Power Electronics for Utility Interface
Technical Dialogue Session
Utility Interface II
modular multilevel converter, switched capacitor, capacitor voltage balancing
The modular multilevel converter (MMC) is a promising topology. However, the conventional MMC relies on large arm inductance, many voltage sensors, and complicated feedback control to maintain submodule (SM) capacitor voltages balanced. In contrast to the conventional one, the MMC based on switched-capacitor (SC) structure, named as SC-MMC, is focused. To unleash the automatic SM capacitor voltage balancing capability of the SC-MMC, a Y-matrix modulation (YMM) has been proposed. An unresolved issue of the YMM is that the existence of the full rank Y matrix has not been proved theoretically. In this digest, an analytical proof of the existence of the full rank Y matrix is provided. Simulation results are provided, and experimental verification will be presented in the final paper.