Ground Potentials in Transformerless Grid-Connected Multi-Level Power Electronic Converters

S. A. Saleh, A. Al-Durra, R. Ahshan

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

2 Citations (Scopus)

Abstract

This paper aims to develop models for the ground potentials in transformerless grid-connected multi-level power electronic converters (PECs). These PECs are widely used in photovoltaic systems, motor drives, and solid-state power transformers, where they offer reduced input and output harmonic distortions. The desired models for ground potentials are constructed based on common-mode voltages across each leg of the multi-level PECs. The constructed models for ground potentials are to be used for creating local grounding, along with designing adequate grounding circuits for transformerless grid-connected multi-level PECs. An adequate local grounding (for transformerless grid connected PEC) ensures blocking ground currents from flowing through the host grid grounding, and guarantees eliminating ground potentials. The developed models and grounding circuits are evaluated for transformerless grid-connected diode-clamped, flying-capacitor, and cascaded H-bridge multi-level PECs under different operating conditions. Test results demonstrate the significant advantages of the adequate grounding of transformerless grid-connected PECs, in terms of reduced input and output harmonic distortion, minimized ground potentials, and improved efficiency.

Original languageEnglish
Title of host publication2020 IEEE/IAS 56th Industrial and Commercial Power Systems Technical Conference, I and CPS 2020
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728171951
DOIs
Publication statusPublished - Jun 2020
Externally publishedYes
Event56th IEEE/IAS Industrial and Commercial Power Systems Technical Conference, I and CPS 2020 - Las Vegas, United States
Duration: Jun 29 2020 → …

Publication series

NameConference Record - Industrial and Commercial Power Systems Technical Conference
Volume2020-June

Conference

Conference56th IEEE/IAS Industrial and Commercial Power Systems Technical Conference, I and CPS 2020
Country/TerritoryUnited States
CityLas Vegas
Period6/29/20 → …

Keywords

  • and harmonic distortion
  • Grid-connected power electronic converters
  • power system grounding

ASJC Scopus subject areas

  • Engineering(all)

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