Transient Synchronization Stability of Grid-Following Converters Considering Nonideal Current Loop

Chao Charles Liu; Jingxi Yang; Chi K. Tse; Meng Huang

doi:10.1109/TPEL.2023.3303447

Author(s)

Chao Charles Liu
Jingxi Yang
Chi K. Tse
Meng Huang

Related Research Unit(s)

Department of Electrical Engineering

Detail(s)

Original language	English
Pages (from-to)	13757-13769
Number of pages	13
Journal / Publication	IEEE Transactions on Power Electronics
Volume	38
Issue number	11
Online published	9 Aug 2023
Publication status	Published - Nov 2023

Link(s)

DOI	DOI https://doi.org/10.1109/TPEL.2023.3303447 Final Published version
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Attachment(s)	Documents 164666185.pdf Post-print, 8.73 MB, PDF Publisher's Copyright Statement © 2023 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. Liu, C. C., Yang, J., Tse, C. K., & Huang, M. (2023). Transient Synchronization Stability of Grid-Following Converters Considering Nonideal Current Loop. IEEE Transactions on Power Electronics, 38(11), 13757-13769. https://doi.org/10.1109/TPEL.2023.3303447.
Link to Scopus	https://www.scopus.com/record/display.uri?eid=2-s2.0-85167796705&origin=recordpage
Permanent Link	https://scholars.cityu.edu.hk/en/publications/publication(93b48398-4e58-46b0-8646-7c8bc2d1663b).html

Abstract

The widely deployed grid-following converters (GFLCs) may lose synchronization under grid disturbances, presenting a critical challenge to the power electronics penetrated power grid. Existing methods for analyzing transient synchronization stability often assume an ideal current loop in order to keep the system model at low order. However, such approaches based on a simplified second-order model can lead to optimistic stability prediction and inappropriate design. This paper applies a full-order model to explore the effects of the nonideal current loop. The unstable periodic orbits (UPOs) that determine the basin of attraction of the stable equilibrium point are located via a numerical continuation method. Moreover, the essential bifurcations leading to the emergence and disappearance of UPOs are identified. A design principle with consideration of the effects of the nonideal current loop is derived to enhance the transient synchronization stability of GFLCs. Experimental results are provided to verify the analytical findings. © 2023 IEEE.

Research Area(s)

Transient synchronization stability, current loop, grid-following converter, basin of attraction, numerical continuation, Basin of attraction (BOA), gridfollowing converter (GFLC)