A component-minimized dual-output multilevel converter and its applications

In this paper, a component-minimized dual-output multilevel converter is proposed. The operating principle and constraints on voltage and frequency of the dual outputs are detailed. Three applications of the proposed converter are explained: a) online uninterruptible power supplies (UPSs), b) six-phase wind generators, and c) doubly fed induction generator (DFIG) wind power systems. Also, limits on the modulation index in each application are analyzed. Furthermore, the loss breakdown of the online UPS system is analyzed and compared with a conventional back-to-back converter. The simulation results are included in the summary to verify the validity of the proposed topology.