@inproceedings{688f4178d7c54808bdd961ed55191d77,
title = "Complex-Vector PLL for Enhanced Synchronization with Weak Power Grids",
abstract = "This paper proposes a complex-vector based phase-locked loop (PLL) that can eliminate the frequency-coupling terms caused by the asymmetric dynamics of the conventional PLL. In the approach, a complex phase angle with both real and imaginary components is introduced, which enables to control the direct- and quadrature-axis components symmetrically. As a result, the original multiple-input multiple-output (MIMO) system can be simplified to single-input-single-output (SISO) complex transfer functions, which greatly facilitates the system stability analysis. Moreover, the dangerous subsynchronous oscillation hazard caused by the frequency coupling of the conventional PLL can be avoided, and SISO impedance shaping technique can be utilized to enhance the grid synchronization stability under the weak grid condition. The complex-vector PLL is verified by both the theoretical analysis and experimental tests.",
keywords = "Frequency coupling, impedance modeling, MIMO, PLL, SISO impedance shaping",
author = "Dongsheng Yang and Xiongfei Wang and Frede Bl{\aa}bjerg and Fangcheng Liu and Kai Xin and Yunfeng Liu",
year = "2018",
month = sep,
day = "10",
doi = "10.1109/COMPEL.2018.8459976",
language = "English",
isbn = "978-1-5386-5542-9",
series = "IEEE Workshop on Control and Modeling for Power Electronics (COMPEL) ",
publisher = "IEEE Press",
pages = "1--6",
booktitle = "Proceedings of 2018 IEEE 19th Workshop on Control and Modeling for Power Electronics (COMPEL)",
note = "19th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2018 ; Conference date: 25-06-2018 Through 28-06-2018",
}