CN103399169B - A kind of wind speed measuring device for wind energy conversion system - Google Patents

Abstract

The invention relates to a wind speed measuring device, in particular to a wind speed measuring device for a wind turbine. The invention provides a wind speed measurement device for a wind turbine, which includes a blade, and the wind speed measurement mechanism is arranged on the blade, and the wind speed measurement mechanism includes an insertion piece, a lever mechanism and a force sensor, and the insertion piece passes through The lever mechanism is connected with the paddle, and the force sensor is connected with the lever mechanism. The beneficial effects of the present invention are: the inserting piece can be aligned with the direction of the incoming wind, and the resistance generated by the wind resistance can be received. Since the magnitude of the moment received by the inserting piece is small, it is difficult to select a suitable torque measuring device, and the inserting piece can be moved through the lever mechanism. The resistance moment generated by the wind resistance of the sheet is converted into a force, and then the force sensor is used to measure the magnitude of the force, so as to facilitate the calculation of the torque on the insert and realize the measurement of wind speed with low cost.

Description

A wind speed measuring device for a wind turbine

technical field

The invention relates to a wind speed measuring device, in particular to a wind speed measuring device for a wind turbine.

Background technique

It is difficult to accurately measure the magnitude and direction of wind speed, but for wind turbine systems, accurate wind speed information is of great reference value for variable speed control, pitch control, and vibration reduction control of wind turbine systems. The wind has the characteristics of randomness and volatility, and the wind speed of the same measurement point on the wind turbine rotor surface at different time points is inconsistent. The diameter of modern wind turbines is large, and the effects of wind speed shear and tower shadow effect are obvious. At the same time, the wind speed of each point on the rotating surface of the wind rotor is not uniform.

For systems with rotor structure characteristics such as wind turbines, the composite wind speed received by a certain point on the rotor is synthesized by the incoming wind speed of the air and the linear speed of the rotor. The wind speed of the synthetic wind changes, and the wind direction of the synthetic wind also changes.

The current wind speed measurement technology mainly includes the following types:

1. Measuring device based on the principle of air static pressure and dynamic pressure: Pitot tube is a kind of wind speed measuring device widely used on fixed-wing aircraft (such as aircraft) at present. It uses the static pressure and dynamic pressure generated by wind flow to Pressure to measure wind speed. When the pitot tube is measuring speed, the head should be aligned with the incoming wind. The direction of the incoming wind at a certain point on the blade of a wind turbine is uncertain, which limits the application of pitot tubes.

2. Measuring device based on wind cooling effect: the hot-wire anemometer uses the resistance change or thermal compensation effect generated when the sensor is cooled by wind in the energized state to convert the wind speed signal into an electrical signal, with a constant current working mode and Constant temperature working mode. Hot wire anemometers are expensive to install and maintain.

3. A measuring device based on laser or ultrasound propagating in the flowing air to generate the Doppler effect: Laser Doppler anemometers (Laser Doppler anemometers) divide the laser into two beams, one of which propagates outside the anemometer, using the Doppler effect of the laser The wind speed information can be deduced from the Le effect. It is also more expensive to use. In addition, there are ultrasonic anemometers (ultrasonic anemometer) and improved acoustic resonance anemometers (Acousticresonance anemometer) based on the sound Doppler effect principle.

When the existing wind speed measurement device is used for wind turbines, there are mainly two problems:

1. Since the direction of the synthetic wind speed received by the blades of the wind turbine changes, the pitot tube needs to be aligned with the direction of the incoming wind to accurately test the wind speed. How to install this type of wind speed measuring device that needs to be aligned with the direction of the incoming wind on the wind turbine On the paddles is a tricky puzzle.

2. The price and maintenance cost of hot wire anemometer, laser Doppler anemometer, ultrasonic anemometer and acoustic resonance anemometer are relatively high.

Contents of the invention

In order to solve the problems in the prior art, the invention provides a wind speed measuring device for a wind turbine.

The invention provides a wind speed measurement device for a wind turbine, which includes a blade, and the wind speed measurement mechanism is arranged on the blade, and the wind speed measurement mechanism includes an insertion piece, a lever mechanism and a force sensor, and the insertion piece passes through The lever mechanism is connected with the paddle, and the force sensor is connected with the lever mechanism.

As a further improvement of the present invention, the lever mechanism is connected with a heating and deicing device.

As a further improvement of the present invention, the height of the insert is 2% of the chord length of the blade, the width of the insert is 0.5% of the chord length of the blade, and the thickness of the insert is 0.2% of the chord length of the blade.

As a further improvement of the present invention, the installation position of the insert is at 10% of the chord length of the blade.

As a further improvement of the present invention, there are at least two wind speed measuring mechanisms.

As a further improvement of the present invention, there are two wind speed measuring mechanisms, the inserts are an upper insert and a lower insert respectively, the upper insert is arranged on the upper surface of the blade, and the lower insert It is arranged on the lower surface of the paddle.

The beneficial effects of the present invention are: through the above scheme, the inserting piece can be aligned with the direction of the incoming wind to receive the resistance generated by the windage resistance. Since the magnitude of the torque received by the inserting piece is small, it is difficult to select a suitable torque measuring device. The lever mechanism converts the resistance torque generated by the insert against wind resistance into force, and then uses the force sensor to measure the magnitude of the force, so as to easily calculate the torque on the insert and realize wind speed measurement with low cost.

Description of drawings

Fig. 1 is a schematic structural view of an wind speed measuring device for a wind turbine according to the present invention.

detailed description

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

The reference numerals in FIG. 1 are: an insert 1; a lever mechanism 2; a force sensor 3; a heating and deicing device 4;

As shown in Figure 1, a wind speed measuring device for a wind turbine includes a blade 5, and the blade 5 is provided with a wind speed measuring mechanism, and the wind speed measuring mechanism includes an insert 1, a lever mechanism 2 and a force sensor 3. The insertion piece 1 is connected to the paddle 5 through the lever mechanism 2 , and the force sensor 3 is connected to the lever mechanism 2 .

As shown in Figure 1, the lever mechanism 2 is connected with a heating and deicing device 4. Since both the insert 1 and the lever mechanism 2 are made of metal, the heating and deicing device 4 is installed at the fulcrum of the lever mechanism 2 to prevent the insert 1 Freeze in cold conditions so as not to affect the measurement results.

As shown in Figure 1, the height of the insert 1 is 2% of the chord length of the blade 5, and the width of the insert 1 is 0.5% of the chord length of the blade 5. The thickness of 1 is 0.2% of the chord length of the blade 5.

As shown in FIG. 1 , the installation position of the insert 1 is at 10% of the chord length of the blade 5 .

As shown in Fig. 1, there are at least two wind speed measuring mechanisms.

As shown in Figure 1, there are two wind speed measuring mechanisms, the inserts 1 are respectively an upper insert and a lower insert, the upper insert is arranged on the upper surface of the blade 5, and the lower insert The sheet is arranged on the lower surface of the paddle 5 .

The present invention measures the principle of wind speed as:

Step 1: Use the experimental method to measure the 3D grid diagram of the moment on the insert 1 on the upper and lower surfaces under different synthetic wind speeds and angles of attack of the blade 5, and then use the surface interpolation method to obtain the 3D surface picture.

Step 2: Measure the force or moment of the insert 1 on the upper surface, measure the force or moment on the insert 1 on the lower surface, and obtain the force corresponding to the force on the insert 1 on the upper and lower surfaces through the query method (wind speed - angle of attack) curve.

Step 3: Determine the composite wind speed received by the blade 5 through the intersection of the wind speed-angle of attack curves on the upper and lower surfaces, and use the speed measuring device to obtain the rotational angular velocity of the blade ( ), according to the installation position of insert 1 ( ), the local linear velocity of the rotor can be obtained ( ). The local wind speed information of the incoming wind received by the wind turbine is obtained by using the formula.

The fourth step: According to the local wind speed information obtained by the small insert, the shear wind speed information of the wind turbine rotor surface is obtained.

A wind speed measuring device for a wind turbine provided by the present invention has the following advantages and beneficial effects:

1. The present invention has simple structure, strong robustness, and relatively low installation and maintenance costs.

2. The present invention can be combined with other large-scale wind speed measurement technologies as a verification and measurement means for local wind speed information.

3. Under a certain algorithm, the present invention can be used to predict turbulent flow, etc., and then realize effective vibration reduction control for wind turbines.

The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be assumed that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention, some simple deduction or replacement can be made, which should be regarded as belonging to the protection scope of the present invention.

Claims (6)

1. A wind speed measuring device for a wind turbine, characterized in that: it comprises a blade, the blade is provided with a wind speed measuring mechanism, and the wind speed measuring mechanism includes an insert, a lever mechanism and a force sensor, and the insert The sheet is connected to the paddle through the lever mechanism, and the force sensor is connected to the lever mechanism. 2. The wind speed measurement device for wind turbine according to claim 1, characterized in that: said lever mechanism is connected with a heating and deicing device. 3. The wind speed measurement device for wind turbine according to claim 1, characterized in that: the height of the insert is 2% of the chord length of the blade, and the width of the insert is 2% of the chord length of the paddle. 0.5% of the chord length of the blade, and the thickness of the insert is 0.2% of the chord length of the blade. 4. The wind speed measuring device for a wind turbine according to claim 1, characterized in that: the distance between the installation position of the insert and the end edge of the blade is equal to the chord length of the blade 10%. 5. The wind speed measurement device for wind turbine according to claim 1, characterized in that there are at least two wind speed measurement mechanisms. 6. The wind speed measuring device for a wind turbine according to claim 1, characterized in that: there are two wind speed measuring mechanisms, the inserts are respectively an upper insert and a lower insert, and the upper insert It is arranged on the upper surface of the blade, and the lower insert is arranged on the lower surface of the blade.