Ramachandra Sekhar - Department of Electrical Engineering Indian Institute of Technology Hyderabad Hyderabad, Andhra Pradesh, India
Srinivas - Department of Electrical Engineering Indian Institute of Technology Madras Chennai, Tamilnadu, India

This paper investigates the SVPWM switching scheme for the dual two-level inverter for generating three-level space vector. The decoupled SVPWM is employed for the dual-inverter scheme in order to realize the reference voltage vector. This paper identifies the error voltage vectors in the dual-inverter scheme by identifying the error voltage vectors of the individual two-level inverters. This paper presents the analytical expression for the rms ripple current in the dualinverter scheme. The current trajectory is theoretically estimated indirectly using the error voltage vectors in the dual-inverter scheme. The performance is studied analytically and compared with the simulations carried out using Matlab/SIMULINK and finally cross-verified by performing suitable experiments on a 1 kW open-end winding induction motor drive.

Dual-inverter, current ripple, current trajectiry, open-end winding induction motor