1. Department of Electrical Power Systems, Kaunas University of Technology, K. Donelaičio g. 73, LT-44249 Kaunas, Lithuania
2. Laboratory of Energy Systems Research, Lithuanian Energy Institute, Breslaujos str. 3, LT-44403 Kaunas, Lithuania
3. DTU Wind and Energy Systems, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark
4. Faculty of Mechanical, Aerospace and Civil Engineering, University of Manchester, Oxford Rd, Manchester M13 9PL, UK