Wind Energy

© B. Welker

The use of wind energy for the generation of electricity in Germany has boomed since the early 1990s. Power generation from wind energy has increased by almost eight times in the last five years (1997 - 2002) and now meets around 3 % of electricity requirements.


This is in part thanks to dedicated specialists, who have provided proof of the successful utilisation of wind energy in pilot projects, but also to the state subsidy programmes. Particular significance is held by the Electricity Feed Act which came into force in January 1991, and which contained an obligation for the utility companies to purchase electricity gained using regenerative technologies. It was replaced in 2000 by the Renewable Energy Sources Act (EEG).
In this general setting, together with technical developments in wind farms and continuous increases in their size, the production of wind farms has developed into an independent branch of industry in Germany.
As this country is running short of potential locations for wind farms, future developments focus on the one hand on the replacement of small plants by larger ones, which are better able to exploit the potential of the existing locations, and on the other in the development of offshore wind farms. In the long term, offshore wind parks should increase the contribution of electricity generated by wind to the total electricity required in Germany to 25 %.


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Facilities consisting of a photovoltaic system, a wind generator, a weather station, a METEOSAT system, and a link with the already existing woodchip furnace and thermal solar system for the purpose of complex data acquisition and computer-supported analyses. Creating the corner stones for scientific pretests of work of groups of students, projects, and working groups, as well as the demonstration of the effectiveness of the system to utilize regenerative energies by publishing the results (detail information in German).
A new oscillation-insulating concept for structure-borne noise has been introduced. Conversion was achieved with load-bearing interfaces. Compared with passive bearing elements, the active interfaces feature a better insulation behavior for structure-borne noise within the range of 200 to 1000 Hz. A constructive integration of the interfaces into the bearing of a gear of a wind-driven power station is possible but does require a detailed design and construction of the gearbox bearing for conversion to take place. Bearings for devices with lower loads can utilize the new structure-borne noise insulating bearing elements with relatively little construction expenditure (detail information in German).
The goal of the project "Germanic Lloyd Wind Energy GmbH" is to develop an extended service strength proof for the life span prognosis of wind energy plant components. Due to this new economical procedure the potentials to increase of the plant safety and the cost optimization by lightweight construction can be utilized better. The project is promoted with Federal Funds by the agency responsible for the project Jülich PTJ.
A concept for the innovative and resource-saving pool center based on the Least-Cost-Planning technique was developed. It also contained a service component for the continuing maintenance and running of the pool which proved to be financially advantageous compared to a municipally managed entity. Not only the use of the most up-to-date technology but also an early harmonisation and optimisation of the complete energy concept led to significant savings in resources. The demand for fresh water is 25 percent below that of a comparative pool using conventional technology. The consumption of primary energy was reduced by even 35 percent (further information in German). Expand…
Measurements with calculation results of a numerical modeling were taken within the scope of the wind power measurement program of Saxony. Modeling was carried out large-scale with a spatial resolution of 5 x 5 km grids and small-scale with a 1.5 x 1.5 km grid. A method to determine the size of the capacity effect was further developed and utilized as well. The achievable accuracies of the annual average value of the wind velocity exceed the required threshold value of 0.2 m/s so that the numeric modeling for the utilization of wind power cannot yet be used (detail information in German).
In the present project, technical equipment and components were fitted with intelligent sensor networks with the objective of monitoring the integrity of technical structures. The researchers combined these networks in a condition monitoring system (CMS). The system was implemented on a pilot basis in the areas of energy technology, aviation and plant technology to demonstrate its performance capabilities. Expand…
The research team conducted field trials for testing the sensor and signal processing technology employed by the condition monitoring system (CMS). The CMS had already been developed for monitoring the integrity of technical systems under close to actual conditions. Wind turbine rotor blades as well as piping systems were tested so as to optimize the sensor and signal processing technology. Expand…
Identification of possible points of impact at rotor blades with a 1.2 MV surge voltage generator.
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Lightning damage at wind energy plants leads to high repair costs as well as down-times. Therefore, the lightning protection of rotor blades and further equipment components is standard with modern plants. In this project information the „BINE news service" informs about the results of a research project of the Development Fund Wind Energy and the University of the German Federal Armed Forces Munich to improve lightning protection systems at wind energy plants.
The "Enercon GmbH” works on a project to develop and build a wind turbine prototype with a 122 m diameter rotor blade, a hub height of about 130 m and a nominal capacity of about 4 MW. Within the scope of the project stands the evaluation of the manufacturing, transportation, installation and operation process in terms of technical and financial aspects. The project receives federal funding through PTJ - the Project Management Organisation Jülich.
The aim of the project initiated by the Institut für solare Energieversorgungstechnik (ISET, Institute for Solar Power Technology) is to create and extend the basic systems-specific principles for the development of modular power supply systems which are supplied through photovoltaics and other energy converters. The modularisation of these power supply systems would make it possible to improve economic efficiency and at the same time increase safety. The project is being subsidised with government funds provided by the project management organisation Jülich.
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