Effect of DC-Side Dynamics on Interactions in Grid-Forming Inverter Systems

The power modulations carried out by a grid-forming inverter are profoundly affected by the capability of the inverter's dc-side circuit to support such modulations. Although preliminary work on dc microgrids includes the dc-side dynamics, analysis of potential ac-side interactions in the prese...

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Bibliographic Details
Published in:IEEE transactions on energy conversion 2024-10, p.1-13
Main Authors: Thilekha, T., Filizadeh, S., Annakkage, U. D., Karawita, C., Muthumuni, D.
Format: Article
Language:English
Subjects:
dc-side dynamics
eigenvalue analysis
Eigenvalues and eigenfunctions
Grid following
Grid forming
Grid-forming inverters
HVDC transmission
interactions
Inverters
Microgrids
Power system dynamics
Power system stability
Synchronous machines
Transformers
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Summary:The power modulations carried out by a grid-forming inverter are profoundly affected by the capability of the inverter's dc-side circuit to support such modulations. Although preliminary work on dc microgrids includes the dc-side dynamics, analysis of potential ac-side interactions in the presence of grid-forming inverters is lacking. This paper presents an in-depth study of the interactions in grid-forming inverter systems considering the critical dynamics contributed by the inverter's dc-side circuitry. The study in this paper is based upon dynamic phasor modeling and eigenvalue analysis techniques. The results presented for an exemplar system of a grid-forming inverter paralleled with a synchronous machine prove the significance of including dc-side dynamics to accurately capture the full range of interactions that may occur in such systems. Detailed electromagnetic transient simulation results from PSCAD/EMTDC are included to verify the validity of the predictions of the dynamic-phasor-based model.
ISSN:0885-8969
1558-0059
DOI:10.1109/TEC.2024.3474481