Modeling and circulating current control of MMC

Modular Multilevel Converters (MMC) offer several advantages over common three level inverters. For example, MMCs have lower switching frequency and lower dv=dt due to their multilevel output. For this reason, MMCs are typically used in High Voltage DC (HVDC) applications. In this paper, different approaches for (real time) simulation of MMC based systems are presented. A Thevenin based approach with a constant admittance matrix is proposed to lower the complexity and computation time. In addition, a circulating current suppression controller is formulated based on time domain analysis and validated through simulations.

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