Method for manufacturing a wind turbine system and wind turbine system

Abstract

The present invention relates to a manufacturing method for a wind power generator system and a wind power generator system. A manufacturing method for a wind power generator system is provided. The manufacturing method comprises: preparing a variable drive axle comprising a drive motor generator and intended for use in a hybrid electric vehicle; and assembling a blade to a rotating shaft coupled to the drive motor generator in the prepared variable drive axle.

Description

Technical Field

[0001] This disclosure relates to a method for manufacturing a wind turbine generator system and a wind turbine generator system. Background Technology

[0002] Japanese Unexamined Patent Application Publication No. 2003-336571 (JP 2003-336571 A) describes a wind turbine system that includes an electric generator, a transmission, a rotating shaft, etc. Summary of the Invention

[0003] Starting from the concept of a recycling society, it is conceivable to apply components from fields other than wind power generation to wind turbine systems. For example, the transmission drive axle components of hybrid electric vehicles include motors, gearboxes, and rotating shafts, and using these components in wind turbine systems leads to the efficient use of resources. This disclosure provides a technology for facilitating such a scheme to achieve a sustainable society.

[0004] A first aspect of this disclosure provides a method for manufacturing a wind turbine system. The method includes fabricating a variable-speed drive axle, which includes a drive electric generator and is intended for use in a hybrid electric vehicle. The method further includes assembling blades to a rotating shaft that is coupled to the drive electric generator in the fabricated variable-speed drive axle.

[0005] Using the manufacturing methods described above, the transmission drive axle installed in hybrid electric vehicles can be used as part of a wind turbine system. Because the transmission drive axle is a mass-produced vehicle component, it is significantly cheaper than components used in wind power generation. This allows for the provision of wind turbine systems at low cost, thereby promoting the further adoption of renewable energy.

[0006] In this manufacturing method, the rotating shaft of the transmission drive axle can be the axle that is connected to the wheels of the hybrid electric vehicle when the transmission drive axle is installed on the hybrid electric vehicle.

[0007] In this manufacturing method, the variable speed drive axle may include a planetary gear system, and the rotating shaft may be connected to a drive electric generator via the planetary gear system.

[0008] In this manufacturing method, the variable speed drive axle may include an electric generator for generating electricity, and the rotating shaft may also be connected to the electric generator for generating electricity via a planetary gear system.

[0009] In this manufacturing method, the planetary gear system may include a sun gear connected to an electric generator for power generation, and a ring gear connected to an electric generator for drive and blades.

[0010] A second aspect of this disclosure provides a wind turbine system. The wind turbine system includes blades, a first electric generator, a second electric generator, and a planetary gear system including a sun gear, a ring gear, and a planetary carrier. The first electric generator is coupled to the sun gear. The blades and the second electric generator are coupled to the ring gear.

[0011] Using the above wind turbine system, the driving torque input from the blades can be distributed between the first and second electric generators via a planetary gear system. Therefore, the overall power generation efficiency of the first and second electric generators can be optimized.

[0012] In the above wind turbine system, the ratio between the rotational speed of the second electric generator and the rotational speed of the blades can be fixed, while the ratio between the rotational speed of the first electric generator and the rotational speed of the blades can be adjustable.

[0013] The wind turbine system may further include a mechanical oil pump coupled to the planetary carrier, and the mechanical oil pump may be configured to supply oil to the components of the wind turbine system in response to the rotation of the planetary carrier.

[0014] In the above wind turbine system, the planetary gear train can be configured to change between a first state in which the ring gear rotates in the forward direction and the sun gear rotates in the reverse direction, and a second state in which the ring gear, planet carrier, and sun gear rotate in the forward direction. In the second state, the first electric generator can be configured to generate torque in the forward rotation direction.

[0015] The wind turbine system described above may further include a control unit configured to control the generating torque of a first electric generator and a second electric generator. The first electric generator may be an electric generator with a smaller starting torque compared to the second electric generator. The control unit may be configured to generate electricity by using the first electric generator when the input torque from the blade is less than a predetermined value, and the control unit may be configured to generate electricity by using the first electric generator and the second electric generator when the input torque is greater than the predetermined value.

[0016] The wind turbine system described above may further include: a control unit configured to control the generating torque of a first electric generator and a second electric generator; and a temperature sensor configured to measure the temperature of the first electric generator and the temperature of the second electric generator, and the control unit may be configured to reduce the generating torque as the temperature measured by the temperature sensor increases.

[0017] In the above wind turbine system, the wind turbine system can be a system for hybrid electric vehicles, the ring gear can be connected to the wheel, and the planetary carrier can be connected to the output shaft of the engine. Attached Figure Description

[0018] Features, advantages, and technical and industrial significance of exemplary embodiments of the invention will be described below with reference to the accompanying drawings, wherein similar symbols denote similar elements, and wherein:

[0019] Figure 1 It is a diagram that roughly shows the state of a hybrid electric vehicle's hybrid power unit being used as part of a wind turbine system;

[0020] Figure 2 It is a diagram that roughly shows the configuration of a hybrid electric vehicle on which a hybrid power unit is mounted;

[0021] Figure 3 It is a diagram that roughly shows the configuration of a wind turbine system in which a hybrid power unit is used;

[0022] Figure 4 This is an example of a nomogram showing the state of electricity being generated by a second electric generator;

[0023] Figure 5 This is an example of a nomogram showing the state of electricity being generated by the first and second electric generators;

[0024] Figure 6 This is an example of a nomogram in a planet-locked state; and

[0025] Figure 7 This is a graph showing an example of the power curve of a wind turbine system. Detailed Implementation

[0026] In one embodiment of this technology, the rotating shaft of the transmission drive axle can be an axle connected to the wheels of the hybrid electric vehicle when the transmission drive axle is mounted on it. With this configuration, electricity can be efficiently generated by the rotation of blades in a wind turbine system, as in the case of wheel-based power generation in a hybrid electric vehicle. As another embodiment, the rotating shaft of the transmission drive axle can be an engine shaft connected to the engine when the transmission drive axle is mounted on it in a hybrid electric vehicle.

[0027] In one embodiment of this technology, the variable speed drive axle may further include a planetary gear system. In this case, the rotating shaft of the variable speed drive axle may be connected to a drive electric generator via the planetary gear system.

[0028] In the embodiments described above, the variable speed drive axle may further include a generator for power generation. In this case, the rotating shaft of the variable speed drive axle may be connected to the generator via a planetary gear system. With this configuration, the wind turbine system can generate electricity using two generators. However, even when the variable speed drive axle includes two generators, the wind turbine system can generate electricity using only one of these generators.

[0029] In the embodiments described above, the planetary gear system may include a sun gear connected to a generator for power generation and a ring gear connected to a generator for drive and blades.

[0030] In one embodiment of this technology, the ratio between the rotational speed of the second electric generator and the rotational speed of the blades can be fixed. The ratio between the rotational speed of the first electric generator and the rotational speed of the blades can be adjustable. Using this configuration, the rotational speed of the first electric generator can be adjusted to a selected value, thereby increasing the energy conversion efficiency of the first electric generator.

[0031] In one embodiment of this technology, the wind turbine system may further include a mechanical oil pump coupled to the planetary carrier. The mechanical oil pump may be configured to supply oil to the components of the wind turbine system in response to the rotation of the planetary carrier. With this configuration, the components of the wind turbine system can be cooled and lubricated by the rotation of the planetary carrier.

[0032] In one embodiment of this technology, the planetary gear train can be configured to change states between a first state where the ring gear rotates in the forward direction and the sun gear rotates in the reverse direction, and a second state where the ring gear, planet carrier, and sun gear rotate in the forward direction. In the second state, a first electric generator can be configured to generate torque in the forward rotation direction. With this configuration, the first electric generator generates torque in the forward rotation direction, enabling a transition from the first state to the second state. In the second state, the planet carrier can rotate, allowing oil to be supplied using a mechanical oil pump.

[0033] In one embodiment of this technology, the wind turbine system may further include a control unit configured to control the generating torque of a first electric generator and a second electric generator. The first electric generator may have a smaller starting torque compared to the second electric generator. The control unit may be configured to generate electricity using the first electric generator when the input torque from the blades is less than a predetermined value. The control unit may also be configured to generate electricity using both the first and second electric generators when the input torque is greater than a predetermined value. This configuration enables both an increase in rated output power and a reduction in the cut-in wind speed for initiating power generation, thereby increasing power generation efficiency.

[0034] In one embodiment of this technology, the wind turbine system may further include a control unit configured to control the generating torque of a first electric generator and a second electric generator. The wind turbine system may further include a temperature sensor configured to measure the temperature of the first and second electric generators. The control unit may be configured to reduce the generating torque as the temperature measured by the temperature sensor increases. With this configuration, the temperatures of the first and second electric generators can be controlled, thereby increasing power generation efficiency and extending the lifespan of each of these electric generators.

[0035] In one embodiment of this technology, the wind turbine system can be a system for a hybrid electric vehicle. A ring gear can be coupled to the wheel. A planetary carrier can be coupled to the engine's output shaft. Using this configuration, a unit mounted on a hybrid electric vehicle can be used as part of a wind turbine system.

[0036] Configuration of Hybrid Electric Vehicle 2

[0037] First, the hybrid power unit 8 of the hybrid electric vehicle 2 will be described. (As in...) Figure 1 As shown, in the wind turbine system 50 of this embodiment, a hybrid power unit 8, which has been removed from the hybrid electric vehicle 2, is used. The hybrid power unit 8 is a power unit connected to the wheels 4 in the hybrid electric vehicle 2. The hybrid power unit 8 includes a transmission drive axle 6 and an electric control unit 7. The hybrid power unit 8 may be a new product.

[0038] As in Figure 2As shown, the transmission drive axle 6 further includes a second electric generator 14 and a planetary gear train 16. The planetary gear train 16 is located between the engine shaft 10a and the first electric generator 12. The engine shaft 10a is connected to the first electric generator 12 via the planetary gear train 16. The engine shaft 10a is also connected to the second electric generator 14 via the planetary gear train 16. The first electric generator 12 is an electric generator with a lower rated output power and a smaller starting torque compared to the second electric generator 14. In the figures, the first electric generator 12 may be referred to as MG1, and the second electric generator 14 may be referred to as MG2.

[0039] The planetary gear system 16 includes a sun gear 16s, multiple planetary gears 16p, a planet carrier 16c, and a ring gear 16u. The sun gear 16s is connected to a first electric generator 12. The planetary gears 16p are positioned around and mesh with the sun gear 16s. The planet carrier 16c supports the planetary gears 16p, allowing them to rotate. The planet carrier 16c is connected to an engine shaft 10a. The ring gear 16u is positioned around and meshes with the planetary gears 16p. The ring gear 16u is connected to a second electric generator 14 via a first reduction gear 18. The ring gear 16u is connected to the axle 4a of the wheel 4 via a second reduction gear 20. A differential gear 21 is disposed between the second reduction gear 20 and the axle 4a.

[0040] The transmission drive axle 6 further includes a mechanical oil pump 24. The mechanical oil pump 24 is coupled to the engine shaft 10a and is driven by the rotation of the engine shaft 10a. The mechanical oil pump 24 is driven by the rotation of the engine shaft 10a to circulate lubricating oil within the transmission drive axle 6. Therefore, oil can be supplied to each of the components of the transmission drive axle 6.

[0041] The power control unit 7 is combined with the variable speed drive axle 6. The power control unit 7 includes a first inverter 26, a second inverter 28, a DC-DC converter 30, and a control unit 31 for controlling these components. The control unit 31 can be a power control unit (PCU). The first inverter 26 is electrically connected to a first electric generator 12. The control unit 31 can control the generating torque of the first electric generator 12 via the first inverter 26. The second inverter 28 is electrically connected to a second electric generator 14. The control unit 31 can control the generating torque of the second electric generator 14 via the second inverter 28.

[0042] Temperature sensor 61 is configured for the first electric generator 12, and temperature sensor 62 is configured for the second electric generator 14. Temperature data entries output from temperature sensors 61 and 62 are input to control unit 31.

[0043] The DC-DC converter 30 is electrically connected to the first electric generator 12 via the first inverter 26 and to the second electric generator 14 via the second inverter 28. The battery 40 of the hybrid electric vehicle 2 is electrically connected to the DC-DC converter 30. The battery 40 has, for example, multiple lithium-ion cells and is configured to be rechargeable. In the hybrid electric vehicle 2, the DC-DC converter 30 can boost the DC power from the battery 40 and supply the DC power to the first inverter 26 and the second inverter 28. The first inverter 26 can convert the DC power from the DC-DC converter 30 into AC power and supply the AC power to the first electric generator 12. Therefore, the first electric generator 12 can operate using the power supplied from the battery 40, for example, to start the engine 10. Similarly, the second inverter 28 can convert the DC power from the DC-DC converter 30 into AC power and supply the AC power to the second electric generator 14. Therefore, the second electric generator 14 can operate using the power supplied from the battery 40, for example, to drive the wheels 4.

[0044] As described above, the first electric generator 12 is driven by the engine 10 to function as a generator. In this case, the first inverter 26 converts the AC power from the first electric generator 12 into DC power and supplies the DC power to the DC-DC converter 30. The DC-DC converter 30 then steps down the DC power from the first inverter 26 and supplies the DC power to the battery 40. On the other hand, the second electric generator 14 can also function as a generator to utilize regenerative braking in the hybrid electric vehicle 2. In this case, the second inverter 28 converts the AC power from the second electric generator 14 into DC power and supplies the DC power to the DC-DC converter 30. The DC-DC converter 30 then steps down the DC power from the second inverter 28 and supplies the DC power to the battery 40.

[0045] Configuration of Wind Turbine Generator System 50

[0046] Next, refer to Figure 1 and Figure 3 A wind turbine system 50 is described, in which a hybrid power unit 8 is used. In addition to the hybrid power unit 8, the wind turbine system 50 also includes blades 52 and a power conditioner 54. The power conditioner 54 is connected to a power control unit 7 and is positioned between the external power system 100 and the power control unit 7.

[0047] When manufacturing the wind turbine system 50, firstly, the hybrid power unit 8 is removed from the hybrid electric vehicle 2. Then, in the removed hybrid power unit 8, the blade 52 is assembled to the axle 4a of the transmission drive axle 6. Thus, a structure is completed in which the first electric generator 12 is connected to the sun gear 16s and the second electric generator 14 and blade 52 are connected to the ring gear 16u. No components are connected to the engine shaft 10a. In the above structure, the ratio between the rotational speed of the second electric generator 14 and the rotational speed of the blade 52 is fixed. On the other hand, the ratio between the rotational speed of the first electric generator 12 and the rotational speed of the blade 52 is adjustable.

[0048] The power regulator 54 is electrically connected to the power control unit 7. Power generated by the first electric generator 12 and the second electric generator 14 is supplied to the power regulator 54 via the power control unit 7. The power regulator 54 is coordinated with the external power system 100 to enable the supply of generated power to the external power system 100. Alternatively, or in addition to the power regulator 54, a power storage device may be connected to the power control unit 7. If necessary, a reduction gear, a speed-increasing gear, or a transmission may be provided between the blade 52 and the axle 4a.

[0049] Operation of wind turbine generator system 50

[0050] Reference Figures 4 to 6 The nomograms describe the operation of the wind turbine system 50. Each nomogram shows the relationship between the rotational speed of the sun gear Ng, the rotational speed of the planet carrier Ne, and the rotational speed of the ring gear Nm.

[0051] Figure 4 An example nomogram showing the state of electricity being generated by the second electric generator 14 is shown. When the rotation of the blade 52 is input to the axle 4a, the ring gear 16u rotates in the forward direction at a ring gear rotational speed Nm. The rotation of the ring gear 16u is transmitted to the second electric generator 14. The control unit 31 controls the second inverter 28 to apply the generating torque to the second electric generator 14. Therefore, electricity can be generated by the second electric generator 14. The sun gear 16s rotates in the reverse direction at a sun gear rotational speed Ng, so that the first electric generator 12 rotates in the reverse direction when unloaded. The planet carrier rotational speed Ne of the planet carrier 16c is zero. In other words, the engine shaft 10a is in a pseudo-locked state (see area R1).

[0052] Figure 5 An example nomogram showing the state of electricity being generated by the first electric generator 12 and the second electric generator 14. Figure 4In the power generation state, the first electric generator 12 generates torque in the forward rotation direction. Specifically, the first inverter 26 is controlled to apply the generating torque to the first electric generator 12. In order to generate torque in the forward rotation direction in the first electric generator 12 which rotates in the reverse direction, the first electric generator 12 operates as a generator. Torque in the direction that causes the engine shaft 10a to rotate in the forward direction is generated in the sun gear 16s. Therefore, the planetary carrier rotation speed Ne increases (see region R2). The share of power generated between the first electric generator 12 and the second electric generator 14 can be controlled by the generating torque applied to both the first electric generator 12 and the second electric generator 14 respectively by the control unit 31.

[0053] Figure 6 An example of a nomogram showing a planetary locking state. Figure 4 In this state, the control unit 31 supplies power to the first electric generator 12 via the first inverter 26. Therefore, the first electric generator 12 rotates in the positive direction (see region R3), and the planet carrier rotational speed Ne further increases (see region R4). Then, as the planet carrier rotational speed Ne increases until the sun gear rotational speed Ng, the planet carrier rotational speed Ne, and the ring gear rotational speed Nm are as described above... Figure 6 The planetary gear system is locked when the values ​​shown in the diagram are equal to each other.

[0054] As described above, this allows the wind turbine system 50 to be changed to a state where the planetary carrier rotation speed Ne (i.e., the rotation speed of the engine shaft 10a) is zero. Figure 4 ) and the state where the planetary carrier rotation speed Ne is at its maximum ( Figure 6 The state of selection between ( ) and ( ). In other words, the control unit 31 controls the rotational speed of the first electric generator 12 so that the rotational speed Ne of the planetary carrier (i.e., the rotational speed of the engine shaft 10a) can be adjusted. As the rotational speed Ne of the planetary carrier increases, the flow rate of lubricating oil circulating from the mechanical oil pump 24 increases. Therefore, the rotational speed Ne of the planetary carrier can be adjusted as needed according to the cooling and lubrication conditions of the components of the wind turbine system 50.

[0055] Specific example 1 of the control of wind turbine generator system 50

[0056] Figure 7This is a graph illustrating an example of the power curve of the wind turbine system 50. In region A1, from the cut-in wind speed IS to the predetermined wind speed PS, the control unit 31 applies the generating torque only to the first electric generator 12. Therefore, electricity is generated using only the first electric generator 12. On the other hand, in region A2, from the predetermined wind speed PS to the cut-out wind speed OS, the control unit 31 applies the generating torque to each of the first electric generator 12 and the second electric generator 14. Therefore, electricity is generated by both the first electric generator 12 and the second electric generator 14. In other words, when the input torque from the blade 52 is less than the predetermined torque determined by the predetermined wind speed PS, electricity is generated by the first electric generator 12. On the other hand, when the input torque is greater than the predetermined torque, electricity is generated by both the first electric generator 12 and the second electric generator 14.

[0057] The first electric generator 12 has a smaller starting torque compared to the second electric generator 14. Therefore, by using only the first electric generator 12 in region A1, the cut-in wind speed IS decreases. Furthermore, by using both the first electric generator 12 and the second electric generator 14 in region A2, the rated output power RO increases. This increases power generation efficiency.

[0058] Specific example 2 of the control of wind turbine generator system 50

[0059] Control unit 31 monitors temperature data acquired from temperature sensors 61 and 62. Then, as the temperature of the first electric generator 12 rises to a predetermined temperature, the torque applied to the first electric generator 12 decreases. As the temperature of the second electric generator 14 rises to a predetermined temperature, the torque applied to the second electric generator 14 decreases. Therefore, the temperatures of the first electric generator 12 and the second electric generator 14 can be controlled to a predetermined temperature or lower, thereby increasing power generation efficiency and extending the service life of each of these electric generators.

[0060] When the temperature of at least one of the first electric generator 12 and the second electric generator 14 rises to a predetermined temperature, the control unit 31 generates a torque in the first electric generator 12 in the positive rotational direction. Therefore, the engine shaft 10a rotates to drive the mechanical oil pump 24, thereby cooling the first electric generator 12 and the second electric generator 14.

[0061] Beneficial effects

[0062] As described above, in the wind turbine system 50 of this embodiment, the hybrid power unit 8 for the hybrid electric vehicle 2 is used as part of the wind turbine system 50. Because the hybrid power unit 8 is a mass-produced vehicle component, it is much cheaper than components designed for wind power generation. The wind turbine system 50 can be provided at low cost, thereby promoting the further popularization of renewable energy. The hybrid power unit 8 is advantageous in terms of availability compared to components designed for wind power generation. Maintenance convenience is improved because the expertise accumulated in the vehicle can be used to maintain the hybrid power unit 8.

[0063] Using the wind turbine system 50 of this specification, the drive torque input from the blades 52 can be distributed between the first electric generator 12 and the second electric generator 14 via the planetary gear train 16. The rotational speed of the first electric generator 12 can be set independently of the rotational speed of the blades 52, making it possible to generate electricity at the optimal operating point of the first electric generator 12 and the second electric generator 14. The overall power generation efficiency of the wind turbine system 50 can be optimized. Even in the event of a failure of one of the first electric generator 12 and the second electric generator 14, the other can still generate electricity. Redundancy can be provided for failures.

[0064] The embodiments have been described in detail above; however, these are merely illustrative and not intended to limit the appended claims. The technology described in the appended claims also covers various variations and modifications to the specific examples illustrated above. The technical elements described in the specification or drawings present technical availability individually or in various combinations, and are not limited to the combination of the claims appended at the time of filing this application. The technology illustrated in the specification and drawings is capable of achieving multiple intentions simultaneously and is technically available by achieving one of these intentions.

[0065] Variant

[0066] The blade 52 is assembled to a shaft not limited to axle 4a. The blade 52 can be assembled to another rotating shaft connected to the first electric generator 12 or the second electric generator 14, such as the engine shaft 10a of the transmission drive axle 6.

[0067] The second electric generator 14 is an example of a drive electric generator. The first electric generator 12 is an example of a power generation electric generator. Figure 4 and Figure 5 The state is an example of the first state. Figure 6 The state is an example of the second state.

Claims

1. A method for manufacturing a wind turbine generator system, the method being characterized by comprising: The manufacture of a variable speed drive axle, the variable speed drive axle being intended for use in a hybrid electric vehicle, the variable speed drive axle comprising... Electric generator for power generation; Electric generator for driving; and A planetary gear system, comprising a sun gear, a ring gear, and a planet carrier, and The blades are assembled onto a rotating shaft, which is connected to the drive electric generator in the fabricated variable-speed drive axle. The sun gear is connected to the electric generator for power generation, and the ring gear is connected to the electric generator for drive and the blade; The wind turbine system further includes a mechanical oil pump coupled to the planetary carrier, wherein the mechanical oil pump is configured to supply oil to the components of the wind turbine system in response to the rotation of the planetary carrier. Specifically, the rotational speed of the electric generator used for power generation is controlled to adjust the rotational speed of the planetary carrier.

2. The manufacturing method according to claim 1, characterized in that, The rotating shaft of the transmission drive axle is the axle that is connected to the wheels of the hybrid electric vehicle when the transmission drive axle is installed on the hybrid electric vehicle.

3. The manufacturing method according to claim 2, characterized in that: The rotating shaft is connected to the drive electric generator via the planetary gear system.

4. The manufacturing method according to claim 3, characterized in that: The rotating shaft is also connected to the electric generator for power generation via the planetary gear system.

5. A wind turbine generator system, characterized in that... include: blade; First electric generator; Second electric generator; and A planetary gear system, comprising a sun gear, a ring gear, and a planet carrier, The first electric generator is connected to the sun gear; The blade and the second electric generator are connected to the gear ring; The wind turbine system further includes a mechanical oil pump coupled to the planetary carrier, wherein the mechanical oil pump is configured to supply oil to the components of the wind turbine system in response to the rotation of the planetary carrier. Specifically, the rotational speed of the first electric generator is controlled to adjust the rotational speed of the planetary carrier. The wind turbine system is used in hybrid electric vehicles. The gear ring is connected to the wheel; and The planetary carrier is connected to the engine's output shaft.

6. The wind turbine generator system according to claim 5, characterized in that: The ratio between the rotational speed of the second electric generator and the rotational speed of the blades is fixed; and The ratio between the rotational speed of the first electric generator and the rotational speed of the blades is adjustable.

7. The wind turbine generator system according to claim 5 or 6, characterized in that: The planetary gear system is configured to change states between a first state in which the ring gear rotates in the positive direction and the sun gear rotates in the negative direction, and a second state in which the ring gear, the planet carrier, and the sun gear rotate in the positive direction. and In the second state, the first electric generator is configured to generate torque in the positive rotational direction.

8. The wind turbine generator system according to claim 5 or 6, characterized in that... The system further includes a control unit configured to control the generating torque of the first electric generator and the generating torque of the second electric generator, wherein: The first electric generator is an electric generator with a smaller starting torque compared to the second electric generator; The control unit is configured to generate electricity by using the first electric generator when the input torque from the blade is less than a predetermined value; and The control unit is configured to generate electricity by using the first electric generator and the second electric generator when the input torque is greater than the predetermined value.

9. The wind turbine generator system according to claim 5 or 6, characterized in that... Further includes: A control unit configured to control the generating torque of the first electric generator and the generating torque of the second electric generator; and A temperature sensor, configured to measure the temperature of the first electric generator and the temperature of the second electric generator, wherein: The control unit is configured to reduce the generated torque as the temperature measured by the temperature sensor increases.

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