Impact of Postfault Flux Adaptation on Six-Phase Induction Motor Drives With Parallel Converters

Abstract

Abstract-The redundancy of multiphase drives provides an inherent fault-tolerant capability that is appreciated in applications with a complicated corrective maintenance or safety-critical requirements. Fault restrictions however force the system to be reconfigured to operate in a smooth and efficient manner. Previous works have been focused on the optimization of current waveforms to generate an undisturbed operation but still maintaining the pre-fault rated flux settings. This work shows that efficient controllers can improve the post-fault performance in six-phase induction machines supplied by parallelconnected converters if offline optimization is used to obtain a variable reference flux. Theoretical and experimental results confirm that the proposed flux adaptation method provides higher torque/power capability, lower degree of imbalance in the current sharing between windings and efficiency improvement.

An Open-phase Fault Detection Method for Six-phase Induction Motor Drives

“…The fault management in a drive can be classified in three stages: fault detection FD [13][14][15][16][17], fault isolation FI [18][19] and implementation of a fault tolerant control (FTC) [20][21][22][23][24][25]. The implementation of these three stages in the system is necessary to ensure a suitable operation and to protect the system in post-fault situation.…”

Analysis of the Power Quality in Six-phase Induction Motor Drives with Arbitrary Winding Spatial Shifting

“…Apart from the well-known fault tolerant capability [6][7][8][9][10], some other innovative uses of the additional degrees of freedom have appeared in recent times [11][12][13].…”

Unified Fault-tolerant Control Strategy with Torque Ripple Compensation for Five-phase Permanent Magnet Synchronous Motor Based on Normal Decoupling

“…Research on multiphase motors aims at improving the reliability, fault diagnosis, and fault-tolerant operation of specific targets. Keeping these applications in mind, several recent works have focused on the development of high-performance, fault-tolerant control schemes for induction machines (IMs) and permanent magnet synchronous machines (PMSMs) [4][5][6][7]. The diagnoses focus on rapidity and accuracy [8,9], and adoption of effective isolation measures, such that a corresponding fault-tolerant control scheme can be adopted.…”