The principle of wind power generation

- Aug 23, 2018-

The principle of wind power generation is to use wind power to drive the rotation of the windmill blades, and then increase the speed of rotation by the speed increaser to promote the generator to generate electricity.

 

Generator structure

Wind turbines are power machines that convert wind energy into mechanical work, also known as windmills. Broadly speaking, it is an energy utilization machine that uses the atmosphere as a working medium.

Cabin: The cabin contains key equipment for wind turbines, including gearboxes and generators. Maintenance personnel can enter the cabin through the wind turbine tower. At the left end of the nacelle are wind turbine rotors, ie rotor blades and shafts.

Rotor blades: catch wind and transmit wind power to the rotor shaft. On modern 600 kW wind turbines, each rotor blade measures about 20 meters in length and is designed much like an airplane's wing.

Axis: The rotor axis is attached to the low speed shaft of the wind turbine.

Low speed shaft: The low speed shaft of the wind turbine connects the rotor shaft to the gearbox. On modern 600 kW wind turbines, the rotor speed is quite slow, about 19 to 30 revolutions per minute. There are conduits for the hydraulic system in the shaft to activate the operation of the aerodynamic brake.

Gearbox: The left side of the gearbox is the low speed shaft, which increases the speed of the high speed shaft to 50 times the low speed shaft. High-speed shaft and its mechanical brake: The high-speed shaft runs at 1500 rpm and drives the generator. It is equipped with an emergency mechanical brake for when the aerodynamic brake fails or when the wind turbine is being serviced.

Generator: Usually called induction motor or asynchronous generator. On modern wind turbines, the maximum power output is typically between 500 and 1500 kW. Yaw device: Rotate the nacelle with the motor so that the rotor is facing the wind. The yaw device is operated by an electronic controller that can sense the wind direction through the wind vane. The figure shows the yaw of the wind turbine. Usually, when the wind changes its direction, the wind turbine will only deflect a few degrees at a time.

Electronic controller: Contains a computer that constantly monitors the state of the wind turbine and controls the yaw device. To prevent any malfunction (ie overheating of the gearbox or generator), the controller can automatically stop the rotation of the wind turbine and call the wind turbine operator via a telephone modem.

Hydraulic system: An aerodynamic brake used to reset a wind turbine.

Cooling element: Contains a fan for cooling the generator. In addition, it contains an oil cooling element for cooling the oil in the gearbox. Some wind turbines have water cooled generators.

Tower: The wind turbine tower carries the nacelle and rotor. Usually tall towers have an advantage because the higher the ground, the greater the wind speed. Modern 600 kW wind turbines have tower heights of 40 to 60 meters. It can be a tubular tower or a lattice tower. Tubular towers are safer for maintenance personnel as they can reach the top of the tower through an internal ladder. The advantage of a latticed tower is that it is relatively inexpensive.

Anemometer and wind vane: used to measure wind speed and direction

 

Advantage

Wind power uses natural energy. Relative to thermal power, nuclear power and other power generation should be more green and environmentally friendly.