A force measurement test device for a wind turbine model with controllable rotation speed in a wind tunnel test.

Abstract

A force measurement test device for a wind turbine model with controllable rotational speed in a wind tunnel test is disclosed, relating to wind tunnel measurement and verification of wind turbines. It includes a braking mechanism, a speed sensing mechanism, a controller, and a data acquisition system. By setting up the braking mechanism, when the speed sensing mechanism detects that the rotor speed of the wind turbine exceeds the set rated speed, it transmits a signal to the controller. The controller then connects the power supply to the electric actuator. The PLC control unit sets the thrust of the electric actuator in real time according to the wind speed, braking the wind turbine blades through a friction pad. This braking action on the turbine blades ensures that the wind turbine can rotate at the rated wind speed under different given wind speeds in the wind tunnel test, simulating stable power generation of the wind turbine in actual conditions. The six component forces acting on the wind turbine are measured using a six-component balance, and the data is then acquired by the data acquisition system to obtain wind tunnel experimental data.

Description

Technical Field

[0001] This invention relates to the field of wind tunnel wind turbine measurement and testing technology, specifically to a force measurement test device for a wind turbine model with controllable rotation speed in a wind tunnel test. Background Technology

[0002] Wind power generation refers to converting the kinetic energy of wind into electrical energy. Wind energy is a clean and pollution-free renewable energy source that has been utilized by humans for a long time, mainly through windmills for pumping water and grinding grain. Wind power generation is very environmentally friendly, and wind energy reserves are enormous, thus attracting increasing attention from countries around the world. However, wind turbines cannot operate under all wind conditions. Wind turbines have a rated speed limit; if the wind speed is too high, the generator's power generation efficiency will be relatively low.

[0003] The existing wind tunnel size is insufficient to accommodate the entire generator for wind tunnel testing, requiring scaled-down testing. However, the existing wind tunnel test models are difficult to simulate the operation of a wind turbine at its rated speed. Summary of the Invention

[0004] The purpose of this invention is to address the problems mentioned in the background art, such as the inability of existing wind tunnel models to fully meet the experimental requirements, by providing a wind turbine generator measuring device with controllable rotation speed in wind tunnel tests. This device can stop rotating when the blade rotation speed is too low, rotate at the rated wind speed X1 within the wind speed range of X1 to X2, and rotate at another wind speed X3 when the wind speed is higher, according to the experimental requirements.

[0005] A wind turbine generator measuring device with controllable rotational speed for wind tunnel testing, comprising:

[0006] A speed sensing mechanism is used to monitor the fan speed; the speed sensing mechanism adopts a speed sensor, and the speed sensor is electrically connected to the controller.

[0007] The controller is used to start the electric actuator power supply based on the fan speed obtained by the speed sensing mechanism; the controller includes a servo motor and a PLC control unit; the PLC control unit is used to set the electric actuator thrust in real time according to the wind speed;

[0008] A braking mechanism for braking the fan; the braking mechanism includes a friction pad and an electric push rod;

[0009] The data acquisition system is used to collect the rotational speed parameters of the speed sensor and the mechanical parameters of the six-component balance in each direction, and output them to the PC. The data acquisition system includes a data acquisition module, a six-component balance, and a PC. The PC is used to control the PLC control unit to drive the servo motor in the controller to provide the power required for test verification, and to input the required thrust of the electric push rod, thereby achieving the purpose of braking the fan speed, i.e., controlling the speed, through the friction pad.

[0010] Preferably, the wind turbine generator measuring device with controllable rotation speed in the wind tunnel test further includes a lower mounting plate and an upper mounting plate. The lower part of the six-component balance is fixed to the lower mounting plate by fastening bolts, and the upper part of the six-component balance is fixed to the upper mounting plate by fastening bolts. A servo motor is fixed on the upper mounting plate.

[0011] Preferably, the wind turbine generator measuring device with controllable rotation speed in the wind tunnel test also includes a support column, which is a generator tower that simulates the wind turbine generator. The support column is fixed in the wind tunnel test chamber and is fixedly connected to the mounting plate under the balance by fastening bolts.

[0012] Preferably, the servo motor has a mounting plate on its side that supports the electric push rod.

[0013] Preferably, the speed sensor is supported on the hub, directly measuring the speed of the fan blades and inputting the data into a PC via an electrical connection.

[0014] Preferably, the friction pad is in close contact with the wheel hub, and the electric push rod is fixedly connected to the friction pad.

[0015] This invention employs a braking mechanism. When the speed sensing mechanism detects that the rotor speed of the wind turbine exceeds the set rated speed, it transmits a signal to the controller. The controller then activates the power supply to the electric actuator. The PLC control unit then sets the thrust of the electric actuator in real time based on the wind speed, which brakes the wind turbine blades via a friction pad. This braking action on the generator blades ensures that the wind turbine rotates at its rated wind speed under different wind speeds during wind tunnel testing, simulating stable power generation in real-world conditions. Furthermore, the six component forces acting on the wind turbine are measured using a six-component balance, and the data is acquired through a data acquisition system to obtain wind tunnel experimental data.

[0016] The present invention has the following outstanding technical and beneficial effects:

[0017] 1. This invention incorporates a braking mechanism. When the speed sensing mechanism detects that the wind turbine blades are rotating outside the rated wind speed during a wind tunnel test, it transmits a signal to the controller. The controller then activates the servo motor power supply and sets the thrust of the electric push rod according to the program input to the PLC control unit. The electric push rod applies pressure to the friction pad to brake the wind turbine blades. This satisfies the requirement that the blades do not rotate at lower wind speeds, rotate at the rated wind speed X1 within the wind speed range of X1 to X2, and rotate at a different wind speed X3 at higher wind speeds. By incorporating this braking mechanism, the wind turbine is effectively braked, simulating the blade rotation during stable power generation.

[0018] 2. The wind turbine generator measuring device with controllable rotation speed provided by the present invention has a simple structure, can collect data in real time, has low manufacturing cost, can simulate the stable power generation of wind turbine generators, and ensures the effectiveness of the test process. It is a comprehensive system.

[0019] 3. The electric push rod actuator used in the wind tunnel test controllable speed wind turbine measuring device provided by the present invention requires power supply when changing the control opening degree, and no longer requires power supply when the required opening degree is reached. Therefore, from the perspective of energy saving, the electric push rod actuator has obvious energy saving advantages over the pneumatic actuator. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the main body of the wind turbine generator with controllable rotation speed proposed in this invention.

[0021] Figure 2 This is a schematic diagram of the wind turbine generator with controllable rotation speed proposed in this invention.

[0022] Figure 3 This is a flowchart of the control method for the wind turbine generator with controllable rotation speed proposed in this invention.

[0023] The markings in the diagram are as follows: 1. Paddle cap; 2. Fan blade; 3. Speed ​​sensor; 4. Electric actuator; 5. Fan housing; 6. Six-component balance; 7. Support column; 8. Hub; 9. Friction pad; 10. Data acquisition module; 11. PLC control unit; 12. PC; 13. Servo motor. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0025] In the description of this invention, it should be understood that the terms "upper", "lower", "bottom", "inner", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0026] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] See Figures 1-3 The present invention provides a technical solution:

[0028] A wind turbine generator measuring device with controllable rotation speed in wind tunnel testing includes a speed sensor 3, a servo motor 13, a PLC control unit 11, a friction pad 9, an electric push rod 4, a data acquisition module 10, a six-component balance 6, a support column 7, and a PC 12.

[0029] The speed sensor 3 is a speed sensing mechanism. The speed sensor 3 is electrically connected to the controller. The speed sensor 3 is close to the hub 8. The speed sensor 3 is used to measure the speed of the hub 8, which is the speed of the wind turbine blade 2 of the wind turbine generator. The measured data is then input into the PC 12 for analysis through electrical connection. The wind turbine blade 2 is provided with a blade cap 1.

[0030] The controller includes a servo motor 13 and a PLC control unit 11, which are electrically connected. The PLC control unit is also electrically connected to a PC 12. When the speed input from the speed sensor 3 to the PC is not at the rated wind speed, the PLC control unit 11 determines the thrust input to the electric actuator.

[0031] Friction pad 9 is located on the outside of electric push rod 4. Friction pad 9 and electric push rod 4 are fixedly connected to form a braking mechanism. Friction pad 9 is in close contact with wheel hub 8. When the controller starts electric push rod 4, the thrust input through PLC control unit 11 is based on the magnitude of friction required to control the speed, so as to achieve the effect of fan speed control.

[0032] The six-component balance 6 is used to measure the mechanical parameters of a wind turbine generator in six directions. To facilitate the installation of the six-component balance 6, the invention may also include a lower mounting plate and an upper mounting plate. The lower part of the six-component balance 6 is fixed to the lower mounting plate with fastening bolts, and the upper part of the six-component balance 6 is fixed to the upper mounting plate with fastening bolts. A servo motor 13 is fixed on the upper mounting plate.

[0033] The supporting column 7 is a simulated power generation tower below a wind turbine. The supporting column 7 is fixed inside the wind tunnel test chamber and is fixedly connected to the mounting plate under the balance by fastening bolts.

[0034] When the wind speed stabilizes after passing the braking mechanism, the six-component balance 6 begins to measure the force components in six directions acting on the wind turbine, which are then transmitted to the PC 12 via the data acquisition module 10. The data acquisition module 10 is used to collect the rotational speed parameters of the speed sensor 3 and the mechanical parameters in each direction of the six-component balance 6. The PC 12 is used to control the servo motor 13 in the PLC control unit 11 to provide the power required for the test and verification, and to input the required thrust of the electric push rod 4. The data acquisition module 10 and the PC 12 together form a data acquisition system.

[0035] In this embodiment, the wind turbine measurement test with controllable rotation speed in the wind tunnel provides the following: At the start, the wind turbine blades rotate due to the wind speed supplied by the wind tunnel. The blade rotation speed is first acquired by a speed sensor, which transmits the real-time speed to the controller. The data acquisition system analyzes the data to determine whether the control system should participate. When the speed sensor detects that the wind speed in the wind tunnel test is greater than the rated rotation speed, it sends a signal to the controller. The controller then activates the servo motor. Based on the program input to the PLC control unit, the thrust of the electric push rod is set. The PLC control unit controls the thrust of the electric push rod, which applies pressure to the friction pad to brake the wind turbine blades, achieving stable rotation at a stable wind speed. The mechanical parameters in each direction obtained by the six-component balance are acquired by the data acquisition module and output to the PC for storage, completing the measurement. This meets the requirements of the wind turbine blades not rotating at lower wind speeds, rotating at the rated wind speed X1 within the wind speed range X1 to X2, and rotating at another wind speed X3 at higher wind speeds. By setting a braking mechanism, the wind turbine is braked, effectively simulating the wind turbine blade rotation during stable power generation.

[0036] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A force measurement test device for a wind turbine generator model with controllable rotational speed in a wind tunnel test, characterized in that... include: A speed sensing mechanism is used to monitor the fan speed; the speed sensing mechanism adopts a speed sensor, and the speed sensor is electrically connected to the controller. The controller is used to start the electric actuator power supply based on the fan speed obtained by the speed sensing mechanism; the controller includes a servo motor and a PLC control unit; the PLC control unit is used to set the electric actuator thrust in real time according to the wind speed; A braking mechanism is used to brake the fan; the braking mechanism includes a friction pad and an electric push rod; the friction pad is in close contact with the hub, and the electric push rod is fixedly connected to the friction pad; The data acquisition system is used to collect the rotational speed parameters of the speed sensor and the mechanical parameters of the six-component balance in each direction, and output them to the PC. The data acquisition system includes a data acquisition module, a six-component balance and a PC. The PC is used to control the PLC control unit to drive the servo motor in the controller to provide the power required for test verification, and to input the required thrust of the electric push rod, so as to achieve the purpose of braking the fan speed and controlling the speed through the friction pad. It also includes a lower mounting plate and an upper mounting plate. The lower part of the six-component balance is fixed to the lower mounting plate by fastening bolts, and the upper part of the six-component balance is fixed to the upper mounting plate by fastening bolts. A servo motor is fixed on the upper mounting plate. It also includes a support column, which is a power generation tower that simulates the bottom of a wind turbine. The support column is fixed in the wind tunnel test chamber and is fixedly connected to the mounting plate under the balance by fastening bolts. By setting a braking mechanism, when the speed sensing mechanism detects that the speed of the wind turbine rotor is greater than the set rated speed, it transmits a signal to the controller. The controller then turns on the power to the electric push rod. The PLC control unit sets the thrust of the electric push rod in real time according to the wind speed. The friction pad brakes the wind turbine blades, and the braking action on the generator blades ensures that the wind turbine can rotate at the rated wind speed when given different wind speeds in the wind tunnel test. This simulates the stable power generation of the wind turbine in actual conditions. The six component forces on the wind turbine are measured by a six-component balance, and the data is then collected by the data acquisition system to obtain the wind tunnel test data.

2. The force measurement test device for a wind turbine model with controllable rotational speed in a wind tunnel test as described in claim 1, characterized in that... The servo motor has a mounting plate on its side that supports the electric push rod.

3. The force measurement test device for a wind turbine model with controllable rotational speed in a wind tunnel test as described in claim 1, characterized in that... The speed sensor is supported on the hub and directly measures the speed of the fan blades, then inputs the data into a PC via an electrical connection.

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