Robustness analysis of deadbeat-direct toque and flux control for IPMSM drives

This paper presents robustness evaluation of deadbeat-direct torque and flux control (DB-DTFC) of IPMSM drives with respect to machine parameter variation. For performance comparison, current vector control (CVC), one of the most widely used control methods, is also implemented under identical operating conditions as DB-DTFC. As the metrics to evaluate dynamic performance of DB-DTFC and CVC IPMSM drives, command tracking is used to investigate torque command tracking performance and dynamics stiffness is used to evaluate disturbance rejection performance. In addition, the torque estimation accuracy of DB-DTFC and CVC is investigated with respect to parameter variation. Simulation and experimental results of robustness evaluation of DB-DTFC and CVC are presented in this paper. Furthermore, the dynamic robustness of DB-DTFC and CVC drives are evaluated via eigenvalue (EV) migration. Since an IPMSM drive is a nonlinear system, an operating point model of an IPMSM drive is derived for linear analysis of EV migration. Finally, the US06 Supplemental Federal Test Procedure (SFTP) automotive driving cycle is applied to investigate the EV migration of a test IPMSM drive over a wide operating space.