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AWEA.Offshore-2014-Kempton-Final_2014.10.3

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AWEA.Offshore-2014-Kempton-Final_2014.10.3

  1. 1. An Integrated System Design to Lower Cost of OSW Energy Deployment in the Mid-Atlantic Willett Kempton University of Delaware willett@udel.edu 302-831-0049
  2. 2. Goal of Project Develop an integrated system design for an offshore wind farm in order primarily to reduce the cost of energy and secondarily to shorten deployment timeline of offshore wind energy. Project Sponsor: US Department of Energy, award DE-EE0005484 Principal Investigator: Willett Kempton Project Managers: Andrew Levitt (Former), Richard Bowers (rpbowers@udel.edu)
  3. 3. Pick-up Transport Installation Suction Bucket Deployment Integrated Design
  4. 4. Characteristics of Study Area
  5. 5. Turbine, 38% Foundation, 25% Installation, 22% Electrical, 13% Development, 2% • Turbine • Foundation • Port Assembly and Vessel • Transmission Design Cost Elements
  6. 6. Design Decisions: Turbine • Choice of 10 MW turbine with 150m rotor • Fewer machines per MW (fewer turbines, foundations, installations, maintenance trips) • Turbines not designed for transport with blades on. Install blades offshore
  7. 7. Design Decisions: Foundation • Foundation driven not by static loads but by dynamic loads (waves and rotor movement). Designs focus on stiffness. • Fabrication labor roughly 4x-8x the cost of the steel commodity. • Lattice can withstand larger wave loading. • Use lattice for lower section of vertical support: lattice is stable; allows for multiple seabed fastening points.
  8. 8. • Design Alternative 1: Piled – Jacket structure with piles – Multi-step offshore assembly – Jack-up vessel • Design Alternative 2: Suction Bucket – Turbines assembled in quay on jacket structure with suction buckets – Deployment in a single offshore step via stiffleg crane barge – EACH HAS MAJOR VESSEL, PORT, AND INSTALLATION IMPLICATIONS – Following is for tripod suction bucket Design Decisions: Foundation
  9. 9. Photo courtesy of DONG Energy: https://www.youtube.com/watch?v=w9Qz1PiG1Y8#t=12 Suction buckets placed in water beside quay; Jacket lifted onto structure; Workers attach jacket to suction buckets Entire turbine structure put on foundation Foundation Construction with Crane
  10. 10. Transport vessel arrives clamping the turbine tower and at two points of the lattice structure. Pick-Up
  11. 11. Lower supports prevents the turbine from moving inward towards the vessel during transport, reducing the risk of unnecessary forces on the turbine and foundation structure. Sea Mounting
  12. 12. Transport uses rig on tower and rigid sea mount above buckets to stabilize during transport to site. Transport
  13. 13. Vessel arrives at installation site and uses crane to lower the turbine to the bottom. Suction buckets are placed on the seabed, and smaller support vessel begins running suction pumps; then transport vessel returns to pick up another turbine Installation
  14. 14. • “Integrated Design” was achieved by a series of meetings with all design teams, challenging each how they can modify costly components • Result of design work: Simultaneously changed seabed mounting, along with assembly (more Quayside), different vessel and deployment changes • Bigger rotor/generator yields large cost savings • Eliminate: Jack-up vessel; large component assembly at sea; pile driving; Reduce: large vessel time at sea • Further cost reductions enabled, but not given as main path forward • Not ready to do this in one step; requires demonstration to de-risk Conclusions

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