A Model-Free Predictive Current Control-Based Fault-Tolerant Scheme for Dual Three-Phase PMSM Drives With Minimized Copper Loss

This paper presents a model-free predictive current control (MFPCC) strategy for dual three-phase permanent magnet synchronous motor (DTP-PMSM) drives that specifically aims to minimize copper losses during open-circuit faults through an optimized fault-tolerant control framework. For isolated-neutral-point configurations, the method derives optimal current references without low-order harmonic components, avoiding the need for model order reduction while preserving standard decoupling transformations. The integration of MFPPC with vector space decomposition (VSD) and dual space vector pulse width modulation (SVPWM) ensures precise current tracking in both normal and fault-tolerant operations, achieving enhanced parameter robustness by completely eliminating parameter uncertainty effects. Although conventional strategies impose sinusoidal currents to maintain torque, this constraint is suboptimal for copper loss minimization. This paper presents a theoretically-derived current reference formulation that achieves fundamental copper loss reduction for open-circuit fault conditions in DTP-PMSM drives systems. Through rigorous analytical derivation and experimental validation, the proposed fault-tolerant control scheme demonstrates superior performance compared to existing solutions for both phase-loss and open-switch faults in two-level voltage source inverter-fed DTP-PMSM drive systems, achieving significantly reduced copper losses while maintaining operational stability.