What is induction generator..why are it used in wind mill..what is the reason..?

Question

What is induction generator..why are it used in wind mill..what is the reason..?

Answer 1

An induction generator is simply an electrical generator. A windmill uses one to convert mechanical energy it harvests from the wind into electrical energy.

Answer 2

An induction generator is an induction motor used as a generator. Through electromagnetic induction, the stator current induces magnetizing current to flow in the rotor. An induction machine is mechanically less complicated and less expensive than a synchronous machine. It requires a complex electronic inverter, but that is required for any generator that must operate at variable speeds but provide power at a constant frequency. Compared to a synchronous generator, an induction generator does not require the electronic control to respond quite as quickly when the wind speed changes.

Edit 1

Induction machines operate slightly below (motor) or above (generator) synchronous speed. The difference between synchronous speed and operating speed is called slip. In a wind turbine, the slip allows a slight propeller speed change to occur without changing the electrical frequency.

If the wind turbine is equipped with a variable speed transmission to provide constant generator speed with variable propeller speed, the slip of the induction generator reduces mechanical stress and allows time for the transmission to respond to wind speed changes.

If you search “induction generator” and “asynchronous generator” you will find a lot of information such as:

http://www.windpower.org/en/tour/wtrb/as...

http://www.mpoweruk.com/generators.htm