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 resources for Conceptual survey of generators and power electronics for wind turbines Adgangsmade: Internet
The excitation required to feed external faults adequately, so that protection equipment would operate as required. , 1999). In the case of the SRG, sufficient DC link current must be produced to enable fault clearance by tripping a relay or other fault protection device (Heglund & Jones, 1997). For the SRG tested, the load fault voltage collapsed to 35 V from around 270 V, the phase current was 1400 A, peak value, compared to full-load current of 900 A. , 1998) found that the 8/8, single phase SRG tested could continue generating in the presence of an internal fault.
This also removes the need for special starting and synchronising equipment for the PMG. The system may operate at any power angle, without losing synchronism. 6 Design Considerations Many authors promote a particular design of generator, where the basic version is possibly the cylindrical air-gap machine, with the stator on the outside and the rotor free to rotate inside it, see Figure 11. The basic magnet design must be NdFeB magnets, surface mounted, see Figure 11 and Figure 12. A problem with this design is that the magnets, which should be maintained at a low temperature, are in the hottest place.
It may be expected that a similar development of the efficiency would apply for a large permanent magnet generator. 7 Well Established or New Technology The permanent magnet machine is a newer technology than the induction machine, as an application as a wind turbine generator. 8 Gear or Direct Drive Multi-pole In general, because of the relatively large air-gap, the Permanent magnet Machine leakage flux remains below an acceptable limit for machines with many poles. This means that the machine can use the current flowing to generate torque.