CN216721145U - Wind power generation system with electromagnetic coupler - Google Patents
Wind power generation system with electromagnetic coupler Download PDFInfo
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- CN216721145U CN216721145U CN202122808902.6U CN202122808902U CN216721145U CN 216721145 U CN216721145 U CN 216721145U CN 202122808902 U CN202122808902 U CN 202122808902U CN 216721145 U CN216721145 U CN 216721145U
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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 electromagnetic coupler, and the wind power generation system comprises an impeller, the electromagnetic coupler, a frequency converter and a synchronous generator. The impeller is used for being pushed by wind energy to rotate, the electromagnetic coupler comprises an outer rotor and an inner rotor, the outer rotor is sleeved with the inner rotor and forms air gaps with the inner rotor at intervals, the impeller is in transmission connection with the outer rotor to drive the outer rotor to rotate, the outer rotor generates a rotating magnetic field to drive the inner rotor to rotate, the frequency converter is connected with the outer rotor to keep the rotating speed of the rotating magnetic field constant, so that the rotating speed of the inner rotor is kept constant, and the inner rotor is connected with the input end of the synchronous generator to drive the synchronous generator to stably generate power and output constant-frequency electric energy.
Description
Technical Field
The utility model relates to the technical field of wind power generation, in particular to a wind power generation system.
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, an embodiment of the utility model proposes a wind power generation system with an electromagnetic coupler.
A wind power generation system according to an embodiment of the present invention includes: the impeller is used for being pushed by wind energy to rotate; the electromagnetic coupler comprises an outer rotor and an inner rotor, the outer rotor is sleeved on the inner rotor and forms an air gap with the inner rotor at intervals, the impeller is in transmission connection with the outer rotor to drive the outer rotor to rotate, the outer rotor generates a rotating magnetic field to drive the inner rotor to rotate, and the frequency converter is connected with the outer rotor and used for keeping the rotating speed of the rotating magnetic field constant, so that the rotating speed of the inner rotor is kept constant; and the inner rotor is connected 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 electromagnetic coupler 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 electromagnetic coupler 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 inner rotor includes an inner rotor core and an inner rotor winding, the outer rotor includes an outer rotor core and an outer rotor winding, and the frequency converter is connected to the outer rotor winding.
In some embodiments, the generator is configured to input the generated electrical energy into a power grid.
In some embodiments, the wind power generation system further comprises a speed changing device, the impeller is in transmission connection with an input end of the speed changing device, and an output end of the speed changing device is in transmission connection with the outer rotor.
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 includes a controller for regulating a current passing through the outer rotor so that a rotating magnetic field of the outer rotor is constant at a preset value, the controller including:
the input rotating speed detection module is used for detecting the mechanical rotating speed of the outer rotor;
the operation module is used for calculating an ideal value of the magnetic field rotating speed matched with the outer rotor current according to the preset value which is the mechanical rotating speed of the outer rotor and the magnetic field rotating speed matched with the outer rotor current;
and the control module is used for regulating and controlling the current introduced into the outer rotor through the frequency converter so as to enable the magnetic field rotating speed matched with the outer rotor current to reach the ideal value.
Drawings
Fig. 1 is a schematic view of a wind power generation system according to a first embodiment of the utility model.
Fig. 2 is a schematic diagram of the structure of the electromagnetic coupler.
FIG. 3 is a schematic view of a wind power system according to a second embodiment of the utility model.
FIG. 4 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 electromagnetic coupler 12; an outer rotor 121; an inner rotor 122; a synchronous generator 13; a frequency converter 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. 1-4. As shown in fig. 1, a wind power generation system 1 according to an embodiment of the present invention includes an impeller 11, an electromagnetic coupler 12, a frequency converter 14, and a synchronous generator 13.
The impeller 11 is driven by wind energy to rotate to generate kinetic energy. The electromagnetic coupler 12 is used for conducting the rotational inertia of the impeller 11 due to the rotation, and driving the synchronous generator 13 to generate and output electric energy.
The electromagnetic coupler 12 includes an outer rotor 121 and an inner rotor 122, the outer rotor 121 is sleeved on the inner rotor 122, and the outer rotor 121 and the inner rotor 122 are spaced apart from each other. The impeller 11 is in transmission connection with the outer rotor 121, the outer rotor 121 generates a rotating magnetic field to drive the inner rotor 122 to rotate, and the frequency converter 14 is connected with the outer rotor 121 so as to keep the rotating speed of the rotating magnetic field constant, so that the rotating speed of the inner rotor 122 can be kept constant.
The inner rotor 122 is connected to the input end of the synchronous generator 13, and since the rotation speed of the inner rotor 122 can be kept constant, the synchronous generator 13 generates power and is connected to the grid, and inputs electric energy with stable frequency into the grid. The ratio of the mechanical rotation speed of the outer rotor 121 to the mechanical rotation speed of the inner rotor 122 can be regarded as the transmission ratio of the electromagnetic coupler 12, and therefore the electromagnetic coupler 12 can be regarded as a variable transmission device.
That is, when the impeller 11 is driven by wind energy to rotate, the outer rotor 121 can be simultaneously driven to rotate, kinetic energy generated by the impeller 11 is input to the electromagnetic coupler 12, the speed of the kinetic energy is changed by the electromagnetic coupler 12, the kinetic energy input from the outer rotor 121 is output by the inner rotor 122, and the rotation speed of the inner rotor 122 is constant. The rotation of the inner rotor 122 can drive the synchronous motor 13 to stably generate power, and the kinetic energy is converted into electric energy.
When the frequency converter 14 inputs alternating current to the outer rotor 121, the outer rotor 121 can generate a rotating magnetic field, and in addition, because the outer rotor 121 rotates, the rotating speed of the rotating magnetic field actually generated by the outer rotor 121 is the superposition of the rotating speed of the rotating magnetic field matched with the current introduced by the frequency converter 14 and the mechanical rotating speed of the outer rotor 121, the inner rotor 122 rotates under the action of the rotating magnetic field, and the rotating speed of the inner rotor 122 is equal to the rotating speed of the magnetic field of the outer rotor 121, so that the transmission of the rotational inertia is realized. According to the difference value between the mechanical rotating speed of the outer rotor 121 and the preset rotating speed of the inner rotor 122, the current led to the outer rotor 121 is changed through the frequency converter 14, the magnetic field rotating speed matched with the current can be changed, the magnetic field rotating speed of the outer rotor 121 is made to be constant, the rotating speed of the inner rotor 122 is made to be constant, and the inner rotor 122 drives the synchronous generator 13 to input the current with stable frequency to a power grid.
That is, the electromagnetic coupler 12 has a function of changing the speed, and the synchronous generator 13 can input a constant-frequency current to the grid by the function of the electromagnetic coupler 12. The synchronous generator 13 stably inputs electric power to the grid without being affected by the variation in the rotational speed of the impeller 11.
According to the wind power generation system provided by the embodiment of the utility model, the electromagnetic coupler 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 electromagnetic coupler 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.
It will be appreciated by those skilled in the art that the rotational speed of the impeller 11 is constantly changing due to wind speed instability, resulting in a constant change in the mechanical rotational speed of the outer rotor 121. Therefore, if the rotation speed of the inner rotor 122 is kept constant, the current applied to the outer rotor 122 can be changed.
Specifically, according to the formula:
rotating field speed r of outer rotor 1210Mechanical speed r of outer rotor 1211+ outer rotor 121 current-matched magnetic field rotation speed r2；
Rotating field speed r of outer rotor 1210Mechanical speed r of the inner rotor 1223。
According to the mechanical speed r of the outer rotor 1211The difference between the ideal mechanical rotation speed of the inner rotor 122 (the ideal rotating magnetic field rotation speed of the outer rotor 121) changes the current frequency transmitted from the frequency converter 14 to the outer rotor 121, so that the outer rotor 121 is current-matched with the magnetic field rotation speed r2Adjusting to finally make the rotating field rotating speed r of the outer rotor 1210Equal to the inner rotor122, etc. of the motor.
If the magnetic field rotation speed r of the outer rotor 121 is maintained03000rpm, then:
1) when the rotation speed of the outer rotor 121 is less than 3000rpm, the current of the outer rotor 121 matches the positive magnetic field rotation speed, i.e., r2Is a positive value;
2) when the rotation speed of the outer rotor 121 is equal to 3000rpm, the rotation speed of the magnetic field of the outer rotor 121 matched with the current is zero, i.e. r2Is 0;
3) when the rotation speed of the outer rotor 121 is greater than 3000rpm, the current of the outer rotor 121 matches the negative magnetic field rotation speed, i.e., r2Are negative values.
In order to make the electromagnetic coupler 12 output a stable rotation speed through the outer rotor current compensation, in some embodiments, the wind turbine generator system 1 further includes a speed changing device connected between the impeller 11 and the electromagnetic coupler 12, the speed changing device having an input end and an output end, the impeller 11 being in transmission connection with the input end of the speed changing device, the output end of the speed changing device being in transmission connection with the outer rotor 121, and the speed changing device being used for speed changing.
That is, the speed change device is used for adjusting the speed of the impeller 11 input to the electromagnetic coupler 12, and the speed change ratio of the speed change device is the ratio of the input end to the output end. The output rotation speed of the impeller 11 can be adapted to the rotation speed application range of the electromagnetic coupler 12 better by the speed change of the speed change device, and the load of the electromagnetic coupler 12 is reduced, that is, the output rotation speed of the impeller 11 can be changed to the ideal interval of the input rotation speed of the electromagnetic coupler 12 (the mechanical rotation speed of the outer rotor 121) by the speed change device.
For example, the ideal interval of the input rotation speed of the electromagnetic coupler 12 is (3000 ± 1000) rpm, and when the input rotation speed of the electromagnetic coupler 12 (the rotation speed of the outer rotor 121) is within the range of (3000 ± 1000) rpm, the electromagnetic coupler 12 can respond more quickly to the rotation speed variation of the outer rotor 121 to keep the magnetic field rotation speed of the outer rotor 121 constant. By providing the transmission having an appropriate gear ratio, the output rotation speed of the impeller 11 can be changed to be within the desired range of the input rotation speed of the electromagnetic coupler 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 converter, a permanent magnet transmission or a magnetic coupling transmission having one or more speed change functions.
It should be noted that the rotation speed of the impeller 11 is generally low. Therefore, the speed changing device can be a speed increasing device, namely the rotating speed of the output end of the speed changing device is larger than the rotating speed of the input end of the speed changing device.
In other embodiments, a transmission may also be connected between the electromagnetic coupler 12 and the synchronous generator 13.
Alternatively, the rotation speed of the inner rotor 122 is 3000rpm, and the synchronous generator 13 can stably input the current with the frequency of 50Hz into the power grid. It should be noted that the national grid frequency reference line is 50Hz, and the output rotation speed of the electromagnetic coupler 12 may be constant at 3000 rpm. The foreign power grid frequency reference line is 60Hz, the output rotating speed of the electromagnetic coupler 12 can be constant at 3600rpm, namely the output rotating speed of the electromagnetic coupler 12 can be adjusted according to the frequency reference of the power grid.
In some embodiments, the wind power generation system 1 includes a controller, the controller is configured to regulate and control a current flowing into the outer rotor 121 so that a rotating magnetic field of the outer rotor 121 is constant at a preset value, and the controller includes an input rotation speed detection module, an operation module, and a control module. The input rotation speed detection module is used for detecting the mechanical rotation speed of the outer rotor 121. The operation module is configured to calculate an ideal value of the magnetic field rotation speed matched with the current of the outer rotor 121 according to a preset value of the rotating magnetic field of the outer rotor 121, which is equal to the mechanical rotation speed of the outer rotor + the magnetic field rotation speed matched with the current of the outer rotor. The control module is used for regulating and controlling the current led into the outer rotor 121 through the frequency converter 14, so that the magnetic field rotating speed matched with the current of the outer rotor 121 reaches an ideal value, the rotating magnetic field of the outer rotor 121 is constant at a preset value, and further the rotating speed of the inner rotor can be kept constant. Here, the preset value of the rotating magnetic field of the outer rotor 121 may be input to the controller in advance.
Several embodiments provided herein are described in detail below with respect to fig. 1-4.
The first embodiment is as follows:
as shown in fig. 1 and 2, the wind power generation system 1 includes an impeller 11, an electromagnetic coupler 12, a synchronous generator 13, and a frequency converter 14. The electromagnetic coupler 12 includes an outer rotor 121 and an inner rotor 122. The impeller 11 is in transmission connection with the outer rotor 121, the inner rotor 122 is in transmission connection with the synchronous generator 13 and drives the synchronous generator 13 to generate power, and the synchronous generator 13 is connected with a power grid through a transformer (not shown in the figure) and supplies power to the power grid.
In the present embodiment, the mechanical rotational speed of the inner rotor 122 is constant at 3000 rpm. The output frequency of the synchronous generator 13 is stabilized at 50 Hz.
Alternatively, the inner rotor 122 includes an inner rotor core and an inner rotor winding, the outer rotor 121 includes an outer rotor core and an outer rotor winding, and the frequency converter 14 is connected to the outer rotor winding.
Example two:
as shown in fig. 3, the wind power generation system 1 includes an impeller 11, an electromagnetic coupler 12, a frequency converter 14, a synchronous generator 13, and a first speed change device 15. The electromagnetic coupler 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 rotation speed of the impeller 11 to the desired rotation speed input section of the electromagnetic coupler 12.
By arranging the first speed changing device 15 between the impeller 11 and the electromagnetic coupler 12, the application range of the rotation speed of the electromagnetic coupler 12 can be better adapted, and the burden of the electromagnetic coupler 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 electromagnetic coupler 12 (the mechanical rotation speed of the outer rotor 121), so that the electromagnetic coupler 12 can better compensate and output a stable rotation speed through the rotor.
Alternatively, the desired interval of the input rotation speed of the electromagnetic coupler 12 is (3000 ± 1000) rpm, and by providing the transmission having an appropriate gear ratio, the output rotation speed of the impeller 11 can be changed to be within the desired interval of the input rotation speed of the electromagnetic coupler 12. When the input rotation speed of the electromagnetic coupler 12 is in the range of (3000 ± 1000) rpm, the electromagnetic coupler 12 can respond more quickly to a change in the mechanical rotation speed of the outer rotor 121 to keep the magnetic field rotation speed of the outer rotor 121 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. 4, the wind power generation system 1 includes an impeller 11, an electromagnetic coupler 12, a frequency converter 14, a synchronous generator 13, and a second speed change device 16. The electromagnetic coupler 12 is similar to the embodiment, and is not described in detail, and only the differences are 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 rotation speed of the impeller 11 to the desired rotation speed input section of the electromagnetic coupler 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 device 16 with an adjustable transmission ratio between the impeller 11 and the electromagnetic coupler 12 and adaptively adjusting the transmission ratio of the second transmission device 16 according to the current rotational speed of the impeller 11, the output rotational speed of the impeller 11 can be better shifted to an ideal range of the input rotational speed of the electromagnetic coupler 12 (the mechanical rotational speed of the outer rotor 121), the current adjustment load of the electromagnetic coupler 12 can be further reduced, and the applicability of the electromagnetic coupler 12 can be improved.
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 the outer rotor 121 of the electromagnetic coupler 12 to rotate;
step S103: the frequency converter 14 changes the current led into the outer rotor 121, so that the rotating magnetic field of the outer rotor 121 is constant at a preset value;
step S104: the synchronous generator 13 is driven by the inner rotor 122 with a constant rotation speed to operate to generate electric energy with a 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 electromagnetic coupler 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: rotating field speed r of outer rotor 1210Mechanical speed r of outer rotor 1211+ outer rotor 121 current-matched magnetic field rotation speed r2；
When r is1When the current is less than the preset value, the frequency converter 14 changes the current led into the outer rotor 121 to make r2Is positive so that r0Equal to the preset value;
when r is1When the current is larger than the preset value, the frequency converter 14 changes the current led into the outer rotor 121 to enable r to be larger than the preset value2Is negative so as to make r0Equal to the preset value.
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 electromagnetic coupler 12, and the synchronous generator 13 is driven by the output shaft of the electromagnetic coupler 12 to operate 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 explicitly specified 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 otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. 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," "example," "specific example," or "some examples" and the like mean that a particular 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 system having an electromagnetic coupler, comprising:
the impeller is used for being pushed by wind energy to rotate;
the electromagnetic coupler comprises an outer rotor and an inner rotor, the outer rotor is sleeved on the inner rotor and forms an air gap with the inner rotor at intervals, the impeller is in transmission connection with the outer rotor to drive the outer rotor to rotate, the outer rotor generates a rotating magnetic field to drive the inner rotor to rotate, and the frequency converter is connected with the outer rotor and used for keeping the rotating speed of the rotating magnetic field constant, so that the rotating speed of the inner rotor is kept constant;
and the inner rotor is connected 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 electromagnetic coupler according to claim 1, wherein the inner rotor includes an inner rotor core and an inner rotor winding, the outer rotor includes an outer rotor core and an outer rotor winding, and the frequency converter is connected to the outer rotor winding.
3. Wind power system with electromagnetic coupling according to claim 1, characterized in that the synchronous generator is adapted to input the generated electrical energy into a power grid.
4. The wind power system with an electromagnetic coupler according to claim 1, further comprising a speed changing device, wherein the impeller is in transmission connection with an input end of the speed changing device, and an output end of the speed changing device is in transmission connection with the outer rotor.
5. Wind power system with electromagnetic coupling according to claim 4, characterized in that the transmission is a transmission with a fixed transmission ratio.
6. Wind power system with electromagnetic coupling according to claim 4, characterized in that the transmission is a transmission with an adjustable transmission ratio.
7. Wind power system with electromagnetic coupling according to any of claims 4 to 6, characterized in that the gear change 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 electromagnetic coupler of claim 1, comprising a controller for regulating the current passing through the outer rotor so as to make the rotating magnetic field of the outer rotor constant at a preset value, the controller comprising:
the input rotating speed detection module is used for detecting the mechanical rotating speed of the outer rotor;
the operation module is used for calculating an ideal value of the magnetic field rotating speed matched with the outer rotor current according to the preset value which is the mechanical rotating speed of the outer rotor and the magnetic field rotating speed matched with the outer rotor current;
and the control module is used for regulating and controlling the current introduced into the outer rotor through the frequency converter so as to enable the magnetic field rotating speed matched with the outer rotor current to reach the ideal value.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114256870A (en) * | 2021-11-16 | 2022-03-29 | 国家电投集团科学技术研究院有限公司 | Wind power generation system and control method of wind power generation system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114256870A (en) * | 2021-11-16 | 2022-03-29 | 国家电投集团科学技术研究院有限公司 | Wind power generation system and control method of wind power generation system |
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