针对传统滑模控制在双馈风力发电机运行中，在电网电压出现扰动，系统参数发生变化的工况下，讨论了一种基于扩张观测器的非奇异快速终端滑模控制策略。首先，在两相静止坐标系下分析了以有功、无功功率为变量的双馈电机数学模型，同时引入扩张观测器对系统未建模动态、系统耦合项、外部扰动等集总不确定项予以估计；然后采用非奇异终端滑模面代替线性滑模面来削弱滑模抖振并避免奇异问题，并采用改进的滑模控制律代替指数趋近律，从而提高系统的鲁棒性和动态性能；最后，通过MATLAB搭建仿真模型在不同工况下与传统滑模控制进行比较，结果表明，该控制可以削弱功率和电磁转矩的抖振，提高系统的鲁棒性和抗干扰能力。

Regarding the traditional sliding mode control, during the operation of doubly-fed induction generators, under operating conditions where grid voltage disturbances occur and system parameters change. To address the issues of traditional sliding mode control in doubly-fed induction generators(DFIGs) under conditions of grid voltage disturbances and system parameter changes, a non-singular fast terminal sliding mode control strategy based on an extended state observer(ESO) is proposed. A non-singular fast terminal sliding mode control strategy based on extended state observer is proposed. Firstly, the mathematical model of doubly-fed motor with active and reactive power as variables is analyzed in the two-phase static coordinate system. At the same time, an extended observer is introduced to estimate lumped uncertainties such as unmodeled dynamics, system coupling terms and external perturbations. Then, non-singular terminal sliding mode surface is used instead of linear sliding mode surface to weaken sliding mode buffeting and avoid singularity problems, and an improved sliding mode control law is used instead of exponential reaching law to improve the robustness and dynamic performance of the system. Finally, the simulation model built by MATLAB is compared with the traditional sliding mode control under different working conditions. The results show that the control can weaken the buffeting of power and electromagnetic torque, and improve the robustness and anti-interference ability of the system.