Modified vector controlled DFIG windenergy system based on barrier functionadaptive sliding mode control

Increased penetration of wind energy systems has serious concerns on power system stability. In spite ofseveral advantages, doubly fed induction generator (DFIG) based wind energy systems are very sensitive togrid disturbances. DFIG system with conventional vector control is not robust to disturbances as it is basedon PI controllers. The objective of this paper is to design a new vector control that is robust to externaldisturbances. To achieve this, inner current loop of the conventional vector control is replaced with slidingmode control. In order to avoid chattering effect and achieve finite time convergence, the control gains areselected based on positive semi-definite barrier function. The proposed barrier function adaptive slidingmode (BFASMC) is evaluated by testing it on a benchmark multi-machine power system model under variousoperating conditions. The simulated results show that the proposed method is robust to various disturbances.