Two-quadrant clamping inverter scheme for three-level open-end winding induction motor drive

This article proposes a space-vector based pulse width modulation (SVPWM) scheme for a three-level dual-inverter-fed open-end winding induction motor drive. The proposed method introduces clamping of one inverter for 180° span of the rotation of the reference space vector. The proposed scheme neither requires sector identification nor lookup tables for the generation of the gating pulses. The switching pattern adopted in the present work ensures alternative clamping and switching modes every 180° for both the inverters. In the present scheme, the zero sequence currents are denied a path by using isolated power supplies. The proposed switching strategy envisages two-quadrant clamping of the inverters which results in lowering of the losses that occur in power electronic switches. Simulation studies have been carried out for the proposed SVPWM strategy using MATLAB/Simulink.