**Thanks**

The author would like to thank his Ph.D. study supervisors, Prof. Dr. Nicolaos A. Cutululis and Dr. Jayachandra N. Sakamuri, discussions with whom contributed significantly to this work. The author would also like to thank the Department of Wind Energy at the Technical University of Denmark (DTU) and Vattenfall Vindkraft A/S (Denmark) for hosting the author's Ph.D. study and start of his career in the renewable energy industry.
