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Utility-Scale Storage Integration in the Maltese Medium-Voltage Distribution Network

Author

Listed:
  • Alexander Micallef

    (Department of Industrial Electrical Power Conversion, University of Malta, MSD 2080 Msida, Malta)

  • Cyril Spiteri Staines

    (Department of Industrial Electrical Power Conversion, University of Malta, MSD 2080 Msida, Malta)

  • Alan Cassar

    (Network Planning & Operations Control Centre, Enemalta PLC, MRS 1571 Marsa, Malta)

Abstract

Deployment of renewable energy sources in Malta is limited by grid integration constraints. Photovoltaic (PV) systems pose a significant risk to grid stability due to their inherent intermittency and result in overvoltages at the medium-voltage and low-voltage networks. Investments in utility-scale battery energy storage systems (BESS) will facilitate further deployment of renewables and will help to achieve energy security. This study proposed a novel sizing strategy for utility-scale battery energy storage systems (BESS) based only on technical considerations to find the minimum required storage capacity based on historical electricity demand and PV generation. The modeling and simulation were constrained to a section of the Gozitan 11 kV electrical distribution network and the results showed that the utility-scale storage can reduce the impact of PV systems on the grid infrastructure by avoiding reverse power flows and improve the local energy security by reducing the peak electricity demand. The central BESS and the decentralized coordinated BESS with “equal sizing” stored 3.4 MWh while the decentralized coordinated BESSs with “optimal sizing” stored 5.307 MWh. In all three cases, the evening peak demand was reduced by 30.5% from 2.62 MW down to a defined limit of 1.82 MW. From the results presented in this paper, the “optimal sizing” strategy showed that the BESSs have most benefit when installed next to the local PV generation. Hence, by deploying coordinated utility-scale BESSs sized according to the PV generation potential, it is expected that the penetrations of PV generation can be increased even with the present distribution network infrastructure.

Suggested Citation

  • Alexander Micallef & Cyril Spiteri Staines & Alan Cassar, 2022. "Utility-Scale Storage Integration in the Maltese Medium-Voltage Distribution Network," Energies, MDPI, vol. 15(8), pages 1-20, April.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:8:p:2724-:d:789203
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    References listed on IDEAS

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    Cited by:

    1. Kwang-Hoon Yoon & Joong-Woo Shin & Tea-Yang Nam & Jae-Chul Kim & Won-Sik Moon, 2022. "Operation Method of On-Load Tap Changer on Main Transformer Considering Reverse Power Flow in Distribution System Connected with High Penetration on Photovoltaic System," Energies, MDPI, vol. 15(17), pages 1-17, September.
    2. Alexander Micallef & Cyril Spiteri Staines & John Licari, 2022. "Renewable Energy Communities in Islands: A Maltese Case Study," Energies, MDPI, vol. 15(24), pages 1-21, December.

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