Abstract
The multiphase multilevel motor drives are a promising solution for some high-power and high-reliability applications, since they have multiple power conversion routes, a large amount of redundant voltage vectors, higher equivalent switching frequencies and superior harmonic performance. It has great significance to exploit their remedial control strategies in depth to fully utilize their high fault tolerant capabilities. This paper will present an updated technical review of fault tolerant control schemes for multiphase multilevel motor drives. Based on exemplification of the diode neutral-pointclamping three-level (DNPC-3L) inverters and T-type NPC three-level (TNPC-3L) inverters fed asymmetric six-phase PMSM drives, the study is taken for both phase-leg faults and switch faults. Furthermore, the discussion on multiple-switch faults, short-circuit switch faults and switch and leg hybrid faulty conditions are discussed in this paper.
Highlights
With increasing demands of high reliability and large capacity for electric drive systems, multiphase drives have been widely applied in various fields such as elevators, aircrafts, electric vehicles, ship propulsion, etc[1]
Most of fault tolerant control schemes are focused on openphase faults in drives since redundant phases are available for multiphase drives
When multiple switches fall in open-circuit faults, more voltage vectors will be lost in multiphase multilevel motor drives, which brings more challenges in reconstructing symmetrical voltage trajectories and controlling mid-point voltage in DC link
Summary
With increasing demands of high reliability and large capacity for electric drive systems, multiphase drives have been widely applied in various fields such as elevators, aircrafts, electric vehicles, ship propulsion, etc[1]. The fault tolerant control schemes have been studied intensively for both multiphase drives and multilevel inverters. The multilevel inverters have redundant voltage vectors because of more power switches in one phase leg. Almost all research work on fault tolerant control of multilevel inverters have been taken on three-phase systems. With increasing requirements of highpower high-reliability application, the multiphase multilevel motor drives become a promising solution, which offer advantages of high output power ability, good harmonics and torque performance, and high fault tolerant capability.
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