Successfully reported this slideshow.
You’ve unlocked unlimited downloads on SlideShare!
An Integrated System Design to
Lower Cost of OSW Energy
Deployment in the Mid-Atlantic
University of Delaware
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 (email@example.com)
• Port Assembly and Vessel
Design Cost Elements
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
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.
• 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
– Following is for tripod suction bucket
Design Decisions: Foundation
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
Transport vessel arrives clamping the
turbine tower and at two points of the
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.
Transport uses rig on tower and
rigid sea mount above buckets to
stabilize during transport to site.
Vessel arrives at installation site and
uses crane to lower the turbine to
Suction buckets are placed on the seabed,
and smaller support vessel begins
running suction pumps; then transport
vessel returns to pick up another turbine
• “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