Achieving zero carbon emissions by 2050 in South Korea necessitates significant restrictions on coal and natural gas power plants, along with increased reliance on renewable energy sources (RES). This transition drives the development of high voltage dc (HVdc) systems to efficiently transmit renewable energy. The intermittent nature of RES leads to real-time power imbalances, prompting research into HVdc systems for essential system services such as frequency control and power balancing. As RES expands, a multi-terminal dc network will be needed to enhance inter-grid power sharing, with centralized and decentralized control strategies managing power flow and grid stability.