Quasi-steady-state rotor EMF-oriented vector control of doubly fed winding induction generators for wind-energy generation

A novel control strategy of the DFIG, defined by the authors as quasi-steady-state rotor EMF orientated vector control, is proposed. The method combines the steady-state analysis with the instantaneous sampling and control. The finite impulse response filter (FIR) is used in the rotor EMF orientation. Compared with the other position sensorless schemes, this method uses only the rotor voltage and current as the feedback signals, which substantially reduces the costs and enhances the reliability. A simulation shows good response of the system. Experiments based on a 3 kW unit have demonstrated the correctness and availability of the scheme.