Suitable Submodule Switch Rating for Medium Voltage Modular Multilevel Converter Design

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Abstract

An important step in Voltage-Source Modular Multilevel Converter (MMC) design is the selection of adequate semiconductor blocking voltage class. This paper highlights that particularly for grid connected medium voltage applications, the choice of suitable switch blocking voltage class is not so straightforward. The market available switch voltage ratings results in a discrete integer relationship for the number of submodules (N) with a fixed dc link voltage. This is shown to introduce interesting design trade-offs in consideration to investment costs, required capacitance for reasonable ripple voltage, submodule redundancy requirements, conduction switching losses. Using the example of a 10 MVA half bridge MMC connected to a 10 kV grid, it is shown that 1.7 kV and 3.3 kV insulated gate bipolar transitors (IGBTs) can be possible choices as compared to 1.2 kV, 4.5 kV and 6.5 kV blocking voltage.

Original languageEnglish
Title of host publication2018 IEEE Energy Conversion Congress and Exposition, ECCE 2018
EditorsA.M. Omekanda
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages3980-3987
Number of pages8
ISBN (Electronic)978-147997311-8
DOIs
Publication statusPublished - 2018
Event10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018 - Portland, United States
Duration: 23 Sep 201827 Sep 2018

Conference

Conference10th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2018
CountryUnited States
CityPortland
Period23/09/1827/09/18

Keywords

  • Cascaded cells
  • Half bridge
  • High power
  • IGBT
  • Medium voltage distribution
  • Multilevel converter design
  • MVDC
  • Number of submodules
  • Optimum semiconductor voltage level

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