Predictive Error Model Based Enhanced Observer for PMSM Deadbeat Control Systems

To achieve high robustness and performance, this paper proposes an enhanced observer based on a predictive error model for deadbeat predictive current control method (DPCC-PEMO). Firstly, the mathematical model of permanent magnet synchronous motor (PMSM), deadbeat predictive current control (DPCC) method and disturbance analysis are presented. Secondly, to estimate the trend of current variation in advance under non-linear disturbance effect of model mismatch, the predictive error model is designed based on recursive least squares (RLS) algorithm. Furthermore, the enhanced observer combined with the predictive error model (PEMO) is proposed and its stability and high convergence are proved. Finally, utilizing the PEMO, the predictive current model is established and the proposed DPCC method is developed. The experimental results validate the strong robustness and excellent dynamic tracking performance of proposed method in PMSM systems.