Comprehensive assessment of transient stability for grid-forming converters considering current limitations, inertia and damping effects

Chen, Jinlei, Gong, Qingyuan, Zhang, Yawen, Fawad, Muhammad, Wang, Sheng ORCID: https://orcid.org/0000-0002-2258-2633, Li, Chuanyue ORCID: https://orcid.org/0000-0001-6835-6642 and Liang, Jun ORCID: https://orcid.org/0000-0001-7511-449X 2024. Comprehensive assessment of transient stability for grid-forming converters considering current limitations, inertia and damping effects. CSEE Journal of Power and Energy Systems

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Abstract

This paper presents a quantitative assessment of the transient stability of grid-forming converters, taking into account current limitations, inertia, and damping effects. The contributions are summarized in two main aspects: First, the analysis delves into transient stability under a general voltage sag scenario for a converter subject to current limitations. When the voltage sag surpasses a certain threshold, transient instability becomes a concern, with the severity of this instability being influenced by inertia and damping coefficients within the swing equation. Second, a comprehensive evaluation of these inertia and damping effects is conducted using a model-based phase-portrait approach. This method allows for an accurate assessment of critical clearing time (CCT) and critical clearing angle (CCA) across varying inertia and damping coefficients. Leveraging data obtained from the phase portrait, an artificial neural network (ANN) method is presented to model CCT and CCA accurately. This precise estimation of CCT enables the extension of practical operation time under faults compared to conservative assessments based on equal-area criteria (EAC), thereby fully exploiting the system’s low-voltage-ride-through (LVRT) and fault-ride-through (FRT) capabilities. The theoretical transient analysis and estimation method proposed in this paper are validated through PSCAD/EMTDC simulations.

Item Type:	Article
Status:	In Press
Schools:	Engineering
ISSN:	2096-0042
Date of First Compliant Deposit:	2 September 2024
Date of Acceptance:	26 August 2024
Last Modified:	07 Nov 2024 05:00
URI:	https://orca.cardiff.ac.uk/id/eprint/171762

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