2025 lEEE International Conference on Predictive Control of Electrical Drives and Power Electronics (PRECEDE 2025)

With increasing requirements of high power ratings and high reliability in electrified transportation and energy harvesting applications, multiple three-phase permanent-magnet drives, such as the dual three-phase permanent-magnet synchronous motor (DTP-PMSM) drives have attracted more attention in both academia and industry. With additional control dimensions, the DTP-PMSM can offer additional features of low torque ripples and high fault-tolerant capability. On the other hand, the carrier ratio, i.e., the ratio of switching frequency versus fundamental frequency, becomes low for high-power or high-operation-frequency motor drives. Such low-carrier-ratio operation brings challenges in large low-order harmonics, distinct control delay and coupling effects between d-axis and q-axis to control of DTP-PMSM, which suffers from much smaller inductances in harmonic subspace and more switching states.

For addressing the issues and improve the control performance of DTP-PMSM with low carrier ratios, this tutorial will investigate multiple advanced low-carrier-ratio modulation and control schemes for DTP-PMSM drives. The modulation schemes under investigation include multisampling space vector modulation (MS-SVM), selective harmonic elimination pulse width modulation (SHEPWM), and synchronous optimal pulse-width modulation (SOPWM), whereas the control schemes include complex vector-based deadbeat predictive control, model predictive control (MPC), and flux trajectory control-based model predictive pulse pattern control (MP3C). The theoretical principles and experimental results will be presented to compare the different control strategies for DTP-PMSM drives with low carrier ratios.