Adaptive disturbance rejection control scheme for DFIG-based wind turbine

In this paper a new control structure is presented to extract maximum power from a wind regime. In this novel approach a higher order sliding mode controller is designed to generate an optimal reference trajectory for the output power. This may be achieved by tracking the optimal tip speed ratio with manipulating the voltages of the rotor in the Doubly-Fed Induction Generator (DFIG) configuration. The presented structure improves performance under abrupt changes in the wind speed, and can be used for any type of optimum active power tracking algorithms. The simulations shows the significant improvement in performance of the nonlinear discrete-time backstepping controller utilizing this technique.