Wind power generation device and wind power generation system

Abstract

The application relates to the technical field of wind power generation, and discloses a wind power generation device and a wind power generation system. The wind power generation device comprises an Archimedes wind wheel, a cabin, a main wind wheel and a connecting shaft. The cabin, the main wind wheel and the Archimedes wind wheel are arranged in sequence along a first direction. The connecting shaft is connected with the cabin, the connecting shaft is arranged in parallel to the first direction, and the main wind wheel and the Archimedes wind wheel are arranged on the connecting shaft. The rotation direction of the Archimedes wind wheel is the same as the rotation direction of the main wind wheel. When the main wind wheel rotates, the Archimedes wind wheel and the main wind wheel rotate synchronously around the same rotation shaft. The Archimedes wind wheel is used for generating a braking torque opposite to the output torque of the main wind wheel when the rotating speed of the main wind wheel exceeds the rated rotating speed. In the above manner, the application can improve the reliability of the wind power generation device, and reduce the production and maintenance costs.

Description

Technical Field

[0001] This application relates to the field of wind power generation technology, and in particular to a wind power generation device and a wind power generation system. Background Technology

[0002] In a horizontal axis wind turbine, the rotating shaft is parallel to the horizontal plane. Airflow drives the blades to rotate, converting the fluid's kinetic energy into the blades' mechanical energy. This mechanical energy is then converted into electrical energy by the generator to power electrical appliances. Existing horizontal axis wind turbines face a wide range of natural wind speeds in actual operation, necessitating the addition of a braking system to protect the turbine body and system components under high wind speed conditions.

[0003] However, existing braking systems all have varying degrees of defects: in mechanical braking, the friction pads wear out quickly, maintenance costs are high, and braking force is significantly reduced under high-temperature conditions; in pitch braking, the pitch mechanism has a complex structure, braking response is delayed, and manufacturing and maintenance costs are high; in yaw braking, the whole machine is subjected to uneven force, structural stress is large, and the life of the unit is affected; in electrical braking, its normal operation depends on the power grid and power electronic equipment, and braking failure will occur when the power grid fails. Summary of the Invention

[0004] In view of the problems existing in the background art, the purpose of this application is to provide a wind power generation device and a wind power generation system that overcomes or at least partially solves the above problems.

[0005] According to a first aspect of this application, a wind power generation device is provided, comprising an Archimedes wind turbine, a nacelle, a main wind turbine, and a connecting shaft. The nacelle, main wind turbine, and Archimedes wind turbine are arranged sequentially along a first direction. The nacelle includes a nacelle housing and a generator, with the generator housed within the nacelle housing. The connecting shaft is connected to the nacelle and is arranged parallel to the first direction. The connecting shaft is connected to the generator. The main wind turbine and Archimedes wind turbine are located on the connecting shaft. The generator converts the mechanical energy transmitted by the main wind turbine into electrical energy output. The blades of the Archimedes wind turbine extend helically along the axis of the connecting shaft. The rotation direction of the Archimedes wind turbine is the same as that of the main wind turbine. When the main wind turbine rotates, the Archimedes wind turbine and the main wind turbine rotate synchronously around the same rotation axis. The Archimedes wind turbine generates a braking torque opposite to the output torque of the main wind turbine when the main wind turbine's rotational speed exceeds its rated speed.

[0006] In one or more of the above optional embodiments, the Archimedes wind turbine is located within the wake region, which is cylindrical in shape, and along the first direction, the length of the wake region is equal to the maximum diameter of the nacelle. The radius of the wake region is equal to the maximum radius of the nacelle. The axis of the wake region coincides with the axis of rotation, and the blade tip of the main rotor is coplanar with the starting end face of the wake region.

[0007] In one or more of the above optional embodiments, the helix equation of the Archimedes wind turbine satisfies:

[0008] in, Let be the radial coordinate of the helix of the Archimedes wind turbine. Let be the rotation angle of a point on the helix of the Archimedes wind turbine about its axis of rotation. Let be the axial coordinate of the helix of the Archimedes wind turbine. The maximum radius of the Archimedes wind turbine. The distance between the leading edge of the Archimedes wind turbine and the starting end face of the wake region along the first direction. The installation angle for the Archimedes wind turbine. The rated speed of the main wind turbine, satisfy: , The angle of attack of the Archimedes wind turbine blades. This is the critical tip speed ratio of the Archimedes wind turbine. satisfy: , The optimal tip speed ratio for the main wind turbine. Along the first direction, the distance from the starting end face of the wake region on the rotation axis. Wind speed at the location, satisfy: , The central velocity deficit coefficient, To recover the feature length of the velocity, To ignore the influence of the nacelle and only consider the influence of the main rotor on the incoming flow, along the first direction, the distance between the rotation axis and the starting end face of the wake region is... Wind speed at the location, satisfy: , For free-flowing wind speed, The main wind turbine thrust coefficient, The wake expansion coefficient is... Main rotor radius, The pitch of the Archimedes wind turbine. satisfy: , The solidity of the Archimedes wind turbine blades. This represents the number of blades on the Archimedes wind turbine.

[0009] In one or more of the above optional embodiments, the maximum radius of the cabin is , = .

[0010] In one or more of the above optional implementations, Also satisfies: .in, The installation angle is at the starting point of the spiral of the Archimedes wind turbine. , The installation angle is at the end of the spiral of the Archimedes wind turbine. , This is the radial distance from a point on the helix of the Archimedes windmill to the axis of rotation.

[0011] In one or more of the above optional embodiments, the helix of the Archimedes wind turbine is arranged around the axis of the connecting shaft, and the radius of the Archimedes wind turbine blades gradually increases along the first direction.

[0012] In one or more of the above optional embodiments, the Archimedes wind turbine has three blades, and the blades of the three Archimedes wind turbines are evenly spaced around the axis of the connecting shaft.

[0013] In one or more of the above optional embodiments, the convex surface of the Archimedes wind turbine blades is oriented toward the first direction, and the convex surface of the Archimedes wind turbine blades is an arc-shaped curved surface.

[0014] In one or more of the above optional embodiments, the convex surface of the Archimedes wind turbine blades is provided with a layer of abrasive particles.

[0015] In one or more of the above alternative embodiments, a layer of abrasive particles covers the convex surface of the Archimedes wind turbine blades.

[0016] In one or more of the above optional embodiments, the surface roughness range of the abrasive particle layer is [range missing]. .

[0017] In one or more of the above optional embodiments, a diffuser is included. The diffuser is provided with an air duct that passes through the diffuser along a first direction. The air duct includes an air inlet and an air outlet arranged sequentially along the first direction. One end of the diffuser with the air inlet is sleeved on the Archimedes wind turbine. The diffuser and the Archimedes wind turbine are coaxially arranged. The diffuser is connected to a connecting shaft. When the connecting shaft rotates, the connecting shaft drives the diffuser to rotate synchronously with the Archimedes wind turbine around the rotation axis.

[0018] In one or more of the above optional embodiments, the diffuser includes a housing and a mounting bracket. The air duct is disposed in the housing. The mounting bracket includes a mounting shaft and a support rod. Along a first direction, the connecting shaft and the mounting shaft are arranged in sequence. One end of the mounting shaft is connected to the end of the connecting shaft away from the nacelle. The axis of the mounting shaft coincides with the axis of the connecting shaft. One end of the support rod is connected to the mounting shaft, and the other end of the support rod is connected to the housing.

[0019] In one or more of the above optional embodiments, the cross-sectional area of ​​the air duct gradually increases along the first direction.

[0020] In one or more of the above optional embodiments, the maximum radius of the Archimedes wind turbine is The diameter of the air inlet is , The diameter of the air outlet is... , The diffusion angle of the diffuser is , .

[0021] According to a second aspect of this application, a wind power generation system is provided, including the aforementioned wind power generation device and energy storage device, wherein the energy storage device is connected to the nacelle.

[0022] The beneficial effects of this application embodiment are as follows: The wind power generation device provided in this application embodiment is arranged in sequence along the first direction X by the nacelle, the main wind turbine, and the Archimedes wind turbine. Along the first direction, the Archimedes wind turbine is located in the area behind the nacelle and the main wind turbine, and the rotation direction of the Archimedes wind turbine is the same as the rotation direction of the main wind turbine. When the main wind turbine speed exceeds the rated speed, the Archimedes wind turbine automatically generates a reverse braking torque to brake the main wind turbine. There is no need to set up an additional complex braking mechanism. It will not have the problems of mechanical brake friction pad wear and high temperature braking force attenuation, nor will it have the defects of complex pitch and yaw braking structures, high cost, and uneven force. At the same time, it does not rely on the power grid and power electronic equipment. It can still achieve normal braking when the power grid fails, which improves the reliability of the wind power generation device and reduces production and maintenance costs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0024] Figure 1 A schematic diagram of a wind power generation device provided in an embodiment of this application; Figure 2 A schematic diagram of the Archimedes wind turbine of a wind power generation device provided in this application, viewed along a first direction; Figure 3 A schematic diagram of an Archimedes wind turbine for a wind power generation device provided in an embodiment of this application; Figure 4 A schematic diagram of the nacelle and main rotor of a wind power generation device provided for an embodiment of this application; Figure 5A schematic diagram of the reference plane where the blade tip of the main rotor of a wind power generation device and the starting end face of the wake region are located, as provided in an embodiment of this application. Figure 6 A schematic diagram of the projection of a single blade of an Archimedes wind turbine of a wind power generation device along a first direction X, provided for an embodiment of this application; Figure 7 A schematic diagram of the projection of all blades of an Archimedes wind turbine of a wind power generation device provided in an embodiment of this application along the first direction X; Figure 8 A power-speed curve comparison diagram of a wind power generation device obtained through simulation experiment is provided for an embodiment of this application; Figure 9 A schematic diagram of an Archimedes wind turbine for another wind power generation device provided in an embodiment of this application; Figure 10 A schematic diagram showing the relative positions of the Archimedes wind turbine and the diffuser in another wind power generation device provided in an embodiment of this application; Figure 11 This is a schematic diagram of an energy storage device provided in an embodiment of this application. Detailed Implementation

[0025] To facilitate understanding of this application, a more detailed description is provided below with reference to the accompanying drawings and specific embodiments. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected" to another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," "inner," "outer," and similar expressions used in this specification are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the application. The term "and / or" as used in this specification includes any and all combinations of one or more of the associated listed items.

[0027] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0028] Please see Figures 1 to 3In some embodiments, the wind power generation device 100 includes an Archimedes rotor 1, a nacelle 2, a main rotor 3, and a connecting shaft 4. The nacelle 2, the main rotor 3, and the Archimedes rotor 1 are arranged sequentially along a first direction X. The nacelle 2 includes a nacelle housing and a generator, with the generator located inside the nacelle housing. The connecting shaft 4 is connected to the nacelle 2 and is arranged parallel to the first direction X. The connecting shaft 4 is connected to the generator. The main rotor 3 and the Archimedes rotor 1 are located on the connecting shaft 4. The generator is used to convert the mechanical energy transmitted by the main rotor 3 into electrical energy output. The blades 11 of the Archimedes rotor 1 extend helically along the axis of the connecting shaft 4. The rotation direction of the Archimedes rotor 1 is the same as that of the main rotor 3. When the main rotor 3 rotates, the Archimedes rotor 1 and the main rotor 3 rotate synchronously around the same rotation axis z1. The Archimedes rotor 1 is used to generate a braking torque opposite to the output torque of the main rotor 3 when the rotational speed of the main rotor 3 exceeds the rated speed.

[0029] In this embodiment, the main impeller 3 rotates in the same direction as the incoming flow. The blades of the main impeller 3 rotate around the rotation axis z1. In this embodiment, the incoming flow direction is the first direction X. The Archimedes impeller 1 is divided into a left-handed and a right-handed impeller. The method of determination is that the thumb must point in the direction of the airflow, while the other four fingers follow the spiral line h of the Archimedes impeller 1 from the outside towards the axis. If the right hand matches, it is a right-handed impeller; if the left hand matches, it is a left-handed impeller. "The rotation direction of the Archimedes impeller 1 is the same as the rotation direction of the main impeller 3" means that, for example... Figure 2 and Figure 3 As shown, when Archimedes windmill 1 is a right-handed windmill, when viewed along the first direction X, the corresponding rotation direction of the main windmill 3 is to the right (clockwise) when viewed along the first direction X; when Archimedes windmill 1 is a left-handed windmill, the corresponding rotation direction of the main windmill 3 is to the left (counterclockwise) when viewed along the first direction X.

[0030] Taking Archimedes' rotor 1 as a right-handed rotor as an example, during operation, the airflow direction is the same as the first direction X. Observing along the first direction X, the main rotor 3 rotates clockwise under the drive of the airflow, and Archimedes' rotor 1 rotates clockwise with the connecting shaft 4. Archimedes' rotor 1 is located in the combined wake of the main rotor 3 and the nacelle 2 and is coaxially fixed and rotates with the main rotor 3. When the rotational speed of the main rotor 3 exceeds the rated speed, the increase in the tip tangential velocity of Archimedes' rotor 1 is greater than the increase in the wake velocity. The helical surface of Archimedes' rotor 1 changes from a passively driven state to an actively pushing airflow state. The airflow generates a reaction force on the helical surface opposite to the direction of rotation, thereby forming a negative torque and achieving braking of the main rotor 3.

[0031] The wind power generation device 100 provided in this application embodiment is arranged in sequence along a first direction X, consisting of a nacelle 2, a main wind turbine 3, and an Archimedes wind turbine 1. Along the first direction X, the Archimedes wind turbine 1 is located in the area behind the nacelle 2 and the main wind turbine 3, and the rotation direction of the Archimedes wind turbine 1 is the same as that of the main wind turbine 3. When the rotation speed of the main wind turbine 3 exceeds the rated speed, the Archimedes wind turbine 1 automatically generates a reverse braking torque to brake the main wind turbine 3. There is no need to set up an additional complex braking mechanism, which avoids the problems of mechanical brake friction pad wear and high temperature braking force attenuation, and also avoids the defects of complex pitch and yaw braking structures, high cost, and uneven force distribution. At the same time, it does not rely on the power grid and power electronic equipment, and can still achieve normal braking when the power grid fails, thereby improving the reliability of the wind power generation device 100 and reducing production and maintenance costs.

[0032] In some embodiments, the helix h of the Archimedes wind turbine 1 is arranged around the axis of the connecting shaft 4, and the radius of the blades 11 of the Archimedes wind turbine 1 gradually increases along the first direction X. Here, "the helix h of the Archimedes wind turbine 1 is arranged around the axis of the connecting shaft 4" means that, as... Figure 2 As shown, the process of moving from the starting point h1 of the spiral to the ending point h2 of the spiral involves rotating 360° around the axis of the connecting shaft 4.

[0033] In some embodiments, the Archimedes wind turbine 1 has three blades 11, and the three Archimedes wind turbine 1 blades 11 are evenly spaced around the axis of the connecting shaft 4. For example... Figure 2 As shown, the blades 11 of the three Archimedes wind turbines 1 are arranged at intervals of 120° around the axis of the connecting shaft 4.

[0034] In some embodiments, the convex surface 111 of the blade 11 of the Archimedes wind turbine 1 is oriented toward the first direction X, and the convex surface 111 of the blade 11 of the Archimedes wind turbine 1 is an arc-shaped curved surface.

[0035] Please see Figure 1 , Figure 4 and Figure 5 In some embodiments, the Archimedes wind turbine 1 is located within the wake region A, which is cylindrical in shape and extends along the first direction X. The length L1 of the wake region A is equal to the maximum diameter of the nacelle 2. The radius r1 of the wake region A is equal to the maximum radius of cabin 2. The axis of the wake region A coincides with the rotation axis z1, and the tip 31 of the main rotor 3 is coplanar with the starting end face m of the wake region A. For example... Figure 4 and Figure 5As shown, the blade tip 31 of the main rotor 3 and the starting end face m of the wake region A are both located within the reference plane M1, which is perpendicular to the first direction X. Within the wake region A, the airflow velocity is relatively low, which helps to ensure that the increase in the tangential velocity at the blade tip of the Archimedes rotor 1 is greater than the increase in the wake velocity. This makes it easier for the Archimedes rotor 1 to enter a braking state, thus improving its braking effect.

[0036] Please see Figures 1 to 4 In some embodiments, the helix equation h of Archimedes windmill 1 is expressed in cylindrical coordinates, and the helix equation h of Archimedes windmill 1 satisfies:

[0037] in, Let h be the radial coordinate of the helix. Let be the rotation angle of a point on the helix h about the axis of rotation. Let h be the axial coordinate of the helix. The maximum radius of Archimedes wind turbine 1 Let m be the distance between the leading edge of the Archimedes wind turbine 1 and the starting end face m of the wake region A along the first direction X. The mounting angle for Archimedes Windmill 1. This is the rated speed of the main wind turbine 3. The geometry of the Archimedes wind turbine 1 is determined by its installation angle. The distance in the first direction X between the leading edge of Archimedes wind turbine 1 and the starting end face m of the wake region A. and the rated speed of the main wind turbine 3 Determined jointly. At the installation angle Unchanged, that is, with the Archimedes wind turbine 1 remaining unchanged, make Follow Adjustments will be made.

[0038] satisfy:

[0039] in, The angle of attack of the blades of Archimedes Wind Turbine 1 It is the critical tip speed ratio of Archimedes wind turbine 1.

[0040] satisfy:

[0041] in, The optimal tip speed ratio for the main impeller 3. Along the first direction X, the rotation axis z1 is at a distance m from the starting end face m of the wake region A. Wind speed at the location, For the free flow of wind speed.

[0042] Within the wake region A, the airflow is relatively uniformly distributed across a cross-section perpendicular to the first direction X. satisfy:

[0043] in, To ignore the influence of the nacelle 2 and only consider the influence of the main rotor 3 on the incoming flow, along the first direction X, the distance between the rotation axis z1 and the starting end face m of the wake region A is... Wind speed at the location, The center velocity deficit coefficient is set to 0.9. To recover the feature length of the velocity, The method was obtained through experimental calibration. Specifically, under the influence of the wake of the nacelle 2 and without the main rotor 3, a wind speed sensor was placed at a certain point along the first direction X, at a distance from the nacelle 2, to measure the wind speed at that point. Then, the wind speed at that point, the incoming wind speed, and the center velocity deficit coefficient were substituted into the formula to calculate the wind speed. Velocity recovery feature length The experimental calibration method is the calibration method commonly used in this field, which can be understood by those skilled in the art, so it will not be described in detail here.

[0044] satisfy:

[0045] in, The thrust coefficient of the main wind turbine is 3. Due to the characteristics of wind turbines, different wind turbines have their own corresponding thrust coefficients, and the specific design point value can be selected according to the actual situation. The wake expansion coefficient is used; for example, in some embodiments, the wind power generation device 100 is applied onshore. The value is 0.07. In some other embodiments, It can also be calibrated based on actual measurements. The radius of the main wind turbine 3, The pitch of Archimedes windmill 1.

[0046] satisfy:

[0047] in, The blade solidity of Archimedes wind turbine 1 The number of blades in Archimedes wind turbine 1.

[0048] Based on the application environment and design parameters of the wind power generation device 100, the required radius of the main wind turbine 3 is determined. Maximum radius of cabin 2 Free-flow wind speed The maximum radius of Archimedes wind turbine 1 The number of blades of Archimedes wind turbine 1 The installation angle of Archimedes windmill 1 The solidity of the blades of Archimedes wind turbine 1 The pitch of Archimedes wind turbine 1 The critical tip speed ratio of Archimedes wind turbine 1 The value of is then substituted into equations (1) to (7) above to finally calculate the rated speed of the matching main wind turbine 3. The distance between the leading edge of Archimedes wind turbine 1 and the starting end face of the wake region A in the first direction X .

[0049] Please see Figure 2 , Figure 6 and Figure 7 In some embodiments, 1≤ ≤1.5. For example, in some embodiments, Taking 1.3, the total projected area of ​​the Archimedes wind turbine 1 blades is 1.3 times the swept area 1a. Here, the total projected area of ​​the blades is the sum of the individual projected areas of each blade 11 of the Archimedes wind turbine 1 along the first direction X on the reference plane M2, where the reference plane M2 is perpendicular to the first direction X. Figure 6 The diagram shows the projection 11a of one blade 11 of the Archimedes wind turbine 1 onto the reference plane M2. When the Archimedes wind turbine 1 has three blades 11, the total projected area of ​​the blades is the sum of the areas of the projections of the three blades 11 onto the reference plane M2. The swept area 1a of the blades is equal to the projection of the entire assembly of all the blades 11 of the Archimedes wind turbine 1 onto the reference plane M2, as shown below. Figure 7 As shown. During braking of the Archimedes wind turbine 1, the negative torque originates from the active thrust of the blades 11 of the Archimedes wind turbine 1 on the airflow. The higher the blade, the larger its total projected area, the stronger its interaction with the airflow, and the greater its braking power. After increasing to a certain level, the braking force will tend to saturate (aerodynamic interference between blades intensifies, and the effective projected area no longer increases linearly). Therefore, this leads to... This helps to improve braking power while avoiding excessive aerodynamic interference between blades, reducing unnecessary material waste, and controlling the overall structural weight.

[0050] In some embodiments, the number of blades of Archimedes wind turbine 1 Choosing 3, the Archimedes wind turbine 1 has 3 blades, which has the advantages of good dynamic balance and stable aerodynamic characteristics.

[0051] In some embodiments, blade angle of attack The corresponding value can be selected according to the actual wind conditions, and -5°, -6°, -7° and -8° can be selected respectively according to different levels of turbulence intensity.

[0052] In some embodiments, the maximum radius of cabin 2 is , = Archimedes' windmill radius 1 The size is positively correlated with the braking force; the radius of the Archimedes windmill is 1. and the maximum radius of cabin 2 Equal force is beneficial for Archimedes windmill 1 to have a large braking force while reducing interference with the normal airflow of the main windmill 3.

[0053] For the wind power generation device 100 that satisfies the above equations (1) to (7), when the actual speed of the main wind turbine 3 is equal to the rated speed, that is, when it is about to exceed the critical point, the power of the Archimedes wind turbine 1 is equal to 0 and the Archimedes wind turbine 1 idles; when the actual speed of the main wind turbine 3 is less than the rated speed, the power of the Archimedes wind turbine 1 is greater than 0 and it is in a positive torque auxiliary acceleration state; when the actual speed of the main wind turbine 3 is greater than the rated speed, the power of the Archimedes wind turbine 1 is negative and the Archimedes wind turbine 1 outputs braking power and is in a negative torque braking state. Archimedes wind turbine 1 has the ability to adaptively adjust its power output state according to the rotational speed of the main wind turbine 3. When the actual rotational speed of the main wind turbine 3 is lower than the rated speed, Archimedes wind turbine 1 outputs positive torque to assist in accelerating the main wind turbine 3, which helps to shorten the unit start-up time and improve the wind energy capture efficiency in low wind speed ranges. When the actual rotational speed of the main wind turbine 3 reaches the critical point of the rated speed, the power of Archimedes wind turbine 1 automatically returns to zero and enters the idling state. When the actual rotational speed of the main wind turbine 3 exceeds the rated speed, Archimedes wind turbine 1 automatically switches to braking mode and outputs negative torque to apply braking force to the main wind turbine 3, which helps to improve the smoothness of the transition from positive torque assist acceleration state to negative torque braking state and reduce the ineffective power confrontation between Archimedes wind turbine 1 and the main wind turbine 3. The wind power generation device 100 that satisfies the above equations (1) to (7) can achieve passive full-condition adaptive adjustment of the main wind turbine speed by relying solely on its own physical characteristics. This is beneficial to improving the power generation efficiency and operational stability of the wind power generation device 100, and reducing the complexity of the control system and maintenance costs.

[0054] Figure 8 A power-speed curve comparison diagram obtained through simulation experiment of a wind power generation device 100 that satisfies the above equations (1) to (7) provided in the embodiments of this application. Wherein, the radius of the main wind turbine 3... ; Cabin radius 2 Free-flowing wind speed Archimedes windmill radius 1 The number of blades of Archimedes wind turbine 1 The installation angle of Archimedes windmill 1 The solidity of the blades of Archimedes wind turbine 1 The pitch of Archimedes wind turbine 1 Critical tip speed ratio of Archimedes wind turbine 1 ; Velocity recovery feature length ; Main wind turbine thrust coefficient wake expansion coefficient The angle of attack of the blades of Archimedes wind turbine 1 Rated speed of main impeller 3 Calculations show that when the rated speed of the main wind turbine 3 is... hour, The distance between the Archimedes wind turbine 1 and the starting end face m of the wake region A is... .from Figure 8 As can be seen from this, when the rated speed of the main wind turbine 3 is... At that time, Archimedes rotor 1 was in an idling state; when the rated speed of main rotor 3 increased to At that time, the braking power of Archimedes windmill 1 began to increase rapidly.

[0055] In some embodiments, Also satisfies:

[0056] in, Let h1 be the installation angle at the starting point h1 of the helix h of the Archimedes windmill 1. , The installation angle is at the end point h2 of the spiral h of the Archimedes windmill 1. , Let be the radial distance from a point on the helix h of the Archimedes windmill 1 to the axis of rotation z1. When the value is fixed, the linear velocity at each point on the helix h of the Archimedes wind turbine 1 is different during rotation, thus the actual tip speed ratio at each point is different. The wind power generation device 100 provided in this application embodiment satisfies equations (1) to (8), and the installation angle of the Archimedes wind turbine 1 is... The blades are distributed radially in a parabolic pattern to ensure that the tip speed ratio is the same at all points on the helix h of the Archimedes wind turbine 1. This allows all points on the helix h of the Archimedes wind turbine 1 to be simultaneously in an auxiliary acceleration or braking state, reducing the need for fixed... In the embodiment with fixed values, the torque at various points on the Archimedes wind turbine 1 cancels each other out, which improves the wind energy utilization efficiency and thus helps to improve the braking effect and auxiliary acceleration effect of the Archimedes wind turbine 1.

[0057] Please see Figure 1 and Figure 9 In some embodiments, the convex surface 111 of the blades 11 of the Archimedes wind turbine 1 is provided with a layer of abrasive particles 1111. For example Figure 9 In the Archimedes wind turbine 1, the convex surface 111 of the blade 11 faces the first direction X. By providing a frosted particle layer 1111 on the convex surface 111 of the blade 11 of the Archimedes wind turbine 1, it is beneficial to delay airflow separation and improve the auxiliary acceleration effect when in the auxiliary acceleration state. The frosted particle layer 1111 also increases the frictional resistance on the surface of the blade 11, which is beneficial to enhance the braking effect of the Archimedes wind turbine 1 on the main wind turbine 3 when the main wind turbine 3 is overspeeding.

[0058] In some embodiments, the surface roughness range of the abrasive particle layer 1111 is [range missing]. This is beneficial to improve the flow state of airflow on the surface of the blades 11 of the Archimedes wind turbine 1 to a large extent, so as to delay airflow separation and avoid excessively large particles causing inertial separation of airflow, making it difficult for airflow to adhere to the surface of the blades 11 of the Archimedes wind turbine 1, thereby reducing the auxiliary acceleration and braking effects of the Archimedes wind turbine 1.

[0059] In some embodiments, the abrasive particle layer 1111 covers the convex surface 111 of the blade 11 of the Archimedes windmill 1.

[0060] In some embodiments, the abrasive particle layer 1111 is formed by spraying.

[0061] Please see Figure 1 and Figure 10 In some embodiments, the wind power generation device 100 includes a diffuser 5. The diffuser 5 has an air duct that runs through it along a first direction X. The air duct includes an air inlet 511 and an air outlet 512 arranged sequentially along the first direction X. One end of the diffuser 5 with the air inlet 511 is fitted onto the Archimedes wind turbine 1. The diffuser 5 and the Archimedes wind turbine 1 are coaxially arranged. The diffuser 5 is connected to a connecting shaft 4. When the connecting shaft 4 rotates, it drives the diffuser 5 to rotate synchronously with the Archimedes wind turbine 1 around a rotation axis z1. By setting the diffuser 5, more airflow is induced to pass through the swept area of ​​the Archimedes wind turbine 1, which helps to improve the braking power of the Archimedes wind turbine 1 in braking mode and the output power in auxiliary acceleration mode.

[0062] In some embodiments, the diffuser 5 includes a housing 51 and a mounting bracket 52. An air duct is disposed in the housing 51. The mounting bracket 52 includes a mounting shaft 521 and a support rod 522. Along the first direction X, the connecting shaft 4 and the mounting shaft 521 are arranged in sequence. One end of the mounting shaft 521 is connected to the end of the connecting shaft 4 away from the nacelle 2. The axis of the mounting shaft 521 coincides with the axis of the connecting shaft 4. One end of the support rod 522 is connected to the mounting shaft 521, and the other end of the support rod 522 is connected to the housing 51.

[0063] In some embodiments, the mounting bracket 52 is located entirely within the air duct, one end of the support rod 522 is connected to the inner wall of the air duct, and the other end of the support rod 522 is connected to the outer surface of the mounting shaft 521.

[0064] In some embodiments, there are multiple support rods 522, which are arranged at equal intervals around the axis of the mounting shaft 521.

[0065] In some embodiments, the diffuser 5 has one end with an air inlet 511 fitted onto the maximum radius of the Archimedes windmill 1.

[0066] In some embodiments, the cross-sectional area of ​​the air duct gradually increases along the first direction X. The cross-section of the air duct is perpendicular to the first direction X.

[0067] In some embodiments, the diameter of the air inlet 511 is , .

[0068] In some embodiments, the diameter of the air outlet 512 is , .

[0069] In some embodiments, the diffusion angle of the diffuser 5 is , .

[0070] Please see Figure 1 and Figure 11 Based on the same inventive concept, this application also provides a wind power generation system, including the wind power generation device 100 and energy storage device 200 in any of the above embodiments, wherein the energy storage device 200 is connected to the nacelle 2.

[0071] In some embodiments, the cabin 2 includes a cabin cover and a generator disposed within the cabin cover.

[0072] In some embodiments, the energy storage device 200 includes a rectifier 201 and a battery pack 202. The generator is electrically connected to the rectifier 201, and the rectifier 201 is connected to the battery pack 202. The alternating current generated by the wind power generation device 100 is rectified by the rectifier 201 and stored in the battery pack 202.

[0073] In some embodiments, the energy storage device 200 includes a filter 203 disposed between the input terminals of the rectifier 201 and the battery pack 202.

[0074] In some embodiments, the energy storage device 200 includes an inverter 204 connected to a battery pack 202. The DC power provided by the battery pack 202 is converted into AC power by the inverter 204 to supply AC loads.

[0075] In some embodiments, the energy storage device 200 includes a control board 205 and a boost converter 206. The boost converter 206 is disposed on the input side of the battery pack 202 and is connected to the control board 205. The boost converter 206 is used to receive control signals from the controller motherboard to match the voltage and charge the battery pack 202.

[0076] In some embodiments, the energy storage device 200 includes a first relay 207, which is disposed on the input side of the battery pack 202 and connected to the control board 205. When the battery pack 202 is fully charged, the control board 205 controls the first relay 207 to disconnect.

[0077] In some embodiments, the energy storage device 200 includes a second relay 208, which is disposed on the output side of the battery pack 202 and connected to the control board 205. When the battery pack 202 is undervoltage, the control board 205 controls the second relay 208 to disconnect.

[0078] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A wind power generation device, characterized in that, include: Archimedes' windmill; The nacelle and the main wind turbine are arranged sequentially along a first direction. The nacelle includes a nacelle shell and a generator, and the generator is located inside the nacelle shell. A connecting shaft is provided, which is parallel to the first direction and is connected to the generator. The main wind turbine and the Archimedes wind turbine are located on the connecting shaft. The generator is used to convert the mechanical energy transmitted by the main wind turbine into electrical energy output. The blades of the Archimedes wind turbine are spirally extended along the axis of the connecting shaft. The Archimedes wind turbine rotates in the same direction as the main wind turbine. When the main wind turbine rotates, the Archimedes wind turbine and the main wind turbine rotate synchronously around the same axis of rotation. The Archimedes wind turbine is used to generate a braking torque that is opposite to the output torque of the main wind turbine when the speed of the main wind turbine exceeds the rated speed.

2. The wind power generation device according to claim 1, characterized in that, The Archimedes wind turbine is located within the wake region, which is cylindrical in shape. Along the first direction, the length of the wake region is equal to the maximum diameter of the nacelle. The radius of the wake region is equal to the maximum radius of the nacelle. The axis of the wake region coincides with the rotation axis, and the blade tip of the main impeller is coplanar with the starting end face of the wake region.

3. The wind power generation device according to claim 2, characterized in that, The helix equation of the Archimedes windmill satisfies: in, Let be the radial coordinate of the helix of the Archimedes wind turbine. Let be the rotation angle of a point on the helix of the Archimedes windmill about the axis of rotation. Let be the axial coordinate of the helix of the Archimedes windmill. The maximum radius of the Archimedes wind turbine is given. The distance between the leading edge of the Archimedes wind turbine and the starting end face of the wake region along the first direction. The installation angle of the Archimedes wind turbine. The rated speed of the main wind turbine. satisfy: , The angle of attack of the blades of the Archimedes wind turbine. This is the critical tip speed ratio of the Archimedes wind turbine. satisfy: , The optimal tip speed ratio of the main wind turbine is... Along the first direction, the distance from the starting end face of the rotation axis to the wake region Wind speed at the location, satisfy: , The central velocity deficit coefficient, To recover the feature length of the velocity, To ignore the influence of the nacelle and only consider the influence of the main rotor on the incoming flow, along the first direction, the distance between the rotating axis and the starting end face of the wake region is... Wind speed at the location, satisfy: , For free-flowing wind speed, The main wind turbine thrust coefficient, The wake expansion coefficient is... The radius of the main wind turbine is... The pitch of the Archimedes wind turbine is given. satisfy: , The blade solidity of the Archimedes wind turbine is given. The number of blades of the Archimedes wind turbine.

4. The wind power generation device according to claim 3, characterized in that, The maximum radius of the cabin is , = .

5. The wind power generation device according to claim 3, characterized in that, Also satisfies: ; in, The installation angle is the angle at the starting point of the spiral of the Archimedes wind turbine. , The installation angle at the end of the spiral of the Archimedes wind turbine. . , The radial distance from a point on the helix of the Archimedes windmill to the axis of rotation.

6. The wind power generation device according to claim 1, characterized in that, The helix of the Archimedes wind turbine is arranged around the axis of the connecting shaft, and the radius of the blades of the Archimedes wind turbine gradually increases along the first direction.

7. The wind power generation device according to claim 6, characterized in that, The Archimedes wind turbine has three blades, which are evenly spaced around the axis of the connecting shaft.

8. The wind power generation device according to claim 1, characterized in that, The convex surface of the blades of the Archimedes wind turbine is oriented towards the first direction, and the convex surface of the blades of the Archimedes wind turbine is an arc-shaped curved surface.

9. The wind power generation device according to any one of claims 1-8, characterized in that, The convex surface of the blades of the Archimedes wind turbine is provided with a layer of abrasive particles.

10. The wind power generation device according to claim 9, characterized in that, The abrasive particle layer covers the convex surface of the Archimedes windmill blades.

11. The wind power generation device according to claim 9, characterized in that, The surface roughness range of the abrasive particle layer is: .

12. The wind power generation device according to any one of claims 1-8, characterized in that, The device includes a diffuser with an air duct that extends through the diffuser along a first direction. The air duct includes an air inlet and an air outlet arranged sequentially along the first direction. One end of the diffuser with the air inlet is fitted onto the Archimedes wind turbine. The diffuser and the Archimedes wind turbine are coaxially arranged. The diffuser is connected to a connecting shaft. When the connecting shaft rotates, it drives the diffuser to rotate synchronously with the Archimedes wind turbine around the rotation axis.

13. The wind power generation device according to claim 12, characterized in that, The diffuser includes a housing and a mounting bracket. The air duct is disposed in the housing. The mounting bracket includes a mounting shaft and a support rod. Along the first direction, the connecting shaft and the mounting shaft are arranged sequentially. One end of the mounting shaft is connected to the end of the connecting shaft away from the nacelle. The axis of the mounting shaft coincides with the axis of the connecting shaft. One end of the support rod is connected to the mounting shaft, and the other end of the support rod is connected to the housing.

14. The wind power generation device according to claim 12, characterized in that, Along the first direction, the cross-sectional area of ​​the air duct gradually increases.

15. The wind power generation device according to claim 12, characterized in that, The maximum radius of the Archimedes windmill is The diameter of the air inlet is , ; The diameter of the air outlet is , ; The diffusion angle of the diffuser is , .

16. A wind power generation system, characterized in that, It includes a wind power generation device and an energy storage device as described in any one of claims 1-15, wherein the energy storage device is connected to the nacelle.

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