This article investigates an observer-based optimal direct torque control (DTC) strategy for
improving the transient and steady-state performance of surface-mounted permanent
magnet synchronous motor (SPMSM) drives. Unlike conventional DTC techniques, the
proposed method simultaneously controls speed, torque, and flux variables by employing
the optimal control theory in the stationary reference frame. This helps achieving a simple
structure along with good low-speed operation as the stator flux angle need not be …

This paper proposes a predictive direct torque control (PDTC) technique for surface-
mounted permanent-magnet synchronous generators (PMSGs) in variable-speed wind
turbine applications. A discrete-time model to predict the future performance of the PMSG is
developed and a cost function to selected the optimal switching state from a finite number of
states is formulated. The control variables are the torque and d-axis current of the PMSG.
Therefore, the proposed PDTC is simple in comparison with the conventional PDTC where …