Predictive control for permanent magnet synchronous machine based on automatic differentiation method

In order to solve such problem as sensitivity to the load torque variations of traditional PI speed controller for permanent magnetism synchronous machine (PMSM), and to reduce the overshoot of system speed, a nonlinear predictive controller design for PMSM speed control system is proposed in this paper. For the problem that a Taylor series is not easy to obtain in nonlinear predictive control, the nonlinear predictive control based on automatic differentiation makes the process of solving Taylor series problem simple. On the basis of analysis, the Taylor series expansion of the mathematical model of PMSM based on automatic differentiation method is derived. The simulation results demonstrate that the nonlinear predictive control strategy makes system speed less overshoot, show robustness to load torque disturbance.