Transient Stability Enhancement with High Shares of Grid-Following Converters in a 100% Converter Grid
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|Title:||Transient Stability Enhancement with High Shares of Grid-Following Converters in a 100% Converter Grid||Authors:||Zhao, Xianxian; Flynn, Damian||Permanent link:||http://hdl.handle.net/10197/13085||Date:||28-Oct-2020||Online since:||2022-08-22T10:53:36Z||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).||Funding Details:||Science Foundation Ireland||Type of material:||Conference Publication||Publisher:||IEEE||Copyright (published version):||2020 IEEE||Keywords:||Grid-forming converter; Grid following converter; Phase locked loop; Low voltage ride through||DOI:||10.1109/isgt-europe47291.2020.9248794||Other versions:||https://ieee-isgt-europe.org||Language:||en||Status of Item:||Peer reviewed||Is part of:||Proceedings of 2020 IEEE PES Innovative Smart Grid Technologies Europe (ISGT-Europe) 26-28 October, 2020||Conference Details:||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/|
|Appears in Collections:||Electrical and Electronic Engineering Research Collection|
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