Novel dual three-phase multilevel SVM for six-phase multilevel inverters to drive six-phase induction machine

Abstract

This paper proposes a novel dual three phase SVM for six phase multilevel inverter to control a Six Phase Induction Machine (SPIM). The main idea is to control the six-phase multilevel inverter as two three-phase multilevel inverter separately by Space Vector Modulation of the N-level three-phase Separate DC Source (SDCS) inverter. This enables a great simplification of the algorithm control for six phase multilevel (N level) inverter drive. In six phase SVM, N6 vectors (N=2 two level, 3 level or 4 level, implies 64 vectors, 729 vectors, 15625 vectors respectively) were used. However, in a proposed dual three phase SVM, we use N3 vectors (N=2 level, 3 level or 4 level implies 8 vectors, 27 vectors, 125 vectors respectively) to control the six-phase multilevel inverters as two three-phase multilevel inverter with the same three-phase multilevel SVM. Whereas the first three-phase inverter is composed by 1, 3, and 5 phases and the second three-phase is composed by 2, 4 and 6 phases. The simulation results of the Indirect Field Oriented Control (IFOC) of six-phase induction machine drive fed by stacked multilevel inverters are given to highlight the performance of the proposed dual three phase SVM. Moreover, used multilevel topologies reduce the currents THD distortion as well as the total semiconductor losses.