Stability identification for grid-connected inverters with LCL filters considering grid-voltage feedforward regulator

Minghui Lu, Frede Blaabjerg

Research output: Contribution to book/anthology/report/conference proceedingArticle in proceedingResearchpeer-review

5 Citations (Scopus)

Abstract

This paper identifies stable resonance frequency range for grid-connected inverter with Grid-Voltage Feedforward Regulator (GVFR). Beginning with the current loop stability analysis without GVFR, system poles distribution is analytically studied in z-domain, the critical frequency is therefore calculated as well as the control gain limit. Then, this paper reveals the GVFR would change the system stability in the weak power system, two frequency boundaries and three typical resonance frequency ranges are identified and compared. System poles distribution shows that GVFR can offer damping effects when resonance frequency is below ωs/3, in contrast, over which GVFR will destabilize the system. The theoretical analysis is validated by experimental tests based on a laboratory-scale prototype.
Original languageEnglish
Title of host publicationProceedings of 2017 IEEE 18th Workshop on Control and Modeling for Power Electronics (COMPEL)
Number of pages5
PublisherIEEE Press
Publication dateJul 2017
ISBN (Electronic)978-1-5090-5326-1
DOIs
Publication statusPublished - Jul 2017
Event18th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2017 - Stanford, United States
Duration: 9 Jul 201712 Jul 2017

Conference

Conference18th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2017
Country/TerritoryUnited States
CityStanford
Period09/07/201712/07/2017

Keywords

  • Stability analysis
  • Grid-connected inverter
  • LCL-filter
  • Grid-voltage feedforward

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