This review article aims to provide an overview and insight into the most relevant aspects of wind energy development and current state-of-the-art. The industry is in a very mature stage, so it seems to be the right time to take stock of the relevant areas of wind energy use for power generation. For this review, the authors considered the essential aspects of the development of wind energy technology: research, modeling, and prediction of wind speed as an energy source, the technology development of the plants divided into the mechanical and electrical systems and the plant control, and finally the optimal plant operation including the maintenance strategies. The focus is on the development in Europe, with a partial focus on Germany. The authors are employees of the Fraunhofer Institutes, Institute for Energy Economics and Energy Systems Technology and Institute for Wind Energy Systems, who have contributed to the development of this technology for decades.
This paper describes the design process of a 10 MW permanent magnet synchronous generator for wind turbine application. In order to achieve a high power output combined with a relatively low weight, a ring structure is chosen for the generator, with the generator’s length being less than 1/30 of the diameter. To reduce weight further, a tooth-wound coil winding is chosen for the generator. The electromagnetic layout, the power electronics concept, and the structural design of this new ring generator are presented in this paper, as well as the resulting generator design
A study of permanent magnet synchronous generator, constructed as a ring-generator, is presented in this paper. With this approach a milestone in reducing weight of wind turbines in high power applications like 10 MW generators can be reached. As proof-of-concept a scaled generator with a rated power of 200 kVA will be realized in a test bench. A distributed control and an active damping of axial mechanical vibrations approach is done. In order to achieve axial damping, the generator is divided in several electrical segments
This paper presents the design and control structure of a synchronous generator in ring form. The analysed generator is designed in order to test the control structure of a light-weight 10 MW generator for wind turbines. A segmented stator structure with distributed control allows control of the current of single stator segments which facilitates damping of axial displacement due to varying wind speeds by controlling axial forces. The layout process of the generator, its distributed control and the damping control are presented in this paper
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