VERIFICATION OF POWER PERFORMANCE OF ACTIVE POWER CONTROL WIND TURBINES IN COMPLEX TERRAIN N' Stefan - PowerPoint PPT Presentation

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VERIFICATION OF POWER PERFORMANCE OF ACTIVE POWER CONTROL WIND TURBINES IN COMPLEX TERRAIN N' Stefan

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... according to ISO/IEC 17025 for wind turbine power performance measurements (and others). Numerous verifications of power curve in complex terrain sites have been ... – PowerPoint PPT presentation

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Title: VERIFICATION OF POWER PERFORMANCE OF ACTIVE POWER CONTROL WIND TURBINES IN COMPLEX TERRAIN N' Stefan


1
VERIFICATION OF POWER PERFORMANCE OF ACTIVE POWER
CONTROL WIND TURBINES IN COMPLEX TERRAINN.
Stefanatos, F. Mouzakis, E. Binopoulos, F.
Kokkalidis, P. Papadopoulos Centre for
Renewable Energy Sources (CRES) Wind Energy
DepartmentLaboratory for Wind Turbine Testing
(LWTT)
2
Verification of power performance in complex
terrain
Share the experience respect confidentiality
  • The Laboratory for Wind Turbine Testing (LWTT) of
    CRES is a Testing Laboratory accredited by DAP
    GmbH according to ISO/IEC 17025 for wind turbine
    power performance measurements (and others).
  • Numerous verifications of power curve in complex
    terrain sites have been successfully completed by
    CRES-LWTT
  • Valuable experience gathered, but is commercially
    confidential
  • Lets talk Confidential
  • No site names
  • No wind turbine types
  • Non-dimensional results

3
Method-Standards applied
Verification of power performance in complex
terrain
  • IEC 61400-121998
  • MEASNET Power Performance Procedure Ver. 3/2000
  • IEC 61400-12-12005
  • requirements regarding instrumentation properties
    and positioning fulfilled
  • Additional features
  • Shear profiles measured at reference mast and at
    wind turbine position

4
Verification of power performance in complex
terrain
Overview of Cases studied (no photos, sorry..)
  • CASE P1
  • Pitch controlled
  • Fairly complex (terrain inclination typical 10)
  • Only site calibration and shear results available
  • CASE P2
  • Pitch controlled
  • Semi-flat terrain (terrain inclination typical
    4)
  • Power curve measurement campaign complete

5
Verification of power performance in complex
terrain
Overview of Cases studied (no photos, sorry..)
  • - CASE P3
  • Pitch controlled
  • Very complex terrain (terrain inclination typical
    20 and higher)
  • Power curve measurement campaign complete
  • CASE S6
  • Stall controlled
  • Extreme complex terrain (terrain inclination
    typical 40)
  • Velocity ratios direction and velocity sensitive
  • Power curve measurement campaign complete
  • 5 STALL CONTROL CASES
  • Summary results from 5 older stall controlled
    cases also included

6
Verification of power performance in complex
terrain
Know your site (1) Velocity ratios
CASE P1 Fairly complex terrain case (10
inclination) Limited dependence of velocity
ratios to mean wind speed
CASE S6 Extreme complex terrain case (40
inclination) Strong dependence of velocity ratios
to mean wind speed
7
Know your site (2) Turbulence
Verification of power performance in complex
terrain
Mean Turbulence levels in complex terrain sites
may vary significantly (eg. from 7 to 20)
8
Know your site (3) Shear
Verification of power performance in complex
terrain
Shear ratio from 0.80 to 0.92
Inverse shear at w/t position for one case
9
Verification of power performance in complex
terrain
Results (1) The good, the perfect and
Case P2 Semi flat
Case P3 Very complex
Terrain inclination 4 Velocity ratio
1.01 ???P-0.45
Terrain inclination 20 Velocity ratio
1.17 ???P1.78
10
Verification of power performance in complex
terrain
Results (2) and the stall controlled
Case S6 Stall, extreme complex
  • Deviations
  • Velocity dependent site calibration factors
  • Working sector extended to NON-MEASNET complete
    direction bins to gain high wind speed bins
  • Warranted power curve not measured (optimised for
    site specific air density and wind speed annual
    distribution)

Terrain inclination up to 40 Velocity
ratio1.03 ???P - 10.9
11
Verification of power performance in complex
terrain
Verification of site calibration Case S6
-Extreme
Conventional site calibration
Velocity-dependent s.c
Direction sensitive power curve Verification
failed
No direction effect on power curve Verification
successful
12
Verification of power performance in complex
terrain
Results 3 Sensitivity analysis (or stall
control can be OK too)
Effect of mast base altitude height difference on
velocity ratio
Small AEP deviation regardless of the Velocity
ratio (for 5 stall cases also)
13
Verification of power performance in complex
terrain
Results 4 Sensitivity analysis (or stall
control can be OK too)
Turbulence intensity Limited effect
Mast distance No effect (within the IEC limits)
14
Verification of power performance in complex
terrain
Lets get dimensional again
  • Assume
  • 10 MW wind farm
  • 8 m/s Annual mean wind speed
  • kWh price 0.075 EUROs
  • 10 less AEP
  • Income lost per year 200 kEUROs
  • (many times the cost of a power curve
    verification campaign)

Terrain inclination up to 40 Velocity
ratio1.03 ???P - 10.9
15
Verification of power performance in complex
terrain
Conclusions
  • Wide variety of flow conditions in complex
    terrain not always bad
  • Current methods adequate to give reliable results
    even in difficult cases
  • Extreme cases do exist and require additional
    attention
  • Verification and cross-check procedures very
    important
  • A power curve verification campaign may prove to
    be
  • a very good investment
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