SECOND ORDER SLIDING MODE CONTROL OF A DUAL-ROTOR WIND TURBINE SYSTEM BY EMPLOYING A MATRIX CONVERTER

Abstract

This paper deals with a variable speed device to produce electrical energy on a power network, based on a doubly-fed induction generator (DFIG) fed by a matrix converter and driven by dual rotor wind turbine. The scientific literature indicates that a dual-rotor wind turbine (DRWT) system could extract additional 20-30% power compared to a single rotor wind turbine (SRWT) system from the same wind stream. In the first place, we study the aerodynamic model of DRWT. In the second place, we carried out a study of modelling on the matrix converter controlled by the Venturini modulation technique and we developed a model of the doubly fed induction generator. In order to control the power flowing between the stator of the DFIG and the power network, a control law is synthesized using two types of controllers: PI and second order sliding mode (SOSMC). Their respective performances are compared in terms of power reference tracking, response to sudden speed variations, sensitivity to perturbations and robustness against machine parameters variations.