Shetland HVDC

Hitachi ABB Power Grids has won a major order from Scottish and Southern Electricity Networks (SSEN) Transmission to enable Europe’s first multi-terminal HVDC interconnection, linking Shetland to the UK transmission system for the first time.

The move, the company said in an announcement will enhance the security of power supply and help transmit wind power generated on the islands, contributing to the UK’s decarbonisation target of bringing all greenhouse gas emissions to net zero by 2050.

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As part of the project, Hitachi ABB Power Grids will deliver and commission an HVDC system, facilitating a multi-terminal link, providing flexibility to transfer power in multiple directions, based on supply and demand, with minimal power losses. This will support power exchange and cost optimisation while lowering carbon footprint.

The HVDC system will convert the harnessed wind power from Alternating Current to Direct Current at an HVDC Converter Station. This power will then be transmitted via underground and subsea cables to an HVDC switching station at Caithness, in the north of Scotland.

It will then be transferred via the Caithness Moray HVDC link before being converted back to AC for onward transmission to meet electricity demand in the north of Scotland and beyond, forming a three-terminal DC-system.

“This innovative HVDC solution will enable SSEN Transmission to efficiently connect and transport renewable energy and deliver clean power to consumers while enhancing grid reliability,” said Niklas Persson, managing director of the Grid Integration business at Hitachi ABB Power Grids.

Persson: “This project is another example of our new business model focused on our core technology, and reinforces our commitment to a sustainable energy future as the partner of choice for enabling a stronger, smarter and greener grid.”

The HVDC connection will play a key role in the development of Shetland’s renewable energy potential by connecting it to what will be the UK’s largest onshore windfarm. Scheduled for completion in 2024, the system is enabled for future connections and integration of more renewables.

“We are delighted to be working again with Hitachi ABB Power Grids for the Shetland HVDC link, building on the experience and strong track record we have established following the construction and operation of the Caithness Moray link,” said Sandy Mactaggart, SSEN Transmission’s Director of Offshore Delivery. “The HVDC link will deliver substantial socio-economic and environmental benefits to Shetland’s, Scotland’s and UK’s economy, supporting hundreds of skilled jobs in the process.”

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