Journal
IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS
Volume 9, Issue 3, Pages 3407-3435Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JESTPE.2020.2990689
Keywords
Capacitors; Topology; Harmonic analysis; Fault currents; Multilevel converters; Power conversion; Voltage control; DC ice melting; dc-side faults; medium-voltage motor drive (MVMD); MMC-BESS; modular multilevel converter-based high-voltage direct current (MMC-HVDC); MMC-SST; submodule (SM) capacitor voltage ripple; traction systems
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Funding
- National Natural Science Foundation of China [51777125]
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MMC is a promising topology for medium- and high-power conversion systems, offering modularity and exceptional features. Challenges such as SM capacitor voltage balancing and output current control have been addressed by recent research on SM structures.
Modular multilevel converter (MMC) is a promising topology for medium- and high-power conversion systems. In recent years, it has been prominent over other power converters because of its exceptional features, including modularity and flexibility to adapt any voltage level, remarkable harmonic performance, no dc-link capacitors, transformerless operation, absence of ac-side filters, and capacitive nature of phase legs. However, there are some challenges, for instance, submodule (SM) capacitor voltage balancing, output current control, circulating current control, minimization of SM capacitor voltage ripple, dc-side faults, and efficient SM topologies that have been addressed by the research studies over time. In this article, we focus on the recent advancements in SM structures and their capability to overcome the faults, reduction in switching losses, decrease in voltage sensor count, and minimization of SM capacitor voltage ripple and provide the quick restoration of SM capacitor voltages after the removal of faults. Finally, the applications and development prospects of MMC are discussed in detail.
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