Voltage regulators for self excited induction generator

When an induction machine is driven from external prime mover at a speed greater than synchronous speed, it acts as induction generator provided reactive power is supplied. This reactive current generates required magnetic field for self-excitation of induction generator (seig). The induction generator thus produced has poor voltage regulation. To get better voltage regulation the reactive current need to be changed suitably during load variation from no load to full load. In stand-alone induction generator the required reactive power is supplied by capacitor bank and reactive power supplied is controlled by various voltage regulating schemes. In this paper different voltage schemes like power electronic controller, electronic load controller and magnetic amplifier are presented.