Development of a Novel Single-Source Three-Phase Step-Up Multilevel Inverter Topology

Abstract:
This paper presents a novel single-source, three-phase, step-up multilevel inverter (MLI) topology based on the switched-capacitor (SC) principle. The proposed T-type configuration achieves double voltage gain using a single DC source, eliminating the need for multiple isolated inputs or bulky magnetic components. An input inductor ensures the soft charging of capacitors, reducing current spikes. A levelshifted PWM strategy is employed using Phase Disposition (PD) and Phase Opposition Disposition (POD). Simulation results validate the topology, showing five-level line voltage and improved harmonic performance. The PD scheme reduces THD to 27.9%. The design is well-suited for renewable, EV, and grid-connected applications