Long Distance Subsea Power Transmission and Distribution

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1 Long Distance Subsea Power Transmission and Distribution Peter Baker woodplc.com

2 Contents Parameters used Technology options Cable options Typical distance limitations Typical cost comparison Qualified technology Advantages / disadvantages Power transmission and distribution options Summary 2 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution

3 Parameters used Power 30MW Voltage 110kV Distances up to 600km offshore Water depths to 1500m 3 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution

4 Technology Options AC (3 phase) DC 4 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution

5 Technology Options High Voltage Alternating Current - HVAC (50Hz) Onshore Subsea LVAC 50Hz HVAC 50Hz LVAC 50Hz Generator Transformer LV / HV Transformer HV / LV Subsea Load 5 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution

6 Technology Options Low Frequency High Voltage Alternating Current - LFHVAC (16⅔Hz) Onshore Subsea LVAC 50Hz LFHVAC 16⅔Hz LVAC 50Hz 50Hz 16⅔Hz 16⅔Hz 50Hz Generator Transformer LV / HV Frequency Converter Frequency Converter Transformer HV / LV Subsea Load 6 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution

7 Technology Options High Voltage Direct Current - HVDC Onshore Subsea LVAC 50Hz HVDC LVAC 50Hz Generator Transformer LV / HV AC / DC Converter DC / AC Converter Transformer HV / LV Subsea Load 7 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution

8 Technology Options High Voltage Direct Current - HVDC Onshore Subsea LVAC 50Hz HVDC LVAC 50Hz Generator Transformer LV / HV AC / DC Converter DC / AC Converter Transformer HV / LV Subsea Load 8 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution

9 Cable Options HVDAC & LFHVAC HVDC Single Core HVDC Coaxial Images courtesy of Nexans 9 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution

10 Typical Distance Limitations 10 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution

11 Typical Cost Comparison Cost HVDC cable cost HVAC LFHVAC HVDC LFHVAC cable cost HVAC cable cost LFHVAC terminal costs HVDC terminal costs HVAC terminal costs Distance (km) 11 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution

12 Qualified Technology Item Parameter HVAC LFHVAC HVDC Cable Static Dynamic Shore equipment Generator Transformer Converter N/A Subsea equipment Transformer N/A Converter Variable Speed Drives * Power Conditioning Connectors 12 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution

13 Advantages / Disadvantages System Advantages Disadvantages HVAC Conventional subsea cable technology Cable electrical losses > 100km Conventional topside hardware technology Most subsea hardware not qualified Lowest hardware costs LFHVAC Conventional subsea cable technology Cable electrical losses > 300km Conventional topside hardware technology Lower cable electrical losses compared to HVAC No qualified subsea hardware technology Higher hardware costs > HVAC HVDC Conventional subsea static cable technology Subsea dynamic cable not qualified Conventional topside hardware technology Lowest cable electrical losses No qualified subsea hardware technology Highest hardware costs > LFHVAC 13 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution

14 HVAC Power Transmission <50km Generation / Power conditioning Subsea Load 14 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution

15 HVAC >50km, LFHVAC & HVDC Power Transmission Generation Power conditioning and control capsule Transformer Subsea Load 15 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution

16 HVAC, LFHVAC and HVDC Power Transmission Generation Power conditioning and control buoy Subsea Load 16 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution

17 Summary HVAC < 150km LFHVAC > 150km < 300km HVDC > 300km < 600km 17 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution

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