Offshore Wind ppt

8/12/2019 Offshore Wind ppt

1/18

Offshore Wind

Geoff Sharples

[email protected]


2/18

Frequently Unanswered Questions

Why dont they build more offshore wind?

Why not make the blades bigger?

How big will turbines get?


3/18

Offshore Resource is Good


4/18


5/18

Current commercial turbines stand in less

than 30m of water huddled at 20x20


6/18

Wind ventures further offshore

Source: EWEA Oceans of Opportunity 2009

Confidential

Interactive map at http://www.4coffshore.com/offshorewind/

To a shore based observer a 90m nacelle is below the horizon at 35 km

To a shore based observer a wind farm appears as white stripe at 20km
http://www.4coffshore.com/offshorewind/http://www.4coffshore.com/offshorewind/http://www.4coffshore.com/offshorewind/http://www.4coffshore.com/offshorewind/


7/18

Power Prices Higher in Coastal States

Cape Wind PPA at 18 c/kWh


8/18

The cycle of non-innovation

Offshore

turbines

today :

Modified

onshoreturbines

Confined

to

shallow

water

Incumbents:

understand the

technical issues

Have a vested

interest in existing

supply chains and

facilities.

Incumbents fund

evolutionary design

Developer

tech risk

averseUtilities

are risk

averse

Human

customers

demand

cheap

reliable

power

Offshore

wind:

Close to

load

Far from

view

Large

Resource

but

Entrepreneurs

cant fund

revolutionary

prototypes

Because

Project

Financiers

are risk

averse

Capital intensity curtails innovation

BecauseBecause


9/18

Cost of energy

COE = (DR+IWF) x ICC + LRC + O&M

AEPnet

Where: COE = LevelizedCost of Energy ($/kWh) (constant dollars)

DR = Discount Rate (1/yr) = RISK Large ImpactIWF = Insurance, Warranty and Fees (1/yr)

ICC = Initial Installed Capital Cost ($) = TURCC+ BOSCC

TURCC = Turbine Capital Cost ($) SomeImpact

BOSCC= Balance of System Capital Cost ($) Small?Impact

LRC = LevelizedReplacement/Overhaul Cost ($/yr) Med ImpactO&M = LevelizedO&M Cost ($/yr) Med Impact

AEPnet =Net Annual Energy Production (kWh/yr) LargeImpact


10/18

Physical Constraints

Swept Area R^2

U = wind speedair density

Mechanical conversion efficiency

Rotor Power Coefficient

conversion wind to mechanical

(subject to Betz limit)


11/18

Design Objectives

Reduce Risk

Increase energy capture

Get to better resource Reduce operations cost

Increase turbine capacity


12/18

Design Areas

Blades

Towers

Generators


13/18


14/18

Rethink old ideas


15/18

Transitional Technology Status Quo


16/18

Floating Structures Status Quo


17/18

Frequently Unanswered Questions

Why dont they build more offshore wind?

Why not make the blades bigger?

How big will turbines get?


18/18

FIN

Thank You

Offshore Wind ppt

Documents

Transcript of Offshore Wind ppt