CN216649496U - Wind power generation system with asynchronous speed regulator - Google Patents

Wind power generation system with asynchronous speed regulator Download PDF

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Publication number
CN216649496U
CN216649496U CN202122808795.7U CN202122808795U CN216649496U CN 216649496 U CN216649496 U CN 216649496U CN 202122808795 U CN202122808795 U CN 202122808795U CN 216649496 U CN216649496 U CN 216649496U
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rotor
inner rotor
outer rotor
asynchronous
speed
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Inventor
白宁
沈峰
陈俊
王愐
李海鹏
韩雨辰
王际辉
兰昊
牛明宇
董博
李莹
王曙光
王绪伟
刑学奇
赵钊
李鹏
刘腾飞
冯晨
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State Power Investment Group Science and Technology Research Institute Co Ltd
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State Power Investment Group Science and Technology Research Institute Co Ltd
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    • 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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Abstract

The application provides a wind power generation system with an asynchronous speed regulator. The impeller is used for being pushed by wind energy to rotate, the asynchronous speed regulator comprises an outer rotor, an inner rotor and a displacement device, the outer rotor is sleeved on the inner rotor and is spaced from the inner rotor to form an air gap, a magnetic field is formed in the air gap, the impeller is in transmission connection with one of the outer rotor and the inner rotor to drive the other to rotate, the displacement device is connected with at least one of the outer rotor and the inner rotor, the displacement device is used for adjusting the relative position between the outer rotor and the inner rotor along the axial direction to change the coupling area between the outer rotor and the inner rotor to enable the rotating speed of the other to be constant, and the other is in transmission connection with the input end of the synchronous generator to drive the synchronous generator to stably generate power and output constant-frequency electric energy.

Description

Wind power generation system with asynchronous speed regulator
Technical Field
The utility model relates to the technical field of wind power generation, in particular to a wind power generation system with an asynchronous speed regulator.
Background
The traditional wind power generation system comprises an impeller, a generator and a frequency converter, wherein the impeller is driven by wind energy to rotate so as to drive the generator to generate power, and the rotating speed of the impeller is greatly influenced by wind conditions, so that under complex wind conditions, if electric energy generated by an engine is incorporated into a power grid, power electronic devices such as an inverter need to be matched, the power electronic devices are static equipment, rotational inertia hardly exists, necessary voltage and frequency support cannot be provided for the power grid, and the risk of large frequency deviation of the power grid is increased.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. To this end, embodiments of the present invention propose a wind power generation system with an asynchronous governor.
According to an embodiment of the utility model, a wind power generation system with an asynchronous speed regulator comprises: the impeller is used for being pushed by wind energy to rotate; the asynchronous speed regulator comprises an outer rotor, an inner rotor and a displacement device, the outer rotor is sleeved on the inner rotor and is spaced from the inner rotor to form an air gap, a magnetic field is formed in the air gap, the impeller is in transmission connection with one of the outer rotor and the inner rotor to drive the outer rotor and the inner rotor to rotate so as to drive the other one of the outer rotor and the inner rotor to rotate, the displacement device is connected with at least one of the outer rotor and the inner rotor, and the displacement device is used for adjusting the relative position between the outer rotor and the inner rotor along the axial direction so as to change the coupling area between the outer rotor and the inner rotor to enable the rotating speed of the other one of the outer rotor and the inner rotor to be kept constant; and the other synchronous generator is in transmission connection with the input end of the synchronous generator so as to drive the synchronous generator to stably generate power and output constant-frequency electric energy.
According to the wind power generation system provided by the embodiment of the utility model, the asynchronous speed regulator with the adjustable speed ratio is arranged, so that the kinetic energy of the impeller can be stably input into the synchronous generator, the synchronous generator can generate power at a constant frequency, the synchronous generator can directly transmit power to a power grid, and power electronic devices such as an inverter in the traditional wind power generation system are replaced. The constant output rotating speed of the asynchronous speed regulator realizes the stable output of the current frequency of the wind power generation system, can cope with complex wind conditions, and effectively solves the current grid connection problem caused by complex wind conditions in the transmission wind power generation system.
In addition, because the wind power generation system provided by the application does not need to adopt decoupling, rectification, frequency modulation and voltage stabilization of the power electronic device when being connected to the grid, the problem that the total rotational inertia is continuously reduced due to the use of the power electronic device in the current power grid is solved, the rotational inertia in the power grid can be improved, necessary voltage and frequency support is provided for the power grid, the risk of large frequency deviation of the power grid is reduced, the power system can safely and stably operate, and the capability of the power grid for efficiently receiving new energy is improved.
In some embodiments, the outer rotor is a permanent magnet rotor comprising permanent magnets, the inner rotor is a conductor rotor comprising rotor windings.
In some embodiments, the outer rotor is a conductor rotor comprising rotor windings, and the inner rotor is a permanent magnet rotor comprising permanent magnets.
In some embodiments, the impeller is in transmission connection with the outer rotor, and the displacement device is connected with the inner rotor for adjusting the relative position of the inner rotor and the outer rotor along the axial direction of the inner rotor.
In some embodiments, the wind power generation system further comprises a speed change device, the impeller is in driving connection with an input end of the speed change device, and an output end of the speed change device is in driving connection with the one.
In some embodiments, the transmission is a transmission having a fixed transmission ratio.
In some embodiments, the transmission is a variable ratio transmission.
In some embodiments, the transmission is a gear transmission, a torque converter, a magnetic variator, or a permanent magnet transmission.
In some embodiments, the wind power generation system comprises a controller for adjusting the relative position between the outer rotor and the inner rotor so that the rotational speed of the other is constant at a preset value, the controller comprising:
an input rotation speed detection module for detecting a rotation speed of the one;
the operation module is used for calculating an ideal coupling area between the outer rotor and the inner rotor according to the preset value and the rotating speed of the preset value;
the control module is used for regulating and controlling the relative position between the outer rotor and the inner rotor through the displacement device so as to enable the coupling area between the outer rotor and the inner rotor to reach the ideal coupling area.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the utility model.
Drawings
Fig. 1 is a schematic view of a wind power generation system according to a first embodiment of the present invention.
FIG. 2 is a schematic view of a wind power system according to a second embodiment of the utility model.
FIG. 3 is a schematic view of a wind power system according to a third embodiment of the utility model.
Reference numerals:
a wind power generation system 1; an impeller 11; an asynchronous governor 12; an outer rotor 121; an inner rotor 122; a synchronous generator 13; a displacement device 14; a first transmission 15; a second transmission 16.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.
A wind power system 1 according to an embodiment of the utility model is described below with reference to fig. 1-3. As shown in fig. 1, a wind power generation system 1 according to an embodiment of the present invention includes an impeller 11, an asynchronous governor 12, and a synchronous generator 13.
The impeller 11 is driven by wind energy to rotate to generate kinetic energy. The asynchronous governor 12 is used to conduct the rotational inertia of the impeller 11 due to the rotation and to drive the synchronous generator 13 to generate and output electric power.
The asynchronous governor 12 includes an outer rotor 121, an inner rotor 122 and a displacement device 14, the outer rotor 121 is sleeved on the inner rotor 122 and is coaxial with the inner rotor 122, an air gap is formed between the outer rotor 121 and the inner rotor 122 at an interval, and a magnetic field is provided in the air gap. The outer rotor 121 and the inner rotor 122 can each independently rotate with their respective rotation shafts. When the outer rotor 121 and the inner rotor 122 move relatively, magnetic lines of force move in the conductors to generate induced eddy currents, and then induced magnetic fields are generated on the conductors, so that torque is generated, and one of the active rotations can drive the other one of the active rotations to rotate.
The impeller 11 is in transmission connection with one of the outer rotor 121 and the inner rotor 122, i.e. a driving rotor, and the other is a driven rotor, to drive the rotation thereof. The ratio of the rotational speed of the driving rotor to the rotational speed of the driven rotor is the transmission ratio of the asynchronous governor 12.
In some embodiments, the impeller 11 is in transmission connection with the outer rotor 121 and can drive the outer rotor 121 to rotate, and the outer rotor 121 drives the inner rotor 122 to rotate, in this embodiment, the outer rotor 121 is a driving rotor, and the inner rotor 122 is a driven rotor. In other embodiments, the impeller 11 is in transmission connection with the inner rotor 122 and can drive the inner rotor 122 to rotate, and the inner rotor 122 drives the outer rotor 121 to rotate, in this embodiment, the inner rotor 122 is a driving rotor, and the outer rotor 121 is a driven rotor.
The displacement device 14 is connected to at least one of the outer rotor 121 and the inner rotor 122. The displacement device 14 is used to adjust the relative position between the outer rotor 121 and the inner rotor 122 in the axial direction to vary the coupling area between the outer rotor 121 and the inner rotor 122, thereby enabling the rotational speed of the driven rotor to be kept constant. For example, the displacement device 14 is connected to the inner rotor 122 and is configured to axially move the inner rotor 122, and if the displacement device 14 moves the inner rotor 122 in a direction away from the outer rotor 121 in the axial direction, the coupling area between the outer rotor 121 and the inner rotor 122 decreases, and the transmission ratio of the asynchronous governor 12 increases.
When the driving rotor rotates up under the driving of the impeller 11, in order to keep the rotation speed of the driven rotor constant, the displacement device 14 should reduce the coupling area between the outer rotor 121 and the inner rotor 122 and increase the transmission ratio of the asynchronous governor 12. When the rotation speed of the driving rotor is reduced by the driving of the impeller 11, in order to keep the rotation speed of the driven rotor constant, the displacement device 14 should increase the coupling area between the outer rotor 121 and the inner rotor 122, and the transmission ratio of the asynchronous governor 12 is reduced. The asynchronous governor 12 can be considered a variable ratio transmission.
The driven rotor (the other) is connected to the input of the synchronous generator 13, and since the rotational speed of the driven rotor can be kept constant, the synchronous generator 13 generates electric power which is connected to the grid and inputs electric power having a stable frequency into the grid.
That is, when the impeller 11 is driven by wind energy to rotate, the driving rotor can be driven to rotate at the same time, the kinetic energy generated by the impeller 11 is input into the asynchronous speed regulator 12, the speed of the kinetic energy input from the driving rotor is output by the driven rotor after the speed of the asynchronous speed regulator 12 is changed, and the rotating speed of the driven rotor is constant. The rotation of the driven rotor can drive the synchronous engine 13 to stably generate electricity, and the kinetic energy is converted into electric energy. And the stable input of electric energy from the synchronous generator 13 to the grid is not affected by the variation of the rotation speed of the impeller 11.
According to the wind power generation system provided by the embodiment of the utility model, the asynchronous speed regulator with the adjustable speed ratio is arranged, so that the kinetic energy of the impeller can be stably input into the synchronous generator, the synchronous generator can generate power at a constant frequency, the synchronous generator can directly transmit power to a power grid, and power electronic devices such as an inverter in the traditional wind power generation system are replaced. The constant output rotating speed of the asynchronous speed regulator realizes the stable output of the current frequency of the wind power generation system, can cope with complex wind conditions, and effectively solves the current grid-connection problem caused by complex wind conditions in a transmission wind power generation system.
In addition, because the wind power generation system provided by the application does not need to adopt decoupling, rectification, frequency modulation and voltage stabilization of the power electronic device when being connected to the grid, the problem that the total rotational inertia is continuously reduced due to the use of the power electronic device in the current power grid is solved, the rotational inertia in the power grid can be improved, necessary voltage and frequency support is provided for the power grid, the risk of large frequency deviation of the power grid is reduced, the power system can safely and stably operate, and the capability of the power grid for efficiently receiving new energy is improved.
Alternatively, the driven rotor may rotate at 3000rpm, and the synchronous generator 13 may be capable of stabilizing the current input to the grid at a frequency of 50 Hz. It should be noted that the national grid frequency reference line is 50Hz, and the output rotation speed of the asynchronous speed regulator 12 can be kept constant at 3000 rpm. The frequency reference line of a foreign power grid is 60Hz, the output rotating speed of the asynchronous speed regulator 12 can be kept constant at 3600rpm, and the output rotating speed of the asynchronous speed regulator 12 can be adjusted according to the frequency reference of the power grid.
In order to make the synchronous generator 13 output stable current better, in some embodiments, the wind power generation system 1 further includes a speed changing device connected between the impeller 11 and the asynchronous speed regulator 12, the speed changing device having an input end and an output end, the impeller 11 is in driving connection with the input end of the speed changing device, the output end of the speed changing device is in driving connection with the driving rotor, and the speed changing device is used for changing speed.
That is, the speed change device is used for adjusting the rotating speed of the impeller 11 input into the asynchronous speed regulator 12, and the speed change ratio of the speed change device is the ratio of the input end to the output end. The output rotating speed of the impeller 11 can be better adapted to the rotating speed application range of the asynchronous speed regulator 12 through the speed change of the speed change device, and the load of the asynchronous speed regulator 12 is reduced, namely the output rotating speed of the impeller 11 can be changed to be within an ideal interval of the input rotating speed (the rotating speed of the driving rotor) of the asynchronous speed regulator 12 through the arrangement of the speed change device.
For example, the ideal interval for the input speed of the asynchronous governor 12 is (3000 ± 1000) rpm, and the asynchronous governor 12 is better able to respond to changes in the rotational speed of the inner rotor 122 when the input speed of the asynchronous governor 12 is in the range of (3000 ± 1000) rpm. By providing a transmission having an appropriate gear ratio, the output rotation speed of the impeller 11 can be changed to within this ideal interval of the input rotation speed of the asynchronous governor 12.
Alternatively, the transmission is a transmission having a fixed gear ratio (fixed gear ratio transmission), or a transmission having an adjustable gear ratio (variable gear ratio transmission). The transmission is a transmission with an adjustable transmission ratio, which means that the transmission can be a multi-stage transmission or a continuously variable transmission. The transmission is a multi-stage transmission having a plurality of gear ratios and adjustable in gear ratio according to the rotation speed of the impeller 11, and is a stage transmission continuously adjustable in gear ratio within a certain range.
Alternatively, the variator ratio is 0.03-333.
Alternatively, the transmission is a gear transmission, a torque converter, a magnetic force transducer, a permanent magnet transmission, or a magnetic coupler transmission having one-stage or multi-stage transmission functions.
Note that the rotation speed of the impeller 11 is generally low. Thus, the speed change device may be a speed increasing device, i.e. the output speed of the speed change device is greater than the input speed.
In other embodiments, a speed change device may also be connected between the asynchronous governor 12 and the synchronous generator 13.
In some embodiments, the wind power generation system 1 includes a controller for adjusting the relative position between the outer rotor 121 and the inner rotor 122 so that the rotation speed of the driven rotor is constant at a preset value. The controller comprises an input rotating speed detection module, an operation module and a control module. The input rotating speed detection module is used for detecting the rotating speed of the driving rotor. The operation module is used for calculating an ideal coupling area between the outer rotor 121 and the inner rotor 122 according to a preset value and the rotating speed of the active rotor, and the control module is used for regulating and controlling the relative position between the outer rotor 121 and the inner rotor 122 by controlling the displacement device 14, so that the coupling area between the outer rotor 121 and the inner rotor 122 reaches the ideal coupling area. The preset value of the rotation speed of the driven rotor can be input into the controller in advance.
Several embodiments provided herein are described in detail below with respect to fig. 1-3.
The first embodiment is as follows:
as shown in fig. 1, the wind power generation system 1 includes an impeller 11, an asynchronous governor 12, and a synchronous generator 13. The asynchronous governor 12 includes an outer rotor 121, an inner rotor 122, and a displacement device 14.
In the present embodiment, the outer rotor 121 is an input end of the asynchronous governor 12, and the inner rotor 122 is in transmission connection with an input end of the synchronous generator 13. That is, in the present embodiment, the outer rotor 121 is a driving rotor, the impeller 11 is in transmission connection with the outer rotor 121, and the inner rotor 122 is a driven rotor. The outer rotor 121 is separated from the inner rotor 122 by an air gap. The synchronous generator 13 is connected to the grid through a transformer (not shown) to supply power to the grid.
The outer rotor 121 is a conductor rotor and has a rotor winding, the inner rotor 122 is a permanent magnet rotor and has permanent magnets, the permanent magnets have magnetism so that a magnetic field is formed in an air gap, and magnetic lines of force pass through the outer rotor 121. When the outer rotor 121 rotates under the action of the impeller 11, that is, when relative motion is generated between the outer rotor 121 and the inner rotor 122, the outer rotor 121 cuts magnetic lines, the rotor winding of the outer rotor 121 generates eddy current, the eddy current further generates an induced magnetic field, the induced magnetic field interacts with the magnetic field of the permanent magnet, and has a tendency of preventing the relative motion between the outer rotor 121 and the inner rotor 122, and drives the inner rotor 122 to rotate in the same direction as the outer rotor 121, so that torque transmission from the outer rotor 121 to the inner rotor 122, that is, transmission of rotational inertia is realized. The rotation speed of the inner rotor 122 is related to the rotation speed of the outer rotor 121 and the coupling area.
As shown in fig. 1, a displacement device 14 is connected to the inner rotor 122 for moving the inner rotor 122 in the axial direction so as to change the relative position between the inner rotor 122 and the outer rotor 121, and further change the size of the coupling area (meshing area, coupling length) between the two. The larger the coupling area between the two is, the larger the magnetic field intensity passing through the outer rotor 121 is, the larger the torque is transmitted, and the faster the rotation speed of the inner rotor 122 is. Conversely, the smaller the coupling area between the two is, the smaller the magnetic field intensity passing through the outer rotor 121 is, the smaller the torque transmitted is, and the slower the rotation speed of the inner rotor 122 is.
Therefore, by adjusting the relative positional relationship between the inner rotor 122 and the outer rotor 121 in the axial direction by the displacement device 14, it is possible to achieve smooth and controllable adjustment of the torque transmission relationship therebetween, that is, adjustment of the magnitude of the gear ratio (the ratio of the rotational speeds of the outer rotor 121 and the inner rotor 122) of the asynchronous governor 12.
It will be appreciated by those skilled in the art that the rotational speed of the impeller 11 is constantly changing, resulting in an intermittent change in the mechanical rotational speed of the outer rotor 121. To make the rotation speed of the inner rotor 122 constant:
when the rotating speed of the impeller 11 rises, the rotating speed of the outer rotor 121 is driven to rise, and the displacement control device 14 moves the inner rotor 122 towards the direction far away from the outer rotor 32 so as to reduce the coupling area between the two, thereby increasing the transmission ratio of the asynchronous speed regulator 12;
when the rotation speed of the impeller 11 is reduced, the rotation speed of the outer rotor 121 is reduced, and the control displacement device 14 moves the inner rotor 122 towards the direction close to the outer rotor 32 to increase the coupling area between the two, so that the transmission ratio of the asynchronous speed regulator 12 is reduced. Through the control strategy, the rotating speed of the inner rotor 122 can be kept unchanged, and the inner rotor 122 drives the synchronous generator 13 to generate power at a constant frequency.
That is, in order to keep the rotation speed of the inner rotor 122 constant, a preset value is set thereto, and the relative position between the two is adjusted according to the current rotation speed of the outer rotor 121. The displacement device 14 may be any device capable of implementing a displacement function in the prior art, for example, the displacement device 14 includes a telescopic rod, an air cylinder, an electric actuator, and the like. And will not be described more than here.
Alternatively, the mechanical speed of the inner rotor 122 is constant at 3000 rpm. The output frequency of the synchronous generator 13 is stabilized at 50 Hz.
It should be noted that the national grid frequency reference line is 50Hz, and the rotation speed of the inner rotor 122 may be constant at 3000 rpm. The foreign grid frequency reference line is 60Hz, and the rotating speed of the inner rotor 122 can be constant at 3600rpm, namely the rated rotating speed of the inner rotor 122 can be adjusted according to the grid frequency reference.
In other embodiments, outer rotor 121 may be a permanent magnet rotor with permanent magnets and inner rotor 122 may be a conductor rotor with rotor windings. The outer rotor 32 rotates to generate a rotating magnetic field, the rotor winding of the inner rotor 122 cuts magnetic lines of force to generate eddy current, and the inner rotor 122 rotates in the same direction as the outer rotor 121. Alternatively, the outer and inner rotors 121, 122 may both be conductor rotors, i.e. both have rotor windings that can be energised to produce a magnetic field.
In other embodiments, the impeller 11 may be drivingly connected to the inner rotor 122, that is, the inner rotor 122 may serve as a driving rotor and the outer rotor 121 as a driven rotor.
Furthermore, in other embodiments, displacement device 14 may also be associated with outer rotor 121 for moving outer rotor 121 in an axial direction to vary the coupling area therebetween. Alternatively, the displacement device 14 may also be connected to each of the inner rotor 122 and the outer rotor 121, and the inner rotor 122 and the outer rotor 121 may be moved simultaneously to change the coupling area.
Example two:
as shown in fig. 2, the wind power generation system 1 includes an impeller 11, an asynchronous governor 12, a synchronous generator 13, and a first speed change device 15. The asynchronous governor 12 is similar to the embodiment and will not be described in detail, and only the differences will be described here. The first transmission 15 is a transmission having a fixed gear ratio. In the embodiment, the first speed-changing device 15 is a speed-increasing device, i.e. the output speed is greater than the input speed.
In the present embodiment, the impeller 11 is connected to an input of the first speed changing device 15, an output of the first speed changing device 15 is connected to the outer rotor 121, and the inner rotor 122 is connected to an input of the synchronous generator 13. The first speed changing device 15 increases the rotational speed of the impeller 11 to the desired rotational speed input section of the asynchronous governor 12.
By arranging the first speed changing device 15 between the impeller 11 and the asynchronous speed governor 12, the application range of the rotation speed of the asynchronous speed governor 12 can be better adapted, and the burden on the asynchronous speed governor 12 is reduced, that is, the arrangement of the first speed changing device 15 can change the output rotation speed of the impeller 11 to be within an ideal interval of the input rotation speed of the asynchronous speed governor 12 (the mechanical rotation speed of the outer rotor 121).
Alternatively, the desired interval of the input rotation speed of the asynchronous governor 12 is (3000 ± 1000) rpm, and the output rotation speed of the impeller 11 can be changed to be within the desired interval of the input rotation speed of the asynchronous governor 12 by providing a transmission having a suitable transmission ratio. When the input speed of the asynchronous governor 12 is in the range of (3000 ± 1000) rpm, the asynchronous governor 12 can respond better to the mechanical speed variation of the outer rotor 121 to keep the mechanical speed of the inner rotor 122 constant.
Alternatively, the first transmission 15 has a transmission ratio of 0.03 to 333.
Alternatively, the first transmission device 15 is a gear transmission, a torque converter, a magnetic force transducer, a permanent magnet transmission, or a magnetic coupling transmission device having a speed change function.
Example three:
as shown in fig. 3, the wind power generation system 1 includes an impeller 11, an asynchronous governor 12, a synchronous generator 13, and a second speed change device 16. The asynchronous governor 12 is similar to the embodiment and will not be described in detail, and only the differences will be described here. The second transmission device 16 is a transmission device having a variable transmission ratio, i.e., the transmission ratio of the second transmission device 16 is adjustable. In the present embodiment, the second speed changing device 16 is a speed increasing device, i.e. the output speed is greater than the input speed.
In the present embodiment, the impeller 11 is connected to an input of the second speed changing device 16, an output of the second speed changing device 16 is connected to the outer rotor 121, and the inner rotor 122 is connected to an input of the synchronous generator 13. The second speed changing device 16 increases the rotational speed of the impeller 11 to the desired rotational speed input section of the asynchronous governor 12.
Alternatively, the second transmission device 16 may be a multi-stage transmission device, i.e., the second transmission device 16 has a plurality of transmission ratios and is switchable according to the rotation speed of the impeller 11. Alternatively, the second transmission device 16 may be a continuously variable transmission device, i.e., the second transmission device 16 may continuously adjust its transmission ratio within a certain range.
Alternatively, the second transmission device 16 is a gear transmission, a torque converter, a magnetic force transducer, a permanent magnet transmission, or a magnetic coupling transmission device having a multi-stage or continuously variable transmission function.
By providing the second transmission 16 with an adjustable transmission ratio between the impeller 11 and the asynchronous speed regulator 12 and adaptively adjusting the transmission ratio of the second transmission 16 according to the current rotation speed of the impeller 11, the output rotation speed of the impeller 11 can be better shifted to an ideal interval of the input rotation speed of the asynchronous speed regulator 12 (the mechanical rotation speed of the outer rotor 121), thereby further reducing the current regulation load of the asynchronous speed regulator 12 and improving the applicability of the asynchronous speed regulator 12.
Example four:
the present embodiment provides a control method of a wind power generation system, which is a control method of a wind power generation system 1 provided in the embodiment of the present invention, and includes the following steps:
step S101: the impeller 11 is driven by wind energy to rotate;
step S102: the impeller 11 drives a driving rotor (for example, an outer rotor 121) of the asynchronous governor 12 to rotate;
step S103: the displacement device 14 adjusts the relative position between the outer rotor 121 and the inner rotor 122 to keep the rotation speed of the driven rotor (e.g., the inner rotor 122) constant;
step S104: the synchronous generator 13 is driven by the driven rotor with constant rotation speed to generate electric energy with constant frequency.
The synchronous generator 13 is electrically connected to the grid to output electric power to the grid, and since the generator 13 can generate a current with a constant frequency, the synchronous generator 13 can be directly connected to the grid without using power electronics such as an inverter. The constant output rotating speed of the asynchronous speed regulator 12 realizes the stable output of the current frequency of the wind power generation system 1, can cope with complex wind conditions, and effectively solves the current grid connection problem caused by complex wind conditions in the transmission wind power generation system 1.
The step S103 specifically includes the following steps:
according to the formula: mechanical speed r of inner rotor3Mechanical speed r of outer rotor 1211+ outer rotor 121 current matched magnetic field rotation speed r2；
When the rotation speed of the active rotor rises, the displacement device 14 adjusts the outer rotor 121 away from the inner rotor 122 so that the coupling area decreases;
when the speed of the active rotor decreases, the displacement device 14 adjusts the outer rotor 121 closer to the inner rotor 122 so that the coupling area increases.
Therefore, the wind power generation system 1 provided by the embodiment of the utility model can cope with complex wind conditions, even if the rotating speed of the impeller 11 changes along with the change of wind power, the controller can keep the output rotating speed constant by regulating and controlling the gear ratio of the asynchronous speed regulator 12, and the synchronous generator 13 is driven by the output shaft of the asynchronous speed regulator 12 to run at a constant speed, so that the output of constant-frequency current can be realized, and the constant-frequency current can be directly connected to the grid.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the utility model.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (8)

1. A wind power generation system having an asynchronous governor, comprising:
the impeller is used for being pushed by wind energy to rotate;
the asynchronous speed regulator comprises an outer rotor, an inner rotor and a displacement device, the outer rotor is sleeved on the inner rotor and is spaced from the inner rotor to form an air gap, a magnetic field is formed in the air gap, the impeller is in transmission connection with one of the outer rotor and the inner rotor to drive the outer rotor and the inner rotor to rotate so as to drive the other one of the outer rotor and the inner rotor to rotate, the displacement device is connected with at least one of the outer rotor and the inner rotor, and the displacement device is used for adjusting the relative position between the outer rotor and the inner rotor along the axial direction so as to change the coupling area between the outer rotor and the inner rotor to enable the rotating speed of the other one of the outer rotor and the inner rotor to be kept constant;
and the other synchronous generator is in transmission connection with the input end of the synchronous generator so as to drive the synchronous generator to stably generate power and output constant-frequency electric energy.
2. The wind power system with an asynchronous governor of claim 1, wherein the outer rotor is a permanent magnet rotor comprising permanent magnets and the inner rotor is a conductor rotor comprising rotor windings.
3. The wind power system with an asynchronous governor of claim 1, wherein the outer rotor is a conductor rotor comprising rotor windings, the inner rotor is a permanent magnet rotor comprising permanent magnets.
4. The wind power generation system with the asynchronous speed regulator according to claim 2 or 3, wherein the impeller is in transmission connection with the outer rotor, and the displacement device is connected with the inner rotor for adjusting the relative position of the inner rotor and the outer rotor along the axial direction of the inner rotor.
5. The wind power system with an asynchronous governor of claim 1, further comprising a speed change device, the impeller being drivingly connected to an input of the speed change device, an output of the speed change device being drivingly connected to the one.
6. Wind power system with asynchronous governor according to claim 5, characterized in that the transmission is a transmission with a fixed transmission ratio or a transmission with an adjustable transmission ratio.
7. Wind power system with asynchronous governor according to claim 5 or 6, characterized in that the gear shifting device is a gear transmission, a hydrodynamic torque converter, a magnetic force transformer or a permanent magnet transmission.
8. The wind power generation system with an asynchronous governor of claim 1, comprising a controller for adjusting the relative position between the outer rotor and the inner rotor so that the rotational speed of the other is constant at a preset value, the controller comprising:
an input rotation speed detection module for detecting a rotation speed of the one;
the operation module is used for calculating an ideal coupling area between the outer rotor and the inner rotor according to the preset value and the rotating speed of the preset value;
the control module is used for regulating and controlling the relative position between the outer rotor and the inner rotor through the displacement device so as to enable the coupling area between the outer rotor and the inner rotor to reach the ideal coupling area.
CN202122808795.7U 2021-11-16 2021-11-16 Wind power generation system with asynchronous speed regulator Active CN216649496U (en)

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