Doubly-fed induction machine as generator in wind power plant: nonlinear control algorithms with direct decoupling

Currently the doubly fed induction machine (DFIM) is often used in wind power plants. The digital rotor current controller is always based on DFIM models linearized within a sampling period which does not correspond to the nonlinear nature of the DFIM. The paper deals with a nonlinear control scheme with direct decoupling and presents some first investigation results. This new controller helps to improve ride-through of the wind turbine during grid faults