Robust speed controller design for the variable-speed wind turbine power system

Abstract

The use of an appropriate control scheme can greatly boost the performance of the wind energy systems. The wind power systems that are connected to the grid side contain highly nonlinear characteristics and therefore, demand robust control scheme for their proper operation. The classical control schemes do not provide robustness against the nonlinearities and uncertainties present in the system. In this article, a robust sliding mode controller (SMC) is being designed and analyzed for regulating the speed of the wind turbine system in the existence of unmodeled dynamics, external perturbations and system uncertainties. The controller stability is given using the theory of Lyapunov stability. The designed controller performance is also compared to classical control techniques. The designed controller shows a better system response with the elimination of the steady state error and good robustness against system uncertainties.