7th IEEE Global Power, Energy and Communication Conference, GPECOM 2025, Bochum, Almanya, 11 - 13 Haziran 2025, ss.902-907, (Tam Metin Bildiri)
The global energy transition increasingly prioritizes the integration of renewable energy sources, particularly those located in remote onshore and offshore regions, into modern power systems. To enable efficient longdistance power transmission, hybrid AC/DC networks integrated with multi-terminal high-voltage direct current (MTHVDC) systems are gaining prominence due to their high transmission capacity and operational reliability. This study employs the Flexible Universal Branch Model (FUBM) to facilitate unified power flow analysis in hybrid AC/DC networks incorporating MTHVDC systems. A key contribution of this work is the integration of photovoltaic (PV) generation into the multi-terminal DC segment of the CIGRE B4 benchmark network, thereby enhancing renewable energy penetration and improving overall operational flexibility. The research extends conventional fault scenarios by simulating the simultaneous outage of multiple generators and transmission lines, thereby assessing the robustness of converter control strategies. The impact of disturbances on voltage profiles, power flow distribution, and converter behavior is analyzed across the network, with specific focus on voltage regulation and power transfer dynamics. The network model is developed and simulated using MATPOWER 7.1, enabling a comprehensive and reproducible evaluation of system performance. The results highlight the effectiveness of the FUBM in analyzing complex AC/DC interactions and enhancing grid stability under various operating conditions and fault scenarios.