High performance controller for DFIG of grid connected wind turbines

This paper presents a high performance stationary frame non-linear controller for DFIG which improves the behavior of the grid connected wind turbines especially during asymmetric disturbances at the PCC. A controller design procedure that guarantees the DFIG stability under uncertainties and disturbances at grid side is presented in details. Furthermore, it is demonstrated in the paper that with the proposed controller different goals such as control of grid side active and reactive power, minimization of torque pulsation under unbalance operation and improvement of the low voltage ride through capability can be easily achieved. Simulations and experimental results are given to illustrate the good performance of a grid connected DFIG with the proposed controller.