02-04-2010, 03:19 PM
ABSTRACT
Urban electrical power systems with steep demand increase need easily located solutions with short lead time from decision to transmission. While AC cable solutions can offer sufficient power ratings, the problems of load controllability and short circuit power increase with every added circuit. These problems may be countered with Voltage Source Converter (VSC) based technology using Cables for transmission, such as HVDC Light. This technology offers up to 500 MW per station with small footprint, ideal for in feed to city centers. Fast implementation is possible thanks to modular pre-assembled design and extruded polymer underground cables. System benefits from the VSC technology, such as independent full active and reactive power control and no added short circuit power makes it easy to apply in a heavily loaded grid. From an environmental point of view, the dc cable technology gives virtually no alternating magnetic field and no risk for oil leakage. Higher transmission capacity is possible through polymer DC-cables as compared to equivalent AC-cables .A number of different topologies are possible for single or multi-in feed, giving large freedom of design to adapt to each specific network situation.
