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Enhanced Four-Level Active Nested Neutral Point-Clamped Inverter

Author

Listed:
  • Charles Ikechukwu Odeh

    (Department of Electric Drives and Energy Conversion, Faculty of Electrical and Control Engineering, Gdansk University of Technology, ul. Narutowicza 11/12, 80-233 Gdansk, Poland)

  • Arkadiusz Lewicki

    (Department of Electric Drives and Energy Conversion, Faculty of Electrical and Control Engineering, Gdansk University of Technology, ul. Narutowicza 11/12, 80-233 Gdansk, Poland)

  • Marcin Morawiec

    (Department of Electric Drives and Energy Conversion, Faculty of Electrical and Control Engineering, Gdansk University of Technology, ul. Narutowicza 11/12, 80-233 Gdansk, Poland)

  • Andrzej Jąderko

    (Faculty of Electrical Engineering, Czestochowa University of Technology, 42-201 Czestochowa, Poland)

Abstract

The classical four-level nested neutral point-clamped (4L NNPC) inverter-leg is a hybrid of the flying-capacitor and diode-clamped 4L-inverter-leg configurations. Though uniform reduced voltage stress (1/3 of input voltage) on constituting switches is evident in the 4L NNPC inverter-leg, trails of the drawbacks of the diode-clamping concept still exist. With the significantly rated off-the-shelf IGBT switch modules (6.5 kV, 1200 A), chances of deployment of the newly evolved Four-Level Nested T-Type inverter (4L NTTI) in certain applications is high. Compared with the classical 4L NNPC inverter, 4L NTTI involves a smaller number of power switches and low conduction losses. However, in 4L NTTI, two of the six active switches have a blocking voltage rating of 2/3 of the input voltage. Considering this limiting topological feature in 4L NTTI, a six-switch inverter-leg for the four-level active neutral point-clamped (4L ANNPC) inverter is presented in this paper. In the proposed 4L ANNPC inverter-leg, only one switch has a voltage stress of 2/3 of the input voltage. This ameliorated voltage stress translates to low-cost and -loss inverter implementation. The operational characteristics and competitiveness of the 4L ANNPC inverter are analyzed in detail and demonstrated with a prototype.

Suggested Citation

  • Charles Ikechukwu Odeh & Arkadiusz Lewicki & Marcin Morawiec & Andrzej Jąderko, 2024. "Enhanced Four-Level Active Nested Neutral Point-Clamped Inverter," Energies, MDPI, vol. 17(13), pages 1-17, June.
    • Handle: RePEc:gam:jeners:v:17:y:2024:i:13:p:3213-:d:1425837
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