Articles | Volume 2, issue 2
Wind Energ. Sci., 2, 615–640, 2017
Wind Energ. Sci., 2, 615–640, 2017

Research article 19 Dec 2017

Research article | 19 Dec 2017

Wind inflow observation from load harmonics

Marta Bertelè1, Carlo L. Bottasso1,2, Stefano Cacciola2, Fabiano Daher Adegas3, and Sara Delport3 Marta Bertelè et al.
  • 1Wind Energy Institute, Technische Universität München, 85748 Garching bei München, Germany
  • 2Dipartimento di Scienze e Tecnologie Aerospaziali, Politecnico di Milano, 20156 Milan, Italy
  • 3GE Global Research, 85748 Garching bei München, Germany

Abstract. The wind field leaves its fingerprint on the rotor response. This fact can be exploited by using the rotor as a sensor: by looking at the rotor response, in the present case in terms of blade loads, one may infer the wind characteristics. This paper describes a wind state observer that estimates four wind parameters, namely the vertical and horizontal shears and the yaw and upflow misalignment angles, from out-of-plane and in-plane blade bending moments. The resulting observer provides on-rotor wind inflow characteristics that can be exploited for wind turbine and wind farm control. The proposed formulation is evaluated through extensive numerical simulations in turbulent and nonturbulent wind conditions using a high-fidelity aeroservoelastic model of a multi-MW wind turbine.

Short summary
The rotor of a wind turbine is used to determine some important parameters of the wind, including the direction of the wind vector relative to the rotor disk and horizontal and vertical shears. The method works by using measurements provided by existing onboard load sensors. The observed wind characteristics can be used to implement advanced features in smart wind turbine and wind farm controllers.