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A safe and easy solution for a complex problem
Load extrapolation
acc. to IEC 61400-1 Ed.3
Load
calculation
k
Extreme
value
extraction
k
Stochastic
modelling
k
Extrapolation
to 50 years
k
Load limits
Advantages
Conform to amendment of IEC 61400-1:2005, Ed. 3
Statistically secured results
Easy applicable
Realistic predictions of extreme loads
Stable solutions
Only few simulations needed to keep results
within a small bandwidth
Confidence level to fit results to the reliability
required or to comply with different safety factors
No expensive computer resource or data preparation
References
A. Heitmann, A. Binder, E. v. Collani, K. Al-Ghazali, W. Sans
Design Load Definition by LEXPOL
Wind Energy Vol. 11, No. 6, Nov.-Dec. 2008
http://www3.interscience.wiley.com/journal/121528239/issue
A.Heitmann, E. v. Collani, K. Al-Ghazali
Risk Assessment and Prediction of Maximum Loads for Wind Turbines.
EWEC, Brüssel 2008
A. Heitmann, E. v. Collani, K. Al-Ghazali, E. Böhme, T. Hahm
Experiences with a new probabilistic method fort he extrapolation of
extreme loads according to IEC 61400-1 Ed. 3: Wind Turbines – Part I.
EWEC, Mailand 2007
Reference project ENERCON
Load Assumptions Wind Turbine ENERCON E-126
TÜV NORD Group
Department Dynamic Systems
Wind Energy
Große Bahnstraße 31
22525 Hamburg
Germany
Tel.: +49 (0)40 8557-2417
Fax.: +49 (0)40 8557-2552
windenergy@tuev-nord.de
www.tuev-nord.de
In August 2005 a new Edition of the IEC, the IEC 61400-1
Edition 3, was published. Within this new edition load extrapolation, i.e. load predictions, is an issue of the design load
case DLC 1.1. Making predictions about future developments is difficult, because many different developments may
occur in more or less identical situations. Nevertheless,
anybody can make predictions and many different methods
have been developed. From divination and astrology, to the
deterministic natural laws of classical science and the probabilistic methods of the last century, the stochastic approach
has been developed, representing the actual state of the art.
TÜV NORD developed in collaboration with Stochastikon
GmbH, Würzburg, Germany, a stochastic approach, which
meets the requirements of the IEC Ed. 3 and the corresponding reliability of the stochastic prediction procedures can
be guaranteed in contrast to alternative procedures. The
approach is implemented in the software program LEXPOL.
Order your test version today!
Company profile
TÜV NORD in Wind Energy
TÜV NORD Group, with a workforce of more than 8,000, is
one of Germany's largest technical service providers. We
owe our leading market position to our technical competence and a wide range of consulting, testing and servicing
activities in the Systems, Mobility, Certification, Energy and
Systems Engineering, Academy and International Divisions.
Within the field of wind energy TÜV NORD is one of the
leading accredited certification bodies for wind turbines
world wide. We certify wind turbines according to all international certification guidelines like IEC, EN, GL, Danish approval scheme, DIBt and TAPS. Within the certification process
the design of the whole wind turbine is assessed including
the load assumptions, the safety concept and all components. The manufacturing evaluation including the quality
management system (ISO) is necessary for a type certification as well as different measurements within the Type
Testing. The certification can also be done for separate
components like gear boxes, rotor blades, generators, … .
The necessary gear box prototype test can be supported by
our gear box test stand at DMT.
Besides the type certification for turbine manufacturers all
services for wind farm projects can be offered from one
hand. Wind farm planners, operators or financers get the
whole spectrum of project related assessment services, like:
Due Diligences
project certifications
comparison of site conditions with certification of turbines
(e.g. acc. to IEC WT01)
assessments of resources/wind potential maps/
energy yield prognosis
soil assessments, foundation consultancy,
building surveillance
sound immission prognoses, shadow flicker analyses
turbulence reports
environmental impact studies
risk analyses
3-D flow calculations
compliance with local grid codes/LVFRT measurements
assessment of grid connection concepts
manufacturing inspections of components
or whole turbines
The combination of the type certification and site assessments are also a special service from TÜV NORD. Site
specific conditions have a big influence on the economic
efficiency and safety of wind turbines. Every special site with
either cold climate, hot climate, earthquake zones or special
flow conditions like on cliffs etc. can be displayed and
assessed with the possible result of a project certificate.
The operation of the turbines can be accompanied by
TÜV NORD with commissioning inspections, periodical
inspections, special inspections, such as condition-based
monitoring, non-destructive testing and damage analyses
to ensure performance, availability and safety.
TÜV NORD Group
Department Dynamic Systems · Wind Energy
Große Bahnstraße 31 · 22525 Hamburg · Germany
Tel.: +49 (0)40 8557-2417 · Fax.: +49 (0)40 8557-2552
windenergy@tuev-nord.de · www.tuev-nord.de
Lexpol EP 04.09 1000 dia
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