Urban Power Grid Enhancement and Modernization with VSC-HVDC Interties

Power grids of large or mega cities are continuously upgrading to meet the growing demand for power and replace old-style local generation with power supplies from external cleaner sources. Advanced transmission technologies can effectively increase the delivery capacity, flexibility and utilization of existing infrastructure. The focus of this paper is on VSC-HVDC subtransmission technologies for urban power grid enhancement and modernization. The discussions include urban power grid expansion issues, VSC-HVDC application scenarios, advanced technical schemes of VSC-HVDC intertie in subtransmission network, and control features for grid support under emergency conditions.