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Econnect LtdEconnect Ltd
Independent specialists in the grid integration of renewable energy...
Grid Connections: Lessons from Round One
Grid Connections: Lessons from Round One
Paul Glendinning
Operations Manager
Econnect Offshore Credentials
Econnect Offshore Credentials
• Designed 7 offshore wind farms
• Research for the DTI – Medium Voltage Systems for Offshore Windfarms
• Electrical Construction Management at North Hoyle
IntroductionIntroduction
• Onshore work for Offshore Projects
• Differences ?
• What are the issues ?
• Solutions
• Conclusions
Onshore work for Offshore Projects
Onshore work for Offshore Projects
• Substation connections
• Either at 132kV or 33kV for the 30 to 60 turbine wind farms
• Cable connections
• Onshore Cable interconnection facility
North Hoyle ProgressNorth Hoyle Progress
• Onshore works
• Offshore / Onshore Interface
North Hoyle ProgressNorth Hoyle Progress
• Onshore works
• Cable Installation through the streets
North Hoyle ProgressNorth Hoyle Progress
• Onshore Works
• Careful management in public areas
North Hoyle ProgressNorth Hoyle Progress
• Onshore works
• Protection of cables in road
North Hoyle ProgressNorth Hoyle Progress
• Onshore works
• Careful route selection around a playing field
Differences ?Differences ?
• Electrical connection arrangements
• Radial versus Interconnected systems
• Cost of repairs – mobilisation of vessels
• Shore link cable environment
Differences ?Differences ?
• Repair and fault finding Crew ?
What are the issues ?What are the issues ?
• Switching, protection and Isolation
• Subsea cable fault repair
• Failure minimisation – maximise revenue
• Electrical losses
Solutions - Switching, Protection and IsolationSolutions - Switching,
Protection and Isolation
• Increasing degrees of automation required
• Use of motorised ring switches
• Use of Fault Passage Indicators
• Reduce visits to farm
• Avoid personnel transfer to turbines
Solutions - Switching, Protection and IsolationSolutions - Switching,
Protection and Isolation
Wind Turbine 1 Wind Turbine 2 Wind Turbine 3 Wind Turbine 4 Wind Turbine 5
Fault Current Fault Current
Cable Fault
FPI FPI FPI FPI
Grid Connection
Solutions - Subsea cable fault repair
Solutions - Subsea cable fault repair
• Use of Time Domain Reflectometers or search coil
• Cable on shore link may be tens of meters away from original burial position
• Burial methods require careful analysis
Solutions - Failure minimisation
Solutions - Failure minimisation
• Cost of single cable fault in 60 MW wind farm is £650K
• Use of standby power from Offshore diesel equipment
• Use of interconnected electrical systems
Solutions - Failure minimisation
Solutions - Failure minimisation
• Layout at North Hoyle
Solutions - environmentSolutions - environment
• Equipment utilised must have a marinised specification
• Shore link cable requires careful analysis of burial depth and protection requirements – Geotechnical data required.
ConclusionsConclusions
• Onshore electrical arrangements – not valid
• The protection of the shore link cable is critical compared to inter-link cables
• Equipment utilised must be marinised• Invest in cable specification and
installation protection• Invest in Electrical topology
Econnect LtdEconnect Ltd
Independent specialists in the grid integration of renewable energy...