow turbine is connected to a fixed beam through a coupling, the fixed beam is fixed in the connecting channel, the axial flow turbine is engaged with the end of the turbine connecting shaft through the bevel gear at the bottom, and the turbine connecting shaft is connected to the turbine electromagnetic clutch.

[0010] Furthermore, the axial flow turbine is a bidirectional axial flow turbine. When the water in the connecting channel flows downward or upward, it will impact the axial flow turbine to rotate forward or reverse, driving the generator to rotate forward or reverse.

[0011] Furthermore, the tidal energy impeller is provided with a variable pitch structure, and when the tidal current switches direction between the high tide stage and the low tide stage, the bidirectional tidal flow can be captured by the variable pitch device.

[0012] The specific steps of the power generation method of the above-mentioned tidal energy and tidal current energy combined power generation system are as follows: During the low tide stage, the external tide is at its lowest level and the tidal flow slows down. At this time, the tidal impeller stops rotating, the water level in the reservoir is at its highest water level, the inlet gate remains closed, and the channel gate is opened. The water in the reservoir will flow through the channel gate and merge into the external tide through the outlet, thereby driving the axial flow turbine to rotate forward, and the power is transmitted to the generator, which generates electricity based on the tidal potential energy. When the water level in the reservoir drops to the lowest water level, the low tide stage ends and the high tide stage begins. During the high tide stage, the external tidal water level begins to rise, the tidal flow velocity increases, and the tidal impeller is driven to rotate in the forward direction, relying on the tidal kinetic energy of the high tide to generate electricity; the inlet gate is opened, and the channel sluice is closed. The reservoir is connected to the external tide through the inlet gate, and the water level in the reservoir will gradually rise with the external tide. When the water level in the reservoir rises to the high tide control water level, the inlet gate is closed, and the channel sluice is kept closed. The water level in the reservoir stops rising, and the external tidal water level continues to rise. After the high tide stage, it rises to the highest tidal level; During the high-slack tide stage, the external tide is at its highest level, the tidal flow rate slows down, the tidal impeller stops rotating, the water level in the reservoir is at the high-tide control level, the inlet gate remains closed, and the channel sluice gate is opened. The water from the external tide enters the connecting channel through the outlet, flows into the reservoir through the channel sluice gate, and then drives the axial-flow turbine to rotate in the opposite direction. The power is transmitted to the generator, and electricity is generated by relying on the tidal potential energy. When the water level in the reservoir rises to the highest water level line, the high-slack tide stage ends, the tide reverses, and the ebb tide stage begins. During the ebb tide stage, the external tidal water level begins to drop, the tidal flow velocity increases, driving the tidal energy impeller to rotate in the opposite direction, keeping the inlet gate closed, closing the channel sluice gate, and the water level in the reservoir unchanged. It only relies on the tidal kinetic energy at low tide to generate electricity. When the external tidal water level drops to the lowest tide level, it enters the low tide stage and enters the next cycle of power generation.

[0013] Furthermore, during the high and low tide stages, the turbine electromagnetic clutch is in the connected position and the tidal energy electromagnetic clutch is in the disconnected position, thereby cutting off the connection between the tidal energy impeller and the generator. The axial flow turbine drives the generator to generate electricity, thereby capturing tidal potential energy and avoiding the power passing through the speed-increasing gear to drive the tidal energy impeller to rotate, causing energy loss.

[0014] Furthermore, during high tide and low tide, the tidal electromagnetic clutch is in a connected state and the turbine electromagnetic clutch is in a disconnected state, thereby disconnecting the axial flow turbine and the generator, preventing power from driving the axial flow turbine to rotate through the bevel gear and causing energy loss.

[0015] The beneficial effects of the present invention are as follows: a composite tidal potential energy and kinetic energy capture method is adopted. During the rising and falling tide stages, when there is a tide, the tide is used to drive the tidal energy impeller to rotate. When there is no tide during high and low tides, the water level potential energy difference between the reservoir and the external tide is used to drive the axial flow turbine to rotate, capture the tidal potential energy for power generation. Tidal potential energy and kinetic energy can be utilized at the same time to make up for the deficiency of the generator being unable to generate electricity during the flat tide stage, thereby achieving continuous and stable power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 It is a schematic structural diagram of the interior of the generator box of the present invention.

[0018] Figure 3 It is a structural schematic diagram of the axial flow turbine of the present invention.

[0019] Figure 4 It is a schematic diagram of the operating structure of the present invention during the low tide stage.

[0020] Figure 5 It is a schematic diagram of the operating structure of the present invention during the high tide stage.

[0021] Figure 6 It is a schematic diagram of the operating structure of the present invention during the high and low tide stage.

[0022] Figure 7 It is a schematic diagram of the operating structure of the present invention during the ebb tide stage.

[0023] In the figure: 1. Reservoir; 2. Highest tide level; 3. Lowest tide level; 4. Inlet gate; 5. Channel gate; 6. Highest water level; 7. High tide control water level; 8. Lowest water level; 9. Axial flow turbine; 10. Connecting channel; 11. Tidal energy impeller; 12. Generator box; 13. Water outlet; 14. Low-speed gear; 15. High-speed gear; 16. Generator; 17. Tidal energy electromagnetic clutch; 18. Turbine electromagnetic clutch; 19. Fixed beam; 20. Coupling; 21. Turbine connecting shaft; 22. Bevel gear. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to specific embodiments, but the present invention is not limited to these specific embodiments. Those skilled in the art should recognize that the present invention covers all possible alternatives, improvements and equivalents within the scope of the claims.

[0025] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more, unless otherwise clearly defined.

[0026] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0027] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may also include the first and second features not being in direct contact but being in contact via another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or diagonally above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or diagonally below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0028] Example 1

[0029] See also Figure 1-3The present embodiment provides a tidal energy and tidal energy combined power generation system, comprising a reservoir 1 and a connecting channel 10. The bottom of the reservoir 1 is connected to the top of the connecting channel 10 and a channel sluice 5 is provided at the connection point. A water outlet 13 is provided at the lower part of the connecting channel 10. The water outlet 13 is connected to the external tide. An axial flow turbine 9 is installed in the connecting channel 10 between the channel sluice 5 and the water outlet 13. When the channel sluice 5 is opened, the water energy in the reservoir 1 flows through the connecting channel 10 and then flows into the external tide from the water outlet 13. Water energy flows through the water outlet 13 and into the reservoir 1 from the connecting channel 10, thereby driving the axial-flow turbine 9 to rotate. A generator box 12 is installed on the outside of the connecting channel 10. A tidal energy impeller 11 capable of capturing external tidal currents is installed on the outside of the generator box 12. A generator 16 is installed in the generator box 12. During the high and low tide periods, the generator 16 can be connected to the axial-flow turbine 9 to generate electricity. During the high and low tide periods, the generator 16 can be connected to the tidal energy impeller 11 to generate electricity. The water reservoir 1 is provided with a maximum water level line 6, a minimum water level line 8 and a high tide control water level 7. The side wall of the water reservoir 1 is provided with an inlet gate 4. The inlet gate 4 can communicate with the external tide to allow water to enter the water reservoir 1. The opening and closing of the inlet gate 4 and the channel sluice 5 are controlled by the maximum water level line 6, the minimum water level line 8 and the high tide control water level 7.

[0030] Specifically, the reservoir 1 is 5-10 meters deep, with water level sensors installed on the side walls. A maximum water level 6, a minimum water level 8, and a high-tide control level 7 are set. These control the opening and closing of the inlet gate 4 and the channel sluice 5 based on water level fluctuations. The maximum water level 6 is 0.3-1.0 m below the highest tide level 2, the high-tide control level 7 is approximately 0.5-1.0 m from the maximum water level 6, and the minimum water level 8 is 0.3-1.0 m above the lowest tide level 3. The channel sluice 5 and the inlet gate 4 are electrically operated gates with a flow rate of 10-50 m³ / s. Their opening can be dynamically adjusted by an automated system to match tidal cycles or flood control needs.

[0031] The generator 16 in this embodiment is a double-headed permanent magnet synchronous generator capable of generating electricity in both forward and reverse modes. Input shafts are provided at both the front and rear ends of the generator 16. The input shaft at one end is connected to a tidal electromagnetic clutch 17 via a pair of meshing speed-increasing gears. This tidal electromagnetic clutch 17 is connected to the tidal impeller 11. The input shaft at the other end is connected to a turbine electromagnetic clutch 18, which is connected to the axial-flow turbine 9. The tidal electromagnetic clutch 17 can disconnect and connect tidal power input, while the turbine electromagnetic clutch 18 can disconnect and connect tidal potential power input. The generator housing 12 in this embodiment is a sealed structure that prevents external water from entering the internal chamber. The speed-increasing gears, tidal electromagnetic clutch 17, and turbine electromagnetic clutch 18 are all mounted within the generator housing 12. The generator housing 12 is removably mounted on the outer wall of the connecting channel 10, facilitating installation and maintenance.

[0032] Specifically, the speed-increasing gear comprises a low-speed gear 14 and a high-speed gear 15. The high-speed gear 15 is connected to the input shaft of a generator 16. The low-speed gear 14 is connected to a tidal energy electromagnetic clutch 17. The low-speed gear 14 and the high-speed gear 15 are meshed and connected, and the speed-increasing ratio is set to 1:20-1:50. The tidal energy impeller 11 is provided with a variable pitch structure. When the tidal current switches direction during high and low tide, the variable pitch device can capture the bidirectional tidal flow.

[0033] The connecting channel 10 described in this embodiment is a tubular structure with its bottom fixed to the seabed. The water outlet 13 is a mesh-like leaky structure, allowing water to flow freely and filtering out larger foreign matter to prevent damage to the turbine. The axial-flow turbine 9 is connected to a fixed beam 19 via a coupling 20. The fixed beam 19 is fixed within the connecting channel 10. The axial-flow turbine 9 engages with the end of a turbine connecting shaft 21 via a pair of meshing bevel gears 22 at the bottom. The turbine connecting shaft 21 is connected to the turbine electromagnetic clutch 18. The axial-flow turbine 9 is a bidirectional axial-flow turbine. When the water in the connecting channel 10 flows downward or upward, it impacts the axial-flow turbine 9, causing it to rotate forward or reverse, driving the generator 16 to rotate forward or reverse.

[0034] The present invention adopts a composite tidal potential energy and kinetic energy capture method. During the rising and falling tide stages, when there is a tidal current, the tidal current is used to drive the tidal energy impeller to rotate. When there is no tidal current during high and low tides, the water level potential energy difference between the reservoir and the external tide is used to drive the axial flow turbine to rotate, capture the tidal potential energy for power generation. The tidal potential energy and kinetic energy can be utilized simultaneously to make up for the deficiency of the generator being unable to generate electricity during the slack tide stage, thereby achieving continuous and stable power supply.

[0035] Example 2

[0036] Lieutenant General Figure 4-7 The power generation method of the tidal energy and tidal energy combined power generation system described in Example 1 has the following specific steps: During the low tide stage, the external tide is at its lowest level, and the tidal flow rate slows down to ≤0.5m / s. At this time, the tidal energy impeller 11 stops rotating and the connection between the tidal energy impeller 11 and the generator 16 is disconnected. The connection between the generator 16 and the turbine connecting shaft 21 is also disconnected. The water level in the reservoir 1 is at the highest water level line 6. The inlet gate 4 remains closed, and the channel sluice gate 5 is opened to 75 degrees. The water in the reservoir 1 will flow through the channel sluice gate 5 and merge into the external tide through the water outlet 13. The water level difference of ≥1.5m between the reservoir 1 and the external tide is used to drive the axial flow turbine 9 to rotate in the forward direction. The power is transmitted to the generator 16 through the turbine connecting shaft 21, and electricity is generated by relying on the tidal potential energy. When the water level in the reservoir 1 drops to the lowest water level line 8, the low tide stage ends and the high tide stage begins. During the high tide stage, the external tidal water level begins to rise, the tidal flow velocity increases, and the tidal flow velocity is ≥0.5m / s. The blades of the tidal energy impeller 11 are adjusted to the optimal angle of attack position, driving the tidal energy impeller 11 to rotate forward, and connecting the tidal energy impeller 11 and the generator 16 through the tidal energy electromagnetic clutch 17. The turbine electromagnetic clutch 18 is disconnected to cut off the connection between the generator 16 and the turbine connecting shaft 21, and the tidal kinetic energy is captured to avoid energy loss, and power generation is performed by relying on the tidal kinetic energy during high tide. The water inlet gate 4 is opened to an opening of 75°, and the channel sluice 5 is closed. The reservoir 1 is connected to the external tide through the water inlet gate 4. The water level in the reservoir 1 will gradually rise with the external tide. When the water level in the reservoir 1 rises to the high tide control water level 7, the water inlet gate 4 is closed, and the channel sluice 5 is kept closed. The water level in the reservoir 1 stops rising, and the external tidal water level continues to rise. After the high tide stage, it rises to the highest tide level 2. During the high-slack tide stage, the external tide is at its highest level, the tidal flow rate slows down, and the tidal flow rate is ≤0.5m / s. The tidal impeller 11 stops rotating and the connection between the tidal impeller 11 and the generator 16 is disconnected. The connection between the generator 16 and the turbine connecting shaft 21 is also disconnected. The water level in the reservoir 1 is at the high-tide control level 7. The inlet gate 4 remains closed, and the channel sluice 5 is opened to a 75° opening. The external tidal water enters the connecting channel 10 through the outlet 13 and flows into the reservoir 1 through the channel sluice 5. The water level difference of ≥0.3m between the external tide and the reservoir 1 is used to drive the axial-flow turbine 9 to rotate in the opposite direction, and the power is transmitted to the generator 16, which relies on the tidal potential energy to continuously generate electricity. When the water level in the reservoir 1 rises to the highest water level line 6, the high-slack tide stage ends, the tidal current reverses, and the ebb tide stage begins. During the ebb tide stage, the external tidal water level begins to drop, the tidal flow velocity increases, the tide reverses and the flow velocity is ≥0.5m / s. The blades of the tidal energy impeller 11 are adjusted to the reverse optimal angle of attack position, driving the tidal energy impeller 11 to rotate in the reverse direction, and the tidal energy impeller 11 and the generator 16 are connected to start capturing the tidal kinetic energy. The connection between the generator 16 and the turbine connecting shaft 21 is disconnected, the water inlet gate 4 is kept closed, the channel sluice gate 5 is closed, the water level in the reservoir 1 remains unchanged, and power generation is performed only by the tidal kinetic energy during ebb tide. When the external tidal water level drops to the lowest tide level 3, the low tide stage is entered, and the next cycle of power generation begins.

[0037] During high and low tides, the turbine electromagnetic clutch 18 is connected and the tidal electromagnetic clutch 17 is disconnected. This disconnects the tidal energy impeller 11 and the generator 16, allowing the axial-flow turbine 9 to drive the generator 16 for power generation. This captures tidal potential energy and prevents power from passing through the speed-increasing gear to drive the tidal energy impeller 11, which would otherwise cause energy loss. During high and low tides, the tidal electromagnetic clutch 17 is connected and the turbine electromagnetic clutch 18 is disconnected, disconnecting the axial-flow turbine 9 and the generator 16. This prevents power from passing through the bevel gear to drive the axial-flow turbine 9, which would otherwise cause energy loss.

[0038] The present invention adopts a composite tidal potential energy and kinetic energy capture method. During the rising and falling tide stages, when there is a tidal current, the tidal current is used to drive the tidal energy impeller to rotate. When there is no tidal current during high and low tides, the water level potential energy difference between the reservoir and the external tide is used to drive the axial flow turbine to rotate, capture the tidal potential energy for power generation. The tidal potential energy and kinetic energy can be utilized simultaneously to make up for the deficiency of the generator being unable to generate electricity during the slack tide stage, thereby achieving continuous and stable power supply.

Claims

1. A tidal energy and tidal current energy combined power generation system, characterized by: The invention comprises a water reservoir and a connecting channel, wherein the bottom of the water reservoir is connected to the top of the connecting channel and a channel sluice is provided at the connection point, a water outlet is provided at the lower part of the connecting channel, the water outlet is connected to the external tide, an axial flow turbine is installed in the connecting channel between the channel sluice and the water outlet, when the channel sluice is opened, the water in the water reservoir is connected to the external tide and drives the axial flow turbine to rotate; a generator box is installed on the outside of the connecting channel, a tidal energy impeller capable of capturing external tidal flow is installed outside the generator box, a generator is installed in the generator box, when the power generation stage is in the high and low tide period, the generator can be connected to the axial flow turbine to generate electricity, and when the power generation stage is in the high tide period and the low tide period, the generator can be connected to the tidal energy impeller to generate electricity; The water reservoir is provided with a maximum water level line, a minimum water level line and a high tide control water level. The side wall of the water reservoir is provided with a water inlet gate, which can communicate with the external tide to allow water to enter the water reservoir. The opening and closing of the water inlet gate and the channel water gate are controlled by the maximum water level line, the minimum water level line and the high tide control water level.

2. The tidal and current energy combined power generation system according to claim 1, characterized in that: Input shafts are provided at both the front and rear ends of the generator. The input shaft at one end is connected to a tidal energy electromagnetic clutch through a pair of meshing speed-increasing gears, and the tidal energy electromagnetic clutch is connected to the tidal energy impeller. The input shaft at the other end is connected to a turbine electromagnetic clutch, and the turbine electromagnetic clutch is connected to the axial flow turbine.

3. The tidal and current energy combined power generation system according to claim 2, characterized in that: The generator is a double-headed permanent magnet synchronous generator.

4. The tidal and current energy combined power generation system according to claim 3, characterized in that: The generator box is a sealed structure, and the speed increasing gear, tidal energy electromagnetic clutch, and turbine electromagnetic clutch are all installed in the generator box.

5. The tidal and current energy combined power generation system according to claim 1, characterized in that: The axial flow turbine is connected to a fixed beam through a coupling, the fixed beam is fixed in the connecting channel, the axial flow turbine is meshed with the end of the turbine connecting shaft through a bevel gear at the bottom, and the turbine connecting shaft is connected to the turbine electromagnetic clutch.

6. The tidal and current energy combined power generation system according to claim 5, characterized in that: The axial flow turbine is a bidirectional axial flow turbine.

7. The tidal and current energy combined power generation system according to claim 1, characterized in that: The tidal energy impeller is provided with a variable pitch structure.

8. The power generation method of a tidal energy and tidal current energy combined power generation system according to any one of claims 1 to 7, wherein the specific steps are as follows: During the low tide stage, the external tide is at its lowest level and the tidal flow slows down. At this time, the tidal impeller stops rotating, the water level in the reservoir is at its highest water level, the inlet gate remains closed, and the channel gate is opened. The water in the reservoir will flow through the channel gate and merge into the external tide through the outlet, thereby driving the axial flow turbine to rotate forward, and the power is transmitted to the generator, which generates electricity based on the tidal potential energy. When the water level in the reservoir drops to the lowest water level, the low tide stage ends and the high tide stage begins. During the high tide stage, the external tidal water level begins to rise, the tidal flow velocity increases, and the tidal impeller is driven to rotate in the forward direction, relying on the tidal kinetic energy of the high tide to generate electricity; the inlet gate is opened, and the channel sluice is closed. The reservoir is connected to the external tide through the inlet gate, and the water level in the reservoir will gradually rise with the external tide. When the water level in the reservoir rises to the high tide control water level, the inlet gate is closed, and the channel sluice is kept closed. The water level in the reservoir stops rising, and the external tidal water level continues to rise. After the high tide stage, it rises to the highest tidal level; During the high-slack tide stage, the external tide is at its highest level, the tidal flow rate slows down, the tidal impeller stops rotating, the water level in the reservoir is at the high-tide control level, the inlet gate remains closed, and the channel sluice gate is opened. The water from the external tide enters the connecting channel through the outlet, flows into the reservoir through the channel sluice gate, and then drives the axial-flow turbine to rotate in the opposite direction. The power is transmitted to the generator, and electricity is generated by relying on the tidal potential energy. When the water level in the reservoir rises to the highest water level line, the high-slack tide stage ends, the tide reverses, and the ebb tide stage begins. During the ebb tide stage, the external tidal water level begins to drop, the tidal flow velocity increases, driving the tidal energy impeller to rotate in the opposite direction, keeping the inlet gate closed, closing the channel sluice gate, and the water level in the reservoir unchanged. It only relies on the tidal kinetic energy at low tide to generate electricity. When the external tidal water level drops to the lowest tide level, it enters the low tide stage and enters the next cycle of power generation.

9. The power generation method of a tidal energy and tidal energy combined power generation system according to claim 8, characterized in that: During the high and low tide stages, the turbine electromagnetic clutch is in the connected position and the tidal energy electromagnetic clutch is in the disconnected position.

10. The power generation method of a tidal energy and tidal current energy combined power generation system according to claim 8, characterized in that: During high tide and low tide, the tidal energy electromagnetic clutch is in the connected state and the turbine electromagnetic clutch is in the disconnected state.

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