Advanced transmission
VSC HVDC 1, HVDC classic and UHVDC 2 systems up to the Gigawatt range significantly reduce transmission losses. FACTS 3 compensate reactive power in AC systems.
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Thyristors have dominated this application for many decades. Nowadays thyristors as well as IGBTs are used in HVDC systems and FACTS to fulfill different needs. Especially grid access systems for offshore wind farms far away from the coast require the turn-off capabilities of IGBTs. Thyristors are targeted at bulk power transmission, such as UHVDC systems with up to 800 kilovolts.
1) Voltage Sourced Converter High Voltage Direct Current
2) Ultra High Voltage Direct Current
3) Flexible AC Transmission Systems