It depends on the application/rating of the wind turbine. In the present wind turbine based power generation both DFIG & PMSG are widely used. In the recent years PMSG gets important for the reason that all the power conversion is transferred to the grid whereas, DFIG doesn't looks so. But in contrast the PMSG machines are costlier than that of DFIG.

As for PMSG:s concerns have been raised about the behavior of the permanent magnets over the lifetime of the generators. In addition, the rare earth elements (REE) employed in PMSG:s can be a problem since the supply of these elements is not large and limited in certain geographical areas. See, for example, [1] for a quantified assessment of the REE reserves.

[1] Jacobson, M.Z., Delucchi, M.A., Providing all global energy with wind, water, and solar power, Part I: Technologies,energy resources, quantities and areas of infrastructure, and materials. Energy Policy (2010), doi:10.1016/j.enpol.2010.11.040

Thank you for your answer but the problem of magnetization is not well resolved without forgetting the higher permanent magnet costs. China now is the monopole of PM material.

Dear,

I think its relative!

its a function of wind speed, power, costs, ...

Your are welcome

for low power applications The MSAP is bettre than the DFIG. and for high power application the MADA is better than the PMSG.

Actually, new trends are going to BDFIG for high power application,. since it does not need a brush.

I think it is better to use DFIG for large scale WT and PMSG for small and medium size WT.

I prefer PMSG. I think they are more reliable.

new trends are going to BDFIG for large scale wind turbine. it show commercial promise for wind-power generation due to their lower capital and operational costs and higher reliability as compared with doubly fed induction generators.

for more information try to read the following article

http://ieeexplore.ieee.org/xpl/login.jsp?tp=&arnumber=5071226&url=http%3A%2F%2Fieeexplore.ieee.org%2Fiel5%2F41%2F5238769%2F05071226.pdf%3Farnumber%3D5071226

and

http://www.windtechnologies.com/Wind/Wind-Technologies/News/13/Wind-Technologies-presents-at-EWEA-2013.aspx

I'd have to say that as a matter of principle, it depends on size, cost, availability, etc. Practically, DFIG is what we've worked with in our applications, PMSG has not really been an option.