High-Voltage Direct-Driven Wind Turbine Generating System
Research Project, 2020 –

This activity has the long-term aim to achieve a generating system for very large wind turbines, in particular sea-based ones, outputting a high voltage. The focus is to output DC, but AC-connection is also possible. The targets are high efficiency, low environmental and ethical impact as well as robustness. Also weight is an important target, where the elimination of a transformer is a very positive aspects, however, direct-driven designs seems to inevitable have
a higher weight compared to geared-solutions. In the long term, in-slot cooling is thought to be used, which might give a possibility of reaching a weight comparable to a geared-solution, however, this remains to be proved at a later stage. Furthermore, a single gear-step is also to be considered at a later stage. The objective of this project is to design a 20 MW wind generating system, feeding out power into a 40-70 kV DC system. The system shall be directly driven, i.e. gearless. A permanent magnet design is to be compared with a design using electrical magnetization. The suitable number of poles is to be established in relation to size and efficiency.


Torbjörn Thiringer (contact)

Chalmers, Electrical Engineering, Electric Power Engineering

Michela Diana

Chalmers, Electrical Engineering, Electric Power Engineering



Funding Chalmers participation during 2020–

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