Variable speed wind turbine control scheme using a robust wind torque estimation. (April 2019)

• Record Type: Journal Article
• Authors: Barambones, Oscar; Cortajarena, Jose A.; Calvo, Isidro; Gonzalez de Durana, Jose M.; Alkorta, Patxi; Karami-Mollaee, A.
• Is Part Of: Renewable energy. Volume 133(2019)
• Page Start: 354
• Page End: 366
• Publication Date: 2019-04
• Subjects: Renewable energy -- Wind energy -- Sliding mode observer -- Sliding mode control -- DFIG -- Lyapunov stability; Renewable energy sources -- Periodicals; Power resources -- Periodicals; Énergies renouvelables -- Périodiques; Ressources énergétiques -- Périodiques; 333.794
• DOI: 10.1016/j.renene.2018.10.009
• Languages: English
• ISSNs: 0960-1481

Abstract

Abstract: This work proposes a robust controller for a variable speed wind turbine system with a doubly feed induction generator. The controller aims at tracking the optimal speed of the wind turbine so that extracts the maximum power from the wind. Also, a robust aerodynamic torque observer is proposed in order to avoid the use of wind speed sensors. This torque observer allows to estimate the aerodynamic torque to be used by the controller in order to calculate the value of the optimal reference speed for the wind turbine. The vector control theory is applied in the present approach, and thereby the stator flux-oriented control is used for controlling the speed of the wind turbine generator. The proposed robust control law is based on sliding mode control theory, which has proved to provide good performance under system uncertainties. The stability of the proposed controller under disturbances and parameter uncertainties has been analyzed using the Lyapunov stability theory. Finally, real time experimental results show that, on the one hand, the proposed controller provides high-performance dynamic characteristics, and on the other hand, this scheme is robust with respect to the uncertainties that usually appear in this kind of systems. Highlights: A real time sliding mode control for variable speed wind turbine system is proposed. The turbine speed is adjusted as a function of the wind velocity to maximize the output power. A robust aerodynamic torque observer is proposed in order to avoid the use of wind speed sensors. The Lyapunov theory is employed in order to demonstrate the closed loop stability. The performance of this control scheme has been validated in a text bench that we have designed and constructed.