You can consider this method:
Connect the generator to a purely resistive fixed load with sufficient power and install a wind speed sensor near the wind turbine (the unit price is about 400 yuan). Use a computer to synchronously measure the generator output voltage and wind speed at intervals (e.g. 5 minutes) and record the data. Then, the two obtained data sets are calculated and analyzed to obtain the generator output power at different wind speeds.
The key here is that you need a multimeter with RS232 output (or other interface), and the voltage signal (or pulse signal) output from the wind speed sensor must be converted before it can enter the computer. .
What is the relationship between wind energy or wind speed and wind energy production? What affects wind energy?
Mechanical anemometers are generally called cup anemometers. There are hemispherical cups and conical cups. For low wind speeds, hemispherical anemometers are better. For high wind speeds, cone anemometers are better. Both have a vertical axis relative to the horizontal plane, and there are also those that have a horizontal axis, such as small wind-powered tankers. There are not many users of wind energy, and it is suitable for situations where the environment is relatively harsh, such as corrosion, low temperature, etc. The accuracy is generally around 0.5 m/s. If the starting torque is large and the wind is too weak to measure it, the measuring range is generally 3-50-70 m/s. It can only measure wind speed in one direction, usually the horizontal direction. Test data has a lot to do with qualityity of the installation. If the installation is not level, the master data will be completely useless and can of course be corrected.
The ultrasonic anemometer, with an accuracy of 0.1 m/s, poses no problem. It is estimated that it can be used between 0 and 100 m/s, and 3 dimensions can be measured simultaneously. Sampling speed is also not a problem. The price is not cheap and can be used for a long time.
Today, half of the wind turbine cabin is equipped with an ultrasonic hemispherical cup and a wind direction indicator.
There are also laser and ultrasonic devices for on-site measurement. The laser anemometer can be placed directly on the ground to measure data at an altitude of 0-200m at a time, and there is no problem with the three-dimensional flow field. The valuable equipment was removed immediately after halfway through the tests. Nobody dareduse it in nature. . .
Wind power relies on wind turbines (also called wind turbines) to capture wind energy. The formula for wind energy is:
P=0.37x10 - 4AV3
<. p>P represents power, the unit is kilowatt [KW]A represents the cross section of the windmill blade, the unit is meter [m]
< p>V represents the average wind speed, the unit is meters per second [m] /s]The formula shows that to obtain greater wind power, one more wind turbine must be used large size to align the wind direction and receive wind with higher average wind speed.
Wind direction and speed are important indicators of wind energy. Generally speaking, wind direction refers to the total average [main direction] of all directions over a ten-minute period, which is marked by sixteen directions [such ase south-southeast, northwest-west]. [duration/time], it can also be described by the scene of the wind blowing in nature. This description is called the Beaufort wind scale.cale].
At present, weather observation stations observe the wind speed eight times a day, and each time the average wind speed within 10 minutes represents the wind speed within three hours, if you want to use wind power, you have to; make more detailed observations; and record them over a long period of time. Understand maximum wind speeds and the conditions under which turbulence occurs. If within 10 minutes there is an instantaneous wind speed greater than this average value of 5 meters/second, we speak of a gust.
For general small wind power generation devices, the required wind start speed is 3 meters/second and the nom speedwind speed is 20 meters/second. It will stop in case of strong winds of 56 meters/second. actually producing electricity, the surface of the wind turbine blades. Each square meter can only generate about 124 W (average wind speed 10 meters/second).