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Comparative Analysis of the Substitution Effect of Smart Inverter-Based Energy Storage Systems on the Improvement of Distribution System Hosting Capacity Using Vertical Photovoltaic Systems

Author

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  • Seungmin Lee

    (KEPCO Research Institute, 11 Hyeoksinsandan 1-gil, Naju 58277, Republic of Korea)

  • Garam Kim

    (KEPCO Research Institute, 11 Hyeoksinsandan 1-gil, Naju 58277, Republic of Korea)

  • Seungwoo Son

    (KEPCO Research Institute, 11 Hyeoksinsandan 1-gil, Naju 58277, Republic of Korea)

  • Junghun Lee

    (KEPCO Research Institute, 11 Hyeoksinsandan 1-gil, Naju 58277, Republic of Korea)

Abstract

Renewable energy sources, particularly solar photovoltaics (PVs), are rapidly expanding to achieve carbon neutrality. Integrated photovoltaic (IPV) solutions in underutilized spaces offer a viable option for countries with land constraints and public opposition. Vertical PV (VPV) systems, featuring bifacial solar modules installed vertically, facing east and west, present a promising alternative. In contrast to conventional tilted PV (CPV) systems, which peak around midday, VPV systems generate more power in the morning and afternoon. This mitigates issues such as the duck curve and curtailment caused by midday overgeneration. Moreover, combining VPV and CPV systems can increase the solar hosting capacity of a distribution line (DL) for PV-system interconnections, driving research interest. This study assessed the hosting-capacity improvements from VPV systems by analyzing voltage fluctuations and thermal constraints using OpenDSS software (Version 9.1.1.1). The potential substitution effect of a smart inverter-based energy-storage system (ESS) was also explored. The analysis, based on real-grid conditions in South Korea, incorporated actual DL data, generation and demand profiles, and operational data from both VPV and CPV systems. Worst-case scenarios were simulated to evaluate their impact on grid stability. The results demonstrate that VPV systems can increase hosting capacity by up to 23% and ensure stable grid operation by reducing power-generation uncertainties.

Suggested Citation

  • Seungmin Lee & Garam Kim & Seungwoo Son & Junghun Lee, 2025. "Comparative Analysis of the Substitution Effect of Smart Inverter-Based Energy Storage Systems on the Improvement of Distribution System Hosting Capacity Using Vertical Photovoltaic Systems," Energies, MDPI, vol. 18(16), pages 1-15, August.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:16:p:4307-:d:1723682
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    References listed on IDEAS

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