[1] Tshwane Univ Technol, Dept Elect Engn, Pretoria, South Africa
[2] Univ Lagos, Dept Elect & Elect Engn, Lagos, Nigeria
[3] Royal HaskoningDHV, ZA-2191 Johannesburg, South Africa
[4] Bells Univ Technol, Dept Mech & Biomed Engn, Ota, Nigeria
[5] Covenant Univ, Dept Chem Engn, Ota, Nigeria