ABB has commenced operations for the 500kV Skagerrak 4 high-voltage direct current (HVDC) light link connecting Norway and Denmark.

The HVDC link raises the availability of electricity in the regional power grid from renewable hydroelectric and wind projects.

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Voltage source converters (VSC) are installed onto the link, which converts electricity from high-voltage alternating current to direct current and back.

The link also acts as a support to the power grid owned by Norwegian transmission system operator Statnett and Denmark’s Energinet.dk.

"ABB pioneered the HVDC technology and continues innovating as it is uniquely positioned in the industry with in-house manufacturing for all key HVDC components."

The fully operational link will balance the loads between Norway’s hydroelectric-based system and Denmark’s wind- and thermal-based generation.

ABB has worked on three other of Skagerrak system’s links, with this being the fourth. It delivered the first two links in the 1970s, and the third in 1993.

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The entire system crosses the Skagerrak Strait in North Sea. It is spread across 240km and has a transmission capacity of 1.7GW.

The new link operates in bipolar mode with the Skagerrak 3 link, which uses classic line commutated converter HVDC technology.

ABB Power Systems division head Claudio Facchin said: "ABB pioneered the HVDC technology and continues innovating as it is uniquely positioned in the industry with in-house manufacturing for all key HVDC components, including power semiconductors, converters, converter transformers and high-voltage cables."