TY - JOUR
T1 - Analysis and implementation of power managment and control strategy for six-phase multilevel ac drive system in fault condition
AU - Sanjeevikumar, P.
AU - Grandi, Gabriele
AU - Blaabjerg, Frede
AU - Wheeler, Patrick William
AU - Olorunfemi Ojo, Joseph
PY - 2016/3
Y1 - 2016/3
N2 - 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
AB - 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
KW - Dual three-phase motor
KW - Multilevel inverter
KW - Multi-phase motor drive
KW - Open-end winding
KW - Post-fault tolerance
KW - Multilevel PWM
KW - Level-shifted PWM
U2 - 10.1016/j.jestch.2015.07.007
DO - 10.1016/j.jestch.2015.07.007
M3 - Journal article
SN - 2215-0986
VL - 19
SP - 31
EP - 39
JO - Engineering Science and Technology, an International Journal
JF - Engineering Science and Technology, an International Journal
IS - 1
ER -