Although the speed of wind power generation is slow, the fans used in wind power generation are very large. This type of fan can generate a lot of force with each rotation. This will therefore produce electricity.
Wind turbines use wind energy to turn machines, driving the generator rotor and causing the stator to produce electrical energy. There are two types of wind turbines: medium-high speed dual-feed type and low-speed permanent magnet type. The dual-feed unit is equipped with a gearbox that can change the speed of the blades from a low speed to over $1,000. a dozen revolutions at medium-high speed (above a thousand revolutions) to adapt to the generator to produce electricity.
The low speed permanent magnet generator can operate at a low speed of more than ten revolutionss due to its large number of magnetic poles and its ability to convert low-frequency electrical energy into industrial frequency electrical energy through a frequency converter for use. Therefore, although the wind speed is high, the rotation speed of the blade is very low, but suitable electrical energy can be produced and used using mechanical and electrical methods.
In single-phase power supply, the generator power is P=UIcosΦ. In three-phase power supply, the generator power is P=1. In three-phase power, the power is divided into. three types: power P and no power Q and apparent power S. The cosine of the phase difference (Φ) between voltage and current is called power factor, represented by the symbol cosΦ. Numerically, the power factor is the ratio between active power and apparent power.
That is to say that cosΦ=P/S. Lhe three powers and the power factor cosΦ are a right-angled power triangle relationship: the two right-angled sides are the power P and the non-power Q, and the hypotenuse is the apparent power S. In a three-phase load, these three powers always exist at the same time: S=P+Q S=√(P+Q) Apparent power S=1 Power P=1 No power Q=1 Power factor cosΦ=P/ S .
Notes
The main sources of wind are gravity and the sun. The sun causes uneven heating of the ground and atmosphere, leading to differences in density between atmospheres. of gravity, an atmospheric circulation is formed. The gas flow forms wind, which acts on the blades of the wind turbine, causing the blades to rotate, similar to a water turbine, and then drives the generator to do work, converting the wind energy into electrical energy.
The principle of wind energy production is actually the samethan that of hydroelectric production. They convert the mechanical energy existing in nature into electrical energy, which is an easy to transport and different form of use. , he benefits from the discovery of the electromagnetic effect.
The source of mechanical energy is due to the existence of Earth's gravity. The greater the water drop, the higher the pressure and the higher the efficiency of the generator drive. Hydroelectricity production begins with a hydraulic turbine. It is directly influenced by water, then the hydraulic turbine drives the generator.
Reference for the above content: Baidu Encyclopedia-Wind Turbine