Enhanced power capture for the wind turbine system via a novel second-order nonsingular fast terminal sliding mode control strategy

Systems with fast dynamics require controllers that can handle rapid fluctuations and chattering issues. Selecting an appropriate sliding manifold is crucial for ensuring finite-time convergence and reducing chattering in nonlinear systems. This article develops a new proportional-integral-derivative (PID)-based nonsingular fast terminal second-order sliding controller (NFTSOSMC) to minimize tracking error and enhance wind power generation for variable-speed wind turbines. The proposed sliding manifold ensures finite-time convergence without singularities and effectively attenuates chattering by smoothing control signals. As a result, it limits rapid fluctuations, attenuates mechanical wear, and enhances the lifespan of the wind turbine system. The designed controller also minimizes steady-state error and enhances robustness against external disturbances. Simulation results demonstrate the effectiveness of the proposed method in maximizing wind power capture and maintaining system stability under fast wind speed variations.