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Brian Polagye - University of Washingtondepts.washington.edu/pmec/docs/20140122_PolagyeB_pres... ·...
Transcript of Brian Polagye - University of Washingtondepts.washington.edu/pmec/docs/20140122_PolagyeB_pres... ·...
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Marine Renewable Energy and the Environment: Progress and Challenges
Brian PolagyeAssistant Professor
Department of Mechanical EngineeringUniversity of Washington
Northwest National Marine Renewable Energy Center
IGERT Program on Ocean ChangeJanuary 22, 2014
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Motivation
Increasing concern over impacts of climate change, particularly on ocean ecosystems
Part of the solution is transitioning to low‐carbon sources of power generation
The oceans are a potential source of sustainable power
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Offshore Wind Energy
Principle Power WindFloat(2 MW demonstration platform)
Statoil Hywind(2 MW demonstration platform)
Horns Rev(160 MW Array)
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Tidal Current Energy
Andritz Hydro/Hammerfest (1.0 MW)
Ocean Renewable Power Company (0.2 MW)
Siemens/MCT SeaGen (1.2 MW)
Alstom/Tidal General Limited (1.0 MW)
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Wave Energy
Pelamis (0.8 MW)
Wave Dragon (4.0 MW)
Wello Oy Penguin (0.5 MW)
Aquamarine Oyster (0.8 MW)
Columbia Power Technology (< 0.1 MW)
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Power Generation Landscape The United States has more than 107,000 MW of coal‐fired generation capacity. Natural gas has a similar capacity and is expanding rapidly.
The United States has more than 60,000 MW of terrestrial wind generation capacity (13,200 MW added in 2012)
The United States currently has about 0 MW of installed marine renewable generation capacity
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Global Economic Challenge: Shale Gas
Hydraulic fracturing site in Bradford County, PennSource: Appalachian Voices
Can marine renewable energy compete with electricity generation
from shale gas?
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Marine Energy Economics
Generation Technology Current Long Term
Projection
Combined Cycle Natural Gas 40‐80 $/MWh ?
Offshore Wind (deep water) 100‐300 $/MWh 60‐100 $/MWh
Tidal Current 300‐400 $/MWh 50‐150 $/MWh
Wave 400‐500 $/MWh 50‐100 $/MWh
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Global Technical Challenge: Proving System Reliability
1 MW Alstom turbine mobilization (Orkney, UK)
Can we prove that a turbine can reliably produce power over N years in much less
than N years?
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Tidal Energy: Engineering Approaches
Lower EfficiencyMechanical Simplicity
Higher EfficiencyMechanical Complexity
DCNS/OpenHydro (1.0 MW)
Siemens/MCT (1.2 MW)
Design Philosophy Spectrum
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Global Social Challenge: Non‐exclusionary Use of the Ocean
Can marine renewable energy complement existing uses of the ocean or enable
new uses?
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Societal Influences
w/ Kiki Jenkins and Nicole Faghin
Opportunity for society to help shape the evolution of marine energy technology
Outreach is critically important – In the absence of information society draws its own conclusions.
“Sustainability of Tidal Energy”
— Integrated engineering, environmental and societal considerations
— NSF Sustainable Energy Pathway
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Global Environmental Challenge: “Retiring Risk”
Can we prove whether or not a marine renewable energy development will have environmental
impacts over in N years of operation in much less
than N years?
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First Question – What are we studying?An alteration to the environment by installation, operation, or maintenance of a marine renewable energy convreter
A detectable or measurable alteration
A change threshold denoting biological importance – specific to site and project scale
Negative effect Positive effect
Stressor
Change
Effect
Impact Benefit
w/ John Horne at the NSF Workshop: Research at the Interface of Marine/Hydrokinetic Energy and the Environment, October 6, 2011
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Second Question – Why should we study?
Satisfy Regulatory Requirements
Identify Commercial‐Scale Impacts
Pre‐empt Impacts by Design
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Third Question – What are the pathways?
Source: Simon Geerloffs, Pacific Northwest National Laboratory
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Fourth Question – What are the priorities?
Device presen
ce:
Static effe
cts
Device presen
ce:
Dynam
ic effe
cts
Chem
ical effe
cts
Acou
stic effe
cts
Electrom
agne
tic
effects
Energy re
moval
Cumulative effects
Physical environment:Near‐fieldPhysical environment:Far‐field
Habitat
Invertebrates
Fish: Migratory
Fish: Resident
Marine mammals
Seabirds
Ecosystem interactions
Polagye, B., B. Van Cleve, A. Copping, and K. Kirkendall (eds), (2011) Environmental effects of tidal energy development.
Potential Significance
Low
Moderate
High
Scientific Uncertainty
Low Moderate High
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“The Lesson from Strangford Lough”
3m diameter
Rotor (2 x 16m diameter, 1.2 MW rating)
Gearbox/Generator
Support pile
Support “wing”
Service platform and electronics
Monitor Changes or Mitigate Risks?
Siemens/Marine Current Turbines SeaGen
Northern Ireland
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SeaGen installed and commissioned in 2008
Risk factors for impacts to harbor seals— Activity in the Lough – foraging and
transits to Irish Sea— Scale of project— Risk for injury (tip velocity,
mechanism for tip contact)
Post‐installation blade strike mitigation: “Shut down turbine when harbor seals within Xm.” — Problem 1: How do you tell when a harbor seal is X m
away from the turbine?— Problem 2: What information does this give
us about the actual risks to harbor seals?
Strangford Lough Experience
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Progress on High‐Priority Concerns
Since 2010 – multiple commercial demonstrations of wave and tidal technology in US and Europe, most with substantial monitoring programs
Key Outcomes
— Fish mortality for tidal turbines is infrequent (none observed to date)
— Marine energy converters produce sound
— Subsea structures are colonized by marine life
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Environmental Monitoring Paradox
w/ Andrea Copping: Instrumentation for Monitoring around Marine Renewable Energy Converters
At existing proportion of total project cost, environmental monitoring is economically crippling to industry
If early commercial projects cause environmental harm, the industry may also be crippled
How do we avoid impacts without incurring high costs?
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Challenge: “Retiring Risk”
Often, the objective of monitoring is to collect information that improves certainty in evaluating environmental risk (frequency x outcome)
Ideally, over time:
— Significant risks can be recognized and mitigated through changes to converter design or operation
— Insignificant risks can be selectively “retired” from monitoring programs
For high‐priority risks, no agreed upon framework for reaching either of these end states
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Challenge: “Data Mortgages”
Often, risks of greatest concern are serious outcomes with low probabilities of occurrence
Spatial comprehensive and temporally continuousmonitoring of converters requires the least time to resolve risk – “collect everything”
Data bandwidth for “brute force” approaches to this is problematic – “data mortgages”
Stereo‐optical Cameras (2 Mpx
@ 10 fps)X 80 MB/s X 3 months
observations = 600 TB of storage
Example: Continuous stereo‐optical monitoring for a single system. Comprehensive monitoring would require multiple systems.
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Options to Retire Risk without Mortgages
Instruments that intrinsically produce information
— Example: recording and transponding tags
— Tend to be expensive to deploy in large numbers
Automated processing that mines data for information
— Example: split‐beam echosounders
— Requires ability to “trash” raw data
Is it reasonable to expect a “silver bullet” software solution for all instruments?
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A Better Alternative? Integrated Packages Intermediate option to pure hardware or
software solutions
Passive Acoustic Detection Processing in near
real‐time Omni‐directional
coverage at ranges on the order of 1 km
MEC
Split‐beam Echosounder Processing in near
real‐time Tracking capability at
ranges beyond 100 m
Optical Camera Requires archival
processing Short range and
limited field of view
Example: Detect, track, and identify a marine mammal
approaching a MEC
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Adaptable Monitoring Package (AMP)
w/ Andy Stewart, James Joslin, Ben Rush, Paul Gibbs,…
Stereo‐Optical Cameras
Doppler current profiler
Strobe illuminator
“Smart” hydrophone
Doppler velocimeter
Imaging sonar
Cetacean click detector
And more…
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Data and Power Needs
0
20
40
60
80
100
Doppler Profiler
(1 Hz Sampling)
Stereo‐Optical(2 Mpx @ 10 fps)
Imaging Sonar(15 fps)
Acoustic Array
(4 elements @ 400 kHz)
Data Ba
ndwidth (M
B/s)
1x10‐5
Need a cabled connection to shore…
…but so does the marine energy converter.
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Integration with Marine Energy Converter
OpenHydroOpen Centre turbine (6 m diameter)
AMP
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Deployment and Recovery System
Docking Station Power and fiber
wet‐mate
AMP
SAAB SeaEyeFalcon
Custom skidw/ SeaView Systems
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AMP Deployment Approach
At‐sea flight tests starting by fall 2014…
AMP and “Millennium” Falcon
Launch Platform
Umbilical
Current Direction
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Conclusions
Marine renewable energy must overcome significant challenges, but has significant potential
Progress requires a coupled engineering, environmental, societal, and economic approach to problem solving
Broad collaboration between researchers (multi‐disciplinary), industry, regulators, and public required
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AcknowledgementsThis material is based upon work
supported by the Department of Energy
DOE Environmental Webinar series starts tomorrow morning – Monitoring Instrumentation
This material is based upon work supported by the National Science
Foundation (NSF 1230426)
This material is based upon work supported by Snohomish PUD