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Nonlinear Grey-Box Converter Modeling for Interoperability Specifications in Multi-Vendor Power Grids

Date: 02/10/2025
Time: 9:00 am
Presenter: Federico Cecati
Abstract: (Sponsored by PELS TC 8) Power electronics-dominated grids can experience different stability problems, including low-damped oscillations and bus voltage violations. These issues are particularly challenging to be addressed in multi-vendor converter-dominated grids, due to the confidentiality of the converters’ control system by different vendors, the nonlinearity of converter dynamics, and the wide range of grid operating conditions. This webinar proposes an analytical methodology to define control tuning specifications able to guarantee interoperability among converters and grid stability, considering different operating points and bus voltage levels. A nonlinear grey-box modelling framework for multi-vendor converter-dominated grids is presented. The tool is able to predict potential overvoltage/undervoltage conditions by means of generalized power flow analysis, and to determine precise converters interoperability specifications valid under different grid operating conditions. The resulting specifications are in the form of frequency-domain tuning boundaries, which give to the converter vendors enough freedom of implementation for their control system, while respecting the confidentiality of their IP-protected information.

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Federico Cecati received the M.Sc. degree in Automatic Control in 2017 from the University of L’Aquila, L’Aquila, Italy, and the PhD degree in 2023 at the Chair of Power Electronics, Kiel University, Kiel, Germany. In 2023 he joined Fraunhofer ISIT, Itzehoe, Germany, and became Project Leader of one industrial project and a joint national research project. He was a Guest Researcher at the Automatic Control Laboratory, ETH, Zurich, Switzerland in 2024, and at the Institute of Energy Technology, Aalborg University, Aalborg, Denmark in 2020. Since 2025, he is Assistant Professor at the Department of Industrial Engineering, University of Trento, Trento, Italy. In 2025 he has been an Adjunct Lecturer at Kiel University, Kiel, Germany. His research interests include modelling, stability analysis, harmonic propagation and control in power electronics-based power systems and battery storage systems. He received the Excellent Peer Reviewer Award for the CSEE Journal of Power and Energy Systems in the years 2022-2024.