Development of Simple and Robust Weighting-Factor-Less Predictive Torque Control for Enhanced Open Winding Permanent Magnet Synchronous Motor Drive Operation

Intuitive response and multi-objective control are well-known features of Finite Control Set Predictive Torque Control (FCSPTC). However, its implementation difficulty is a result of limitations such as high computations, strong model parameter dependency in control, and time-consuming tuning efforts for weighting factors in a cost function. Particularly, when FCSPTC is applied to a Multi-Level Inverter (MLI)-supplied motor drive, computation complexity is predominant. The proposed research work in this paper offers a new FCSPTC to dual two-level VSIs supplied for an Open Winding Permanent Magnet Synchronous Motor (OWPMSM) drive. The contributions of the proposed FCSPTC for the OWPMSM drive are the following. (i) Simplicity: There are fewer operational steps in control and limited evaluations with five prediction voltage vectors (VVs) out of 19, and a flux weighting-factor-less design is used by adopting a voltage cost function. (ii) Robustness: There is less parameter dependency in control through the involvement of stator resistance only. (iii) Switching frequency reduction: The application of an optimal switching state from the redundant switching states of optimal VVs is used to generate fewer switching state transitions, where the process is independent from the switching frequency weighting factor. According to theoretical and experimental findings, it is evident that the proposed FCSPTC technique operates effectively without the weighting factor and provides the above-stated features, resulting in an optimal response in flux, torque and current, switching frequency reduction, and low-complexity operation. The proficiency of the proposed FCSPTC technique is experimentally verified by comparing it with existing control schemes.