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.

Multi‐channel VSI fed large variable speed asynchronous hydro‐condenser: fault analysis, fault diagnosis and fault tolerant control

“…Fault detection based on current distortion approach was discussed in [25,26] which requires high computational efforts. Fault tolerant control for the various electric drives was discussed in [28][29][30][31][32][33], where [31] reviewed fault-tolerant and reconfiguration techniques in power converter fed electric drives. Further, back-to-back power converter redundancy issues in large rated HVDC stations were reported in [34].…”

A Parallel Estimation System of Stator Resistance and Rotor Speed for Active Disturbance Rejection Control of Six-Phase Induction Motor

“…The 6PIM is successfully used in special applications, such as electric ships, electric aircrafts, electric vehicles, and melt pumps, where the high reliability and continuity of the operation are critical factors for the system [4]. The phase redundancy of the 6PIM provides the ability of the open-phase fault-tolerant operation without any extra electronic components [5,6].…”

Control strategies for non‐sinusoidal multiphase PMSM drives in faulty modes under constraints on copper losses and peak phase voltage

“…Although considering constraints on current and voltage, strategies in [28,29] apply online computations of current reference generation, which can be a big challenge in the real-time systems with a higher number of phases. As [29], another study using model predictive control is presented in [30] for 6-phase PMSM drives with sinusoidal back-EMFs and currents. In [30], the total copper losses of all healthy phases are optimised, resulting in the overrated RMS current problem as in [25][26][27].…”

“…As [29], another study using model predictive control is presented in [30] for 6-phase PMSM drives with sinusoidal back-EMFs and currents. In [30], the total copper losses of all healthy phases are optimised, resulting in the overrated RMS current problem as in [25][26][27]. In [31], the control strategies have been presented and validated by numerical results for a trapezoidal back-EMF 7-phase PM machine with two identical rotors.…”