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  5. Transient Stability Enhancement with High Shares of Grid-Following Converters in a 100% Converter Grid
 
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Transient Stability Enhancement with High Shares of Grid-Following Converters in a 100% Converter Grid

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Author(s)
Zhao, Xianxian 
Flynn, Damian 
Uri
http://hdl.handle.net/10197/13085
Date Issued
28 October 2020
Date Available
22T10:53:36Z August 2022
Abstract
With increasing shares of power electronics-based generation in power grids, grid-following converters may become unstable during faults, resulting from a loss of phase-locked loop (PLL) synchronism. Even when current grid code low voltage ride through (LVRT) requirements are met, PLLs may still become unstable under high shares of grid-following converters, due to much reduced reactive current support from (online) synchronous generators or grid-forming converters. Consequently, a readily implementable transient stability enhancement approach is developed for grid-following converters using a reactive current priority current limiting strategy for faults on a transmission network. The proportional gain for the reactive current injection is determined by formulating an optimization-based transient stability problem, which ensures a valid PLL equilibrium point, maximizes active power output, fully exploits converter current capacity, and, at least, satisfies existing grid code LVRT requirements. An additional PLL frequency-feedback PI term is used to enhance PLL dynamic stability, in recognition of parameter estimation errors and imperfect control. A case study (100% converter-based grid) verifies that the proposed solution enables grid robustness against faults and the permissible share of grid-following converters to be increased (especially in weak grids).
Sponsorship
Science Foundation Ireland
Type of Material
Conference Publication
Publisher
IEEE
Copyright (Published Version)
2020 IEEE
Keywords
  • Grid-forming converte...

  • Grid following conver...

  • Phase locked loop

  • Low voltage ride thro...

DOI
10.1109/isgt-europe47291.2020.9248794
Web versions
https://ieee-isgt-europe.org
Language
English
Status of Item
Peer reviewed
Part of
Proceedings of 2020 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) 26-28 October, 2020
Description
The 2020 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe), Delft, The Netherlands, 26-28 October 2020
ISBN
978-1-7281-7100-5
This item is made available under a Creative Commons License
https://creativecommons.org/licenses/by-nc-nd/3.0/ie/
Owning collection
Electrical and Electronic Engineering Research Collection
Scopus© citations
2
Acquisition Date
Jan 27, 2023
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Views
307
Acquisition Date
Jan 27, 2023
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Downloads
33
Acquisition Date
Jan 27, 2023
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