Alstom has won a 40 million Euro contract to increase the capacity of the Konti-Skan high-voltage direct current (HDVC) undersea transmission system between Sweden and Denmark.
The contract forms two parts, one with Swedish transmission network operator Svenska KraftnÃ¤t and the other with its Danish counterpart ELTRA, and covers the replacement of the converter stations at each side of the Kattegat, at Vester Hassing, Denmark and Lindome, Sweden.
The existing 275 MW link, which allows the two countries to exchange power, is nearing the end of its design lifetime and Alstom will replace the 1960s mercury arc scheme with the latest thyristor-based technology, increasing the power to 380 MW.
Under the contracts, Alstom, via its Transmission and Distribution Sector, will design, construct and supply equipment for the two converter stations, whose components include converter transformers, control systems, thyristor valves, DC smoothing reactors, switchgear, harmonic filters and capacitor banks.
The project follows the recent completion of another HVDC scheme, the back-to-back HVDC interconnector at Sasaram in India, which completed the nation’s national grid.