This article proposes a Fuzzy Second Order Integral Terminal Sliding Mode (FSOITSM) control approach for DFIG‐based wind turbines subject to grid faults and parameter variations. Since traditional terminal sliding mode control (SMC) suffers from singularity, a novel integral terminal sliding manifold is proposed to eliminate chattering and improve the wind turbine's performance in the presence of faults and disturbances. A fuzzy system is proposed to auto‐tune the controllers' gains and ensures the invariance of the sliding surfaces even under heavy uncertainties, thus further improving the reliability and performance of the proposed controller. The performance of the proposed approach was assessed under various operating conditions. A comparison analysis with a standard SMC approach as well as the state of the art in voltage sag mitigation was also carried over. Reliability, robustness, and power availability under faulty grid conditions are among the main features of the proposed approach. In addition, the proposed approach exhibited chattering free dynamics and enabled the finite time convergence of the sliding manifold and overcame the singularity problem associated with standard TSMC.

中文翻译：

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基于DFIG的风能系统的无抖动整体终端滑模方法设计

本文针对遭受电网故障和参数变化的基于DFIG的风力涡轮机，提出了一种模糊的二阶整体终端滑模（FSOITSM）控制方法。由于传统的终端滑模控制（SMC）存在奇异之处，因此提出了一种新颖的整体式终端滑阀歧管，以消除颤振并在存在故障和干扰的情况下提高风力发电机的性能。提出了一种模糊系统来自动调节控制器的增益，即使在不确定性很大的情况下也能确保滑动面的不变性，从而进一步提高了所提出控制器的可靠性和性能。在各种操作条件下评估了建议方法的性能。还进行了与标准SMC方法的比较分析以及缓解电压骤降的最新技术。电网故障情况下的可靠性，鲁棒性和电源可用性是该方法的主要特征。另外，所提出的方法表现出颤抖的自由动力学，并且使得滑动流形的有限时间收敛，并且克服了与标准TSMC相关的奇异性问题。