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Robust Stability Analysis of LCL Filter Based Synchronverter Under Different Grid Conditions
Abstract
Synchronverters have gained interest due to their capability of emulating synchronous machines, offering selfsynchronization to the grid. Despite the simplicity of the control structure, the adoption of an LCL filter makes the overall model complex again, posing questions regarding the tuning of the synchronverter and its robustness. The multi-inputs multi-outputs (MIMO) formulation of the problem requires multivariable analysis. In this paper, the effects of control parameter and grid conditions on the stability of the system are investigated by means of structured singular values (or μ-analysis). A step-by-step design procedure for the control is introduced based on a linearized small-signal model of the system. Then, the design repercussions on the stability performance are evaluated through the performed robustness analysis. The developed linearized model is validated against time-domain simulations and laboratory experiments. These have been carried out using a power hardware-in-the-loop test bench, which allows as to test the synchronverter under different grid conditions. As a conclusion, this paper offers a simple guide to tune synchronverters but also a theoretical solid framework to assess the robustness of the adopted design.
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References 26 · Cited by 89
Research works printed but not linked: 26
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Metadata
- Authors
- Rosso, R., Cassoli, J., Buticchi, G., Engelken, S., & Liserre, M.
- Affiliations
- University of Nottingham Ningbo China (CN)
- Christian-Albrechts-Universität zu Kiel (DE)
- Venue
- IEEE Transactions on Power Electronics
- Published
- 2019-06
- Volume
- 34
- Issue
- 6
- Pages
- 5842-5853
- ISSN
- 0885-8993 (ISSN-L)
- 1941-0107
- OpenAlex
- W2888325694
- Cited by
- 89
- References
- 26
- Citations by year
- 2026: 4 · 2025: 11 · 2024: 14 · 2023: 12 · 2022: 15 · 2021: 17 · 2020: 13 · 2019: 3
- FWCI
- 5.11
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- IEEE Transactions on Power Electronics (publishedVersion)
- Nottingham ePrints (University of Nottingham) (acceptedVersion)
- Topics
- Physical Sciences › Engineering › Control and Systems Engineering › Microgrid Control and Optimization
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Multilevel Inverters and Converters
- Physical Sciences › Engineering › Electrical and Electronic Engineering › Advanced DC-DC Converters
- Keywords
- synchronverter, LCL filter, robust stability, structured singular value analysis, mu-synthesis, grid conditions, small-signal linearization, controller tuning, power hardware-in-the-loop, grid-forming inverters, multivariable control
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