Protection Circuitry Design to Mitigate Failure Propagation for 10 kV SiC MOSFETs in a 22 kV DC 13.8 kV AC Flying Capacitor Multilevel Converter
2023 IEEE 24th Workshop on Control and Modeling for Power Electronics (COMPEL)(2023)
摘要
The operation and failure modes of the flying capacitor multilevel converter topology are well-known and the protections for Si IGBT-based converters are well established. However, when it comes to high voltage SiC MOSFET-based converters there are some particularities that must be evaluated: shorter energy withstanding time, higher dv/dt and higher insulation stress. This paper provides an assessment of the failure modes for a 7-level 13.8 kV AC 22 kV DC 1.1 MVA three-phase flying capacitor converter using 10 kVSiC MOSFETs, an analysis of the fault propagation mechanism between cells and the design of a transient voltage suppressor (TVS) diode-based protection module to prevent it.
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关键词
Flying Capacitors Multilevel Converters (FCML),Multicell Converter,Protection,Short-Circuit Fault,SiC MOSFET,TVS diode,Flashover Fault
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