Dynamic Modeling of Modular Multilevel DC/DC Converters for HVDC Systems
Published in In the proceedings of 2014 IEEE 15th Workshop on Control and Modeling for Power Electronics (COMPEL), 2014
Recommended citation: Gregory Kish, Connor Holmes, Peter Lehn, "Dynamic Modeling of Modular Multilevel DC/DC Converters for HVDC Systems." In the proceedings of 2014 IEEE 15th Workshop on Control and Modeling for Power Electronics (COMPEL), 2014.
Abstract: This paper presents the first dynamic model of the DC-MMC, a new class of modular multilevel single-stage dc/dc converters aptly suited for HVDC systems. A state-space model for a single string of the DC-MMC is developed and validated by comparing with time-domain simulation results from a comprehensive switched converter model. The developed averaged model is utilized to investigate submodule capacitor voltage balancing characteristics of the DC-MMC. In particular it is demonstrated that, unlike the dc/ac modular multilevel converter, direct ac modulation of the DC-MMC is not sufficient to keep capacitor voltages balanced. The developed model is also used to propose and validate a supplemental controller that suppresses unwanted second and third harmonic circulating ac currents within the DC-MMC.
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