Flexible synchronized control of dual inverter-fed traction drive during overmodulation

Analysis of operation of dual inverter-fed motor drive with synchronized pulsewidth modulation (PWM) in the zone of overmodulation has been performed. This drive topology, which is perspective for traction application, includes two insulated DC sources (with equal or different voltages), feeding two standard three-phase inverters, connected with an open-end winding induction motor. Algorithms of synchronized PWM provide in the zone of overmodulation both continuous synchronization of the phase voltage of the induction motor and required sharing of the output power between two DC sources. Simulation results are given for dual inverter-fed systems with continuous and discontinuous versions of synchronized PWM.