Submodule Switching-State Based EMI Modeling and Mixed-mode EMI Phenomenon in MMC

Modular Multi-level Converter (MMC) is widely used in high voltage occasions for its good power qualities and flexible controls. However, the large number of semiconductor switches would lead to an extremely complicated electromagnetic environment. To clarify the detailed conducted electromagnetic i...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2023-02, Vol.38 (2), p.1-13
Main Authors: Sun, Tao, Pei, Xuejun, Shan, Yue, Pei, Jianguo, Jiang, Dong
Format: Article
Language:English
Subjects:
Analytical models
Capacitors
Electromagnetic interference
EMI model
Heat sinks
Heating systems
heatsink connecting patterns
High voltages
mixed-mode EMI phenomenon
MMC
Semiconductor device modeling
submodule switching states
Switches
Switching
Voltage converters
Voltage measurement
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Summary:Modular Multi-level Converter (MMC) is widely used in high voltage occasions for its good power qualities and flexible controls. However, the large number of semiconductor switches would lead to an extremely complicated electromagnetic environment. To clarify the detailed conducted electromagnetic interference (EMI) mechanisms of MMC, this paper builds an EMI model of MMC considering different submodule switching states. Based on this model, the EMI paths of submodule switching-on and switching-off processes are analyzed. Then, this paper analyzes the effects of submodule heatsink connecting patterns on EMI, and explains the mechanisms of mixed-mode (MM) EMI phenomenon that common-mode (CM) component brings in extra differential-mode (DM) component. Simulation and experiment results verify the proposed EMI mechanisms and MM phenomenon. The conclusions of this paper have great reference significance for the EMI research of MMC and other high voltage converters.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2022.3214990