Deadbeat Predictive Current Control-Based Fault-Tolerant Scheme for Dual Three-Phase PMSM Drives

In this article, a deadbeat predictive current control-based fault-tolerant scheme is proposed and developed for the dual three-phase permanent-magnet synchronous motor (PMSM) drives. For the open-phase fault of the dual three-phase PMSM, the current references are derived without low-order components for minimum stator copper loss. The utilization of the deadbeat predictive current control guarantees high-control bandwidth for the current references under fault-tolerant operation. Then, a fault-tolerant control scheme is proposed for the open-switch fault based on the hybrid current references, which can fully utilize the remaining one health switch in the faulty inverter leg and minimize the stator copper loss. The additional copper loss caused by the open-switch fault can be reduced by around half with the proposed fault-tolerant control compared to previous remedial strategies. Thus, the ultimate torque output under the open-switch fault can be increased by around 20%. The machine model, the space vector diagram, and the control structure of the motor systems remain unchanged with the proposed fault-tolerant control scheme. The validity of the proposed fault-tolerant control schemes is verified by experiments.