Abstract
Modular multilevel converters (MMCs) have a promising application in passive network supply, such as offshore platforms and remote loads. In these applications, load imbalance is inevitable, and the maximum-allowable voltage ripples and peak arm currents define the operating limits of modular multilevel converters. This paper investigates the impact of circulating current control supplying passive networks in capacitor voltage ripples of sub-modules and peak arm currents under unbalanced load conditions, comparing the effects of three circulating current control methods on internal variables of the MMCs. The efficacy of the circulating current control is validated through real-time digital simulations of an 400 MVA benchmark MMC-based HVDC transmission system.
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