1. Department of Electrical Power Engineering, Durban University of Technology, Durban 4001, South Africa
2. Department of Electrical and Electronic Engineering, Akwa Ibom State University, Mkpat Enin 524106, Nigeria
3. Department of Electrical, Electronic and Computer Engineering, Cape Peninsula University of Technology, Bellville 7535, South Africa
4. Department of Industrial Engineering, Durban University of Technology, Durban 4001, South Africa