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
Original language | English |
---|---|
Journal | Engineering Science and Technology, an International Journal |
Volume | 19 |
Issue number | 1 |
Pages (from-to) | 31-39 |
Number of pages | 9 |
DOIs | |
Publication status | Published - Mar 2016 |
Keywords
- Dual three-phase motor
- Multilevel inverter
- Multi-phase motor drive
- Open-end winding
- Post-fault tolerance
- Multilevel PWM
- Level-shifted PWM