Dear Joydeep,

For MW range, there is two competing topologies for wind energy (even for marine energy): DFIG and PMSG. The two technologies have there own advantages and drawbacks. In the attached two papers,I hope you can have some useful elements allowing you to make you choice.

Regards,

Mohamed

Dear Joydeep,

DFIG is the most common type of electrical generators in case of WsT in the 1-2 MW range (except in China) . The market share of PMSG, DFIG and SCIG is more diverse for higher rated powers.

You can find more details in our paper (especially in Figure 9):

https://www.researchgate.net/publication/295918972_Technological_evolution_of_onshore_wind_turbines-a_market-based_analysis

Best regards,

Javier

Article Technological evolution of onshore wind turbines—a market-ba...

Hi Joydeep,

This was discussed sometime back as replies to the question

DFIG or PMG in future ?

by Djalel Dib 

I suggest you look at the question and reply postings.

-Sanjay

Thank you for the feeds !

According to my study, manufacturing PMSG generators of large rating may incur huge cost of permanent magnets.

Any comments regarding this ?

Yes indeed but we have to balance these costs in the particular case of direct-drive application (remove the gearbox) with those of maintenance when using a DFIG!!

The state-of-the-art wind turbines have the so-called brushless variable speed motors, and gearless (no gearbox) generators. Less components means better reliability and performance by the wind turbines.

Hope this helps answer your question.

Professor Yehia Khalil

Yale University

USA

Hi Joydeep,

That's right! And that's why direct drive is not commonly used in very large wind  turbines  (especially in case of offshore installations) in favor of other configurations such as full converter + gearbox + PMSG or full converter + gearbox + SCIG. This way, even though the gearbox is needed, the cost of the permanent magnets, in case of PMSG, is lower (as the rotational speed of the generator is higher). The other option, using SCIG, has lower upfront costs but worse performance.