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Energies
Volume 14
Issue 5
10.3390/en14051420
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Article

A Low-Voltage DC Backbone with Aggregated RES and BESS: Benefits Compared to a Traditional Low-Voltage AC System

by
Hakim Azaioud
1,*,
Robbert Claeys
1,
Jos Knockaert
1,
Lieven Vandevelde
2,3 and
Jan Desmet
1
1
EELab/Lemcko, Department of Electromechanical, Systems and Metal Engineering, Ghent University, 8500 Kortrijk, Belgium
2
EELab, Department of Electromechanical, Systems and Metal Engineering, Ghent University, 9052 Ghent, Belgium
3
[email protected]—Corelab EEDT-DC, Flanders Make, 9052 Ghent, Belgium
*
Author to whom correspondence should be addressed.
Academic Editor: Mario Marchesoni
Energies 2021, 14(5), 1420; https://doi.org/10.3390/en14051420
Received: 25 January 2021 / Revised: 19 February 2021 / Accepted: 23 February 2021 / Published: 4 March 2021
(This article belongs to the Special Issue Load Modelling of Power Systems)
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Abstract

The increasing penetration of PV into the distribution grid leads to congestion, causing detrimental power quality issues. Moreover, the multiple small photovoltaic (PV) systems and battery energy storage systems (BESSs) result in increasing conversion losses. A low-voltage DC (LVDC) backbone to interconnect these assets would decrease the conversion losses and is a promising solution for a more optimal integration of PV systems. The multiple small PV systems can be replaced by shared assets with large common PV installations and a large BESS. Sharing renewable energy and aggregation are activities that are stimulated by the European Commission and lead to a substantial benefit in terms of self-consumption index (SCI) and self-sufficiency index (SSI). In this study, the benefit of an LVDC backbone is investigated compared to using a low-voltage AC (LVAC) system. It is found that the cable losses increase by 0.9 percent points and the conversion losses decrease by 12 percent points compared to the traditional low-voltage AC (LVAC) system. The SCI increases by 2 percent points and the SSI increases by 6 percent points compared to using an LVAC system with shared meter. It is shown that an LVDC backbone is only beneficial with a PV penetration level of 65% and that the BESS can be reduced by 22% for the same SSI. View Full-Text
Keywords: LVDC; self-sufficiency index; load aggregation; power converters; photovoltaic; efficiency LVDC; self-sufficiency index; load aggregation; power converters; photovoltaic; efficiency
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MDPI and ACS Style

Azaioud, H.; Claeys, R.; Knockaert, J.; Vandevelde, L.; Desmet, J. A Low-Voltage DC Backbone with Aggregated RES and BESS: Benefits Compared to a Traditional Low-Voltage AC System. Energies 2021, 14, 1420. https://doi.org/10.3390/en14051420

AMA Style

Azaioud H, Claeys R, Knockaert J, Vandevelde L, Desmet J. A Low-Voltage DC Backbone with Aggregated RES and BESS: Benefits Compared to a Traditional Low-Voltage AC System. Energies. 2021; 14(5):1420. https://doi.org/10.3390/en14051420

Chicago/Turabian Style

Azaioud, Hakim, Robbert Claeys, Jos Knockaert, Lieven Vandevelde, and Jan Desmet. 2021. "A Low-Voltage DC Backbone with Aggregated RES and BESS: Benefits Compared to a Traditional Low-Voltage AC System" Energies 14, no. 5: 1420. https://doi.org/10.3390/en14051420

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