A modified dq impedance model of three-phase grid-connected inverter-grid system considering coupling between inverter and grid

Weihua Zhou, Yanbo Wang, Raymundo E. Torres-Olguin, Dong Liu, Zhe Chen

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

3 Citations (Scopus)

Abstract

This paper presents a modified dq impedance model of the three-phase voltage source grid-connected inverter (GCI)-grid system considering coupling effect between GCI part and grid part for small-signal stability analysis. Steady-state terminal voltage and current information of the GCI part which are necessary in conventional dq impedance modelling methods are calculated based on grid parameters, i.e., grid voltage and grid impedance, and current references of current-controlled GCI or power references of power-controlled GCI. In addition, effects of dynamics of grid voltage and phase-locked loop (PLL) on dq impedance characteristics of grid part are also investigated, which enables the modified dq impedance model of grid part to relate with that of GCI part. The modified dq impedance model of the GCI part which takes the effects of grid voltage and grid impedance into account need not know steady-state terminal voltage and current information. In addition, the modified dq impedance model of grid part may provide accurate stability analysis during grid voltage changes. The insight of instability mechanism of the GCI-grid coupling system may be facilitated using the modified dq impedance models. Simulation results are given to validate correctness of the proposed dq impedance model of the GCI-grid system, and effectiveness of the dq impedance model for stability analysis.

Original languageEnglish
Title of host publicationAPEC 2020 - 35th Annual IEEE Applied Power Electronics Conference and Exposition
EditorsConor Quinn
Place of PublicationPiscataway NJ USA
PublisherIEEE, Institute of Electrical and Electronics Engineers
Pages2409-2416
Number of pages8
ISBN (Electronic)9781728148298, 9781728148281
ISBN (Print)9781728148304
DOIs
Publication statusPublished - 2020
Externally publishedYes
EventAnnual IEEE Applied Power Electronics Conference and Exposition (APEC) 2020 - New Orleans, United States of America
Duration: 15 Mar 202019 Mar 2020
Conference number: 35th
https://ieeexplore.ieee.org/xpl/conhome/9121924/proceeding (Proceedings)
https://www.aconf.org/conf_146267.html (Website)

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC
PublisherIEEE, Institute of Electrical and Electronics Engineers
Volume2020-March
ISSN (Print)1048-2334
ISSN (Electronic)2470-6647

Conference

ConferenceAnnual IEEE Applied Power Electronics Conference and Exposition (APEC) 2020
Abbreviated titleAPEC 2020
Country/TerritoryUnited States of America
CityNew Orleans
Period15/03/2019/03/20
Internet address

Keywords

  • Coupling effect
  • dq impedance model
  • grid dynamics
  • grid-connected inverter
  • stability analysis
  • terminal voltage

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