Research on MPC-based Suspension Control of Wind Maglev Yaw System

The yaw system is one of the important parts of the horizontal axis wind turbines. In this paper, a suspension control method based on model predictive control (MPC) together with PID is proposed to realize the stable suspension control of the novel maglev yaw system (MYS) at the equilibrium point. First, the mathematical model of the MYS is derived according to the basic theory of electro- magnetism and dynamics, and then the state space equation of the MYS is established by linearizing the above mathematical model at the equilibrium point. Second, the MPC controller as outer loop controller and PID controller as inner loop controller based on the state space equation are designed. Finally, a series of simulations are carried out, the influence of the controllers' design on the output current and the air gap is analyzed; and the control effects via the classical PID control and the proposed NIPC together with PID are compared. The simulation results show that the proposed method has a better control effect on the MYS.