Comparative study of battery-based STATCOM in grid-following and grid-forming modes for stabilization of offshore wind power plant

Fangzhou Zhao*, Xiongfei Wang, Zichao Zhou, Łukasz Kocewiak, Jan R. Svensson

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This paper presents a comparative analysis of a static synchronous compensator (STATCOM) based on battery energy storage system with grid-following and grid-forming operations utilized for stability enhancement of offshore wind power plants (WPPs). The small-signal model of a typical offshore WPP system is developed first, then compared from two perspectives – oscillation index for stability margin evaluation of a multi-input multi-output system and damping ratio of dominant poles, with respect to the critical control parameters. The theoretical comparative analysis proves that the grid-forming control offers evident stability margin and damping to the WPPs especially in weak grids, superior to the grid-following STATCOM. This conclusion holds true for most conditions with properly designed parameters, including different bandwidths of the alternating voltage control of STATCOM in 1∼10 Hz and phase-locked loop of grid-following STATCOM ranging from 5 to 100 Hz, which is benefited from the sufficient stability margin of GFM mode. The small-signal models and comparative analysis are corroborated by electromagnetic transients (EMT) simulations.

Original languageEnglish
Article number108449
JournalElectric Power Systems Research
Volume212
ISSN0378-7796
DOIs
Publication statusPublished - Nov 2022

Bibliographical note

Publisher Copyright:
© 2022 Elsevier B.V.

Keywords

  • Grid-following
  • Grid-forming
  • Small-signal stability
  • STATCOM
  • Wind power plant

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