The principle of using wind energy is to convert mechanical energy into electrical energy. The wind blows on the blades and the wind speed is about 3m/s~5m/s, which is very low. The blades drive the low-speed rotating shaft, and the low-speed rotating shaft drives the speed-increasing gearbox. , which increases the speed and transmits it to the shaft at high speed. The high-speed shaft drives the generator to produce electricity.
Why do all wind power generation devices have three leaves?
One rotation of the windmill can generate 1.96 kilowatt hours of electricity.
Different motors have different power ratings. When wind power is relatively stable, it can generally generate 2,000 degrees of electricity in 60 minutes, on average, it can generate 0.56 degrees of electricity per second. and a turn The quantity of electricityThe energy that can be generated is 1.96 kWh. Of course, this data is not completely accurate and will be affected by the influence of wind and the stresses of the generator itself. Solar energy technology is not sufficiently mature and has not been used on a large scale due to its relatively high level. cost.
But many people are still engaged in research in this energy field, and this energy will also bring great changes to people's lives in the future. In the future, those with low conversion rates will. harmful to the environment. There will also be negative effects on how electricity production will be gradually changed.
The principle of wind power generation
The principle of wind power generation is to use wind energy to rotate the blades of the wind turbine, then increase the speed of rotationtion using a speed multiplier to cause the generator to produce electricity. The blades are used to receive wind energy and convert it into electrical energy through the nose. The tail allows the blades to always face the direction of the incoming wind to obtain maximum wind energy. The pivot allows the nose to rotate flexibly to realize wind power. Tail direction adjustment function. The nose rotor is permanent magnet, the stator windings cut the magnetic lines of force to generate electrical energy.
As the wind volume is unstable, the wind turbine produces 13-25V alternating current, which needs to be rectified by the charger, and then the battery is charged, so that the electrical energy generated by the wind turbine is converted into chemical energy. Then use an inverter with a protection circuit to convert the chemical energy from the battery into mains powerAC 220V to ensure stable use.
Actually, there are single-blade and two-blade wind turbines. But the most common number of blades in modern wind turbines is three, the result of compromises between various aspects and parameters during the design process. These aspects include, but are not limited to: aerodynamics, energy conversion efficiency, manufacturing and maintenance costs, system reliability, noise and aesthetics. From a simple analysis of technical parameters, a larger number of blades can:
(1) Increase mechanical torque;
(2) Increase power output;
(3) Reduce the maximum rotation speed;
(4) Increase manufacturing costs and make maintenance more complicated and difficult. Therefore, motors with a large number of blades are more suitable for operation in low-speed locations, such as water pumps and motors.rs of grain grinding. Wind turbines expect the blades to rotate at relatively high speeds, so the size of the generator located in the center of the blades (at the top of the tower) does not need to be large. It can meet the network frequency requirements. Additionally, wind speeds generally increase at higher altitudes. As the wind turbine tower is very high, the blades are also very long (40m-60m*). There is a significant difference in wind speed between blades rotating to a high position and blades rotating to a low position. If the generator has only two blades, then when the blades rotate, one in the up position and one in the down position, their stress is obviously not uniform enough, so a stronger, more stable tower must be designed to maintain the generator and blades. The three-blade generator can alleviate this imbalance to some extent, allowing it to operateeasier. Smooth means less noise and less wear.