A Hybrid GaN + Si based Cascaded H-bridge Multi-Level Inverter and PWM scheme for Improved Efficiency

Prince Kumar, Venkatramanan Devasahayam, Abhijit Kshirsagar, Ned Mohan

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Scopus citations

Abstract

This paper proposes a hybrid Gallium Nitride (GaN) and Silicon (Si) multilevel converter and a PWM method for its operation, for reduced switching losses without significant increase in the system cost. Multi-level converters with high frequency converter have become popular due to high efficiency, low harmonics and small size compared to line traditional frequency transformers. The multi-level output voltage enables direct connection of renewables to medium/high voltage level collection grids. The hybrid power-circuit architecture described in this paper, which is well-suited for renewable integration, has a single primary side inverter and several series connected sub-modules on the secondary-side. Each sub-module consists of a high-frequency transformer, a diode bridge rectifier and H-bridge. In the proposed hybrid scheme, only one sub-module (SM) per phase employs GaN devices, and switches at high frequency to produce pulse-width modulated output voltage. All other sub-modules consist of conventional Si devices switching at near-fundamental frequency. Such a combination reduces the overall converter cost while also yielding high efficiency. The paper presents simulation and experimental results verifying the topology and the proposed PWM scheme on a nine-level H-Bridge multi-level converter hardware. Detailed topology analysis and and a brief loss budget is also included.

Original languageEnglish (US)
Title of host publication2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages296-301
Number of pages6
ISBN (Electronic)9781728151359
DOIs
StatePublished - 2021
Event13th IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Virtual, Online, Canada
Duration: Oct 10 2021Oct 14 2021

Publication series

Name2021 IEEE Energy Conversion Congress and Exposition, ECCE 2021 - Proceedings

Conference

Conference13th IEEE Energy Conversion Congress and Exposition, ECCE 2021
Country/TerritoryCanada
CityVirtual, Online
Period10/10/2110/14/21

Bibliographical note

Publisher Copyright:
© 2021 IEEE.

Keywords

  • GaN
  • Modular Multilevel Converter
  • Pulse width modulation
  • Si
  • Switching losses
  • Wide Band Gap (WBG) devices

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