Large-signal Stability Analysis of Three-phase Grid-following Inverters

This work analytically establishes a multi-variable energy function for a three-phase grid-following inverter leveraging a unified equivalent-circuit model for its physical- and control-layer subsystems. This is a significant contribution to the prior art in which analytical approaches to large-sign...

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Bibliographic Details
Published in:IEEE transactions on energy conversion 2024, p.1-15
Main Authors: Pal, Diptak, Panigrahi, Bijaya Ketan, Johnson, Brian, Venkatramanan, D., Dhople, Sairaj
Format: Article
Language:English
Subjects:
Circuit stability
Critical clearing time
equivalent circuit
grid-following
Integrated circuit modeling
Inverters
large-signal stability
Numerical stability
Phase locked loops
Power system stability
Stability criteria
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Summary:This work analytically establishes a multi-variable energy function for a three-phase grid-following inverter leveraging a unified equivalent-circuit model for its physical- and control-layer subsystems. This is a significant contribution to the prior art in which analytical approaches to large-signal stability for inverters have largely been attempted with simplified models. Central to our effort is to cast physical- and control-layer dynamics of each dynamical subsystem as an equivalent circuit consisting of familiar circuit elements adopting a positive-sequence modeling framework. An energy function for the inverter is then constructively synthesized by summing the energy functions across the various subsystems that are readily derived from circuit-theoretic principles. Numerical simulations are presented to validate the equivalent-circuit model of the inverter as well as the efficacy of the synthesized energy function in characterizing large-signal stability following a disturbance.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2023.3323446