Dual stator induction generator with controllable reactive power capability

Dual stator winding induction generators (DSWIG) can provide controlled excitation and hence offer a brushless alternative to traditional synchronous machines or doubly fed induction machines (where a 2^nd supply is injected to the rotor through a converter-inverter systems). These generators are a potential candidate for extraction of power from renewable energy resources such as wind, micro-hydro etc. as these are very robust and require the least maintenance. Such systems are also suitable for on-grid/off-grid operation in a micro-grid. This paper deals with a model reference adaptive system based reactive power controller. The excitation winding of the DSWIG is fed from an inverter and controlled in synchronism with the power winding to achieve rotor flux orientation and direct reactive power control. Extensive simulations on SIMULINK validate the proposed method.