Wind power generation device and wind power generation system
By connecting a permanent magnet generator and a doubly-fed generator in series and using a converter for coordinated control, the problem of low wind energy utilization rate of permanent magnet generators in environments where grid connection is not possible has been solved, achieving efficient conversion of wind energy and stable power supply.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUNGROW POWER SUPPLY CO LTD
- Filing Date
- 2025-05-22
- Publication Date
- 2026-06-09
Smart Images
Figure CN224342930U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of wind power generation technology, and in particular relates to a wind power generation device and a wind power generation system. Background Technology
[0002] In environments such as islands and offshore areas where grid connection is not possible, wind power generation devices typically use permanent magnet generators. However, due to the limitations of their physical characteristics and control strategies, permanent magnet generators have a narrow operating speed range for high efficiency, resulting in low wind energy utilization rates in environments with variable wind speeds. Summary of the Invention
[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a wind power generation device and a wind power generation system, in which the permanent magnet generator uses the electrical energy converted from wind energy to excite the rotor of a doubly-fed generator, and the stator side of the doubly-fed generator outputs a stable voltage to supply the load circuit, thereby realizing the full utilization of wind energy.
[0004] In a first aspect, this application provides a wind power generation device, comprising:
[0005] Wind turbine generators, including permanent magnet generators and doubly fed generators connected in series;
[0006] The first conversion circuit has its first terminal electrically connected to the stator side of the permanent magnet generator and its second terminal electrically connected to the rotor side of the doubly-fed generator.
[0007] The second conversion circuit has its first terminal electrically connected to the stator side of the doubly-fed generator, and its second terminal electrically connected to the load.
[0008] According to one embodiment of this application, the first conversion circuit has a DC bus, and the wind power generation device further includes:
[0009] The third conversion circuit, the first terminal of the third conversion circuit is electrically connected to the DC bus;
[0010] The first energy storage unit is electrically connected to the second terminal of the third conversion circuit.
[0011] According to one embodiment of this application, the first conversion circuit includes:
[0012] The first switch, the first end of the first switch is electrically connected to the stator side of the permanent magnet generator;
[0013] The first AC-DC converter has its AC side electrically connected to the second terminal of the first switch, and its DC side electrically connected to the DC bus.
[0014] The second AC-DC converter is electrically connected to the DC bus on its DC side.
[0015] The second switch has its first terminal electrically connected to the AC side of the second AC-DC converter, and its second terminal electrically connected to the rotor side of the doubly-fed generator.
[0016] According to one embodiment of this application, the third conversion circuit includes:
[0017] The third switch, the first end of the third switch is electrically connected to the DC bus;
[0018] The first bidirectional DC / DC converter has its first terminal electrically connected to the second terminal of the third switch, and its second terminal electrically connected to the first energy storage unit.
[0019] According to one embodiment of this application, the wind power generation device further includes:
[0020] The fourth switch, the first terminal of which is electrically connected to the stator side of the doubly-fed generator;
[0021] The transformer's primary winding is electrically connected to the second terminal of the fourth switch.
[0022] The wind turbine power distribution unit has its input terminal electrically connected to the secondary winding of the transformer, and its output terminal electrically connected to the power supply terminal of the electrical components in the wind power generation device. The wind turbine power distribution unit is configured to convert the voltage output from the secondary winding into a target voltage that is compatible with the operating requirements of the electrical components.
[0023] According to one embodiment of this application, the second conversion circuit includes:
[0024] The fifth switch has its first terminal electrically connected to the stator side of the doubly-fed generator, and its second terminal is used to connect to the AC load.
[0025] According to one embodiment of this application, the second conversion circuit further includes:
[0026] The third AC-DC converter is electrically connected to the second terminal of the fifth switch on its AC side.
[0027] The second bidirectional DC / DC converter has its first terminal electrically connected to the DC side of the third AC-DC converter.
[0028] The sixth switch has its first terminal electrically connected to the second terminal of the second bidirectional DC / DC converter, and its second terminal is used to connect a DC load.
[0029] According to one embodiment of this application, the wind power generation device further includes:
[0030] The second energy storage unit is electrically connected to the second terminal of the second conversion circuit.
[0031] According to one embodiment of this application, the wind turbine generator set further includes:
[0032] The gearbox has its input shaft connected to the rotor shaft of the permanent magnet generator and its output shaft connected to the rotor shaft of the doubly-fed generator.
[0033] The impeller is connected to the rotor shaft of the permanent magnet generator.
[0034] Secondly, this application provides a wind power generation system, including at least one of the aforementioned wind power generation devices.
[0035] According to several embodiments of the wind power generation device and wind power generation system of this application, the stator side of the permanent magnet generator is connected to the rotor side of the doubly-fed generator through a first conversion circuit. In the case of grid connection failure, the permanent magnet generator can use the electrical energy converted from wind energy to excite the rotor of the doubly-fed generator, so that the stator side of the doubly-fed generator outputs a stable voltage to supply the load circuit, thereby realizing the full utilization of wind energy.
[0036] Additional aspects and advantages of this application 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 this application. Attached Figure Description
[0037] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:
[0038] Figure 1 This is a structural block diagram of the wind power generation device provided in the embodiments of this application;
[0039] Figure 2 This is one of the circuit diagrams of the wind power generation device provided in the embodiments of this application;
[0040] Figure 3 This is the second circuit diagram of the wind power generation device provided in the embodiments of this application.
[0041] Figure label:
[0042] Wind turbine 100, permanent magnet generator 110, doubly fed generator 120, gearbox 130, impeller 140, first conversion circuit 200, first AC-DC converter 210, second AC-DC converter 220, second conversion circuit 300, third AC-DC converter 310, second bidirectional DC / DC converter 320, third conversion circuit 400, first bidirectional DC / DC converter 410, first energy storage unit 500, wind turbine power distribution unit 600, second energy storage unit 700, DC bus YC, transformer T, first to sixth switches K1 to K6. Detailed Implementation
[0043] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0044] In the following description, a "circuit" refers to a conductive loop consisting of at least one element or sub-circuit connected by an electrical or electromagnetic link. When an element or circuit is said to be "coupled to" or "connected to" another element, or when an element / circuit is said to be "coupled at" or "connected at" two nodes, it can be directly coupled to or connected to the other element, or there may be intermediate elements. The connection between elements can be physical, logical, or a combination thereof. Conversely, when an element is said to be "directly coupled to" or "directly connected to" another element, it means that there are no intermediate elements between them.
[0045] In the description, the terms "first," "second," etc., are used to distinguish similar objects, not to describe a specific order or sequence. It should be understood that such numerical descriptors can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class, not limited in number; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.
[0046] Furthermore, the use of terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicates that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0047] Traditional wind power systems typically use doubly-fed asynchronous wind turbines or permanent magnet direct-drive wind turbines to convert wind energy into electricity. Doubly-fed turbines can operate over a wide speed range and have high wind energy conversion efficiency at medium to high wind speeds. However, in environments where grid connection is not possible, such as islands or offshore locations, doubly-fed turbines cannot achieve effective excitation and power generation. Therefore, in such environments, permanent magnet generators are usually used. However, permanent magnet generators are limited by their physical characteristics and control strategies, resulting in a narrower efficient operating speed range. This leads to lower wind energy utilization rates in environments with variable wind speeds.
[0048] Reference Figure 1 , Figure 1 The structure of the wind power generation device of this application is shown. One embodiment of this application proposes a wind power generation device, including: a wind turbine 100, a first conversion circuit 200, and a second conversion circuit 300. The wind turbine 100 includes a permanent magnet generator 110 and a doubly-fed generator 120 connected in series; a first terminal of the first conversion circuit 200 is electrically connected to the stator side of the permanent magnet generator 110, and a second terminal of the first conversion circuit 200 is electrically connected to the rotor side of the doubly-fed generator 120; a first terminal of the second conversion circuit 300 is electrically connected to the stator side of the doubly-fed generator 120, and a second terminal of the second conversion circuit 300 is used for electrical connection to a load.
[0049] Under windy conditions, wind energy drives the rotor of the permanent magnet generator 110 to rotate. The permanent magnets on the rotor rotate synchronously with the rotor, forming a dynamic rotating magnetic field. The conductors in the stator windings cut magnetic field lines due to the rotating magnetic field, causing a periodic change in the magnetic flux within the windings. This results in the stator windings of the permanent magnet generator 110 outputting high-frequency alternating current. The permanent magnet generator 110 can output stable excitation power at rated wind speed, meeting the minimum excitation current required for synchronous operation of the doubly-fed generator 120.
[0050] The first conversion circuit 200 is mainly used to convert the electrical energy output by the permanent magnet generator 110 into a form suitable for the rotor excitation of the doubly-fed generator 120. The specific structure of the first conversion circuit 200 can be selected according to the actual application scenario and is not limited here. For example, the first conversion circuit 200 may include an AC-DC-AC converter or a matrix converter, etc.
[0051] The stator-side output power of the permanent magnet generator 110 is rectified into DC by a converter, and then inverted into AC power that matches the rotor frequency of the doubly-fed generator 120, which is then injected into the rotor windings of the doubly-fed generator 120. This converts the mechanical energy of the permanent magnet generator 110 into the rotor excitation energy of the doubly-fed generator 120. By adjusting the switching sequence of the converter, the amplitude, frequency, and phase angle of the current injected into the rotor of the doubly-fed generator 120 can be dynamically adjusted, achieving closed-loop control of the electromagnetic torque and power output of the doubly-fed generator 120.
[0052] The permanent magnet generator 110 and the doubly-fed generator 120 are connected in series. When the stator side of the permanent magnet generator 110 outputs electrical energy to control the normal excitation of the doubly-fed generator 120, the stator side of the doubly-fed generator 120 can output constant voltage and constant frequency electrical energy, and the doubly-fed generator 120 can operate within a wide speed range. The stator side of the doubly-fed generator 120 is electrically connected to the load through the second conversion circuit 300. The wind turbine 100 composed of the permanent magnet generator 110 and the doubly-fed generator 120 can convert wind energy into electrical energy to power the load, thereby realizing the full utilization of wind energy.
[0053] In other embodiments, the first conversion circuit 200 and the second conversion circuit 300 interact via a communication bus to coordinate the rotor excitation and stator output of the doubly fed generator 120, so that the system maintains dynamic stability under conditions such as sudden wind speed changes and load jumps.
[0054] In summary, this application, through the series connection of the permanent magnet generator 110 and the doubly-fed generator 120 and the coordinated control of the converter, enables the wind power generation device to combine the high reliability of the permanent magnet generator 110 and the wide speed adaptability of the doubly-fed generator 120. Wind energy is converted into controllable excitation energy by the permanent magnet generator 110 to drive the doubly-fed generator 120, ultimately outputting constant voltage and constant frequency electrical energy, significantly improving the wind energy utilization rate.
[0055] According to the wind power generation device of this application, the stator side of the permanent magnet generator 110 is connected to the rotor side of the doubly fed generator 120 through the first conversion circuit 200. The permanent magnet generator 110 can use the electrical energy converted from wind energy to excite the rotor of the doubly fed generator 120. The stator side of the doubly fed generator 120 outputs a stable voltage to supply the load circuit, thereby realizing the full utilization of wind energy.
[0056] Reference Figure 2 ,Figure 2 A circuit diagram of the wind power generation device of this application is shown. In some embodiments, the first conversion circuit 200 has a DC bus YC, and the wind power generation device further includes a third conversion circuit 400 and a first energy storage unit 500. A first terminal of the third conversion circuit 400 is electrically connected to the DC bus YC; the first energy storage unit 500 is electrically connected to a second terminal of the third conversion circuit 400.
[0057] The third conversion circuit 400 can convert the electrical energy from the DC bus YC and store it in the first energy storage unit 500, and it can also process the electrical energy stored in the first energy storage unit 500 and transmit it to the DC bus YC. The specific type of the third conversion circuit 400 can be selected according to the actual application scenario, and is not limited here. For example, the third conversion circuit 400 may include a boost circuit or a buck circuit.
[0058] The first energy storage unit 500 can switch between charging and discharging modes according to wind conditions and generator operating status, thus smoothing power fluctuations on the DC bus YC. The specific type of the first energy storage unit 500 can also be selected according to the actual application scenario, and is not limited here. For example, the first energy storage unit 500 may include a battery.
[0059] In some embodiments, the first conversion circuit 200 includes: a first switch K1, a first AC-DC converter 210, a second AC-DC converter 220, and a second switch K2. The first terminal of the first switch K1 is electrically connected to the stator side of the permanent magnet generator 110; the AC side of the first AC-DC converter 210 is electrically connected to the second terminal of the first switch K1, and the DC side of the first AC-DC converter 210 is electrically connected to the DC bus YC; the DC side of the second AC-DC converter 220 is electrically connected to the DC bus YC; the first terminal of the second switch K2 is electrically connected to the AC side of the second AC-DC converter 220, and the second terminal of the second switch K2 is electrically connected to the rotor side of the doubly-fed generator 120.
[0060] The stator side of the permanent magnet generator 110 is connected to the DC bus YC via a first switch K1 and a first AC-DC converter 210. The first switch K1 can be switched between on and off modes. When the first switch K1 is on, the electrical energy output from the stator side of the permanent magnet generator 110 can be converted by the first AC-DC converter 210 and transmitted to the DC bus YC. The DC bus YC is connected to the rotor side of the doubly-fed generator 120 via a second switch K2 and a second AC-DC converter 220. The second switch K2 can be switched between on and off modes. When the second switch K2 is on, the electrical energy on the DC bus YC can be converted by the second AC-DC converter 220 and transmitted to the rotor side of the doubly-fed generator 120 to control the rotor excitation of the doubly-fed generator 120.
[0061] The specific types of the first switch K1 and the second switch K2 can be selected according to the actual application scenario, and are not limited here. For example, the first switch K1 and the second switch K2 can be contactors or relays, etc.
[0062] The first AC-DC converter 210 is mainly used to convert the AC power output from the stator side of the permanent magnet generator 110 into DC power and then transmit it to the DC bus YC. The second AC-DC converter 220 is used to convert the DC power from the DC bus YC into AC power and then transmit it to the power grid. The specific structure and working principle of the AC-DC converter are based on mature technologies and will not be elaborated here.
[0063] In some embodiments, the third conversion circuit 400 includes a third switch K3 and a first bidirectional DC / DC converter 410. The first terminal of the third switch K3 is electrically connected to the DC bus YC; the first terminal of the first bidirectional DC / DC converter 410 is electrically connected to the second terminal of the third switch K3, and the second terminal of the first bidirectional DC / DC converter 410 is electrically connected to the first energy storage unit 500.
[0064] The third switch K3 can switch between two operating modes: on and off. When the third switch K3 is on, energy can be transferred between the energy storage unit and the DC bus YC.
[0065] The first bidirectional DC / DC converter 410 can convert electrical energy on the DC bus YC and store it in the energy storage unit, and it can also process the electrical energy stored in the energy storage unit and transmit it back to the DC bus YC. The specific type of the first bidirectional DC / DC converter 410 can be selected according to the actual application scenario and is not limited here. For example, the first bidirectional DC / DC converter 410 may include a boost circuit or a buck circuit.
[0066] It should be noted that during the operation of the wind power generation device, the states of the first switch K1, the second switch K2, and the third switch K3 can be controlled according to the wind conditions and the status of the energy storage unit to achieve switching between different modes. The specific operating modes are as follows:
[0067] When the first switch K1 and the second switch K2 are turned on and the third switch K3 is turned off, the electrical energy output from the stator side of the permanent magnet generator 110 is transmitted sequentially through the first AC-DC converter 210 and the second AC-DC converter 220 to the rotor side of the doubly-fed generator 120 to control the rotor excitation of the doubly-fed generator 120, so that the stator side of the doubly-fed generator 120 outputs constant voltage and constant frequency electrical energy to supply power to the load.
[0068] When the first switch K1, the second switch K2, and the third switch K3 are all turned on, the first energy storage unit 500 is connected to the DC bus YC through the first bidirectional DC / DC converter 410. The first energy storage unit 500 can store part of the electrical energy on the DC bus YC when the wind conditions are good (the permanent magnet generator 110 outputs more electrical energy), and can also transfer the stored electrical energy to the DC bus YC when the wind conditions are poor, so as to maintain the rotor excitation of the doubly-fed generator 120.
[0069] It should be noted that the operating modes of the wind power generation devices listed above are merely illustrative and not an exhaustive list of the proposed solutions. Any modifications, equivalent substitutions, improvements, or variations made within the spirit and principles of this invention, as well as any other reasonable implementation modes, should be included within the scope of protection of this invention.
[0070] Reference Figure 3 , Figure 3 A circuit diagram of the wind power generation device of this application is shown. In some embodiments, the wind power generation device further includes: a fourth switch K4, a transformer T, and a wind turbine power distribution unit 600. The first terminal of the fourth switch K4 is electrically connected to the stator side of the doubly-fed generator 120; the primary winding of the transformer T is electrically connected to the second terminal of the fourth switch K4; the input terminal of the wind turbine power distribution unit 600 is electrically connected to the secondary winding of the transformer T, and the output terminal of the wind turbine power distribution unit 600 is electrically connected to the power supply terminal of the electrical components in the wind power generation device. The wind turbine power distribution unit 600 is configured to convert the voltage of the secondary winding into a target voltage adapted to the operating requirements of the electrical components.
[0071] The fourth switch K4 is electrically connected between the stator side of the doubly-fed generator 120 and the high-voltage side of the transformer T, mainly used to control the circuit switching. When the fourth switch K4 is closed, the electrical energy output from the stator side can be transmitted to the transformer T, forming a complete current loop. In equipment maintenance, troubleshooting, or emergency situations, the fourth switch K4 can be controlled to open, quickly cutting off the circuit to isolate the fault point, preventing current backflow or short circuit from damaging the system, and ensuring the safety of personnel and equipment.
[0072] Transformer T is mainly used to convert the high-voltage AC output from the stator side of the doubly fed generator 120 into AC that is suitable for conversion by the wind turbine power distribution unit 600.
[0073] The wind turbine power distribution unit 600 is mainly used to convert and distribute electrical energy in the wind power generation device. Its input terminal is connected to the voltage output from the low-voltage side of transformer T, further converting the low-voltage electricity output from transformer T into the target voltage required by the electrical devices. The electrical energy at the output terminal of the wind turbine power distribution unit 600 supplies power to the electrical devices within the wind power generation device. For example, the wind turbine power distribution unit 600 can provide 24 volts DC power to the control module of the wind power generation device through its internally integrated DC-DC converter.
[0074] In some embodiments, the second conversion circuit 300 includes a fifth switch K5. The first terminal of the fifth switch K5 is electrically connected to the stator side of the doubly-fed generator 120, and the second terminal of the fifth switch K5 is used to connect an AC load.
[0075] The fifth switch K5 can be switched between on and off states to control the connection or disconnection of the energy transmission path between the stator side of the doubly-fed generator 120 and the AC load. When the fifth switch K5 is on, the AC power output from the stator side of the doubly-fed generator 120 can be smoothly transmitted to the AC load, supplying power to the AC load. The AC load can be determined according to the actual application scenario and is not limited here. For example, the AC load may include a hydrogen production system.
[0076] In some embodiments, the second conversion circuit 300 further includes a third AC-DC converter 310, a second bidirectional DC / DC converter 320, and a sixth switch K6. The AC side of the third AC-DC converter 310 is electrically connected to the second terminal of the fifth switch K5; the first terminal of the second bidirectional DC / DC converter 320 is electrically connected to the DC side of the third AC-DC converter 310; the first terminal of the sixth switch K6 is electrically connected to the second terminal of the second bidirectional DC / DC converter 320, and the second terminal of the sixth switch K6 is used to connect a DC load.
[0077] The third AC-DC converter 310 can convert the AC power output from the stator side of the doubly-fed generator 120 into DC power output.
[0078] The second bidirectional DC / DC converter 320 is electrically connected to the output terminal of the third AC-DC converter 310. It is mainly used to boost or buck the DC power output by the third AC-DC converter 310 to convert the DC power output by the third AC-DC converter 310 into DC power that is compatible with the working requirements of the DC load.
[0079] The sixth switch K6 can be switched between on and off states to control the connection or disconnection of the energy transfer path between the second bidirectional DC / DC converter 320 and the AC load. When the sixth switch K6 is on, the DC power output from the second bidirectional DC / DC converter 320 can be smoothly transferred to the DC load to power it.
[0080] The DC load can be determined based on the actual application scenario, and there is no limitation here. For example, the DC load may include DC motors, thereby realizing flexible distribution and efficient utilization of electrical energy.
[0081] In some embodiments, the wind power generation device further includes a second energy storage unit 700. The second energy storage unit 700 is electrically connected to the second terminal of the second conversion circuit 300.
[0082] The second energy storage unit 700 is connected to the stator side of the doubly-fed generator 120 via the second conversion circuit 300. The second energy storage unit 700 can store the electrical energy output from the stator side of the doubly-fed generator 120. When wind conditions are favorable, the stator side output power of the doubly-fed generator 120 may exceed the rated power of the load. In this case, a portion of the electrical energy output from the stator side of the doubly-fed generator 120 can be stored in the second energy storage unit 700, improving energy utilization.
[0083] The specific type of the second energy storage unit 700 can also be selected according to the actual application scenario, and there is no limitation here. For example, the second energy storage unit 700 may include a battery.
[0084] In some embodiments, the wind turbine 100 further includes a gearbox 130 and an impeller 140. The input shaft of the gearbox 130 is connected to the rotor shaft of the permanent magnet generator 110, and the output shaft of the gearbox 130 is connected to the rotor shaft of the doubly-fed generator 120; the impeller 140 is connected to the rotor shaft of the permanent magnet generator 110.
[0085] The impeller 140 is connected to the rotor shaft of the permanent magnet generator 110, mainly used to capture wind energy and convert it into mechanical energy to drive the rotor of the permanent magnet generator 110 to rotate, thereby generating electrical energy. The input shaft of the gearbox 130 is connected to the rotor shaft of the permanent magnet generator 110, and the output shaft is connected to the rotor shaft of the doubly-fed generator 120. This can transmit torque, enabling the permanent magnet generator 110 and the doubly-fed generator 120 to perform energy conversion simultaneously with only one impeller 140 structure, saving space, and coordinating the speed of the two generators so that they can operate at their optimal efficiency point under different wind speeds.
[0086] One embodiment of this application proposes a wind power generation system, including at least one of the aforementioned wind power generation devices.
[0087] The specific structure and working principle of the wind power generation device can be referred to the aforementioned embodiments, and will not be repeated here.
[0088] According to the wind power generation system of this application, the stator side of the permanent magnet generator 110 is connected to the rotor side of the doubly fed generator 120 through the first conversion circuit 200. The permanent magnet generator 110 uses the electrical energy converted from wind energy to excite the rotor of the doubly fed generator 120. The stator side of the doubly fed generator 120 outputs a stable voltage to supply the load circuit, thereby realizing the full utilization of wind energy.
[0089] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.
Claims
1. A wind power generation device, characterized in that, include: A wind turbine generator includes a permanent magnet generator and a doubly-fed generator, wherein the rotor shaft of the permanent magnet generator is connected in series with the rotor shaft of the doubly-fed generator. A first conversion circuit, wherein a first terminal of the first conversion circuit is electrically connected to the stator side of the permanent magnet generator, and a second terminal of the first conversion circuit is electrically connected to the rotor side of the doubly fed generator; The second conversion circuit has a first terminal electrically connected to the stator side of the doubly fed generator, and a second terminal electrically connected to the load.
2. The wind power generation device according to claim 1, characterized in that, The first conversion circuit has a DC bus, and the wind power generation device further includes: The third conversion circuit, wherein the first terminal of the third conversion circuit is electrically connected to the DC bus; The first energy storage unit is electrically connected to the second terminal of the third conversion circuit.
3. The wind power generation device according to claim 2, characterized in that, The first conversion circuit includes: A first switch, the first end of which is electrically connected to the stator side of the permanent magnet generator; The first AC-DC converter has its AC side electrically connected to the second terminal of the first switch, and its DC side electrically connected to the DC bus. The second AC-DC converter has its DC side electrically connected to the DC bus. The second switch has its first terminal electrically connected to the AC side of the second AC-DC converter and its second terminal electrically connected to the rotor side of the doubly-fed generator.
4. The wind power generation device according to claim 2, characterized in that, The third conversion circuit includes: The third switch, the first end of which is electrically connected to the DC bus; A first bidirectional DC / DC converter, wherein a first terminal of the first bidirectional DC / DC converter is electrically connected to a second terminal of the third switch, and a second terminal of the first bidirectional DC / DC converter is electrically connected to the first energy storage unit.
5. The wind power generation device according to any one of claims 1-4, characterized in that, The wind power generation device also includes: The fourth switch, the first end of which is electrically connected to the stator side of the doubly-fed generator; A transformer, wherein the primary winding of the transformer is electrically connected to the second terminal of the fourth switch; The wind turbine power distribution unit has its input terminal electrically connected to the secondary winding of the transformer and its output terminal electrically connected to the power supply terminal of the electrical components in the wind power generation device. The wind turbine power distribution unit is configured to convert the voltage output from the secondary winding into a target voltage that is compatible with the operating requirements of the electrical components.
6. The wind power generation device according to any one of claims 1-4, characterized in that, The second conversion circuit includes: The fifth switch has its first end electrically connected to the stator side of the doubly-fed generator, and its second end is used to connect an AC load.
7. The wind power generation device according to claim 6, characterized in that, The second conversion circuit further includes: The third AC-DC converter, wherein the AC side of the third AC-DC converter is electrically connected to the second terminal of the fifth switch; The second bidirectional DC / DC converter has its first terminal electrically connected to the DC side of the third AC-DC converter. The sixth switch has its first terminal electrically connected to the second terminal of the second bidirectional DC / DC converter, and its second terminal is used to connect a DC load.
8. The wind power generation device according to any one of claims 1-4, characterized in that, The wind power generation device also includes: The second energy storage unit is electrically connected to the second terminal of the second conversion circuit.
9. The wind power generation device according to any one of claims 1-4, characterized in that, The wind turbine also includes: A gearbox, wherein the input shaft of the gearbox is connected to the rotor shaft of the permanent magnet generator, and the output shaft of the gearbox is connected to the rotor shaft of the doubly fed generator; The impeller is connected to the rotor shaft of the permanent magnet generator.
10. A wind power generation system, characterized in that, It includes at least one wind power generation device according to any one of claims 1-9.