中文摘要：

在变速恒频双馈风力发电机组最大风能捕获的研究中，为克服机组模型的非线性、强耦合性和参数不确定性对控制精度的影响，提出一种基于二阶滑模超螺旋算法的控制策略。设计两个二阶滑模控制器，通过调节发电机转子电压，跟踪风机最优转速和转子电流设定值，实现额定风速以下的最大风能捕获和无功功率调节。仿真结果表明，二阶滑模控制策略的鲁棒性强，动态响应迅速，跟踪效果好，能有效地实现控制目标。同时削弱了传统滑模控制的抖振问题，降低了机械磨损，提高了控制精度。

英文摘要：

This paper proposed a super-twisting second order sliding mode control scheme to overcome the effects on the accuracy of maximum wind energy capture, which are caused by non-linear strong coupling, and parameter perturbation of the doubly fed induction generator based variable speed wind turbine system. Two second order sliding mode controllers were designed to achieve the control objectives. By regulating the generator rotor voltage, one con- troUer tracked the wind turbine optimal rotor speed, which can maximize the power generation. The other maintained the rotor current at rated value to minimize the reactive power. Simulation results demonstrate that the proposed con- trol strategy shows strong robustness, fast dynamic response, good tracking performance, and the control objectives are successfully achieved. Meanwhile, the chattering phenomenon of sliding mode control is whittled, the mechanical stress is reduced, and higher control accuracy is approached.