Two-Layer Current Sharing Control of Parallel Connected Grid Inverters with Specified Line Impedance Uncertainties

Yi Cheng Chen, Ying Yu Tzou

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Parallel operation of grid inverters for AC nanogrids requires robust power sharing as well as fast dynamic responses. This paper proposes a two-layer current sharing control scheme for parallel connected inverters with specified uncertainties of line impedances. The inner layer controller is designed to achieve a desired output impedance with specified voltage THD under nonlinear rectifier load. The outer layer controller is designed to provide robust current sharing control by using virtual impedance control with specified line impedance uncertainties. Simulation and experimental verifications have been carried out to illustrate the performance of the proposed two-layer current sharing control scheme.

Original languageEnglish
Title of host publicationProceedings
Subtitle of host publicationIECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society
PublisherIEEE Computer Society
Pages3956-3961
Number of pages6
ISBN (Electronic)9781728148786
DOIs
StatePublished - Oct 2019
Event45th Annual Conference of the IEEE Industrial Electronics Society, IECON 2019 - Lisbon, Portugal
Duration: 14 Oct 201917 Oct 2019

Publication series

NameIECON Proceedings (Industrial Electronics Conference)
Volume2019-October

Conference

Conference45th Annual Conference of the IEEE Industrial Electronics Society, IECON 2019
CountryPortugal
CityLisbon
Period14/10/1917/10/19

Keywords

  • AC nanogrid
  • current sharing control
  • droop control
  • grid inverter
  • line impedance uncertainties
  • output impedance
  • parallel operation
  • virtual impedance

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