Wind and wave complementary power generation system and method capable of being used for variable sea conditions

Abstract

The invention relates to the technical field of ocean electromechanical equipment, in particular to a wind and wave complementary power generation system and method capable of being used for variable sea conditions, and the system comprises a wind energy capturing module which comprises a fan impeller and a hydraulic pump, and the fan impeller is connected with the hydraulic pump; the wave energy capturing module comprises a hydraulic cylinder set, a one-way valve set, a second energy accumulator and a second electromagnetic reversing valve, the energy coupling power generation module comprises a gear set and a hydraulic motor set, the control module comprises a wind speed sensor and a controller, and control signals of the controller are connected with the first electromagnetic reversing valve and the second electromagnetic reversing valve. By means of the mode that hydraulic transmission and mechanical transmission are combined, the complexity of the system is simplified, meanwhile, by means of the characteristics that the hydraulic energy accumulator is low in energy loss and capable of efficiently adjusting energy fluctuation, the energy transmission efficiency is improved, and loss and fluctuation of energy in the transmission and adjustment process are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of marine electromechanical equipment, and in particular to a wind-wave complementary power generation system and method that can be used in variable sea conditions. Background Art

[0002] As a green and renewable energy source, the comprehensive development of wind and wave energy is of great significance. Offshore wind-wave complementary power generation systems have become a research hotspot for reducing fluctuations in the output power of a single energy source due to the temporal and spatial complementarity of wind and wave energy. Existing wind-wave complementary power generation systems can be divided into electric transmission, hydraulic transmission, and mechanical transmission types based on the energy transmission method, but all have significant drawbacks. First, with regard to the electric transmission type, although widely used, it relies on a large number of electrical components, resulting in complex circuit layout and high installation and maintenance costs. Furthermore, the functional limitations of electrical components make it difficult to efficiently regulate energy fluctuations, resulting in large energy losses. Heat generated during circuit transmission further exacerbates energy losses, resulting in low overall energy utilization.

[0003] Secondly, while hydraulic transmission systems solve the energy transmission loss problem, mismatched oil pressure levels during the energy coupling phase hinder the coordinated operation of the wind and wave energy capture subsystems. More critically, existing solutions fail to account for changes in sea conditions. When actual sea conditions deviate significantly from rated operating conditions, the system load and its own parameters cannot be matched, resulting in a significant decrease in energy utilization and reliability. Finally, mechanical transmission systems, due to their numerous mechanical parts, suffer from severe energy loss caused by friction and vibration during transmission, resulting in large fluctuations in output power and low energy capture efficiency. Furthermore, high maintenance costs limit their engineering applications, making them less commonly used in practical scenarios.

[0004] To sum up, the existing power generation system is limited by the transmission method or component function, and energy is significantly lost during the transmission and regulation process. The coupling between the wind energy and wave energy capture subsystems can easily lead to energy loss, low coordination efficiency, and the inability to dynamically adjust system parameters according to real-time sea conditions, resulting in an inability to balance energy utilization and reliability. At this stage, there is a need for a wind-wave complementary power generation system and method that can be used in variable sea conditions. Summary of the Invention

[0005] In order to solve the problems of large energy transmission and regulation losses, serious negative coupling of subsystems and insufficient adaptability to sea conditions in traditional offshore power generation systems, the present invention provides a wind-wave complementary power generation system and method that can be used in variable sea conditions.

[0006] In a first aspect, the present invention provides a wind-wave complementary power generation system that can be used in variable sea conditions, which adopts the following technical solutions:

[0007] A wind-wave complementary power generation system applicable to variable sea conditions, comprising:

[0008] A wind energy capture module, a wave energy capture module, an energy coupling power generation module, and a control module. The energy coupling power generation module is respectively connected to the wind energy capture module and the wave energy capture module to realize dual-source energy coupling drive. The control module is respectively connected to the wind energy capture module, the wave energy capture module, and the energy coupling power generation module.

[0009] The wind energy capture module includes a fan impeller, a hydraulic pump, a first accumulator and a first electromagnetic reversing valve. The fan impeller is connected to the hydraulic pump, and the hydraulic pump is respectively connected to the first accumulator and the first electromagnetic reversing valve. The wave energy capture module includes a hydraulic cylinder group, a one-way valve group, a second accumulator and a second electromagnetic reversing valve. The hydraulic cylinder group is respectively connected to the second accumulator and the second electromagnetic reversing valve through the one-way valve group. The energy coupling power generation module includes a gear group and a hydraulic motor group. The control module includes a wind speed sensor and a controller. The control signal of the controller is respectively connected to the first electromagnetic reversing valve and the second electromagnetic reversing valve.

[0010] Furthermore, the main shaft of the fan impeller is connected to the main shaft of the hydraulic pump through a coupling, the oil inlet of the hydraulic pump is connected to the oil tank through a first filter, the oil outlet of the hydraulic pump is connected in parallel to the first overflow valve, the first accumulator and the P port of the first solenoid reversing valve, the first solenoid reversing valve adopts a two-position three-way solenoid reversing valve, the T port of the first solenoid reversing valve is connected to the oil inlet of the hydraulic motor group, and the A port of the first solenoid reversing valve is connected to the oil inlet of the first main check valve.

[0011] Furthermore, the hydraulic motor group includes a first hydraulic motor, a second hydraulic motor, a third hydraulic motor and a fourth hydraulic motor, the oil inlet of the first hydraulic motor is connected to the T port of the first solenoid reversing valve, the oil outlet of the first hydraulic motor is connected to the oil tank, and the output shaft of the first hydraulic motor is connected to the gear shaft of the gear group.

[0012] Furthermore, the gear set includes a first driving gear, a second driving gear, a first driven gear and a second driven gear. The first driving gear and the second driving gear are fixed to their corresponding gear shafts with equal keys and are respectively connected to the first driven gear and the second driven gear. The gear circumference of the first driven gear is connected to the input shaft of the first generator, and the gear circumference of the second driven gear is connected to the input shaft of the second generator.

[0013] Furthermore, the piston rod of the hydraulic cylinder group is connected to a wave energy capture device outside the system, and the hydraulic cylinder group includes a first hydraulic cylinder, a second hydraulic cylinder and a third hydraulic cylinder, and the first hydraulic cylinder, the second hydraulic cylinder and the third hydraulic cylinder respectively correspond to a one-way valve group, and the one-way valve group includes a first one-way valve, a second one-way valve, a third one-way valve and a fourth one-way valve, and the first oil port of the first hydraulic cylinder is connected to the oil inlet of the first one-way valve and the oil outlet of the second one-way valve, and the second oil port of the first hydraulic cylinder is connected to the oil outlet of the third one-way valve and the oil inlet of the fourth one-way valve.

[0014] Furthermore, the first hydraulic cylinder, the second hydraulic cylinder and the third hydraulic cylinder merge different oil circuits into one oil circuit through a one-way valve group. The first hydraulic cylinder, the second hydraulic cylinder and the third hydraulic cylinder are all connected to the second overflow valve, the second accumulator and the P port of the second electromagnetic reversing valve through the merged oil circuit. The A port of the second electromagnetic reversing valve is connected to the oil inlet of the second main one-way valve. The T port of the second electromagnetic reversing valve is connected to the oil inlet of the fourth hydraulic motor. The output shaft of the fourth hydraulic motor is connected to the gear shaft of the second driving gear.

[0015] Furthermore, the energy coupling power generation module also includes a third solenoid reversing valve and a fourth solenoid reversing valve, and the third solenoid reversing valve and the fourth solenoid reversing valve both adopt two-position two-way solenoid reversing valves. The P port of the third solenoid reversing valve is connected to the oil inlet of the second hydraulic motor, and the P port of the fourth solenoid reversing valve is connected to the oil inlet of the third hydraulic motor.

[0016] Furthermore, the output shaft of the second hydraulic motor is connected to the driving plate of the first clutch, the output shaft of the third hydraulic motor is connected to the driving plate of the second clutch, the driven plate of the second clutch is connected to the gear shaft of the second driving gear, and the driven plate of the first clutch is connected to the gear shaft of the first driving gear.

[0017] Furthermore, the signal output end of the wind speed sensor is connected to the controller, the first signal output end of the controller is respectively connected to the first solenoid reversing valve, the second solenoid reversing valve, the third solenoid reversing valve and the fourth solenoid reversing valve, and the second signal output end of the controller is connected to the first clutch and the second clutch.

[0018] In a second aspect, a wind-wave complementary power generation method applicable to variable sea conditions comprises:

[0019] Collect wind speed signals, set wind speed thresholds, and classify sea conditions into high wind speed conditions, medium wind speed conditions, and low wind speed conditions based on the wind speed thresholds and wind speeds;

[0020] Under high wind speed conditions, the first and second electromagnetic reversing valves are in the left position, the wind energy hydraulic oil drives the first hydraulic motor through the T port, and the wave energy hydraulic oil drives the fourth hydraulic motor through the T port;

[0021] Under medium wind speed conditions, the first electromagnetic reversing valve is in the left position and the second electromagnetic reversing valve is in the right position. The wind energy hydraulic oil drives the first hydraulic motor, and the wave energy hydraulic oil drives the second hydraulic motor through port A and the second main check valve.

[0022] Under low wind speed conditions, the first electromagnetic reversing valve is in the right position and the second electromagnetic reversing valve is in the left position. The wind energy hydraulic oil drives the third hydraulic motor through port A and the first main check valve, and the wave energy hydraulic oil drives the fourth hydraulic motor.

[0023] In summary, the present invention has the following beneficial technical effects:

[0024] 1. The present invention simplifies the complexity of the system by combining hydraulic transmission with mechanical transmission. At the same time, it utilizes the characteristics of hydraulic accumulators, which have low energy loss and can efficiently adjust energy fluctuations, to improve energy transmission efficiency and reduce energy loss and fluctuations during transmission and adjustment.

[0025] 2. The present invention adopts a method of coupling energy by a synchronous gear mechanism by connecting the first and second driving gears to the output shaft of the hydraulic motor via a flat key, thereby reducing the negative coupling effect of the wind energy and wave energy capture subsystems caused by the difference in hydraulic system pressure levels, and ensuring the efficient operation of the system.

[0026] 3. In the present invention, the system can flexibly switch between "independent drive" and "coupled drive" modes through the two-position three-way structure of the first electromagnetic reversing valve and the second electromagnetic reversing valve. During independent drive, wind energy and wave energy directly drive the first hydraulic motor and the fourth hydraulic motor through the T port respectively, avoiding energy waste in the coupling link. During coupled drive, the hydraulic oil converges with the one-way valve group through the A port and drives the additional hydraulic motor through the third / fourth electromagnetic reversing valve, realizing dual-source torque superposition and effectively improving energy utilization.

[0027] 4. The present invention improves the adaptability of the wind-wave complementary power generation system to changing sea conditions by arranging two generators of different powers in parallel and adjusting the number of connected generators in real time according to changes in sea conditions, thereby improving the energy utilization rate and working reliability of the overall system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The figure is a schematic diagram of the overall structural connection of a wind-wave complementary power generation system that can be used in variable sea conditions according to an embodiment of the present invention.

[0029] Among them, 1. fan impeller; 2. hydraulic pump; 3. first filter; 4. oil tank; 5. first relief valve; 6. first accumulator; 7. wind speed sensor; 8. first solenoid reversing valve; 9. first main one-way valve; 10. second main one-way valve; 11. second solenoid reversing valve; 12. second relief valve; 13. second accumulator; 14. first hydraulic cylinder; 15. second hydraulic cylinder; 16. third hydraulic cylinder; 17. first one-way valve; 18. second one-way valve; 19. third one-way valve; 20. fourth one-way valve; 21. fifth one-way valve; 22. sixth one-way valve; 23. seventh one-way valve; 24. eighth one-way valve ; 25. Ninth one-way valve; 26. Tenth one-way valve; 27. Eleventh one-way valve; 28. Twelfth one-way valve; 29. Second filter; 30. Third filter; 31. Fourth filter; 32. First hydraulic motor; 33. Second hydraulic motor; 34. Third hydraulic motor; 35. Fourth hydraulic motor; 36. Third solenoid reversing valve; 37. Fourth solenoid reversing valve; 38. First driving gear; 39. First driven gear; 40. First clutch; 41. Second clutch; 42. Second driving gear; 43. Second driven gear; 44. Second generator; 45. First generator; 46. Controller. DETAILED DESCRIPTION

[0030] The present invention will be further described in detail below with reference to the accompanying drawings.

[0031] Example 1

[0032] Reference Figure 1 , a wind-wave complementary power generation system that can be used in variable sea conditions according to this embodiment includes:

[0033] A wind energy capture module, a wave energy capture module, an energy coupling power generation module, and a control module. The energy coupling power generation module is respectively connected to the wind energy capture module and the wave energy capture module to realize dual-source energy coupling drive. The control module is respectively connected to the wind energy capture module, the wave energy capture module, and the energy coupling power generation module.

[0034] The wind energy capture module includes a fan impeller 1, a hydraulic pump 2, a first accumulator 6 and a first electromagnetic reversing valve 8. The fan impeller 1 is connected to the hydraulic pump 2, and the hydraulic pump 2 is respectively connected to the first accumulator 6 and the first electromagnetic reversing valve 8. The wave energy capture module includes a hydraulic cylinder group, a one-way valve group, a second accumulator 13 and a second electromagnetic reversing valve 11. The hydraulic cylinder group is respectively connected to the second accumulator 13 and the second electromagnetic reversing valve 11 through the one-way valve group. The energy coupling power generation module includes a gear group and a hydraulic motor group. The control module includes a wind speed sensor 7 and a controller 46. The control signals of the controller 46 are respectively connected to the first electromagnetic reversing valve 8 and the second electromagnetic reversing valve 11.

[0035] Specifically, it includes the following:

[0036] like Figure 1 As shown in the figure, the main shaft of the fan impeller 1 and the main shaft of the hydraulic pump 2 are connected together through a coupling. When the wind drives the fan impeller 1 to rotate, the hydraulic pump 2 is driven to rotate, thereby converting wind energy into hydraulic energy. The input torque of the fan impeller main shaft is the ratio of the fan impeller captured power to the fan main shaft angular velocity:

[0037]

[0038] Where, T wind —Input torque of the fan main shaft, unit Nm; ω1—Angular velocity of the fan main shaft, unit rad / s; R—Radius of the fan impeller, unit m; λ—Tip speed ratio; β—Pitch angle of the fan blade; V—Wind speed, unit m / s; ρ—Density of wind, unit kg / m 3 ; S—the swept area of the fan impeller, unit m 2 , C p —Wind energy utilization coefficient, wind energy utilization coefficient C p It is related to the tip speed ratio λ and the pitch angle β. According to the empirical formula:

[0039]

[0040] The mechanical reaction torque of the hydraulic pump can be calculated from the hydraulic system pressure and the hydraulic pump displacement:

[0041]

[0042] Where, T b —Mechanical reaction torque of the hydraulic pump 1, in Nm; η b1 —The mechanical efficiency of the hydraulic pump 1 is generally 85% to 95%; P W —Hydraulic system pressure of wind energy capture system, unit: Pa; D b1 —Hydraulic pump displacement, unit: L / rev.

[0043] The oil inlet of the hydraulic pump 2 is connected to the oil outlet of the first filter 3, and the oil inlet of the first filter 3 is connected to the oil tank 4; when the hydraulic pump 2 is working, the hydraulic oil is sucked out of the oil tank 4, filtered by the first filter 3 and then enters the hydraulic pump 2. The outlet of the hydraulic pump 2 is connected to the first relief valve 5 and the first accumulator 6. The first relief valve 5 is used to limit the maximum pressure in the wind energy capture subsystem pipeline. When the circuit oil pressure reaches the set value, its valve port opens to introduce excess hydraulic oil into the oil tank 4, thereby protecting the system. The first accumulator 6 is used to control the fluctuation of the internal pressure and flow of the pipeline. When the hydraulic oil pressure exceeds its internal inflation pressure, the internal air bag is compressed and the excess energy is converted into potential energy; on the contrary, when the hydraulic oil pressure is lower than its internal inflation pressure, the internal air bag is restored and the stored energy is released, thereby achieving stable regulation of the internal pressure and flow of the pipeline.

[0044] The first solenoid reversing valve 8 adopts a two-position three-way solenoid reversing valve. The P port of the first solenoid reversing valve 8 is connected to the oil outlet of the hydraulic pump 2, the T port is connected to the oil inlet of the first hydraulic motor 32, and the A port is connected to the oil inlet of the first main check valve 9. When the first solenoid reversing valve 8 is in the left position, the P port is connected to the T port, and the P port is disconnected from the A port. The oil flows from the oil outlet of the hydraulic pump 2 through the first solenoid reversing valve 8 to the oil inlet of the hydraulic motor 32; when the first solenoid reversing valve 8 is in the right position, the P port is disconnected from the T port, and the P port is connected to the A port. The oil flows from the oil outlet of the hydraulic pump 2 through the first solenoid reversing valve 8 to the oil inlet of the first main check valve 9.

[0045] The oil inlet of the first hydraulic motor 32 is connected to the T port of the first electromagnetic reversing valve 8, and its oil outlet is connected to the oil tank 4. The hydraulic oil drives the first hydraulic motor 32 to rotate through the first electromagnetic reversing valve 8 and is then discharged back to the oil tank 4. After the hydraulic oil is regulated by the first accumulator 6, the relationship between the hydraulic system pressure, the hydraulic motor displacement, and the hydraulic motor output torque is as follows:

[0046]

[0047] Where: T m is the output torque of the hydraulic motor; P is the hydraulic system pressure; V m is the hydraulic motor displacement, and its pressure value remains basically stable. Therefore, from the relationship between the system pressure, the hydraulic motor displacement, and the hydraulic motor output torque, it can be seen that the output torque of the first hydraulic motor will remain basically stable. The output shaft of the first hydraulic motor 32 is connected to the gear shaft of the first driving gear 38. When the fourth hydraulic motor 35 rotates, the torque it outputs acts on the first driving gear 38 to drive the first driving gear 38 to rotate.

[0048] For the convenience of description, the one-way valve group corresponding to the hydraulic cylinder group is divided into twelve one-way valves, and they are numbered respectively. The first oil port of the first hydraulic cylinder 14 is connected to the first one-way valve 17 and the second one-way valve 18, and the second oil port is connected to the third one-way valve 19 and the fourth one-way valve 20. The piston rod of the first hydraulic cylinder 14 is connected to the wave energy capture device outside the system; the oil inlet of the second one-way valve 18 and the third one-way valve 19 is connected to the second filter 29, and the oil inlet of the second filter 29 is connected to the oil tank 4. Driven by the waves, the wave energy capture device starts to work and drives the piston of the first hydraulic cylinder 14 connected to it to start moving. Reciprocating motion, when the piston of the first hydraulic cylinder 14 moves upward, the second one-way valve 18 and the fourth one-way valve 20 are closed, the first one-way valve 17 and the third one-way valve 19 are opened, and the hydraulic oil passes through the second filter 29 and enters the lower chamber of the first hydraulic cylinder 14. At the same time, the hydraulic oil in the upper chamber of the first hydraulic cylinder 14 is discharged. When the piston of the first hydraulic cylinder 14 moves downward, the first one-way valve 17 and the third one-way valve 19 are closed, the second one-way valve 18 and the fourth one-way valve 20 are opened, and the hydraulic oil passes through the second filter 29 and enters the upper chamber of the first hydraulic cylinder 14. At the same time, the hydraulic oil in the lower chamber of the first hydraulic cylinder 14 is discharged.

[0049] Similarly, the first oil port of the second hydraulic cylinder 15 is connected to the fifth one-way valve 21 and the sixth one-way valve 22, and the second oil port is connected to the seventh one-way valve 23 and the eighth one-way valve 24. The piston rod of the second hydraulic cylinder 15 is connected to the wave energy capture device outside the system, and the oil inlet of the sixth one-way valve 22 and the seventh one-way valve 23 is connected to the third filter 30, and the oil inlet of the third filter 30 is connected to the oil tank. Driven by the waves, the wave energy capture device starts to work and drives the piston of the second hydraulic cylinder 15 connected thereto to start reciprocating motion. When the piston of the second hydraulic cylinder 15 moves upward When the piston of the second hydraulic cylinder 15 moves downward, the fifth one-way valve 21 and the seventh one-way valve 23 are closed, the fifth one-way valve 21 and the seventh one-way valve 23 are opened, and the hydraulic oil is filtered by the third filter 30 and enters the lower chamber of the second hydraulic cylinder 15. At the same time, the hydraulic oil in the upper chamber of the second hydraulic cylinder 15 is discharged. When the piston of the second hydraulic cylinder 15 moves downward, the fifth one-way valve 21 and the seventh one-way valve 23 are closed, the sixth one-way valve 22 and the eighth one-way valve 24 are opened, and the hydraulic oil is filtered by the third filter 30 and enters the upper chamber of the second hydraulic cylinder 15. At the same time, the hydraulic oil in the lower chamber of the second hydraulic cylinder 15 is discharged.

[0050] The first oil port of the third hydraulic cylinder 16 is connected to the ninth one-way valve 25 and the tenth one-way valve 26, and the second oil port is connected to the eleventh one-way valve 27 and the twelfth one-way valve 28. The piston rod of the third hydraulic cylinder 16 is connected to the wave energy capture device outside the system. The oil inlet of the tenth one-way valve 26 and the eleventh one-way valve 27 is connected to the fourth filter 31, and the oil inlet of the fourth filter 31 is connected to the oil tank 4. Driven by the waves, the wave energy capture device starts to work and drives the piston of the third hydraulic cylinder 16 connected thereto to start reciprocating motion. When the piston of the third hydraulic cylinder 16 moves upward , the tenth one-way valve 26 and the twelfth one-way valve 28 are closed, the ninth one-way valve 25 and the eleventh one-way valve 27 are opened, the hydraulic oil is filtered through the fourth filter 31, and enters the lower chamber of the third hydraulic cylinder 16. At the same time, the hydraulic oil in the upper chamber of the third hydraulic cylinder 16 is discharged. When the piston of the third hydraulic cylinder 16 moves downward, the ninth one-way valve 25 and the eleventh one-way valve 27 are closed, the tenth one-way valve 26 and the twelfth one-way valve 28 are opened, the hydraulic oil is filtered through the fourth filter 31, and enters the upper chamber of the third hydraulic cylinder 16. At the same time, the hydraulic oil in the lower chamber of the third hydraulic cylinder 16 is discharged.

[0051] The oil circuits of the first hydraulic cylinder 14, the second hydraulic cylinder 15 and the third hydraulic cylinder 16 are merged into one circuit and connected to the second relief valve 12 and the second accumulator 13. The displacement phase difference of the pistons of the three hydraulic cylinders is 120°, thereby achieving complementarity between the output oils. The second relief valve 12 is used to limit the maximum pressure in the wave energy capture subsystem pipeline. When the circuit oil pressure reaches the set value, its valve port opens to introduce excess hydraulic oil into the oil tank 4, thereby playing a protective role. The second accumulator 13 is used to control the fluctuation of the internal pressure and flow of the pipeline. When the hydraulic oil pressure exceeds its internal inflation pressure, the internal air bag is compressed and the excess energy is converted into potential energy; conversely, when the hydraulic oil pressure is lower than its internal inflation pressure, the internal air bag is restored and the stored energy is released, thereby achieving stable regulation of the internal pressure and flow of the pipeline.

[0052] The second solenoid reversing valve 11 also adopts a two-position three-way solenoid reversing valve. The P port of the second solenoid reversing valve 11 is connected to the oil outlet of the second accumulator 13, the T port is connected to the oil inlet of the fourth hydraulic motor 35, and the A port is connected to the oil inlet of the second main check valve 10. When the second solenoid reversing valve 11 is in the left position, the P port is connected to the T port, and the P port is disconnected from the A port. The oil flows from the oil outlet of the second accumulator 13 through the first solenoid reversing valve 8 to the oil inlet of the fourth hydraulic motor 35; when the second solenoid reversing valve 11 is in the right position, the P port is disconnected from the T port, and the P port is connected to the A port. The oil flows from the oil outlet of the second accumulator 13 through the second solenoid reversing valve 11 to the oil inlet of the second main check valve 10.

[0053] The oil inlet of the fourth hydraulic motor 35 is connected to the T port of the second electromagnetic reversing valve 11, and the oil outlet is connected to the oil tank 4; the hydraulic oil drives the fourth hydraulic motor 35 to rotate through the second electromagnetic reversing valve 11, and is then discharged back to the oil tank 4. After the hydraulic oil is adjusted by the second accumulator 13, its pressure value remains basically stable. Therefore, from the relationship between the system pressure, the hydraulic motor displacement, and the hydraulic motor output torque, it can be seen that the output torque of the fourth hydraulic motor 35 will remain basically stable.

[0054] The third solenoid reversing valve 36 adopts a two-position two-way solenoid reversing valve, whose A port is connected to the oil outlet of the second main check valve 10, and the P port is connected to the oil inlet of the second hydraulic motor 33. When the two-position two-way solenoid reversing valve is in the upper position, the A port and the P port are disconnected; when the two-position two-way solenoid reversing valve is in the lower position, the A port and the P port are connected.

[0055] The oil inlet of the second hydraulic motor 33 is connected to the P port of the third electromagnetic reversing valve 36, and its oil outlet is connected to the oil tank 4. The hydraulic oil flowing out of the second main check valve 10 drives the second hydraulic motor 33 to rotate after passing through the third electromagnetic reversing valve 36, and is then discharged back to the oil tank 4. After the hydraulic oil is adjusted by the second accumulator 13, its pressure value remains basically stable. Therefore, from the relationship between the system pressure, the hydraulic motor displacement, and the hydraulic motor output torque, it can be seen that the output torque of the second hydraulic motor 33 will remain basically stable.

[0056] The output shaft of the second hydraulic motor 33 is connected to the driving plate of the first clutch 40. When the hydraulic motor rotates, the torque it outputs acts on the driving plate of the first clutch 40 to drive the driving plate of the first clutch 40 to rotate. The driven plate of the first clutch 40 is connected to the gear shaft of the first driving gear 38. When the driving plate and the driven plate of the first clutch 40 are in an engaged state, the torque output by the second hydraulic motor 33 will be transmitted to the first driving gear 38 through the first clutch 40. When the driving plate of the first clutch 40 and its driven plate are in a disengaged state, the movements between the second hydraulic motor 33 and the first driving gear 38 do not affect each other.

[0057] Both ends of the gear shaft of the first driving gear 38 are respectively connected to the output shaft of the first hydraulic motor 32 and the driven plate of the first clutch 40, and cooperate with the first driven gear 39 to form a gear pair. When the first clutch 40 is in the engaged state, the first driving gear 38 simultaneously receives the torque transmitted from the first hydraulic motor 32 and the second hydraulic motor 33, and transmits it to the first driven gear 39 through the gear pair; when the first clutch 40 is in the disengaged state, the driving gear only receives the torque from the first hydraulic motor 32, and transmits it to the first driven gear 39 through the gear width.

[0058] The gear shaft of the first driven gear 39 is connected to the input shaft of the first generator 45, thereby driving the first generator 45 to work. The first generator 45 and the second generator 44 are two generators with different powers. According to the changes in the wind conditions at sea, the two generators can be connected at the same time or only one of the generators can be connected. The fourth solenoid reversing valve 37 adopts a two-position two-way solenoid reversing valve, whose A port is connected to the oil outlet of the first main check valve 9, and the P port is connected to the oil inlet of the third hydraulic motor 34. When the fourth solenoid reversing valve 37 is in the upper position, the A port and the P port are connected; when the fourth solenoid reversing valve 37 is in the lower position, the A port and the P port are disconnected.

[0059] The oil inlet of the third hydraulic motor 34 is connected to the P port of the fourth electromagnetic reversing valve 37, and its oil outlet is connected to the oil tank 4. The hydraulic oil flowing out of the first main one-way valve 9 drives the third hydraulic motor 34 to rotate after passing through the fourth electromagnetic reversing valve 37, and is then discharged back to the oil tank 4. After the hydraulic oil is adjusted by the first accumulator 6, its pressure value remains basically stable. Therefore, from the relationship between the system pressure, the hydraulic motor displacement, and the hydraulic motor output torque, it can be seen that the output torque of the third hydraulic motor 34 will remain basically stable.

[0060] The output shaft of the third hydraulic motor 34 is connected to the driving plate of the second clutch 41. When the third hydraulic motor 34 rotates, the torque it outputs acts on the driving plate of the second clutch 41 to drive the driving plate of the second clutch 41 to rotate. The driven plate of the second clutch 41 is connected to the gear shaft of the second driving gear 42. When the driving plate and the driven plate of the second clutch 41 are in an engaged state, the torque output by the third hydraulic motor 34 will be transmitted to the second driving gear 42 through the second clutch 41. When the driving plate and the driven plate of the second clutch 41 are in a disengaged state, the movements between the third hydraulic motor 34 and the second driving gear 42 do not affect each other.

[0061] The two ends of the gear shaft of the second driving gear 42 are respectively connected to the output shaft of the third hydraulic motor 34 and the driven plate of the second clutch 41, and cooperate with the second driven gear 43 to form a gear pair. When the second clutch 41 is in the engaged state, the second driving gear 42 simultaneously receives torque transmitted from the third hydraulic motor 34 and the fourth hydraulic motor 35, and transmits it to the second driven gear 43 through the gear pair; when the second clutch 41 is in the disengaged state, the driving gear only receives torque from the fourth hydraulic motor 35, and transmits it to the second driven gear 43 through the gear width. The gear shaft of the second driven gear 43 is connected to the input shaft of the second generator 44, thereby driving the second generator 44 to operate. When the second clutch 41 is in the engaged state, the second driving gear 42 simultaneously receives torque transmitted from the third hydraulic motor 34 and the fourth hydraulic motor 35. Ignoring oil leakage in the hydraulic pipeline and when the relief valve is not open, the flow rate entering the hydraulic motor is equal to the flow rate discharged by the hydraulic cylinder minus the flow rate entering the accumulator, that is:

[0062] Q m1 =Q d -Q i1 Q m1 =Q d -Q i1 ,

[0063] Ignoring the compressibility of the oil and oil leakage, the flow continuity equation of the hydraulic motor is:

[0064]

[0065] Where η m1 —Volume efficiency of hydraulic motor is generally 80% to 95%; D m1 —Hydraulic motor displacement, unit L / rev; n m1 —Hydraulic motor spindle speed, unit: r / min.

[0066] Then the angular velocity of the hydraulic motor spindle is:

[0067]

[0068] Where, ω m1 —Hydraulic motor angular velocity, in rad / s.

[0069] The output torque of the hydraulic motor is:

[0070]

[0071] Where, T m1 —Hydraulic motor output torque, unit Nm; η m1 —The mechanical efficiency of the hydraulic motor is generally 90%.

[0072] The torque output by the hydraulic motor is transmitted to the driven gear through the gear pair; when the second clutch 41 is in the disengaged state, the driving gear only receives the torque from the fourth hydraulic motor 35 and transmits it to the second driven gear 43 through the gear width. The gear shaft of the second driven gear 43 is connected to the input shaft of the second generator 44, thereby driving the second generator 44 to work.

[0073] The second generator 44 is a permanent magnet synchronous generator, and its power generation calculation formula is:

[0074]

[0075] Where, E is the electromotive force of the generator, in V; R L —Equivalent resistance, unit Ω; T G1 —Electromagnetic torque of the generator, in Nm; ω G1 —Generator rotor speed, in rad / s.

[0076]

[0077] The electromotive force of the permanent magnet synchronous generator is:

[0078]

[0079] Where, N is the number of winding turns in series; k e —Electromotive force winding factor; u—number of armature winding pole pairs; Φ—magnetic flux, unit Wb; n G —Generator rotor speed, unit: r / min.

[0080] Therefore, the electromagnetic resistance torque of the permanent magnet synchronous generator can be calculated from the rotor speed:

[0081]

[0082] The hydraulic motor rotor and the generator rotor are connected through a coupling. The force balance equation of the generator main shaft rotor is:

[0083]

[0084] Where, J E —Equivalent moment of inertia of generator rotor, unit: kgm2; B G1 —Viscous damping, unit: N / (m / s). By selecting first generator 45 and second generator 44 with different rated powers, it is possible to choose to connect both generators simultaneously or only one of them according to the change of offshore wind conditions.

[0085] The controller 46 receives the wind speed data transmitted by the wind speed sensor 7, and controls the working positions of the first solenoid reversing valve 8, the second solenoid reversing valve 11, the third solenoid reversing valve 36, and the fourth solenoid reversing valve 37 in the system according to the wind speed conditions, and controls the on and off of the first clutch 40 and the second clutch 41.

[0086] Example 2

[0087] This embodiment differs from the first embodiment in that it provides a wind-wave complementary power generation method applicable to variable sea conditions, including:

[0088] First, set the maximum wind speed threshold V high and the minimum wind speed threshold V mid , when the wind speed is greater than the maximum wind speed threshold V high , defined as a high wind speed working condition, when the wind speed measured by the wind speed sensor 7 is large, the controller 46 controls the first electromagnetic reversing valve 8 and the second electromagnetic reversing valve 11 to work in the left position, and controls the first clutch 40 and the second clutch 41 to be in the disconnected state. The high-pressure oil of the wind energy capture system impacts the first hydraulic motor 32 through the first accumulator 6, and the first driving gear 38 only bears the torque transmitted by the first hydraulic motor 32, and drives the first generator 45 to generate electricity through the first driven gear 39. The high-pressure oil in the wave energy capture system is stored and stabilized in the second accumulator 13 and then impacts the fourth hydraulic motor 35. The second driving gear 42 only bears the torque transmitted by the fourth hydraulic motor 35, and drives the second generator 44 to generate electricity through the second driven gear 43. Activating two generators at the same time can avoid the adverse effects of excessive load on the system and can keep both generators in the rated working state.

[0089] When the wind speed measured by the wind speed sensor 7 is moderate, that is, greater than the minimum wind speed threshold V mid , which is less than the maximum wind speed threshold, the controller 46 controls the first electromagnetic reversing valve 8 to operate in the left position, the second electromagnetic reversing valve 11 to operate in the right position, the third electromagnetic reversing valve 36 to operate in the lower position, the third electromagnetic reversing valve 36 to operate in the lower position, and the fourth electromagnetic reversing valve 37 to operate in the lower position. The first clutch 40 is controlled to be engaged and the second clutch 41 to be disengaged. The high-pressure oil of the wind energy capture system is stored and stabilized in the first accumulator 6 and then impacts the first hydraulic motor 32. The high-pressure oil of the wave energy capture system is stored and stabilized in the second accumulator 13 and then impacts the second hydraulic motor 33. The first driving gear 38 simultaneously bears the torque transmitted by the first hydraulic motor 32 and the second hydraulic motor 33, and drives the first generator 45 to generate electricity through the first driven gear 39, so that the first generator 45 operates near the rated power, greatly improving the energy utilization rate. At this time, the second generator 44 is in a shutdown state.

[0090] When the wind speed measured by the wind speed sensor 7 is very small, that is, less than the minimum wind speed threshold V mid The controller 46 controls the first electromagnetic reversing valve 8 to work in the right position, the second electromagnetic reversing valve 11 to work in the left position, the third electromagnetic reversing valve 36 to work in the upper position, the third electromagnetic reversing valve 36 to work in the upper position, and the fourth electromagnetic reversing valve 37 to work in the upper position, controls the first clutch 40 to be in the disconnected state, and the second clutch 41 to be in the engaged state. The high-pressure oil of the wind energy capture system is stored and stabilized by the first accumulator 6 and then impacts the third hydraulic motor 34. The high-pressure oil of the wave energy capture system is stored and stabilized by the second accumulator 13 and then impacts the fourth hydraulic motor 35. The second driving gear 42 simultaneously bears the torque transmitted by the third hydraulic motor 34 and the fourth hydraulic motor 35, and drives the second generator 44 to generate electricity through the second driven gear 43, so that the second generator 44 operates near the rated power, greatly improving the energy utilization rate. At this time, the first generator 45 is in the shutdown state.

[0091] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A wind-wave complementary power generation system that can be used in variable sea conditions, characterized in that: include: A wind energy capture module, a wave energy capture module, an energy coupling power generation module, and a control module. The energy coupling power generation module is respectively connected to the wind energy capture module and the wave energy capture module to realize dual-source energy coupling drive. The control module is respectively connected to the wind energy capture module, the wave energy capture module, and the energy coupling power generation module. The wind energy capture module comprises a fan impeller (1), a hydraulic pump (2), a first accumulator (6) and a first electromagnetic reversing valve (8); the fan impeller (1) is connected to the hydraulic pump (2); the hydraulic pump (2) is respectively connected to the first accumulator (6) and the first electromagnetic reversing valve (8); the wave energy capture module comprises a hydraulic cylinder group, a one-way valve group, a second accumulator (13) and a second electromagnetic reversing valve (11); the hydraulic cylinder group is respectively connected to the second accumulator (13) and the second electromagnetic reversing valve (11) through the one-way valve group; the energy coupling power generation module comprises a gear group and a hydraulic motor group; the control module comprises a wind speed sensor (7) and a controller (46); the control signal of the controller (46) is respectively connected to the first electromagnetic reversing valve (8) and the second electromagnetic reversing valve (11).

2. The wind-wave complementary power generation system applicable to variable sea conditions according to claim 1, characterized in that: The main shaft of the fan impeller (1) is connected to the main shaft of the hydraulic pump (2) through a coupling, the oil inlet of the hydraulic pump (2) is connected to the oil tank (4) through a first filter (3), the oil outlet of the hydraulic pump (2) is connected in parallel to the first overflow valve (5), the first accumulator (6) and the P port of the first electromagnetic reversing valve (8), the first electromagnetic reversing valve (8) adopts a two-position three-way electromagnetic reversing valve, the T port of the first electromagnetic reversing valve (8) is connected to the oil inlet of the hydraulic motor group, and the A port of the first electromagnetic reversing valve (8) is connected to the oil inlet of the first main check valve (9).

3. The wind-wave complementary power generation system applicable to variable sea conditions according to claim 1, characterized in that: The hydraulic motor group comprises a first hydraulic motor (32), a second hydraulic motor (33), a third hydraulic motor (34) and a fourth hydraulic motor (35); an oil inlet of the first hydraulic motor (32) is connected to the T port of the first electromagnetic reversing valve (8); an oil outlet of the first hydraulic motor (32) is connected to the oil tank (4); and an output shaft of the first hydraulic motor (32) is connected to the gear shaft of the gear group.

4. The wind-wave complementary power generation system applicable to variable sea conditions according to claim 1, characterized in that: The gear set includes a first driving gear (38), a second driving gear (42), a first driven gear (39) and a second driven gear (43). The first driving gear (38) and the second driving gear (42) are fixed to their corresponding gear shafts with parallel keys and are respectively connected to the first driven gear (39) and the second driven gear (43). The gear circumference of the first driven gear (39) is connected to the input shaft of the first generator (45), and the gear circumference of the second driven gear (43) is connected to the input shaft of the second generator (44).

5. The wind-wave complementary power generation system applicable to variable sea conditions according to claim 1, characterized in that: The piston rod of the hydraulic cylinder group is connected to a wave energy capture device outside the system. The hydraulic cylinder group includes a first hydraulic cylinder (14), a second hydraulic cylinder (15) and a third hydraulic cylinder (16). The first hydraulic cylinder (14), the second hydraulic cylinder (15) and the third hydraulic cylinder (16) respectively correspond to a one-way valve group. The one-way valve group includes a first one-way valve (17), a second one-way valve (18), a third one-way valve (19) and a fourth one-way valve (20). The first oil port of the first hydraulic cylinder (14) is connected to the oil inlet of the first one-way valve (17) and the oil outlet of the second one-way valve (18). The second oil port of the first hydraulic cylinder (14) is connected to the oil outlet of the third one-way valve (19) and the oil inlet of the fourth one-way valve (20).

6. The wind-wave complementary power generation system applicable to variable sea conditions according to claim 5, characterized in that: The first hydraulic cylinder (14), the second hydraulic cylinder (15) and the third hydraulic cylinder (16) merge different oil circuits into one oil circuit through a one-way valve group. The first hydraulic cylinder (14), the second hydraulic cylinder (15) and the third hydraulic cylinder (16) are connected to the second overflow valve (12), the second accumulator (13) and the P port of the second electromagnetic reversing valve (11) through the merged oil circuit. The A port of the second electromagnetic reversing valve (11) is connected to the oil inlet of the second main one-way valve (10). The T port of the second electromagnetic reversing valve (11) is connected to the oil inlet of the fourth hydraulic motor (35). The output shaft of the fourth hydraulic motor (35) is connected to the gear shaft of the second driving gear (42).

7. The wind-wave complementary power generation system applicable to variable sea conditions according to claim 1, characterized in that: The energy coupling power generation module further includes a third electromagnetic reversing valve (36) and a fourth electromagnetic reversing valve (37). Both the third electromagnetic reversing valve (36) and the fourth electromagnetic reversing valve (37) are two-position two-way electromagnetic reversing valves. The P port of the third electromagnetic reversing valve (36) is connected to the oil inlet of the second hydraulic motor (33), and the P port of the fourth electromagnetic reversing valve (37) is connected to the oil inlet of the third hydraulic motor (34).

8. The wind-wave complementary power generation system applicable to variable sea conditions according to claim 3 is characterized in that: The output shaft of the second hydraulic motor (33) is connected to the driving disc of the first clutch (40), the output shaft of the third hydraulic motor (34) is connected to the driving disc of the second clutch (41), the driven disc of the second clutch (41) is connected to the gear shaft of the second driving gear (42), and the driven disc of the first clutch (40) is connected to the gear shaft of the first driving gear (38).

9. The wind-wave complementary power generation system applicable to variable sea conditions according to claim 1, characterized in that: The signal output end of the wind speed sensor (7) is connected to the controller (46), the first signal output end of the controller (46) is respectively connected to the first electromagnetic reversing valve (8), the second electromagnetic reversing valve (11), the third electromagnetic reversing valve (36) and the fourth electromagnetic reversing valve (37), and the second signal output end of the controller (46) is connected to the first clutch (40) and the second clutch (41).

10. A wind-wave complementary power generation method applicable to variable sea conditions, based on the system of claim 1, characterized in that: include: Collect wind speed signals, set wind speed thresholds, and classify sea conditions into high wind speed conditions, medium wind speed conditions, and low wind speed conditions based on the wind speed thresholds and wind speeds; Under high wind speed conditions, the first electromagnetic reversing valve (8) and the second electromagnetic reversing valve (11) are in the left position, the wind energy hydraulic oil drives the first hydraulic motor (32) through the T port, and the wave energy hydraulic oil drives the fourth hydraulic motor (35) through the T port; Under medium wind speed conditions, the first electromagnetic reversing valve (8) is in the left position and the second electromagnetic reversing valve (11) is in the right position, the wind energy hydraulic oil drives the first hydraulic motor (32), and the wave energy hydraulic oil drives the second hydraulic motor (33) through port A and the second main check valve (10); Under low wind speed conditions, the first electromagnetic reversing valve (8) is in the right position and the second electromagnetic reversing valve (11) is in the left position, and the wind energy hydraulic oil drives the third hydraulic motor (34) through the A port and the first main check valve (9), while the wave energy hydraulic oil drives the fourth hydraulic motor (35).

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