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The modular multilevel converter (MMC), is widely adopted in high voltage applications because of its simplicity and modularity. However, the current and power flow is very complicated. As a result, methods proposed for capacitor reduction, which is required to stored line frequency related circulating energy, all went through complicated mathematical derivation. C. Li proposed a state plane analysis...
Recently, dc-dc modular multilevel converter (MMC) with medium or high frequency transformer has attracted more and more attentions for its many advantages such as flexible dc power flow control, good voltage matching and inherent dc current limitation. So far, the arm-voltage of dc-dc MMC has been modulated in many forms such as sinusoidal, trapezoid or even rectangular to gain different benefits...
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