Stability Analysis and Improvement of Three-Phase Grid-Connected Power Converters with Virtual Inertia Control

Jingyang Fang, Pengfeng Lin, Hongchang Li, Yi Tang, Yongheng Yang

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

Abstract

The lack of inertia issue challenges the frequency control and stability of small-scale modern power systems. To alleviate adverse effects from inertia reduction, three-phase grid-connected power converters are increasingly being used to provide virtual inertia upon system demands. This can be achieved by directly linking the grid frequency and voltage references of DC-link capacitors/ultracapacitors. However, this paper reveals that the virtual inertia control may possibly induce instabilities to power converters under weak grid conditions, which is caused by the coupling between the d- and q-axis as well as the inherent differential operator introduced by the virtual inertia control. To tackle the instability issue, this paper proposes a modified virtual inertia control to mitigate the differential effect. Experimental verifications are provided, which demonstrate the effectiveness of the proposed control in stabilizing three-phase grid-connected power converters for inertia emulation even when connected to weak grids.
Original languageEnglish
Title of host publicationProceedings of IEEE Annual Applied Power Electronics Conference and Exposition (APEC 2019)
Number of pages6
PublisherIEEE Press
Publication dateMay 2019
Pages2400-2405
DOIs
Publication statusPublished - May 2019
Event34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019 - Anaheim, United States
Duration: 17 Mar 201921 Mar 2019

Conference

Conference34th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2019
CountryUnited States
CityAnaheim
Period17/03/201921/03/2019
SponsorIEEE Industry Applications Society (IAS), IEEE Power Electronics Society (PELS), Power Sources Manufacturers Association (PSMA)
SeriesI E E E Applied Power Electronics Conference and Exposition. Conference Proceedings
ISSN1048-2334

Keywords

  • Frequency regulation
  • Power converter
  • Renewable energy
  • Stability
  • Virtual inertia
  • Weak grid

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