Thank a lot 

Dear A.T. Elsayed 

I will do it and refer back to you

Dear Mona Bayoumi,

In the Matlab, there is a established model and u can learn that from that model. U can search that by DFIG model and VSC-HVDC model. I think the version should be above 2012b. Thanks.

Hello,

I recommend you study the following worthwhile paper. It gives you some hints to devise a mathematical model for your problem.

"Information Gap Decision Theory based OPF with HVDC Connected Wind Farms"

by Abbas Rabiee, Alireza Soroudi, Andrew Keane

Good luck,

Morteza Shabanzadeh

http://mortezash.blogfa.com/

The following article may be helpful in the main topic you mentioned.

Preprint Sizing and Operational Loading of Reactive Power Compensator...