Suppose wind speed v air density ρ generator fan blade radius r
The air mass hitting the fan blades within t time is m=ρπr^2vt, and the energy obtained by the fan blades is e=1/2mv^ 2=1/2ρπr^2v^3t
p0=e/t=1/2ρπr^2v^3
Suppose the generator efficiency η
Wind power generation The generated power p=1/2ηρπr^2v^3
Among all wind energy generators, according to the power of the wind energy generator, the electric energy generated by the wind energy generator each time varies. Not the same.
For example, the most common 2MW direct-drive wind energy generator, when the wind energy is sufficient and stable, can generate 2,000 degrees of electricity every 60 minutes, and each rotation of the fan blades requires 3.5 seconds, 60 minutes, is 3600 seconds, so the electricity generated by the generator per second is 0.56 kilowatt-hours. Then the electricity generated by the fan of the wind energy generator for each rotation is 0.56 × 3.5 seconds, which is 1.94 kilowatt-hours.
Extended information
Generator principle
The principle of wind power generation is to use wind power to drive the windmill blades to rotate, and then through the The speed machine increases the speed of rotation to prompt the generator to generate electricity. According to current wind turbine technology, power generation can start at a breeze speed of about three meters per second (the level of breeze).
Due to the unstable air volume, the wind turbine outputs alternating current of 13 to 25V, which must 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 power supply with a protection circuit to convert the chemical energy in the battery into AC 220V mains power to ensure stable use.