Fault-Tolerant Control Method for Five-Phase PMSM with High Control Performance and Low Computational Burden

In this paper, a fault-tolerant finite control set model predictive current control (FCS-MPCC) method based on the extended voltage vector and adaptive control set (FCS-MPCC-EACS) is proposed, which improves the fault-tolerant control accuracy and stability of five-phase permanent magnet synchronous motor (F-PMSM) under two-phase open-circuit fault (OCF), and reduces the computational burden. Firstly, the extended voltage vector is proposed, and the optimal voltage vector and duty ratio are calculated by optimizing the cost function, thereby improving the fault-tolerant control accuracy and stability of the F-PMSM. Then, the deadbeat (DB) method is utilized to calculate the reference voltage vector for constructing the adaptive control set, which replaces the complete voltage vector enumeration process, thereby reducing the computational burden. Simulation test results show that compared with the FCS-MPCC method, FCS-MPCC with the extended voltage vector control set (FCS-MPCC-ECS) and FCS-MPCC-EACS methods improve the speed fault-tolerant control accuracy under non-adjacent two-phase OCF by 14.9% and 17.4%, respectively. At the same time, compared with the FCS-MPCC-ECS method, the calculation time of the FCS-MPCC-EACS method is shortened by 83.2%.