Constant-speed-adjustable wind power generation system and control method thereof

Abstract

The application provides a speed regulating transmission mechanism, a wind power generation system capable of stable speed regulation and a control method thereof, and solves the problems of low power generation efficiency and poor stability of the existing wind power generation system and cost increase caused by adding a frequency converter. The power generation system comprises a wind power tower, a wind paddle, a generator, a controller, a first wind energy transmitter arranged in the wind power tower and at least one set of transmission assembly. Each set of transmission assembly comprises a second wind energy transmitter, a speed regulating unit and a speed stabilizing regulator. The input of the first wind energy transmitter is connected with the rotating shaft of the wind paddle. The input of the second wind energy transmitter is connected with the output of the first wind energy transmitter. The input of the speed regulating unit is connected with the output of the first wind energy transmitter or is provided by an external power grid. The inputs of the speed stabilizing regulator are respectively connected with the output of the second wind energy transmitter and the output of the speed regulating unit, and the output of the speed stabilizing regulator is connected with the input of the generator. The controller collects the output rotating speed of the second wind energy transmitter, adjusts the output rotating speed of the speed regulating unit, and makes the fluctuation range of the output rotating speed of the speed stabilizing regulator less than a set value.

Description

Technical Field

[0001] This invention relates to wind power generation technology, specifically to a wind power generation system with adjustable speed and its control method. Background Technology

[0002] Wind energy is an important renewable and clean energy source with broad development prospects in terms of development value and commercial promotion. A wind power generation system is a type of power machinery that converts wind energy into mechanical energy.

[0003] In existing technologies, wind power generation systems include three important parts: the tower, the nacelle (also known as the tower head), and the wind turbine. The nacelle is located at the top of the tower, and the blades of the wind turbine are connected to the nacelle via a drive shaft. The nacelle contains components such as a speed increaser and a generator, and the drive shaft is connected to the speed increaser. During operation, the blades of the wind turbine rotate under the action of wind load, and the torque is transmitted to the speed increaser through the drive shaft. The speed increaser increases the rotational speed and drives the generator to generate electricity.

[0004] Unstable wind speeds lead to poor wind power stability. One manifestation of this is the wind power system's insufficient ability to cope with grid faults during actual operation. Another manifestation is unstable power generation and frequency, affecting grid connection. To solve this problem, a frequency converter (inverter) is usually installed after the generator to improve power generation quality and facilitate grid connection. However, wind power systems with frequency converters still cannot achieve constant power generation. More importantly, frequency converters are relatively expensive, increasing costs. Summary of the Invention

[0005] To address the technical problems of low power generation efficiency and poor stability in existing wind power generation systems, and the increased costs resulting from adding frequency converters to improve power generation efficiency and frequency stability, this invention provides a wind power generation system with adjustable speed and its control method.

[0006] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0007] A speed-regulating transmission mechanism for transmitting power generated by the wind turbine of a wind power generation system to a generator, characterized in that it includes a first wind energy transmitter, a second wind energy transmitter, a speed regulating unit, a speed regulator, and a controller.

[0008] The power input of the first wind energy transmitter is used to connect to the wind turbine shaft;

[0009] The power input of the second wind energy transmitter is connected to the power output of the first wind energy transmitter;

[0010] The power input of the speed regulating unit is connected to the power output of the first wind power transmitter, or the power input of the speed regulating unit is provided by the external power grid;

[0011] The power input of the speed regulator is connected to the power output of the second wind power transmitter and the power output of the speed regulating unit, respectively.

[0012] The controller is used to collect the output speed of the second wind power transmitter and adjust the output speed of the speed regulating unit in real time according to the collected output speed, so that the output speed fluctuation range of the speed regulator is less than the set value.

[0013] Furthermore, the speed-regulating unit includes a third wind energy transmitter, a speed-regulating generator, and a speed-regulating motor connected in sequence. The power input of the third wind energy transmitter is connected to the power output of the first wind energy transmitter, and the power output of the speed-regulating motor is connected to the power input of the speed regulator.

[0014] Alternatively, the speed-regulating unit includes a speed-regulating motor, which is connected to an external power grid via a driver;

[0015] Alternatively, the speed-regulating unit includes a third wind energy transmitter, a speed-regulating generator, and a speed-regulating motor connected in sequence. The power input of the third wind energy transmitter is connected to the power output of the first wind energy transmitter, and the power output of the speed-regulating motor is connected to the power input of the speed regulator. The speed-regulating motor is connected to the external power grid through a driver.

[0016] Furthermore, the first wind energy transmitter is a hydraulic pump and / or a gas pump, or the first wind energy transmitter is a mechanical transmission mechanism;

[0017] The second wind energy transmitter is a hydraulic motor or a mechanical transmission mechanism;

[0018] The third wind energy transmitter is a hydraulic motor and / or an air motor driven by an air energy storage structure, or the third wind energy transmitter is a mechanical transmission mechanism.

[0019] Furthermore, the hydraulic pump is a piston pump, gear pump, screw pump, or vane pump with a speed increaser, with a piston pump being the most preferred.

[0020] The hydraulic motor is a piston-type hydraulic motor, a gear-type hydraulic motor, or a vane-type hydraulic motor.

[0021] The speed regulator is a planetary gear mechanism, with its sun gear connected to the power output of the second wind power transmitter and its gear ring connected to the power output of the speed regulating unit.

[0022] Meanwhile, this invention provides a wind power generation system with adjustable speed, including a wind turbine tower, wind turbine propellers, a generator, and a controller, which is unique in that:

[0023] It also includes a first wind power transmitter installed inside the wind turbine tower and at least one set of transmission components installed below the wind turbine tower or on the ground outside the wind turbine tower.

[0024] Each transmission assembly includes a second wind power transmitter, a speed regulating unit, and a speed stabilizer.

[0025] The power input of the first wind power transmitter is connected to the rotor shaft of the wind turbine outside the wind turbine tower;

[0026] The power input of the second wind energy transmitter is connected to the power output of the first wind energy transmitter;

[0027] The power input of the speed regulating unit is connected to the power output of the first wind power transmitter, or the power input of the speed regulating unit is provided by the external power grid;

[0028] The power input of the speed regulator is connected to the power output of the second wind power transmitter and the power output of the speed regulating unit, respectively, and its power output is connected to the power input of the generator.

[0029] The controller is used to collect the output speed of the second wind power transmitter and adjust the output speed of the speed regulating unit in real time according to the collected output speed, so that the output speed fluctuation range of the speed regulator is less than the set value.

[0030] Furthermore, the speed-regulating unit includes a third wind energy transmitter, a speed-regulating generator, and a speed-regulating motor connected in sequence. The power input of the third wind energy transmitter is connected to the power output of the first wind energy transmitter, and the power output of the speed-regulating motor is connected to the power input of the speed regulator.

[0031] Alternatively, the speed-regulating unit includes a speed-regulating motor, which is connected to an external power grid via a driver;

[0032] Alternatively, the speed-regulating unit includes a third wind energy transmitter, a speed-regulating generator, and a speed-regulating motor connected in sequence. The power input of the third wind energy transmitter is connected to the power output of the first wind energy transmitter, and the power output of the speed-regulating motor is connected to the power input of the speed regulator. The speed-regulating motor is connected to the external power grid through a driver.

[0033] Furthermore, the first wind energy transmitter is a hydraulic pump and / or a gas pump, or the first wind energy transmitter is a mechanical transmission mechanism;

[0034] The second wind energy transmitter is a hydraulic motor or a mechanical transmission mechanism;

[0035] The third wind energy transmitter is a hydraulic motor and / or an air motor driven by an air energy storage structure, or the third wind energy transmitter is a mechanical transmission mechanism.

[0036] Furthermore, the hydraulic pump is a piston pump, gear pump, screw pump, or vane pump with a speed increaser;

[0037] The hydraulic motor is a piston-type hydraulic motor, a gear-type hydraulic motor, or a vane-type hydraulic motor.

[0038] The speed regulator is a planetary gear mechanism, with its sun gear connected to the power output of the second wind power transmitter and its gear ring connected to the power output of the speed regulating unit.

[0039] Furthermore, an upper oil pipe and a lower oil pipe are installed inside or outside the wind turbine tower;

[0040] The number of the first wind energy transmitters is N, where N is a positive integer; the outlet of each first wind energy transmitter is connected to the lower oil pipe through a corresponding first switching valve, the inlet of each first wind energy transmitter is connected to the upper oil pipe, and a venting circuit is connected between the outlet and inlet of each first wind energy transmitter, with a second switching valve installed on each venting circuit.

[0041] The transmission components consist of M units, where M is an integer greater than or equal to 1; the oil inlet of the second wind energy transmitter of each transmission component is connected to the lower oil pipe through a corresponding third switching valve, and the oil outlet of the second wind energy transmitter is connected to the upper oil pipe.

[0042] When the number of wind turbines is a set, the wind power generation system also includes a steering conversion mechanism; the steering conversion mechanism is set between the wind turbine shaft and the hydraulic pump input shaft, and is used to convert the continuous rotational motion of the wind turbine shaft into the rotational or reciprocating motion of the hydraulic pump input shaft.

[0043] When there are two sets of wind turbines, the wind power generation system also includes a speed synthesis mechanism or a coaxial transmission mechanism, as well as a steering conversion mechanism; the two input shafts of the speed synthesis mechanism are respectively connected to the two sets of wind turbine shafts, and its output shaft is connected to the input shaft of the steering conversion mechanism. The output shaft of the steering conversion mechanism is connected to the input shaft of the hydraulic pump, which is used to synthesize the continuous rotational motion of the two wind turbine shafts into the rotational or reciprocating motion of the hydraulic pump input shaft.

[0044] Furthermore, the steering conversion mechanism may include a crankshaft connecting rod drive assembly, or a coaxial drive assembly, or it may be one of the following two special mechanisms:

[0045] The first type of mechanism: the steering conversion mechanism includes a crankshaft connecting rod drive assembly, or a coaxial drive assembly, or a transmission assembly, a forward drive assembly, and a reverse drive assembly;

[0046] The transmission assembly includes a sliding platform with an elongated hole, an input shaft that passes through the elongated hole and can move relative to it in the forward and reverse directions, a forward output shaft that is positioned above the sliding platform and parallel to the input shaft, a reverse output shaft that is positioned below the sliding platform and parallel to the input shaft, a driving gear that is positioned on the input shaft, a first driven gear that is positioned on the forward input shaft and meshes with the driving gear, and a second driven gear that is positioned on the reverse input shaft and meshes with the driving gear.

[0047] The forward drive assembly includes at least one semi-annular forward gear disposed on the forward output shaft and a forward rack disposed on the upper surface of the sliding platform and meshing with the semi-annular forward gear; the reverse drive assembly includes at least one semi-annular reverse gear disposed on the reverse output shaft and a reverse rack disposed on the lower surface of the sliding platform and meshing with the semi-annular reverse gear; at any moment of rotation of the input shaft, only the forward gear meshes with the forward rack or the reverse gear meshes with the reverse rack;

[0048] One side of the sliding platform is connected to N / 2 of the hydraulic pump input shafts, and its opposite side is connected to the remaining N / 2 hydraulic pump input shafts.

[0049] The second type of mechanism: the steering conversion mechanism includes a crankshaft connecting rod drive assembly, or a coaxial drive assembly, or a transmission assembly, a forward drive assembly, and a reverse drive assembly;

[0050] The transmission assembly includes a sliding platform with an elongated hole, an input shaft that passes through the elongated hole and can move relative to it in the forward and reverse directions, and a semi-annular drive gear mounted on the input shaft.

[0051] The forward drive assembly includes a forward rack disposed on the upper surface of the elongated hole and meshing with the semi-annular drive gear, and the reverse drive assembly includes a reverse rack disposed on the lower surface of the elongated hole and meshing with the semi-annular drive gear; at any moment of rotation of the input shaft, the semi-annular drive gear meshes only with the forward rack or only with the reverse rack.

[0052] One side of the sliding platform is connected to N / 2 of the hydraulic pump input shafts, and its opposite side is connected to the remaining N / 2 hydraulic pump input shafts.

[0053] Meanwhile, the present invention also provides a control method for a wind power generation system with adjustable speed, which is characterized by including the following steps:

[0054] 1) Wind power drives the propellers on the wind turbine tower to rotate;

[0055] 2) The propeller drives at least one first wind energy transmitter to work, transmitting power to at least one second wind energy transmitter;

[0056] 3) Detect the output speed of the second wind energy transmitter, and control the output speed of the speed regulating unit according to the detected speed, so that the fluctuation value of the combined speed output by the second wind energy transmitter and the speed regulating unit through the speed regulator is less than the set value.

[0057] 4) The speed regulator drives the generator to generate electricity.

[0058] Further, in step 3), the speed regulating unit includes a third wind energy transmitter, a speed regulating generator, and a speed regulating motor connected in sequence. The power input of the third wind energy transmitter is connected to the power output of the first wind energy transmitter, and the power output of the speed regulating motor is connected to the power input of the speed regulator.

[0059] Alternatively, the speed-regulating unit includes a speed-regulating motor, which is connected to an external power grid via a driver;

[0060] Alternatively, the speed-regulating unit includes a third wind energy transmitter, a speed-regulating generator, and a speed-regulating motor connected in sequence. The power input of the third wind energy transmitter is connected to the power output of the first wind energy transmitter, and the power output of the speed-regulating motor is connected to the power input of the speed regulator. The speed-regulating motor is connected to the external power grid through a driver.

[0061] Furthermore, the first wind power transmitter is a hydraulic pump, which is placed on the wind turbine tower; the second and third wind power transmitters are hydraulic motors, which are placed under the wind turbine tower or on the ground.

[0062] Alternatively, the first, second, and third wind power transmitters may all be mechanical gearboxes, all mounted on the wind turbine tower.

[0063] Compared with the prior art, the advantages of the present invention are:

[0064] 1. The wind turbine of this invention drives the first wind power transmitter to work, which in turn drives the second wind power transmitter to work. The output fluctuation of the second wind power transmitter caused by unstable wind is compensated by the speed regulating motor, so that the speed fluctuation range of the input generator is less than the set value, and the speed tends to be constant, thereby improving the stability and efficiency of power generation. At the same time, it eliminates the need for the existing expensive frequency converter (converter), reducing costs. Moreover, since the speed increaser and frequency converter are eliminated, the load on the wind turbine tower is reduced, which can reduce the size and weight of the wind turbine tower, and also reduce the structural strength of the wind turbine tower.

[0065] 2. This invention employs multiple first wind energy transmitters connected in parallel. By controlling the corresponding switching valves, while ensuring that the output power of the second wind energy transmitter matches the output power of the wind turbine, it can ensure that each first and second wind energy transmitter is in optimal working condition, thereby improving the reliability of the first and second wind energy transmitters and guaranteeing power generation stability and maximum output power.

[0066] 3. Existing wind power systems house all transmission components within the nacelle high in the air, with the nacelle on the tower bearing a load of nearly 100 tons. This makes the hoisting and maintenance of these components extremely inconvenient, leading to increased system installation and operating costs. Furthermore, in the event of a system failure, the response time for subsequent procedures such as high-altitude operations and the dispatch of lifting equipment is long, severely impacting normal wind power efficiency and increasing maintenance costs. This invention eliminates the speed increaser on the existing wind turbine tower, allowing the transmission components to be placed on the ground beneath the tower. Wind energy drives a hydraulic pump via the propeller blades, then flexibly transmits it to the ground via high-pressure oil, where a hydraulic motor precisely drives the generator to produce electricity. This significantly reduces the weight and volume of the wind turbine tower, greatly lowering system price and maintenance costs. It also facilitates the transportation and hoisting of the wind turbine tower, saving installation costs. Ground-based wind power equipment can be repaired faster and more conveniently, shortening maintenance time and improving normal wind power efficiency.

[0067] 4. This invention uses the control of the hydraulic pump output port to achieve propeller braking, eliminating the need for the existing brake on the wind turbine tower. It has the advantages of simple structure, high reliability, and large braking force.

[0068] 5. This invention adopts a single-tower dual-propeller drive, which doubles the wind power output, improves the energy stability of the propeller blades, and reduces the cost of the wind power system and the unit of power generation.

[0069] 6. This invention places the hydraulic pump on the wind turbine tower, which has the advantages of high transmission efficiency, no radial force component, low wear, long service life, and low transmission noise.

[0070] 7. This invention uses a dual-propeller coaxial speed difference fault-tolerant drive method to achieve power coupling, which can improve wind power efficiency.

[0071] 8. This invention uses a generator at the base of the tower for power generation and regulation, which is easy to install, reduces operation and maintenance costs, and improves maintenance response speed.

[0072] 9. This invention dynamically optimizes the opening and closing combination of multiple hydraulic pumps on the tower according to the wind force to maximize the efficiency of wind energy; and adjusts the working start and stop combination of multiple hydraulic motors in real time to stabilize the generator speed near the synchronous speed, reduce the power consumption of filtering and stabilizing the power generation system, stabilize the power generation power and frequency, and facilitate grid connection. Attached Figure Description

[0073] Figure 1This is a schematic diagram of the principle and structure of an embodiment of the wind power generation system with adjustable speed according to the present invention. Figure 1 (The first type of speed-regulating unit structure);

[0074] Figure 2 This is a schematic diagram of the principle and structure of an embodiment of the wind power generation system with adjustable speed according to the present invention. Figure 2 (Second type of speed regulating unit structure);

[0075] Figure 3 This is a schematic diagram of the connection relationship between the wind turbine and the first wind power transmitter in an embodiment of the present invention;

[0076] Figure 4 This is a schematic diagram of multiple second wind power transmitters connected in parallel in an embodiment of the present invention;

[0077] Figure 5 This is a schematic diagram of the structure of the first steering conversion mechanism in an embodiment of the present invention;

[0078] Figure 6 This is a schematic diagram of the structure of the second steering conversion mechanism in an embodiment of the present invention;

[0079] Figure 7 This is a schematic diagram of the hydraulic oil circulation circuit in an embodiment of the present invention;

[0080] The reference numerals in the attached figures are as follows:

[0081] 1-First wind energy transmitter, 2-Hydraulic pump input shaft, 3-Planetary gear reducer, 4-Wind propeller shaft, 5-Wind propeller, 6-Blade, 7-Wind turbine tower, 8-Upper oil pipe, 9-Lower oil pipe, 10-Nacelle, 13-Second wind energy transmitter, 14-Generator, 15-Third switching valve, 16-First switching valve, 17-Second switching valve, 18-Sliding platform, 19-Elongated hole, 20-Input shaft, 21-Forward output shaft, 22-Reverse output shaft, 23-Driving gear, 24-First driven gear, 25-Second driven gear, 26-Forward gear, 27-Forward rack, 28-Reverse gear, 29-Reverse rack, 31-Speed-regulating motor, 32-Speed ​​regulator, 33-Driver, 34-Third wind energy transmitter, 35-Speed-regulating generator, 36-Gearbox. Detailed Implementation

[0082] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0083] like Figures 1 to 3 As shown, the present invention provides a wind power generation system with adjustable speed, including a wind turbine tower 7, a wind turbine propeller 5 mounted on the wind turbine tower 7, a nacelle 10 mounted above the wind turbine tower 7, an upper oil pipe 8 and a lower oil pipe 9 mounted inside the wind turbine tower 7 or on the outer wall of the wind turbine tower 7, a generator 14, and a speed regulating transmission mechanism.

[0084] The speed control transmission mechanism is used to transmit the power generated by the wind turbine 5 of the wind power generation system to the generator 14. It includes a controller, a first wind energy transmitter 1, a second wind energy transmitter 13, a speed control unit, a speed regulator 32, and a controller. The first wind energy transmitter 1 is located inside the nacelle 10 and is driven by the wind turbine shaft 4 of the wind turbine 5 through the planetary gear reducer 3, and at least one set of transmission components is installed inside the wind turbine tower 7 or on the ground outside the wind turbine tower 7.

[0085] Each transmission assembly includes a second wind energy transmitter 13, a speed regulating unit, and a speed stabilizer 32; the power input of the first wind energy transmitter 1 is used to connect to the wind turbine shaft 4; the power input of the second wind energy transmitter 13 is connected to the power output of the first wind energy transmitter 1.

[0086] This embodiment provides two structural forms of speed-regulating units:

[0087] The first type, such as Figure 1 As shown, the speed-regulating unit includes a third wind energy transmitter 34, a gearbox 36, a speed-regulating generator 35, and a speed-regulating motor 31 connected in sequence; the power input of the third wind energy transmitter 34 is connected to the power output of the first wind energy transmitter 1.

[0088] The second type, such as Figure 2 As shown, the speed regulating unit includes a speed regulating motor 31, which is connected to the external power grid via a driver 33;

[0089] In both of the above-mentioned speed-regulating units, the power output of the speed-regulating motor 31 and the power output of the second wind power transmitter 13 are connected to the speed regulator 32. In this embodiment, the speed regulator 32 is a planetary gear mechanism, with its sun gear connected to the power output of the second wind power transmitter 13 and its gear ring connected to the power output of the speed-regulating motor 31. In other embodiments, the speed-regulating unit can also adopt a combination of the above two structural forms. Specifically, the speed-regulating unit includes a third wind power transmitter 34, a gearbox 36, a speed-regulating generator 35, and a speed-regulating motor 31 connected in sequence. The speed-regulating motor 31 is connected to the external power grid through a driver 33.

[0090] The controller is used to collect the output speed of the second wind power transmitter 13 and adjust the output speed of the speed regulating unit in real time according to the collected output speed, so that the output speed fluctuation range of the speed regulator 32 is less than the set value, so that the output speed of the speed regulator 32 tends to a constant speed, thereby improving the stability and efficiency of power generation.

[0091] In this embodiment, the first wind power transmitter 1 is a hydraulic pump and / or a gas pump, or a mechanical transmission mechanism; the second wind power transmitter 13 can be a hydraulic motor or a mechanical transmission mechanism. When there are multiple sets of transmission components, the number of generators 14 is equal to the number of transmission components. The diagram shows multiple second wind power transmitters 13 connected in parallel and the second wind power transmitter 13 cooperating with the corresponding generator 14. (See attached diagram.) Figure 4 The third wind power transmitter 34 is a hydraulic motor and / or an air motor driven by an air energy storage structure, or a mechanical transmission mechanism. The first wind power transmitter 1 is a hydraulic pump placed on the tower; the second wind power transmitter 13 and the third wind power transmitter 34 are hydraulic motors placed under the wind turbine tower or on the ground; alternatively, the first wind power transmitter 1, the second wind power transmitter 13, and the third wind power transmitter 34 are all mechanical transmissions, all placed on the wind turbine tower.

[0092] In this embodiment, the first wind energy transmitter 1 is selected as a hydraulic pump, and the second wind energy transmitter 13 is selected as a hydraulic motor. The number of hydraulic pumps can be one or more, preferably an even number. The number of hydraulic pumps can be selected according to the maximum output power of the wind turbine 5. Figure 5 The number of hydraulic pumps, N, is 16, with 8 on each side. The hydraulic pumps can be selected from piston pumps, gear pumps, screw pumps, or vane pumps with speed increasers; and the hydraulic motors can be selected from piston hydraulic motors, gear hydraulic motors, or vane hydraulic motors.

[0093] like Figure 7 As shown, the outlet of each hydraulic pump is connected to the lower oil pipe 9 through a corresponding first switching valve 16, and the inlet of each hydraulic pump is connected to the upper oil pipe 8. A venting circuit is connected between the outlet and inlet of each hydraulic pump, and a second switching valve 17 is installed on the venting circuit. The number of hydraulic motors can be one or multiple in parallel, and the number M of hydraulic motors connected in parallel is selected according to the maximum output power of the hydraulic pump. The inlet of each hydraulic motor is connected to the lower oil pipe 9 through a corresponding third switching valve 15, and the outlet of each hydraulic motor is connected to the upper oil pipe 8. The hydraulic motors are used to drive the generator 14 to generate electricity.

[0094] Considering that the continuous rotational motion of the propeller 5 needs to be converted into reciprocating motion to drive the hydraulic pump, a steering conversion mechanism needs to be set between the propeller shaft 4 and the hydraulic pump input shaft 2.

[0095] When the number of propellers 5 is in a group, it is used to convert the continuous rotational motion of the propeller shaft 4 into the rotational or reciprocating motion of the hydraulic pump input shaft 2.

[0096] When there are two sets of propellers 5, a speed synthesis mechanism or coaxial synthesis mechanism should be set before the steering conversion mechanism. The two input shafts of the speed synthesis mechanism are connected to the two sets of propeller shafts 4 respectively, and its output shaft is connected to the input shaft 20 of the steering conversion mechanism. It can be set in a conventional way, as long as it can combine the speeds of the two propeller shafts 4 into one speed and output it. The two input shafts of the speed synthesis mechanism are connected to the two sets of propeller shafts 4 respectively, and its output shaft is connected to the input shaft 20 of the steering conversion mechanism. The output shaft of the steering conversion mechanism is connected to the hydraulic pump input shaft 2, which is used to combine the continuous rotational motion of the two propeller shafts 4 into the rotational or reciprocating motion of the hydraulic pump input shaft 2.

[0097] The steering mechanism can have a variety of different structures; this embodiment provides two preferred structures.

[0098] The first type of steering mechanism is described below. Figure 5 It includes a transmission assembly, a forward drive assembly, and a reverse drive assembly; the transmission assembly includes a sliding platform 18 with an elongated hole 19, an input shaft 20 passing through the elongated hole 19 and capable of moving relative to it in both directions, a forward output shaft 21 positioned above the sliding platform 18 and parallel to the input shaft 20, a reverse output shaft 22 positioned below the sliding platform 18 and parallel to the input shaft 20, a driving gear 23 mounted on the input shaft 20, a first driven gear 24 mounted on the forward input shaft 21 and meshing with the driving gear 23, and a second driven gear 25 mounted on the reverse input shaft 22 and meshing with the driving gear 23; the forward drive assembly... It includes eight semi-annular forward gears 26 mounted on the forward output shaft 21, forward racks 27 mounted on the upper surface of the sliding platform 18 and meshing with the semi-annular forward gears 26, eight semi-annular reverse gears 28 mounted on the reverse output shaft 22, and reverse racks 29 mounted on the lower surface of the sliding platform 18 and meshing with the semi-annular reverse gears 28. At any moment when the input shaft 20 rotates, only the forward gears 26 and the forward racks 27 are meshed, or the reverse gears 28 and the reverse racks 29 are meshed. One side of the sliding platform 18 is connected to eight of the hydraulic pump input shafts 2, and its opposite side is connected to the remaining eight hydraulic pump input shafts 2.

[0099] See Figure 6The second type of steering mechanism operates on the same principle as the first type, also including a transmission assembly, a forward drive assembly, and a reverse drive assembly. The transmission assembly includes a sliding platform 18 with an elongated hole 19, an input shaft 20 passing through the elongated hole 19 and capable of moving relative to it in both directions, and a semi-annular drive gear 23 mounted on the input shaft 20. The forward drive assembly includes a forward rack 27 mounted on the upper surface of the elongated hole 19 and meshing with the semi-annular drive gear 23, and a reverse rack 29 mounted on the lower surface of the elongated hole 19 and meshing with the semi-annular drive gear 23. At any given moment during the rotation of the input shaft 20, the semi-annular drive gear 23 meshes only with the forward rack 27 or only with the reverse rack 29. Figure 5 Similarly, one side of the sliding platform 18 is connected to eight of the hydraulic pump input shafts 2, and its opposite side is connected to the remaining eight hydraulic pump input shafts 2.

[0100] The present invention also provides a control method for the above-mentioned wind power generation system with adjustable speed, comprising the following steps:

[0101] 1) The wind turbine 7 is driven by wind power to rotate the propeller 5;

[0102] 2) Select the first wind energy transmitter 1 to work according to the maximum output power of the wind turbine 5, and transmit the power to at least one second wind energy transmitter 13.

[0103] 3) The controller detects the output speed of the second wind power transmitter 13 in real time, and controls the output speed of the speed regulating motor 31 of the speed regulating unit according to the detected speed, so that the combined speed output by the second wind power transmitter 13 and the speed regulating motor 31 through the speed regulator 32 has a fluctuation value less than the set value.

[0104] 4) The speed regulator 32 drives the generator 14 to generate electricity.

[0105] When the propeller 5 needs to be braked, simply close all the first switch valves 16 and the second switch valves 17.

[0106] To balance the operating status of each hydraulic pump and motor, and to prevent some hydraulic pumps or motors from working for extended periods while others remain idle, thus prolonging the maintenance cycle of the entire system, the on / off state of the corresponding hydraulic pump or motor can be selected by calculating the cumulative operating time of each hydraulic pump and motor.

[0107] When temporary wind energy storage is needed, the second wind energy transmitter can be turned off, allowing all the output kinetic energy of the wind turbine to be sent into the air energy storage structure; when the stored wind energy needs to be output, the air energy storage structure drives the air motor or turbine unit, which in turn drives the speed-regulating generator.

[0108] The above description is merely of preferred embodiments of the present invention and does not limit the technical solution of the present invention to these embodiments. Any modifications made by those skilled in the art based on the main technical concept of the present invention shall fall within the scope of the technology to be protected by the present invention.

Claims

1. A wind power generation system with adjustable speed, comprising a wind turbine tower (7), a propeller (5), a generator (14), a nacelle (10), and a controller, characterized in that: It also includes a first wind power transmitter (1) installed in the nacelle (10) and at least one set of transmission components installed below the wind turbine tower (7) or on the ground outside the wind turbine tower (7); Each transmission assembly includes a second wind energy transmitter (13), a speed regulating unit, and a speed regulator (32). The power input of the first wind power transmitter (1) is connected to the rotor shaft (4) of the outer rotor (5) of the wind turbine tower (7); the first wind power transmitter (1) is a hydraulic pump; The power input of the second wind energy transmitter (13) is connected to the power output of the first wind energy transmitter (1); The power input of the speed regulating unit is connected to the power output of the first wind power transmitter (1), or the power input of the speed regulating unit is provided by the external power grid; The power input of the speed regulator (32) is connected to the power output of the second wind power transmitter (13) and the power output of the speed regulating unit, respectively, and its power output is connected to the power input of the generator (14). The controller is used to collect the output speed of the second wind power transmitter (13) and adjust the output speed of the speed regulating unit in real time according to the collected output speed, so that the output speed fluctuation range of the speed regulator (32) is less than the set value. The number of the wind turbines (5) is one set, and the wind power generation system also includes a steering conversion mechanism; the steering conversion mechanism is set between the wind turbine shaft (4) and the hydraulic pump input shaft (2) and is used to convert the continuous rotational motion of the wind turbine shaft (4) into the rotation or reciprocating motion of the hydraulic pump input shaft (2); Alternatively, the number of the wind turbines (5) is two sets, and the wind power generation system also includes a speed synthesis mechanism or a coaxial transmission mechanism, as well as a steering conversion mechanism; the two input shafts of the speed synthesis mechanism are respectively connected to two sets of wind turbine shafts (4), and its output shaft is connected to the input shaft (20) of the steering conversion mechanism. The output shaft of the steering conversion mechanism is connected to the hydraulic pump input shaft (2) to synthesize the continuous rotational motion of the two wind turbine shafts (4) into the rotation or reciprocating motion of the hydraulic pump input shaft (2); The steering conversion mechanism includes a transmission assembly, a forward drive assembly, and a reverse drive assembly; The transmission assembly includes a sliding platform (18) with an elongated hole (19), an input shaft (20) that passes through the elongated hole (19) and can move relative to it in the forward and reverse directions, a forward output shaft (21) that is above the sliding platform (18) and parallel to the input shaft (20), a reverse output shaft (22) that is below the sliding platform (18) and parallel to the input shaft (20), a drive gear (23) that is on the input shaft (20), a first driven gear (24) that is on the forward input shaft and meshes with the drive gear (23), and a second driven gear (25) that is on the reverse input shaft and meshes with the drive gear (23). The forward drive assembly includes at least one semi-annular forward gear (26) disposed on the forward output shaft (21) and a forward rack (27) disposed on the upper surface of the sliding platform (18) and meshing with the semi-annular forward gear (26); the reverse drive assembly includes at least one semi-annular reverse gear (28) disposed on the reverse output shaft (22) and a reverse rack (29) disposed on the lower surface of the sliding platform (18) and meshing with the semi-annular reverse gear (28); at any moment when the input shaft (20) rotates, only the forward gear (26) meshes with the forward rack (27) or the reverse gear (28) meshes with the reverse rack (29); One side of the sliding platform (18) is connected to N / 2 of the hydraulic pump input shafts (2), and its opposite side is connected to the remaining N / 2 hydraulic pump input shafts (2).

2. The wind power generation system with adjustable speed according to claim 1, characterized in that: The speed-regulating unit includes a third wind energy transmitter (34), a speed-regulating generator (35), and a speed-regulating motor (31) connected in sequence. The power input of the third wind energy transmitter (34) is connected to the power output of the first wind energy transmitter (1), and the power output of the speed-regulating motor (31) is connected to the power input of the speed regulator (32). Alternatively, the speed regulating unit includes a speed regulating motor (31), which is connected to an external power grid via a driver (33); Alternatively, the speed-regulating unit includes a third wind power transmitter (34), a speed-regulating generator (35), and a speed-regulating motor (31) connected in sequence. The power input of the third wind power transmitter (34) is connected to the power output of the first wind power transmitter (1), and the power output of the speed-regulating motor (31) is connected to the power input of the speed regulator (32). The speed-regulating motor (31) is connected to the external power grid through a driver (33). The second wind power transmitter (13) is a hydraulic motor or a mechanical transmission mechanism; The third wind energy transmitter (34) is a hydraulic motor or an air motor driven by an air energy storage structure, or the third wind energy transmitter (34) is a mechanical transmission mechanism.

3. The wind power generation system with adjustable speed according to claim 2, characterized in that: The hydraulic pump is a piston pump, gear pump, screw pump, or vane pump with a speed increaser. The hydraulic motor is a piston-type hydraulic motor, a gear-type hydraulic motor, or a vane-type hydraulic motor. The speed regulator (32) is a planetary gear mechanism, whose sun gear is connected to the power output of the second wind power transmitter (13), and whose gear ring is connected to the power output of the speed regulating unit.

4. The wind power generation system with adjustable speed according to any one of claims 1 to 3, characterized in that: An upper oil pipe (8) and a lower oil pipe (9) are installed inside or outside the wind turbine tower (7). The number of the first wind energy transmitters (1) is N, where N is a positive integer; the outlet of each first wind energy transmitter (1) is connected to the lower oil pipe (9) through a corresponding first switch valve (16), the inlet of each first wind energy transmitter (1) is connected to the upper oil pipe (8), and a venting circuit is connected between the outlet and inlet of each first wind energy transmitter (1), and a second switch valve (17) is provided on each venting circuit. The transmission components are M in number, where M is an integer greater than or equal to 1; the oil inlet of the second wind energy transmitter (13) of each transmission component is connected to the lower oil pipe (9) through the corresponding third switch valve (15), and the oil outlet of the second wind energy transmitter (13) is connected to the upper oil pipe (8).

5. A control method for a wind power generation system with adjustable speed, based on the wind power generation system with adjustable speed according to any one of claims 1-4, characterized in that, Includes the following steps: 1) The wind turbine (5) on the wind turbine tower (7) is driven to rotate by wind power; 2) The propeller (5) drives at least one first wind energy transmitter (1) to work and transmit power to at least one second wind energy transmitter (13). 3) Detect the output speed of the second wind energy transmitter (13), and control the output speed of the speed regulating unit according to the detected speed, so that the combined speed output by the second wind energy transmitter (13) and the speed regulating unit through the speed regulator (32) has a fluctuation value less than the set value. 4) The speed regulator (32) drives the generator (14) to generate electricity.

6. The control method for the wind power generation system with adjustable speed according to claim 5, characterized in that, In step 3): The speed-regulating unit includes a third wind energy transmitter (34), a speed-regulating generator (35), and a speed-regulating motor (31) connected in sequence. The power input of the third wind energy transmitter (34) is connected to the power output of the first wind energy transmitter (1), and the power output of the speed-regulating motor (31) is connected to the power input of the speed regulator (32). Alternatively, the speed regulating unit includes a speed regulating motor (31), which is connected to an external power grid via a driver (33); Alternatively, the speed regulating unit includes a third wind energy transmitter (34), a speed regulating generator (35), and a speed regulating motor (31) connected in sequence. The power input of the third wind energy transmitter (34) is connected to the power output of the first wind energy transmitter (1), and the power output of the speed regulating motor (31) is connected to the power input of the speed regulator (32). The speed-regulating motor (31) is connected to the external power grid via a driver (33).

7. The control method for a wind power generation system with adjustable speed according to claim 5 or 6, characterized in that: The first wind power transmitter (1) is a hydraulic pump and is placed on the wind power tower (7); the second wind power transmitter (13) and the third wind power transmitter (34) are hydraulic motors and are placed under the wind power tower (7) or on the ground. Alternatively, the first wind power transmitter (1), the second wind power transmitter (13) and the third wind power transmitter (34) are all mechanical gearboxes, and are all placed on the wind power tower (7).

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