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, XianxianFlynn, Damian
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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 converterGrid following converterPhase locked loopLow voltage ride through
DOI: 10.1109/isgt-europe47291.2020.9248794
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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
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Appears in Collections:Electrical and Electronic Engineering Research Collection

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