부산대학교 도서관

Rooftop solar photovoltaic (PV) installations play a crucial role in advancing PV penetration within distribution systems. Solar plants on rooftops, particularly those without energy storage, emerge as a cost-effective alternative when compared to conventional fossil fuel-based generation. However, as the proportion of solar PV within a distribution system increases, concerns about voltage swelling arise, especially under lightly loaded conditions. This issue becomes more pronounced in underground cable-based distribution systems due to their high R/X ratio, potentially leading to the curtailment of solar PV generation.In this work, we developed an IEEE 33-bus distribution system in MATLAB to assess the maximum allowable rooftop PV penetration without violating voltage limits. The same IEEE 33-bus network was then modified into a cable-based distribution system to investigate voltage swelling effects. In a comparative analysis between cable-based and overhead-based IEEE 33 bus systems, we found that the maximum allowable rooftop PV penetration is lower in cable-based networks. Simulation results suggest that blindly increasing rooftop PV penetration in a metropolitan cable-based system may lead to voltage instability. Careful planning is essential to ensure the sustainable integration of PV systems without compromising network stability.