HVDC > HVDC Light > HVDC Light converter technology > HVDC Light converter
The valves in HVDC Light form in its basic configuration a two-level three-phase bridge with six valves.
 | Each valve consists of a number of series connected IGBTs.(Read more about ABB's StakPak IGBT design here). For high power ratings more than hundred are connected in series. |
Even voltage distribution is achieved during all phases of operation with a special gate unit and a voltage divider for each IGBT level.
The IGBT together with voltage divider, gate unit and heat-sink is mounted in a stack (up to 30 level in a stack) as a mechanical unit. Turn on/off of each single IGBT is ordered via an optical link from the valve control on ground potential. The IGBT level is cooled with de-ionized water. ( Link to:
SwedeWater )
The valve is of indoor design and normally mounted in enclosures at the factory. (
See picture!)
Inside HVDC Light valve enclosure with IGBT Valves (Troll A)
.