An ultra-compact integrated dual-wind-rotor wind turbine transmission chain structure and control method thereof

Abstract

The present invention provides an ultra-compact integrated dual-wind-rotor wind turbine transmission chain structure and a control method thereof, wherein a yaw system is installed at the top of a tower, a first planetary gear transmission mechanism is arranged on one side of the top of the yaw system, the first planetary gear transmission mechanism is connected to the large impeller, the first planetary gear transmission mechanism is connected to the first parallel gear transmission mechanism; the first parallel gear transmission mechanism is connected to the first generator and the second generator; a second planetary gear transmission mechanism is arranged on the other side of the top of the yaw system, the second planetary gear transmission mechanism is connected to the small impeller, the second planetary gear transmission mechanism is connected to the second parallel gear transmission mechanism, the second parallel gear transmission mechanism is connected to the first generator through an electromagnetic clutch, and the second parallel gear transmission mechanism is connected to the motor at the same time. This transmission chain can realize reliable, safe, efficient and stable operation, effectively shorten the transmission distance of the transmission chain of the dual-wind-rotor wind turbine set, and expand the wind speed range of effective power generation of the dual-wind-rotor wind turbine set.

Description

Technical Field

[0001] The present invention relates to the field of wind power generation, and in particular to an ultra-compact integrated dual-wind-rotor wind turbine transmission chain structure and a control method thereof. Background Art

[0002] With severe regional conflicts and intensified energy crises, accelerating the development and utilization of renewable energy has become an inevitable choice for mankind to solve survival problems. Wind energy, as a clean and environmentally friendly renewable resource, has been widely valued by countries around the world. In order to fully develop and utilize wind energy, wind turbines are developing towards large-scale and high-efficiency trends. As a new type of wind power generation equipment, the dual-rotor wind turbine has a novel design concept. Compared with the traditional single-rotor wind turbine, it can greatly save land, increase the swept area of ​​the wind turbine, and improve the power generation and efficiency of the wind turbine, and has broad development prospects.

[0003] The newly installed capacity of wind power generation in the world continues to rise. The power generation efficiency of the most widely used single-rotor wind turbines in the world is relatively low. With the development of wind power generation technology, dual-rotor wind turbines have unique advantages. This paper proposes a new dual-rotor wind turbine transmission chain with compact structure and smooth transmission. It can adapt to low wind speed areas. It is of great significance to develop dual-rotor wind power generation devices with high power generation efficiency and high utilization efficiency of low wind speed wind energy resources to promote the development of dual-rotor wind turbines.

[0004] Compared with traditional single-impeller wind turbines, dual-impeller wind turbines can reduce the cost of a single unit by 10%. The energy utilization efficiency of the dual-impeller unit is 15% higher than that of the traditional single-impeller unit. The size of the wind turbine impeller is reduced by about 40%, and the wind energy capture power per unit swept area under rated power is increased to about twice the original. In a wind farm of the same area, the use of dual-impeller wind turbines can significantly increase the number of units and power generation by more than 50%, saving a lot of land resources. Dual-impeller wind turbines have lower requirements for materials, manufacturing, transportation, installation, and maintenance, and the cost is reduced accordingly, and the application prospects are extremely broad. Summary of the invention

[0005] The purpose of the present invention is to provide an ultra-compact integrated dual-rotor wind turbine transmission chain structure and a control method thereof, wherein the transmission chain can achieve reliable, safe, efficient and stable operation, effectively shorten the transmission distance of the dual-rotor wind turbine transmission chain, expand the wind speed range for effective power generation of the dual-rotor wind turbine, and improve the wind energy capture efficiency and power generation of the dual-rotor wind turbine.

[0006] In order to achieve the above-mentioned technical features, the purpose of the present invention is achieved as follows: an ultra-compact integrated dual-rotor wind turbine drive chain structure, which includes a tower, a yaw system is installed on the top of the tower, a first planetary gear transmission mechanism is arranged on the top side of the yaw system, the first planetary gear transmission mechanism is connected to the large impeller, and the first planetary gear transmission mechanism is connected to the first parallel-stage gear transmission mechanism; the first parallel-stage gear transmission mechanism is connected to the first generator and the second generator; a second planetary gear transmission mechanism is arranged on the other side of the top of the yaw system, the second planetary gear transmission mechanism is connected to the small impeller, and the second planetary gear transmission mechanism is connected to the second parallel-stage gear transmission mechanism, the second parallel-stage gear transmission mechanism is connected to the first generator through an electromagnetic clutch, and the second parallel-stage gear transmission mechanism is connected to the motor at the same time.

[0007] The first planetary gear transmission mechanism includes a first planetary gear transmission sun gear, a first planetary gear transmission planetary gear, a first planetary gear transmission planetary carrier, a first planetary gear transmission internal gear ring, a second planetary gear transmission sun gear, a second planetary gear transmission planetary gear, a second planetary gear transmission planetary carrier and a second planetary gear transmission internal gear ring; the large impeller is connected to the first planetary gear transmission planetary carrier, the second planetary gear transmission sun gear is connected to the first large gear of the first parallel-stage gear transmission mechanism, and power is input from the first planetary gear transmission planetary carrier and output by the second planetary gear transmission sun gear.

[0008] The second planetary gear transmission mechanism includes a third planetary gear transmission sun gear, a third planetary gear transmission planetary gear, a third planetary gear transmission planetary carrier, a third planetary gear transmission internal gear ring, a fourth planetary gear transmission sun gear, a fourth planetary gear transmission planetary gear, a fourth planetary gear transmission planetary carrier and a fourth planetary gear transmission internal gear ring; the small impeller is connected to the third planetary gear transmission planetary carrier, the fourth planetary gear transmission sun gear is connected to the second largest gear of the second parallel-stage gear transmission mechanism, and power is input from the third planetary gear transmission planetary carrier and output by the fourth planetary gear transmission sun gear.

[0009] The first parallel-stage gear transmission mechanism comprises a first large gear, a first small gear and a second small gear; the first large gear externally meshes with the first small gear and the second small gear; the first small gear and the second small gear are connected to an input shaft at one end of the first generator.

[0010] The second parallel gear transmission mechanism comprises a second large gear, a third small gear and a fourth small gear; the second large gear is externally meshed with the third small gear and the fourth small gear; the third small gear and the fourth small gear are connected to an input shaft at one end of the second generator.

[0011] The first generator comprises a first generator rotor, a first generator stator, a first output coil, a first front end cover, a first rear end cover and a first generator bearing; the other end of the first generator is connected to an electromagnetic clutch;

[0012] The second generator comprises a second generator rotor, a second generator stator, a second output coil, a second front end cover, a second rear end cover and a second generator bearing; the other end of the second generator is connected to the electric motor.

[0013] The electromagnetic clutch is used to connect or disconnect the power between the first generator and the second parallel-stage gear transmission mechanism to adapt to different wind conditions;

[0014] When the wind speed is lower than the cut-in wind speed, the electromagnetic clutch disconnects the power transmission between the first generator and the second parallel-stage gear transmission mechanism, and the electric motor provides power to the large impeller and the small impeller, thereby additionally supplementing the power required for the rotation of the large impeller and the small impeller;

[0015] When the wind speed is higher than the cut-in wind speed but lower than the rated wind speed, the electromagnetic clutch transmits the power between the first generator and the second parallel-stage gear transmission mechanism. At this time, the first generator and the second generator generate electricity at the same time, and the electric motor supplements the power required for the rotation of the large impeller and the small impeller.

[0016] When the wind speed is higher than the rated wind speed but lower than the cut-out wind speed, the electromagnetic clutch transmits the power between the first generator and the second parallel-stage gear transmission mechanism. At this time, the first generator and the second generator generate electricity simultaneously, and the first generator and the second generator reach the maximum power generation. The motor no longer supplements power to the large impeller and the small impeller.

[0017] When the wind speed is higher than the cut-out wind speed, the electromagnetic clutch transmits power between the first generator and the second parallel-stage gear transmission mechanism, and the first generator and the second generator generate electricity simultaneously. At the same time, the blade pitch angle control system controls the blade steering to reduce the blade speed and prevent the blade from being damaged due to excessive speed.

[0018] The first planetary gear transmission internal gear ring, the second planetary gear transmission internal gear ring, the third planetary gear transmission internal gear ring, and the fourth planetary gear transmission internal gear ring in the first planetary gear transmission mechanism are fixed between the front and rear housings by bolts, the second planetary gear transmission sun gear in the first planetary gear transmission mechanism is closely connected to the first large gear, the fourth planetary gear transmission sun gear in the second planetary gear transmission mechanism is closely connected to the second large gear, the first pinion and the second pinion are closely connected to the first generator and the second generator input shaft respectively, and the third pinion and the fourth pinion are closely connected to the electromagnetic clutch and the motor respectively.

[0019] The speed increasing ratio of the first planetary gear transmission mechanism and the second planetary gear transmission mechanism is between 1 / 20-1 / 100, the power of the first generator and the second generator is between 5 MW-20 MW, and the power of the motor is between 5KW-1 MW;

[0020] The transmission chain structure adopts four-point support, which is formed by two main shaft bearings and torque arms on both sides of the gearbox;

[0021] The electromagnetic clutch comprises an armature, a friction plate, an electromagnetic coil, a clutch input shaft and a clutch output shaft;

[0022] The tower is installed on the ground or on an offshore floating platform.

[0023] A control method for an ultra-compact integrated dual-wind-rotor wind turbine transmission chain structure comprises the following steps:

[0024] The large impeller and the small impeller are respectively connected to the first planetary gear transmission planetary frame in the first planetary gear transmission mechanism and the third planetary gear transmission planetary frame in the second planetary gear transmission mechanism. The wind drives the large impeller and the small impeller on both sides to rotate. The power is input by the first planetary gear transmission planetary frame and the third planetary gear transmission planetary frame, and is output by the second planetary gear transmission sun gear and the fourth planetary gear transmission sun gear after the speed is increased by the first planetary gear transmission mechanism and the second planetary gear transmission mechanism; the first large gear in the first parallel gear transmission mechanism is externally meshed with the first small gear and the second small gear, and the second large gear in the second parallel gear transmission mechanism is externally meshed with the third small gear and the fourth small gear; the power input by the large impeller and the small impeller is split at the first small gear, the second small gear, the third small gear and the fourth small gear, and then merged at the first generator and the second generator;

[0025] Wind turbines need to obtain wind energy to the maximum extent, but the direction of wind may change at any time. The first planetary gear transmission mechanism, the first parallel gear transmission mechanism, the first generator, the second generator, the electromagnetic clutch, the motor, the second parallel gear transmission mechanism, and the second planetary gear transmission mechanism are installed on the yaw system. When the wind speed and wind direction change, the speed sensor on the top of the tower sends the wind speed and wind direction signals to the electronic controller, and the electronic controller sends a signal to the yaw system to rotate the yaw motor so that the large impeller and the small impeller always face the wind direction;

[0026] When the wind speed is lower than the cut-in wind speed, the blade pitch angle control system controls the blade turning, reduces the blade angle of attack, increases the rotational torque to increase the blade speed, and expands the cut-in wind speed range;

[0027] When the wind speed is higher than the cut-out wind speed, the blade pitch angle control system controls the blade turning, increases the blade angle of attack and reduces the rotational torque to reduce the blade speed, preventing the blade from being damaged by too fast rotation speed, thereby achieving the purpose of protecting the wind power generation equipment.

[0028] The present invention has the following beneficial effects:

[0029] 1. The new wind turbine transmission chain adopted in the present invention can shorten the transmission distance of the dual-rotor wind turbine transmission chain, realize reliable, safe, efficient and stable operation of the transmission chain, expand the wind speed range of effective power generation of the wind turbine, and improve the wind energy capture efficiency and power generation of the dual-rotor wind turbine.

[0030] 2. In the present invention, the electromagnetic clutch controls the power transmission between the first generator and the parallel-stage gear transmission to adapt to different wind conditions. At low wind speeds, the motor provides additional power to the impeller for rotation, thereby expanding the wind speed range for effective power generation of the wind turbine and improving the wind energy capture efficiency and power generation of the dual-rotor wind turbine.

[0031] 3. The first planetary gear transmission mechanism can be used to transmit the power of the large impeller, and then the first planetary gear transmission mechanism is driven by the large impeller.

[0032] 4. The second planetary gear transmission mechanism can be used to transmit the power of the impeller.

[0033] 5. The first parallel-stage gear transmission mechanism can be used to drive the first generator and the second generator simultaneously, thereby achieving parallel power output.

[0034] 6. Power generation can be achieved through the first generator and the second generator. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0036] Figure 1 This is a simplified diagram of the transmission chain structure of the double-rotor wind turbine of the present invention.

[0037] Figure 2 This is a diagram showing the internal structure of the transmission chain of the dual-rotor wind turbine of the present invention.

[0038] In the figure: 1a-large impeller, 1b-small impeller;

[0039] 2-first planetary gear transmission mechanism, 2a-first planetary gear transmission sun gear, 2b-first planetary gear transmission planetary gear, 2c-first planetary gear transmission planetary carrier, 2d-first planetary gear transmission inner ring gear, 2e-second planetary gear transmission sun gear, 2f-second planetary gear transmission planetary gear, 2g-second planetary gear transmission planetary carrier, 2h-second planetary gear transmission inner ring gear;

[0040] 3-first parallel gear transmission mechanism, 3a-first large gear, 3b-first small gear, 3c-second small gear;

[0041] 4-first generator, 4a-first generator rotor, 4b-first generator stator, 4c-first output coil, 4d-first front end cover, 4e-first rear end cover, 4f-first generator bearing;

[0042] 5-second generator, 5a-second generator rotor, 5b-second generator stator, 5c-second output coil, 5d-second front end cover, 5e-second rear end cover, 5f-second generator bearing;

[0043] 6-electromagnetic clutch, 6a-armature, 6b-friction plate, 6c-electromagnetic coil, 6d-clutch input shaft, 6e-clutch output shaft;

[0044] 7-motor, 7a-stator core, 7b-motor rotor, 7c-excitation coil, 7d-end cover, 7e-machine base;

[0045] 8-second parallel gear transmission mechanism, 8a-second large gear, 8b-third small gear, 8c-fourth small gear;

[0046] 9-second planetary gear transmission mechanism, 9a-third planetary gear transmission sun gear, 9b-third planetary gear transmission planetary gear, 9c-third planetary gear transmission planetary carrier, 9d-third planetary gear transmission inner ring gear, 9e-fourth planetary gear transmission sun gear, 9f-fourth planetary gear transmission planetary gear, 9g-fourth planetary gear transmission planetary carrier, 9h-fourth planetary gear transmission inner ring gear;

[0047] 10-main shaft bearing, 11-yaw system, 12-tower. DETAILED DESCRIPTION

[0048] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0049] Embodiment 1:

[0050] See also Figure 1-2, an ultra-compact integrated dual-rotor wind turbine transmission chain structure, which includes a tower 12, a yaw system 11 is installed on the top of the tower 12, a first planetary gear transmission mechanism 2 is arranged on one side of the top of the yaw system 11, the first planetary gear transmission mechanism 2 is connected to the large impeller 1a, the first planetary gear transmission mechanism 2 is connected to the first parallel gear transmission mechanism 3; the first parallel gear transmission mechanism 3 is connected to the first generator 4 and the second generator 5; a second planetary gear transmission mechanism 9 is arranged on the other side of the top of the yaw system 11, the second planetary gear transmission mechanism 9 is connected to the small impeller 1b, the second planetary gear transmission mechanism 9 is connected to the second parallel gear transmission mechanism 8, the second parallel gear transmission mechanism 8 is connected to the first generator 4 through an electromagnetic clutch 6, and the second parallel gear transmission mechanism 8 is connected to the motor 7 at the same time. This new wind turbine drive chain structure can shorten the transmission distance of the dual-rotor wind turbine drive chain, achieve reliable, safe, efficient and stable operation of the drive chain, expand the wind speed range for effective power generation of the wind turbine, and improve the wind energy capture efficiency and power generation of the dual-rotor wind turbine.

[0051] Further, the first planetary gear transmission mechanism 2 includes a first planetary gear transmission sun gear 2a, a first planetary gear transmission planetary gear 2b, a first planetary gear transmission planetary carrier 2c, a first planetary gear transmission inner ring 2d, a second planetary gear transmission sun gear 2e, a second planetary gear transmission planetary gear 2f, a second planetary gear transmission planetary carrier 2g and a second planetary gear transmission inner ring 2h; the large impeller 1a is connected to the first planetary gear transmission planetary carrier 2c, and the second planetary gear transmission sun gear 2e is connected to the first large gear 3a of the first parallel-stage gear transmission mechanism 3, and power is input from the first planetary gear transmission planetary carrier 2c and output from the second planetary gear transmission sun gear 2e. The first planetary gear transmission mechanism 2 can be used to transmit the power of the large impeller 1a, and then drive the first planetary gear transmission mechanism 2 through the large impeller 1a. During the working process, the large impeller 1a drives the corresponding main shaft, and the main shaft drives the first planetary gear transmission planetary carrier 2c, and the first planetary gear transmission planetary wheel 2b is driven by the first planetary gear transmission planetary carrier 2c, and the first planetary gear transmission sun wheel 2a is synchronously driven by the first planetary gear transmission planetary wheel 2b, and the second planetary gear transmission planetary carrier 2g is driven by the first planetary gear transmission sun wheel 2a, and the second planetary gear transmission planetary wheel 2f is driven by the second planetary gear transmission planetary carrier 2g, and the second planetary gear transmission sun wheel 2e is driven by the second planetary gear transmission planetary wheel 2f, and the first parallel-stage gear transmission mechanism 3 is driven by the second planetary gear transmission sun wheel 2e.

[0052] Further, the second planetary gear transmission mechanism 9 includes a third planetary gear transmission sun gear 9a, a third planetary gear transmission planetary gear 9b, a third planetary gear transmission planetary carrier 9c, a third planetary gear transmission inner ring 9d, a fourth planetary gear transmission sun gear 9e, a fourth planetary gear transmission planetary gear 9f, a fourth planetary gear transmission planetary carrier 9g and a fourth planetary gear transmission inner ring 9h; the small impeller 1b is connected to the third planetary gear transmission planetary carrier 9c, the fourth planetary gear transmission sun gear 9e is connected to the second large gear 8a of the second parallel gear transmission mechanism 8, the power is input from the third planetary gear transmission planetary carrier 9c, and output from the fourth planetary gear transmission sun gear 9e. The second planetary gear transmission mechanism 9 can be used to transmit the power of the small impeller 1b. During the specific working process, the third planetary gear transmission planet carrier 9c is driven by the small impeller 1b, the third planetary gear transmission sun gear 9a is driven by the third planetary gear transmission planet carrier 9c, the third planetary gear transmission planet gear 9b is driven by the third planetary gear transmission sun gear 9a, the third planetary gear transmission sun gear 9a is driven by the third planetary gear transmission planet gear 9b, the third planetary gear transmission sun gear 9a is driven by the third planetary gear transmission planet gear 9b, the fourth planetary gear transmission planet carrier 9g is driven by the fourth planetary gear transmission planet carrier 9g, and the second parallel-stage gear transmission mechanism 8 is driven by the fourth planetary gear transmission sun gear 9e.

[0053] Furthermore, the first parallel-stage gear transmission mechanism 3 includes a first large gear 3a, a first small gear 3b and a second small gear 3c; the first large gear 3a is externally meshed with the first small gear 3b and the second small gear 3c; the first small gear 3b and the second small gear 3c are connected to an input shaft at one end of the first generator 4. The first parallel-stage gear transmission mechanism 3 can be used to simultaneously drive the first generator 4 and the second generator 5, and then used for parallel output of power.

[0054] Furthermore, the second parallel gear transmission mechanism 8 includes a second large gear 8a, a third small gear 8b and a fourth small gear 8c; the second large gear 8a externally meshes with the third small gear 8b and the fourth small gear 8c; the third small gear 8b and the fourth small gear 8c are connected to an input shaft at one end of the second generator 5. The second parallel gear transmission mechanism 8 can be used for parallel output of power. During operation, the third small gear 8b and the fourth small gear 8c can be synchronously driven by the second large gear 8a.

[0055] Furthermore, the first generator 4 includes a first generator rotor 4a, a first generator stator 4b, a first output coil 4c, a first front cover 4d, a first rear cover 4e and a first generator bearing 4f; the other end of the first generator 4 is connected to an electromagnetic clutch 6; the second generator 5 includes a second generator rotor 5a, a second generator stator 5b, a second output coil 5c, a second front cover 5d, a second rear cover 5e and a second generator bearing 5f; the other end of the second generator 5 is connected to an electric motor 7. The first generator 4 and the second generator 5 can generate electricity.

[0056] Furthermore, the electromagnetic clutch 6 is used to connect or disconnect the power between the first generator 4 and the second parallel-stage gear transmission mechanism 8 to adapt to different wind conditions:

[0057] When the wind speed is lower than the cut-in wind speed, the electromagnetic clutch 6 disconnects the power transmission between the first generator 4 and the second parallel-stage gear transmission mechanism 8, and the motor 7 provides power to the large impeller 1a and the small impeller 1b, thereby additionally supplementing the power required for the rotation of the large impeller 1a and the small impeller 1b;

[0058] When the wind speed is higher than the cut-in wind speed but lower than the rated wind speed, the electromagnetic clutch 6 transmits the power between the first generator 4 and the second parallel-stage gear transmission mechanism 8. At this time, the first generator 4 and the second generator 5 generate electricity simultaneously, and the motor 7 supplements the power required for the rotation of the large impeller 1a and the small impeller 1b.

[0059] When the wind speed is higher than the rated wind speed but lower than the cut-out wind speed, the electromagnetic clutch 6 transmits the power between the first generator 4 and the second parallel-stage gear transmission mechanism 8. At this time, the first generator 4 and the second generator 5 generate electricity simultaneously, and the first generator 4 and the second generator 5 reach the maximum power generation. The motor 7 no longer supplements power to the large impeller 1a and the small impeller 1b.

[0060] When the wind speed is higher than the cut-out wind speed, the electromagnetic clutch 6 transmits power between the first generator 4 and the second parallel-stage gear transmission mechanism 8, and the first generator 4 and the second generator 5 generate electricity simultaneously. At the same time, the blade pitch angle control system controls the blade steering to reduce the blade rotation speed to prevent the blade from being damaged due to excessive rotation speed.

[0061] Furthermore, the first planetary gear transmission internal gear ring 2d, the second planetary gear transmission internal gear ring 2h in the first planetary gear transmission mechanism 2 and the third planetary gear transmission internal gear ring 9d, and the fourth planetary gear transmission internal gear ring 9h in the second planetary gear transmission mechanism 9 are fixed between the front and rear housings by bolts, the second planetary gear transmission sun gear 2e in the first planetary gear transmission mechanism 2 is closely connected to the first large gear 3a, the fourth planetary gear transmission sun gear 9e in the second planetary gear transmission mechanism 9 is closely connected to the second large gear 8a, the first pinion 3b and the second pinion 3c are closely connected to the input shafts of the first generator 4 and the second generator 5, respectively, and the third pinion 8b and the fourth pinion 8c are closely connected to the electromagnetic clutch 6 and the motor 7, respectively.

[0062] Furthermore, the speed increasing ratio of the first planetary gear transmission mechanism 2 and the second planetary gear transmission mechanism 9 is between 1 / 20-1 / 100, the power of the first generator 4 and the second generator 5 is between 5 MW-20 MW, and the power of the motor 7 is between 5 KW-1 MW.

[0063] Furthermore, the transmission chain structure adopts four-point support, which is formed by two main shaft bearings 10 and torque arms on both sides of the gear box. The main shaft bearings 10 are used to stably support the main shaft of the impeller, thereby ensuring smooth rotation of the main shaft.

[0064] Furthermore, the electromagnetic clutch 6 comprises an armature 6a, a friction plate 6b, an electromagnetic coil 6c, a clutch input shaft 6d and a clutch output shaft 6e. The electromagnetic clutch 6 can be used for output control of power transmission.

[0065] Furthermore, the tower 12 is installed on the ground or on an offshore floating platform. The tower 12 can be used to stably support the entire wind power generation device.

[0066] Embodiment 2:

[0067] A control method for an ultra-compact integrated dual-wind-rotor wind turbine transmission chain structure comprises the following steps:

[0068] The large impeller 1a and the small impeller 1b are respectively connected to the first planetary gear transmission planet carrier 2c in the first planetary gear transmission mechanism 2 and the third planetary gear transmission planet carrier 9c in the second planetary gear transmission mechanism 9. The wind drives the large impeller 1a and the small impeller 1b on both sides to rotate, and the power is input by the first planetary gear transmission planet carrier 2c and the third planetary gear transmission planet carrier 9c, and is output by the second planetary gear transmission sun gear 2e and the fourth planetary gear transmission sun gear 9e after the speed is increased by the first planetary gear transmission mechanism 2 and the second planetary gear transmission mechanism 9; the first large gear 3a in the first parallel-stage gear transmission mechanism 3 is externally meshed with the first small gear 3b and the second small gear 3c, and the second large gear 8a in the second parallel-stage gear transmission mechanism 8 is externally meshed with the third small gear 8b and the fourth small gear 8c; the power input by the large impeller 1a and the small impeller 1b is split at the first small gear 3b, the second small gear 3c and the third small gear 8b, the fourth small gear 8c, and then merged at the first generator 4 and the second generator 5;

[0069] The wind turbine generator needs to obtain wind energy to the maximum extent, but the direction of the wind may change at any time. The first planetary gear transmission mechanism 2, the first parallel gear transmission mechanism 3, the first generator 4, the second generator 5, the electromagnetic clutch 6, the motor 7, the second parallel gear transmission mechanism 8, and the second planetary gear transmission mechanism 9 are installed on the yaw system 11. When the wind speed and wind direction change, the speed sensor on the top of the tower 12 sends the wind speed and wind direction signals to the electronic controller, and the electronic controller sends a signal to the yaw system 11 to rotate the yaw motor, so that the large impeller 1a and the small impeller 1b are always facing the wind direction;

[0070] When the wind speed is lower than the cut-in wind speed, the blade pitch angle control system controls the blade turning, reduces the blade angle of attack, increases the rotational torque to increase the blade speed, and expands the cut-in wind speed range;

[0071] When the wind speed is higher than the cut-out wind speed, the blade pitch angle control system controls the blade turning, increases the blade angle of attack and reduces the rotational torque to reduce the blade speed, preventing the blade from being damaged by too fast rotation speed, thereby achieving the purpose of protecting the wind power generation equipment.

Claims

1. An ultra-compact integrated dual-wind-rotor wind turbine transmission chain structure, characterized in that: It comprises a tower (12), a yaw system (11) being installed at the top of the tower (12), a first planetary gear transmission mechanism (2) being arranged on one side of the top of the yaw system (11), the first planetary gear transmission mechanism (2) being transmission-connected to the large impeller (1a), the first planetary gear transmission mechanism (2) being transmission-connected to the first parallel-stage gear transmission mechanism (3); the first parallel-stage gear transmission mechanism (3) being transmission-connected to the first generator (4) and the second generator (5); a second planetary gear transmission mechanism (9) being arranged on the other side of the top of the yaw system (11), the second planetary gear transmission mechanism (9) being transmission-connected to the small impeller (1b), the second planetary gear transmission mechanism (9) being transmission-connected to the second parallel-stage gear transmission mechanism (8), the second parallel-stage gear transmission mechanism (8) being connected to the first generator (4) via an electromagnetic clutch (6), and the second parallel-stage gear transmission mechanism (8) being simultaneously connected to the motor (7); The first planetary gear transmission mechanism (2) comprises a first planetary gear transmission sun gear (2a), a first planetary gear transmission planetary gear (2b), a first planetary gear transmission planetary carrier (2c), a first planetary gear transmission inner ring gear (2d), a second planetary gear transmission sun gear (2e), a second planetary gear transmission planetary gear (2f), a second planetary gear transmission planetary carrier (2g) and a second planetary gear transmission inner ring gear (2h); the large impeller (1a) is connected to the first planetary gear transmission planetary carrier (2c), the second planetary gear transmission sun gear (2e) is connected to the first large gear (3a) of the first parallel-stage gear transmission mechanism (3), and power is input from the first planetary gear transmission planetary carrier (2c) and output from the second planetary gear transmission sun gear (2e); The second planetary gear transmission mechanism (9) comprises a third planetary gear transmission sun gear (9a), a third planetary gear transmission planetary gear (9b), a third planetary gear transmission planetary carrier (9c), a third planetary gear transmission inner ring gear (9d), a fourth planetary gear transmission sun gear (9e), a fourth planetary gear transmission planetary gear (9f), a fourth planetary gear transmission planetary carrier (9g) and a fourth planetary gear transmission inner ring gear (9h); the small impeller (1b) is connected to the third planetary gear transmission planetary carrier (9c), the fourth planetary gear transmission sun gear (9e) is connected to the second large gear (8a) of the second parallel-stage gear transmission mechanism (8), and power is input from the third planetary gear transmission planetary carrier (9c) and output from the fourth planetary gear transmission sun gear (9e); The first parallel-stage gear transmission mechanism (3) comprises a first large gear (3a), a first small gear (3b) and a second small gear (3c); the first large gear (3a) externally meshes with the first small gear (3b) and the second small gear (3c); the first small gear (3b) is connected to an input shaft at one end of the first generator (4), and the second small gear (3c) is connected to an input shaft at one end of the second generator (5); The second parallel-stage gear transmission mechanism (8) comprises a second large gear (8a), a third small gear (8b) and a fourth small gear (8c); the second large gear (8a) is externally meshed with the third small gear (8b) and the fourth small gear (8c); the third small gear (8b) and the fourth small gear (8c) are closely connected to the electromagnetic clutch (6) and the motor (7), respectively; The first generator (4) comprises a first generator rotor (4a), a first generator stator (4b), a first output coil (4c), a first front end cover (4d), a first rear end cover (4e) and a first generator bearing (4f); the other end of the first generator (4) is connected to an electromagnetic clutch (6); The second generator (5) comprises a second generator rotor (5a), a second generator stator (5b), a second output coil (5c), a second front end cover (5d), a second rear end cover (5e) and a second generator bearing (5f); the other end of the second generator (5) is connected to the electric motor (7).

2. The ultra-compact integrated dual-wind-rotor wind turbine transmission chain structure according to claim 1, characterized in that: The electromagnetic clutch (6) is used to connect or disconnect the power between the first generator (4) and the second parallel-stage gear transmission mechanism (8) to adapt to different wind conditions; When the wind speed is lower than the cut-in wind speed, the electromagnetic clutch (6) disconnects the power transmission between the first generator (4) and the second parallel-stage gear transmission mechanism (8), and the electric motor (7) provides power to the large impeller (1a) and the small impeller (1b), thereby additionally supplementing the power required for the rotation of the large impeller (1a) and the small impeller (1b); When the wind speed is higher than the cut-in wind speed but lower than the rated wind speed, the electromagnetic clutch (6) transmits power between the first generator (4) and the second parallel-stage gear transmission mechanism (8), and at this time the first generator (4) and the second generator (5) generate power simultaneously, and the electric motor (7) supplements the power required for rotation of the large impeller (1a) and the small impeller (1b); When the wind speed is higher than the rated wind speed but lower than the cut-out wind speed, the electromagnetic clutch (6) transmits power between the first generator (4) and the second parallel-stage gear transmission mechanism (8), and at this time the first generator (4) and the second generator (5) generate power simultaneously, the first generator (4) and the second generator (5) reach maximum power generation, and the electric motor (7) no longer supplements power to the large impeller (1a) and the small impeller (1b); When the wind speed is higher than the cut-out wind speed, the electromagnetic clutch (6) transmits power between the first generator (4) and the second parallel-stage gear transmission mechanism (8), and the first generator (4) and the second generator (5) generate electricity simultaneously. At the same time, the blade pitch angle control system controls the blade turning to reduce the blade rotation speed and prevent the blade from being damaged due to excessive rotation speed.

3. The ultra-compact integrated dual-wind-rotor wind turbine transmission chain structure according to claim 2, characterized in that: The first planetary gear transmission inner gear ring (2d), the second planetary gear transmission inner gear ring (2h) in the first planetary gear transmission mechanism (2) and the third planetary gear transmission inner gear ring (9d), the fourth planetary gear transmission inner gear ring (9h) in the second planetary gear transmission mechanism (9) are fixed between the front and rear housings by bolts; the second planetary gear transmission sun gear (2e) in the first planetary gear transmission mechanism (2) is tightly connected to the first large gear (3a); the fourth planetary gear transmission sun gear (9e) in the second planetary gear transmission mechanism (9) is tightly connected to the second large gear (8a); the first pinion gear (3b) and the second pinion gear (3c) are tightly connected to the input shafts of the first generator (4) and the second generator (5), respectively; and the third pinion gear (8b) and the fourth pinion gear (8c) are tightly connected to the electromagnetic clutch (6) and the electric motor (7), respectively.

4. The ultra-compact integrated dual-wind-rotor wind turbine transmission chain structure according to claim 3, characterized in that: The speed increasing ratio of the first planetary gear transmission mechanism (2) and the second planetary gear transmission mechanism (9) is between 1 / 20 and 1 / 100, the power of the first generator (4) and the second generator (5) is between 5 MW and 20 MW, and the power of the electric motor (7) is between 5 kW and 1 MW; The transmission chain structure adopts four-point support, and the four-point support type is formed by two main shaft bearings (10) and torque arms on both sides of the gear box; The electromagnetic clutch (6) comprises an armature (6a), a friction plate (6b), an electromagnetic coil (6c), a clutch input shaft (6d) and a clutch output shaft (6e); The tower (12) is installed on the ground or on an offshore floating platform.

5. The control method of the ultra-compact integrated dual-wind-rotor wind turbine transmission chain structure according to claim 4, characterized in that: The following steps are involved: The large impeller (1a) and the small impeller (1b) are respectively connected to the first planetary gear transmission planetary frame (2c) in the first planetary gear transmission mechanism (2) and the third planetary gear transmission planetary frame (9c) in the second planetary gear transmission mechanism (9). Wind drives the large impeller (1a) and the small impeller (1b) on both sides to rotate. Power is input from the first planetary gear transmission planetary frame (2c) and the third planetary gear transmission planetary frame (9c). After the speed is increased by the first planetary gear transmission mechanism (2) and the second planetary gear transmission mechanism (9), the power is transmitted to the second planetary gear transmission sun gear (2e) and the fourth planetary gear transmission sun gear (2e). The planetary gear drives the sun gear (9e) to output; the first large gear (3a) in the first parallel gear transmission mechanism (3) is externally meshed with the first small gear (3b) and the second small gear (3c), and the second large gear (8a) in the second parallel gear transmission mechanism (8) is externally meshed with the third small gear (8b) and the fourth small gear (8c); the power input from the large impeller (1a) and the small impeller (1b) is split at the first small gear (3b), the second small gear (3c) and the third small gear (8b), and the fourth small gear (8c), and then merged at the first generator (4) and the second generator (5); The wind turbine generator needs to obtain wind energy to the maximum extent possible, but the direction of the wind may change at any time. The first planetary gear transmission mechanism (2), the first parallel gear transmission mechanism (3), the first generator (4), the second generator (5), the electromagnetic clutch (6), the motor (7), the second parallel gear transmission mechanism (8), and the second planetary gear transmission mechanism (9) are installed on the yaw system (11). When the wind speed and wind direction change, the speed sensor on the top of the tower (12) sends wind speed and wind direction signals to the electronic controller, and the electronic controller sends a signal to the yaw system (11) to rotate the yaw motor, so that the large impeller (1a) and the small impeller (1b) are always facing the wind direction. When the wind speed is lower than the cut-in wind speed, the blade pitch angle control system controls the blade turning, reduces the blade angle of attack, increases the rotational torque to increase the blade speed, and expands the cut-in wind speed range; When the wind speed is higher than the cut-out wind speed, the blade pitch angle control system controls the blade turning, increases the blade angle of attack and reduces the rotational torque to reduce the blade speed, preventing the blade from being damaged by too fast rotation speed, thereby achieving the purpose of protecting the wind power generation equipment.

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