An hybrid control based on fuzzy logic and a second order sliding mode for MPPT in wind energy conversion systems

Abstract

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