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woodplc.com
Long Distance Subsea
Power Transmission
and Distribution
Peter Baker
• Parameters used
• Technology options
• Cable options
• Typical distance limitations
• Typical cost comparison
• Qualified technology
• Advantages / disadvantages
• Power transmission and distribution options
• Summary
Contents
2 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution
• Power 30MW
• Voltage 110kV
• Distances up to 600km offshore
• Water depths to 1500m
Parameters used
3 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution
• AC (3 phase)
• DC
Technology Options
4 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution
High Voltage Alternating Current - HVAC (50Hz)
Technology Options
5 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution
Generator Transformer
LV / HV
Transformer
HV / LV
Subsea Load
Onshore Subsea
HVAC 50HzLVAC 50Hz LVAC
50Hz
Low Frequency High Voltage Alternating Current - LFHVAC (16⅔Hz)
Technology Options
6 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution
Generator Transformer
LV / HV
Transformer
HV / LV
Subsea Load
Onshore Subsea
50Hz
16⅔Hz
Frequency
Converter
50Hz
16⅔Hz
LFHVAC 16⅔HzLVAC 50Hz LVAC 50Hz
Frequency
Converter
High Voltage Direct Current - HVDC
Technology Options
7 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution
Generator Transformer
LV / HV
Transformer
HV / LV
Subsea
Load
Onshore Subsea
AC / DC
Converter
HVDCLVAC 50Hz LVAC 50Hz
DC / AC
Converter
High Voltage Direct Current - HVDC
Technology Options
8 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution
Generator Transformer
LV / HV
Transformer
HV / LV
Subsea
Load
Onshore Subsea
AC / DC
Converter
HVDCLVAC 50Hz LVAC 50Hz
DC / AC
Converter
Cable Options
9 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution
HVDC Single Core
Images courtesy of Nexans
HVDAC & LFHVAC HVDC Coaxial
Typical Distance Limitations
10 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution
Typical Cost Comparison
11 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution
Cost
Distance (km)
HVAC
cable cost
HVAC
terminal costs
LFHVAC
cable cost
LFHVAC
terminal costs
HVDC
cable cost
HVDC
terminal costs
HVDC
HVAC
LFHVAC
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 ✓ ✓
Qualified Technology
12 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution
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 No qualified subsea hardware technology
Lower cable electrical losses compared to
HVACHigher hardware costs > HVAC
HVDC Conventional subsea static cable technology Subsea dynamic cable not qualified
Conventional topside hardware technology No qualified subsea hardware technology
Lowest cable electrical losses Highest hardware costs > LFHVAC
Advantages / Disadvantages
13 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution
HVAC Power Transmission <50km
14 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution
Generation /
Power
conditioning
Subsea Load
HVAC >50km, LFHVAC & HVDC Power Transmission
15 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution
Subsea Load
Generation
Power conditioning
and control capsule
Transformer
HVAC, LFHVAC and HVDC Power Transmission
16 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution
Subsea Load
Generation
Power
conditioning and
control buoy
Summary
17 A presentation by Wood. Long Distance Subsea Power Transmission and Distribution
HVAC < 150km
LFHVAC > 150km < 300km
HVDC > 300km < 600km
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