1. © ABB Group May 1, 2015 | Slide 1 Large scale integration of Offshore Wind Power Design Considerations Peter Sandeberg /ABB, EOW 2009, 15.09.2009

2. © ABB Group May 1, 2015 | Slide 2 A global leader in power and automation technologies Leading market positions in main businesses  120,000 employees in about 100 countries  $35 billion in revenue (2008)  Formed in 1988 merger of Swiss and Swedish engineering companies  Predecessors founded in 1883 and 1891  Publicly owned company with head office in Switzerland

3. © ABB Group May 1, 2015 | Slide 3 Offshore wind power, Transmission technologies 10 50 100km MW 600 300 100 HVAC + FACT S HVDC Light HVAC

4. © ABB Group May 1, 2015 | Slide 4 Grid Connection by HVAC Onshore Offshore Sub-Sea Cable transmission AC network Collection grid On-shore S/S Reactive Power Compensation Off-shore HV Substation

5. © ABB Group May 1, 2015 | Slide 5 Design Criteria  Robust  Safe  High Availability  Environmental withstand  Long Lifetime  Electrical Compliant  Connectable to any technology  Cost efficient

6. © ABB Group May 1, 2015 | Slide 6 Design IssuesHSE Grid Code Security of Supply Availability Harsh and unforgiving offshore environment Offshore Installation Access management COST I n t e r f a c e m a n a g e m e n t Fault Currents Harmonics Flicker Resonances Heat dissipation Fire Fighting Planning permits Physical size and weight Reactive Power support Fault Ride Through Condition Monitoring Intruders B i r d f o u l Emergency Power Emergency Evacuation Transport Boat Landing Navigational aids BIL Corrosion Protection Protection coordination Fault Management Replacement of spare parts O&M

7. © ABB Group May 1, 2015 | Slide 7 Requirements Examples Design Losses Certification InstallationLife Time Platform DesignSystem / Electrical Design Employer Authorities Grid Code O&M Norms & Standard Accessibility Reliability Availability Communi cation HSE Norms & Standard

8. © ABB Group May 1, 2015 | Slide 8 System Design Overall System Configuration Power rating Redundancy Cable route Seabed conditions Onshore connection No of HV Cables Busbar Design Cable Design Transformer Design Water Depth Fault levels

9. © ABB Group May 1, 2015 | Slide 9 System Design Grid Code – Power Quality  Harmonic Requirements  Harmonic emission  Background emission onshore grid  WTG:s  System resonance Harmonic Filter Design  Type of filter, S-filter, C-filter, etc.  Resistor for increased damping  Resistor => Losses => Heating => Forced Ventilation

10. © ABB Group May 1, 2015 | Slide 10 System Design Grid Code – Reactive Power Design  Static Reactive Power req.  Dynamic response req.  Cable Design  Transformer Design  WTG Capabilities  Shunt banks + WTG:s  Small SVC + WTG:s  Full rated SVC  Statcom  Hybrid solutions

11. © ABB Group May 1, 2015 | Slide 11 Platform Design Considerations  Overall Dimension  Interface  Transport and Installation  Environmental provisions  Diesel generator duty  HSE  Access management Systems  Environmental withstand

12. © ABB Group May 1, 2015 | Slide 12 Take away  Electrical Design - Open design to allow for connection of different WTG technologies  Reactive Power – Compensate locally for optimal design  Platform Design – Learn from Oil & Gas, adapt relevant requirements  Respect HSE

13. © ABB Group May 1, 2015 | Slide 13