Design of a Robust µ-synthesis controller for Uncertain and Disturbed Nonlinear Wind turbines

This work proposes a novel robust linear output-feedback controller that aims to ensure the closed-loop stability and disturbance reduction in nonlinear wind turbine systems. The developed approach uses the numerical µ-synthesis and mixed µ-synthesis methods to design the robust controller. Since the designed controller is linear, its implementation has a low online computational burden. Also, only measurements of the wind turbine are used in the control feedback law, thus eliminating the need for any additional sensors or signal processing methods to acquire the state vector information. In this control method, the wind turbine's parameter uncertainties and external disturbances are well treated by means of robust stability and good tracking. Simulation results indicate the high performance of the proposed controller. Further comparison with a
$H$
∞
control approach, confirmed its superior performance, especially in terms of the fast convergence rate of the controlled outputs to their desired values.