By L. H. Hansen, L. Helle, F. Blaabjerg, E. Ritchie, S. Munk-Nielsen, H. Bindner, P. Srensen and B. Bak-Jensen
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Additional info for Conceptual survey of generators and power electronics for wind turbines Adgangsmade: Internet
This means that analytical analysis of the magnetic circuit is difficult. Therefore, numerical methods are attractive. A well-known and documented method is the Finite Element Method (FEM), where the problem is defined inside a boundary and solved by division into small segments with knowledge of the surrounding boundary conditions. Risø-R-1205(EN) 43 Figure 24. Sketch of the flux path in a transverse flux design. Source (Henneberger & Bork, 1997). FEM calculations may be used to determine the steady state performance of the non-linear TFPM machine magnetic circuit.
At the same time it is important in large scale generators to have the possibility to easily repair broken/destroyed magnets. Otherwise repair cost can be too high. 4 The Switched Reluctance Generator The Switched Reluctance Generator has in the last decades been considered for Wind Power applications, but much of the available literature is focussed on aircraft generators. However, the two applications should have similar requirements, the main differences being a matter of scale. The rotor construction is particularly robust, being without windings.
8 pole, salient pole rotor, fitted with brushless exciter and damper winding. 2 Operation To operate as a wind turbine generator, it will be preferable to feed the power through a power electronics converter, carrying the full output power. The system will act as storage for the power fluctuations, which are inevitable with a synchronous generator, driven by an inherently gusting wind. It will also buffer transients coming from the net side, and enable variable speed operation of the wind turbine.