A Steady-State Analysis Method for a Modular Multilevel Converter

By Qiang Song, Wenhua Liu, Xiaoqian Li, Hong Rao, Shukai Xu, Licheng Li. IEEE transactions on power electronics, 2013

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Isolated DC/DC Structure Based on Modular Multilevel Converter (2015, methodology): “The modular multilevel converter (MMC) [20] is normally used as an interface between the ac grid and an HVDC line, often in a setup where two MMCs are connected at their dc terminal over an HVDC transmission line [21], [22], as illustrated in Fig.”
Harmonic Instability in MMC-HVDC Converters Resulting From Internal Dynamics (2016, methodology): “The circulating second harmonic current can be suppressed either by a controller [5] or by a hardware filter [2] (Fig.”
Analysis of Resonance Between a VSC-HVDC Converter and the AC Grid (2018, background): “The voltage source converter (VSC) based HVDC (VSC-HVDC) has recently attracted attention of researchers and been branded a highly available technology [1]–[5] in engineering field with numerous VSC-HVDC projects being planned or constructed worldwide.”
Characteristic Investigation and Control of a Modular Multilevel Converter-Based HVDC System Under Single-Line-to-Ground Fault Conditions (2015, background): “According to [27], udiff mainly consists of a negative-sequence double-line frequency component.”