Multiterminal HVDC systems in urban areas of large cities

Subtransmission and distribution systems for large cities are usually built up of underground cable systems of considerable length. With regards to both cost and performance, a multiterminal HVDC system might be an interesting alternative of the conventional HVAC system. The performances of such a multiterminal system have been studied. The simulation results have shown that great improvement might be offered by the introduction of such a multiterminal HVDC system especially with regard to the power quality and earth fault disturbances in the system.