3.8 Proceedings Paper

Asymmetrical DC-DC Modular Multilevel Converter using Switching Cycle Control

Publisher

IEEE
DOI: 10.1109/COMPEL53829.2022.9830011

Keywords

Modular Multilevel Converter; DC-DC power converters; Power-density; Multilevel converters

Funding

  1. Advanced Research Projects Agency-Energy (ARPA-e) from the Department of Energy (DOE) [DEAR0000892]
  2. Wide Bandgap High Power Converters and Systems (WBG-HPCS) consortium of Center for Power Electronics Systems (CPES)

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This paper introduces the advantages and limitations of Modular Multilevel Converters in DC-DC operation, and proposes two control techniques based on switching-cycle-balancing control (SCC). Research shows that there is still room for improvement in SCC, especially when the input/output voltage ratio of the converter is pre-determined.
Modular Multilevel Converters (MMC) have emerged as an excellent option for medium/high voltage DC-AC or AC-DC applications due to their unmatched modularity and scalability. Despite this, the DC-DC operation of MMC isn't very well studied. Even when DC-DC MMC operation is achieved, the submodule capacitor sizing challenge is enormous. Recently proposed switching-cycle-balancing control (SCC) solves this challenge of high submodule capacitance by balancing the submodule capacitor voltages every switching cycle instead of line cycle. Balancing within a switching cycle essentially decouples the MMC operation from line frequency, providing opportunity for a fundamentally new DC-DC converter. Despite its advantages for DC-DC operation, SCC has scope for improvement, especially if converter operating input/output voltage ratio is pre-determined. This paper develops a fundamentally new MMC topology for DC-DC operation while also proposing two SCC-derived control techniques. The advantages and limitations of the two control techniques are discussed extensively and compared to conventional SCC DC-DC operation. The analysis is verified using simulations and representative converter behavior is verified using 6kV test-bench utilising 10kV SiC MOSFETs.

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