CN116335879A - Wind turbine generator speed regulating device, wind turbine generator and control method thereof - Google Patents

Wind turbine generator speed regulating device, wind turbine generator and control method thereof Download PDF

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Publication number
CN116335879A
CN116335879A CN202310160768.4A CN202310160768A CN116335879A CN 116335879 A CN116335879 A CN 116335879A CN 202310160768 A CN202310160768 A CN 202310160768A CN 116335879 A CN116335879 A CN 116335879A
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Prior art keywords
wheel
speed
feedback
speed regulating
wind turbine
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Inventor
孙永岗
康鹏举
蒋勇
倪黎
邹皓
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Shanghai Electric Wind Power Group Co Ltd
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Shanghai Electric Wind Power Group Co Ltd
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Priority to CN202310160768.4A priority Critical patent/CN116335879A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D7/00—Controlling wind motors 
    • F03D7/02—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor
    • F03D7/0276—Controlling wind motors  the wind motors having rotation axis substantially parallel to the air flow entering the rotor controlling rotor speed, e.g. variable speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03D—WIND MOTORS
    • F03D15/00—Transmission of mechanical power
    • F03D15/10—Transmission of mechanical power using gearing not limited to rotary motion, e.g. with oscillating or reciprocating members
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)

Abstract

The invention relates to the field of wind turbine generators, in particular to a wind turbine generator speed regulating device, a wind turbine generator and a control method thereof; the speed regulating device of the wind turbine comprises a differential gear speed regulating box and a speed regulating motor, wherein the differential gear speed regulating box comprises a differential gear train and a speed regulating motor train, and the differential gear train comprises a speed regulating gear ring, a first input shaft and an output shaft which are used for being connected with the wind turbine; the speed regulation gear ring is connected with the speed regulation motor gear train, and the speed regulation motor is externally connected with the speed regulation motor gear train; the differential gear speed regulating box further comprises a feedback gear train, the feedback gear train comprises a transmission gear set and a feedback clutch, the transmission gear set is respectively connected with the speed regulating gear ring and the output shaft, and the feedback clutch is arranged on the transmission gear set and used for controlling connection or disconnection of the transmission gear set. According to the wind turbine generator speed regulating device, the feedback gear train is additionally arranged, so that the transmitted torque is increased, and the speed regulating motor is driven to rotate for power generation.

Description

Wind turbine generator speed regulating device, wind turbine generator and control method thereof
Technical Field
The invention relates to the field of wind turbine generators, in particular to a wind turbine generator speed regulating device, a wind turbine generator and a control method thereof.
Background
The current wind power technology taking the front stepless speed regulation technology as the core adopts a constant-speed synchronous generator, so that the rotating speed of the synchronous generator is always kept near the synchronous rotating speed, and the frequency of current generated by the synchronous generator is stable, thereby directly connecting the synchronous generator with a power grid without arranging a converter.
The mode of regulating the rotational speed of the input synchronous generator using the differential gear is most efficient. The related art provides a speed regulating device of a wind turbine generator, which comprises a differential gear speed regulating box and a speed regulating motor. The wind wheel rotates under the action of wind force, the rotation of the wind wheel is input into the differential gear speed regulating box after being accelerated by the speed increasing gear box, and the speed regulating motor is connected with the differential gear speed regulating box and inputs the rotation into the differential gear speed regulating box. The rotation of the wind wheel after speed increasing and the rotation speed of the speed regulating motor are combined in the differential gear speed regulating box and output to the synchronous generator. When the external wind speed changes, the rotation speed of the wind wheel changes, and the rotation speed output to the synchronous generator can be kept constant by controlling the rotation speed of the speed regulating motor, so that the frequency of the current generated by the synchronous generator is stable.
The speed regulating motor is provided with an electric mode and a power generation mode; when the external wind speed is smaller than a certain value, the rotation after the wind wheel is accelerated is insufficient to enable the rotation speed of the synchronous generator to reach the set rotation speed of grid-connected power generation after being changed by the differential gear speed regulating box, the speed regulating motor is in an electric mode, and the speed regulating motor drives the gear train in the differential gear speed regulating box to rotate so as to drive the synchronous generator to rotate. When the external wind speed is greater than or equal to a certain value, the rotation speed of the synchronous generator exceeds the set rotation speed of grid-connected power generation only by means of the speed change of the differential gear speed regulating box after the wind wheel is accelerated, at the moment, the speed regulating motor is in a power generation mode, and a part of rotation provided by the wind wheel is output to the speed regulating motor through the differential gear speed regulating box to drive the speed regulating motor to generate power.
When the external wind speed is too small, the rotating speed input by the wind wheel is too small, and the synchronous generator reaches and maintains the rotating speed of stable grid-connected power generation, the speed regulating motor needs to be operated at a high speed in an electric mode, so that the speed regulating motor is not beneficial to selection and use, and meanwhile, the power generation efficiency is low; therefore, the existing wind turbine generator system often sets a cut-in wind speed, and wind power lower than the cut-in wind speed is rejected and is not applied to power generation. Therefore, the resource waste is caused, and the overall power generation efficiency of the wind turbine generator is reduced.
Disclosure of Invention
The invention aims to overcome the defect of low power generation efficiency of a wind turbine in the prior art, and provides a speed regulating device of the wind turbine, the wind turbine and a control method of the wind turbine.
The invention solves the technical problems by the following technical scheme:
in a first aspect, the invention provides a speed regulating device of a wind turbine, comprising a differential gear speed regulating box and a speed regulating motor, wherein the differential gear speed regulating box comprises a differential gear train and a speed regulating motor train, and the differential gear train comprises a speed regulating gear ring and a first input shaft and an output shaft which are used for being connected with the wind turbine; the speed regulation gear ring is connected with the speed regulation motor gear train, and the speed regulation motor is externally connected with the speed regulation motor gear train;
The differential gear speed regulating box further comprises a feedback gear train, the feedback gear train comprises a transmission gear set and a feedback clutch, the transmission gear set is respectively connected with the speed regulating gear ring and the output shaft, and the feedback clutch is arranged on the transmission gear set and used for controlling connection or disconnection of the transmission gear set.
In the scheme, the wind turbine generator speed regulating device is additionally provided with the feedback gear train, the torque of the output shaft of the differential gear train of the differential gear speed regulating box is transmitted to the speed regulating gear ring of the differential gear train, the speed regulating gear ring is connected with the speed regulating motor train, and the torque is transmitted to the speed regulating motor through the speed regulating gear ring and the speed regulating motor train, so that the torque transmitted to the speed regulating motor is increased, and even if the rotating speed of the wind turbine generator speed regulating device is very low, the transmitted torque can be increased to drive the speed regulating motor to rotate for generating electricity, so that the wind energy with low wind speed is fully utilized, and the generating efficiency of the wind turbine generator is improved; the feedback gear train comprises a transmission gear set and a feedback clutch, so that when the feedback gear train is required to transmit torque, the transmission gear set can be kept in engagement with the speed regulation gear ring and the output shaft by controlling the feedback clutch to be closed; when the feedback gear train is not needed to feed back the torque, the transmission gear set, the speed regulation gear ring and the output shaft can be disconnected by controlling the feedback clutch to be opened, so that the output shaft can output the torque for the synchronous generator to generate power.
Preferably, the speed regulating device of the wind turbine generator further comprises a controller, when the rotating speed of the output shaft is smaller than the set rotating speed, the controller controls the feedback clutch to be closed, and the controller controls the speed regulating motor to be in a power generation mode; when the rotating speed of the output shaft is larger than or equal to the set rotating speed, the controller controls the feedback clutch to be disconnected, and the controller controls the speed regulating motor to be in an electric mode.
In the scheme, when the rotating speed of the output shaft is smaller than the set rotating speed for the synchronous generator to generate electricity, the controller controls the feedback clutch to be closed, so that the feedback gear train is kept engaged with the output shaft and the speed regulation gear ring, thereby transmitting the torque of the output shaft to the speed regulation motor, and the controller controls the speed regulation motor to generate electricity in a power generation mode; when the external wind speed increases, so that the rotating speed of the output shaft is greater than or equal to the set rotating speed, the controller controls the feedback clutch to be opened, so that the connection between the feedback gear train and the output shaft and the speed regulation gear ring is disconnected, the torque of the output shaft can be transmitted to the outside and drives the synchronous generator of the wind turbine generator to generate power, the controller controls the speed regulation motor to provide rotation for the differential gear train in an electric mode, and the rotation of the speed regulation motor and the rotation of the external wind wheel input are combined into rotation with the set rotating speed through the differential gear train and are output through the output shaft to generate power.
Preferably, the differential gear train further comprises a planet wheel, a planet carrier and a sun wheel, wherein the planet wheel and the sun wheel are both positioned in the speed regulation gear ring, the input shaft is connected with the planet carrier, the sun wheel is fixedly arranged on the output shaft, the first input shaft is connected with the planet carrier, the planet wheel is rotatably arranged on the planet carrier and is simultaneously meshed with the inner teeth of the speed regulation gear ring and the sun wheel.
In the scheme, rotation brought by external wind power is input into the planet carrier through the input shaft to drive the planet carrier to rotate, and the planet gears are meshed with the speed-regulating gear ring and the sun gear, so that the rotation speed of the sun gear can be regulated through regulating the rotation speed of the speed-regulating gear ring by the speed-regulating motor, and the rotation speed of the sun gear can be kept at a set rotation speed when the output shaft outputs rotation power to the external.
Preferably, the transmission wheel set comprises a first feedback wheel, a steering wheel and a second feedback wheel, the first feedback wheel is connected with the output shaft, the second feedback wheel is meshed with the external teeth of the speed regulation gear ring, the steering wheel is meshed with the first feedback wheel, the steering wheel and the second feedback wheel are coaxially arranged on the same rotating shaft, and the steering wheel is connected with and disconnected from the second feedback wheel through the feedback clutch.
In the scheme, the torque of an output shaft is transmitted to a speed regulation gear ring through a first feedback wheel, a steering wheel and a second feedback wheel in sequence; the first feedback wheel turns opposite to the output shaft, the steering wheel turns opposite to the first feedback wheel, the second feedback wheel turns the same as the steering wheel, namely the second feedback wheel turns the same as the output shaft, so that the steering of the speed regulation gear ring is opposite to the steering of the output shaft and the sun wheel; when the speed regulating motor is in an electric mode, the rotation direction of the speed regulating gear ring is opposite to that of the sun theory, and the rotation of the speed regulating gear ring is beneficial to the rotation of the sun wheel; therefore, when the rotating speed of the output shaft is increased to the set rotating speed, the rotating direction of the speed regulating motor is consistent in the process of switching the speed regulating motor from the power generation mode to the electric mode, and the speed regulating motor is prevented from being excessively impacted due to rapid reversing.
Preferably, the feedback gear train further comprises a first dislocation wheel fixedly arranged on the output shaft, the first dislocation wheel is coaxial with the sun wheel and is arranged at intervals, and the first feedback wheel is meshed with the first dislocation wheel.
In the scheme, the dislocation wheel is fixedly arranged on the output shaft and coaxially and synchronously rotates with the sun wheel, and the first feedback wheel is meshed with the first dislocation wheel to realize transmission between the sun wheel and the feedback wheel train; therefore, the first feedback wheel and the sun wheel are not in the same plane, and interference between the first feedback wheel and the planet wheel or the planet carrier is avoided.
Preferably, the first feedback wheel is meshed with the sun wheel, the first feedback wheel is located on one side of the planet wheel away from the planet carrier, and the first feedback wheel and the planet wheel are located in different planes.
In the scheme, the planet wheel and the first feedback wheel are meshed with the sun wheel; the first feedback wheel and the planet wheel are positioned in different planes, so that interference between the first feedback wheel and the planet wheel is avoided.
Preferably, the transmission wheel set comprises a third feedback wheel and a second dislocation wheel, the third feedback wheel is meshed with the internal teeth of the speed regulation gear ring, the third feedback wheel and the planet wheel are positioned in different planes, and the second dislocation wheel is arranged on one side, far away from the planet wheel, of the third feedback wheel; the second dislocation wheel is connected to the output shaft, the second dislocation wheel and the third feedback wheel are coaxially arranged on the same rotating shaft, and the second dislocation wheel is connected with and disconnected from the third feedback wheel through the feedback clutch.
In the scheme, the torque of the output shaft is sequentially transmitted to the speed regulation gear ring through the second dislocation wheel and the third feedback wheel, and the connection and disconnection of the transmission paths of the output shaft, the second dislocation wheel, the third feedback wheel and the speed regulation gear ring are realized by controlling the feedback clutch to be closed or opened; the second dislocation wheel is opposite to the rotation direction of the output shaft, the second dislocation wheel is the same as the rotation direction of the third feedback wheel, the third feedback wheel is meshed with the internal teeth of the speed regulation gear ring, so that the rotation direction of the third feedback wheel is the same as the rotation direction of the speed regulation gear ring, and the rotation direction of the speed regulation gear ring is opposite to the rotation direction of the output shaft; meanwhile, the third feedback wheel is not directly connected with the output shaft due to the arrangement of the second dislocation wheel, so that transmission connection disconnection between the output shaft and the speed regulation gear ring can be ensured when a feedback gear train is not needed for torque transmission. The thickness of the speed regulation gear ring is larger to simultaneously engage the third feedback wheel and the planet wheel, and the third feedback wheel and the planet wheel are not in the same plane, so that interference between the third feedback wheel and the planet wheel is avoided.
Preferably, the feedback gear train further comprises a third dislocation wheel fixedly arranged on the same rotating shaft with the sun wheel, the third dislocation wheel is coaxial with the sun wheel and is arranged at intervals, and the second dislocation wheel is meshed with the third dislocation wheel.
In the scheme, the third dislocation wheel and the sun wheel are coaxially arranged at intervals, the second dislocation wheel is meshed with the third dislocation wheel to realize the joint of the second dislocation wheel and the output shaft, so that the second dislocation wheel is not easy to interfere with the planet wheel and the sun wheel, and the second dislocation wheel is convenient to set.
Preferably, the second offset wheel is in mesh with the sun wheel and the second offset wheel is in a different plane than the planet wheel.
In this scheme, the wheel thickness of sun gear is great in order to satisfy simultaneously meshing planet wheel and second dislocation wheel, and second dislocation wheel and sun gear direct engagement, second dislocation wheel and planet wheel lie in different planes simultaneously, avoid second dislocation wheel and planet wheel to take place to interfere, and this arrangement mode has saved the quantity of gear.
Preferably, the speed regulating motor gear train comprises a first speed regulating wheel, the first speed regulating wheel is meshed with the speed regulating gear ring, and the speed regulating motor is externally connected with the first speed regulating wheel.
In the scheme, the speed regulating motor is externally connected with the first speed regulating wheel, and the engagement of the speed regulating motor and the speed regulating gear ring is realized through the engagement of the first speed regulating wheel and the speed regulating gear ring, so that the speed regulating gear ring can output rotation to the speed regulating motor for power generation, and the speed regulating motor can also output the rotation to the speed regulating gear ring for synthesis of the rotation output by the output shaft.
In a second aspect, the invention provides a wind turbine, which comprises the wind turbine speed regulating device, a wind wheel and a synchronous generator, wherein the wind wheel is connected to a first input shaft of the differential gear train, and the synchronous generator is connected with the output shaft.
In the scheme, the wind turbine captures the power of external wind through a wind wheel, and the rotation of the wind wheel is transmitted to a differential gear train through a first input shaft and is output to a speed regulating motor and/or a synchronous generator through the differential gear train; when the external wind speed is too small, the feedback clutch is closed, the torque of the output shaft is transmitted to the speed regulating gear ring through the feedback gear train, and the torque is transmitted to the speed regulating motor through the speed regulating gear ring to be supplied to the speed regulating motor for power generation; when the external wind speed rises, the rotating speed of the output shaft reaches the set rotating speed, the feedback clutch is opened, the output shaft stops feeding back the torque to the speed-regulating gear ring, and the torque is output to the synchronous generator for the synchronous generator to generate power; therefore, the wind turbine generator does not need to set cut-in wind speed, the speed regulating motor generates power at a lower wind speed, the synchronous generator is in an idling mode, the cut-in wind speed does not need to be set, and the power generation efficiency is improved; meanwhile, the rotating speed of the output shaft is gradually increased to the set rotating speed along with the increase of the external wind speed, so that the soft start grid connection of the synchronous generator is realized, and the impact of the synchronous generator during the starting is reduced.
In a third aspect, the present invention provides a control method for a wind turbine, implemented by using a wind turbine as described above, the control method including the following steps:
when the rotating speed of the output shaft is smaller than the set rotating speed, the feedback clutch is controlled to be closed, the synchronous generator is disconnected from the power grid, and the speed regulating motor is controlled to be in a power generation mode;
when the rotating speed of the output shaft is larger than or equal to the set rotating speed, the feedback clutch is controlled to be opened, the synchronous generator is electrically connected with the power grid, and the speed regulating motor is controlled to be switched to an electric mode.
In the scheme, when the external wind speed is lower, the rotating speed of the output shaft is smaller than the set rotating speed, at the moment, the feedback clutch is controlled to be closed, the synchronous generator is disconnected from the power grid, and the torque of the output shaft is transmitted to the speed regulation gear ring through the feedback gear train and then is output to the speed regulation motor for power generation of the speed regulation motor; as the external wind speed increases, the rotating speed of the output shaft increases, when the rotating speed of the output shaft is greater than or equal to the set rotating speed, the feedback clutch is controlled to be disconnected, the synchronous generator is electrically connected with the power grid, and the torque of the output shaft is output to the synchronous generator to generate power; at the moment, the speed regulating motor is switched into an electric mode, the speed regulating motor outputs rotation to the speed regulating gear ring, and the rotation input through the first input shaft are combined into a constant set rotation speed so as to be used for stably generating electricity by the synchronous generator; therefore, wind energy is utilized to generate electricity under the condition of low wind speed, the electricity generation efficiency of the wind turbine generator is improved, meanwhile, soft start grid connection of the synchronous generator is realized, and the impact of the synchronous generator during starting is reduced.
The invention has the positive progress effects that:
according to the wind turbine generator speed regulating device, the feedback gear train is arranged, the torque of the output shaft of the differential gear train is transmitted to the speed regulating gear ring of the differential gear train, and the torque is transmitted to the speed regulating motor through the speed regulating gear ring and the speed regulating motor gear train, so that the torque transmitted to the speed regulating motor is increased, and therefore, even if the rotating speed of the input wind turbine generator speed regulating device is small, the transmitted torque can be increased to drive the speed regulating motor to rotate for power generation, low-wind-speed wind energy is fully utilized, and the power generation efficiency of the wind turbine generator is improved; meanwhile, when the feedback gear train is required to transmit torque, the transmission gear set can be kept engaged with the speed regulation gear ring and the output shaft by controlling the feedback clutch to be closed; when the feedback gear train is not needed to feed back the torque, the transmission gear set, the speed regulation gear ring and the output shaft can be disconnected by controlling the feedback clutch to be opened, so that the output shaft can output the torque for the synchronous generator to generate power.
Drawings
Fig. 1 is a schematic structural diagram of a wind turbine generator according to embodiment 1 of the present invention.
Fig. 2 is a schematic structural view of a differential gear box according to embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of a differential gear system according to embodiment 1 of the present invention.
Fig. 4 is a schematic diagram of a torque rotation speed characteristic of a speed regulating motor according to an embodiment of the present invention.
Fig. 5 is a schematic structural view of a differential gear box according to embodiment 2 of the present invention.
Fig. 6 is a schematic structural view of a differential gear box according to embodiment 3 of the present invention.
Fig. 7 is a schematic structural view of a differential gear box according to embodiment 4 of the present invention.
Reference numerals illustrate:
wind wheel 1
Speed increasing gear box 2
Differential gear train 3
Planet carrier 31
Speed-regulating gear ring 32
Sun gear 33
Planetary gears 34
Output shaft 35
First input shaft 36
Speed regulating motor wheel train 4
First speed regulating clutch 41
Second flywheel 42
Third flywheel 43
First flywheel 44
Fifth flywheel 45
Second input shaft 46
Second speed regulating clutch 47
Fourth flywheel 48
Feedback gear train 5
Second feedback wheel 51
Steering wheel 52
Feedback clutch 53
First feedback wheel 54
First dislocation wheel 55
Third feedback wheel 56
Second dislocation wheel 57
Third dislocation wheel 58
Speed regulating motor 6
Synchronous generator 7
Support member 8
Radial bearing 9
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention.
Example 1
The embodiment discloses a wind turbine, and referring to fig. 1, the wind turbine comprises a wind wheel 1, a wind turbine speed regulating device and a synchronous generator 7. The wind wheel 1 is used for capturing external wind energy, the wind turbine speed regulating device is respectively connected with the wind wheel 1 and the synchronous generator 7, and the synchronous generator 7 can receive rotation of the wind turbine speed regulating device and is used for generating power.
In this embodiment, the wind turbine further includes a speed increasing gearbox 2, where the speed increasing gearbox 2 is connected to the wind turbine 1 and the wind turbine speed adjusting device respectively, and rotation of the wind turbine 1 is input to the wind turbine speed adjusting device after being increased by the speed increasing gearbox 2, so that the wind turbine speed adjusting device adjusts the rotation.
Referring to fig. 1 and 2, the wind turbine generator speed regulating device comprises a differential gear speed regulating box, a speed regulating motor 6 and a controller. The differential gear speed box is connected with the speed increasing gear box 2. The speed regulating motor 6 is externally connected with the differential gear speed regulating box so as to provide rotation for the rotation regulating speed increasing gearbox 2 to input the rotation of the differential gear speed regulating box or consume the rotation of the speed increasing gearbox 2 input the differential gear speed regulating box to generate power. The controller is used for switching the speed regulating motor 6 into an electric mode or a power generation mode, switching on and off a transmission path in the differential gear speed regulating box and switching on or off the synchronous generator 7 from the power grid.
Referring to fig. 1 and 2, the differential speed gearbox comprises a differential gear train 3, a speed motor train 4 and a feedback gear train 5. The differential gear train 3 has a first input shaft 36 and an output shaft 35, the step-up gear box 2 is connected to the first input shaft 36, and the synchronous generator 7 is connected to the output shaft 35. The gear train 4 of the speed regulating motor is connected with the differential gear train 3 and externally connected with the speed regulating motor 6. The feedback gear train 5 is coupled to the differential gear train 3 for transmitting torque of the output shaft 35 to the speed motor 6 for the speed motor 6 to generate electricity.
Referring to fig. 2 and 3, the differential gear train 3 includes a carrier 31, a planetary gear 34, a sun gear 33, and a ring gear 32. The rotational axis of the planet carrier 31 is connected to a first input shaft 36. The sun gear 33 is connected to the output shaft 35, and the carrier 31, the sun gear 33, the ring gear 32, and the output shaft 35 are coaxially arranged. The ring gear 32 is engaged with the gear train 4 of the speed motor. The planet wheel 34 is rotatably arranged on the planet carrier 31, the planet wheel 34 and the sun wheel 33 are both arranged on the inner ring of the speed regulation gear ring 32, and the planet wheel 34 is meshed with the sun wheel 33 and the inner teeth of the speed regulation gear ring 32 at the same time.
The number of the planetary gears 34 may be one or more. In this embodiment, the planetary gears 34 are provided in plurality, and when one planetary gear 34 is damaged, other planetary gears 34 can also work normally, so that the fault tolerance of the differential gear train 3 is improved. Specifically, the present embodiment is shown with three planets 34. In other embodiments, the number of planets 34 may be other suitable values.
The rotation speed of the ring gear 32, the rotation speed of the carrier 31, and the rotation speed of the sun gear 33 satisfy the following expression for the differential gear train 3:
Figure BDA0004094065650000101
wherein: k is the ratio of the number of teeth of the ring gear 32 to the number of teeth of the sun gear 33, n pc For the rotational speed of the planet carrier 31, n r To regulate the rotational speed of the ring gear 32, n s Is the rotational speed of the sun gear 33.
When the synchronous generator 7 generates electricity, the rotation speed of the synchronous generator 7 is kept at a constant set rotation speed, namely n, so as to ensure that the frequency of the generated current is kept stable and is convenient to be integrated into a power grid s Is a fixed value. As can be seen from the above equation, the rotational speed of the ring gear 32 is a linear function of the rotational speed of the carrier 31. When the wind speed is low, the rotational speed n of the carrier 31 pc Smaller, to make the rotation speed n of the sun gear 33 s The speed-regulating motor 6 operates in an electric mode and outputs rotation to the speed-regulating gear ring 32 to make the speed n of the speed-regulating gear ring 32 be the same as the set speed r Is negative, i.e. the direction of rotation of the ring gear 32 is opposite to the direction of rotation of the sun gear 33. When the wind speed is too high, the rotational speed n of the carrier 31 pc Larger, to make the rotation speed n of the sun gear 33 s The rotation speed n of the ring gear 32 is regulated while maintaining the set rotation speed r Should be positive, i.e. the rotational direction of the ring gear 32 is too greatThe rotation direction of the sun gear 33 is the same, the ring gear 32 outputs rotation to the ring gear 6, and the ring gear 6 operates in a power generation mode to consume torque of the ring gear 32 to adjust the rotation speed of the ring gear 32 in the forward direction, so that the rotation speed of the sun gear 33 is maintained at a constant rotation speed.
The ratio k of the number of teeth of the ring gear 32 to the number of teeth of the sun gear 33 is generally greater than 2, and may be specifically designed according to the requirement, where the k value in this embodiment is specifically 2.3. The set rotational speed can be designed according to the frequency of the current of the synchronous generator 7 in the grid connection, and in this embodiment, the set rotational speed is specifically 1500rpm.
In this embodiment, the gear teeth are disposed inside and outside the speed-adjusting gear ring 32, and the speed-adjusting motor train 4 is engaged with the outer ring of the speed-adjusting gear ring 32, so that the rotation of the gear ring can be transmitted to the speed-adjusting motor 6 through the speed-adjusting motor train 4 to generate electricity by the speed-adjusting motor 6, or the rotation of the speed-adjusting motor 6 can be input to the speed-adjusting gear ring 32 and then combined with the rotation input by the first input shaft 36. Furthermore, in other embodiments, the flywheel motor train 4 may also be engaged with the inner ring of the flywheel gear 32, as long as the axial thickness of the flywheel gear 32 is correspondingly increased, so that the flywheel motor train 4 is not likely to interfere with other structures of the differential gear train 3.
When the outside wind speed is too low, the rotational speed n of the carrier 31 pc If the speed regulating motor 6 is adopted to regulate the speed so that the rotating speed of the synchronous generator 7 reaches the set rotating speed, the rotating speed and the energy consumption of the speed regulating motor 6 are too high, so that the cost is too high, and the requirements of energy conservation and economy are not met. In the related art, wind energy with a wind speed lower than the cut-in wind speed is rejected by setting the cut-in wind speed (e.g., 3 m/s).
Referring to fig. 2, in the present embodiment, the feedback gear train 5 includes a gear set and a feedback clutch 53, the gear set is respectively coupled to the ring gear 32 and the output shaft 35, and the feedback clutch 53 is disposed on the gear set for controlling connection or disconnection of the gear set.
The transmission wheel set includes a first feedback wheel 54, a steering wheel 52 and a second feedback wheel 51, the first feedback wheel 54 is engaged with the output shaft 35, the second feedback wheel 51 is engaged with the external teeth of the speed regulation gear ring 32, the steering wheel 52 is engaged with the first feedback wheel 54, the steering wheel 52 and the second feedback wheel 51 are coaxially arranged on the same rotating shaft, and the steering wheel 52 is connected with and disconnected from the second feedback wheel 51 through a feedback clutch 53.
Specifically, in this embodiment, the driving wheel set further includes a first dislocation wheel 55, and the first dislocation wheel 55 is fixedly disposed on the output shaft 35. The first offset wheel 55 is arranged coaxially and at a distance from the sun wheel 33 such that the first offset wheel 55 is located in a different plane than the planet wheels 34 and the planet carrier 31, and the first feedback wheel 54 is engaged with the first offset wheel 55, whereby the first feedback wheel 54 is not located in the same plane as the planet wheels 34 and the planet carrier 31, and interference of the first feedback wheel 54 with the planet wheels 34 or the planet carrier 31 is avoided.
The torque of the output shaft 35 is transmitted to the speed-adjusting gear ring 32 through the first dislocation wheel 55, the first feedback wheel 54, the steering wheel 52 and the second feedback wheel 51 in sequence, so that the torque of the output shaft 35 is transmitted to the speed-adjusting motor 6 to be used for power generation of the speed-adjusting motor 6.
As can be seen from the connection relationship of the gears, the first offset wheel 55 rotates coaxially and synchronously with the sun wheel 33 and the output shaft 35, the first feedback wheel 54 rotates in the opposite direction to the first offset wheel 55, the steering wheel 52 rotates in the opposite direction to the first feedback wheel 54, and the second feedback wheel 51 rotates in the same direction as the steering wheel 52, i.e., the second feedback wheel 51 rotates in the same direction as the output shaft 35, so that the steering of the ring gear 32 is opposite to the steering of the output shaft 35 and the sun wheel 33. Thus, when the rotation speed of the output shaft 35 increases to the set rotation speed, the rotation direction of the speed-adjusting motor 6 is consistent in the process of switching the speed-adjusting motor 6 from the power generation mode to the electric mode, so that the speed-adjusting motor 6 is prevented from being impacted excessively due to rapid reverse rotation of the speed-adjusting motor 6.
Referring to fig. 2, a feedback clutch 53 is provided at one end of the rotation shaft where the second feedback wheel 51 is located, and a steering wheel 52 is fixedly provided outside the feedback clutch 53. When the feedback clutch 53 is closed, the steering wheel 52 is fixedly connected with the rotating shaft where the second feedback wheel 51 is located, so that the steering wheel 52 can drive the rotating shaft and the second feedback wheel 51 to rotate; when the feedback clutch 53 is opened, the steering wheel 52 is disconnected from the rotation shaft where the second feedback wheel 51 is located, and the rotation of the steering wheel 52 cannot be transmitted to the second feedback wheel 51.
Thus, when the feedback clutch 53 is closed, the torque of the output shaft 35 can be transmitted to the speed-adjusting gear ring 32 through the feedback gear train 5, so that the speed-adjusting motor 6 can generate power; when the feedback clutch 53 is opened, the transmission path formed by the feedback gear train 5 is disconnected, and the torque of the output shaft 35 cannot be fed back to the ring gear 32 via the feedback gear train 5.
When the external wind speed is too low, the rotation speed of the output shaft 35 is smaller than the set rotation speed, the controller controls the synchronous generator 7 to be disconnected from the power grid and controls the speed regulating motor 6 to operate in a power generation mode, at the moment, the controller controls the feedback clutch 53 to be closed, the feedback gear train 5 transmits the torque of the output shaft 35 of the differential gear train 3 to the speed regulating gear ring 32 of the differential gear train 3, and the torque is transmitted to the speed regulating motor 6 through the speed regulating gear ring 32 and the speed regulating motor gear train 4, so that the torque transmitted to the speed regulating motor 6 is increased. Therefore, even if the external wind speed is very small, the rotating speed of the speed regulating device input into the wind turbine generator is very small, the speed regulating motor 6 can be driven to rotate to generate power by increasing the transmitted torque, the wind energy with low wind speed is fully utilized, and the power generation efficiency of the wind turbine generator is improved.
In some preferred embodiments, the speed-adjusting motor 6 is externally connected with a frequency modulator, and the current sent by the speed-adjusting motor 6 is converted through the frequency modulator so as to conveniently utilize and convey the current sent by the speed-adjusting motor 6.
In the wind turbine generator set with the cut-in wind speed, when the external wind speed reaches the cut-in wind speed, the speed regulating motor 6 needs to be started quickly, and the rotating speed of the synchronous generator 7 is enabled to reach the set rotating speed quickly. In this embodiment, the rotation speed of the output shaft 35 gradually increases to a set value along with the increase of the external wind speed, and then the synchronous generator 7 is connected to the grid, so that the soft start grid connection of the synchronous generator 7 is realized, the impact on the motor and the power grid when the synchronous generator 7 is connected to the grid is reduced, and the reliability of the wind turbine generator is improved.
As the external wind speed increases so that the rotational speed of the output shaft 35 is greater than or equal to the set rotational speed, the controller controls the synchronous generator 7 to be integrated into the power grid and controls the speed regulating motor 6 to switch to the electric mode, at this time, the controller controls the feedback clutch 53 to be disconnected so that the feedback gear train 5 is disconnected from the differential gear train 3 and the speed regulating motor 6, the torque of the output shaft 35 is output to the synchronous generator 7 to generate electricity, and the speed regulating motor 6 outputs rotation of which the rotational speed varies with the rotational speed of the carrier 31 to the speed regulating gear ring 32 so that the rotational speed of the output shaft 35 is maintained at the set rotational speed.
Referring to fig. 2 and 3, the gear train 4 of the speed-adjusting motor includes a first speed-adjusting wheel 44, the speed-adjusting motor 6 is externally connected to the first speed-adjusting wheel 44, and engagement between the speed-adjusting motor 6 and the speed-adjusting gear ring 32 is achieved through engagement between the first speed-adjusting wheel 44 and the speed-adjusting gear ring 32, so that the speed-adjusting gear ring 32 can output rotation to the speed-adjusting motor 6 to generate electricity, and the speed-adjusting motor 6 can also output rotation to the speed-adjusting gear ring 32 to synthesize rotation for output by the output shaft 35.
In this embodiment, the first flywheel 44 is meshed with the external teeth of the flywheel ring gear 32. In other embodiments, the ring gear 32 has a greater thickness in the axial direction thereof, and the first flywheel 44 may be disposed in the ring gear 32 and meshed with the internal teeth of the ring gear 32. In this embodiment, the gear ratio of the first flywheel 44 to the flywheel ring gear 32 is 1:6, in other embodiments, the ratio may be other suitable values.
Referring to fig. 2 and 3, the flywheel motor train 4 further includes a power generation wheel set, an electric wheel set, and a second input shaft 46, the flywheel motor 6 is externally connected to the second input shaft 46, the power generation wheel set and the electric wheel set are both engaged with the second input shaft 46, and the flywheel motor 6 can be connected with the first flywheel 44 through the power generation wheel set and the electric wheel set, respectively.
The generator set comprises a second flywheel 42, a third flywheel 43 and a first flywheel clutch 41. The second flywheel 42 and the first flywheel 44 are coaxially and fixedly arranged on the same rotating shaft, the first flywheel 41 is arranged at one end of the second input shaft 46 far away from the flywheel motor 6, the third flywheel 43 is fixedly and coaxially arranged outside the first flywheel 41, and the third flywheel 43 is meshed with the second flywheel 42. When the first speed clutch 41 is closed, the first speed clutch 41 is locked on the second input shaft 46, so that the third speed pulley 43 is fixedly connected with the second input shaft 46; when the first flywheel 41 is opened, the connection between the third flywheel 43 and the second input shaft 46 is broken.
The electric wheel set comprises a fourth flywheel 48, a fifth flywheel 45 and a second speed regulating clutch 47, the first flywheel 44 and the second flywheel 42 are all arranged on the same rotating shaft, the fourth flywheel 48 is fixedly arranged outside the second speed regulating clutch 47, the fifth flywheel 45 is fixedly arranged on the second input shaft 46, and the fourth flywheel 48 is meshed with the fifth flywheel 45. When the second speed regulating clutch 47 is closed, the second speed regulating clutch 47 is locked on the rotating shaft where the first speed regulating wheel 44 is located, so that the fourth speed regulating wheel 48 is relatively fixed with the first speed regulating wheel 44; when the second flywheel 47 is opened, the connection between the fourth flywheel 48 and the first flywheel 44 is broken.
In the present embodiment, the first feedback wheel 54, the first offset wheel 55 and the steering wheel 52 have the same number of teeth, and the second feedback wheel 51 has the same number of teeth as the first flywheel 44. The ratio of the number of teeth of the second flywheel 42 to the number of teeth of the third flywheel 43 is greater than 1, and the number of teeth of the fourth flywheel 48 is the same as the number of teeth of the fifth flywheel 45.
In other embodiments, the tooth relationships of the first feedback wheel 54, the first offset wheel 55, the steering wheel 52, and the first flywheel 44 may be other suitable selections. The gear ratios of the second gear 42 to the third gear 43 and the fourth gear 48 to the fifth gear 45 may be other suitable values.
In the prior art, if the wind speed is 3m/s when the synchronous generator 7 is required to be connected to the grid for power generation, the speed regulating motor 6 works in an electric mode, and the rotating speed of the speed regulating motor 6 is increased to 2256rpm before the wind speed is 3m/s, so that the rotating speed of the synchronous generator 7 is ensured to reach 1500rpm. The smaller the cut-in wind speed is set, the greater the rotation speed of the speed regulating motor 6.
In this embodiment, when the external wind speed is too low, the feedback clutch 53 is closed, the first speed regulating clutch 41 is opened, the second speed regulating clutch 47 is closed, the speed regulating motor 6 is in the power generation mode, and the synchronous generator 7 is disconnected from the power grid (i.e., the synchronous generator 7 idles at this time). At this time, the rotation speed of the speed-adjusting motor 6 is the same as that of the synchronous generator 7. In this embodiment, the grid-connected rotation speed of the synchronous generator 7 is 1500rpm, so that the running rotation speed of the speed-regulating motor 6 during power generation at low wind speed is lower than 1500rpm, and the lower the wind speed is, the lower the rotation speed of the speed-regulating motor 6 is, so that the reliability of the speed-regulating motor 6 and related components such as bearings thereof is improved.
Referring to fig. 4, when the speed-adjusting motor 6 of the present embodiment generates electricity at a low wind speed (as shown in the fourth quadrant in fig. 4), the rotational speed of the speed-adjusting motor 6 increases as the wind speed increases, and the torque of the speed-adjusting motor 6 increases as the rotational speed of the speed-adjusting motor 6 increases.
When the speed regulating motor 6 singly generates electricity, the external wind speed is smaller, the provided torque is smaller, and the torque required by the power generation of the speed regulating motor 6 is not required to be reduced through the power generation wheel set, so that the speed regulating motor 6 is connected with the first speed regulating wheel 44 through the electric wheel set; when the speed regulating motor 6 is in the electric mode, the speed regulating motor 6 is connected with the first speed regulating wheel 44 through the electric wheel set in order to avoid the impact on the speed regulating motor 6 caused by the overlarge rotating speed of the speed regulating motor 6.
As the wind speed increases, the rotational speeds of the speed regulating motor 6 and the output shaft 35 gradually increase to be greater than or equal to the set rotational speed, that is, the rotational speed of the synchronous generator 7 reaches 1500rpm in this embodiment, the synchronous generator 7 is connected to the grid for generating power. At this time, the controller controls the feedback clutch 53 to open and controls the synchronous generator 7 to be incorporated into the grid to generate electricity, and the speed motor 6 is switched to the electric mode. The rotation direction of the speed-adjusting motor 6 is opposite to that at the time of low wind speed power generation (refer to the first quadrant in fig. 4), and as the wind speed increases, the rotation speed of the speed-adjusting motor 6 gradually decreases and the torque gradually increases.
With further increase of the wind speed, the rotation speed of the speed regulating motor 6 gradually decreases, and when the wind speed increases to a rotation speed which does not need to be input by the speed regulating motor 6, the rotation speed of the speed regulating motor 6 becomes 0 when the output shaft 35 rotates at the set rotation speed. When the wind speed increases even further, the controller controls the speed-adjusting motor 6 to switch to the power generation mode, and controls the first speed-adjusting clutch 41 to close and the second speed-adjusting clutch 47 to open, and at this time, the rotation direction of the speed-adjusting motor 6 is the same as the rotation direction in the electric mode (as shown in the second quadrant in fig. 4). At this time, the synchronous generator 7 generates electricity, and when the speed regulating motor 6 is in the electricity generation mode, the speed regulating motor 6 is engaged with the first speed regulating wheel 44 through the electricity generation wheel set. Since the gear ratio of the second flywheel 42 to the third flywheel 43 is greater than 1, when both the synchronous generator 7 and the flywheel 6 generate electricity, the rotation speed of the flywheel 6 can be increased and the torque required for the flywheel 6 to generate electricity can be reduced compared with the manner in which the flywheel 6 is directly connected to the first flywheel 44, thereby reducing the weight and size of the flywheel 6 and saving the manufacturing cost of the flywheel 6.
In addition, during the hub entering, maintenance and repair, the feedback clutch 53, the first speed regulating clutch 41 and the second speed regulating clutch 47 are all set to be in a closed state, and the locking of the wind wheel 1 is realized through gear engagement. Therefore, the locking device of the wind wheel 1 in the shafting can be omitted, and the cost is reduced.
When the single blade is hoisted, the feedback clutch 53 in the torque feedback gear train 5 is closed, the first speed regulating clutch 41 of the speed regulating motor gear train 4 is closed, and the second speed regulating clutch 47 is opened. The speed regulating motor 6 is used for reducing speed and increasing torque, runs with small torque, and increases torque through the differential gear speed regulating box to drag the wind wheel to rotate, so that single-blade hoisting is realized. Therefore, the single-blade turning tool is avoided, and the corresponding cost is saved.
Example 2
The wind turbine generator system of this embodiment is substantially the same as that of embodiment 1, except that:
referring to fig. 5, in the present embodiment, the thickness of the sun gear 33 in the axial direction thereof is large so that the sun gear 33 simultaneously engages the planetary gear and the first feedback gear 54. The first feedback wheel 54 is directly meshed with the sun wheel 33 and the first feedback wheel 54 and the planet wheels 34 are located in different planes to avoid interference of the first feedback wheel 54 with the planet wheels 34, so that in this embodiment, the first dislocation wheel 55 is not required.
Example 3
The wind turbine generator system of this embodiment is substantially the same as that of embodiment 1, except that:
referring to fig. 6, in the present embodiment, the driving wheel set includes a third feedback wheel 56, a second misalignment wheel 57, and a third misalignment wheel 58. The third feedback wheel 56 is located within the ring gear 32 and is meshed with the internal teeth of the ring gear 32. The third dislocation wheel 58 is coaxially fixed on the output shaft 35, and the third dislocation wheel 58 is arranged at intervals with the sun gear 33. The second dislocation wheel 57 is meshed with the third dislocation wheel 58, and the second dislocation wheel 57 and the third feedback wheel 56 are coaxially arranged on the same rotating shaft. The feedback clutch 53 is disposed at one end of the rotation shaft where the third feedback wheel 56 is located, and the second misalignment wheel 57 is fixed outside the feedback clutch 53.
Wherein the ring gear 32 has a relatively large tooth thickness in its axial direction to meet the simultaneous engagement of the planet 34 and the third feedback wheel 56. The third feedback wheel 56 is located in a different plane than the planet 34 so that the third feedback wheel 56 does not easily interfere with the planet 34 during movement. The second dislocation wheel 57 is disposed on a side of the third feedback wheel 56 away from the planet wheel 34, so as to avoid the rotation of the planet wheel 34 being interfered by the rotation shaft where the third feedback wheel 56 and the second dislocation wheel 57 are located.
In this embodiment, the differential gear speed box further includes a supporting member 8, the supporting member 8 is fixedly disposed in the differential gear speed box, a radial bearing 9 is disposed on the supporting member 8, and a rotating shaft where the third feedback wheel 56 is located passes through the radial bearing 9 of the supporting member, so that the supporting member 8 supports the rotating shaft where the third feedback wheel 56 is located.
Thereby, the torque of the output shaft 35 is sequentially transmitted to the speed-adjusting gear ring 32 through the third dislocation wheel 58, the second dislocation wheel 57 and the third feedback wheel 56, and the connection and disconnection of the transmission paths of the output shaft 35, the second dislocation wheel 57, the third feedback wheel 56 and the speed-adjusting gear ring 32 are realized by controlling the feedback clutch 53 to be closed or opened. The second dislocation wheel 57 is opposite to the rotation direction of the output shaft 35, the second dislocation wheel 57 is identical to the rotation direction of the third feedback wheel 56, and the third feedback wheel 56 is meshed with the internal teeth of the speed regulation gear ring 32, so that the rotation direction of the third feedback wheel 56 is identical to the rotation direction of the speed regulation gear ring 32, and therefore, when the speed regulation motor 6 alone generates electricity, the rotation direction of the speed regulation gear ring 32 is opposite to the rotation direction of the output shaft 35. At the same time, the provision of the second offset wheel 57 makes the third feedback wheel 56 not directly engaged with the output shaft 35, so that the disconnection of the transmission connection between the output shaft 35 and the ring gear 32 can be ensured when the torque transmission using the feedback train 5 is not required.
Example 4
The wind turbine generator system of this embodiment is substantially the same as that of embodiment 3, except that:
referring to fig. 7, in the present embodiment, the sun gear 33 is large in thickness in its axial direction to simultaneously engage the planet gears 34 and the second misalignment wheel 57. The second offset wheel 57 is directly meshed with the sun gear 33, and neither the second offset wheel 57 nor the ring gear 32 nor the planet gears 34 lie in the same plane to avoid interference of the second offset wheel 57 with the ring gear 32 or the planet carrier 31.
Example 5
Referring to fig. 1 to 7, the present embodiment discloses a control method for controlling a wind turbine, where the control method includes the following steps:
when the rotating speed of the output shaft 35 is smaller than the set rotating speed, the controller controls the feedback clutch 53 to be closed, disconnects the synchronous generator 7 from the power grid, controls the first speed regulating clutch 41 to be opened, and controls the second speed regulating clutch 47 to be closed, and controls the speed regulating motor 6 to be in a power generation mode for generating power;
when the rotating speed of the output shaft 35 is greater than or equal to the set rotating speed, the controller controls the feedback clutch 53 to be opened, the synchronous generator 7 is electrically connected with the power grid, and the speed regulating motor 6 is controlled to be switched to an electric mode;
when the wind speed continues to increase and the rotation speed of the speed regulating motor 6 in the electric mode decreases to 0, the controller controls the speed regulating motor 6 to switch to the power generation mode, controls the first speed regulating clutch 41 to be closed and controls the second speed regulating clutch 47 to be opened.
Therefore, when the external wind speed is in a breeze state with a relatively high wind speed, the rotating speed of the output shaft 35 is smaller than the set rotating speed, at the moment, the feedback clutch 53 is controlled to be closed, the synchronous generator 7 is disconnected from the power grid, and the torque of the output shaft 35 is transmitted to the speed regulation gear ring 32 through the feedback gear train 5 and then is output to the speed regulation motor 6 for power generation of the speed regulation motor 6; as the external wind speed increases, the rotation speed of the output shaft 35 increases, when the rotation speed of the output shaft 35 is greater than or equal to the set rotation speed, the feedback clutch 53 is controlled to be disconnected, the synchronous generator 7 is electrically connected with the power grid, and the torque of the output shaft 35 is output to the synchronous generator 7 for power generation; at this time, the speed-adjusting motor 6 is switched to the electric mode, the speed-adjusting motor 6 outputs rotation to the speed-adjusting gear ring 32, and the rotation input through the first input shaft 36 are combined to a constant set rotation speed for the synchronous generator 7 to stably generate electricity; therefore, wind energy is utilized to generate electricity under the condition of low wind speed, the electricity generation efficiency of the wind turbine generator is improved, meanwhile, soft start grid connection of the synchronous generator 7 is realized, and the impact of the synchronous generator 7 during starting is reduced.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the principles and spirit of the invention, but such changes and modifications fall within the scope of the invention.

Claims (12)

1. The wind turbine generator speed regulating device is characterized by comprising a differential gear speed regulating box and a speed regulating motor (6), wherein the differential gear speed regulating box comprises a differential gear train (3) and a speed regulating motor train (4), and the differential gear train (3) comprises a speed regulating gear ring (32), a first input shaft (36) and an output shaft (35) which are used for being connected with the wind turbine generator; the speed regulation gear ring (32) is connected with the speed regulation motor gear train (4), and the speed regulation motor (6) is externally connected with the speed regulation motor gear train (4);
the differential gear speed regulating box further comprises a feedback gear train (5), the feedback gear train (5) comprises a transmission gear set and a feedback clutch (53), the transmission gear set is respectively connected with the speed regulating gear ring (32) and the output shaft (35), and the feedback clutch (53) is arranged on the transmission gear set and used for controlling connection or disconnection of the transmission gear set.
2. A wind turbine governor device according to claim 1, characterized in that the wind turbine governor device further comprises a controller that controls the feedback clutch (53) to close when the rotational speed of the output shaft (35) is less than a set rotational speed, the controller controlling the governor motor (6) to be in a generating mode; when the rotating speed of the output shaft (35) is larger than or equal to the set rotating speed, the controller controls the feedback clutch (53) to be disconnected, and the controller controls the speed regulating motor (6) to be in an electric mode.
3. Wind turbine speed regulating device according to claim 1, wherein the differential gear train (3) further comprises a planet wheel (34), a planet carrier (31) and a sun wheel (33), wherein the planet wheel (34) and the sun wheel (33) are both located in the speed regulating gear ring (32), wherein the sun wheel (33) is fixedly arranged on the output shaft (35), wherein the first input shaft (36) is connected with the planet carrier (31), wherein the planet wheel (34) is rotatably arranged on the planet carrier (31) and wherein the planet wheel (34) is simultaneously meshed with the inner teeth of the speed regulating gear ring (32) and the sun wheel (33).
4. A wind turbine generator system according to claim 3, wherein the drive wheel set comprises a first feedback wheel (54), a steering wheel (52) and a second feedback wheel (51), the first feedback wheel (54) is coupled to the output shaft (35), the second feedback wheel (51) is meshed with the external teeth of the speed regulation gear ring (32), the steering wheel (52) is meshed with the first feedback wheel (54), the steering wheel (52) and the second feedback wheel (51) are coaxially arranged on the same rotating shaft, and the steering wheel (52) is connected and disconnected with the second feedback wheel (51) through the feedback clutch (53).
5. The wind turbine speed regulating device according to claim 4, wherein the feedback gear train further comprises a first dislocation wheel (55) fixedly arranged on the output shaft (35), the first dislocation wheel (55) is coaxial with the sun wheel (33) and is arranged at intervals, and the first feedback wheel (54) is meshed with the first dislocation wheel (55).
6. Wind turbine speed regulating device according to claim 4, wherein the first feedback wheel (54) is in engagement with the sun wheel (33), the first feedback wheel (54) being located on a side of the planet wheel (34) remote from the planet carrier (31), and the first feedback wheel (54) being located in a different plane than the planet wheel (34).
7. A wind turbine speed regulating device according to claim 3, wherein the drive train comprises a third feedback wheel (56) and a second dislocation wheel (57), the third feedback wheel (56) is meshed with the internal teeth of the speed regulating gear ring (32), the third feedback wheel (56) and the planet wheel (34) are located in different planes, and the second dislocation wheel (57) is arranged on one side of the third feedback wheel (56) far away from the planet wheel (34); the second dislocation wheel (57) is connected to the output shaft (35), the second dislocation wheel (57) and the third feedback wheel (56) are coaxially arranged on the same rotating shaft, and the second dislocation wheel (57) is connected with and disconnected from the third feedback wheel (56) through the feedback clutch (53).
8. Wind turbine speed regulating device according to claim 7, wherein the feedback gear train (5) further comprises a third dislocation wheel (58) coaxially arranged on the same rotation shaft as the sun wheel (33), the third dislocation wheel (58) is arranged at intervals with the sun wheel (33), and the second dislocation wheel (57) is meshed with the third dislocation wheel (55).
9. Wind turbine governor device according to claim 7, characterized in that the second dislocation wheel (57) is in engagement with the sun wheel (33) and the second dislocation wheel (57) is in a different plane than the planet wheel (34).
10. Wind turbine generator system according to claim 1, wherein the flywheel system (4) comprises a first flywheel (44), wherein the first flywheel (44) is engaged with the flywheel ring gear (32), and wherein the flywheel motor (6) is circumscribed to the first flywheel (44).
11. Wind turbine generator system, comprising a wind turbine generator speed regulating device according to any of the claims 1-10, said wind turbine generator system further comprising a wind wheel (1) and a synchronous generator (7), said wind wheel (1) being connected to a first input shaft (36) of said differential gear train (3), said synchronous generator (7) being connected to said output shaft (35).
12. A control method of a wind turbine, for controlling a wind turbine according to claim 11, the control method comprising the steps of:
when the rotating speed of the output shaft (35) is smaller than the set rotating speed, the feedback clutch (53) is controlled to be closed, the synchronous generator (7) is disconnected from the power grid, and the speed regulating motor (6) is controlled to be in a power generation mode;
when the rotating speed of the output shaft (35) is larger than or equal to the set rotating speed, the feedback clutch (53) is controlled to be opened, the synchronous generator (7) is electrically connected with a power grid, and the speed regulating motor (6) is controlled to be switched to an electric mode.
CN202310160768.4A 2023-02-23 2023-02-23 Wind turbine generator speed regulating device, wind turbine generator and control method thereof Pending CN116335879A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310160768.4A CN116335879A (en) 2023-02-23 2023-02-23 Wind turbine generator speed regulating device, wind turbine generator and control method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310160768.4A CN116335879A (en) 2023-02-23 2023-02-23 Wind turbine generator speed regulating device, wind turbine generator and control method thereof

Publications (1)

Publication Number Publication Date
CN116335879A true CN116335879A (en) 2023-06-27

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310160768.4A Pending CN116335879A (en) 2023-02-23 2023-02-23 Wind turbine generator speed regulating device, wind turbine generator and control method thereof

Country Status (1)

Country Link
CN (1) CN116335879A (en)

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