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Offshore Wind Plant Electrical Systems - BOEM

NREL is a national laboratory of the Department of Energy, Office of Energy Efficiency and Renewable Energy, operated by the Alliance for Sustainable Energy, LLC. Offshore wind Plant Electrical Systems BOEM Offshore Renewable Energy Workshop Ian Baring-Gould July 29-30, 2014 NATIONAL RENEWABLE ENERGY LABORATORY Major Offshore wind Farm BOS Components 2 Foundations Grounded (monopile, gravity, tripod, etc.) Floating (ballast, mooring, buoyancy stabilizations, etc.) wind farm collector system Inter-turbine Medium Voltage (MV) AC cables (typically kV) Substation platform with transformer and Electrical equipment Converter platform if High Voltage (HV) DC transmission is used Transmission to shore HVAC or HVDC submarine cable Cable landing HVAC or HVDC land cable On-shore converter station for HVDC Onshore substation/interconnection Source: NSW Submarine Power BOS = Balance of system or Bala

Offshore Plant Cabling – Current State of the Art • Radial designs have been used in European offshore wind farms • 22-33 kV MV infield cables • Usually single substation platform (in some cases 2 platforms) • 132-155 kV export cables • Spacing between turbines in a row: 5-10 rotor diameters • Spacing between rows: 712 rotor -

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