@inproceedings{b290f622a1f44b199c59f2eca109f042,
title = "A Simple Impedance Reshaping Method for Stability Enhancement of Grid-Following Inverter Under Weak Grid",
abstract = "The conventional vector current control (VCC) scheme has been widely used in the grid-connected inverter systems. However, it suffers from power limitation problems under weak grid conditions. This paper reveals that the dynamic effect of the phase-locked loop (PLL) is the main reason for destabilizing the small-signal stability of the grid-following inverter. The positive feedback introduced by the PLL can be observed from the small-signal control structure. Reshaping the converter output impedance can counteract the positive feedback and reduce the negative resistance in the impedance model. A novel impedance reshaping method is proposed in this paper, which can enhance the small-signal stability and extend the stability range of the system. Simulation results verify the effectiveness of the proposed method.",
keywords = "grid-following inverter, vector current control, small-signal model, stability enhancement, weak grid",
author = "Liang Huang and Chao Wu and Dao Zhou and Frede Blaabjerg",
year = "2021",
doi = "10.1109/PEDG51384.2021.9494181",
language = "English",
isbn = "978-1-6654-4643-3",
series = "IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG) ",
pages = "1--6",
editor = "Mazumder, {Sudip K.} and Balda, {Juan Carlos} and Lina He and Jianzhe Liu and Ankit Gupta",
booktitle = "2021 IEEE 12th International Symposium on Power Electronics for Distributed Generation Systems (PEDG)",
note = "2021 IEEE 12th International Symposium on Power Electronics for Distributed Generation Systems ; Conference date: 28-06-2021 Through 01-07-2021",
}