Converting the kinetic energy of the wind into mechanical kinetic energy, and then converting the mechanical energy into electrical kinetic energy, is wind power generation. The principle of wind power generation is to use the wind to drive the blades of the windmill to rotate, and then increase the speed of rotation through the speed increaser to promote the generator to generate electricity. According to current windmill technology, it is about three meters per second of breeze speed (the degree of breeze) to start generating electricity. Wind power is becoming a boom in the world because wind power does not use fuel, nor does it generate radiation or air pollution.
The devices required for wind power generation are called wind turbines. This kind of wind turbine can be roughly divided into three parts: the wind wheel (including the tail rudder), the generator and the iron tower. (Large wind power stations basically do not have tail rudders, generally only small (including household types) will have tail rudders)
The wind wheel is an important component that converts the kinetic energy of the wind into mechanical energy. It consists of two (or more) propeller-shaped impellers. When the wind blows to the blades, aerodynamic force is generated on the blades to drive the rotor to rotate. The material of the blade requires high strength and light weight, and currently it is mostly made of glass fiber reinforced plastic or other composite materials (such as carbon fiber). (Now there are also some vertical wind rotors, S-shaped rotating blades, etc., whose functions are also the same as those of conventional propeller blades)
Because the rotational speed of the wind rotor is relatively low, and the magnitude and direction of the wind force often change, which makes the rotational speed unstable; therefore, before driving the generator, a gear box must be attached to increase the rotational speed to the rated rotational speed of the generator. A speed regulating mechanism is added to keep the speed stable, and then it is connected to the generator. In order to keep the wind rotor always aligned with the wind direction to obtain the maximum power, it is also necessary to install a rudder similar to the wind vane behind the wind rotor.
The iron tower is the frame that supports the wind wheel, the tail rudder and the generator. It is generally built relatively high, in order to obtain greater and more uniform wind force, but also to have sufficient strength. The height of the tower depends on the influence of ground obstacles on the wind speed and the diameter of the wind rotor, which is generally within the range of 6-20 meters.
The function of the generator is to transfer the constant rotational speed obtained by the wind wheel to the power generating mechanism to run evenly through the speed increase, thus converting the mechanical energy into electrical energy.
Wind power is popular in countries such as Finland and Denmark; China is also strongly promoting it in the western region. The small wind power generation system is very efficient, but it is not composed of only one generator head, but a small system with certain technological content: wind generator + charger + digital inverter. A wind turbine consists of a nose, a swivel, a tail, and blades. Each part is very important, and the functions of each part are: the blades are used to receive the wind and turn into electrical energy through the nose; the tail makes the blades always face the direction of the incoming wind to obtain the maximum wind energy; the swivel can make the nose flexibly rotate to achieve The function of adjusting the direction of the tail; the rotor of the nose is a permanent magnet, and the stator windings cut the magnetic lines of force to generate electricity.
Generally speaking, the tertiary wind has the value of utilization. But from an economical and reasonable point of view, wind speed greater than 4 meters per second is suitable for power generation. According to the determination, a 55-kilowatt wind turbine, when the wind speed is 9.5 meters per second, the output power of the unit is 55 kilowatts; when the wind speed is 8 meters per second, the power is 38 kilowatts; when the wind speed is 6 meters per second, only 16 kilowatts; and when the wind speed is 5 meters per second, it is only 9.5 kilowatts. It can be seen that the greater the wind, the greater the economic benefits.
Jiangsu Haili Wind Power Equipment Technology Co., Ltd.
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