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Research Article Open Access
This paper presents a new control technique to regulate the capacitor voltage in cascaded multilevel inverters. Without requiring transformers, the scheme proposed here allows the use of a single dc power source with the remaining n − 1 dc sources being capacitors. This paper focuses mainly to achieve an effective capacitor voltage regulation with the Phase shift modulation and energy storage using Ultra-capacitors as they have higher power density, higher efficiency, longer life and greater cycling capability in cascaded multilevel inverters. It shows hope to reduce the voltage ripple of the capacitors, which leads to higher power conversion efficiency with equal power distribution, reduces the initial cost, and complexity hence it is apt for industrial applications. In this paper a 5-level cascaded multilevel inverter with induction motor drive is considered. Finally, the simulation results validate the concept of this topology.