Grid Forming Converter Angular Speed Freezing to Enhance Transient Stability in 100% Grid Forming and Mixed Power Systems

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Title: Grid Forming Converter Angular Speed Freezing to Enhance Transient Stability in 100% Grid Forming and Mixed Power Systems
Authors: Zhao, XianxianFlynn, Damian
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Date: 2-Aug-2022
Online since: 2022-08-29T13:24:38Z
Abstract: The transient stability of a power system depends on the relative divergence of angular speeds between voltage sources during a fault disturbance. A unified angular speed control strategy is proposed here for grid-forming and synchronous machine voltage sources. Specifically, for a system consisting only of grid-forming converters (GFs), the virtual angular speed of all GFs is proposed to be frozen to the pre-fault value, while for a system with a mix of grid-forming converters and synchronous machines (SMs), the virtual angular speed of the GFs should be frozen to the weighted mean of the SM rotor speeds. The proposed freezing techniques are designed to be effective for short-circuit faults, and to be indifferent to phase-jump events. Simulation studies are performed on 100% GF and mixed GF/SM systems for both 3-phase fault and phase-jump events, for a range of GF control settings and system conditions, to demonstrate the effectiveness of the virtual angular speed freezing techniques.
Funding Details: Science Foundation Ireland
Type of material: Conference Publication
Publisher: Elsevier
Journal: IFAC-PapersOnLine
Volume: 55
Issue: 9
Start page: 425
End page: 430
Copyright (published version): 2022 The Authors
Keywords: Grid-forming convertersSynchronous generatorsTransient stabilityVirtual angular speedSynchronization stabilityShort-circuit faultsPhase-jump disturbances
DOI: 10.1016/j.ifacol.2022.07.074
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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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