Grid-Forming Converter Current Limiting Design to Enhance Transient Stability for Grid Phase Jump Events

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Title: Grid-Forming Converter Current Limiting Design to Enhance Transient Stability for Grid Phase Jump Events
Authors: Zhao, XianxianFlynn, Damian
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Date: 2-Aug-2022
Online since: 2022-08-29T13:27:44Z
Abstract: Grid-forming converters (GFs) are seen as a replacement for synchronous machines in future power systems. Compared with synchronous machines, GFs provide much reduced overcurrent capability and hence they experience current saturation more frequently for the same capacity. Moreover, once in current saturation, GFs have limited regulation capability, and can become unstable if the current limiting control is improperly designed. Hence, in order to enhance GF stability when subject to phase jump down disturbances and current saturation, a combination of virtual impedance (VI) current limiting and scaling current reference saturation control is proposed. A relatively large virtual reactance-resistance ratio is also recommended. To speed up GF recovery, an (increased) transient P/f droop gain is proposed for downward phase jumps, but not fault conditions. Simulation studies on a simple system under large phase-jump events, i.e. ±60°, confirm the effectiveness of the proposed approach.
Funding Details: Science Foundation Ireland
Type of material: Conference Publication
Publisher: Elsevier
Journal: IFAC-PapersOnLine
Volume: 55
Issue: 9
Start page: 140
End page: 145
Copyright (published version): 2022 The Authors
Keywords: Grid-forming convertersVirtual impedance current limiting controlCurrent saturationPhase jump disturbancessynchronous machinesTransient stability
DOI: 10.1016/j.ifacol.2022.07.025
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Language: en
Status of Item: Peer reviewed
Conference Details: IFAC-CPES 2022: 11th Symposium on Control of Power and Energy Systems, Online, 21-23 June 2022
ISSN: 2405-8963
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Appears in Collections:Electrical and Electronic Engineering Research Collection

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