AUTHOR=Kim Juhwan , Lee Jaehyeong , Kang Sungwoo , Hwang Sungchul , Yoon Minhan , Jang Gilsoo TITLE=Probabilistic Optimal Power Flow-Based Spectral Clustering Method Considering Variable Renewable Energy Sources JOURNAL=Frontiers in Energy Research VOLUME=Volume 10 - 2022 YEAR=2022 URL=https://www.frontiersin.org/journals/energy-research/articles/10.3389/fenrg.2022.909611 DOI=10.3389/fenrg.2022.909611 ISSN=2296-598X ABSTRACT=Power system clustering is an effective method for providing voltage control and preventing failure propagation. There are various methods for power system clustering. A graph theory-based spectral clustering method is widely used, as it is a simple approach with a short calculation time. However, a spectral clustering method can only be applied in a system environment where the power generation amount and load are known. Moreover, it is often impossible to sufficiently reflect the influences of volatile power sources (such as renewable energy sources) in the clustering. To this end, this study proposes a probabilistic spectral clustering algorithm applicable to a power system including a photovoltaic (PV) model for volatile energy sources and classification method for neutral buses. The algorithm is a clustering method for reflecting the random outputs of PV sources, and the neutral buses can be reclassified as a result of the clustering to obtain the optimal clustering results. The algorithm is verified through an IEEE 118-bus test system including PV sources.