List of HVDC projects
through interconnectors using high-voltage direct-current involves usually two converter stations and a transmission line. Generally overhead lines are used, but an important class of HVDC projects use submarine power cables. A back-to-back station has no transmission line and joins two separate AC grids at a single point. Historical HVDC systems used the Thury system of motor-generators but these have all been made obsolete by later developments such as mercury-arc valves, thyristors, and IGBT power transistors.
Legend
Converter technology:- Thury = Series-connected generators as designed by René Thury
- Merc = Mercury-arc valve rectifier and inverter
- Thyr = Thyristor rectifier and inverter
- IGBT = Insulated gate bipolar transistor
- BIGT = Bi-mode insulated gate transistor
- IEGT = Injection enhanced gate transistor
Africa
Australia and Oceania
Asia
Europe
2 As of 9 December 2015, LitPol Link started trial operations.3 Caithness Moray HVDC serves a number of renewable energy sources in the north of Scotland - see map
4 Contracts due to be placed in 2016.
5 Elia says construction expected to start in late 2017.
6 Date is that quoted to support the Shetland Wind Farm that SSE is a part investor in.
7 Decision on project expected in 2017 following consultation - see SSE PD reference.