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.

中文翻译：

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使用稳健风转矩估计的变速风力涡轮机控制方案

摘要 这项工作为具有双馈感应发电机的变速风力涡轮机系统提出了一种鲁棒控制器。控制器旨在跟踪风力涡轮机的最佳速度，以便从风中提取最大功率。此外，为了避免使用风速传感器，提出了一种鲁棒的空气动力扭矩观测器。该扭矩观测器允许估计控制器使用的气动扭矩，以便计算风力涡轮机的最佳参考速度值。在本方法中应用矢量控制理论，从而使用定子磁链定向控制来控制风力涡轮发电机的速度。所提出的鲁棒控制律基于滑模控制理论，已被证明在系统不确定性下具有良好的性能。已使用李雅普诺夫稳定性理论分析了所提出的控制器在扰动和参数不确定性下的稳定性。最后，实时实验结果表明，一方面，所提出的控制器提供了高性能的动态特性，另一方面，该方案对于此类系统中通常出现的不确定性具有鲁棒性。