Wind power generation equipment and yaw control method thereof

Abstract

The present invention discloses a wind power generation equipment and a yaw control method thereof, wherein the wind power generation equipment comprises: an interconnected power generation system, a control and energy storage system, and a yaw system; the power generation system comprises an accelerating vortex tube, a rectifier and at least two fans, the rectifier device is installed in the accelerating vortex tube and is located in front of the fan, and the at least two fans are installed in the accelerating vortex tube at intervals along the length direction of the accelerating vortex tube; the control and energy storage system is used to store the electric energy generated by the power generation system, and under predetermined conditions, is used to control the yaw of the yaw system to drive the power generation system to rotate. The present invention can fully adapt to remote and harsh environments such as polar regions and islands, is easy to install, has a long annual power generation time, high power generation efficiency, and high safety, and is very suitable for wind power generation in areas with frequent extreme wind speeds.

Description

Technical Field

[0001] The present invention relates to the field of wind power technology, and in particular to a wind power generation equipment and a yaw control method thereof suitable for use in harsh environments such as polar regions, and is suitable for use in special areas with frequent extreme wind speeds, high turbulence, great maintenance difficulty, and difficult logistical supply. Background Art

[0002] Under the existing technical conditions, there are three main energy acquisition solutions in polar regions with harsh climate, raging snow and wind, and insufficient logistical supplies, namely diesel power generation, photovoltaic power generation, and wind power generation. Diesel power generation is currently the most widely used form of power generation in polar regions. It has the advantages of high reliability, stable output, and on-demand adjustment. However, diesel power generation must use fuel as a medium. It is necessary to establish supporting oil storage facilities in polar regions and require supply ships to shuttle regularly for oil supply. It will face problems such as fuel solidification, route blockage, and oil and gas leakage. The waste gas and waste generated during fuel power generation will also cause further damage to the fragile ecological environment of the polar regions and are being abandoned. The main advantage of photovoltaic power generation is that it is environmentally friendly, but its efficiency is limited, it occupies a huge area, and once it enters the polar night working conditions, the photovoltaic generator set will basically be in a long-term shutdown state. Not only will it not provide electricity, but it will become a load that consumes electricity. In contrast, the wind power generation solution can effectively coordinate the advantages of both. High-speed winds prevail in the polar regions all year round, and the wind direction is stable, making them ideal locations for building wind farms. Wind turbines only need to be installed once to generate sustainable electricity, without the need for repeated resupply from scientific research vessels. Wind turbines are not affected by the polar night and have a stable power supply. In addition, wind power generation does not produce carbon emissions throughout the entire process and is environmentally friendly to the polar regions. Based on this, wind energy, a "specialty" of the polar regions, has gradually come into the academic community's attention. In the polar regions, severe cold causes high-pressure belts to dominate the area, and the prevailing polar easterly winds turn the two polar regions into "wind reservoirs" and "wind poles", where the advantages of wind energy are more significant; the annual average wind speed in the Antarctic is above 17m / s, and level 12 storms are very frequent; the wind speed in the Arctic is relatively milder than in the Antarctic, but the annual average wind speed can reach 10m / s, and strong winds above 15m / s are relatively rare; the polar regions are not only rich in wind energy resources, but also widely distributed, with technically exploitable amounts of about 100 billion kilowatts, accounting for 20% of the world's onshore wind energy resources; the Arctic's wind energy and the equatorial photovoltaics are collectively known as "one pole and one road", and the Antarctic is even known as the "world's wind pole".

[0003] However, the current wind power scheme in polar regions also faces many hidden dangers. First of all, although stable high-speed wind is the dream working condition of wind turbines, the wind speed in the Antarctic region is too high, and strong winds above level 8 will rage for 300 days every year, and extreme wind speeds are frequent. Australia's Mawson Station recorded an ultra-high wind speed of 82m / s in 1972, and France's D'Irville Station observed a gust of 100 meters per second, which is equivalent to 3 times the level 12 typhoon and the highest wind speed recorded in the world so far. At present, the shutdown wind speed of onshore wind turbines is generally 20m / s and 25m / s at sea, which cannot adapt to polar working conditions. Such high wind speeds will blow down the wind turbines. If wind turbines are used in wintering workstations such as Zhongshan Station, personnel can still be organized for emergency repairs; once they are used in inland workstations such as Kunlun Station, they can only be handled when the summer scientific expedition personnel return, which will seriously affect the energy supply of the scientific expedition station in the long winter, and is not good for astronomical, geomagnetic and other observation equipment that are still in operation. Secondly, there are 33 species and about 65 million birds in the Antarctic region, including rare species such as the "wandering albatross". The towering wind turbines are easy to involve flying creatures when working, which not only threatens the lives of birds, but also affects the safety of the wind turbines themselves. Finally, the layout of the wind turbines requires that the distance between two wind turbines is at least 3-4 times the diameter of the impeller. The use of too dispersed layout in polar regions will greatly increase the difficulty and cost of installation and maintenance. Furthermore, the strong winds in the polar regions carry a large amount of ice crystals and sand particles, and the turbulence is high, which causes huge loads on the wind turbine blades and poses a safety hazard. With the increasing number of activities such as polar scientific research, it is inevitable that the energy supply and wind turbine power will also increase, which will cause a significant increase in the height and blade length of the wind turbine unit. As a result, the wind load on the unit will also increase rapidly, which is easy to cause structural overturning and power supply accidents.

[0004] In summary, the current onshore wind power generation technology cannot be directly migrated to the polar regions. How to provide wind power generation technology suitable for harsh environments such as the polar regions has become a problem that needs to be solved urgently.

[0005] The disclosure of the above background technology content is only used to assist in understanding the concept and technical solution of the present invention. It does not necessarily belong to the prior art of this patent application. In the absence of clear evidence that the above content has been disclosed on the filing date of this patent application, the above background technology should not be used to evaluate the novelty and creativity of the present application. Summary of the invention

[0006] In order to solve the above technical problems, the present invention proposes a wind power generation equipment and a yaw control method thereof, which can be applied to harsh environments such as polar regions.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] The present invention discloses a wind power generation equipment, comprising: a power generation system, a control and energy storage system, and a yaw system which are interconnected; the power generation system comprises an accelerating vortex tube, a rectifying device and at least two fans, the rectifying device is installed in the accelerating vortex tube and is located in front of the fan, and the at least two fans are installed in the accelerating vortex tube at intervals along the length direction of the accelerating vortex tube; the control and energy storage system is used to store the electric energy generated by the power generation system, and under predetermined conditions, is used to control the yaw of the yaw system to drive the power generation system to rotate.

[0009] Furthermore, the accelerating vortex includes a funnel-shaped air inlet and a throat, the front end of the throat is connected to the narrow end of the funnel-shaped air inlet, the bottom surface of the funnel-shaped air inlet and the bottom surface of the throat are located in the same horizontal plane, the rear end of the throat serves as an air outlet, and the rectifying device is installed in the throat and close to the front end of the throat.

[0010] Preferably, the funnel-shaped air inlet is a square funnel-shaped air inlet, and the throat is a square straight pipe.

[0011] Furthermore, the rectifying device is a honeycomb structure grid composed of a plurality of tubular parts; the length of the rectifying device is 0.4-1 times of the equivalent diameter of the throat.

[0012] Furthermore, the yaw system includes an anemometer, a yaw bearing, a worm, a drive motor, a guide rail and a plurality of supporting rollers; the anemometer is arranged at the air inlet of the accelerating vortex tube and is connected to the control and energy storage system; the power generation system and the control and energy storage system both fall on the yaw bearing; the yaw bearing is meshed with the worm, the drive motor is connected to the worm, and is electrically connected to the control and energy storage system, and the plurality of supporting rollers are installed on the bottom surface of the accelerating vortex tube and fall in the guide rail; the control and energy storage system controls the drive motor to drive the worm to rotate according to the wind direction and wind speed measured by the anemometer, and the worm drives the yaw bearing to rotate, and finally drives the power generation system to rotate in the horizontal plane.

[0013] Furthermore, the power generation system also includes a filter, which is arranged in the accelerating vortex and located between the rectifying device and the first windward wind turbine of the at least two wind turbines.

[0014] Preferably, the distance between the filter and the rectifier is between 300 mm and 1200 mm; the distance between the first windward fan and the filter is between 1000 and 2500 mm.

[0015] Furthermore, the power generation system also includes a slide and a rigid base corresponding to the number of the wind turbines, the slide is arranged on the inner side of the bottom of the accelerating vortex, and the tower of one of the wind turbines is detachably installed on a corresponding rigid base, and the rigid base falls into the slide and can slide and be rigidly fixed in the slide.

[0016] Furthermore, the fan is a horizontal axis fan, and the wind wheel of the latter fan rotates in the opposite direction to that of the former fan; preferably, there are three fans.

[0017] Furthermore, a normally closed door is provided on the accelerating vortex tube.

[0018] The present invention also discloses a yaw control method for a wind power generation device as described in any one of the above, comprising the following steps:

[0019] S1. receiving in real time the wind speed and wind direction information of the wind farm where the wind power generation equipment is located;

[0020] S2, performing first-order or second-order low-pass filtering on the wind speed and wind direction information to obtain smooth and stable wind speed and wind direction angle;

[0021] S3, calculating the yaw error angle, where the yaw error angle refers to the difference between the wind direction angle obtained in step S2 and the north angle of the wind turbine generator system;

[0022] S4, compare the wind speed obtained in step S2 with the extreme wind speed threshold, if the wind speed ≥ the extreme wind speed threshold, execute step S5, if the wind speed < the extreme wind speed threshold, execute step S6 or S7:

[0023] S5, starting yaw, controlling the yaw system to yaw and driving the power generation system to rotate until a first yaw end target is reached;

[0024] S6. If the angular amplitude of the yaw error angle is ≤8°, it is considered that the wind turbine is still in a correct wind-facing state and does not need to be yawed;

[0025] S7. If the yaw error angle has an angle amplitude greater than 8°, start yaw, control the yaw system to yaw and drive the power generation system to rotate until a second yaw termination target is reached.

[0026] Furthermore, step S5 comprises the following steps:

[0027] S51, starting yaw, controlling the yaw system to yaw and drive the power generation system to rotate;

[0028] S52, after starting the yaw for a predetermined time, repeating steps S1-S3, if the yaw error angle reaches 82°-98°, then ending the yaw, if the yaw error angle still does not reach 82°-98°, then repeating steps S51-S52, until the yaw error angle reaches 82°-98° or it is determined that there is a system failure, then ending the yaw;

[0029] The step S7 comprises the following steps:

[0030] S71, if the yaw error angle amplitude is greater than 8°, start yaw, control the yaw system to yaw and drive the power generation system to rotate;

[0031] S72. After starting the yaw for a predetermined time, repeat steps S1-S3. If the yaw error angle amplitude is ≤8°, end the yaw. If the yaw error angle amplitude is >8°, repeat steps S71-S72 until the yaw error angle amplitude is ≤8° or it is determined as a system failure, and end the yaw.

[0032] Preferably, the predetermined time refers to 1.5 to 2 times of the theoretical yaw time, and the theoretical yaw time is obtained by dividing the theoretical yaw error angle by the yaw speed.

[0033] Compared with the prior art, the beneficial effects of the present invention are as follows: the wind power generation equipment and the yaw control method thereof proposed by the present invention connect at least two fans in series into the accelerating vortex tube, and use a simple structure to complete the collection, acceleration and rectification of wind resources, thereby improving the fluid quality in the accelerating vortex tube (relatively constant flow direction, low turbulence, and small and few vortices), so as to generate electricity with high-speed and high-quality wind, and, because the fan of the present invention is constrained by the outer wall of the accelerating vortex tube, the wake velocity is faster than the wake of the fan in the traditional open space, so the present invention can reduce the fan spacing to achieve the same output power; the present invention uses a yaw system to drive the power generation system to rotate under predetermined conditions, so that under extreme wind speeds, the equipment can be yawed as a whole to a direction roughly orthogonal to the wind direction, so as to achieve wind shelter from the wind and ensure the safety of the core equipment, and when the wind direction changes, the direction of the power generation system can be adjusted in real time to improve the power generation efficiency. Due to the relatively closed design (the accelerating vortex tube is closed all year round except for the air inlet and outlet), the equipment protects the safety of flying organisms to the maximum extent and can fully adapt to the power generation needs in polar regions. The present invention is particularly suitable for use in special areas where extreme wind speeds occur frequently, turbulence is high, maintenance is difficult, and logistical supply is difficult. For example, it can be applied to remote mountainous areas, islands and other areas where extreme weather occurs frequently, providing a stable source of energy for scientific research and garrison personnel far away from the base camp.

[0034] In a further embodiment, the present invention also has the following beneficial effects:

[0035] (1) The present invention has strong adaptability. It can be deployed on a large scale to provide energy for places with a large number of people, such as scientific research stations and garrison stations. It can also be designed in a small or medium scale to provide power support for scattered households in remote mountainous areas. It can also be transferred from land to sea and connected to marine engineering modules including but not limited to offshore hydrogen production, seawater desalination, and marine ranches to play an auxiliary role.

[0036] (2) The present invention uses the Venturi principle to accelerate the fluid through an accelerating volute composed of a gradually shrinking structure of the air inlet cross section and a straight throat. In an external breeze of 1-2 m / s, the traditional fan has not yet reached the cut-in wind speed, while the fan in the throat can already start to generate electricity efficiently, greatly extending the annual power generation hours, improving power generation capacity, and shortening the payback period.

[0037] (3) The present invention makes full use of the relatively closed accelerating vortex tube structure, and a honeycomb structure grid is installed at the front end, which can disperse larger vortices, reorganize the wind field flow direction, and significantly reduce the fluid turbulence. The filter screen further dissipates the remaining pulse kinetic energy and effectively intercepts the particles carried by the wind under severe working conditions, avoiding the fan blades from encountering fluid-solid coupling conditions. This design can fully reduce the blade load, reduce maintenance costs, and extend the life of the equipment.

[0038] (4) The present invention can yaw as a whole under extreme wind speeds and protect the wind turbine in a nearly windless closed space, thereby reducing blade design requirements and tower strength requirements and cutting costs.

[0039] (5) The present invention can use a low-power (power within 10KW) high-speed fan with a rated full-power wind speed of 15-30m / s, and greatly reduce the size of the impeller and other fan structures, thereby reducing costs and achieving higher power with smaller sizes. The design of the rear horizontal axis fan with the opposite direction to the front horizontal axis fan can cleverly utilize the wake torque generated by the front fan to improve the overall power generation efficiency of the series fan group.

[0040] (6) The present invention is a ground-level structure with a relatively low height and a relatively small windward area, which can significantly reduce wind loads. Different from the tall towers of traditional wind turbines, the present invention can reduce the tower height, is less likely to produce a flow-around effect, and can effectively suppress adverse movements such as vortex-induced vibrations, thus having good structural safety.

[0041] (7) The present invention is different from the micro-wind power generation technology such as INVELOX. The accelerating vortex tube of the present invention adopts a square (quadrilateral cross-section) funnel-shaped air inlet and a square throat design. The bottom surface of the air inlet and the bottom surface of the throat are located at the same horizontal plane, which has the following advantages: first, the air inlet and the throat adopt a square design, which reduces the processing difficulty, improves the space utilization rate, and avoids the situation that the wind duct is blocked when the fan rotates at high speed, thereby improving the power generation efficiency of the unit; secondly, the lower bottom surface of the air inlet and the lower bottom surface of the throat are located at the same horizontal plane, which can reduce the overall center of gravity of the structure, save costs and improve equipment safety; thirdly, it is found through research that if Figure 1 As shown in FIG. 1 , the conventional trumpet-shaped air outlet does not improve the wake quality, and forms a negative pressure area at the upper part, causing the external fluid to rush in and stimulate vortices, forming turbulence, and affecting the efficiency of the unit; while the present invention removes the rear bell mouth and adopts a straight-through design, which greatly improves the wake quality and is not easy to form turbulence, such as Figure 2 As shown, it also greatly saves costs while reducing overall weight and size, making it easier to transport and install.

[0042] (8) The present invention places the fan in a relatively closed accelerating volute, and the rotation of the wind wheel will not pose a threat to flying creatures such as birds. The operating noise can be effectively isolated and will not interfere with surrounding creatures, which has positive ecological significance.

[0043] (9) The present invention has an active yaw function. When the wind direction at the work site changes at a large angle, especially when the wind direction changes repeatedly with the seasons, the power generation system can accurately face the wind, thereby increasing the annual power generation hours. When extreme wind speeds occur, the yaw system can quickly yaw the accelerating vortex tube to a direction roughly orthogonal to the main wind direction, protecting the generator set in the accelerating vortex tube where there is almost no wind, greatly enhancing the equipment's self-sustaining ability and environmental adaptability, and significantly reducing subsequent maintenance costs.

[0044] (10) The auxiliary yaw system including supporting rollers and yaw tracks installed in the present invention can effectively share the load, prevent the rigid base from producing large-scale deformation, and improve the stability and yaw capability of the yaw system.

[0045] (11) The invention has small wake interference (such as Figure 2 As shown in the figure, the equipment has a regular appearance, which is suitable for large-scale and dense layout in a plane, and can also be arranged in layers in space to achieve the ultimate goal of "small and medium-sized units, winning by quantity". BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a schematic diagram of the wake condition of a traditional trumpet-shaped air outlet;

[0047] Figure 2 Schematic diagram of the wake flow in a preferred embodiment of the present invention in which the throat is designed as a straight-through type;

[0048] Figure 3 is a flow chart of a yaw control method for a wind power generation device according to a preferred embodiment of the present invention;

[0049] Figure 4 It is a structural schematic diagram of a small and medium-sized vortex wind power device according to a specific embodiment of the present invention;

[0050] Figure 5 yes Figure 4 A top view of

[0051] Figure 6 yes Figure 4 The main view;

[0052] Figure 7 yes Figure 4 A three-dimensional diagram of the power generation system in. DETAILED DESCRIPTION

[0053] In order to make the technical problems, technical solutions and beneficial effects to be solved by the embodiments of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0054] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can be directly on the other component or indirectly on the other component. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. In addition, connection can be used for both fixing and circuit connection.

[0055] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0057] In order to solve the difficulties of the prior art, the present invention provides a small and medium-sized wind power generation equipment that is particularly suitable for harsh environments such as the polar regions. It is easy to install, has a long annual power generation hour, high power generation efficiency, high structural safety, high wind energy utilization rate, low cost per kilowatt-hour, small wake interference between equipment, and has positive ecological significance such as low noise and harmlessness to flying organisms. The potential for large-scale networking contained in it can solve the energy dilemma of remote areas around the world, including but not limited to the polar regions, peaks, islands, etc., where extreme working conditions are frequent and supply is difficult, support my country and even all mankind to continuously conquer and explore the "human forbidden zone", and provide a clean and stable source of electricity for scientific expedition personnel, garrison officers and soldiers, etc.

[0058] A preferred embodiment of the present invention discloses a wind power generation equipment, comprising: an interconnected power generation system, a control and energy storage system, and a yaw system; wherein the power generation system comprises an accelerating vortex, a rectifier and at least two fans, the rectifier is installed in the accelerating vortex and is located in front of the fan, and at least two fans are installed in the accelerating vortex at intervals along the length direction of the accelerating vortex; the control and energy storage system is used to store the electrical energy generated by the power generation system, and under predetermined conditions, is used to control the yaw of the yaw system to drive the power generation system to rotate.

[0059] The control and energy storage system includes a control cabinet, several energy storage boxes and several wires.

[0060] The accelerating vortex tube includes a funnel-shaped air inlet and a throat. The front end of the throat is connected to the narrow end of the funnel-shaped air inlet. The bottom surface of the funnel-shaped air inlet and the bottom surface of the throat are located at the same horizontal plane. The rear end of the throat serves as an air outlet. The rectifying device is installed in the throat and close to the front end of the throat. The rectifying device is a honeycomb structure grid composed of a plurality of tubular members, for example, it can be composed of a plurality of smaller tubular units with equal cross-sections (hexagonal, square, etc.); the length of the rectifying device is 0.4-1 times the equivalent diameter of the throat. In some embodiments, the funnel-shaped air inlet is a square funnel-shaped air inlet, and the throat is a square straight tube. The power generation system collects wind energy resources through the funnel-shaped air inlet at the front end of the accelerating vortex tube, completes the initial rectification of the fluid, and can achieve an increase in wind speed based on the Venturi principle. The larger vortices contained in the fluid are divided into smaller vortices in the rectification device (a honeycomb structure grid composed of a number of tubular parts in this embodiment), and the chaotic flow direction is rectified into a straight flow direction, and the turbulence of the fluid is significantly reduced. After that, it flows to the filter screen preferably arranged in the power generation system, providing the fan with high-speed, high-quality wind for power generation.

[0061] The main body of the accelerating vortex tube is a thin-walled steel structure with a wall thickness of 8-20mm. A normally closed door is also provided on the accelerating vortex tube; specifically, normally closed doors are provided on the top and sides of the accelerating vortex tube, wherein the size of the normally closed door on the top needs to meet the hoisting requirements of the fan, and the size of the normally closed door on the side needs to meet the entry and exit requirements of maintenance personnel. Between the end of the rectifier and the filter screen set up in the power generation system, a small normally closed door is provided at the bottom of each side wall of the accelerating vortex tube to clean up ice crystals, sand and other particles that are intercepted at the bottom of the filter screen.

[0062] The predetermined conditions include: extreme wind speed (wind speed ≥ extreme wind speed threshold (e.g. 30m / s)) or non-extreme wind speed but the angular amplitude of the yaw error angle is greater than 8°, or maintenance is required. Preferably, under the predetermined conditions, the control and energy storage system controls the yaw system to yaw and drive the power generation system to rotate, which means: under extreme wind speed (wind speed ≥ extreme wind speed threshold (e.g. 30m / s)) or when maintenance is required, the power generation system is controlled to rotate to a direction roughly orthogonal to the wind direction (i.e., the yaw error angle is 82°-98°); or when the wind speed is less than the extreme wind speed threshold (e.g. 30m / s)) and the angular amplitude of the yaw error angle is greater than 8°, the power generation system is controlled to rotate to a yaw error angle ≤8°.

[0063] In a further embodiment, a plurality of low-power (with a power of less than 10KW) fans are located inside the throat, and the number can be determined according to the actual local wind energy situation; a plurality of low-power fans are arranged in series along the length direction of the throat; the low-power fans are all high-speed fans, with a rated full-speed wind speed of 15-30m / s, and can be vertical axis fans or horizontal axis fans, or can be used in combination, for example, vertical axis fans can be arranged in series, or vertical axis fans and horizontal axis fans can be arranged in a mixed manner (when there are at least two horizontal axis fans, the wind rotor of the latter horizontal axis fan and the wind rotor of the former horizontal axis fan are in the opposite direction), preferably, all horizontal axis fans are selected, and the wind rotor of the latter fan and the wind rotor of the former fan are in the opposite direction. In one embodiment, there are 3 fans. A plurality of low-power fans are arranged in series, and the high-speed, high-quality wind in the accelerating vortex tube is used to generate electricity, and the wake is discharged through the rear end of the throat.

[0064] The power generation system may also include a filter screen, which is arranged in the accelerating vortex and located between the rectifier and the first windward wind turbine of the at least two wind turbines; in some embodiments, the distance between the filter screen and the rectifier is between 300mm and 1200mm; the distance between the first windward wind turbine and the filter screen is between 1000 and 2500mm. The rigidity of the filter screen itself is very large and not easy to deform. The size of the grid unit therein depends on the environmental conditions, for example, it can be 3-5mm. The filter screen can further dissipate the pulse kinetic energy of the fluid, improve the quality of the fluid in the throat, and filter out ice crystals, sand and other particles carried by the fluid, thereby reducing the load on the blades of the low-power wind turbine.

[0065] The power generation system may also include a slide and a rigid base corresponding to the number of fans, the slide is arranged on the inner side of the bottom of the accelerating vortex tube, and the tower of a fan is detachably mounted on a corresponding rigid base, the rigid base falls in the slide, and can slide and be rigidly fixed in the slide. In one embodiment, the length of the slide ranges from the filter screen to the end of the accelerating vortex tube. By making the fan slide in the slide, the fan can be easily installed or repaired through a normally closed door respectively arranged on the top and side of the accelerating vortex tube. As an alternative to the slide and the rigid base, normally closed doors can also be opened on the top and side of the accelerating vortex tube corresponding to each fan, and the installation or maintenance of the fan can also be achieved through the opened normally closed doors.

[0066] The yaw system includes an anemometer, a yaw bearing, a worm, a drive motor, a guide rail and a number of supporting rollers; wherein the anemometer is arranged at the air inlet of the accelerating vortex tube and is connected to the control and energy storage system; the power generation system and the control and energy storage system both fall on the yaw bearing, the yaw bearing has a large self-rigidity and is not easy to deform; the yaw bearing is meshed with the worm, the drive motor is connected to the worm, and is electrically connected to the control and energy storage system through a number of wires, a number of supporting rollers are installed on the bottom surface of the accelerating vortex tube and fall in the guide rail, when the yaw operation is performed, the support rollers roll in the guide rail, share the load and assist in completing the yaw operation; the control and energy storage system controls the drive motor to drive the worm to rotate according to the wind direction and wind speed measured by the anemometer, and the worm drives the yaw bearing to rotate, and finally drives the power generation system to rotate in the horizontal plane. In this embodiment, the yaw system adopts a rotary drive, the wind speed and direction meter identifies and returns the wind field information, and then the control and energy storage system processes the information and issues a yaw command. The yaw system identifies the yaw command and generates yaw power to drive the power generation system to rotate in the horizontal plane. During the rotation, a number of support rollers roll on the guide rails to share the load, prevent the power generation system from deforming, and assist in completing the yaw wind operation. Among them, the number of support rollers and guide rails is determined differently according to factors such as the weight of the equipment.

[0067] The wind power generation equipment provided by the above preferred embodiment can be applied to harsh areas such as polar regions with an annual average wind speed of 7-12 m / s and an extreme wind speed of 80-100 m / s.

[0068] In the wind power generation equipment provided by the preferred embodiment of the present invention, the funnel-shaped air inlet collects the wind into the throat to complete acceleration and preliminary rectification, and the subsequent rectification device reduces the turbulence of the wind and corrects the flow direction; after flowing through the filter, the pulse kinetic energy of the wind is further reduced, and solid particles such as ice crystals and sand are peeled off, and finally drives multiple series units at the throat to generate electricity; the yaw system adopts a rotary drive, assisted by rollers and guide rails. Under normal wind speeds, the yaw system drives the power generation system to accurately face the wind. Under extreme wind speeds, the yaw system controls the system to yaw to a direction roughly orthogonal to the wind speed to protect the generator set. The generated energy is collected in several energy storage boxes. The present invention can fully adapt to remote and harsh environments such as polar regions and islands, is easy to install, has a long annual power generation time, high power generation efficiency, and high safety. It is very suitable for wind power generation in areas with frequent extreme wind speeds.

[0069] The installation method of the wind power generation equipment provided by the above preferred embodiment includes: welding and assembling all devices except a number of guide rails at a construction plant, hoisting the entire device onto a barge (if the work site is in the polar region, hoisting the device onto an icebreaker), tying them up firmly and transporting them to the port of the installation site, and then transporting them to the installation site by truck; during installation, first laying the guide rails, and then hoisting the wind power generation equipment as a whole, paying attention to the assembly of rollers and guide rails, and the wind turbine is in a braking state during the entire installation process; after the installation is completed, the wind turbine braking state is released, and each system is debugged, and the installation is completed after normal operation.

[0070] The maintenance / inspection method of the power generation system of the wind power generation equipment provided in the above preferred embodiment includes: when the power generation system of the wind power generation equipment needs small-scale maintenance / inspection, the accelerating vortex is actively yawed to a direction roughly orthogonal to the wind direction, and the fan is adjusted to a braking state. At this time, there is almost no wind inside the accelerating vortex, which can fully guarantee the safety of the maintenance personnel. The maintenance personnel can enter the throat through the normally closed hatch on the side of the accelerating vortex to complete the maintenance / inspection of the small-power fan. When the power generation system of the wind power generation equipment needs large-scale maintenance / inspection (such as replacing the fan, etc.), the accelerating vortex is actively yawed to a direction roughly orthogonal to the wind direction, and the fan is adjusted to a braking state, and the normally closed hatch at the top of the accelerating vortex is opened. After the maintenance personnel enter the throat, they slide the problem fan to the bottom of the normally closed hatch at the top through the slideway, and cooperate with the external crane to complete the hoisting and replacement of the problem fan. When extreme wind speeds occur, the yaw system actively yaws the acceleration volute to a direction roughly orthogonal to the wind direction, the fan is adjusted to the braking state, and all normally closed doors remain closed. Maintenance personnel need to regularly clean ice crystals, sand and other particles intercepted by the filter. When cleaning, open the small normally closed door and use the push rod to clear the particles accumulated at the bottom of the filter; if particles are found embedded in the filter, they can be shaken to make them fall off and then cleaned.

[0071] like Figure 3As shown, another preferred embodiment of the present invention discloses the above-mentioned yaw control method of the wind power generation equipment, comprising the following steps:

[0072] S1. Receive wind speed and wind direction information of the wind farm where the wind power generation equipment is located in real time;

[0073] S2, performing first-order or second-order low-pass filtering on the wind speed and wind direction information to obtain smooth and stable wind speed and wind direction angle;

[0074] S3, calculating the yaw error angle, where the yaw error angle refers to the difference between the wind direction angle obtained in step S2 and the north angle of the wind turbine generator system;

[0075] S4, compare the wind speed obtained in step S2 with the extreme wind speed threshold, if the wind speed ≥ the extreme wind speed threshold, execute step S5, if the wind speed < the extreme wind speed threshold, execute step S6 or S7:

[0076] S5, starting yaw, controlling the yaw system to yaw and driving the power generation system to rotate until the first yaw end target is reached;

[0077] Wherein, step S5 specifically includes the following steps:

[0078] S51, start yaw, control the yaw system to yaw and drive the power generation system to rotate;

[0079] S52, after starting the yaw for a predetermined time, repeating steps S1-S3, if the yaw error angle reaches 82°-98°, then ending the yaw, if the yaw error angle still does not reach 82°-98°, then repeating steps S51-S52, until the yaw error angle reaches 82°-98° or it is determined that there is a system failure, then ending the yaw;

[0080] S6. If the yaw error angle is ≤8°, it is considered that the wind turbine is still in the correct wind-facing state and does not need to be yawed;

[0081] S7, if the yaw error angle amplitude is greater than 8°, start yaw, control the yaw system to yaw and drive the power generation system to rotate until the second end yaw target is reached;

[0082] Wherein, step S7 specifically includes the following steps:

[0083] S71, if the yaw error angle amplitude is greater than 8°, start the yaw, control the yaw system to yaw and drive the power generation system to rotate;

[0084] S72. After starting the yaw for a predetermined time, repeat steps S1-S3. If the yaw error angle amplitude is ≤8°, end the yaw. If the yaw error angle amplitude is >8°, repeat steps S71-S72 until the yaw error angle amplitude is ≤8° or it is determined as a system failure, and end the yaw.

[0085] The predetermined time in step S52 and step S72 refers to 1.5 to 2 times of the theoretical yaw time, and the theoretical yaw time is obtained by dividing the theoretical yaw error angle by the yaw speed. Under the yaw of step S5, the theoretical yaw error angle refers to 82°-98°, and under the yaw of step S7, the theoretical yaw error angle refers to the angle amplitude of the yaw error angle calculated in step S3 ≤8°.

[0086] The wind power generation equipment provided by the preferred embodiment of the present invention is further described below in conjunction with specific embodiments.

[0087] This specific embodiment provides a small and medium-sized wind power generation device suitable for harsh environments such as polar regions, and its overall structure is as follows: Figures 4 to 7 As shown, the device includes an interconnected power generation system, a control and energy storage system, and a yaw system. Among them, the power generation system includes an accelerating vortex tube 1 (with several hatches), a honeycomb structure grid 102 for rectification (hereinafter referred to as the rectification grid 102), a filter 103, a slide 106, and several low-power fans 104 (with a power of less than 10KW). The control and energy storage system includes a control cabinet 4, several energy storage boxes 3 and several wires 9. The yaw system includes an anemometer 8, a yaw bearing 7, a worm 5, a drive motor 6, several support rollers 10 and several yaw guide rails 2. The equipment can be used in harsh areas such as polar regions with an annual average wind speed of 7-12m / s and an extreme wind speed of 80-100m / s.

[0088] The main body of the accelerating vortex tube 1 is a steel thin-walled structure with a wall thickness of 8-20mm. The accelerating vortex tube 1 can be divided into two parts: an air inlet 101 and a throat 105. The air inlet 101 is a square funnel-shaped structure, and the throat 105 is a square tube. The lower bottom surface of the air inlet 101 and the lower bottom surface of the throat 105 are in the same horizontal plane. The rectifying grid 102 is a honeycomb structure, which is composed of a number of smaller tubular units of equal cross-section (which can be hexagonal, (quadrilateral) square, etc.). The filter screen 103 is located behind the rectifying grid 102, and the distance from the rectifying grid 102 is between 300mm-1200mm, and the distance between the first fan and the filter screen is 1000-2500mm. The filter screen 103 itself has a large rigidity and is not easy to deform. The size of the grid unit depends on the environmental conditions, and is preferably 3-5mm.

[0089] The power generation system collects wind energy resources through the funnel-shaped air inlet 101 at the front end of the accelerating vortex tube 1, completes the preliminary rectification of the fluid, and realizes the increase of wind speed based on the Venturi principle. The larger vortex contained in the fluid is divided into smaller vortices in the rectifying grid 102, and the chaotic flow direction is rectified into a straight flow direction. The turbulence of the fluid is significantly reduced, and then flows to the filter 103. The filter 103 can further dissipate the pulse kinetic energy of the fluid, improve the quality of the fluid in the accelerating vortex tube 1 (i.e., constant flow direction, low turbulence, small and few vortices), and filter out ice crystals, sand and other particles carried by the fluid, reducing the load on the blades of the low-power fan 104. Multiple low-power fans 104 are arranged in series, and the spacing between the fans 104 is such that they do not interfere with each other. The high-speed, high-quality wind in the throat 105 is used to generate electricity, and the tail flow is discharged through the rear end of the throat 105.

[0090] The yaw bearing 7 is meshed with the worm 5, the drive motor 6 is connected to the worm 5, and is connected to the control and energy storage system through a number of wires 9. The control and energy storage system can control the drive motor 6 to drive the worm 5 to rotate, and the worm 5 drives the yaw bearing 7 to rotate, and finally drives the power generation system to rotate in the horizontal plane. The power generation system and the control and energy storage system fall on the yaw bearing 7 as a whole. The yaw bearing 7 has a large self-rigidity and is not easy to deform. A number of support rollers 10 are installed on the lower edge of the accelerating vortex tube 1 and fall in the yaw guide rail 2. When the yaw operation is performed, the support roller 10 rolls in the yaw guide rail 2, shares the load and assists in completing the yaw operation. The yaw system adopts a rotary drive, the anemometer 8 identifies and returns the wind field information, and then the control and energy storage system processes the information and issues a yaw command. The yaw system identifies the yaw command and generates yaw power to drive the vortex tube wind power equipment to rotate in the horizontal plane. During the rotation, the plurality of support rollers 10 roll on the yaw guide rail 2 to share the load, prevent the turbine wind turbine equipment from deforming, and assist in completing the yaw wind operation. The number of the plurality of support rollers 10 and the plurality of yaw guide rails 2 is determined differently according to factors such as the weight of the equipment.

[0091] Normally closed doors are provided on the top and sides of the accelerating vortex tube 1. The size of the normally closed door 109 on the top needs to meet the hoisting requirements of the fan 104, and the size of the normally closed door 108 on the side needs to meet the entry and exit requirements of maintenance personnel. Between the end of the rectifying grid 102 and the filter screen, a small normally closed door 110 is provided at the bottom of the side wall of the accelerating vortex tube 1 to clean up the ice crystals, sand and other particles that are intercepted at the bottom of the filter screen 103.

[0092] The slide 106 falls on the inner side of the bottom plate of the accelerating vortex tube 1, and the length ranges from the filter 103 to the end of the accelerating vortex tube 1. Multiple fans 104 are located inside the throat 105, and are arranged in series along the length direction of the throat 105. The number of fans depends on the actual local wind energy situation. In this example, there are 3 fans. The small-power fans 104 are all high-speed fans with a rated full-load wind speed of about 20m / s (15-25m / s). They are horizontal-axis fans, and the wind wheel of the latter fan is opposite to that of the previous fan. The tower of each small-power fan 104 falls on its corresponding rigid base 107 and is detachable. The rigid base 107 falls in the slide 106 and can slide and be rigidly fixed in the slide 106.

[0093] The installation method of the small and medium-sized vortex wind power equipment provided in this specific embodiment is: all devices except some yaw guide rails 2 are welded and assembled at the construction plant, and then hoisted onto a barge (if the work site is in the polar region, it is hoisted onto an icebreaker), tied firmly and transported to the port of the installation site, and then transported to the installation site by truck. During installation, first lay the yaw guide rail 2, and then hoist the vortex wind power equipment as a whole, pay attention to the assembly of the roller 10 and the yaw guide rail 2, and the fan 104 is in the brake state during the entire installation process. After the installation is completed, the brake state of the fan 104 is released, and each system is debugged. The installation is completed after normal operation.

[0094] The maintenance / inspection method of small and medium-sized vortex wind power equipment provided in this specific embodiment is: when the power generation system needs small-scale maintenance / inspection, the accelerating volute is actively yawed to a direction roughly orthogonal to the wind direction, and the fan 104 is adjusted to a braking state. At this time, there is almost no wind inside the throat 105, which can fully guarantee the safety of the maintenance personnel. The maintenance personnel can enter the throat 105 through the normally closed hatch on the side to complete the maintenance / inspection of the small-power fan 104. When the power generation system of the small and medium-sized vortex wind power equipment needs large-scale maintenance / inspection (such as replacing the fan, etc.), the accelerating volute is actively yawed to a direction roughly orthogonal to the wind direction, and the fan 104 is adjusted to a braking state, and the normally closed hatch at the top is opened. After the maintenance personnel enter the throat 105, they slide the problem fan to the bottom of the normally closed hatch at the top through the slide 106, and cooperate with the external crane to complete the hoisting and replacement of the problem fan. When extreme wind speeds occur, the yaw system actively yaws the acceleration volute to a direction roughly orthogonal to the wind direction, and the fan 104 is adjusted to a braking state, and all normally closed doors remain closed. Maintenance personnel need to regularly clean up ice crystals, sand particles and other particles intercepted by the filter 103. When cleaning, open the small normally closed door and use the push rod to clear out the particles accumulated at the bottom of the filter 103; if particles are found embedded in the filter 103, they can be shaken to make them fall off and then cleaned.

[0095] like Figure 3 As shown, the above-mentioned yaw control method of the wind power generation equipment includes the following steps:

[0096] S1. Receive wind speed and wind direction information of the wind farm where the wind power generation equipment is located in real time;

[0097] S2, performing first-order or second-order low-pass filtering on the wind speed and wind direction information to obtain smooth and stable wind speed and wind direction angle;

[0098] S3, calculating the yaw error angle, where the yaw error angle refers to the difference between the wind direction angle obtained in step S2 and the north angle of the wind turbine generator system;

[0099] S4, compare the wind speed obtained in step S2 with the extreme wind speed threshold, if the wind speed ≥ the extreme wind speed threshold, execute step S5, if the wind speed < the extreme wind speed threshold, execute step S6 or S7:

[0100] S5, starting yaw, controlling the yaw system to yaw and driving the power generation system to rotate until the first yaw end target is reached;

[0101] Wherein, step S5 specifically includes the following steps:

[0102] S51, start yaw, control the yaw system to yaw and drive the power generation system to rotate;

[0103] S52, after starting the yaw for a predetermined time, repeating steps S1-S3, if the yaw error angle reaches 82°-98°, then ending the yaw, if the yaw error angle still does not reach 82°-98°, then repeating steps S51-S52, until the yaw error angle reaches 82°-98° or it is determined that there is a system failure, then ending the yaw;

[0104] S6. If the yaw error angle is ≤8°, it is considered that the wind turbine is still in the correct wind-facing state and does not need to be yawed;

[0105] S7, if the yaw error angle amplitude is greater than 8°, start yaw, control the yaw system to yaw and drive the power generation system to rotate until the second end yaw target is reached;

[0106] Wherein, step S7 specifically includes the following steps:

[0107] S71, if the yaw error angle amplitude is greater than 8°, start the yaw, control the yaw system to yaw and drive the power generation system to rotate;

[0108] S72. After starting the yaw for a predetermined time, repeat steps S1-S3. If the yaw error angle amplitude is ≤8°, end the yaw. If the yaw error angle amplitude is >8°, repeat steps S71-S72 until the yaw error angle amplitude is ≤8° or it is determined as a system failure, and end the yaw.

[0109] The predetermined time in step S52 and step S72 refers to 1.5 to 2 times of the theoretical yaw time, and the theoretical yaw time is obtained by dividing the theoretical yaw error angle by the yaw speed. Under the yaw of step S5, the theoretical yaw error angle refers to 82°-98°, and under the yaw of step S7, the theoretical yaw error angle refers to the angle amplitude of the yaw error angle calculated in step S3 ≤8°.

[0110] Specifically, the anemometer installed on the top of the air inlet captures the wind speed and direction information of the wind field in real time, but the directly collected information contains a lot of noise. Therefore, in this embodiment, after receiving the wind speed and direction information of the wind field, first-order or second-order low-pass filtering is performed. The first-order low-pass filter transfer function is Where T is the time constant and s is an independent variable in the complex plane. The second-order low-pass filter transfer function is: in, is the natural frequency (or undamped oscillation frequency), is the damping ratio (or relative damping coefficient). The filtering step can remove high-frequency noise and obtain smooth and stable low-frequency wind speed and direction signals.

[0111] After filtering, the wind speed is first determined. If it reaches or exceeds the extreme wind speed threshold (for example, 30m / s), an extreme wind speed warning is triggered, and the device is yawed to a direction roughly orthogonal to the wind direction, and the outer wall of the accelerating vortex tube is used to resist extreme wind loads to protect the core power generation equipment. If it is lower than the extreme wind speed threshold, the yaw error angle (the difference between the wind direction angle and the device's north angle) is calculated: if the yaw error angle has an angle amplitude of ≤8°, it is considered that the device is still in the correct wind-facing state and does not need to be yawed; if the yaw error angle has an angle amplitude of >8°, it is considered that the device can no longer accurately face the wind, and yaw is started. Once a yaw command is issued, after 1.5 to 2 times the theoretical yaw time (the theoretical yaw time is the theoretical yaw error angle (°) divided by the yaw speed (° / s)), the wind speed and direction instrument recaptures the wind field information and filters it. If the yaw target is reached, the yaw is terminated; if the yaw target is not reached, the yaw process is iterated again. If the yaw target is still not reached after three iterations, the yaw is terminated, and the yaw system is considered to have a fault and reported. The yaw targets include the first yaw end target and the second yaw end target. The first yaw end target means that when the extreme wind speed threshold is reached or exceeded, the yaw target is that the yaw error angle reaches 82°-98° (that is, the yaw is roughly orthogonal to the wind direction angle) or it is judged to be a system fault; the rest is the second yaw end target, and the second yaw end target is that the yaw error angle amplitude is ≤8° or it is judged to be a system fault.

[0112] The specific embodiment of the present invention provides a small and medium-sized vortex tube wind power equipment suitable for harsh areas such as the polar regions with an annual average wind speed of 7-12m / s and an extreme wind speed of 80-100m / s in actual engineering. The present invention has strong adaptability, simple installation, long annual power generation hours, high power generation efficiency, high structural safety, high wind energy utilization rate, low cost per kilowatt-hour, small wake interference between equipment, and more positive ecological significance such as low noise and harmlessness to flying organisms. The potential for large-scale networking contained in it can solve the energy dilemma of remote areas around the world, including but not limited to the polar regions, peaks, islands, etc., where extreme working conditions are frequent and supply is difficult. It is very suitable for wind power generation in areas with frequent extreme wind speeds and difficult logistical supply.

[0113] The above content is a further detailed description of the present invention in combination with specific / preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, without departing from the concept of the present invention, it can also make several substitutions or modifications to these described embodiments, and these substitutions or modifications should be regarded as belonging to the protection scope of the present invention. In the description of this specification, the description of reference terms "an embodiment", "some embodiments", "preferred embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily target the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, in the absence of mutual contradiction, the technical personnel in this field can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples. Although the embodiments of the present invention and their advantages have been described in detail, it should be understood that various changes, substitutions and modifications can be made herein without departing from the scope defined by the attached claims.

Claims

1. A wind power generation device, characterized in that: include: Interconnected power generation system, control and energy storage system, and yaw system; The power generation system comprises an accelerating vortex tube, a rectifying device and at least two fans, wherein the rectifying device is installed in the accelerating vortex tube and is located in front of the fans, and the at least two fans are installed in the accelerating vortex tube at intervals along the length direction of the accelerating vortex tube; The control and energy storage system is used to store the electric energy generated by the power generation system, and under predetermined conditions, is used to control the yaw of the yaw system to drive the power generation system to rotate, wherein under predetermined conditions, the control and energy storage system controls the yaw of the yaw system to drive the power generation system to rotate means that: when the wind speed is ≥ the extreme wind speed threshold, the power generation system is controlled to rotate to a yaw error angle of 82°-98°; when the wind speed is < the extreme wind speed threshold and the angle amplitude of the yaw error angle is >8°, the power generation system is controlled to rotate to a yaw error angle of ≤8°.

2. The wind power generation equipment according to claim 1, characterized in that: The accelerating vortex includes a funnel-shaped air inlet and a throat, the front end of the throat is connected to the narrow end of the funnel-shaped air inlet, the bottom surface of the funnel-shaped air inlet and the bottom surface of the throat are located in the same horizontal plane, the rear end of the throat serves as an air outlet, and the rectifying device is installed in the throat and close to the front end of the throat.

3. The wind power generation equipment according to claim 2, characterized in that: The rectifying device is a honeycomb structure grid composed of a plurality of tubular parts; the length of the rectifying device is 0.4-1 times of the equivalent diameter of the throat.

4. The wind power generation equipment according to any one of claims 1 to 3, characterized in that: The yaw system includes an anemometer, a yaw bearing, a worm, a drive motor, a guide rail and a plurality of supporting rollers; The anemometer is arranged at the air inlet of the accelerating vortex tube and is connected to the control and energy storage system; The power generation system and the control and energy storage system are both located on the yaw bearing; The yaw bearing is meshed with the worm, the drive motor is connected to the worm and electrically connected to the control and energy storage system, and the plurality of support rollers are mounted on the bottom surface of the accelerating vortex tube and fall into the guide rail; The control and energy storage system controls the drive motor to drive the worm to rotate according to the wind direction and wind speed measured by the anemometer, and the worm drives the yaw bearing to rotate, and finally drives the power generation system to rotate in the horizontal plane.

5. The wind power generation equipment according to any one of claims 1 to 3, characterized in that: The power generation system further comprises a filter screen, which is arranged in the accelerating vortex tube and located between the rectifying device and the first windward wind turbine of the at least two wind turbines.

6. The wind power generation equipment according to any one of claims 1 to 3, characterized in that: The power generation system also includes a slide and a rigid base corresponding to the number of the wind turbines. The slide is arranged on the inner side of the bottom of the accelerating vortex tube. The tower of one of the wind turbines can be detachably installed on a corresponding rigid base. The rigid base falls into the slide and can slide and be rigidly fixed in the slide.

7. The wind power generation equipment according to any one of claims 1 to 3, characterized in that: The fans are horizontal axis fans, and the wind wheels of the latter fan and the former fan rotate in opposite directions.

8. The wind power generation equipment according to any one of claims 1 to 3, characterized in that: The accelerating vortex tube is also provided with a normally closed door.

9. The wind power generation equipment according to claim 2, characterized in that: The funnel-shaped air inlet is a square funnel-shaped air inlet, and the throat pipe is a square straight pipe.

10. The wind power generation equipment according to claim 5, characterized in that: The distance between the filter and the rectifier is between 300mm and 1200mm; the distance between the first windward fan and the filter is between 1000 and 2500mm.

11. The wind power generation equipment according to claim 7, characterized in that: There are 3 fans.

12. A yaw control method for a wind power generation device according to any one of claims 1 to 11, characterized in that: The steps include: S1. receiving in real time the wind speed and wind direction information of the wind farm where the wind power generation equipment is located; S2, performing first-order or second-order low-pass filtering on the wind speed and wind direction information to obtain smooth and stable wind speed and wind direction angle; S3, calculating the yaw error angle, where the yaw error angle refers to the difference between the wind direction angle obtained in step S2 and the north angle of the wind turbine generator system; S4, compare the wind speed obtained in step S2 with the extreme wind speed threshold, if the wind speed ≥ the extreme wind speed threshold, execute step S5, if the wind speed < the extreme wind speed threshold, execute step S6 or S7: S5, starting yaw, controlling the yaw system to yaw and driving the power generation system to rotate until a first yaw end target is reached; S6. If the angular amplitude of the yaw error angle is ≤8°, it is considered that the wind turbine is still in a correct wind-facing state and does not need to be yawed; S7. If the yaw error angle has an angle amplitude greater than 8°, start yaw, control the yaw system to yaw and drive the power generation system to rotate until a second yaw termination target is reached.

13. The yaw control method according to claim 12, characterized in that: The step S5 comprises the following steps: S51, starting yaw, controlling the yaw system to yaw and drive the power generation system to rotate; S52, after starting the yaw for a predetermined time, repeating steps S1-S3, if the yaw error angle reaches 82°-98°, then ending the yaw, if the yaw error angle still does not reach 82°-98°, then repeating steps S51-S52, until the yaw error angle reaches 82°-98° or it is determined that there is a system failure, then ending the yaw; The step S7 comprises the following steps: S71, if the yaw error angle amplitude is greater than 8°, start yaw, control the yaw system to yaw and drive the power generation system to rotate; S72. After starting the yaw for a predetermined time, repeat steps S1-S3. If the yaw error angle amplitude is ≤8°, end the yaw. If the yaw error angle amplitude is >8°, repeat steps S71-S72 until the yaw error angle amplitude is ≤8° or it is determined as a system failure, and end the yaw.

14. The yaw control method according to claim 13, characterized in that: The predetermined time refers to 1.5 to 2 times of the theoretical yaw time, and the theoretical yaw time is obtained by dividing the theoretical yaw error angle by the yaw speed.

Images