Open AccessAn Improved Control Strategy to Suppress the DC-Link Voltage Fluctuation for PMSG Wind Turbines
Author(s) -
Peng Wang,
Jie Li,
Wei Shi
Publication year - 2020
Publication title -
journal of physics: conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
ISSN - 1742-6588
DOI - 10.1088/1742-6596/1659/1/012029
Subject(s) - voltage droop , control theory (sociology) , wind power , permanent magnet synchronous generator , feed forward , voltage , frequency grid , computer science , voltage source , engineering , control (management) , electrical engineering , control engineering , artificial intelligence
Frequency droop control can provide active power for permanent magnet synchronous generator (PMSG) wind turbines when grid frequency varies. However, it would cause dc-link voltage fluctuations. According to the law of the dc-link voltage fluctuations, a improved feedforward control method is proposed to limit voltage fluctuations through adjusting the feedforward coefficient from a fixed value to an variable value in this paper. Compared with the traditional current feedforward control method, it has better performance in stabilizing the dc-link voltage. Results demonstrate that the dc-link voltage fluctuations can be reduced by 70% in some specified cases, which proves that the proposed strategy can be applied to protect dc-link capacitor when PMSG wind turbines provide system inertia supports by frequency droop control. PMSG wind turbines can work as traditional thermal power to provide system inertia supports when grid frequency varies. The analysis results is very beneficial to widely application of PMSG wind turbines.