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Sunrise Wind converts to HVDC
New York project is the USA’s first offshore wind farm to opt for high voltage direct current transmission
In a consortium with Aker Solutions, Siemens Energy is supplying the HVDC transmission system that will connect Sunrise Wind, New York’s first utility-scale offshore wind project, to the mainland. It will be the first offshore wind project in the United States to employ HVDC technology. The 924 MW wind farm, which will use Siemens Gamesa wind turbines, is being developed by a joint venture of Ørsted and US-based energy provider Eversource.
Located about 50 km (30 miles) east of Long Island, Sunrise Wind will support New York State in helping to meet its goal of achieving 100% clean electricity by 2040.
“To date, we have connected the offshore grid to the mainland 21 times in Europe, bringing more than 12 gigawatts of wind power ashore in Europe. We are now able to proceed with our very first offshore HVDC grid connection project in the United States”, said Tim Holt, member of the executive board at Siemens Energy. “Carbon- neutrality goals will not be met without wide-scale deployment of renewable energy projects like Sunrise Wind. There will be many more wind projects like this in the US.”
Siemens Energy will deliver the HVDC system on a turnkey basis and provide onshore civil work in partnership with local companies.
New Jersey
Rhode Island
Connecticut New York
Holbrook
Sunrise Wind
The Sunrise wind farm location is around 30 miles east of Long Island’s Montauk Point, but the grid connection point (DC to AC converter) will be at Holbrook, about 100 miles away. This distance, combined with the wind farm’s installed capacity (924 MW), meant it was a suitable candidate for HVDC
The offshore AC to DC converter station will collect the 66 kV AC power generated by the wind turbines via the inter-array cable system and transform it to 320 kV DC for transmission through a 160 km export cable to the onshore DC to AC converter station, located at Holbrook on Long Island.
Aker Solutions is responsible for the offshore converter platform, consisting of a steel jacket substructure, and a topside platform deck housing the electrical equipment. Sunrise Wind will support the establishment of an “enduring offshore wind supply chain in New York State”, says Siemens, with the onshore installation of the project’s converter station to be carried out by local companies. The final deliveries are scheduled for the second half of 2025. Siemens Energy is also supplying main electrical equipment for the grid connection of the Coastal Virginia Offshore Wind (CVOW) project – located approximately 27 miles (43 km) off the coast of Virginia Beach – which is employing HVAC transmission. At 2.6 GW it is the largest offshore wind project under development in the US. Siemens Energy is delivering the HV electrical equipment for the three 800 MW offshore transformer platforms. For each platform, Siemens Energy is delivering three power transformers, three shunt reactors, one medium-voltage gas insulated switchgear (GIS) and three high- voltage GIS systems to Semco Maritime. The platform design aims to significantly reduce both size and weight, lessening the need for steel.
Above: Visualisation of Sunrise Wind offshore HVDC converter station 36 | November/December 2021 |
www.modernpowersystems.com
Cable contracts for the CVOW project have been awarded by Dominion Energy to a consortium of Prysmian and the DEME Group. Prysmian Group will provide three 3-core 220 kV HVAC export cables measuring approximately 62 km each, with XLPE insulation. Prysmian will also supply 320 km of 3-core 66 kV offshore inter-array cables with XLPE insulation.
Long Island
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