Asynchronous generator excited by current controlled voltage source inverter using rotor field oriented control

This paper presents a strategy used to appropriately excite and control the desired output active power of an asynchronous generator fed by a current controlled three-phase voltage source inverter. A dc voltage control loop, with a classical PI controller, is used to maintain at a reference value the dc bus voltage of the source inverter under a large rotor speed variation. The proposed asynchronous generator control strategy is developed using rotor field orientation technique and carried out by a digital signal processor (dsp). The proposed control strategy and adopted system models are validated by numerical simulation and experimental results obtained from a laboratory prototype.