Frequency Dynamics in Fully Non-Synchronous Electrical Grids: A Case Study of an Existing Island

Mariano G. Ippolito, Rossano Musca, Eleonora Riva Sanseverino and Gaetano Zizzo
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Mariano G. Ippolito: Engineering Department, University of Palermo, 90128 Palermo, Italy
Rossano Musca: Engineering Department, University of Palermo, 90128 Palermo, Italy
Eleonora Riva Sanseverino: Engineering Department, University of Palermo, 90128 Palermo, Italy
Gaetano Zizzo: Engineering Department, University of Palermo, 90128 Palermo, Italy

Energies, 2022, vol. 15, issue 6, 1-24

Abstract: The operation of a power system with 100% converter-interfaced generation poses several questions and challenges regarding various aspects of the design and the control of the system. Existing literature on the integration of renewable energy sources in isolated systems mainly focuses on energy aspects or steady-state issues, and only a few studies examine the dynamic issues of autonomous networks operated with fully non-synchronous generation. A lack of research can be found in particular in the determination of the required amount of grid-forming power, the selection of the number and rated power of the units which should implement the grid-forming controls, and the relative locations of the grid-forming converters. The paper aims to address those research gaps starting from a theoretical point of view and then by examining the actual electrical network of an existing island as a case study. The results obtained from the investigations indicate specific observations and design opportunities, which are essential for securing the synchronization and the stability of the grid. Possible solutions for a fully non-synchronous operation of autonomous systems, in terms of dynamic characteristics and frequency stability, are presented and discussed.

Keywords: microgrids; frequency control; grid-forming; 100% converter-interfaced generation; virtual synchronous machine (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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