The Control Research Based on Predictive Current Controlled PMSM Drive

In view of the MMC (modular multilevel converter) driven PMSM (permanent magnet synchronous motor) control system, the predictive current control algorithm has the characteristics of precise current tracking, smaller current distortion, etc., and it is suitable for digital implementation. However, due to the fact that the PMSM system is a nonlinear time-varying system, the strategy usually subjected to disturbances, such as unknown load torque and time-varying parameters. To ensure robustness against these perturbations, this paper analyses the stability of the model-based approach by Z domain analysis method, a novel scheme based on error feedback predictive controller is designed, then the overall closed-loop system is proved to be globally asymptotically stable depending on the design parameters. Simulation and experimental results are present to verify the effectives of the new strategy..