Fault-tolerant predictive current control with two-vector modulation for six-phase permanent magnet synchronous machine drives

Abstract

Multiphase machines and drives are attractive to researchers due to the capability of fault tolerance. Finite-control-set model predictive control (FCS-MPC) has been introduced to the post-fault operation of multiphase drives and is superior with rapid dynamic response. However, conventional FCS-MPC is always troubled with low switching frequency and the consequent current ripples. This study proposes a fault-tolerant two-vector predictive control (FT-TVPC) that utilises a zero voltage vector to modulate with the active vector in each sampling period. The post-fault model of the machine and the drive is obtained in original phase frame with the purpose of achieving various control modes with different reference currents. A group of experiments are carried out and proves the effectiveness of the proposed control technique on improving the current quality. The average switching frequency of the inverter increases in exchange. The results also demonstrate that different control modes have little influence but working conditions have a great impact on the improvement of performance.