Observer-based Complete DFIG Wind Turbine Control

This paper proposes a novel Doubly Fed Induction Generator (DFIG) control approach using an optimized set of observers. Firstly, an Adaptive Disturbance Rejection Scheme (ADRS) based on a Model Reference Adaptive System (MRAS) observer is applied to estimate generator speed. Secondly, a Fuzzy Logic MPPT controller is designed to optimized power conversion. Finally to achieve the overall sensor-less control, speed, current and DC-voltage control laws are achieved using a novel version of ADRS while taking into account the power loss in the system. The technique is evaluated for a 1.5MW DFIG under grid voltage dip and parameter variation and compared with the conventional PI-controller.