期刊
ELECTRIC POWER SYSTEMS RESEARCH
卷 212, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.epsr.2022.108449
关键词
Grid-following; Grid-forming; STATCOM; Small-signal stability; Wind power plant
This paper presents a comparative analysis of a static synchronous compensator (STATCOM) based on battery energy storage system for stability enhancement of offshore wind power plants. The results show that the grid-forming control offers evident stability margin and damping to the WPPs, especially in weak grids, superior to the grid-following STATCOM. The small-signal models and comparative analysis are validated through electromagnetic transients simulations.
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 similar to 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.
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