keywords AC-DC power convertors COMBINED COST MAP DC motors EFFICIENCY ELECTRIC VEHICLE Engineering Engineering, Electrical & Electronic OPTIMIZATION SHEV performance SHEVs SYSTEM Science & Technology Technology Transportation Transportation Science & Technology ZEBRA battery system auxiliary power source battery dynamics battery utilisation electrical output hybrid electric vehicles hybrid permanent magnet generator internal combustion engine internal combustion engines laboratory prototype HPM generator system optimised auxiliary power unit permanent magnet generators power transmission (mechanical) prime mover range extension series hybrid EV powertrain series hybrid electric vehicles vehicle DC-link vehicle primary energy vehicle range