An Hybrid Control Based on Fuzzy Logic and a Second Order SlidingMode for MPPT in Wind Energy Conversion Systems

摘要

This paper deals with power control of a grid connected variable speed wind turbinesystem, based on doubly fed induction generator. In this paper we propose a novel controlscheme of the rotor side converter, that is based on indirect control of power consist currentsand powers control loops. The two loops of rotor currents: direct and quadrature component arecontrolled by the technique of the second order sliding mode using the super-twistingalgorithm in order to eliminate the chattering phenomenon. A fuzzy logic controller is appliedto the active and to the reactive powers loops exchanged between the stator of the doubly fedinduction generator and the grid to track the maximum power point. In order to maintain thevoltage of the DC-link constant of the grid side converter, the classical proportional integralcontroller is used. The proposed control strategy, which combines the second order slidingmode and fuzzy logic, is applied to a 1.5 MW three blade wind turbine shows robustness forvariations in the wind speed.