Wind power generation system capable of being directly connected to grid

Abstract

The invention relates to the technical field of wind power generation, in particular to a direct grid-connected wind power generation system, which adopts the following steps: S10, establishing a wind gathering Venturi tube which is a variable Venturi tube and forms an annular throat part; s20, a wind direction tail vane and a steering damper are installed on the wind gathering venturi tube, and system wind direction tracking is stabilized; s30, a wind energy conversion mechanism is built, specifically, a turbine is composed of customized blades, and the turbine and guide blades are arranged on the annular throat portion of a variable Venturi tube to form the efficient wind energy conversion mechanism; s40, mechanical energy of a turbine is efficiently transmitted to an energy storage flywheel through an overrun clutch; s50, a permanent magnet is installed on the energy storage flywheel, and a rotating magnetic field is formed; s60, the induction current of the electromagnetic coil in the rotating magnetic field is transmitted to a high-frequency chopping inverter and an energy storage battery; s70, the high-frequency chopping inverter outputs sine wave alternating current for direct grid connection; the system has the advantages of being high in wind energy utilization rate, low in construction cost, accurate in control, capable of achieving large-scale seamless joint grid-connected power generation and the like.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a wind power generation system that can be directly connected to a grid. Background Art

[0002] Wind energy has been used for thousands of years. Wind energy is energy generated by air movement. It is a renewable and clean energy. However, the use of wind energy is limited by geographical conditions. Only winds with high wind speed, stable wind direction and small amplitude are suitable for wind power stations to generate electricity. Wind power generation has developed in the last few hundred years. Among them, the Dutch wind power generation system is the most famous and has been cited and developed by various countries. However, the above wind power generation has the following unsatisfactory aspects, which are explained as follows: (1) The above-mentioned wind power generation system is represented by a three-blade driven generator. With the same windward area, the windward area of ​​the blades is small, and the wind energy cannot be fully utilized.

[0003] (2) The above-mentioned wind power generation system has a very high construction cost, usually requiring iron towers several tens of meters high and a large foundation area.

[0004] (3) The above wind power generation system requires a heavy speed-up machine.

[0005] (4) The above-mentioned wind turbine systems are generally not equipped with energy storage devices. When the wind power fluctuates, the power output also fluctuates. It is this kind of fluctuating power generation that the power grid cannot bear. This has caused a lot of wind and power abandonment.

[0006] (5) Since the above-mentioned wind power generation system has no energy storage mechanism, when the natural wind is strong, the power grid has to bear a large power impact. When the natural wind is weak, the power grid has to return energy to the generator set to maintain the synchronous speed of the generator, which has resulted in a large area of ​​wind power in my country being shut down.

[0007] (6) The generator, gearbox and blades of the above-mentioned wind power generation system are all installed dozens of meters above the ground, and the center of gravity is unstable. The wind power generation system also has to withstand the lateral thrust during strong winds, so the overall safety factor of the system is not high, and wind power generation system collapse accidents occur from time to time. Summary of the invention

[0008] The purpose of the present invention is to address the defects and shortcomings of the prior art and provide a high-speed, gearbox-free, and highly efficient wind power generation system that can be directly connected to the grid and has a wind-gathering type and an energy storage device, which can smoothly release the stored energy.

[0009] The wind power generation system that can be directly connected to the grid described in the present invention adopts the following steps: S10: Establish a wind-gathering Venturi tube: It is a modified Venturi tube and forms an annular throat; S20: Install wind direction tail rudder and steering damper on the wind-gathering venturi tube to stabilize the wind direction tracking of the system; S30: Establishing a wind energy conversion mechanism: The turbine is composed of customized blades, and the guide blades are placed in the annular throat of the modified venturi tube to form a high-efficiency wind energy conversion mechanism; S40: The overrunning clutch efficiently transmits the mechanical energy of the turbine to the energy storage flywheel; S50: A permanent magnet is installed on the energy storage flywheel to form a rotating magnetic field; S60: Induction current transmission of electromagnetic coils in a rotating magnetic field arrive High frequency chopper inverter and energy storage battery; S70: High-frequency chopper inverter outputs sine wave AC power directly connected to the grid; S80: The electromagnetic coil is switched in series and parallel according to the wind force to adapt to the working voltage range of the high-frequency chopper inverter. The high-frequency chopper inverter further stabilizes the output voltage of the system through chopping pulse width modulation; S90: Several air valves are evenly arranged around the outer side of the wind hood shell, and an anemometer and a PLC microcontroller are installed at the top of the inner wall of the wind hood shell. The power supply of the PLC microcontroller is supplied by the electric energy generated by the power generation of this design. The air intake volume is tested in real time according to the anemometer. When there is extremely strong wind outside, the extremely strong wind is set to level 10. The PLC microcontroller controls the opening of the air valve, which is beneficial to ensure the safety of the equipment and is also convenient for later maintenance.

[0010] Furthermore, the modified venturi tube includes a rotating seat installed on a hillside, a rotating shaft is installed on the top surface of the rotating seat, and an air guide shell is installed on the rotating shaft; one side of the air guide shell is a conical cylindrical wind collecting cover shell, and the other side of the air guide shell is a conical cylindrical diffusion cover shell, and the wind collecting cover shell and the diffusion cover shell form a venturi tube-shaped air guide shell.

[0011] Furthermore, the wind gathering hood shell includes a wind gathering hood outer shell and a wind gathering hood inner shell installed at the inner end of the wind gathering hood outer shell; the diffusion hood shell includes a diffusion hood outer shell and a diffusion hood inner shell installed at the inner end of the diffusion hood outer shell; the wind gathering hood inner shell and the diffusion hood inner shell form an annular throat in the middle of the air guide outer shell.

[0012] Furthermore, the wind energy conversion mechanism includes a rotating shaft installed in the annular throat area, bearings are installed at both ends of the rotating shaft, and two bearings are installed on the two side surfaces of the annular throat area; a plurality of layers of turbine blades are installed on the rotating shaft, and a guide blade for guiding the direction of the fluid is installed between every two turbine blades, and a one-way overrunning clutch is installed between the turbine blades and the rotating shaft to transmit the mechanical energy of the turbine to the energy storage flywheel, and at least two energy storage flywheels are installed in the middle of the rotating shaft.

[0013] Furthermore, the induction coil is mounted on the hub of the guide blade.

[0014] Furthermore, the outer shell of the wind condenser hood is in the shape of a conical cylinder, and the outer end of the outer shell of the wind condenser hood is a cylinder mouth with a large opening; the inner shell of the wind condenser hood is in the shape of a conical cylinder, and the inner end of the inner shell of the wind condenser hood is a cylinder mouth with a large opening.

[0015] Furthermore, a protective net is installed on the outer port of the wind collecting hood shell.

[0016] Furthermore, the outer shell of the diffuser cover is in the shape of a conical cylinder, and the outer end of the outer shell of the diffuser cover is a cylinder mouth with a large opening; the inner shell of the diffuser cover is in the shape of a conical cylinder, and the inner end of the inner shell of the diffuser cover is a cylinder mouth with a large opening.

[0017] Furthermore, a wind direction tail vane is installed at the tail of the diffuser cover shell, and the wind direction tail vane is a T-shaped wind vane, which controls the wind power generation system to always be in a windward state; a steering damper is installed between the rotating beam of the rotating seat and the rotating track beam of the rotating seat to stabilize the steering.

[0018] After adopting the above structure, the beneficial effects of the present invention are as follows: the wind power generation system described in the present invention that can be directly connected to the grid utilizes the natural slope and plane of the hillside and the ground as a wind gathering surface to form a variety of wind gathering mechanisms, similar to a large venturi tube. At the throat of the venturi tube, multiple layers of turbines and airflow guide impellers are arranged, thereby saving the speed change mechanism in the original wind power system; it has the advantages of high wind energy utilization rate, low construction cost, precise control, and can be seamlessly connected to the grid for large-scale power generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application, but do not constitute an improper limitation of the present invention. In the drawings: Figure 1 is a topological schematic diagram of the present invention; Figure 2 It is a schematic diagram of the structure of the present invention; Figure 3 It is an enlarged view of the A part of the present invention; Figure 4 It is a structural schematic diagram of the rotating seat of the present invention; Figure 5 is a schematic diagram of the front structure of the T-shaped wind rudder of the present invention; Figure 6 is a schematic side view of the structure of the T-shaped wind rudder of the present invention; Figure 7 It is a schematic diagram of the structure with an air valve installed in the present invention.

[0020] Description of reference numerals: Wind guide housing-1; rotating seat-2; wind gathering mechanism-3; inverter-4; power grid-5; steering damper-6; wind valve-7. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0023] like Figure 1 As shown, a wind power generation system that can be directly connected to the grid described in this specific embodiment adopts the following steps: S10: Establishing a wind-gathering venturi tube: a modified venturi tube with an annular throat; S20: Install wind direction tail rudder and steering damper on the wind-gathering venturi tube to stabilize the wind direction tracking of the system; S30: Establishing a wind energy conversion mechanism: The turbine is composed of customized blades, and is placed with the guide blade group in the annular throat of the modified venturi tube to form a high-efficiency wind energy conversion mechanism; S40: The overrunning clutch efficiently transmits the mechanical energy of the turbine to the energy storage flywheel; S50: A permanent magnet is installed on the energy storage flywheel to form a rotating magnetic field; S60: Induction current transmission of electromagnetic coils in a rotating magnetic field arrive High frequency chopper inverter and energy storage battery; S70: High-frequency chopper inverter outputs sine wave AC power directly connected to the grid; S80: The electromagnetic coil is switched in series and parallel according to the wind force to adapt to the working voltage range of the high-frequency chopper inverter; the high-frequency chopper inverter further stabilizes the output voltage of the system through chopping pulse width modulation; S90: Several air valves are evenly arranged around the outer side of the wind hood shell, and an anemometer and a PLC microcontroller are installed at the top of the inner wall of the wind hood shell. The power supply of the PLC microcontroller is supplied by the electric energy generated by the power generation of this design. The air intake volume is tested in real time according to the anemometer. When there is extremely strong wind outside, the extremely strong wind is set to level 10. The PLC microcontroller controls the opening of the air valve, which is beneficial to ensure the safety of the equipment and is also convenient for later maintenance.

[0024] Furthermore, the modified venturi tube includes a rotating base 2 installed on a hillside, a rotating shaft is installed on the top surface of the rotating base 2, and an air guide shell 1 is installed on the rotating shaft; one side of the air guide shell 1 is a conical cylindrical wind gathering cover 11, and the other side of the air guide shell 1 is a conical cylindrical diffusion cover 12, and the wind gathering cover 11 and the diffusion cover 12 form a venturi tube-shaped air guide shell.

[0025] Furthermore, the wind gathering hood shell 11 includes a wind gathering hood outer shell 111 and a wind gathering hood inner shell 112 installed at the inner end of the wind gathering hood outer shell 111; the diffusion hood shell 12 includes a diffusion hood outer shell 121 and a diffusion hood inner shell 122 installed at the inner end of the diffusion hood outer shell; the wind gathering hood inner shell 112 and the diffusion hood inner shell 122 form an annular throat 13 in the middle of the air guide outer shell.

[0026] Furthermore, the wind energy conversion mechanism includes a rotating shaft installed in the annular throat area 13, with bearings installed at both ends of the rotating shaft, and two bearings are installed on the two side surfaces of the annular throat area 13; a plurality of layers of turbine blades 33 are installed on the rotating shaft, and a guide blade 35 for guiding the direction of the fluid is installed between every two turbine blades 33, and a one-way overrunning clutch 36 is installed between the turbine blades 33 and the rotating shaft to transmit the mechanical energy of the turbine to the energy storage flywheel 32, and at least two energy storage flywheels 32 are installed in the middle of the rotating shaft.

[0027] Furthermore, the induction coil 37 is mounted on the hub of the guide blade 35 .

[0028] Furthermore, the outer shell 111 of the wind condenser hood is in the shape of a cone-shaped cylinder, and the outer end of the outer shell 111 of the wind condenser hood is a cylinder mouth with a large opening; the inner shell 112 of the wind condenser hood is in the shape of a cone-shaped cylinder, and the inner end of the inner shell 112 of the wind condenser hood is a cylinder mouth with a large opening.

[0029] Furthermore, a protective net is installed on the outer port of the air collecting cover shell 111 to prevent birds or other foreign objects from being sucked in.

[0030] Furthermore, the outer shell 121 of the diffuser cover is in the shape of a conical cylinder, and the outer end of the outer shell 121 of the diffuser cover is a cylinder mouth with a large opening; the inner shell 122 of the diffuser cover is in the shape of a conical cylinder, and the inner end of the inner shell 122 of the diffuser cover is a cylinder mouth with a large opening.

[0031] Furthermore, a wind direction tail rudder 123 is installed at the tail of the diffusion cover shell 121. The wind direction tail rudder 123 is a T-shaped wind rudder, which controls the wind power generation system to always be in a windward state; the steering damper 6 is installed between the rotating beam 23 of the rotating seat 2 and the rotating track beam 22 of the rotating seat 2 to stabilize the system steering.

[0032] Furthermore, the customized blade adopts a special-shaped turbine blade with patent number 202010841952.1, which is a blade patent previously applied for by the inventor and is applied to this product.

[0033] The working principle of the present invention is specifically described as follows: like Figure 2-Figure 3 As shown, in this design, the special-shaped Venturi-type wind gathering device includes a rotating seat 2 installed on the hillside and a wind guide housing 1 installed on the rotating seat 2. The wind guide housing is composed of a wind gathering cover shell and a diffusion cover shell, and the middle part of the wind gathering cover shell and the diffusion cover forms an annular throat area 13. The shape of the wind guide housing is similar to that of a Venturi tube.

[0034] When in use, the product of this design is installed on the top of a mountain. If the wind direction on the top of a mountain is constant, the direction of the wind guide shell of this design can be adjusted, and the wind collecting cover can be directed toward the wind inlet to achieve the wind collecting effect. However, the wind direction of the mountain tops in different locations is variable. Therefore, the wind guide shell of this design is installed on the rotating seat 2, so that the direction and position of the wind collecting cover can be automatically adjusted according to the demand for wind inlet, so as to be synchronized with the wind inlet.

[0035] In order to ensure the wind force with variable directions on the top of the mountain, the wind guide housing is installed on the rotating seat 2, and the rotating seat 2 is installed on the top of the mountain. Figure 5 -As shown in Figure 6, a wind direction tail rudder (T-shaped wind rudder) is installed at the tail of the diffuser shell in this design, and the control system is always in the windward state.

[0036] In this design, if Figure 4 As shown, the steering damper 6 is installed between the rotating beam 23 of the rotating seat 2 and the rotating track beam 22 of the rotating seat 2 to stabilize the system steering. Therefore, when the wind from the top of the mountain comes, the wind guide housing is always in a windward state, so that the wind can be maximized through the wind gathering cover, and the air intake can be maximized on the top of the mountain with variable wind direction.

[0037] When the wind enters the throat area through the wind collecting cover, the incoming wind forms a high-speed airflow, which drives the high-speed operation of the turbine, so that a high-speed airflow is formed at the throat of the venturi tube. The middle part of the rotating shaft 31 in this design is equipped with an energy storage flywheel 32; Figure 3The figure shows two layers of turbines, but in fact, they are multi-layered and the blade angles vary incrementally; therefore, multiple layers of turbine blades 33 can be installed on the rotating shaft 31 of the present design; an airflow guide vane 35 is installed between every two turbine blades 33. The use of the guide vane 35 maximizes the use of the airflow, so that the direction of the airflow passing through the turbine can be controlled, thereby utilizing the turbine to convert wind energy into mechanical energy.

[0038] A one-way overrunning clutch 36 is installed between the turbine blades 33 and the rotating shaft 31 to transmit the wind energy of the turbine to the energy storage flywheel 32 .

[0039] Then, a permanent magnet 34 is installed on the energy storage flywheel 32 to generate a rotating magnetic field, an induction coil 37 is installed in the rotating magnetic field, and the induction coil 37 is installed on the hub of the guide blade 35 to generate an induced current; the induced current is output to the high-frequency chopper inverter 4, and the inverted sinusoidal AC is connected in parallel with the power grid 5 to form a complete power generation system. It saves the speed change mechanism in the original wind power system, while improving the utilization efficiency of wind energy and reducing a large amount of wind abandonment.

[0040] like Figure 7 As shown, in the present design, a number of air valves 7 are evenly arranged around the outer side surface of the wind hood shell 111; an anemometer and a PLC single-chip microcomputer are installed at the top of the inner wall of the wind hood shell 111, and the power supply of the PLC single-chip microcomputer is supplied by the electric energy generated by the power generation of the present design. The PLC single-chip microcomputer is connected to the anemometer and the air valve through a cable, and the wiring is close to the wind hood shell 111, and the wire is wrapped with a waterproof and fireproof layer. When in use, the air volume is measured according to the anemometer, so that the PLC controller can be controlled to open the air valve according to different air volumes. The present design can set a maximum air intake setting. When there is an extremely strong wind outside, the air valve is opened, which is beneficial to ensure the equipment. The setting for extremely strong winds is set according to the level of the typhoon.

[0041] The beneficial effects of the present invention are as follows: (1) In the present invention, in order to solve the problem of low wind energy utilization rate in the original wind power system, the design technology adopts a variety of wind gathering mechanisms according to various specific conditions, using the natural slope and ground plane of the hillside and the ground as a wind gathering surface, and other three surfaces can be made of other materials. The above-mentioned wind gathering structure is similar to a large deformed Venturi tube. At the throat of this Venturi tube, there are multiple layers of turbines, and an airflow guide impeller is arranged in the middle of the multiple layers of turbines. Due to the use of the wind gathering mechanism, a high-speed airflow is formed at the throat of the Venturi tube. This high-speed airflow drives the high-speed operation of the turbine, thereby saving the speed change mechanism in the original wind power system, while improving the utilization efficiency of wind energy and reducing a large amount of wind abandonment.

[0042] (2) In the present invention, in order to solve the problem of high construction cost in the original wind power system, the present design installs the new wind power system on the top of the hill, using the hill as the basic platform of the new wind power system, or directly installs the new wind power system on the ground by means of wind gathering and guiding.

[0043] (3) In the present invention, the new wind power system of this design is equipped with a mechanical flywheel (energy storage flywheel) as the energy storage body of the new wind power system. The turbine and the flywheel are coupled through a one-way overrunning clutch. When the wind is strong, the turbine accelerates the flywheel through the one-way overrunning clutch to do work; when the wind is weak, the turbine is equivalent to being separated from the flywheel, so that there is no need for the flywheel to return energy to the turbine.

[0044] In the present invention, in order to avoid the impact of surge current of the generator set on the power grid when the wind is strong, the new wind power system of the present invention adopts the following measures: (A) This design combines the output windings of the generator sets of the new wind power system in series or in parallel to achieve relative stability of the generator output voltage.

[0045] (B) This design adjusts the magnetic flux of the generator set of the new wind power system to further achieve output voltage stability. The above-mentioned use of magnetic flux to achieve output voltage stability can change the magnetic flux in real time through software. This technology is an existing technology, so this design will not be elaborated in detail.

[0046] (C) This design synchronizes and networks the output of the generator set of the new wind power system with a sinusoidal chopper inverter, ultimately outputting balanced and stable high-quality electricity within a relative time period.

[0047] (D) The new wind power system generator set designed in this paper is uniformly regulated based on the big data of the power grid and the size of the local wind.

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wind power generation system that can be directly connected to the grid, characterized in that: Use the following steps: S10: Establish a wind-gathering Venturi tube: It is a modified Venturi tube and forms an annular throat; S20: Install wind direction tail rudder and steering damper on the wind-gathering venturi tube to stabilize the wind direction tracking of the system; S30: Establishing a wind energy conversion mechanism: The turbine is composed of customized blades, and the guide blades are placed in the annular throat of the modified venturi tube to form a high-efficiency wind energy conversion mechanism; S40: The overrunning clutch efficiently transmits the mechanical energy of the turbine to the energy storage flywheel; S50: A permanent magnet is installed on the energy storage flywheel to form a rotating magnetic field; S60: Induction current transmission of electromagnetic coils in a rotating magnetic field arrive High frequency chopper inverter and energy storage battery; S70: High-frequency chopper inverter outputs sine wave AC power directly connected to the grid; S80: The electromagnetic coil is switched in series and parallel according to the wind force to adapt to the working voltage range of the high-frequency chopper inverter; the high-frequency chopper inverter further stabilizes the output voltage of the system through chopping pulse width modulation; S90: Several air valves are evenly arranged around the outer side of the wind hood shell, and an anemometer and a PLC microcontroller are installed at the top of the inner wall of the wind hood shell. The power supply of the PLC microcontroller is supplied by the electric energy generated by the power generation of this design. The air intake volume is tested in real time according to the anemometer. When there is extremely strong wind outside, the extremely strong wind is set to level 10. The PLC microcontroller controls the opening of the air valve, which is beneficial to ensure the safety of the equipment and facilitates subsequent maintenance.

2. A wind power generation system that can be directly connected to the grid according to claim 1, characterized in that: The modified venturi tube includes a rotating seat installed on a hillside, a rotating shaft is installed on the top surface of the rotating seat, and an air guide shell is installed on the rotating shaft; one side of the air guide shell is a conical cylindrical wind gathering cover shell, and the other side of the air guide shell is a conical cylindrical diffusion cover shell, and the wind gathering cover shell and the diffusion cover shell form an air guide shell in the shape of a venturi tube.

3. A wind power generation system that can be directly connected to the grid according to claim 2, characterized in that: The wind gathering hood shell includes a wind gathering hood outer shell and a wind gathering hood inner shell installed at the inner end of the wind gathering hood outer shell; the diffusion hood shell includes a diffusion hood outer shell and a diffusion hood inner shell installed at the inner end of the diffusion hood outer shell; the wind gathering hood inner shell and the diffusion hood inner shell form an annular throat in the middle of the wind guide outer shell.

4. A wind power generation system that can be directly connected to the grid according to claim 1, characterized in that: The wind energy conversion mechanism includes a rotating shaft installed in the annular throat area, bearings are installed at both ends of the rotating shaft, and two bearings are installed on the two side surfaces of the annular throat area; multiple layers of turbine blades are installed on the rotating shaft, and guide blades for guiding the direction of the fluid are installed between every two turbine blades. A one-way overrunning clutch is installed between the turbine blades and the rotating shaft to transmit the mechanical energy of the turbine to the energy storage flywheel, and at least two energy storage flywheels are installed in the middle of the rotating shaft.

5. A wind power generation system that can be directly connected to the grid according to claim 1, characterized in that: The induction coil is mounted on the hub of the guide blade.

6. A wind power generation system that can be directly connected to the grid according to claim 2, characterized in that: The outer shell of the wind condenser is in the shape of a conical cylinder, and the outer end of the outer shell of the wind condenser is a cylinder mouth with a large opening; the inner shell of the wind condenser is in the shape of a conical cylinder, and the inner end of the inner shell of the wind condenser is a cylinder mouth with a large opening.

7. A wind power generation system that can be directly connected to the grid according to claim 2, characterized in that: A protective net is installed on the air inlet port of the air collecting cover shell.

8. A wind power generation system that can be directly connected to the grid according to claim 2, characterized in that: The outer shell of the diffusion cover is in the shape of a conical cylinder, and the outer end of the outer shell of the diffusion cover is a cylinder mouth with a large opening; the inner shell of the diffusion cover is in the shape of a conical cylinder, and the inner end of the inner shell of the diffusion cover is a cylinder mouth with a large opening.

9. A wind power generation system that can be directly connected to the grid according to claim 1, characterized in that: The wind direction tail rudder is installed at the tail of the diffuser cover shell. The wind direction tail rudder is a T-shaped wind rudder, which controls the wind power generation system to always be in a windward state; the steering damper is installed between the rotating beam of the rotating seat and the rotating track beam of the rotating seat to stabilize the steering.

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