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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)13757-13769
Number of pages13
Journal / PublicationIEEE Transactions on Power Electronics
Volume38
Issue number11
Online published9 Aug 2023
Publication statusPublished - Nov 2023

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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)

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