Enhanced Funnel Control Strategies for Wind Turbine Speed Regulation – FC Symmetric with scaling.

Abstract

This paper investigates a symmetric Funnel Control (FC) strategy enhanced with a gain scaling mechanism for wind turbine speed regulation. The proposed approach guarantees prescribed transient and steady-state performance by constraining the tracking error within identical upper and lower performance boundaries. Unlike classical funnel control, which offers limited tuning flexibility, the gain-scaled symmetric FC introduces an additional tuning parameter that significantly improves transient behavior while preserving stability and constraint satisfaction. A nonlinear wind turbine model including aerodynamic torque and drivetrain dynamics is considered. Simulation results obtained in MATLAB/Simulink demonstrate that increasing the scaling gain leads to substantial reductions in rise time, settling time, and tracking error. Quantitative performance indices such as IAE, ITAE, MSE, RMSE, and AMSE confirm the effectiveness of the proposed strategy. The results highlight the suitability of symmetric gain-scaled funnel control for practical wind energy applications operating under uncertainty and variable wind conditions