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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
• Senergy Global Pvt. Ltd.

Speaker Profiles

Michael Splett

Presentation Type: Poster



Address: University of Paderborn Chair of Sustainable Energy Concepts Pohlweg 55 33098 Paderborn Germany
Phone: +49 (0)5251 60-
Fax: +49 (0)5251 60-
Email-ID: Splett@nek.upb.de
Organization: Chair of Sustainable Energy Concepts
Designation: Dipl.-Wirt.-Ing.
Country: Germany

Paper Title: Reliable and Cost-effective Design for an Offshore Metmast

Abstract of the paper

In order to comply with the German Federal Government’s major aims concerning the extension of regenerative energies in Germany the development of offshore wind plants will be indispensable. For offshore construction costs are extremely high though, which is due to the limited accessibility of the locations, large distances to the coast or to the next port and the extremely expensive logistics, almost all potential wind plant operators rely on bank credits. To moderate the financial risk for creditors it is reasonable and often imperative to carry out on-site measuring.

Such measurings have to meet high standards: ▪ The distance to the coast is more than 20 km (12.43 miles). ▪ The water depth is between 20 m (21.87 yd) and 40 m (43.74 yd). ▪ The measuring platform has to work almost completely autarkically because frequent maintenance would extremely force up costs. This also includes eco-friendly energy supply with a backup system. It would be reasonable to carry out both oceanographic and meteorological measurings. A high availability of data is considered indispensable. Long test runnings will often be too time consuming. The costs must not exceed a certain amount.

Consequently measurement technology and energy supply have to comply with particular requirements: The measuring instruments must ensure reliability. For there is no frequent possibility to compare the measurements with neighbouring measurements the choice of measuring instruments should guarantee diverse but proven measurement technology application (diversification). A further important aspect is redundancy. Due to the rough conditions offshore and the inaccessibility of the platform on account of the weather for long periods of time, the most essential measuring instruments must be redundantly available. In order to meet these requirements at least two different measurement procedures (cup anemometer and ultrasonic anemometer) should be applied. The measuring levels should be installed approximately every 10 m (10.94 yd), if possible and include at least the capture of wind speed and wind direction. In order to ensure a high availability of data the measuring equipment should be provided with a heating system. Particularly at offshore locations it is imperative to take into special consideration the lightning protection. The oceanographic measurings can be conducted by means of two measuring instruments. The measuring of the water temperature can be carried out by means of a measuring instrument of the type Pt100 which is resistant to sea water. The measuring of the wave parameters ought to be performed by means of an ADCP (Acoustic Doppler Current Profiler) with pressure registration. The ADCP should be installed at least a few 10 m (10.94 yd) away from the metmast in order to exclude influences of the metmast. When collocating the ADCP at seabed the possibility of scour formation has to be taken into account. The data transfer will be performed via digital short wave for economic reasons. Satellite transmission could serve as a redundant system. For economic reasons a micro-wave link is commonly not recommended.

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