The thyristor valve in HVDC transmission

The application of thyristor valves rather than mercury-arc valves for rectification in high-voltage dc transmission systems has increased. Schemes in service include Eel River in New Brunswick, Canada, the Gotland extension in Sweden, and the Sakuma extension in Japan. Basic circuits, design, construction, and operation methods are discussed for the use of thyristor valves in HVDC transmission. (MCW)