Diagram of Squirrel Cage Induction Generator (SCIG):
Explanation (Operation):- In this system multistage gearbox is used to obtain constant speed irrespective of wind speed. SCIG require reactive excitation power. The SCIG takes the reactive excitation power from a capacitor bank, connected across the stator terminals of the IG Rotor of SCIG is rotated at more than synchronous speed(i.e. low negative slip) to generate emf (to export power)with the help of wind power. Generated voltage is 690 V AC. So it must be step up to 33 KV to connect to power grid.