Journal
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
Volume 68, Issue 9, Pages 7725-7735Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIE.2020.3013493
Keywords
Topology; Windings; Gold; Frequency modulation; Inductance; Legged locomotion; Density measurement; Medium voltage direct current (MVdc); modular multilevel converter (MMC); power electronics; solid-state transformer (SST)
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Funding
- National Natural Science Foundation of China [51777085]
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This article proposes a solid-state transformer (SST) topology based on a modular multilevel converter (MMC) for simplifying energy conversion process and increasing power density. The integration of medium frequency (MF) transformer and mixed-frequency modulation have been demonstrated through simulation and experiments to validate the effectiveness of the proposed topology.
This article proposes a solid-state transformer (SST) topology based on modular multilevel converter (MMC) with high integration structure. By integrating the medium frequency (MF) transformer into the MMC leg and applying the mixed-frequency modulation on the half-bridge submodules, the line frequency ac to MF-ac conversion is realized directly without intermediate dc link. The proposed SST simplifies the energy conversion process, reduces the total amount of active components and magnetic components, and thus, can increase the power density of the system and reduce the manufacturing cost. Operation principle and design considerations are given in this article. In addition, simulation and experimental results are demonstrated to verify the validation of the proposed topology.
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