Maximum power point tracking of DFIG-WT using feedback linearization control based current regulators

This paper presents a neotype control strategy for maximum power point tracking (MPPT) of doubly-fed induction generator based wind turbine (DFIG-WT). The strategy adopts proportional-integral (PI) based regulators and feedback linearization control (FLC) based regulators in the power and current control loops of DFIG, respectively. The FLC based regulator can fully decouple and linearize the nonlinear system and provide optimal control performance in a wide range operating conditions. However, since the FLC strategy might require some unaccessible state variables of the mechanical system, the PI based regulators are able to simplify the control implementation in the power loop. Simulation studies are undertaken in a single-machine system operating under ramp-change and random wind profiles, respectively. Simulation results reveal that the proposed strategy performs better than the conventional vector control (VC) scheme under varying operation conditions.