Comparison of Quasi-Two-Level Operation of a Flying Capacitor Converter with Quasi-Two-Level Operation of a Modular Multilevel Converter

The new Quasi-Two-Level operating (Q2O) mode is intended to minimize the
passive components and preserve the advantages of the multilevel topology as far as possible. This novel
operation mode was investigated for the Modular Multilevel Converter (MMC) and Flying Capacitor
Converter (FCC). This paper briefly summarizes and compares the control, modulation and minimization
potential of the passive components of the Q2O – mode for these two topologies. Thereby, the different
topologies are introduced and compared also.