Asymmetric Trapezoidal Wave (ATW) Modulation Scheme for Modular Multilevel Resonant DC/DC Converter

The modular multilevel resonant dc/dc converter (MMRDC) is suitable for interconnection between medium-voltage dc grids and low-voltage dc grids because of its high power and high voltage handling capability. However, the current stress of MMRDC with the conventional quasi-square-wave modulation sch...

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Bibliographic Details
Published in2023 IEEE 6th International Electrical and Energy Conference (CIEEC) pp. 2445 - 2449
Main Authors Xu, Yutao, Tan, Zhukui, Chen, Dunhui, Feng, Qihui, Zhang, Houyi, Gao, Shilong
Format Conference Proceeding
LanguageEnglish
Published IEEE 12.05.2023
Subjects
DC/DC converter
Mathematical models
Medium voltage
modular multilevel converter (MMC)
Modulation
Multilevel converters
resonant converter
Simulation
Soft switching
Voltage
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Summary:The modular multilevel resonant dc/dc converter (MMRDC) is suitable for interconnection between medium-voltage dc grids and low-voltage dc grids because of its high power and high voltage handling capability. However, the current stress of MMRDC with the conventional quasi-square-wave modulation scheme is high when in light load conditions. To address this problem, a novel asymmetric trapezoidal wave (ATW) modulation scheme is proposed in this paper, which separately modulates the duty cycles of string output voltage rising and fall processes. The time-domain mathematical model of MMRDC with the ATW modulation scheme is established. Then, the soft switching and current stress characteristics are analyzed. Finally, the simulation results verify the validity of the analysis.
DOI:10.1109/CIEEC58067.2023.10165999