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 reg ards to both cost and performance, a multiterminal HVDC system might b e an interesting alternative of the conventional HVAC system. The perf ormances of such a multiterminal system have been studied. The simulat ion results have shown that great improvement might be offered by the introduction of such a multiterminal HVDC system especially with regar d to the power quality and disturbances at earth fault in the system.