针对风机疲劳载荷抑制的频率响应控制研究OA

With the increasing penetration of wind power,utilising wind turbines for grid frequency response has become a critical approach to maintaining system stability.However,frequent power adjustments exacerbate mechanical vibrations in the drivetrain and tower,leading to the accumulation of fatigue loads and shortening the service life of the units.To address this issue,this paper proposes a coordinated control strategy that balances frequency support capability with fatigue load mitigation.Firstly,a mathematical model incorporating two-mass drivetrain and tower dynamics is established based on a 5 MW wind turbine.Small-signal analysis is employed to linearize and discretize the model,upon which a multi-objective Model Predictive Control(MPC)algorithm is designed.Simulation results demonstrate that,compared with traditional control methods,the proposed strategy effectively mitigates fluctuations in mechanical torque and tower thrust under turbulent wind conditions.Rainflow counting analysis confirms that the proposed method significantly reduces the number of high-amplitude low-frequency stress cycles.Consequently,the equivalent fatigue loads on the tower and main shaft are reduced by approximately 15%and 20%,respectively,effectively achieving a balance between grid frequency regulation requirements and wind turbine fatigue load mitigation.