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• Ministry of Non-conventional Energy Sources, Government of India, New Delhi
• Ministry of External Affairs, Government of India, New Delhi
• Ministry of Environment and Forests, Government of India, New Delhi
• Government of Madhya Pradesh, Bhopal
• Indian Wind Power Association, Chennai
• Centre for Wind Energy Technology, Chennai
• Indian Renewable Energy Development Agency, New Delhi
• India Energy Forum, New Delhi
• Assocham, New Delhi
• PHD Chamber of Commerce and Industry, New Delhi
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Speaker Profiles

Werner Petruschke

Presentation Type: Oral



Address: Langemarckstrasse 20 D-45141 Essen
Phone: ++49 201 825231
Fax: ++49 201 825265
Email-ID: wpetruschke@tuev-nord.de
Organization: TUV Nord
Designation: Projectmanager Wind Turbines
Country: Germany

Paper Title: The impact of turbulence intensities for site class studies and layout of wind farms

Abstract of the paper

Abstract for the 5th World Wind Energy Conference 2006, New Delhi (WWEC-2006) (Deadline: May, 31st 2006) WWEC Subject: Planning, implementation and logistics of wind farms Title: The impact of turbulence intensities for site class studies and layout of wind farms Authors: Thomas Hahm, Steffen Wussow TUV NORD SysTec GmbH & Co. KG Grosse Bahnstrasse 31, 22525 Hamburg, Germany Contact: thahm@tuev-nord.de, Phone: ++49-40-8557-2193, Fax: ++49-40-8557-19010339 Abstract: Wind turbines are subject to environmental conditions which may affect their loading, durability and operation. To ensure the appropriate level of safety and reliability the environmental parameters have to be taken into account during wind farm layout. The international standards define Wind Turbine Classes in terms of mean wind speed and turbulence intensity. These are the dominating design parameter for fatigue loads of the wind turbines and it is the aim of a site class study to ensure that the site specific conditions are less severe. While the mean wind speed within a wind farm will in general be lowered the turbulence intensity will increase and may be a limiting factor in wind farm layout, especially at narrow spacing or in areas with high ambient turbulence intensity. This article will start with an overview over the different steps to judge turbulent wind conditions in wind farms starting from empirical methods to determine effective turbulence intensities as implemented in the standards to detailed site specific load calculations. Theoretic background, advantages, drawbacks and specific problems of the different methods will be pointed out. After a short introduction to atmospheric turbulence the problems and methods of evaluating ambient turbulence intensities will be addressed. The article will end with an introduction to the current research projects of TUV NORD SysTec using advanced Computational Fluid Dynamic (CFD) simulations to understand the turbulent structure of wind turbine wakes and to improve fatigue load prediction within wind farms in the future. The TUV NORD Group as one of the major German accredited certification bodies for wind turbines and its worldwide subsidiaries with more than 7.000 employees worldwide offer the complete services in the field of wind energy.

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