1. Department of Electrical Engineering and Computer Science, Technical University of Berlin, Berlin, Germany
2. Department of Electrical--Electronics Engineering, Abdullah G\"{u}l University, Kayseri, Turkey
3. Department of Energy Systems Research, Ajou University, Suwon, South Korea
4. Department of Mechanical and Industrial Engineering, College of Engineering, Sultan Qaboos University, Al-Khoud, Muscat, Oman