Fault-Tolerant Predictive Control for Five-Leg Dual-Mover Permanent-Magnet Motor Drives
Wei Wang, Weijie Tian, Zhixiang Lu, Zheng Wang, Wei Hua, Ming Cheng
Abstract
In this article, a fault-tolerant predictive control (FTPC) is proposed for the post-fault operation of five-leg dual-mover primary permanent-magnet linear motor drives with open circuit fault. In the post-fault operation, one phase winding and one voltage-source-inverter (VSI) leg are lost. As a result, there are four VSI legs and five healthy phase windings from two movers. Especially, one VSI leg is shared by two movers. The objects of FTPC are to reduce the computation burden and improve the performances. First, a minimum copper loss principle is designed to distribute the reference current for two movers. Second, two global optimal mover voltage vectors (MVVs) for two movers are respectively determined by geometrical location. Third, the two global optimal MVVs are respectively modified as two local optimal MVVs, in which the influence of the common leg is considered. Finally, two synthesized voltage vectors are obtained to improve the steady-state performances. Meanwhile, 60% of the computation burden can be reduced by using FTPC. The effectiveness of the proposed FTPC have been verified by experimental results.