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Analysis and implementation of power management and control strategy for six-phase multilevel ac drive system in fault condition

Padmanaban, Sanjeevikumar; Grandi, Gabriele; Blaabjerg, Frede; Wheeler, Patrick; Ojo, Joseph Olorunfemi

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Authors

Sanjeevikumar Padmanaban

Gabriele Grandi

Frede Blaabjerg

Joseph Olorunfemi Ojo



Abstract

This research article exploits the power management algorithm in post-fault conditions for a six-phase (quad) multilevel inverter. The drive circuit consists of four 2-level, three-phase voltage source inverter (VSI) supplying a six-phase open-end windings motor or/impedance load, with circumstantial failure of one VSI investigated. A simplified level-shifted pulse-width modulation (PWM) algorithm is developed to modulate each couple of three-phase VSI as 3-level output voltage generators in normal operation. The total power of the whole ac drive is shared equally among the four isolated DC sources. The developed post-fault algorithm is applied when there is a fault by one VSI and the load is fed from the remaining three healthy VSIs. In faulty conditions the multilevel outputs are reduced from 3-level to 2-level, but still the system propagates with degraded power. Numerical simulation modelling and experimental tests have been carried out with proposed post-fault control algorithm with three-phase open-end (asymmetrical induction motor/R-L impedance) load. A complete set of simulation and experimental results provided in this paper shows close agreement with the developed theoretical background.

Citation

Padmanaban, S., Grandi, G., Blaabjerg, F., Wheeler, P., & Ojo, J. O. (2016). Analysis and implementation of power management and control strategy for six-phase multilevel ac drive system in fault condition. Engineering Science and Technology, an International Journal, 19(1), https://doi.org/10.1016/j.jestch.2015.07.007

Journal Article Type Article
Acceptance Date Jul 13, 2015
Online Publication Date Aug 7, 2015
Publication Date Mar 1, 2016
Deposit Date May 11, 2017
Publicly Available Date May 11, 2017
Journal Engineering Science and Technology, an International Journal
Electronic ISSN 2215-0986
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 19
Issue 1
DOI https://doi.org/10.1016/j.jestch.2015.07.007
Keywords Dual three-phase motor; Multilevel inverter; Multi-phase motor drive; Open-end winding; Post-fault tolerance; Multilevel PWM; Level-shifted PWM
Public URL https://nottingham-repository.worktribe.com/output/977980
Publisher URL http://www.sciencedirect.com/science/article/pii/S2215098615001081
Contract Date May 11, 2017

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