Transcript Field-test of nacelle-based lidar to explore its applications for Vattenfall as wind park operator Monday, 18 May 2015 Stefan Goossens Challenge the future Introduction Challenge the.

Field-test of nacelle-based lidar to explore its applications
for Vattenfall as wind park operator
Monday, 18 May 2015
Stefan Goossens
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Introduction
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Applications
1. Power curve
2. Yaw misalignment
3. Blockage effect
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Content
Measurement campaign
Working principle
Experience
(Research
Validation
1. Power curve
(Research
2. Yaw misalignment
(Research
3. Blockage effect
(Research
Financial feasibility
(Research
Conclusions and Recommendations
Questions
objective I)
objective
objective
objective
objective
II)
III)
IV)
V)
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Measurement campaign
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Slufterdam West
Wind Iris installed 18 September 2014
Sodar installed 13 October 2014
Campaign length: 3 months
Photo: Havenbedrijf Rotterdam N.V., Projectorganisatie Maasvlakte 2
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Working principle
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Experience
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Installation ~8 hours by 4 technicians, no major issues
Easy access to data; good availability (90%)
Data processing relatively straightforward
Good support during the campaign from Oldbaum
Plenty of literature and guidelines for comparison and
verification
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Validation
Comparison to on-site sodar
• Wind Iris is able to measure 10-min wind
speed accurately: good correlation, in
accordance with literature
• Turbulence intensity questionable
• YM measurement less accurate than
anticipated: 4°vs 0.5°
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1. Power curve
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Wind speed at hub height and 2.5D
Power measurement requires more certainty to be IEC compliant
Density correction
Shear & Veer
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2. Yaw misalignment
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2. Yaw misalignment
What is the ideal yaw misalignment when it comes to the power curve?
A small angle (~5 degrees)
As close to zero as possible
90 degrees
?
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2. Yaw misalignment
• Mean yaw misalignment: 1.5 degrees
• 0 degrees yaw misalignment not necessarily best?
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2. Yaw misalignment
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2. Yaw misalignment
What is the ideal yaw misalignment when it comes to the power curve?
A small angle (~5 degrees)
As close to zero as possible
90 degrees
?
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3. Blockage effect
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3. Blockage effect
Good fit with theory (average and filtered)
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Financial feasibility
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Financial feasibility
• Strongest drivers of ROI:
• Purchase costs
• PV improvement factor
• Break even point (ROI 0%) for PV improvement of 1.2%
• Implementation not recommended due to uncertainty in PV
improvement
• Financially attractive if power curve improvement can be
quantified
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Conclusions
• Wind Iris advantages:
• Power curve measurement
• R&D applications (e.g. blockage)
• Wind Iris disadvantages:
• Yaw misalignment measurement less accurate than anticipated
• No density, shear and veer measurements (yet)
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Recommendations
• Use Wind Iris for PV measurement, R&D and if large yaw
misalignment is suspected
• More research to investigate effect of yaw misalignment on the PV
curve (e.g. intentional YM)
• Implementation recommended if PV improvement can be quantified
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The future
• Power curve measurement
• Feed-forward control
• R&D
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Questions
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Research objectives
I.
Gain experience with the installation and operation of the Avent Wind Iris,
as well as the collection and analysis of the data, considering that a good
dataset is a prerequisite for further analysis.
II. Determine the power curve based on lidar.
III. Determine how much Slufterdam West 09 and the park can gain from the
installation of a nacelle-based lidar.
a.
(Rotor speed dependent) wind vane calibration.
b.
Determine if other turbines in the park can benefit from the installation of one nacelle-based lidar.
c.
Match yaw misalignment angle, power and wind speed to estimate the power loss due to yaw misalignment.
IV. Estimate the blockage effect/compression zone in front of the turbine and
compare to models.
V. Determine under what conditions a nacelle-based lidar is financially feasible.
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Power and yaw misalignment
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Yaw misalignment and RPM/V
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