Analysis of the three-level diode-clamped split-source inverter

This paper studies the integration of the two-level split-source inverter (SSI) concept into the three-level diode-clamped inverter configuration. The proposed three-level diode-clamped-based SSI (3L-DC-SSI) uses two isolated dc sources, two inductors, two capacitors, and six input diodes with the three-level diode-clamped bridge. This topology introduces lower current stresses of the switches compared to the three-level flying capacitors-based SSI (3L-FC-SSI). Moreover, the 3L-DC-SSI has the ability to be operated from two unequal isolated dc sources, where its modulation and mathematical derivation in this case is discussed as well. On the other hand, this topology has some limitations in terms of the higher voltage stresses and the low frequency component in the input current and the inverter voltage. The 3L-DC-SSI is analyzed in this paper using the standard space vector modulation scheme, where simulation results of a 30 kVA system are introduced.