Hybrid control of DFIG using multicellular converters

In this paper, the authors propose the hybrid control of Doubly Fed Induction Generator DFIG connected by rotor side to three multicellular converters. Each converter is considered with two cells and represented as a hybrid system with four modes of operation. Indirect control of stator active and reactive powers is used in order to generate the references of rotor currents in d-q axis reference frame. These currents will be maintained using hybrid control based on the determination of switching sequences from a mode of the converters to another based on the dynamics of the converter modes. The developed hybrid controllers allow decoupled control of the rotor currents.