Impact of virtual inertia on increasing the hosting capacity of island diesel-PV ac-grid

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4 Citations (Scopus)


A key constraint to the penetration level or hosting capacity (HC) of PV power in ac-island power systems (IPS) is the resulting frequency volatility. Frequency volatility is directly tied to the inertia level in the grid. Since inertia-less PV power displaces synchronous generators (SG), and thereby their available rotational inertia, the inertia level is reduced and the frequency volatility increased. Frequency volatility can be quantified by the Rate of Change of Frequency (RoCoF). The RoCoF is used as a performance index to determine the HC. Virtual inertia compensation (VIR) by chemical battery storage (BESS) can increase the HC of the grid and allow for more PV power to be integrated. The impact of PI-based VIR on increasing the HC in a 17.5 MVA diesel powered IPS is studied. Results indicate that when added PV without VIR displaced SGs the RoCoF limit could not be upheld. When VIR is added the RoCoF is improved and an HC of up to 3 MW PV is obtained. For the suggested RoCoF limit of -1.45 Hz/s and the studied scenarios it is shown that, in percentage of peak load, diesel-based generation could be replaced by 25% PV, providing that 9% of BESS with VIR is added.

Original languageEnglish
Title of host publicationProceedings - 2018 53rd International Universities Power Engineering Conference, UPEC 2018
Place of PublicationPiscataway
PublisherInstitute of Electrical and Electronics Engineers
Number of pages6
ISBN (Electronic)978-1-5386-2910-9
Publication statusPublished - 20 Nov 2018
Event53rd International Universities Power Engineering Conference (UPEC 2018) - Glasgow Caledonian University, Glasgow, United Kingdom
Duration: 4 Sep 20187 Sep 2018
Conference number: 53


Conference53rd International Universities Power Engineering Conference (UPEC 2018)
Abbreviated titleUPEC 2018
Country/TerritoryUnited Kingdom
Internet address


  • energy storage
  • Frequency response
  • PV-diesel isolated power system
  • virtual inertia


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