Use of voltage limits for current limitation in grid-forming converters

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Title: Use of voltage limits for current limitation in grid-forming converters
Authors: Chen, JunruPrystupczuk, FedericoO'Donnell, Terence
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Date: 13-Feb-2020
Online since: 2021-08-20T17:24:21Z
Abstract: Renewable generation interfaced through grid-forming converters are proposed as a replacement for synchronous generators in power systems. However, compared to the synchronous generator, the power electronics converter has a strict limit on the current to avoid overcurrent damage. The grid-forming converter acts like a voltage source, directily controlling the voltage. This conflicts with the operation of the conventional current limit control, which is applied to a current source. The switch between the voltage control and current control aimed to impose the current limit leads to synchronization instability. This paper proposes a novel control scheme which can be applied to the grid forming voltage control in order to enforce current limits. The proposed method has been verified through simulation and hardware tests in both symmetrical and asymmetrical faults to perform current suppression while maintaining synchronization stability in the voltage control mode.
Funding Details: Science Foundation Ireland
Funding Details: ESIPP UCD
Type of material: Journal Article
Publisher: Power System Technology Press
Journal: CSEE Journal of Power and Energy Systems
Volume: 6
Issue: 2
Start page: 259
End page: 269
Copyright (published version): 2019 CSEE
Keywords: Angle-power curveCurrent limitGrid-forming converterVoltage limit
DOI: 10.17775/cseejpes.2019.02660
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Language: en
Status of Item: Peer reviewed
ISSN: 2096-0042
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Appears in Collections:Electrical and Electronic Engineering Research Collection

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