CN217010362U - Stator double-winding type double-fed offshore wind power generation system based on super capacitor - Google Patents
Stator double-winding type double-fed offshore wind power generation system based on super capacitor Download PDFInfo
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- CN217010362U CN217010362U CN202220325457.XU CN202220325457U CN217010362U CN 217010362 U CN217010362 U CN 217010362U CN 202220325457 U CN202220325457 U CN 202220325457U CN 217010362 U CN217010362 U CN 217010362U
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Abstract
The utility model relates to a stator double-winding type double-fed offshore wind power generation system based on a super capacitor, which comprises a stator double-winding type double-fed offshore wind power generator, wherein the stator double-winding type double-fed offshore wind power generator comprises a rotor winding, a first stator winding and a second stator winding, the first stator winding is connected with a power grid through a first switch, the second stator winding is connected with a grid-side converter through a third switch, and the rotor winding is connected with the rotor-side converter; the rotor-side converter is connected with the network-side converter through an intermediate bus, and the intermediate bus is connected with the first super capacitor through a second switch. In the starting process of the power generation system, the super capacitor directly charges the energy for the intermediate bus, the grid-side converter is not required to take the electricity from the power grid to charge the energy for the intermediate bus, and the problem that the stator double-winding double-fed offshore wind driven generator cannot be started due to the fact that the grid-side converter cannot take the electricity can be solved.
Description
Technical Field
The utility model relates to the technical field of offshore wind turbine generators, in particular to a stator double-winding double-fed offshore wind power generation system based on a super capacitor.
Background
The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.
The stator double-winding double-fed fan is provided with two stator windings which are insulated with each other, wherein the output of one stator winding is directly connected with a power grid; and the output of the other stator winding is connected with a grid-side converter, the generated voltage provides alternating current input for the grid-side converter, and then excitation current is input for a motor rotor through a rotor-side converter. The grid-side converter of the stator double-winding double-fed fan is not connected with a power grid, harmonic waves cannot be transmitted into the power grid, and the double-winding double-fed fan is suitable for a large-capacity offshore wind power generation system.
However, the starting process of the existing stator double-winding type double-fed fan has the defects that: when the stator double-winding type double-fed fan is started, energy needs to be obtained from a power grid firstly to charge an intermediate bus, and a grid-side converter is not connected with the power grid, so that the energy cannot be obtained from the power grid; in addition, when the power grid fluctuates or has low voltage, the power generation system is in an isolated power generation state, and the power generation system cannot be started because the grid-side converter cannot obtain required electric energy from the power grid.
SUMMERY OF THE UTILITY MODEL
In order to solve at least one technical problem in the background art, the utility model provides a stator double-winding double-fed offshore wind power generation system based on a super capacitor, wherein the super capacitor is incorporated on a double-converter intermediate bus of the stator double-winding double-fed offshore wind power generation system, so that a grid-side converter does not take electricity from a power grid any more, and the super capacitor can be used for directly charging the intermediate bus so as to realize starting.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the utility model provides a stator double-winding double-fed offshore wind power generation system based on a super capacitor, which comprises a stator double-winding double-fed offshore wind power generator, wherein the stator double-winding double-fed offshore wind power generator comprises a rotor winding, a first stator winding and a second stator winding, the first stator winding is connected with a power grid through a first switch K1, the second stator winding is connected with a grid-side converter through a third switch K3, and the rotor winding is connected with the rotor-side converter;
the rotor-side converter is connected with the grid-side converter through an intermediate bus, and the intermediate bus is connected with the first super capacitor through a second switch K2.
A second supercapacitor connected to the intermediate bus through a fourth switch K4 is also included.
The first super capacitor is connected with a rectifier bridge through a fifth switch K5, and the rectifier bridge is connected with a power grid.
The first stator winding is connected with a power generation transformer through a first switch K1, and the power generation transformer is connected with a power grid.
The crowbar protection device is connected between the rotor winding and the rotor side converter.
The rotor winding is connected with an output shaft of the gear box.
The input shaft of the gear box is connected with the fan blade.
Compared with the prior art, the above one or more technical schemes have the following beneficial effects:
1. in the starting process of the power generation system, the super capacitor directly charges the energy for the intermediate bus, the grid-side converter is not required to take the electricity from the power grid to charge the energy for the intermediate bus, and the problem that the stator double-winding double-fed offshore wind driven generator cannot be started due to the fact that the grid-side converter cannot take the electricity can be solved.
2. The second super capacitor can be connected to the middle bus, the two groups of super capacitors are cascaded to deal with energy storage of the power generation system under the states of power grid fluctuation and low voltage, or a crowbar protection device is connected to a rotor winding loop and consumes electric energy generated by the unit under the state of power grid voltage drop together with the super capacitors, so that the unit is prevented from being disconnected, and the function of low voltage ride through is realized.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model.
FIG. 1 is a schematic structural diagram of an offshore wind power generation system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of an offshore wind power generation system according to a second embodiment of the present invention;
FIG. 3 is a schematic structural diagram of an offshore wind power generation system according to a third embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an offshore wind power generation system according to a fourth embodiment of the present invention;
in the figure: 1. a fan blade; 2. a gear case; 31. a first stator winding; 32. a second stator winding; 4. a rotor winding; 5. a transformer; 6. a dual converter; 7. a first super capacitor; 8. a second super capacitor; 9. a rectifier bridge; 10. crowbar protection device.
Detailed Description
The utility model is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the utility model as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As described in the background art, the starting process of the present stator double-winding double-fed wind turbine has the following defects: when the stator double-winding type double-fed fan is started, energy needs to be obtained from a power grid firstly to charge an intermediate bus, and the grid-side converter is not connected with the power grid, so that energy cannot be obtained from the power grid; in addition, when the power grid fluctuates or has low voltage, the power generation system is in an isolated power generation state, and the power generation system cannot be started because the grid-side converter cannot obtain required electric energy from the power grid.
Therefore, the following embodiment provides a stator double-winding double-fed offshore wind power generation system based on a super capacitor, the super capacitor is connected to a double-converter intermediate bus of the stator double-winding double-fed offshore wind power generation system, a grid-side converter does not take electricity from a power grid, the super capacitor directly charges the intermediate bus to complete the starting of the power generation system, after the starting is completed, electric energy generated by a rotor side prepares for the charging of the super capacitor for the next starting, the super capacitor can charge the super capacitor in a state that the voltage of the power grid is too low or fluctuates through being connected with a rectifier bridge, and the super capacitor can also be connected with a crowbar protection device to consume the electric energy generated during isolated grid power generation together.
The first embodiment is as follows:
as shown in fig. 1, the present embodiment aims to provide a stator double winding type double-fed offshore wind power generation system based on a super capacitor, which includes a stator double winding type double-fed offshore wind power generation unit, where the stator double winding type double-fed offshore wind power generation unit has a first stator winding 31, a second stator winding 32 and a rotor winding 4, the first stator winding 31 is connected to a power grid through a transformer 5, and the second stator winding 32 is connected to the rotor winding 4 through a double converter 6;
the double converters 6 comprise a rotor-side converter and a grid-side converter, which are connected by an intermediate bus.
And a middle bus between the rotor-side converter and the grid-side converter is connected with a super capacitor.
In this embodiment, the first super capacitor 7 is connected to the intermediate bus.
The output shaft of the gear box 2 is connected with the rotor winding 4, and the input shaft is connected with the fan blade 1.
Under the push of wind power, the fan blade 1 rotates to drive the gear box 2 to work, and the rotor winding 4 and the stator winding move relatively to generate electric energy.
The stator double winding type double-fed offshore wind generating set in the embodiment comprises two windings: a first stator winding 31 and a second stator winding 32; the two windings are positioned in the same stator slot and are mutually insulated; wherein, the first stator winding 31 is a main winding, and the output thereof is directly connected with the power grid; the output of the second stator winding 32 is connected to a grid-side converter which generates a voltage that provides an ac input to the grid-side converter and an excitation current to the motor rotor via the rotor-side converter. The grid-side converter of the stator double-winding double-fed fan in the embodiment is not connected with a power grid any more, harmonic waves cannot be transmitted into the power grid, and meanwhile, the manufacturing cost is reduced.
After the power generation system is debugged, the first super capacitor 7 can be charged to a full value through the energy charging interface, and the starting process is as follows: and (3) closing a switch K2, directly charging energy to a middle bus of the double-converter 6 by the first super capacitor 7 until the voltage is stable, starting a rotor-side converter (an AC/DC converter in figure 2), and closing a switch K1 after the voltage coupled from the stator is stable, so that a power generation system is connected to a power grid through a transformer 5 for grid-connected power generation. And finally, closing a switch K3, charging the electric energy through the middle bus in the flow direction of the grid-side converter (at the moment, the power generation system is connected to the grid for power generation, and the power frequency voltage is generated in the second stator winding 32), supplementing the energy to the first super capacitor 7, and disconnecting the switch K2 when the electric energy of the first super capacitor 7 is accumulated to be enough for the next starting, so that the starting process is finished.
In the stator double-winding double-fed offshore wind power generation system, the super capacitor directly charges the energy for the middle bus in the starting process of the power generation system, the grid-side converter is not required to take the electricity from the power grid to charge the energy for the middle bus, and the problem that the generator cannot be started because the grid-side converter cannot take the electricity can be solved.
The second embodiment:
as shown in fig. 2, in this embodiment, based on the first embodiment, the first super capacitor 7 is connected to the transformer 5 by using the rectifier bridge 9, and the transformer 5 is connected to the power grid.
When the power grid voltage fluctuates sharply or the power grid voltage drops instantly, the super capacitor may not be fully charged with energy and thus does not meet the starting requirement, the first super capacitor 7 is connected to the intermediate bus (the switch K2) and the first super capacitor 7 is connected to the transformer 5 through the rectifier bridge 9, the power grid can still generate current even in a fluctuating state, and the rectifier bridge 9 converts alternating current taken from the transformer 5 into direct current to supplement energy for the first super capacitor 7 (realized by the switch K5).
Example three:
as shown in fig. 3, in the present embodiment, a crowbar protection device 10 is interposed between the rotor winding 4 and the rotor-side converter in addition to the first embodiment.
When the voltage of a power grid fluctuates violently and drops instantly, the generator set is required to be incapable of being disconnected within 0.3s, and the electric energy generated by the generator set within the period of time is consumed by adopting a crowbar resistor at present, so that the electric energy generated by the generator set is wasted.
In the implementation, when the grid voltage drop depth is large (generally, when the grid voltage exceeds 40% -80%), the rotor-side converter is locked, and the crowbar protection device 10 and the first super capacitor 7 of the rotor loop are simultaneously put into use, so that the current passing through the excitation converter and the overvoltage of the rotor winding are limited, and the generator is maintained to operate without being disconnected from the grid.
When the voltage of the power grid drops down to a small value (generally 20% -30% of the voltage of the power grid), the crowbar protection device 10 is not put into use, the rotor-side converter is not locked, the rotor-side converter operates normally (reactive output can be increased to support the voltage recovery of the power grid), and only the super capacitor is put into use, so that the super capacitor can absorb redundant motor energy.
Therefore, the electric energy generated by the unit during the voltage fluctuation period is consumed by the crowbar protection device 10 and the first super capacitor 7 together, so that the electric energy waste is avoided, and the low-voltage ride-through function is realized.
Example four:
as shown in fig. 4, in the present embodiment, on the basis of the second embodiment, a second super capacitor 8 connected in parallel with the first super capacitor 7 is connected to the intermediate bus.
When the voltage of a power grid fluctuates severely or the voltage of the power grid drops instantly, the first super capacitor 7 and the second super capacitor 8 form cascade connection, the power grid can still generate current even in a fluctuation state, the rectifier bridge 9 converts alternating current taken from the power grid through the transformer 5 into direct current to supplement energy for the first super capacitor 7, electric energy generated by the power generation system in the power grid fluctuation period is stored by the second super capacitor 8 to play a role of the crowbar protection device in the third embodiment, the first super capacitor 7 can store enough energy for starting the power generation system in the power grid fluctuation and low voltage state, and meanwhile, the electric energy generated by the power generation system in the power grid fluctuation period is absorbed by the second super capacitor 8, so that waste and machine set off-grid are avoided, and a low voltage ride-through function is realized.
At this time, the first super capacitor 7 and the second super capacitor 8 are mutually standby, and both can provide energy for the starting process of the power generation system to charge the intermediate bus.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. Stator double winding formula double-fed offshore wind power generation system based on super capacitor, its characterized in that: the double-winding double-fed offshore wind power generator comprises a stator double-winding double-fed offshore wind power generator, wherein the stator double-winding double-fed offshore wind power generator comprises a rotor winding, a first stator winding and a second stator winding, the first stator winding is connected with a power grid through a first switch, the second stator winding is connected with a grid-side converter through a third switch, and the rotor winding is connected with the rotor-side converter;
the rotor-side converter is connected with the grid-side converter through a middle bus, and the middle bus is connected with the first super capacitor through a second switch.
2. The supercapacitor-based stator double-winding double-fed offshore wind power generation system according to claim 1, wherein: the first super capacitor is connected with a rectifier bridge through a fifth switch, and the rectifier bridge is connected with a power grid.
3. The supercapacitor-based stator double-winding double-fed offshore wind power generation system according to claim 1, wherein: and the second super capacitor is connected with the middle bus through a fourth switch.
4. The supercapacitor-based stator double-winding double-fed offshore wind power generation system according to claim 1, wherein: the first stator winding is connected with a power generation transformer through a first switch, and the power generation transformer is connected with a power grid.
5. The supercapacitor-based stator double-winding double-fed offshore wind power generation system according to claim 1, wherein: the crowbar protection device is connected between the rotor winding and the rotor side converter.
6. The supercapacitor-based stator dual winding doubly-fed offshore wind power generation system of claim 1, wherein: the rotor winding is connected with an output shaft of the gear box.
7. The supercapacitor-based stator double-winding double-fed offshore wind power generation system according to claim 6, wherein: and an input shaft of the gear box is connected with the fan blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220325457.XU CN217010362U (en) | 2022-02-17 | 2022-02-17 | Stator double-winding type double-fed offshore wind power generation system based on super capacitor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220325457.XU CN217010362U (en) | 2022-02-17 | 2022-02-17 | Stator double-winding type double-fed offshore wind power generation system based on super capacitor |
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| Publication Number | Publication Date |
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| CN217010362U true CN217010362U (en) | 2022-07-19 |
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| CN202220325457.XU Active CN217010362U (en) | 2022-02-17 | 2022-02-17 | Stator double-winding type double-fed offshore wind power generation system based on super capacitor |
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| CN (1) | CN217010362U (en) |
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- 2022-02-17 CN CN202220325457.XU patent/CN217010362U/en active Active
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