关键词: 风电机组, 独立变桨控制, 模型预测控制, 坐标变换, 载荷控制

Abstract: Aiming at the problem of unbalanced load borne by large-scale wind turbines during constant speed operation, a model predictive control （MPC） individual pitch control strategy for wind turbines with multiple inputs and multiple outputs is proposed. First, establish the state space model of the wind turbine in the rotating coordinate system, and obtain the average period model in the fixed coordinate system through coordinate transformation. The analysis result shows that the model has a non-diagonal coupling that cannot be ignored; Then calculate the required observer and controller parameters, and further design the multi-input and multi-output model prediction individual pitch controller based on the Kalman state observer. The input and multi-output model predicts the individual pitch controller; Finally, the load characteristics and operating characteristics of the NREL 5 MW wind turbine platform under the action of turbulent wind are analyzed for the centralized pitch, the traditional individual pitch, and the model-predicted individual pitch control strategy. The results show that compared with the traditional PI individual pitch control, the MIMO model predictive individual pitch controller has a better load reduction effect without causing power fluctuations.

Key words: wind turbines, individual pitch control, model predictive control, coordinate transformation, load mitigation