S-curve speed control for variable speed wind energy converters

In this paper, a novel non-linear method for the operation management, which is designed and investigated by simulation and experiments at a test bed for speed variable wind energy converters, will be described and compared to other MPP-Tracking methods. The novel method allows a dynamical speed flexibility around the estimated optimal operation point, so that additional to an operation with the maximal possible efficiency of wind rotor a smoothing of power output variations caused by the wind is achieved.