- a UM Power Energy Dedicated Advanced Centre (UMPEDAC), Level 4, Wisma R&D, University of Malaya, 59990 Kuala Lumpur, Malaysia
- b Faculty of Electrical Engineering, Universiti Teknologi MARA (UiTM), Masai, 81750 Johor, Malaysia
- Received 29 January 2015, Revised 31 January 2016, Accepted 6 September 2016, Available online 25 October 2016