Impact Factor:4.6
DOI number:10.1109/JESTPE.2025.3526821
Journal:IEEE Journal of Emerging and Selected Topics in Power Electronics
Key Words:Alternating-voltage control (AVC), stability enhancement, voltage source converter (VSC), weak grid.
Abstract:Alternating-voltage control (AVC) is preferred in weak grids to enhance voltage stiffness and active power transfer capability for grid-following voltage source converters (VSCs) with a phase-locked loop (PLL). However, asymmetric dq coupling of control loops is intensified with the AVC due to reactive currents, which leads to undesired interactions and thus risks weak-grid instability. To tackle stability challenge considering the AVC, a parameter tuning approach is first proposed to design the AVC according to the system rating. Based on that, the impact of the AVC on the intensified dq coupling, stability region, and voltage dynamics are co-investigated. To enhance weak-grid operations, a stability enhancement control (SEC) is further proposed to reversely compensate for the negative coupling effects induced by the PLL and AVC. The proposed scheme enables rated power operations of the VSC in ultraweak grids. Experiments confirm the validity of the proposed method.
Indexed by:Journal paper
Discipline:Engineering
Document Type:J
Volume:13
Issue:2
Page Number:2270-2284
ISSN No.:2168-6785
Translation or Not:no
Date of Publication:2025-01-17
Included Journals:SCI
Links to published journals:https://ieeexplore.ieee.org/document/10830484