Converting the kinetic energy of the wind into mechanical kinetic energy, and then converting the mechanical energy into electric kinetic energy, this is wind power generation. The principle of wind power generation is to use the wind to drive the windmill blades to rotate, and then increase the speed of rotation through a speed increaser to promote the generator to generate electricity. According to windmill technology, at a breeze speed of about three meters per second (the degree of breeze), electricity can be started. Wind power is forming a boom in the world, because wind power does not use fuel, and it does not produce radiation or air pollution. [5]
The equipment required for wind power generation is called a wind turbine. This kind of wind power generator can be divided into three parts: wind wheel (including tail rudder), generator and tower. (Large wind power plants basically do not have a tail rudder, generally only small (including household type) will have a tail rudder)
The wind wheel is an important component that converts the kinetic energy of the wind into mechanical energy. It is composed of several blades. When the wind blows on the blades, aerodynamic force is generated on the blades to drive the wind wheel to rotate. The material of the blade requires high strength and light weight, and it is mostly made of glass fiber reinforced plastic or other composite materials (such as carbon fiber). (There are also some vertical wind wheels, s-shaped rotating blades, etc., whose function is also the same as that of conventional propeller blades)
Because the speed of the wind wheel is relatively low, and the magnitude and direction of the wind often change, which makes the speed unstable; therefore, before driving the generator, it is necessary to add a gear box that increases the speed to the rated speed of the generator. Add a speed regulation mechanism to keep the speed stable, and then connect it to the generator. In order to keep the wind wheel always aligned with the wind direction to obtain the maximum power, a rudder similar to the wind vane needs to be installed behind the wind wheel.
The iron tower is the structure supporting the wind wheel, the rudder and the generator. It is generally built to be relatively high in order to obtain a larger and more uniform wind force, but also to have sufficient strength. The height of the tower depends on the impact of ground obstacles on the wind speed and the diameter of the wind wheel, generally within 6-20 meters.
The function of the generator is to transfer the constant rotation speed obtained by the wind wheel to the power generating mechanism through the speed increase, thereby converting the mechanical energy into electric energy.
Wind power is very popular in Finland, Denmark and other countries; China is also vigorously promoting it in the western region. The small wind power generation system is very efficient, but it is not only composed of a generator head, but a small system with a certain technological content: wind generator + charger + digital inverter. The wind turbine is composed of a nose, a rotating body, a tail, and blades. Each part is very important. The functions of each part are: the blades are used to receive wind and turn into electrical energy through the nose; the tail keeps the blades always facing the direction of the incoming wind to obtain the maximum wind energy; the rotating body enables the nose to rotate flexibly to achieve The function of the tail wing to adjust the direction; the rotor of the nose is a permanent magnet, and the stator winding cuts the magnetic field lines to generate electricity.
Generally speaking, the third-level wind has the value of utilization. However, from an economically reasonable point of view, wind speeds greater than 4 meters per second are suitable for power generation. According to measurements, 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.
In our country, many successful medium and small wind power generation devices are already in operation.
my country’s wind resources are extremely rich. The average wind speed in most areas is above 3 meters per second, especially in the northeast, northwest, and southwest plateaus and coastal islands. The average wind speed is even higher; in some places, it is more than one-third a year The time is windy. In these areas, the development of wind power generation is very promising
Post time: Sep-27-2021
