Minimising power losses and torque ripples of permanent-magnet synchronous motor by parallel execution of a two-stage predictive control system

• Published in: IET power electronics Vol. 13; no. 16; pp. 3590 - 3600
• Main Authors: Vafaie, Mohammad Hossein, Mirzaeian Dehkordi, Behzad
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 16.12.2020
• Subjects: cascade predictive controllers; deadbeat control; electric current control; iterative methods; machine control; minimum torque ripple; optimal stator‐flux linkage vector; permanent‐magnet synchronous motor; predictive control; predictive direct torque controller; Research Article; stator‐flux linkage components; stator‐voltage vector; synchronous motor drives; synchronous motors; torque control; torque ripple; two‐stage predictive control system; stator-flux linkage components; machine control; iterative methods; cascade predictive controllers; deadbeat control; torque control; electric current control; synchronous motors; stator-voltage vector; permanent-magnet synchronous motor; optimal stator-flux linkage vector; minimum torque ripple; torque ripple; two-stage predictive control system; predictive direct torque controller; synchronous motor drives; predictive control
• ISSN: 1755-4535; 1755-4543
• DOI: 10.1049/iet-pel.2020.0583

In this study, an advanced predictive control system is proposed which consists of two cascade predictive controllers; the first one minimises the power losses while the second one minimises the torque ripple. In the first controller, motor losses are formulated as a function of stator-flux linkage components. Then, the optimal stator-flux linkage vector which causes the minimum losses is found by adopting fast-iterative shrinkage thresholding algorithm (FISTA). The second controller is a predictive direct torque controller adopted to control the stator-flux linkage and torque directly. In this controller, torque ripple is formulated as a function of the stator-voltage vector. Then, the optimal voltage vector which causes the minimum torque ripple is found by adopting FISTA. In the second controller, deadbeat control of the stator-flux linkage is considered as a constraint in minimisation of torque ripple. To assess the effectiveness of the proposed control system, performance of the motor is assessed through various experimental tests, where the results confirm that the proposed control system minimises the power losses and torque ripple, simultaneously. The comparative assessment with the recent predictive controllers indicates that the proposed control system has higher efficiency as well as lower torque ripples in all operating points.