Provided is a method of monitoring the condition of energy storage device assemblies of a modular multi-level converter (MMC) that includes series-connected submodules having a full-bridge or half-bridge topology Whereby each submodule include an energy st...

Provided is a modular multilevel converter and a method for synchronizing outputs of sub-modules of the converter. The modular multilevel converter includes sub-modules connected in parallel, and each sub-module generates an output. The modular multilevel ...