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Discrete-Time Robust Control of Variable Speed Wind Turbine Using Quantitative Feedback Theory

A discrete-time robust controller for the variable speed wind turbine (VSWT) is designed in this paper. The two-mass model of VSWT (TMMV) has been considered for the proposed control design to extract the maximum power from the wind. The discretized TMMV (DTMMV) has been obtained using Euler method. An efficient and effective robust control technique namely discrete quantitative feedback theory (DQFT) is used for the specified range of parametric uncertainty and specifications in the frequency domain. The proposed controller satisfies the robust performance, sufficient gain and phase margins, process and measurement noise attenuation, and fast convergence. Finally, the robust stability and robust tracking performance has been demonstrated through simulation studies of the proposed control scheme in the presence of uncertainty.