Control Method, Control Device, Wind Turbine Generator Set and Blade

Abstract

The present invention relates to a control method, a control device, a wind turbine generator set, and a blade. The control method is used for a wind turbine generator set, which includes a blade. The blade includes a blade body and a wind guiding component at least partially connected to the blade body. The wind guiding component can jet gas from the side where the leeward surface of the blade body is located to the outside of the blade body. The control method includes: obtaining the wind speed of the current ambient wind; when the wind speed of the ambient wind falls within a first preset interval, controlling the wind guiding component to jet air flow in a predetermined direction from the side where the leeward surface is located to adjust the flow velocity of the air flow flowing through the leeward surface. The control method, the control device, the wind turbine generator set, and the blade provided by the embodiments of the present invention can improve the power corresponding to the specified wind speed in the optimal wind power capture stage of the wind turbine generator set and / or expand the wind speed interval corresponding to the rated power in the full-load stage, thereby improving the wind energy utilization rate of the wind turbine generator set and ensuring the power generation benefit.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular, to a control method, a control device, a wind turbine generator set, and a blade. Background Art

[0002] A wind turbine generator set captures wind energy through an impeller composed of multiple blades to obtain mechanical energy and converts it into electrical energy and incorporates it into the power grid. The blade is the first execution component for wind energy conversion, and can convert the kinetic energy of the wind into the rotational motion of the impeller.

[0003] For existing wind turbine generator sets, their power generation process includes an optimal wind power capture stage and a full-load stage. Due to the limitations of the control method for wind turbine generator sets during the power generation process, there is a problem of low wind energy utilization rate in these two stages as a whole, which affects their power generation efficiency. Summary of the Invention

[0004] Embodiments of the present invention provide a control method, a control device, a wind turbine generator set, and a blade. The control method can increase the power corresponding to the specified wind speed in the optimal wind power capture stage of the wind turbine generator set and / or expand the wind speed range corresponding to the rated power in the full-load stage, thereby improving the wind energy utilization rate of the wind turbine generator set and ensuring the power generation efficiency.

[0005] On the one hand, according to an embodiment of the present invention, a control method for a wind turbine generator set is proposed. The wind turbine generator set includes a blade, and the blade includes a blade body and at least a part of a wind guiding component connected to the blade body. The wind guiding component can jet gas from the side where the leeward surface of the blade body is located to the outside of the blade body. The control method includes:

[0006] Obtain the wind speed of the current ambient wind;

[0007] When the wind speed of the ambient wind falls within a first preset interval, control the wind guiding component to jet air flow from the side where the leeward surface is located to a predetermined direction to adjust the flow velocity of the air flow flowing through the leeward surface.

[0008] According to one aspect of the embodiment of the present invention, when the wind speed falls within the first preset interval, controlling the wind guiding component to jet air flow from the side where the leeward surface is located to a predetermined direction to adjust the flow velocity of the air flow flowing through the leeward surface includes:

[0009] When the first preset interval includes the range from the value of the cut-in wind speed during the operation of the wind turbine generator set to the first value, control the wind guiding component to jet air flow from the side where the leeward surface is located to the direction of the trailing edge of the blade body to increase the flow velocity of the air flow flowing through the leeward surface, so that the value of the rated wind speed during the full-load operation of the wind turbine generator set is reduced from the initial value to the first value.

[0010] According to one aspect of an embodiment of the present invention, when the wind speed falls within a first preset range, the step of controlling the air guiding component to eject air flow from the side where the leeward surface is located to a predetermined direction to adjust the flow rate of the air flow passing through the leeward surface includes:

[0011] When the first preset range includes a range from a second value to a third value, the air guiding component is controlled to eject air flow from the side where the leeward surface is located to the direction where the leading edge of the blade is located, so as to reduce the flow rate of the air flow passing through the leeward surface, and the value of the cut-out wind speed when the wind turbine generator operates at the full-load stage is increased from an initial value to the third value, wherein the second value is less than or equal to the initial value of the rated wind speed when the wind turbine generator operates at the full-load stage.

[0012] According to one aspect of an embodiment of the present invention, when an air guiding component is provided at the leading edge position of the blade body of the wind turbine generator, the second value is equal to the initial value of the rated wind speed;

[0013] When air guiding components are provided at both the leading edge position and the trailing edge position of the blade body of the wind turbine generator, the second value is less than the initial value of the rated wind speed and greater than or equal to the value adjusted and reduced under the action of the air guiding component at the trailing edge position of the rated wind speed.

[0014] According to one aspect of an embodiment of the present invention, the control method further includes that when the wind speed of the ambient wind does not fall within the first preset range, the air guiding component is closed.

[0015] In another aspect, according to an embodiment of the present invention, a control device for a wind turbine generator is provided. The wind turbine generator includes blades, and the blades include blade bodies and at least part of the air guiding components connected to the blade bodies. The air guiding components can eject gas from the side where the leeward surface of the blade body is located. The control device is characterized in that it includes:

[0016] An acquisition module for acquiring the wind speed of the current ambient wind;

[0017] A control module for controlling the air guiding component to eject air flow from the side where the leeward surface is located to a predetermined direction to adjust the flow rate of the air flow passing through the leeward surface when the wind speed of the ambient wind falls within the first preset range.

[0018] In another aspect, a wind turbine generator set according to an embodiment of the present invention includes: an impeller, including a hub and blades connected to each other, with more than two blades spaced apart around the central axis of the hub, and each blade including a blade body and at least a part of a wind guiding component connected to the blade, the wind guiding component being capable of jetting gas from the side where the leeward surface of the blade body is located; a air supply component, connected to the wind guiding component and used for supplying air flow to the wind guiding component; a controller, used for obtaining the wind speed of the current ambient wind of the wind turbine generator set, and when the wind speed of the ambient wind falls within a first preset range, controlling the wind guiding component to jet air flow from the side where the leeward surface is located to a predetermined direction, so as to adjust the flow rate of the air flow passing through the leeward surface of the blade.

[0019] In another aspect according to the embodiment of the present invention, a wind guiding component is provided on at least one of the side where the leeward surface of the blade body is located and at the leading edge position and the trailing edge position of the blade body.

[0020] In another aspect according to the embodiment of the present invention, a wind guiding component is provided on the side where the leeward surface of the blade body is located and at the trailing edge position, and the controller is used for: when the first preset range includes the range from the cut-in wind speed value during the operation of the wind turbine generator set to the first value, controlling the wind guiding component to jet air flow from the side where the leeward surface is located to the direction where the trailing edge of the blade body is located, so as to increase the flow rate of the air flow passing through the leeward surface, and making the value of the rated wind speed during the full-load operation stage of the wind turbine generator set decrease from the initial value to the first value.

[0021] In another aspect according to the embodiment of the present invention, a wind guiding component is provided on the side where the leeward surface of the blade body is located and at the leading edge position, and the controller is used for when the first preset range includes the range from the second value to the third value, controlling the wind guiding component to jet air flow from the side where the leeward surface is located to the direction where the leading edge of the blade is located, so as to decrease the flow rate of the air flow passing through the leeward surface, and making the value of the cut-out wind speed during the full-load operation stage of the wind turbine generator set increase from the initial value to the third value, where the second value is less than or equal to the initial value of the rated wind speed during the full-load operation stage of the wind turbine generator set.

[0022] In another aspect according to the embodiment of the present invention, the wind guiding component includes a wind guiding pipe and a flow control module, the wind guiding pipe is connected to the blade body, the wind guiding pipe has an inner cavity and an air port communicating with the inner cavity, the flow control module is connected between the wind guiding pipe and the air supply component and adjusts the flow rate of the air flow sent into the wind guiding pipe by the air supply component, and the controller is electrically connected to the flow control module.

[0023] According to another aspect of the embodiments of the present invention, the air guide duct includes a first air guiding section and a second air guiding section that are interconnected. The first air guiding section and the second air guiding section are successively distributed along the axial direction of the blade body. The first air guiding section is disposed inside the blade body and the second air guiding section is disposed outside the blade body. The air port is disposed on the second air guiding section, and the first air guiding section is connected to the air supply component through a flow control module.

[0024] According to another aspect of the embodiments of the present invention, the air guide duct is integrally disposed inside the blade body and extends along the axial direction of the blade body. An outlet that is oppositely disposed and interconnected with the air port is provided on the blade body.

[0025] According to another aspect of the embodiments of the present invention, air guiding components are provided at both the leading edge position and the trailing edge position. The air port of the air guide duct at the leading edge position is inclined at a predetermined angle toward the side where the leading edge is located, and the air port of the air guide duct at the trailing edge position is inclined at a predetermined angle toward the side where the trailing edge is located; and / or, the number of air guide ducts included in the air guiding component is more than two, and the more than two air guide ducts are spaced apart in the chord direction of the blade body, and each air guide duct is correspondingly connected to a flow control module.

[0026] According to another aspect of the embodiments of the present invention, the air supply component is connected to at least one of the hub and the blade root.

[0027] According to another aspect of the embodiments of the present invention, the air supply component includes a wind collecting hood and a connecting pipeline connecting the wind collecting hood and the air guiding component. The wind collecting hood is connected to the hub and can guide at least part of the ambient wind to the air guiding component through the connecting pipeline.

[0028] According to another aspect of the embodiments of the present invention, the wind collecting hood is connected to one end of the hub in the extending direction of the central axis, and the orthographic projection of the wind collecting hood in the extending direction covers the hub and at least part of the blade root.

[0029] According to another aspect of the embodiments of the present invention, the wind collecting hood includes a connecting housing and an air inlet housing. The connecting housing and the air inlet housing are butt-jointed with each other and enclose to form a wind cavity. The connecting housing is inserted into the inside of the hub and has an air outlet that is communicated with the connecting pipeline and the wind cavity. The air inlet housing is located on the side of the connecting housing away from the hub and has a plurality of air inlets that are communicated with the wind cavity.

[0030] In another aspect, according to the embodiments of the present invention, a blade is provided, including: a blade body having a leeward surface; an air guiding component at least partially connected to the blade body and capable of jetting gas from the side where the leeward surface is located to the outside of the blade body to adjust the flow velocity of the air flowing through the leeward surface; wherein, air guiding components are respectively provided at the leading edge position and the trailing edge position of the blade body on the side where the leeward surface is located.

[0031] According to another aspect of the embodiments of the present invention, the air guiding component includes an air guiding pipe, which comprises a first guiding section and a second guiding section that are in communication with each other. The first guiding section and the second guiding section are successively distributed along the axial direction of the blade body. The first guiding section is arranged inside the blade body and the second guiding section is arranged outside the blade body. An air port is provided on the second guiding section.

[0032] According to the control method, control device, wind turbine generator set and blade provided by the embodiments of the present invention, the control method can obtain the wind speed of the current ambient wind, and when the wind speed of the ambient wind falls within a first preset range, control the air guiding component to eject air flow from the side where the leeward surface is located to a predetermined direction, so as to adjust the flow rate of the air flow flowing through the leeward surface. By adjusting the flow rate of the air flow flowing through the leeward surface, the pressure difference between the leeward surface and the windward surface of the blade can be adjusted, and further the lift force that drives the impeller of the wind turbine generator set to rotate can be adjusted, so that part of the wind conditions below the initial value of the rated wind speed and / or above the cut-out wind speed during the power generation process in the ambient wind can be utilized, the power corresponding to the specified wind speed in the optimal wind power capture stage of the wind turbine generator set can be increased and / or the wind speed range corresponding to the rated power in the full-load stage can be expanded, thereby improving the wind energy utilization rate of the wind turbine generator set and ensuring the power generation benefit. Brief Description of the Drawings

[0033] The features, advantages and technical effects of the exemplary embodiments of the present invention will be described below with reference to the drawings.

[0034] Figure 1 is a schematic structural diagram of a wind turbine generator set according to an embodiment of the present invention;

[0035] Figure 2 is a schematic diagram showing the relationship between the operating power and the wind speed of a wind turbine generator set in the prior art;

[0036] Figure 3 is a schematic structural diagram of a blade according to an embodiment of the present invention;

[0037] Figure 4 is a cross-sectional view of a blade according to an embodiment of the present invention;

[0038] Figure 5 is a schematic structural diagram of a blade according to another embodiment of the present invention;

[0039] Figure 6 is a cross-sectional view of a blade according to another embodiment of the present invention;

[0040] Figure 7 is a schematic structural diagram of a blade according to still another embodiment of the present invention;

[0041] Figure 8 is a cross-sectional view of a blade according to still another embodiment of the present invention;

[0042] Figure 9 is a side view of an air guide duct according to an embodiment of the present invention;

[0043] Figure 10 is a cross-sectional view of the cooperation between the air guide duct and the leeward surface according to one embodiment of the present invention;

[0044] Figure 11 is a cross-sectional view of the cooperation between the air guide duct and the leeward surface of another embodiment of the present invention;

[0045] Figure 12 is a schematic structural diagram of a blade according to another embodiment of the present invention;

[0046] Figure 13 is a cross-sectional view of a blade according to yet another embodiment of the present invention;

[0047] Figure 14 is a schematic structural diagram of a blade according to another embodiment of the present invention;

[0048] Figure 15 is a cross-sectional view of a blade according to another embodiment of the present invention;

[0049] Figure 16 is a partial structural schematic diagram of a wind turbine generator set according to an embodiment of the present invention;

[0050] Figure 17 is a flow chart of a control method for a wind turbine generator set according to an embodiment of the present invention;

[0051] Figure 18 is a schematic diagram of the relationship between the operating power and wind speed of a wind turbine generator set according to an embodiment of the present invention;

[0052] Figure 19 It is a schematic structural diagram of a control device for a wind turbine generator set according to an embodiment of the present invention.

[0053] in:

[0054] 100-impeller;

[0055] 10-blade; 11-blade body; 111-windward side; 112-leeward side; 113-leading edge; 114-trailing edge; 12-air guide component; 121-air guide pipe; 121a-first guide section; 121b-second guide section; 121c-air port; 122-flow control module;

[0056] 20-wheel hub;

[0057] 200-air supply component; 210-air collecting cover; 211-connecting cover; 211a-plug-in section; 211b-disc-shaped base; 211c-air outlet; 212-air inlet cover; 212a-air inlet; 213-control valve; 220-transfer pipe;

[0058] 300 - Controller; 400 - Tower; 500 - Nacelle; 600 - Generator;

[0059] X - Axial direction; Y - Chordwise direction.

[0060] In the drawings, like parts are designated by like reference numerals. The drawings are not drawn to scale. Detailed Description of the Invention

[0061] The features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is only intended to provide a better understanding of the present invention by way of example. In the drawings and the following description, at least some of the well - known structures and techniques are not shown in order to avoid unnecessarily obscuring the present invention; and, for clarity, the dimensions of some structures may be exaggerated. In addition, the features, structures, or characteristics described below may be combined in any suitable manner in one or more embodiments.

[0062] The directional terms appearing in the following description are the directions shown in the drawings and do not limit the specific structures of the control method, control device, wind turbine generator set, and blade of the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly defined and limited, the terms "mounted" and "connected" should be understood in a broad sense. For example, they can be fixedly connected, detachably connected, or integrally connected; they can be directly connected or indirectly connected. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0063] For a better understanding of the present invention, the following is combined with Figures 1 to 19 The control method, control device, wind turbine generator set, and blade according to the embodiments of the present invention are described in detail.

[0064] Please refer to Figure 1, the wind turbine provided by the embodiment of the present invention includes a tower 400, a nacelle 500, a generator 600, and an impeller 100. The nacelle 500 is arranged at the top of the tower 400, and the generator 600 is arranged in the nacelle 500, which can be located inside the nacelle 500, and of course can also be located outside the nacelle 500. The impeller 100 includes a hub 20 and more than two blades 10 connected to the hub 20. The more than two blades 10 are spaced apart around the central axis of the hub 20. The impeller 100 is connected to the rotor of the generator 600 through its hub 20. When the wind acts on the blades 10, it drives the hub 20 and the rotor of the generator 600 to rotate relative to the stator, thereby meeting the power generation requirements of the wind turbine.

[0065] As Figure 2 shown, in the process of converting wind energy into electrical energy in the existing wind turbines, there are mainly three wind speed nodes with increasing requirements for wind speed, which are the cut-in wind speed V 切入 , the rated wind speed V 额定 and the cut-out wind speed V 切出 .

[0066] The so-called cut-in wind speed V 切入 refers to the cut-in speed at which the wind speed reaches the operable state of the wind turbine, enabling it to start and convert wind energy into electrical energy. The so-called rated wind speed V 额定 is the minimum wind speed required for the ambient wind when the wind turbine enters the full-load stage. The so-called cut-out wind speed V 切出 is the maximum wind speed required for the ambient wind when the wind turbine is in the full-load stage. When the wind speed exceeds this speed, the wind turbine will pitch to stop. The initial values of the cut-in wind speed V 切入、 the rated wind speed V 额定 and the cut-out wind speed V 切出 are all known values preset according to the model of the wind turbine.

[0067] When the wind turbine is operating, in the stage from the cut-in wind speed V 切入 to the rated wind speed V 额定 , which can also be called the optimal wind power capture stage, the blades 10 are at the maximum pitch angle. The wind turbine controls the impeller 100 to operate at the speed corresponding to the optimal tip speed ratio by adjusting the magnitude of the electromagnetic torque of the generator 600 to track the maximum power corresponding to each specified wind speed. In the stage between the rated wind speed V 额定 and the cut-out wind speed V 切出 , which can also be called the full-load stage, that is, by adjusting the pitch angle of the blades 10 and the magnitude of the electromagnetic torque, it is ensured that the impeller 100 operates at the rated speed of the generator 600 to generate the corresponding rated power. When the wind speed exceeds the cut-out wind speed V 切出When the wind speed drops below the cut-in wind speed, the wind turbine directly shuts down by fully feathering the blades and waits for the wind speed to recover to a value between the rated wind speed and the cut-out wind speed before restarting. During these two normal operating phases of the wind turbine, the impeller 100 obtains wind resources through passive control. When the impeller 100 is rotating normally, it cannot fully utilize wind resources only through passive control, resulting in a relatively low wind energy utilization rate of the impeller 100 during the entire phase from the cut-in wind speed V 切入 to the cut-out wind speed V 切出 .

[0068] Therefore, to address the above technical problems, the embodiments of the present invention provide a wind power generation unit with an improved structure of the blade 10. A new type of blade 10 is adopted to improve the wind energy utilization rate of the wind power generation unit. This blade 10 can be used as an independent product or as a component of the wind power generation unit and integrated into it.

[0069] As Figure 3 and Figure 4 shown, the blade 10 provided by the embodiments of the present invention includes a blade body 11 and a wind guiding component 12. The blade body 11 has a windward surface 111 and a leeward surface 112 that are oppositely arranged. The wind guiding component 12 is at least partially connected to the blade body 11 and can eject gas from the side where the leeward surface 112 is located to the outside of the blade body 11 to adjust the flow rate of the airflow flowing through the leeward surface 112, thereby improving the wind energy utilization rate of the wind power generation unit. The specific working principle is as follows:

[0070] The wind blowing against the wind passes through the leading edge 113 of the blade 10, flows over the windward surface 111 and the leeward surface 112 of the blade 10, and reaches the trailing edge 114 of the blade 10. Due to the presence of the angle of attack, the flow rate of the airflow flowing through the windward surface 111 is less than the flow rate of the airflow flowing through the leeward surface 112. Therefore, the pressure P 迎风侧 on the windward surface 111 is greater than the pressure P 背风侧 on the leeward surface 112

[0071] . Therefore, the pressure difference between the windward surface 111 and the leeward surface 112: P = P 迎风侧 - P 背风侧 > 0, generating lift to drive the impeller 100 to rotate.

[0072] By providing the wind guiding component 12 on the leeward surface 112 of the blade body 11 in the blade 10 provided by the embodiments of the present invention, and enabling the wind guiding component 12 to be at least partially connected to the blade body 11 and eject gas from the side where the leeward surface 112 is located to the outside of the blade body 11, it is possible to use the gas ejected by the wind guiding component 12 to adjust the flow rate of the airflow flowing through the leeward surface 112, thereby changing the value of P 背风侧 .

[0073] For example, gas can be ejected toward the side where the leading edge 113 of the blade 10 is located through the air guiding member 12 to reduce the flow rate of the gas flowing through the leeward surface 112, thereby increasing the value of P 背风侧 by ΔP, reducing the pressure difference P between the windward surface 111 and the leeward surface 112 by ΔP, so as to increase the cut-out wind speed V 切出 when the wind turbine generator is operating at full load, and increasing the wind resource utilization efficiency when the wind speed exceeds the original cut-out wind speed V 切出 .

[0074] Conversely, gas can also be ejected toward the side where the trailing edge 114 of the blade 10 is located through the air guiding member 12 to increase the flow rate of the gas flowing through the leeward surface 112, thereby reducing the value of P 背风侧 by ΔP, increasing the pressure difference P between the windward surface 111 and the leeward surface 112 by ΔP, so as to reduce the rated wind speed V 额定 when the wind turbine generator is operating at full load, and increasing the wind resource utilization efficiency before the original rated wind speed V 额定 .

[0075] Optionally, for the blade 10 provided in the embodiment of the present invention, an air guiding member 12 is provided on at least one of the positions of the leading edge 113 and the trailing edge 114 of the blade body 11 on the side where the leeward surface 112 of the blade body 11 is located, so as to increase and / or reduce the airflow flowing through the leeward surface 112 of the blade 10.

[0076] As Figure 3 and Figure 4 shown, the air guiding member 12 can be provided at the position of the leading edge 113 of the blade body 11 on the side where the leeward surface 112 is located.

[0077] As Figure 5 and Figure 6 shown, in some embodiments, the air guiding member 12 can also be provided at the position of the trailing edge 114 of the blade body 11 on the side where the leeward surface 112 is located.

[0078] As Figure 7 and Figure 8 shown, according to needs, the air guiding member 12 can also be provided at both the leading edge 113 and the trailing edge 114 positions at the same time.

[0079] Continue to refer to Figures 3 to 9As shown, in some alternative embodiments, the air guiding member 12 includes an air guiding duct 121 and a flow control module 122. The air guiding duct 121 is connected to the blade body 11. The air guiding duct 121 has an inner cavity and an air port 121c communicating with the inner cavity. The flow control module 122 is connected to the air guiding duct 121 and adjusts the flow rate of the air flowing into the air guiding duct 121. With the above structural form of the air guiding member 12, gas can be ejected through the air port 121c to meet the flow rate of the air flowing through the leeward surface 112. The correspondingly provided flow control module 122 can adjust the flow rate of the gas entering the air guiding member 12, and can adjust the flow rate of the air flowing through the leeward surface 112 as needed, optimizing the performance of the blade 10.

[0080] As an alternative embodiment, a plurality of air ports 121c can be provided axially along the axial direction X from the root to the tip of the blade body 11. The plurality of air ports 121c can be circular, elliptical or polygonal. Of course, in some embodiments, the air port 121c can also be a strip-shaped hole extending along the length direction of the blade body 11, as long as it can meet the requirement of ejecting air flow toward the side where the leeward surface 112 is located, so as to achieve the requirement of adjusting the flow rate of the air flowing through the leeward surface 112.

[0081] As an alternative embodiment, for the blade 10 provided in the embodiments of the present invention, the air guiding duct 121 includes a first guiding section 121a and a second guiding section 121b that are interconnected. The first guiding section 121a and the second guiding section 121b are successively distributed along the axial direction X of the blade body 11. The first guiding section 121a is disposed inside the blade body 11 and the second guiding section 121b is disposed outside the blade body 11. The air port 121c is disposed on the second guiding section 121b. The first guiding section 121a is connected to a component capable of providing air flow through the flow control module 122. For the blade 10 provided in the embodiments of the present invention, with the above structural form of the air guiding duct 121, on the basis of meeting the requirement of delivering gas to the leeward surface 112 of the blade body 11, since the first guiding section 121a is disposed inside the blade body 11, when the blade 10 is used in a wind turbine generator set, and when the blade 10 makes a pitch movement relative to the hub 20 and the impeller 100 rotates as a whole, the winding of the air duct line can be effectively avoided, ensuring the safety of the blade 10. Moreover, by disposing the second guiding section 121b outside the blade body 11 and providing the air port 121c, on the basis of meeting the flow rate of the air flowing through the leeward surface 112, the modification of the structure of the blade body 11 is minimized, improving the overall load-bearing capacity of the blade 10.

[0082] In some alternative embodiments, in order to ensure the connection between the first guiding section 121a and the second guiding section 121b, a communication hole can be provided on the blade body 11, and the first guiding section 121a and the second guiding section 121b are interconnected through the communication hole.

[0083] As an alternative implementation, for the blade 10 provided in the embodiments of the present invention, a wind guiding component 12 is provided at the leading edge 113 of the blade body 11. The air port 121c on the air duct 121 of the wind guiding component is inclined at a predetermined angle towards the side where the leading edge 113 is located, so that the air flow ejected from the air port 121c of the air duct 121 at the leading edge 113 position can flow in a direction opposite to the flow direction of the air flow flowing from the leading edge 113 position to the trailing edge 114 position on the leeward surface 112, better meeting the requirement of reducing the air flow velocity of the air flow flowing through the leeward surface 112 by the wind guiding component 12 provided at the leading edge 113 position.

[0084] As Figure 10 shown, in some alternative embodiments, when the wind guiding component 12 located at the leading edge 113 position is inclined towards the leading edge 113 position, the connecting line between the center of the air port 121c and the center of the air duct is inclined counterclockwise towards the leading edge 113 position and intersects with the leeward surface 112. The intersection angle α is any value between 15° and 60°, including the two end values of 15° and 60°. In some alternative examples, 45° can be adopted. Through the above settings, it is possible to meet the requirement of reducing the air flow velocity of the leeward surface 112, and the adjustment range is relatively wide.

[0085] As Figure 11 shown, as an alternative implementation, when the wind guiding component 12 located at the trailing edge 114 position is inclined towards the trailing edge 114 position, the connecting line between the center of the air port 121c and the center of the air duct is inclined clockwise towards the side where the trailing edge 114 is located at a predetermined angle and intersects with the leeward surface 112. The intersection angle β is any value between 15° and 60°, including the two end values of 15° and 60°. In some alternative examples, 45° can be adopted. Through the above settings, it is possible to meet the requirement of increasing the air flow velocity of the leeward surface 112, and the adjustment range is relatively wide.

[0086] As Figures 12 to 15 shown, as an alternative implementation, for the blade 10 provided in the embodiments of the present invention, the number of air ducts 121 included in the wind guiding component 12 is more than two. The two or more air ducts 121 are spaced apart in the chord direction Y of the blade body 11, and each air duct 121 is correspondingly connected to a flow control module 122. By setting the number of air ducts 121 included in the wind guiding component 12 to be more than two, the coverage area of the wind guiding component 12 on the leeward surface 112 can be increased, and the adjustment effect on the air flow flowing through the leeward surface 112 can be optimized.

[0087] As an alternative implementation, in the embodiments of the present invention, air guiding components 12 may be provided at both the leading edge 113 position and the trailing edge 114 position of the blade body 11, and the number of air guiding pipes 121 included in each air guiding component 12 may be one or two, which can be specifically set according to the adjustment requirements.

[0088] In some alternative embodiments, for the blade 10 provided in the embodiments of the present invention, the flow control module 122 included in the air guiding component 12 may include a regulating valve, such as a flow regulating valve. In some alternative examples, a solenoid valve may be used, which is easy to control and can ensure the adjustment requirements for the air flow velocity on the leeward surface 112.

[0089] In some alternative embodiments, for the blade 10 provided in the above embodiments of the present invention, the air guiding pipe 121 including the first diversion section 121a and the second diversion section 121b is taken as an example for illustration. This is an alternative implementation. In some embodiments, the air guiding pipe 121 may also be integrally disposed inside the blade body 11 and extend along the axial direction X of the blade body 11. An outlet opposite to and communicating with the air port 121c is provided on the blade body 11. The air flow ejected from the air port 121c of the air guiding pipe 121 can flow out through the outlet on the blade body 11, and can also meet the adjustment requirements for the air flow velocity flowing through the leeward surface 112.

[0090] Such as Figure 1 and Figure 16 As shown, as an alternative implementation, when the blade 10 provided in the embodiments of the present invention is used in a wind power generation set and is a component of the wind power generation set, in order to better supply air flow to the air guiding component 12, the wind power generation set provided in the embodiments of the present invention further includes a air supply component 200. The air supply component 200 is connected to the air guiding component 12 and is used to supply air flow to the air guiding component 12. When the blade 10 is used in a wind power generation set, it can effectively adjust the air flow on its own leeward surface 112, and further change the pressure difference between the windward surface 111 and the leeward surface 112.

[0091] When the wind power generation set is operating, in order to ensure that the blade 10 is connected to the hub 20 or a component similar to the hub 20 in function, and to ensure that the blade 10 does not interfere with the nacelle 500 or the tower 400, the root of the blade 10 is circular and the fairing in front of the hub 20 directly diverts the wind to the rear of the wind power generation set. When the impeller 100 of the wind power generation set rotates normally, only passive control cannot fully utilize the wind resources in a certain area in the middle of the front of the impeller 100, which further causes waste of wind resources. Therefore, as an alternative implementation, the air supply component 200 may be connected to at least one of the hub 20 and the root of the blade 10. In this way, the air supply component 200 can reasonably utilize the wind resources in the corresponding areas in the front of the impeller 100 and / or at the root of the blade.

[0092] As an optional implementation, the air supply component 200 may include an air collecting hood 210 and a transfer pipe 220 connecting the air collecting hood 210 and the air guide component 12. The air collecting hood 210 is connected to the hub 20 and can guide at least part of the ambient wind to the air guide component 12 via the transfer pipe 220. The air supply component 200 includes the air collecting hood 210 and is connected to the hub 20. It can naturally collect at least a certain area of ​​wind resources in the middle of the front face of the impeller 100 without providing a power source and transport it to the air guide component 12 through the transfer pipe 220, so as to adjust the flow rate of the airflow on the leeward side 112 of the corresponding blade 10.

[0093] As an optional implementation, the wind collecting cover 210 is connected to one end of the hub 20 in the extension direction of the central axis, and the orthographic projection of the wind collecting cover 210 in the extension direction covers the hub 20 and at least part of the blade root. The above configuration enables the wind collecting cover 210 to naturally collect the wind resources in the corresponding area in the middle of the front of the impeller 100 and the wind resources in the corresponding area of ​​the blade root of each blade 10 and transport them to the wind guide component 12 through the connecting pipeline for use by the wind guide component 12, thereby further improving the wind energy utilization rate of the wind turbine generator set.

[0094] In some optional embodiments, the wind turbine generator set provided by the embodiment of the present invention may include a wind collecting hood 210 including a connecting hood 211 and an air inlet hood 212, the connecting hood 211 and the air inlet hood 212 are connected to each other and enclosed to form a wind cavity, the connecting hood 211 is plugged into the interior of the hub 20 and has an air outlet 211c connected to the transfer pipe 220 and the wind cavity, and the air inlet hood 212 is located on the side of the connecting hood 211 away from the hub 20 and has a plurality of air inlets 212a connected to the wind cavity. The wind collecting hood 210 adopts the above-mentioned form, which can not only meet the collection of wind resources required by the wind guide component 12, but also facilitate the connection between the wind collecting hood 210 and the hub 20 and the transportation of the collected wind resources to the wind guide component 12.

[0095] In some optional embodiments, a socket is provided at one end of the hub 20 facing the wind collecting cover 210. The connecting housing 211 includes an inserted section 211a and a disc-shaped base 211b that are connected to each other. The inserted section 211a is in the shape of a conical cylinder and matches the shape of the socket. The disc-shaped base 211b is arranged around the inserted section 211a, and the air outlet 211c is arranged on the side of the inserted section 211a facing away from the disc-shaped base 211b. Optionally, the air inlet housing 212 is integrally an arc-shaped housing. One end of the air inlet housing 212 facing the disc-shaped base 211b is butted against the disc-shaped base 211b to form an air cavity. The air inlet housing 212 protrudes towards the end away from the connecting housing 211, and a plurality of air inlets 212a are spaced apart on the arc-shaped surface of the air inlet housing 212. The wind collecting cover 210 configured in the above structure is beneficial to the collection of wind energy, and at the same time can achieve flow guiding through the arc-shaped surface of the air inlet housing 212, reducing the wind resistance of the wind collecting cover 210.

[0096] As an optional implementation manner, a control valve 213 is provided at the air outlet 211c of the wind collecting cover 210, which can be used to control the air flow rate entering the transfer pipeline 220.

[0097] It can be understood that in the wind turbine provided in the above embodiments of the present invention, the air supply component 200 is not limited to the form of the wind collecting cover 210. In some embodiments, the air supply component 200 can also adopt an axial flow fan or a wind collection and pressurization device, as long as the air supply requirement can be met.

[0098] The wind turbine provided by the embodiment of the present invention includes the blade 10 and the air supply component 200 provided in the above embodiments. It can supply air flow into the air guiding component 12 through the air supply component 200 to adjust the air flow velocity on the leeward surface 112 of the corresponding blade 10, effectively improving the utilization rate of wind energy of the wind turbine.

[0099] As Figure 17 shown, optionally, based on the foregoing technical problems, in order to better control the wind turbine provided in the above embodiments of the present invention and improve the utilization rate of wind energy and the power generation efficiency of the wind turbine, the embodiment of the present invention further provides a control method for a wind turbine. This control method can be used to control the wind turbine provided in the above embodiments. The control method includes:

[0100] S100. Obtain the wind speed of the current ambient wind;

[0101] S200. When the wind speed of the ambient wind falls within the first preset interval, control the air guiding component 12 to jet air flow from the side where the leeward surface 112 is located to a predetermined direction to adjust the air flow velocity flowing through the leeward surface 112.

[0102] The control method provided by the embodiment of the present invention is used to control a wind turbine. Since the blade 10 includes a wind guiding component 12, the wind guiding component 12 can adjust the flow velocity of the air flow passing through the leeward surface 112 of the blade 10. This control method can obtain the wind speed of the current ambient wind, and when the wind speed of the ambient wind falls within a first preset range, control the wind guiding component 12 to eject air flow from the side where the leeward surface 112 is located to a predetermined direction, so as to adjust the flow velocity of the air flow passing through the leeward surface 112. By adjusting the flow velocity of the air flow passing through the leeward surface 112, the pressure difference between the leeward surface 112 and the windward surface 111 can be adjusted, and further the lift force that drives the impeller 100 of the wind turbine to rotate can be adjusted, so that the part of the wind conditions in the ambient wind that is lower than the rated wind speed V 额定 of the initial value and / or higher than the cut-out wind speed V 切出 of the initial value can be utilized, the power corresponding to the specified wind speed in the optimal wind power capture stage of the wind turbine can be increased and / or the wind speed range corresponding to the rated power in the full-load stage can be expanded, thereby improving the wind energy utilization rate of the wind turbine and ensuring the power generation benefit. Moreover, through the control method provided by the embodiment of the present invention, the wind guiding component 12 can be controlled to be turned on at an appropriate time to ensure the effectiveness of its operation.

[0103] In some optional embodiments, when the wind guiding component 12 is arranged at the trailing edge 114 of the blade 10 of the wind turbine, step S200 includes that when the first preset range includes the range from the value of the cut-in wind speed V 切入 during the operation of the wind turbine to the first value, control the wind guiding component 12 to eject air flow from the side where the leeward surface 112 is located to the direction where the trailing edge 114 of the blade body 11 is located, so as to increase the flow velocity of the air flow passing through the leeward surface 112, so that the value of the rated wind speed V 额定 during the full-load operation of the wind turbine is reduced from the initial value to the first value.

[0104] As described above in the wind turbine, the initial values of the cut-in wind speed V 切入 , the rated wind speed V 额定 and the cut-out wind speed V 切出 of the conventional wind turbine are known and set. Specifically, they are set according to parameters such as the model of the wind turbine and the power of the generator 600. And when the wind turbine starts to operate, it is generally divided into the optimal wind power capture stage from the cut-in wind speed V 切入 to the rated wind speed V 额定 , and the full-load stage between the rated wind speed V 额定 and the cut-out wind speed V 切出 . When the wind turbine enters the full-load stage, the power generation effect of the wind turbine is high and it will operate at the rated power.

[0105] Such as Figure 18As shown, the method provided in the above example, when the first preset interval includes the cut-in wind speed V when the wind turbine generator set is running 切出 When the value of the ambient wind falls within the range of the cut-in wind speed V 切入 When the value of the first value is within the interval range, the wind guide component 12 is controlled to spray air from the leeward surface 112 to the direction of the trailing edge 114 of the blade body 11, so as to increase the flow rate of the gas flowing through the leeward surface 112, thereby making P 背风侧 The value of is reduced by ΔP, so that the pressure difference P between the windward surface 111 and the leeward surface 112 increases by ΔP, thereby reducing the rated wind speed V when the wind turbine generator set is fully powered. 额定 The wind-catching interval corresponding to the full-fire stage will switch from the initial aa1 to aa2. Compared with aa1, the first value is increased to the rated wind speed V 额定 The initial value interval corresponds to the utilization rate of the ambient wind speed, expanding the wind speed interval corresponding to the rated power in the full-power stage, that is, it can make the wind turbine generator set operate at a partially lower wind speed than the originally set rated wind speed V 额定 The wind turbine can also enter the full power generation stage under the action of the ambient wind of the initial value, thereby improving the utilization of wind energy and further improving the power generation efficiency of the wind turbine. Moreover, in this interval, by controlling the wind guide component 12 to spray airflow from the side of the leeward surface 112 to the direction of the trailing edge 114 of the blade body 11, the relationship curve corresponding to the operating power and wind speed of the wind turbine in the optimal wind power capture stage can be switched from AA1 to AA2. By comparing the relationship curves AA1 and AA2, it can be learned that under the same wind speed, the operating power of the wind turbine can be higher after the auxiliary action of the wind guide component 12, thereby increasing the power corresponding to the specified wind speed of the wind turbine in the optimal wind power capture stage and further improving the utilization rate of wind energy.

[0106] The first value is set according to the model of the wind turbine generator set and the ability of the wind guide member 12 to affect the flow velocity of the airflow on the leeward side 112 of the blade 10, and is greater than the known set cut-in wind speed V of the wind turbine generator set. 切入 And less than the rated wind speed V 额定 .

[0107] Optionally, when the first preset interval includes the cut-in wind speed V when the wind turbine generator set is in operation 切入 When the value is within the interval range from the value of to the first value, the wind guide component 12 located at the trailing edge 114 of the blade 10 can be controlled to open to increase the flow rate of the airflow on the leeward surface 112.

[0108] like Figure 18As shown, as an alternative, when a wind guiding component 12 is provided at the leading edge 113 of the blade 10 of the wind turbine generator, step S200 includes that when the first preset interval includes the interval range from the second value to the third value, the wind guiding component 12 is controlled to jet air flow from the side where the leeward surface 112 is located towards the leading edge 113 of the blade 10, so as to reduce the flow velocity of the air flow flowing through the leeward surface 112, such that the value of the cut-out wind speed during the full-load operation stage of the wind turbine generator increases from the initial value to the third value. Wherein, the second value is less than or equal to the rated wind speed V of the wind turbine generator during the full-load operation stage 额定 of the initial value.

[0109] When the first preset interval includes the interval range from the second value to the third value, that is, when the wind speed of the ambient wind falls within the interval range from the second value to the third value, the wind guiding component 12 is controlled to jet air flow from the side where the leeward surface 112 is located towards the leading edge 113 of the blade 10, so as to reduce the flow velocity of the air flow flowing through the leeward surface 112, and further make P 背风侧 the value increase by ΔP, such that the pressure difference P between the windward surface 111 and the leeward surface 112 decreases by ΔP, thereby being able to increase the value of the cut-out wind speed during the full-load operation of the wind turbine generator, making it increase to the third value. That is to say, it can enable the wind turbine generator to remain in the full-load stage under the action of a part of the ambient wind with a wind speed greater than the original set cut-out wind speed V 切出 of the initial value, improve the utilization of wind energy, and further improve the power generation efficiency of the wind turbine generator.

[0110] Similarly, the third value is set according to the model of the wind turbine generator and the influencing ability of the provided wind guiding component 12 on the flow velocity of the air flow on the leeward surface 112 of the blade 10.

[0111] For the second value, it can be determined according to the setting of the wind guiding component 12 at the leading edge 113 position and the trailing edge 114 position of the blade 10 of the controlled wind turbine generator.

[0112] Exemplarily, when the wind guiding component 12 is provided only at the leading edge 113 of the blade body 11 of the wind turbine generator, the second value is equal to the initial value of the rated wind speed V 额定 of the initial value. By controlling the wind guiding component 12 to jet air flow from the side where the leeward surface 112 is located towards the leading edge 113 of the blade 10, the wind-catching interval corresponding to the full-load stage can be switched from the initial aa1 to aa3. Compared with aa1, the utilization rate of the ambient wind speed in the interval from the initial value of the cut-out wind speed V 切出 to the third value is increased, the wind speed interval corresponding to the rated power in the full-load stage is expanded, such that the wind turbine generator is in a part of the ambient wind with a wind speed greater than the original set cut-out wind speed V 切出Under the action of the environmental wind with the initial value, it can still remain in the full-load stage, improving the utilization of wind energy.

[0113] Exemplarily, when the leading edge 113 position and the trailing edge 114 position of the blade body 11 of the wind turbine are both provided with the air guiding components 12, the second value is less than the rated wind speed V 额定 of the initial value and greater than or equal to the rated wind speed V 额定 Under the action of the air guiding component 12 at the trailing edge 114 position, the adjusted and reduced value, that is to say, the second value can be greater than or equal to the first value. Taking the second value equal to the first value as an example, when the leading edge 113 position and the trailing edge 114 position are both provided with the air guiding components 12, the control method provided by the embodiment of the present invention can pre-control the air guiding component 12 provided at the trailing edge 114 position to eject air flow in the direction of the trailing edge 114, so that the rated wind speed V of the wind turbine in the full-load stage 额定 is reduced from the initial value to the first value, and then control the air guiding component 12 provided at the leading edge 113 position to eject air flow in the direction of the leading edge 113, so that the cut-out wind speed V in the full-load stage 切出 is increased from the initial value to the third value. Ensure that the wind-catching interval corresponding to the full-load stage is switched from the initial aa1 to aa4. Compared with aa1, the utilization rate of the environmental wind speed in the interval from the first value to the rated wind speed V 额定 of the initial value is increased, and the utilization rate of the environmental wind speed corresponding to the cut-out wind speed V 切出 from the initial value to the third value is increased, expanding the wind speed interval corresponding to the rated power in the full-load stage and improving the power generation efficiency of the wind turbine.

[0114] As an optional implementation manner, for the control method provided by the embodiment of the present invention, when the wind speed of the environmental wind does not fall within the range of the first preset interval, the air guiding component 12 is closed.

[0115] Exemplarily, when the wind turbine is only provided with the air guiding component 12 at the trailing edge 114 position of the blade body 11, then when the wind speed of the environmental wind is less than the cut-in wind speed V 切入 or greater than the first value, the air guiding component 12 is controlled to close.

[0116] Exemplarily, when the wind turbine is only provided with the air guiding component 12 at the leading edge 113 position of the blade body 11, then when the wind speed of the environmental wind is less than the rated wind speed V 额定 of the initial value of the wind turbine or greater than the third value, the air guiding component 12 is controlled to close.

[0117] Exemplarily, when the wind turbine is provided with the air guiding components 12 at the trailing edge 114 position and the leading edge 113 position of the blade 10, then when the wind speed of the environmental wind is less than the cut-in wind speed V 切入Or greater than the third value, then control the air guiding component 12 to close.

[0118] The control method provided by the embodiment of the present invention can be used for the wind turbine generators provided in the above embodiments, and can obtain the wind speed of the current ambient wind in the area where the wind turbine generator is located. When the wind speed of the ambient wind falls within the first preset interval, control the air guiding component 12 to jet air flow from the side where the leeward surface 112 is located to a predetermined direction, so as to adjust the flow rate of the air flow flowing through the leeward surface 112. By adjusting the flow rate of the air flow flowing through the leeward surface 112, the pressure difference between the leeward surface 112 and the windward surface 111 can be adjusted, and further the lift force that drives the impeller 100 of the wind turbine generator to rotate can be adjusted, so that part of the wind conditions in the ambient wind that are lower than the rated wind speed V 额定 and / or higher than the preset cut-out wind speed V 切出 can be utilized, improving the power corresponding to the specified wind speed in the optimal wind power capture stage of the wind turbine generator and / or expanding the wind speed interval corresponding to the rated power in the full-load stage, thereby improving the wind energy utilization rate of the wind turbine generator and ensuring the power generation benefit.

[0119] As Figure 19 shown, optionally, the embodiment of the present invention further provides a control device for the wind turbine generators in the above embodiments. The control device includes:

[0120] A collection module 1 for obtaining the wind speed of the current ambient wind.

[0121] A control module 2 for controlling the air guiding component 12 to jet air flow from the side where the leeward surface 112 is located to a predetermined direction when the wind speed of the ambient wind falls within the first preset interval, so as to adjust the flow rate of the air flow flowing through the leeward surface 112.

[0122] The control device provided by the embodiment of the present invention can be used for the wind turbine generators provided in the above embodiments. It can obtain the wind speed of the current ambient wind through the collection module, and through the control module 2, when the wind speed of the ambient wind falls within the first preset interval, control the air guiding component 12 to jet air flow from the side where the leeward surface 112 is located to a predetermined direction, so as to adjust the flow rate of the air flow flowing through the leeward surface 112. By adjusting the flow rate of the air flow flowing through the leeward surface 112, the pressure difference between the leeward surface 112 and the windward surface 111 can be adjusted, and further the lift force that drives the impeller 100 of the wind turbine generator to rotate can be adjusted, so that part of the wind conditions in the ambient wind that are lower than the preset rated wind speed in the prior art and / or higher than the preset cut-out wind speed can be utilized and the wind turbine generator is in the full-load stage, improving the utilization rate of wind energy and the power generation benefit of the wind turbine generator.

[0123] As an alternative implementation, for the control device provided in the embodiments of the present invention, when the first preset interval includes the range from the value of the cut-in wind speed during the operation of the wind turbine generator to the first value, the control module 2 is configured to control the air guiding member 12 to jet air flow from the side where the windward surface 112 is located towards the trailing edge 114 of the blade body 11, so as to increase the flow rate of the air flow flowing through the windward surface 112, and enable the value of the rated wind speed during the full-load operation stage of the wind turbine generator to be reduced from the initial value to the first value.

[0124] As an alternative implementation, for the control device provided in the embodiments of the present invention, when the first preset interval includes the range from the second value to the third value, the control module 2 is configured to control the air guiding member 12 to jet air flow from the side where the windward surface 112 is located towards the leading edge 113 of the blade 10, so as to reduce the flow rate of the air flow flowing through the windward surface 112, and enable the value of the cut-out wind speed during the full-load operation stage of the wind turbine generator to be increased from the initial value to the third value, where the second value is less than or equal to the initial value of the rated wind speed during the full-load operation stage of the wind turbine generator.

[0125] As an alternative implementation, for the control device provided in the embodiments of the present invention, when the air guiding member 12 is provided at the position of the leading edge 113 of the blade body 11 of the wind turbine generator, the second value is equal to the initial value of the rated wind speed; when the air guiding member 12 is provided at both the position of the leading edge 113 and the position of the trailing edge 114 of the blade body 11 of the wind turbine generator, the second value is less than the initial value of the rated wind speed and greater than or equal to the value adjusted and reduced under the action of the air guiding member 12 at the position of the trailing edge 114 of the rated wind speed.

[0126] As an alternative implementation, when the wind speed of the ambient wind does not fall within the range of the first preset interval, the control module 2 is further configured to close the air guiding member 12.

[0127] As Figure 1 As shown, as an alternative implementation, in order to better execute the control method provided in the above embodiments, the wind turbine generator provided in the embodiments of the present invention further includes a controller 300, and the controller 300 is configured to obtain the wind speed of the current ambient wind of the wind turbine generator. When the wind speed of the ambient wind falls within the first preset interval, the controller 300 controls the air guiding member 12 to jet air flow from the side where the windward surface 112 is located towards a predetermined direction, so as to adjust the flow rate of the air flow flowing through the windward surface 112 of the blade 10.

[0128] Optionally, when the air guiding member 12 includes an air duct 121 and a flow control module 122, the controller 300 is electrically connected to the flow control module 122 to better control the opening and closing of the air guiding member 12 and the flow rate of the jet air flow.

[0129] As an alternative implementation manner, for the wind turbine generator set provided in the embodiment of the present invention, when a wind guiding component 12 is arranged on the side where the leeward surface 112 of the blade body 11 is located and at the trailing edge 114 position, the controller 300 is configured to control the wind guiding component 12 to jet air flow from the side where the leeward surface 112 is located towards the direction of the trailing edge 114 of the blade body 11 when the first preset interval includes the numerical range from the cut-in wind speed during the operation of the wind turbine generator set to the first numerical value, so as to increase the flow rate of the air flow flowing through the leeward surface 112, and make the numerical value of the rated wind speed during the full-load operation stage of the wind turbine generator set decrease from the initial numerical value to the first numerical value.

[0130] As an alternative implementation manner, for the wind turbine generator set provided in the embodiment of the present invention, when a wind guiding component 12 is arranged on the side where the leeward surface 112 of the blade body 11 is located and at the leading edge 113 position, the controller 300 is configured to control the wind guiding component 12 to jet air flow from the side where the leeward surface 112 is located towards the direction of the leading edge 113 of the blade 10 when the first preset interval includes the numerical range from the second numerical value to the third numerical value, so as to decrease the flow rate of the air flow flowing through the leeward surface 112, and make the numerical value of the cut-out wind speed during the full-load operation stage of the wind turbine generator set increase from the initial numerical value to the third numerical value, wherein the second numerical value is less than or equal to the initial numerical value of the rated wind speed during the full-load operation stage of the wind turbine generator set.

[0131] It should be noted that the control method, control device of the wind turbine generator set and each embodiment of the wind turbine generator set in this specification are all described in a progressive manner, and the same or similar parts between each embodiment can be referred to each other. For the embodiment of the control device of the wind turbine generator set and the embodiment of the controller 300 included in the wind turbine generator set, the relevant parts can refer to the description part of the embodiment of the control method of the wind turbine generator set. The present application is not limited to the specific steps and structures described above and shown in the figures. Those skilled in the art can make various changes, modifications and additions after understanding the spirit of the present application, or change the order between steps. And, for the sake of simplicity, the detailed description of the known method technologies is omitted here.

[0132] Although the present invention has been described with reference to the preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present invention is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A control method for a wind turbine generator set, the wind turbine generator set including blades (10), the blades (10) including blade bodies (11) and air guiding components (12) at least partially connected to the blade bodies (11), the air guiding components (12) being capable of jetting gas from the side where the leeward surface (112) of the blade bodies (11) is located to the outside of the blade bodies (11), characterized in that, The control method includes: Obtaining the wind speed of the current ambient wind; When the wind speed of the ambient wind falls within a first preset range, controlling the air guiding component (12) to jet air flow from the side where the leeward surface (112) is located to a predetermined direction, so as to adjust the flow rate of the air flow passing through the leeward surface (112); Wherein, when the first preset range includes the range from the value of the cut-in wind speed during the operation of the wind turbine generator set to a first value, controlling the air guiding component (12) to jet air flow from the side where the leeward surface (112) is located to the direction where the trailing edge (114) of the blade body (11) is located, so as to increase the flow rate of the air flow passing through the leeward surface (112), such that the value of the rated wind speed during the full-load operation stage of the wind turbine generator set is reduced from an initial value to the first value; and / or, when the first preset range includes the range from a second value to a third value, controlling the air guiding component (12) to jet air flow from the side where the leeward surface (112) is located to the direction where the leading edge (113) of the blade (10) is located, so as to reduce the flow rate of the air flow passing through the leeward surface (112), such that the value of the cut-out wind speed during the full-load operation stage of the wind turbine generator set is increased from an initial value to the third value, wherein the second value is less than or equal to the initial value of the rated wind speed during the full-load operation stage of the wind turbine generator set.

2. The control method according to claim 1, characterized in that, When the air guiding component (12) is arranged at the position of the leading edge (113) of the blade body (11) of the wind turbine generator set, the second value is equal to the initial value of the rated wind speed; When the air guiding component (12) is arranged at both the position of the leading edge (113) and the position of the trailing edge (114) of the blade body (11) of the wind turbine generator set, the second value is less than the initial value of the rated wind speed and greater than or equal to the value of the rated wind speed adjusted and reduced under the action of the air guiding component (12) at the position of the trailing edge (114).

3. The control method according to claim 1 or 2, characterized in that, The control method further includes, when the wind speed of the ambient wind does not fall within the first preset range, closing the air guiding component (12).

4. A control device for a wind turbine generator set, the wind turbine generator set including blades (10), the blades (10) including blade bodies (11) and air guiding components (12) at least partially connected to the blade bodies (11), the air guiding components (12) being capable of jetting gas from the side where the leeward surface (112) of the blade bodies (11) is located, characterized in that, The control device includes: An acquisition module, configured to obtain the wind speed of the current ambient wind; A control module, configured to, when the wind speed of the ambient wind falls within a first preset range, control the air guiding component (12) to jet air flow from the side where the leeward surface (112) is located to a predetermined direction, so as to adjust the flow rate of the air flow passing through the leeward surface (112); Wherein, when the first preset interval includes the range from the value of the cut-in wind speed during the operation of the wind turbine generator to the first value, the guiding component (12) is controlled to jet air flow from the side where the leeward surface (112) is located towards the trailing edge (114) of the blade body (11), so as to increase the flow rate of the air flow flowing through the leeward surface (112), and the value of the rated wind speed during the full-load operation stage of the wind turbine generator is reduced from the initial value to the first value; and / or, when the first preset interval includes the range from the second value to the third value, the guiding component (12) is controlled to jet air flow from the side where the leeward surface (112) is located towards the leading edge (113) of the blade (10), so as to reduce the flow rate of the air flow flowing through the leeward surface (112), and the value of the cut-out wind speed during the full-load operation stage of the wind turbine generator is increased from the initial value to the third value, wherein the second value is less than or equal to the initial value of the rated wind speed during the full-load operation stage of the wind turbine generator.

5. A wind turbine generator set, characterized in that, Comprising: An impeller (100), including a hub (20) and blades (10) connected to each other, two or more of the blades (10) are spaced apart around the central axis of the hub (20), and the blade (10) includes a blade body (11) and a guiding component (12) at least partially connected to the blade (10), and the guiding component (12) can jet gas from the side where the leeward surface (112) of the blade body (11) is located; An air supply component (200), connected to the guiding component (12) for supplying air flow to the guiding component (12); A controller (300), configured to obtain the wind speed of the current ambient wind of the wind turbine generator, and when the wind speed of the ambient wind falls within the first preset interval, control the guiding component (12) to jet air flow from the side where the leeward surface (112) is located towards a predetermined direction, so as to adjust the flow rate of the air flow flowing through the leeward surface (112) of the blade (10); Wherein, the guiding component (12) is arranged at the position of the trailing edge (114) on the side where the leeward surface (112) of the blade body (11) is located, and the controller (300) is configured to control the guiding component (12) to jet air flow from the side where the leeward surface (112) is located towards the trailing edge (114) of the blade body (11) when the first preset interval includes the range from the value of the cut-in wind speed during the operation of the wind turbine generator to the first value, so as to increase the flow rate of the air flow flowing through the leeward surface (112), and the value of the rated wind speed during the full-load operation stage of the wind turbine generator is reduced from the initial value to the first value; And / or, a wind guiding component (12) is arranged on the side where the leeward surface (112) of the blade body (11) is located and at the leading edge (113) position. When the first preset interval includes the interval range from a second value to a third value, the controller (300) is configured to control the wind guiding component (12) to jet air flow from the side where the leeward surface (112) is located towards the leading edge (113) direction of the blade (10), so as to reduce the flow velocity of the air flow flowing through the leeward surface (112), and increase the value of the cut-out wind speed of the wind turbine during full-load operation from an initial value to the third value, wherein the second value is less than or equal to the initial value of the rated wind speed of the wind turbine during full-load operation.

6. The wind turbine generator set according to claim 5, characterized in that, The wind guiding component (12) includes an air duct (121) and a flow control module (122). The air duct (121) is connected to the blade body (11). The air duct (121) has an inner cavity and an air port (121c) communicating with the inner cavity. The flow control module (122) is connected between the air duct (121) and the air supply component (200) and adjusts the flow rate of the air flow sent into the air duct (121) by the air supply component (200). The controller (300) is electrically connected to the flow control module (122).

7. The wind turbine generator set according to claim 6, characterized in that, The air duct (121) includes a first diversion section (121a) and a second diversion section (121b) that are interconnected. The first diversion section (121a) and the second diversion section (121b) are successively distributed along the axial direction (X) of the blade body (11). The first diversion section (121a) is arranged inside the blade body (11) and the second diversion section (121b) is arranged outside the blade body (11). The air port (121c) is arranged on the second diversion section (121b). The first diversion section (121a) is connected to the air supply component (200) through the flow control module (122).

8. The wind turbine generator set according to claim 6, characterized in that, The air duct (121) is integrally arranged inside the blade body (11) and extends along the axial direction (X) of the blade body (11). An outlet that is arranged opposite to and communicates with the air port (121c) is arranged on the blade body (11).

9. The wind turbine generator set according to claim 6, characterized in that, The wind guiding component (12) is arranged at both the leading edge (113) position and the trailing edge (114) position. The air port (121c) of the air duct (121) at the leading edge (113) position is inclined at a predetermined angle towards the side where the leading edge (113) is located, and the air port (121c) of the air duct (121) at the trailing edge (114) position is inclined at a predetermined angle towards the side where the trailing edge (114) is located. And / or, the number of the air ducts (121) included in the wind guiding component (12) is more than two. The more than two air ducts (121) are spaced apart in the chordwise direction (Y) of the blade body (11). Each air duct (121) is correspondingly connected with a flow control module (122).

10. The wind turbine according to any one of claims 5 to 8, characterized in that The air supply component (200) is connected to at least one of the hub (20) and the blade root of the blade (10).

11. The wind turbine according to claim 10, characterized in that The air supply component (200) comprises an air collecting hood (210) and a transfer pipe (220) connecting the air collecting hood (210) and the air guiding component (12); the air collecting hood (210) is connected to the hub (20) and is capable of guiding at least part of the ambient wind to the air guiding component (12) via the transfer pipe (220).

12. The wind turbine according to claim 11, characterized in that The wind collecting hood (210) is connected to one end of the hub (20) in the extension direction of the central axis, and the orthographic projection of the wind collecting hood (210) in the extension direction covers the hub (20) and at least a portion of the blade root.

13. The wind turbine according to claim 12, characterized in that The wind collecting hood (210) comprises a connecting hood (211) and an air inlet hood (212); the connecting hood (211) and the air inlet hood (212) are connected to each other and enclosed to form an air cavity; the connecting hood (211) is plugged into the interior of the wheel hub (20) and has an air outlet (211c) connected to the transfer pipe (220) and the air cavity; the air inlet hood (212) is located on a side of the connecting hood (211) away from the wheel hub (20) and has a plurality of air inlets (212a) connected to the air cavity.

14. A blade (10), characterized in that include: The blade body (11) has a leeward surface (112); an air guide component (12) at least partially connected to the blade body (11) and capable of ejecting gas from the side where the leeward surface (112) is located toward the outside of the blade body (11) to adjust the flow rate of the airflow passing through the leeward surface (112); The wind guide component (12) is respectively arranged on the side where the leeward surface (112) is located and corresponding to the leading edge (113) of the blade body (11) and the trailing edge (114) of the blade body (11); the wind guide component (12) arranged at the leading edge (113) is configured to spray airflow in the direction of the leading edge (113); and the wind guide component (12) arranged at the trailing edge (114) is configured to spray airflow in the direction of the trailing edge (114).

15. The blade (10) according to claim 14, characterized in that The air guide component (12) comprises an air guide pipe (121), the air guide pipe (121) comprising a first air guide section (121a) and a second air guide section (121b) which are interconnected, the first air guide section (121a) and the second air guide section (121b) being distributed successively along the axial direction (X) of the blade body (11), the first air guide section (121a) being arranged inside the blade body (11) and the second air guide section (121b) being arranged outside the blade body (11), and the second air guide section (121b) being provided with an air port (121c).

Images