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In this paper, modularity concept using standard three-leg converters is addressed. Three-phase cascade converters composed by standard three-leg converters are investigated. They are composed of three, nine, twenty-one or n three-leg converters. It permits to reduce levels of currents and voltages on switches compared to conventional three-phase module or cascaded H-bridge converter. Other advantages...
The DC-DC Modular Multilevel Converter (MMC), which has originated from the AC-DC MMC circuit topology, is an attractive converter topology for interconnection of medium/high-voltage DC grids. Proper operation of the DC-DC MMC necessitates injection of an AC circulating current to maintain its submodule (SM) capacitor voltages balanced. The AC circulating current, however, needs to be minimized for...
This paper presents a generalised control that can be applied to a class of modular multilevel converter topologies. The approach splits up into current control based on the state-space representation and branch energy balancing. For the branch energy balancing, an optimisation process leading to minimal additional current stress is presented. After describing the control approach independently from...
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