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This paper focuses on selection of wind turbine generation systems that include generators, converters and gears. We study Fig. 1): permanent magnet generator (PMG) system, doubly-fed generator (DFG) system and synchronous generator (SYG) system in terms of the system efficiencies and running costs. Figure 2 shows flow chart for estimation of system efficiency. The system efficiencies are calculated with considering mechanical loss, iron loss, copper loss, and stray loss of three types generator systems. Figure 3 shows comparison of electric power generation per year. These results are calculated with considering relation between wind power and wind condition. According to these results, the 1-step gear PMG system is the best choice to large wind turbine system.

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We have developed and tested a new shape of permanent magnet synchronous generator (PMG) rotor for a large scale wind turbine generator system. The new rotor structure has ventilation flues between poles that provide two advantages: (1) effective cooling of the permanent magnets, and (2) reduced eddy current loss.

No abstract