Robust control of wind turbines based on fractional nonlinear disturbance observer

AbstractIn order to assure maximum energy conversion, the angular velocity of the wind turbine rotor tracks a nominal profile depending on the wind speed. However, conventionally, wind flows present nondifferentiable components due to turbulence and gust winds, which affect the wind energy management. Thus, a fast and robust controller is required to induce such nominal regime for maximum energy transfer. A fractionalorder nonlinear disturbanceobserver (FNDOB) is proposed in this paper to cancel the nondifferentiable components of the wind speed, as well as dynamic uncertainties and other aerodynamic disturbances. The proposed FNDOB is based on continuous fractional sliding modes, assuring that disturbances and uncertainties are exactly compensated in finitetime. A representative simulation study for a variablespeed wind turbine is presented to show the reliability of the proposed scheme, and a comparative analysis with respect to a conventional linear disturbance observer based control is presented.

Munoz-Vazquez, A. J., Parra-Vega, V., Sanchez-Orta, A., Romero-Galvan, G., & Lara-Alabazares, D.

Munoz-Vazquez, Aldo Jonathan||Parra-Vega, Vicente||Sanchez-Orta, Anand||Romero-Galvan, Gerardo||Lara-Alabazares, David

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