1. Department of Electrical Engineering Fundamentals, Faculty of Electrical Engineering, Wrocław University of Science and Technology, Wrocław, Poland
2. Department of Electrical Engineering, Chalmers University of Technology, Gothenburg, Sweden
3. Department of Applied Mathematics and Computer Science, Technical University of Denmark, Kongens Lyngby, Denmark
4. Department of Electrical Power Engineering, Faculty of Electrical Engineering and Computer Science, VSB—Technical University of Ostrava, Ostrava, Czech Republic