Supply of MV Island with High-Penetration of Prosumer Renewable Energy Sources

Krzysztof Dobrzynski, Zbigniew Lubośny, Jacek Klucznik, Paweł Bućko (), Sławomir Noske, Mirosław Matusewicz, Michał Brodzicki, Maciej Klebba and Arkadiusz Frącz
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Krzysztof Dobrzynski: Faculty of Electrical and Control Engineering, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland
Zbigniew Lubośny: Faculty of Electrical and Control Engineering, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland
Jacek Klucznik: Faculty of Electrical and Control Engineering, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland
Paweł Bućko: Faculty of Electrical and Control Engineering, Gdansk University of Technology, Narutowicza 11/12, 80-233 Gdansk, Poland
Sławomir Noske: ENERGA-OPERATOR SA, Marynarki Polskiej 130, 80-557 Gdansk, Poland
Mirosław Matusewicz: ENERGA-OPERATOR SA, Marynarki Polskiej 130, 80-557 Gdansk, Poland
Michał Brodzicki: Faculty of Mechanical and Electrical Engineering, Institute of Electrical Engineering, Polish Naval Academy, Smidowicza 69, 81-127 Gdynia, Poland
Maciej Klebba: Faculty of Mechanical and Electrical Engineering, Institute of Electrical Engineering, Polish Naval Academy, Smidowicza 69, 81-127 Gdynia, Poland
Arkadiusz Frącz: Faculty of Mechanical and Electrical Engineering, Institute of Electrical Engineering, Polish Naval Academy, Smidowicza 69, 81-127 Gdynia, Poland

Energies, 2025, vol. 18, issue 10, 1-21

Abstract: The rapid development of prosumer renewable energy sources (RESs) observed in Poland in recent years causes problems in distribution networks such as current amplitude and voltage asymmetry increases, power and energy loss increases, and reverse power flows, and related are voltage control problems, deterioration of energy quality, etc. Moreover, in the case of planned repair/maintenance works in the network and the need to supply energy consumers in an islanded MV grid, the problem of the correct operation of such a subsystem appears. This occurs when the power production by the prosumers’ energy sources at a given moment exceed the power consumption. In such a case, reverse power flows occur in MV/LV transformers, i.e., from the LV network to the MV network. This causes reverse power flow to the diesel generator, leading to its shutdown and, in extreme cases, to damage. The solution to this problem is to use a mobile system equipped with energy storage in addition to a diesel generator and an LV/MV transformer. An additional problem in the case of using a mobile system (diesel generator) to power an MV island is the islanded MV network grounding. Grid islanding changes the earth fault current and electric shock voltages. In general, MV networks in Poland operate as compensated, i.e., grounding transformers are used, the star point of which is grounded by a compensation choke. Unfortunately, in the case of powering an MV island from a mobile system, there is no real possibility of grounding the star point of the LV/MV transformer used there. This article proposes an algorithm of a diesel generator with an energy storage selection, including electric shock protection requirements verification, for the use in suppling energy via an islanded MV network.

Keywords: uninterruptible power supply of MV island; prosumer RES; energy storage (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: 2025
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