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

Joseph Olorunfemi Ojo¹  Gabriele Grandi²  Frede Blaabjerg³  Sanjeevikumar Padmanaban⁴  Patrick William Wheeler⁵ 

[1] Center for Energy System Research, Department of Electrical & Computer Engineering, Tennessee Technological University, Cookeville, Tennessee 38505, USA;Department of Electrical, Electronic, and Information Engineering, Alma Mater Studiorum, University of Bologna, 40136 Bologna, Italy;Department of Energy Technology, Aalborg University, Pontoppidanstraede 101, 9220 Aalborg, Denmark;Ohm Technologies, Research & Development, Chennai, Tamil Nadu 600122, India;Power Electronics, Machines and Control Group, Department of Electrical & Electronics Engineering, Nottingham University, Nottingham NG7 2RD, UK;

关键词: Dual three-phase motor;    Multilevel inverter;    Multi-phase motor drive;    Open-end winding;    Post-fault tolerance;    Multilevel PWM;    Level-shifted PWM;   

DOI  :  10.1016/j.jestch.2015.07.007

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown