Enhanced Operation of Grid-Following VSCs With Alternating-Voltage Control in Ultraweak Grids
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影响因子：4.6
DOI码：10.1109/JESTPE.2025.3526821
发表刊物：IEEE Journal of Emerging and Selected Topics in Power Electronics
关键字：Alternating-voltage control (AVC), stability enhancement, voltage source converter (VSC), weak grid.
摘要：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.
论文类型：期刊论文
学科门类：工学
文献类型：J
卷号：13
期号：2
页面范围：2270-2284
ISSN号：2168-6785
是否译文：否
发表时间：2025-01-17
收录刊物：SCI