湍流风激励场景下双馈风力发电系统轴系传动链在低频段存在宽频受迫扭振问题，影响机组稳定运行。提出了扭振抑制的MRAC(Model Reference Adaptive Control,模型参考自适应控制)方法，建立了考虑最优转矩控制和带通滤波器参数的轴系宽频受迫扭振模型，利用系统输入量和输出量设计前馈控制器和自适应控制律，避免了传动链状态变量不易测量的难题，使向双馈风力发电系统传动链提供主动阻尼的带通滤波器主要参数进行自适应调节，最终传动链动态响应跟踪稳定的参考模型。以1.5MW双馈风力发电系统为例，在持续性湍流风激励场景下，仿真验证MRAC的跟踪效果，对比电气阻尼重塑方法和MRAC方法对宽频受迫扭振的抑制性能。结果表明，所提出的MRAC方法能够使被控对象稳定跟踪参考模型，跟踪平均误差不超过4.94%；相比于电气阻尼重塑方法，采取MRAC对双馈风力发电系统传动链宽频受迫扭振抑制效果提升了21.77%，柔性传动轴扭矩和发电机输出有功功率波动均减小。

In turbulent wind excitation scenarios, the shaft system drive chain of the doubly-fed wind power generation system exhibits wideband forced torsional vibration in the low-frequency range, which affects the stable operation of the turbine. A Model Reference Adaptive Control (MRAC) method for torsional vibration suppression is proposed. A wideband forced torsional vibration model of the shaft system considering optimal torque control and bandpass filter parameters is established. The feedforward controller and adaptive control law are designed based on the system input and output to address the challenge of difficult measurement of transmission chain state variables. The adaptive adjustment of the main parameters of the bandpass filter with active damping provided to the transmission chain of the doubly-fed wind power generation system allows the dynamic response of the transmission chain to track the stable reference model. Taking a 1.5MW doubly-fed wind power generation system as an example, the tracking effect of MRAC is simulated and verified under sustained turbulent wind excitation scenarios. The suppression effect of wideband forced torsional vibration is compared between the electrical damping reshaping method and the MRAC method. The results show that the proposed MRAC method can achieve stable tracking of the controlled object with a tracking average error not exceeding 4.94%. Compared to the electrical damping reshaping method, adopting MRAC in the doubly-fed wind power generation system improves the suppression effect of wideband forced torsional vibration by 21.77%. The fluctuations in flexible transmission shaft torque and generator active power output are both reduced.

国家自然科学基金资助项目(61963024)