Electrolytic Capacitor-less Inverter driven Induction Motor with V/f Control for Use in Water Pumping Applications

Electrolytic capacitor-less inverters have potential advantage in terms of increased lifetime, higher power density and less amount of energy loss. In this work, the application of such a converter for a 2.2kW induction motor driven water pumping system is proposed. The six-pulse dc bus is under closed loop control. The dc bus is varied along with the adjustment in synchronous one leg modulation (SOLM) technique for wide frequency range to obtain V/f control of the induction motor. Theoretical analysis and simulation results are presented.